From e83e5517f3535b51ad56479e9f5d740b6a3ece21 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 00:58:54 +0100
Subject: [PATCH 01/10] add cirrus-ci docker support

---
 .cirrus.yml                                 | 203 ++++++++++-------
 requirements/ci/nox.lock/Dockerfile         |  36 +++
 requirements/ci/nox.lock/py36-linux-64.lock | 240 ++++++++++++++++++++
 requirements/ci/nox.lock/py37-linux-64.lock | 237 +++++++++++++++++++
 requirements/ci/nox.lock/py38-linux-64.lock | 235 +++++++++++++++++++
 5 files changed, 863 insertions(+), 88 deletions(-)
 create mode 100644 requirements/ci/nox.lock/Dockerfile
 create mode 100644 requirements/ci/nox.lock/py36-linux-64.lock
 create mode 100644 requirements/ci/nox.lock/py37-linux-64.lock
 create mode 100644 requirements/ci/nox.lock/py38-linux-64.lock

diff --git a/.cirrus.yml b/.cirrus.yml
index 13e95f7397..d6fd0baac7 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -19,12 +19,12 @@ container:
 
 env:
   # Skip specific tasks by name. Set to a non-empty string to skip.
-  SKIP_LINT_TASK: ""
+  SKIP_LINT_TASK: "x"
   SKIP_TEST_MINIMAL_TASK: ""
-  SKIP_TEST_FULL_TASK: ""
-  SKIP_GALLERY_TASK: ""
-  SKIP_DOCTEST_TASK: ""
-  SKIP_LINKCHECK_TASK: ""
+  SKIP_TEST_FULL_TASK: "x"
+  SKIP_GALLERY_TASK: "x"
+  SKIP_DOCTEST_TASK: "x"
+  SKIP_LINKCHECK_TASK: "x"
   # Skip task groups by type. Set to a non-empty string to skip.
   SKIP_ALL_TEST_TASKS: ""
   SKIP_ALL_DOC_TASKS: ""
@@ -32,14 +32,6 @@ env:
   CACHE_PERIOD: "2"
   # Increment the build number to force new cartopy cache upload.
   CARTOPY_CACHE_BUILD: "0"
-  # Increment the build number to force new conda cache upload.
-  CONDA_CACHE_BUILD: "0"
-  # Increment the build number to force new nox cache upload.
-  NOX_CACHE_BUILD: "0"
-  # Increment the build number to force new pip cache upload.
-  PIP_CACHE_BUILD: "0"
-  # Pip package to be upgraded/installed.
-  PIP_CACHE_PACKAGES: "pip setuptools wheel nox"
   # Git commit hash for iris test data.
   IRIS_TEST_DATA_REF: "fffb9b14b9cb472c5eb2ebb7fd19acb7f6414a30"
   # Base directory for the iris-test-data.
@@ -47,38 +39,36 @@ env:
 
 
 #
-# YAML alias for common linux test infra-structure.
+# YAML alias for common linux test infra-structure
 #
 linux_task_template: &LINUX_TASK_TEMPLATE
   auto_cancellation: true
   env:
-    IRIS_REPO_DIR: ${CIRRUS_WORKING_DIR}
-    PATH: ${HOME}/miniconda/bin:${PATH}
     SITE_CFG: ${CIRRUS_WORKING_DIR}/lib/iris/etc/site.cfg
-  conda_cache:
-    folder: ${HOME}/miniconda
-    fingerprint_script:
-      - wget --quiet https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh
-      - echo "${CIRRUS_OS} $(sha256sum miniconda.sh)"
-      - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${CONDA_CACHE_BUILD}"
-    populate_script:
-      - bash miniconda.sh -b -p ${HOME}/miniconda
-      - conda config --set always_yes yes --set changeps1 no
-      - conda config --set show_channel_urls True
-      - conda config --add channels conda-forge
-      - conda update --quiet --name base conda
-      - conda install --quiet --name base nox pip
   cartopy_cache:
     folder: ${HOME}/.local/share/cartopy
     fingerprint_script:
       - echo "${CIRRUS_OS}"
       - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${CARTOPY_CACHE_BUILD}"
-  nox_cache:
-    folder: ${CIRRUS_WORKING_DIR}/.nox
-    fingerprint_script:
-      - echo "${CIRRUS_TASK_NAME}"
-      - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${NOX_CACHE_BUILD}"
-      - sha256sum ${CIRRUS_WORKING_DIR}/requirements/ci/py$(echo ${PY_VER} | tr -d ".").yml
+
+
+#
+# YAML alias for common docker build infra-structure
+#
+docker_template: &DOCKER_TEMPLATE
+  env:
+    DOCKER_USERNAME: "ENCRYPTED\
+                      [a5ba7e105e04f79ce57c408f280d92c8c9c094ca0b1723d2\
+                      3850f8282be48041c0012a8e2efaa6e2f11a297c3bdc0b4a]"
+    DOCKER_PASSWORD: "ENCRYPTED\
+                      [549d20937f4c8862bea2e48312f8a68635474bf5593c959b\
+                      25ae7b6c86dbdcdb4e54045b9e2a3876fc5dde0cc251ad0a]"
+  build_script:
+    - docker image pull bjlittle/cirrus-ci-py${PY_VER}:latest || true
+    - docker build --cache-from bjlittle/cirrus-ci-py${PY_VER}:latest --build-arg PY_VER=${PY_VER} --tag bjlittle/cirrus-ci-py${PY_VER} requirements/ci/nox.lock/.
+    - docker tag bjlittle/cirrus-ci-py${PY_VER} bjlittle/cirrus-ci-py${PY_VER}:${CIRRUS_BUILD_ID}
+    - echo ${DOCKER_PASSWORD} | docker login --username ${DOCKER_USERNAME} --password-stdin
+    - docker push bjlittle/cirrus-ci-py${PY_VER}
 
 
 #
@@ -88,23 +78,45 @@ compute_credits_template: &CREDITS_TEMPLATE
   # Only use credits for non-DRAFT pull-requests to SciTools/iris master branch by collaborators
   use_compute_credits: $CIRRUS_REPO_FULL_NAME == 'SciTools/iris' && $CIRRUS_USER_COLLABORATOR == 'true' && $CIRRUS_PR_DRAFT == 'false' && $CIRRUS_BASE_BRANCH == 'master' && $CIRRUS_PR != ''
 
+
+#
+# Docker
+#
+docker_builder:
+  alias: builder-py36
+  env:
+    PY_VER: 36
+  name: "${CIRRUS_OS}: py${PY_VER} docker builder"
+  << : *DOCKER_TEMPLATE
+
+
+docker_builder:
+  alias: builder-py37
+  env:
+    PY_VER: 37
+  name: "${CIRRUS_OS}: py${PY_VER} docker builder"
+  << : *DOCKER_TEMPLATE
+
+
+docker_builder:
+  alias: builder-py38
+  env:
+    PY_VER: 38
+  name: "${CIRRUS_OS}: py${PY_VER} docker builder"
+  << : *DOCKER_TEMPLATE
+
+
 #
 # Linting
 #
 lint_task:
+  name: "${CIRRUS_OS}: flake8 and black"
   only_if: $SKIP_LINT_TASK == ""
-  << : *CREDITS_TEMPLATE
+  depends_on:
+    - builder-py38
   auto_cancellation: true
-  name: "${CIRRUS_OS}: flake8 and black"
-  pip_cache:
-    folder: ~/.cache/pip
-    fingerprint_script:
-      - echo "${CIRRUS_TASK_NAME}"
-      - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${PIP_CACHE_BUILD} ${PIP_CACHE_PACKAGES}"
+  << : *CREDITS_TEMPLATE
   lint_script:
-    - pip list
-    - python -m pip install --retries 3 --upgrade ${PIP_CACHE_PACKAGES}
-    - pip list
     - nox --session flake8
     - nox --session black
 
@@ -116,17 +128,31 @@ test_minimal_task:
   only_if: $SKIP_TEST_MINIMAL_TASK == "" && $SKIP_ALL_TEST_TASKS == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    env:
-      PY_VER: 3.6
-    env:
-      PY_VER: 3.7
-    env:
-      PY_VER: 3.8
+    - depends_on:
+        builder-py36
+      env:
+        PY_VER: 3.6
+      container:
+        image: scitools/cirrus-ci-py36:latest
+        cpu: 2
+        memory: 4G
+    - depends_on:
+        builder-py37
+      env:
+        PY_VER: 3.7
+      container:
+        image: scitools/cirrus-ci-py37:latest
+        cpu: 2
+        memory: 4G
+    - depends_on:
+        builder-py38
+      env:
+        PY_VER: 3.8
+      container:
+        image: scitools/cirrus-ci-py38:latest
+        cpu: 2
+        memory: 4G
   name: "${CIRRUS_OS}: py${PY_VER} tests (minimal)"
-  container:
-    image: gcc:latest
-    cpu: 2
-    memory: 4G
   << : *LINUX_TASK_TEMPLATE
   tests_script:
     - echo "[Resources]" > ${SITE_CFG}
@@ -141,17 +167,29 @@ test_full_task:
   only_if: $SKIP_TEST_FULL_TASK == "" && $SKIP_ALL_TEST_TASKS == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    env:
-      PY_VER: 3.6
-    env:
-      PY_VER: 3.7
-    env:
-      PY_VER: 3.8
+    - depends_on:
+        builder-py36
+      env:
+        PY_VER: 3.6
+      container:
+        image: scitools/cirrus-ci-py36:latest
+        cpu: 6
+        memory: 8G
+    - depends_on:
+        builder-py37
+      env:
+        PY_VER: 3.7
+      container:
+        image: scitools/cirrus-ci-py37:latest
+    - depends_on:
+        builder-py38
+      env:
+        PY_VER: 3.8
+      container:
+        image: scitools/cirrus-ci-py38:latest
+        cpu: 6
+        memory: 8G
   name: "${CIRRUS_OS}: py${PY_VER} tests (full)"
-  container:
-    image: gcc:latest
-    cpu: 6
-    memory: 8G
   data_cache:
     folder: ${IRIS_TEST_DATA_DIR}
     fingerprint_script:
@@ -173,15 +211,12 @@ test_full_task:
 #
 gallery_task:
   only_if: $SKIP_GALLERY_TASK == "" && $SKIP_ALL_DOC_TASKS == ""
+  depends_on:
+    - builder-py38
   << : *CREDITS_TEMPLATE
-  matrix:
-    env:
-      PY_VER: 3.8
+  env:
+    PY_VER: 3.8
   name: "${CIRRUS_OS}: py${PY_VER} doc tests (gallery)"
-  container:
-    image: gcc:latest
-    cpu: 2
-    memory: 4G
   data_cache:
     folder: ${IRIS_TEST_DATA_DIR}
     fingerprint_script:
@@ -203,18 +238,14 @@ gallery_task:
 #
 doctest_task:
   only_if: $SKIP_DOCTEST_TASK == "" && $SKIP_ALL_DOC_TASKS == ""
+  depends_on:
+    - builder-py38
   << : *CREDITS_TEMPLATE
-  matrix:
-    env:
-      PY_VER: 3.8
-  name: "${CIRRUS_OS}: py${PY_VER} doc tests"
-  container:
-    image: gcc:latest
-    cpu: 2
-    memory: 4G
   env:
+    PY_VER: 3.8
     MPL_RC_DIR: ${HOME}/.config/matplotlib
     MPL_RC_FILE: ${HOME}/.config/matplotlib/matplotlibrc
+  name: "${CIRRUS_OS}: py${PY_VER} doc tests"
   data_cache:
     folder: ${IRIS_TEST_DATA_DIR}
     fingerprint_script:
@@ -239,18 +270,14 @@ doctest_task:
 #
 linkcheck_task:
   only_if: $SKIP_LINKCHECK_TASK == "" && $SKIP_ALL_DOC_TASKS == ""
+  depends_on:
+    - builder-py38
   << : *CREDITS_TEMPLATE
-  matrix:
-    env:
-      PY_VER: 3.8
-  name: "${CIRRUS_OS}: py${PY_VER} doc link check"
-  container:
-    image: gcc:latest
-    cpu: 2
-    memory: 4G
   env:
+    PY_VER: 3.8
     MPL_RC_DIR: ${HOME}/.config/matplotlib
     MPL_RC_FILE: ${HOME}/.config/matplotlib/matplotlibrc
+  name: "${CIRRUS_OS}: py${PY_VER} doc link check"
   << : *LINUX_TASK_TEMPLATE
   tests_script:
     - mkdir -p ${MPL_RC_DIR}
diff --git a/requirements/ci/nox.lock/Dockerfile b/requirements/ci/nox.lock/Dockerfile
new file mode 100644
index 0000000000..4930fca3ff
--- /dev/null
+++ b/requirements/ci/nox.lock/Dockerfile
@@ -0,0 +1,36 @@
+FROM condaforge/mambaforge:latest
+
+LABEL author="scitools" \
+      version="0.1" \
+      description="SciTools Cirrus-CI mambaforge image"
+
+# python version in "<major><minor>" format e.g., "38"
+ARG PY_VER
+
+ENV WORK_DIR="/root/scitools" \
+    LOCK_FILE="/root/scitools/iris.lock" \
+    NOX_DIR="/root/scitools/.nox" \
+    ENV_DIR="/root/scitools/.nox/tests" \
+    TMP_DIR="/root/scitools/.nox/tests/tmp"
+
+# configure conda and install conda-lock et al
+RUN conda config --set always_yes yes \
+  && conda config --set changeps1 no \
+  && conda config --set show_channel_urls True \
+  && conda config --add channels conda-forge \
+  && conda update --quiet --name base conda \
+  && mamba install --yes --quiet --channel conda-forge --name base conda-lock nox pip setuptools wheel
+
+# populate work directory with lock file from docker context
+WORKDIR ${WORK_DIR}
+COPY ./py${PY_VER}-linux-64.lock ${LOCK_FILE}
+
+# install the lock packages into the nox workspace and
+# configure the required nox environments
+RUN mkdir -p ${ENV_DIR} \
+  && mamba install --prefix ${ENV_DIR} --file ${LOCK_FILE} \
+  && ln -s ${ENV_DIR} ${NOX_DIR}/gallery \
+  && ln -s ${ENV_DIR} ${NOX_DIR}/doctest \
+  && ln -s ${ENV_DIR} ${NOX_DIR}/linkcheck \
+  && mkdir -p ${TMP_DIR} \
+  && sha256sum ${LOCK_FILE} | cut -d' ' -f1 > ${TMP_DIR}/py${PY_VER}.yml
diff --git a/requirements/ci/nox.lock/py36-linux-64.lock b/requirements/ci/nox.lock/py36-linux-64.lock
new file mode 100644
index 0000000000..4e8635d406
--- /dev/null
+++ b/requirements/ci/nox.lock/py36-linux-64.lock
@@ -0,0 +1,240 @@
+# platform: linux-64
+# env_hash: 051c6f392a22765597fba32aa02d4d74ab5b9ecfa08a6954ad87bff2d3a249ba
+@EXPLICIT
+https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2020.12.5-ha878542_0.tar.bz2#7eb5d4ffeee663caa1635cd67071bc1b
+https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2#0c96522c6bdaed4b1566d11387caaf45
+https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-3.000-h77eed37_0.tar.bz2#34893075a5c9e55cdafac56607368fc6
+https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.038-h77eed37_0.tar.bz2#4d59c254e01d9cde7957100457e2d5fb
+https://conda.anaconda.org/conda-forge/noarch/font-ttf-ubuntu-0.83-hab24e00_0.tar.bz2#19410c3df09dfb12d1206132a1d357c5
+https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.35.1-hea4e1c9_2.tar.bz2#83610dba766a186bdc7a116053b782a4
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-9.3.0-hff62375_19.tar.bz2#c2d8da3cb171e4aa642d20c6e4e42a04
+https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-9.3.0-h6de172a_19.tar.bz2#cd9a24a8dde03ec0cf0e603b0bea85a1
+https://conda.anaconda.org/conda-forge/linux-64/mpi-1.0-mpich.tar.bz2#c1fcff3417b5a22bbc4cf6e8c23648cf
+https://conda.anaconda.org/conda-forge/linux-64/mysql-common-8.0.23-ha770c72_2.tar.bz2#ce876d0c998e1e2eb1dc67b01937737f
+https://conda.anaconda.org/conda-forge/noarch/fonts-conda-forge-1-0.tar.bz2#f766549260d6815b0c52253f1fb1bb29
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran-ng-9.3.0-hff62375_19.tar.bz2#aea379bd68fdcdf9499fa1453f852ac1
+https://conda.anaconda.org/conda-forge/linux-64/libgomp-9.3.0-h2828fa1_19.tar.bz2#ab0a307912033126da02507b59e79ec9
+https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-1_gnu.tar.bz2#561e277319a41d4f24f5c05a9ef63c04
+https://conda.anaconda.org/conda-forge/noarch/fonts-conda-ecosystem-1-0.tar.bz2#fee5683a3f04bd15cbd8318b096a27ab
+https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.bz2#9d5cdfc51476ee4dcdd96ed2dca3f943
+https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz2#1378b88874f42ac31b2f8e4f6975cb7b
+https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
+https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.1-h7f98852_1.tar.bz2#ed1dc233ed5e3eaa9bfbaac64d130c5e
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.3.0-h9c3ff4c_0.tar.bz2#1fb8f0254eb78a2a0c120155e1b1a207
+https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h516909a_0.tar.bz2#bdc16c2b8852914fdbadb8e4d6361a8b
+https://conda.anaconda.org/conda-forge/linux-64/geos-3.9.1-h9c3ff4c_2.tar.bz2#b9a6d9422aed3ad84ec6ccee9bfcaa0f
+https://conda.anaconda.org/conda-forge/linux-64/giflib-5.2.1-h516909a_2.tar.bz2#70d777f83639cc2c05334b59a6dc9159
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+https://conda.anaconda.org/conda-forge/linux-64/icu-68.1-h58526e2_0.tar.bz2#fc7a4271dc2a7f4fd78cd63695baf7c3
+https://conda.anaconda.org/conda-forge/linux-64/jpeg-9d-h516909a_0.tar.bz2#aa82d2e6e1fa196bf4addd7ebc71a807
+https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-h516909a_1.tar.bz2#6f8720dff19e17ce5d48cfe7f3d2f0a3
+https://conda.anaconda.org/conda-forge/linux-64/libffi-3.3-h58526e2_2.tar.bz2#665369991d8dd290ac5ee92fce3e6bf5
+https://conda.anaconda.org/conda-forge/linux-64/libiconv-1.16-h516909a_0.tar.bz2#5c0f338a513a2943c659ae619fca9211
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+https://conda.anaconda.org/conda-forge/linux-64/libogg-1.3.4-h7f98852_1.tar.bz2#6e8cc2173440d77708196c5b93771680
+https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.15-pthreads_h8fe5266_1.tar.bz2#bb5527a16584426a897f22643d9a36a6
+https://conda.anaconda.org/conda-forge/linux-64/libopus-1.3.1-h7f98852_1.tar.bz2#15345e56d527b330e1cacbdf58676e8f
+https://conda.anaconda.org/conda-forge/linux-64/libtool-2.4.6-h58526e2_1007.tar.bz2#7f6569a0c2f27acb8fc90600b382e544
+https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.32.1-h14c3975_1000.tar.bz2#39c6326f6ee5297632c47db6520546fe
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+https://conda.anaconda.org/conda-forge/linux-64/lz4-c-1.9.3-h9c3ff4c_0.tar.bz2#4eb64ee0d5cd43096ffcf843c76b05d4
+https://conda.anaconda.org/conda-forge/linux-64/mpich-3.4.1-h846660c_104.tar.bz2#94f01e56905a7af1479c9f72b00e9864
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2#509f2a21c4a09214cd737a480dfd80c9
+https://conda.anaconda.org/conda-forge/linux-64/nspr-4.30-h9c3ff4c_0.tar.bz2#e6dc1f8f6e0bcebe8e3d8a5bca258dbe
+https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1k-h7f98852_0.tar.bz2#07fae2cb088379c8441e0f3ffa1f4025
+https://conda.anaconda.org/conda-forge/linux-64/pcre-8.44-he1b5a44_0.tar.bz2#e647d89cd5cdf62760cf283a001841ff
+https://conda.anaconda.org/conda-forge/linux-64/pixman-0.40.0-h36c2ea0_0.tar.bz2#660e72c82f2e75a6b3fe6a6e75c79f19
+https://conda.anaconda.org/conda-forge/linux-64/pthread-stubs-0.4-h36c2ea0_1001.tar.bz2#22dad4df6e8630e8dff2428f6f6a7036
+https://conda.anaconda.org/conda-forge/linux-64/xorg-kbproto-1.0.7-h14c3975_1002.tar.bz2#6dfe5dbe10d55266e4a5e89287eed578
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diff --git a/requirements/ci/nox.lock/py37-linux-64.lock b/requirements/ci/nox.lock/py37-linux-64.lock
new file mode 100644
index 0000000000..0388bfc706
--- /dev/null
+++ b/requirements/ci/nox.lock/py37-linux-64.lock
@@ -0,0 +1,237 @@
+# platform: linux-64
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+@EXPLICIT
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diff --git a/requirements/ci/nox.lock/py38-linux-64.lock b/requirements/ci/nox.lock/py38-linux-64.lock
new file mode 100644
index 0000000000..bd4c8c7c1b
--- /dev/null
+++ b/requirements/ci/nox.lock/py38-linux-64.lock
@@ -0,0 +1,235 @@
+# platform: linux-64
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+https://conda.anaconda.org/conda-forge/linux-64/editdistance-s-1.0.0-py38h1fd1430_1.tar.bz2#03bbd69539712a691b0a43bd4a49976e
+https://conda.anaconda.org/conda-forge/noarch/jinja2-3.0.1-pyhd8ed1ab_0.tar.bz2#c647e77921fd3e245cdcc5b2d451a0f8
+https://conda.anaconda.org/conda-forge/linux-64/mo_pack-0.2.0-py38hab2c0dc_1005.tar.bz2#542dc4b30b6fcd90ee26e97486ced260
+https://conda.anaconda.org/conda-forge/linux-64/netcdf-fortran-4.5.3-mpi_mpich_h196b126_4.tar.bz2#e058f42a78ea8c965cf7335e28143c59
+https://conda.anaconda.org/conda-forge/linux-64/pandas-1.2.4-py38h1abd341_0.tar.bz2#91150ede50b13d34a03e9ef51b7b379f
+https://conda.anaconda.org/conda-forge/linux-64/pango-1.48.5-hb8ff022_0.tar.bz2#f4e263c4dfa15b6a97349782793d1ee7
+https://conda.anaconda.org/conda-forge/linux-64/python-stratify-0.2.post0-py38hb5d20a5_0.tar.bz2#cc6852249c01884469560082943b689f
+https://conda.anaconda.org/conda-forge/linux-64/pywavelets-1.1.1-py38hab2c0dc_3.tar.bz2#724fc3dd52d3f9a2219f88aac3c0cd51
+https://conda.anaconda.org/conda-forge/linux-64/qt-5.12.9-hda022c4_4.tar.bz2#afebab1f5049d66baaaec67d9ce893f0
+https://conda.anaconda.org/conda-forge/linux-64/scipy-1.6.3-py38h7b17777_0.tar.bz2#8055079ed82e1ada1cc4714c26d04802
+https://conda.anaconda.org/conda-forge/linux-64/setuptools-49.6.0-py38h578d9bd_3.tar.bz2#59c561cd1be0db9cf1c83f7d7cc74f4d
+https://conda.anaconda.org/conda-forge/linux-64/shapely-1.7.1-py38haeee4fe_4.tar.bz2#b94adbb3ce5a62a6894d7757005e6ad8
+https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-napoleon-0.7-py_0.tar.bz2#0bc25ff6f2e34af63ded59692df5f749
+https://conda.anaconda.org/conda-forge/linux-64/asv-0.4.2-py38h709712a_2.tar.bz2#4659f315fc42e671606fbcd1b9234f75
+https://conda.anaconda.org/conda-forge/linux-64/bokeh-2.1.1-py38h32f6830_0.tar.bz2#896f192315a5a04c878febacd67e64cd
+https://conda.anaconda.org/conda-forge/linux-64/cf-units-2.1.5-py38hb5d20a5_0.tar.bz2#b45764dbfe02c18f80458bb241e37955
+https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.5.0-py38h578d9bd_0.tar.bz2#4f32bf3fe6ff875d0afbaab19f3da3e9
+https://conda.anaconda.org/conda-forge/linux-64/esmf-8.1.1-mpi_mpich_h3dcaa78_100.tar.bz2#5b4bab1017226f2c03ba0fe02b783316
+https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.2-pyhd8ed1ab_0.tar.bz2#37d685abea0a25c921431edda02ad143
+https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-h539f30e_1.tar.bz2#606777b4da3664d5c9415f5f165349fd
+https://conda.anaconda.org/conda-forge/noarch/identify-2.2.5-pyhd8ed1ab_0.tar.bz2#21f587a49bb0d8036951149354f2537d
+https://conda.anaconda.org/conda-forge/noarch/imagehash-4.2.0-pyhd8ed1ab_0.tar.bz2#e5a77472ae964f2835fce16355bbfe64
+https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.5-hc3c00ef_0.tar.bz2#1362366116e80bcfbe9c7cd99766ea40
+https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.4.2-py38hcc49a3a_0.tar.bz2#4bfb6818a1fce6d4129fdf121f788505
+https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.6-nompi_py38h5e9db54_103.tar.bz2#72a5656daeee23c80e22b936bef0ceb3
+https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.6.0-pyhd8ed1ab_0.tar.bz2#0941325bf48969e2b3b19d0951740950
+https://conda.anaconda.org/conda-forge/linux-64/nose-1.3.7-py38h32f6830_1004.tar.bz2#c3f4d188368c26f373930da0171be824
+https://conda.anaconda.org/conda-forge/noarch/pygments-2.9.0-pyhd8ed1ab_0.tar.bz2#a2d9bba43c9b80a42b0ccb9afd7223c2
+https://conda.anaconda.org/conda-forge/noarch/pyopenssl-20.0.1-pyhd8ed1ab_0.tar.bz2#92371c25994d0f5d28a01c1fb75ebf86
+https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py38h7400c14_7.tar.bz2#8fe28c949b01e3d69c2b357b5abf3916
+https://conda.anaconda.org/conda-forge/linux-64/cartopy-0.19.0.post1-py38hc9c980b_0.tar.bz2#65e97172e139d3465895eb07a1fd52f2
+https://conda.anaconda.org/conda-forge/noarch/dask-2021.5.0-pyhd8ed1ab_0.tar.bz2#dd5bcdcdc6c1f94f2a62c15fc6da65a3
+https://conda.anaconda.org/conda-forge/linux-64/esmpy-8.1.1-mpi_mpich_py38h7f78e9f_100.tar.bz2#ce0ac0d6f5e6c5e7e0c613b08b3a0960
+https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.47.1-h85b4f2f_1.tar.bz2#4b7c5657eac8ddfa0cae06f6f9a2a275
+https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.2.0-py_1.tar.bz2#f3158a5d335f0f44f09cf05d3fb4107e
+https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.12.1-py38h578d9bd_0.tar.bz2#c26dbf85b3b8699f6a551e1f63bf9580
+https://conda.anaconda.org/conda-forge/linux-64/pyqtchart-5.12-py38h7400c14_7.tar.bz2#3003444b4f41742a33b7afdeb3260cbc
+https://conda.anaconda.org/conda-forge/linux-64/pyqtwebengine-5.12.1-py38h7400c14_7.tar.bz2#1c17944e118b314ff4d0bfc05f03a5e1
+https://conda.anaconda.org/conda-forge/noarch/pyugrid-0.3.1-py_2.tar.bz2#7d7361886fbcf2be663fd185bf6d244d
+https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.4-pyhd8ed1ab_0.tar.bz2#d7b20b328e23d993994ea02077c009c0
+https://conda.anaconda.org/conda-forge/linux-64/pyqt-5.12.3-py38h578d9bd_7.tar.bz2#7166890c160d0441f59973a40b74f6e5
+https://conda.anaconda.org/conda-forge/noarch/requests-2.25.1-pyhd3deb0d_0.tar.bz2#ae687aba31a1c400192a86a2e993ffdc
+https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.4.2-py38h578d9bd_0.tar.bz2#82aa0479b2189ab97f9e70b90d7ec866
+https://conda.anaconda.org/conda-forge/noarch/sphinx-3.5.4-pyh44b312d_0.tar.bz2#0ebc444f001f73c4f6de01057b0be392
+https://conda.anaconda.org/conda-forge/noarch/sphinx-copybutton-0.3.1-pyhd8ed1ab_0.tar.bz2#decad13214a2a545944560eccf4a9815
+https://conda.anaconda.org/conda-forge/noarch/sphinx-gallery-0.9.0-pyhd8ed1ab_0.tar.bz2#5ef222a3e1b5904742e376e05046692b
+https://conda.anaconda.org/conda-forge/noarch/sphinx-panels-0.5.2-pyhd3deb0d_0.tar.bz2#1a871a63c4be1bd47a7aa48b7417a426
+https://conda.anaconda.org/conda-forge/noarch/sphinx_rtd_theme-0.5.2-pyhd8ed1ab_1.tar.bz2#7434e891fc767cb0d39d90751720c8ec

From 13d8c020f87a7ad6a93b6ae56a5cdf2ab5ed8856 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 01:13:37 +0100
Subject: [PATCH 02/10] wip

---
 .cirrus.yml | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index d6fd0baac7..e07a0b34b7 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -133,7 +133,7 @@ test_minimal_task:
       env:
         PY_VER: 3.6
       container:
-        image: scitools/cirrus-ci-py36:latest
+        image: bjlittle/cirrus-ci-py36:latest
         cpu: 2
         memory: 4G
     - depends_on:
@@ -141,7 +141,7 @@ test_minimal_task:
       env:
         PY_VER: 3.7
       container:
-        image: scitools/cirrus-ci-py37:latest
+        image: bjlittle/cirrus-ci-py37:latest
         cpu: 2
         memory: 4G
     - depends_on:
@@ -149,7 +149,7 @@ test_minimal_task:
       env:
         PY_VER: 3.8
       container:
-        image: scitools/cirrus-ci-py38:latest
+        image: bjlittle/cirrus-ci-py38:latest
         cpu: 2
         memory: 4G
   name: "${CIRRUS_OS}: py${PY_VER} tests (minimal)"
@@ -172,7 +172,7 @@ test_full_task:
       env:
         PY_VER: 3.6
       container:
-        image: scitools/cirrus-ci-py36:latest
+        image: bjlittle/cirrus-ci-py36:latest
         cpu: 6
         memory: 8G
     - depends_on:
@@ -180,13 +180,13 @@ test_full_task:
       env:
         PY_VER: 3.7
       container:
-        image: scitools/cirrus-ci-py37:latest
+        image: bjlittle/cirrus-ci-py37:latest
     - depends_on:
         builder-py38
       env:
         PY_VER: 3.8
       container:
-        image: scitools/cirrus-ci-py38:latest
+        image: bjlittle/cirrus-ci-py38:latest
         cpu: 6
         memory: 8G
   name: "${CIRRUS_OS}: py${PY_VER} tests (full)"

From b71345145be2f571397c67baad147e12a8f38c95 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 01:23:26 +0100
Subject: [PATCH 03/10] wip

---
 .cirrus.yml                         | 2 ++
 requirements/ci/nox.lock/Dockerfile | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index e07a0b34b7..c373de52e3 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -200,6 +200,8 @@ test_full_task:
       - mv iris-test-data-$(echo "${IRIS_TEST_DATA_REF}" | sed "s/^v//") ${IRIS_TEST_DATA_DIR}
   << : *LINUX_TASK_TEMPLATE
   tests_script:
+    - echo ${PWD} >&2
+    - ls -l >&2
     - echo "[Resources]" > ${SITE_CFG}
     - echo "test_data_dir = ${IRIS_TEST_DATA_DIR}/test_data" >> ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
diff --git a/requirements/ci/nox.lock/Dockerfile b/requirements/ci/nox.lock/Dockerfile
index 4930fca3ff..a989859356 100644
--- a/requirements/ci/nox.lock/Dockerfile
+++ b/requirements/ci/nox.lock/Dockerfile
@@ -28,7 +28,7 @@ COPY ./py${PY_VER}-linux-64.lock ${LOCK_FILE}
 # install the lock packages into the nox workspace and
 # configure the required nox environments
 RUN mkdir -p ${ENV_DIR} \
-  && mamba install --prefix ${ENV_DIR} --file ${LOCK_FILE} \
+  && mamba install --quiet --prefix ${ENV_DIR} --file ${LOCK_FILE} \
   && ln -s ${ENV_DIR} ${NOX_DIR}/gallery \
   && ln -s ${ENV_DIR} ${NOX_DIR}/doctest \
   && ln -s ${ENV_DIR} ${NOX_DIR}/linkcheck \

From db58d9a91afa8e87d8f0cd08ff9d3be384eef8a2 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 01:36:42 +0100
Subject: [PATCH 04/10] wip

---
 .cirrus.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index c373de52e3..b37505dd4a 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -155,6 +155,8 @@ test_minimal_task:
   name: "${CIRRUS_OS}: py${PY_VER} tests (minimal)"
   << : *LINUX_TASK_TEMPLATE
   tests_script:
+    - echo "PWD = <${PWD}>" >&2
+    - ls -l >&2
     - echo "[Resources]" > ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
     - nox --session tests
@@ -200,8 +202,6 @@ test_full_task:
       - mv iris-test-data-$(echo "${IRIS_TEST_DATA_REF}" | sed "s/^v//") ${IRIS_TEST_DATA_DIR}
   << : *LINUX_TASK_TEMPLATE
   tests_script:
-    - echo ${PWD} >&2
-    - ls -l >&2
     - echo "[Resources]" > ${SITE_CFG}
     - echo "test_data_dir = ${IRIS_TEST_DATA_DIR}/test_data" >> ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}

From 55f30aac9e56e3c268e36b048a4b2bdb40cc299b Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 01:43:44 +0100
Subject: [PATCH 05/10] wip

---
 .cirrus.yml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index b37505dd4a..f36e444414 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -155,8 +155,7 @@ test_minimal_task:
   name: "${CIRRUS_OS}: py${PY_VER} tests (minimal)"
   << : *LINUX_TASK_TEMPLATE
   tests_script:
-    - echo "PWD = <${PWD}>" >&2
-    - ls -l >&2
+    - ln -s /root/scitools/.nox .nox
     - echo "[Resources]" > ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
     - nox --session tests

From e8bd3ad9e854806f3ea764c85d5fcd949ad51507 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 01:59:09 +0100
Subject: [PATCH 06/10] wip

---
 noxfile.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/noxfile.py b/noxfile.py
index dc365b59d7..12756702fb 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -41,7 +41,7 @@ def venv_cached(session):
 
     """
     result = False
-    yml = Path(f"requirements/ci/py{session.python.replace('.', '')}.yml")
+    yml = Path(f"requirements/ci/nox.lock/py{session.python.replace('.', '')}-linux-64.lock")
     tmp_dir = Path(session.create_tmp())
     cache = tmp_dir / yml.name
     if cache.is_file():

From d8fbd565f9aa922b2e338d16ff88b84396ab8bed Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 08:15:32 +0100
Subject: [PATCH 07/10] add pip

---
 requirements/ci/nox.lock/py36-linux-64.lock | 41 +++++++++++----------
 requirements/ci/nox.lock/py37-linux-64.lock | 10 +++--
 requirements/ci/nox.lock/py38-linux-64.lock | 10 +++--
 requirements/ci/py36.yml                    |  1 +
 requirements/ci/py37.yml                    |  1 +
 requirements/ci/py38.yml                    |  1 +
 6 files changed, 36 insertions(+), 28 deletions(-)

diff --git a/requirements/ci/nox.lock/py36-linux-64.lock b/requirements/ci/nox.lock/py36-linux-64.lock
index 4e8635d406..eed8f05a9e 100644
--- a/requirements/ci/nox.lock/py36-linux-64.lock
+++ b/requirements/ci/nox.lock/py36-linux-64.lock
@@ -1,5 +1,5 @@
 # platform: linux-64
-# env_hash: 051c6f392a22765597fba32aa02d4d74ab5b9ecfa08a6954ad87bff2d3a249ba
+# env_hash: 1a0a1f86b81c9babc7172b8741f714137a8e45bd758c8bd5a328f2051fbc4b62
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2020.12.5-ha878542_0.tar.bz2#7eb5d4ffeee663caa1635cd67071bc1b
@@ -8,12 +8,12 @@ https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-3.000-h77eed3
 https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.038-h77eed37_0.tar.bz2#4d59c254e01d9cde7957100457e2d5fb
 https://conda.anaconda.org/conda-forge/noarch/font-ttf-ubuntu-0.83-hab24e00_0.tar.bz2#19410c3df09dfb12d1206132a1d357c5
 https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.35.1-hea4e1c9_2.tar.bz2#83610dba766a186bdc7a116053b782a4
-https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-9.3.0-hff62375_19.tar.bz2#c2d8da3cb171e4aa642d20c6e4e42a04
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran4-7.5.0-h14aa051_19.tar.bz2#918ebd815b3d8c0491e65dd608e4b917
 https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-9.3.0-h6de172a_19.tar.bz2#cd9a24a8dde03ec0cf0e603b0bea85a1
 https://conda.anaconda.org/conda-forge/linux-64/mpi-1.0-mpich.tar.bz2#c1fcff3417b5a22bbc4cf6e8c23648cf
 https://conda.anaconda.org/conda-forge/linux-64/mysql-common-8.0.23-ha770c72_2.tar.bz2#ce876d0c998e1e2eb1dc67b01937737f
 https://conda.anaconda.org/conda-forge/noarch/fonts-conda-forge-1-0.tar.bz2#f766549260d6815b0c52253f1fb1bb29
-https://conda.anaconda.org/conda-forge/linux-64/libgfortran-ng-9.3.0-hff62375_19.tar.bz2#aea379bd68fdcdf9499fa1453f852ac1
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran-ng-7.5.0-h14aa051_19.tar.bz2#64e976fde4eeac460137f67f0645dd2a
 https://conda.anaconda.org/conda-forge/linux-64/libgomp-9.3.0-h2828fa1_19.tar.bz2#ab0a307912033126da02507b59e79ec9
 https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-1_gnu.tar.bz2#561e277319a41d4f24f5c05a9ef63c04
 https://conda.anaconda.org/conda-forge/noarch/fonts-conda-ecosystem-1-0.tar.bz2#fee5683a3f04bd15cbd8318b096a27ab
@@ -21,7 +21,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.
 https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz2#1378b88874f42ac31b2f8e4f6975cb7b
 https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
 https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.1-h7f98852_1.tar.bz2#ed1dc233ed5e3eaa9bfbaac64d130c5e
-https://conda.anaconda.org/conda-forge/linux-64/expat-2.3.0-h9c3ff4c_0.tar.bz2#1fb8f0254eb78a2a0c120155e1b1a207
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.4.1-h9c3ff4c_0.tar.bz2#16054ef3cb3ec5d8d29d08772662f65d
 https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h516909a_0.tar.bz2#bdc16c2b8852914fdbadb8e4d6361a8b
 https://conda.anaconda.org/conda-forge/linux-64/geos-3.9.1-h9c3ff4c_2.tar.bz2#b9a6d9422aed3ad84ec6ccee9bfcaa0f
 https://conda.anaconda.org/conda-forge/linux-64/giflib-5.2.1-h516909a_2.tar.bz2#70d777f83639cc2c05334b59a6dc9159
@@ -33,13 +33,13 @@ https://conda.anaconda.org/conda-forge/linux-64/libffi-3.3-h58526e2_2.tar.bz2#66
 https://conda.anaconda.org/conda-forge/linux-64/libiconv-1.16-h516909a_0.tar.bz2#5c0f338a513a2943c659ae619fca9211
 https://conda.anaconda.org/conda-forge/linux-64/libmo_unpack-3.1.2-hf484d3e_1001.tar.bz2#95f32a6a5a666d33886ca5627239f03d
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 https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.12.1-py36h5fab9bb_0.tar.bz2#27613fa5d0a4871f4317f2b6e9786104
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-5.12.3-py36h5fab9bb_7.tar.bz2#02315b51b199ef6700a53debf1bada5b
 https://conda.anaconda.org/conda-forge/noarch/requests-2.25.1-pyhd3deb0d_0.tar.bz2#ae687aba31a1c400192a86a2e993ffdc
diff --git a/requirements/ci/nox.lock/py37-linux-64.lock b/requirements/ci/nox.lock/py37-linux-64.lock
index 0388bfc706..5d4cd5b838 100644
--- a/requirements/ci/nox.lock/py37-linux-64.lock
+++ b/requirements/ci/nox.lock/py37-linux-64.lock
@@ -1,5 +1,5 @@
 # platform: linux-64
-# env_hash: 5462fce63dbb32c3e729ca0f078a67e182cc622a6851eafbba57a06c1e552334
+# env_hash: 9f683f7bd19228d6857db32d4372da95f0a29742d9ca4fa18f342162bbd8a667
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2020.12.5-ha878542_0.tar.bz2#7eb5d4ffeee663caa1635cd67071bc1b
@@ -21,7 +21,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.
 https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz2#1378b88874f42ac31b2f8e4f6975cb7b
 https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
 https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.1-h7f98852_1.tar.bz2#ed1dc233ed5e3eaa9bfbaac64d130c5e
-https://conda.anaconda.org/conda-forge/linux-64/expat-2.3.0-h9c3ff4c_0.tar.bz2#1fb8f0254eb78a2a0c120155e1b1a207
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.4.1-h9c3ff4c_0.tar.bz2#16054ef3cb3ec5d8d29d08772662f65d
 https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h516909a_0.tar.bz2#bdc16c2b8852914fdbadb8e4d6361a8b
 https://conda.anaconda.org/conda-forge/linux-64/geos-3.9.1-h9c3ff4c_2.tar.bz2#b9a6d9422aed3ad84ec6ccee9bfcaa0f
 https://conda.anaconda.org/conda-forge/linux-64/giflib-5.2.1-h516909a_2.tar.bz2#70d777f83639cc2c05334b59a6dc9159
@@ -143,6 +143,7 @@ https://conda.anaconda.org/conda-forge/noarch/tblib-1.7.0-pyhd8ed1ab_0.tar.bz2#3
 https://conda.anaconda.org/conda-forge/noarch/toml-0.10.2-pyhd8ed1ab_0.tar.bz2#f832c45a477c78bebd107098db465095
 https://conda.anaconda.org/conda-forge/noarch/toolz-0.11.1-py_0.tar.bz2#d1e66b58cb00b3817ad9f05eec098c00
 https://conda.anaconda.org/conda-forge/noarch/typing_extensions-3.7.4.3-py_0.tar.bz2#12b96e382730541a4b332420227055ae
+https://conda.anaconda.org/conda-forge/noarch/wheel-0.36.2-pyhd3deb0d_0.tar.bz2#768bfbe026426d0e76b377997d1f2b98
 https://conda.anaconda.org/conda-forge/noarch/zipp-3.4.1-pyhd8ed1ab_0.tar.bz2#a4fa30eb74a326092b3d8078b1f1aae1
 https://conda.anaconda.org/conda-forge/linux-64/antlr-python-runtime-4.7.2-py37hc8dfbb8_1002.tar.bz2#67286a6724a0fcf25a283d46d556fefd
 https://conda.anaconda.org/conda-forge/noarch/babel-2.9.1-pyh44b312d_0.tar.bz2#74136ed39bfea0832d338df1e58d013e
@@ -198,7 +199,7 @@ https://conda.anaconda.org/conda-forge/linux-64/scipy-1.6.3-py37h29e03ee_0.tar.b
 https://conda.anaconda.org/conda-forge/linux-64/setuptools-49.6.0-py37h89c1867_3.tar.bz2#928c178bf6805b8ab71fabaa620e0234
 https://conda.anaconda.org/conda-forge/linux-64/shapely-1.7.1-py37hf7ed6d2_4.tar.bz2#0209359199915534c567ffc7fafdb6c4
 https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-napoleon-0.7-py_0.tar.bz2#0bc25ff6f2e34af63ded59692df5f749
-https://conda.anaconda.org/conda-forge/linux-64/virtualenv-20.4.6-py37h89c1867_0.tar.bz2#e66974ad67ebbb86a5fcbb9551641be1
+https://conda.anaconda.org/conda-forge/linux-64/virtualenv-20.4.7-py37h89c1867_0.tar.bz2#50087f16f1a71581a0327956c80debc2
 https://conda.anaconda.org/conda-forge/linux-64/asv-0.4.2-py37hcd2ae1e_2.tar.bz2#a539a23d322e3976dda4af86e59b31ce
 https://conda.anaconda.org/conda-forge/noarch/black-20.8b1-py_1.tar.bz2#e555d6b71ec916c3dc4e6e3793cc9796
 https://conda.anaconda.org/conda-forge/linux-64/bokeh-2.1.1-py37hc8dfbb8_0.tar.bz2#0927f1a093279ba797f014c5e484a58f
@@ -207,13 +208,14 @@ https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.5.0-py37h89c186
 https://conda.anaconda.org/conda-forge/linux-64/esmf-8.1.1-mpi_mpich_h3dcaa78_100.tar.bz2#5b4bab1017226f2c03ba0fe02b783316
 https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.2-pyhd8ed1ab_0.tar.bz2#37d685abea0a25c921431edda02ad143
 https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-h539f30e_1.tar.bz2#606777b4da3664d5c9415f5f165349fd
-https://conda.anaconda.org/conda-forge/noarch/identify-2.2.5-pyhd8ed1ab_0.tar.bz2#21f587a49bb0d8036951149354f2537d
+https://conda.anaconda.org/conda-forge/noarch/identify-2.2.6-pyhd8ed1ab_0.tar.bz2#65bfce1f4233d5473b452989ed49a69a
 https://conda.anaconda.org/conda-forge/noarch/imagehash-4.2.0-pyhd8ed1ab_0.tar.bz2#e5a77472ae964f2835fce16355bbfe64
 https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.5-hc3c00ef_0.tar.bz2#1362366116e80bcfbe9c7cd99766ea40
 https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.4.2-py37hdd32ed1_0.tar.bz2#ee755b80aae171058a46c5d7badd08ff
 https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.6-nompi_py37h946d57d_103.tar.bz2#600a3ba1f0b13ca31d4f593f1fa490b4
 https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.6.0-pyhd8ed1ab_0.tar.bz2#0941325bf48969e2b3b19d0951740950
 https://conda.anaconda.org/conda-forge/linux-64/nose-1.3.7-py37hc8dfbb8_1004.tar.bz2#89aff4210d768c430d6ee4efcc20aa87
+https://conda.anaconda.org/conda-forge/noarch/pip-21.1.2-pyhd8ed1ab_0.tar.bz2#dbd830edaffe5fc9ae6c1d425db2b5f2
 https://conda.anaconda.org/conda-forge/noarch/pygments-2.9.0-pyhd8ed1ab_0.tar.bz2#a2d9bba43c9b80a42b0ccb9afd7223c2
 https://conda.anaconda.org/conda-forge/noarch/pyopenssl-20.0.1-pyhd8ed1ab_0.tar.bz2#92371c25994d0f5d28a01c1fb75ebf86
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py37he336c9b_7.tar.bz2#303251d6f2b9e60a0cd79480cf8507d2
diff --git a/requirements/ci/nox.lock/py38-linux-64.lock b/requirements/ci/nox.lock/py38-linux-64.lock
index bd4c8c7c1b..743342232a 100644
--- a/requirements/ci/nox.lock/py38-linux-64.lock
+++ b/requirements/ci/nox.lock/py38-linux-64.lock
@@ -1,5 +1,5 @@
 # platform: linux-64
-# env_hash: f597df66373a21f9c217dc7d61b727077fd5e9013f2822fc41ceb690f3a4ffa9
+# env_hash: 25d37d9c9841bf7d79d238578d4063a437222f0b5c8e90ee78623b3e38cf0b0b
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2020.12.5-ha878542_0.tar.bz2#7eb5d4ffeee663caa1635cd67071bc1b
@@ -21,7 +21,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.
 https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz2#1378b88874f42ac31b2f8e4f6975cb7b
 https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
 https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.1-h7f98852_1.tar.bz2#ed1dc233ed5e3eaa9bfbaac64d130c5e
-https://conda.anaconda.org/conda-forge/linux-64/expat-2.3.0-h9c3ff4c_0.tar.bz2#1fb8f0254eb78a2a0c120155e1b1a207
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.4.1-h9c3ff4c_0.tar.bz2#16054ef3cb3ec5d8d29d08772662f65d
 https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h516909a_0.tar.bz2#bdc16c2b8852914fdbadb8e4d6361a8b
 https://conda.anaconda.org/conda-forge/linux-64/geos-3.9.1-h9c3ff4c_2.tar.bz2#b9a6d9422aed3ad84ec6ccee9bfcaa0f
 https://conda.anaconda.org/conda-forge/linux-64/giflib-5.2.1-h516909a_2.tar.bz2#70d777f83639cc2c05334b59a6dc9159
@@ -143,6 +143,7 @@ https://conda.anaconda.org/conda-forge/noarch/tblib-1.7.0-pyhd8ed1ab_0.tar.bz2#3
 https://conda.anaconda.org/conda-forge/noarch/toml-0.10.2-pyhd8ed1ab_0.tar.bz2#f832c45a477c78bebd107098db465095
 https://conda.anaconda.org/conda-forge/noarch/toolz-0.11.1-py_0.tar.bz2#d1e66b58cb00b3817ad9f05eec098c00
 https://conda.anaconda.org/conda-forge/noarch/typing_extensions-3.7.4.3-py_0.tar.bz2#12b96e382730541a4b332420227055ae
+https://conda.anaconda.org/conda-forge/noarch/wheel-0.36.2-pyhd3deb0d_0.tar.bz2#768bfbe026426d0e76b377997d1f2b98
 https://conda.anaconda.org/conda-forge/noarch/zipp-3.4.1-pyhd8ed1ab_0.tar.bz2#a4fa30eb74a326092b3d8078b1f1aae1
 https://conda.anaconda.org/conda-forge/linux-64/antlr-python-runtime-4.7.2-py38h578d9bd_1002.tar.bz2#2b2207e2c8a05fc0bc5b62fc32c355e6
 https://conda.anaconda.org/conda-forge/noarch/babel-2.9.1-pyh44b312d_0.tar.bz2#74136ed39bfea0832d338df1e58d013e
@@ -178,7 +179,7 @@ https://conda.anaconda.org/conda-forge/linux-64/pyyaml-5.4.1-py38h497a2fe_0.tar.
 https://conda.anaconda.org/conda-forge/linux-64/regex-2021.4.4-py38h497a2fe_0.tar.bz2#fd8c69b8da2edc1dbdf6ff619257ee00
 https://conda.anaconda.org/conda-forge/linux-64/tornado-6.1-py38h497a2fe_1.tar.bz2#e772c8383768280af283e814e2126663
 https://conda.anaconda.org/conda-forge/linux-64/typed-ast-1.4.3-py38h497a2fe_0.tar.bz2#f4a5eeaccf5c5bab10491071ea2e32b1
-https://conda.anaconda.org/conda-forge/linux-64/virtualenv-20.4.6-py38h578d9bd_0.tar.bz2#021bbd21b02800d2ff9c7a05b3e77631
+https://conda.anaconda.org/conda-forge/linux-64/virtualenv-20.4.7-py38h578d9bd_0.tar.bz2#24b5e0295c43de15a51afb00f93a41de
 https://conda.anaconda.org/conda-forge/noarch/zict-2.0.0-py_0.tar.bz2#4750152be22f24d695b3004c5e1712d3
 https://conda.anaconda.org/conda-forge/noarch/black-20.8b1-py_1.tar.bz2#e555d6b71ec916c3dc4e6e3793cc9796
 https://conda.anaconda.org/conda-forge/linux-64/brotlipy-0.7.0-py38h497a2fe_1001.tar.bz2#56753dd777a6517b34966ddcb39af734
@@ -205,13 +206,14 @@ https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.5.0-py38h578d9b
 https://conda.anaconda.org/conda-forge/linux-64/esmf-8.1.1-mpi_mpich_h3dcaa78_100.tar.bz2#5b4bab1017226f2c03ba0fe02b783316
 https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.2-pyhd8ed1ab_0.tar.bz2#37d685abea0a25c921431edda02ad143
 https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-h539f30e_1.tar.bz2#606777b4da3664d5c9415f5f165349fd
-https://conda.anaconda.org/conda-forge/noarch/identify-2.2.5-pyhd8ed1ab_0.tar.bz2#21f587a49bb0d8036951149354f2537d
+https://conda.anaconda.org/conda-forge/noarch/identify-2.2.6-pyhd8ed1ab_0.tar.bz2#65bfce1f4233d5473b452989ed49a69a
 https://conda.anaconda.org/conda-forge/noarch/imagehash-4.2.0-pyhd8ed1ab_0.tar.bz2#e5a77472ae964f2835fce16355bbfe64
 https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.5-hc3c00ef_0.tar.bz2#1362366116e80bcfbe9c7cd99766ea40
 https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.4.2-py38hcc49a3a_0.tar.bz2#4bfb6818a1fce6d4129fdf121f788505
 https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.6-nompi_py38h5e9db54_103.tar.bz2#72a5656daeee23c80e22b936bef0ceb3
 https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.6.0-pyhd8ed1ab_0.tar.bz2#0941325bf48969e2b3b19d0951740950
 https://conda.anaconda.org/conda-forge/linux-64/nose-1.3.7-py38h32f6830_1004.tar.bz2#c3f4d188368c26f373930da0171be824
+https://conda.anaconda.org/conda-forge/noarch/pip-21.1.2-pyhd8ed1ab_0.tar.bz2#dbd830edaffe5fc9ae6c1d425db2b5f2
 https://conda.anaconda.org/conda-forge/noarch/pygments-2.9.0-pyhd8ed1ab_0.tar.bz2#a2d9bba43c9b80a42b0ccb9afd7223c2
 https://conda.anaconda.org/conda-forge/noarch/pyopenssl-20.0.1-pyhd8ed1ab_0.tar.bz2#92371c25994d0f5d28a01c1fb75ebf86
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py38h7400c14_7.tar.bz2#8fe28c949b01e3d69c2b357b5abf3916
diff --git a/requirements/ci/py36.yml b/requirements/ci/py36.yml
index 4d9d25d7c6..f778704803 100644
--- a/requirements/ci/py36.yml
+++ b/requirements/ci/py36.yml
@@ -28,6 +28,7 @@ dependencies:
   - mo_pack
   - nc-time-axis
   - pandas
+  - pip
   - python-stratify
   - pyugrid
 
diff --git a/requirements/ci/py37.yml b/requirements/ci/py37.yml
index bdb097796a..5b21e9f778 100644
--- a/requirements/ci/py37.yml
+++ b/requirements/ci/py37.yml
@@ -28,6 +28,7 @@ dependencies:
   - mo_pack
   - nc-time-axis
   - pandas
+  - pip
   - python-stratify
   - pyugrid
 
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index da29d30d71..e09a7a7164 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -28,6 +28,7 @@ dependencies:
   - mo_pack
   - nc-time-axis
   - pandas
+  - pip
   - python-stratify
   - pyugrid
 

From 56b9cb8cffb445f932bf938d2d68436b5468d778 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 09:16:46 +0100
Subject: [PATCH 08/10] revert docker

---
 .cirrus.yml | 248 +++++++++++++++++++++-------------------------------
 noxfile.py  | 222 +++++++++++++++++++++-------------------------
 2 files changed, 204 insertions(+), 266 deletions(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index f36e444414..13105b13cc 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -3,8 +3,6 @@
 #   - https://cirrus-ci.org/guide/writing-tasks/#environment-variables
 #   - https://cirrus-ci.org/guide/tips-and-tricks/#sharing-configuration-between-tasks
 #   - https://cirrus-ci.org/guide/linux/
-#   - https://cirrus-ci.org/guide/macOS/
-#   - https://cirrus-ci.org/guide/windows/
 #   - https://hub.docker.com/_/gcc/
 #   - https://hub.docker.com/_/python/
 
@@ -12,19 +10,19 @@
 # Global defaults.
 #
 container:
-  image: python:3.8
+  image: gcc:latest
   cpu: 2
   memory: 4G
 
 
 env:
   # Skip specific tasks by name. Set to a non-empty string to skip.
-  SKIP_LINT_TASK: "x"
+  SKIP_LINT_TASK: ""
   SKIP_TEST_MINIMAL_TASK: ""
-  SKIP_TEST_FULL_TASK: "x"
-  SKIP_GALLERY_TASK: "x"
-  SKIP_DOCTEST_TASK: "x"
-  SKIP_LINKCHECK_TASK: "x"
+  SKIP_TEST_FULL_TASK: ""
+  SKIP_GALLERY_TASK: ""
+  SKIP_DOCTEST_TASK: ""
+  SKIP_LINKCHECK_TASK: ""
   # Skip task groups by type. Set to a non-empty string to skip.
   SKIP_ALL_TEST_TASKS: ""
   SKIP_ALL_DOC_TASKS: ""
@@ -32,91 +30,102 @@ env:
   CACHE_PERIOD: "2"
   # Increment the build number to force new cartopy cache upload.
   CARTOPY_CACHE_BUILD: "0"
+  # Increment the build number to force new conda cache upload.
+  CONDA_CACHE_BUILD: "0"
+  # Increment the build number to force new nox cache upload.
+  NOX_CACHE_BUILD: "0"
+  # Increment the build number to force new pip cache upload.
+  PIP_CACHE_BUILD: "0"
+  # Pip packages to be upgraded/installed.
+  PIP_CACHE_PACKAGES: "pip setuptools wheel nox"
+  # Conda packages to be installed.
+  CONDA_CACHE_PACKAGES: "nox pip"
   # Git commit hash for iris test data.
-  IRIS_TEST_DATA_REF: "fffb9b14b9cb472c5eb2ebb7fd19acb7f6414a30"
+  IRIS_TEST_DATA_VERSION: "2.0.0"
   # Base directory for the iris-test-data.
   IRIS_TEST_DATA_DIR: ${HOME}/iris-test-data
 
 
 #
-# YAML alias for common linux test infra-structure
+# YAML alias for common linux test infra-structure.
 #
 linux_task_template: &LINUX_TASK_TEMPLATE
   auto_cancellation: true
   env:
+    PATH: ${HOME}/miniconda/bin:${PATH}
     SITE_CFG: ${CIRRUS_WORKING_DIR}/lib/iris/etc/site.cfg
+  conda_cache:
+    folder: ${HOME}/miniconda
+    fingerprint_script:
+      - wget --quiet https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh
+      - echo "${CIRRUS_OS} $(sha256sum miniconda.sh)"
+      - echo "${CONDA_CACHE_PACKAGES}"
+      - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${CONDA_CACHE_BUILD}"
+      - uname -r
+    populate_script:
+      - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
+      - bash miniconda.sh -b -p ${HOME}/miniconda
+      - conda config --set always_yes yes --set changeps1 no
+      - conda config --set show_channel_urls True
+      - conda config --add channels conda-forge
+      - conda update --quiet --name base conda
+      - conda install --quiet --name base ${CONDA_CACHE_PACKAGES}
   cartopy_cache:
     folder: ${HOME}/.local/share/cartopy
     fingerprint_script:
       - echo "${CIRRUS_OS}"
       - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${CARTOPY_CACHE_BUILD}"
+  nox_cache:
+    folder: ${CIRRUS_WORKING_DIR}/.nox
+    reupload_on_changes: true
+    fingerprint_script:
+      - echo "${CIRRUS_TASK_NAME}"
+      - echo "${NOX_CACHE_BUILD}"
 
 
 #
-# YAML alias for common docker build infra-structure
-#
-docker_template: &DOCKER_TEMPLATE
-  env:
-    DOCKER_USERNAME: "ENCRYPTED\
-                      [a5ba7e105e04f79ce57c408f280d92c8c9c094ca0b1723d2\
-                      3850f8282be48041c0012a8e2efaa6e2f11a297c3bdc0b4a]"
-    DOCKER_PASSWORD: "ENCRYPTED\
-                      [549d20937f4c8862bea2e48312f8a68635474bf5593c959b\
-                      25ae7b6c86dbdcdb4e54045b9e2a3876fc5dde0cc251ad0a]"
-  build_script:
-    - docker image pull bjlittle/cirrus-ci-py${PY_VER}:latest || true
-    - docker build --cache-from bjlittle/cirrus-ci-py${PY_VER}:latest --build-arg PY_VER=${PY_VER} --tag bjlittle/cirrus-ci-py${PY_VER} requirements/ci/nox.lock/.
-    - docker tag bjlittle/cirrus-ci-py${PY_VER} bjlittle/cirrus-ci-py${PY_VER}:${CIRRUS_BUILD_ID}
-    - echo ${DOCKER_PASSWORD} | docker login --username ${DOCKER_USERNAME} --password-stdin
-    - docker push bjlittle/cirrus-ci-py${PY_VER}
-
-
-#
-# YAML alias for compute credits
+# YAML alias for compute credits.
 #
 compute_credits_template: &CREDITS_TEMPLATE
   # Only use credits for non-DRAFT pull-requests to SciTools/iris master branch by collaborators
-  use_compute_credits: $CIRRUS_REPO_FULL_NAME == 'SciTools/iris' && $CIRRUS_USER_COLLABORATOR == 'true' && $CIRRUS_PR_DRAFT == 'false' && $CIRRUS_BASE_BRANCH == 'master' && $CIRRUS_PR != ''
+  use_compute_credits: ${CIRRUS_REPO_FULL_NAME} == "SciTools/iris" && ${CIRRUS_USER_COLLABORATOR} == "true" && ${CIRRUS_PR_DRAFT} == "false" && ${CIRRUS_PR} != ""
 
 
 #
-# Docker
+# YAML alias for the iris-test-data cache.
 #
-docker_builder:
-  alias: builder-py36
-  env:
-    PY_VER: 36
-  name: "${CIRRUS_OS}: py${PY_VER} docker builder"
-  << : *DOCKER_TEMPLATE
-
-
-docker_builder:
-  alias: builder-py37
-  env:
-    PY_VER: 37
-  name: "${CIRRUS_OS}: py${PY_VER} docker builder"
-  << : *DOCKER_TEMPLATE
-
-
-docker_builder:
-  alias: builder-py38
-  env:
-    PY_VER: 38
-  name: "${CIRRUS_OS}: py${PY_VER} docker builder"
-  << : *DOCKER_TEMPLATE
+iris_test_data_template: &IRIS_TEST_DATA_TEMPLATE
+  data_cache:
+    folder: ${IRIS_TEST_DATA_DIR}
+    fingerprint_script:
+      - echo "iris-test-data v${IRIS_TEST_DATA_VERSION}"
+    populate_script:
+      - wget --quiet https://github.com/SciTools/iris-test-data/archive/v${IRIS_TEST_DATA_VERSION}.zip -O iris-test-data.zip
+      - unzip -q iris-test-data.zip
+      - mv iris-test-data-${IRIS_TEST_DATA_VERSION} ${IRIS_TEST_DATA_DIR}
 
 
 #
 # Linting
 #
 lint_task:
-  name: "${CIRRUS_OS}: flake8 and black"
-  only_if: $SKIP_LINT_TASK == ""
-  depends_on:
-    - builder-py38
-  auto_cancellation: true
+  only_if: ${SKIP_LINT_TASK} == ""
   << : *CREDITS_TEMPLATE
+  auto_cancellation: true
+  container:
+    image: python:3.8
+    cpu: 2
+    memory: 4G
+  name: "${CIRRUS_OS}: flake8 and black"
+  pip_cache:
+    folder: ~/.cache/pip
+    fingerprint_script:
+      - echo "${CIRRUS_TASK_NAME} py${PYTHON_VERSION}"
+      - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${PIP_CACHE_BUILD} ${PIP_CACHE_PACKAGES}"
   lint_script:
+    - pip list
+    - python -m pip install --retries 3 --upgrade ${PIP_CACHE_PACKAGES}
+    - pip list
     - nox --session flake8
     - nox --session black
 
@@ -125,154 +134,100 @@ lint_task:
 # Testing Minimal (Linux)
 #
 test_minimal_task:
-  only_if: $SKIP_TEST_MINIMAL_TASK == "" && $SKIP_ALL_TEST_TASKS == ""
+  only_if: ${SKIP_TEST_MINIMAL_TASK} == "" && ${SKIP_ALL_TEST_TASKS} == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    - depends_on:
-        builder-py36
-      env:
-        PY_VER: 3.6
-      container:
-        image: bjlittle/cirrus-ci-py36:latest
-        cpu: 2
-        memory: 4G
-    - depends_on:
-        builder-py37
-      env:
-        PY_VER: 3.7
-      container:
-        image: bjlittle/cirrus-ci-py37:latest
-        cpu: 2
-        memory: 4G
-    - depends_on:
-        builder-py38
-      env:
-        PY_VER: 3.8
-      container:
-        image: bjlittle/cirrus-ci-py38:latest
-        cpu: 2
-        memory: 4G
+    env:
+      PY_VER: 3.6
+    env:
+      PY_VER: 3.7
+    env:
+      PY_VER: 3.8
   name: "${CIRRUS_OS}: py${PY_VER} tests (minimal)"
   << : *LINUX_TASK_TEMPLATE
   tests_script:
-    - ln -s /root/scitools/.nox .nox
+    - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
     - echo "[Resources]" > ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
-    - nox --session tests
+    - nox --session tests -- --verbose
 
 
 #
 # Testing Full (Linux)
 #
 test_full_task:
-  only_if: $SKIP_TEST_FULL_TASK == "" && $SKIP_ALL_TEST_TASKS == ""
+  only_if: ${SKIP_TEST_FULL_TASK} == "" && ${SKIP_ALL_TEST_TASKS} == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    - depends_on:
-        builder-py36
-      env:
-        PY_VER: 3.6
-      container:
-        image: bjlittle/cirrus-ci-py36:latest
-        cpu: 6
-        memory: 8G
-    - depends_on:
-        builder-py37
-      env:
-        PY_VER: 3.7
-      container:
-        image: bjlittle/cirrus-ci-py37:latest
-    - depends_on:
-        builder-py38
-      env:
-        PY_VER: 3.8
-      container:
-        image: bjlittle/cirrus-ci-py38:latest
-        cpu: 6
-        memory: 8G
+    env:
+      PY_VER: 3.6
+    env:
+      PY_VER: 3.7
+    env:
+      PY_VER: 3.8
   name: "${CIRRUS_OS}: py${PY_VER} tests (full)"
-  data_cache:
-    folder: ${IRIS_TEST_DATA_DIR}
-    fingerprint_script:
-      - echo "${IRIS_TEST_DATA_REF}"
-    populate_script:
-      - wget --quiet https://github.com/SciTools/iris-test-data/archive/${IRIS_TEST_DATA_REF}.zip -O iris-test-data.zip
-      - unzip -q iris-test-data.zip
-      - mv iris-test-data-$(echo "${IRIS_TEST_DATA_REF}" | sed "s/^v//") ${IRIS_TEST_DATA_DIR}
+  container:
+    image: gcc:latest
+    cpu: 6
+    memory: 8G
+  << : *IRIS_TEST_DATA_TEMPLATE
   << : *LINUX_TASK_TEMPLATE
   tests_script:
+    - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
     - echo "[Resources]" > ${SITE_CFG}
     - echo "test_data_dir = ${IRIS_TEST_DATA_DIR}/test_data" >> ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
-    - nox --session tests
+    - nox --session tests -- --verbose
 
 
 #
 # Testing Documentation Gallery (Linux)
 #
 gallery_task:
-  only_if: $SKIP_GALLERY_TASK == "" && $SKIP_ALL_DOC_TASKS == ""
-  depends_on:
-    - builder-py38
+  only_if: ${SKIP_GALLERY_TASK} == "" && ${SKIP_ALL_DOC_TASKS} == ""
   << : *CREDITS_TEMPLATE
   env:
     PY_VER: 3.8
   name: "${CIRRUS_OS}: py${PY_VER} doc tests (gallery)"
-  data_cache:
-    folder: ${IRIS_TEST_DATA_DIR}
-    fingerprint_script:
-      - echo "${IRIS_TEST_DATA_REF}"
-    populate_script:
-      - wget --quiet https://github.com/SciTools/iris-test-data/archive/${IRIS_TEST_DATA_REF}.zip -O iris-test-data.zip
-      - unzip -q iris-test-data.zip
-      - mv iris-test-data-$(echo "${IRIS_TEST_DATA_REF}" | sed "s/^v//") ${IRIS_TEST_DATA_DIR}
+  << : *IRIS_TEST_DATA_TEMPLATE
   << : *LINUX_TASK_TEMPLATE
   tests_script:
+    - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
     - echo "[Resources]" > ${SITE_CFG}
     - echo "test_data_dir = ${IRIS_TEST_DATA_DIR}/test_data" >> ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
-    - nox --session gallery
+    - nox --session gallery -- --verbose
 
 
 #
 # Testing Documentation (Linux)
 #
 doctest_task:
-  only_if: $SKIP_DOCTEST_TASK == "" && $SKIP_ALL_DOC_TASKS == ""
-  depends_on:
-    - builder-py38
+  only_if: ${SKIP_DOCTEST_TASK} == "" && ${SKIP_ALL_DOC_TASKS} == ""
   << : *CREDITS_TEMPLATE
   env:
     PY_VER: 3.8
     MPL_RC_DIR: ${HOME}/.config/matplotlib
     MPL_RC_FILE: ${HOME}/.config/matplotlib/matplotlibrc
   name: "${CIRRUS_OS}: py${PY_VER} doc tests"
-  data_cache:
-    folder: ${IRIS_TEST_DATA_DIR}
-    fingerprint_script:
-      - echo "${IRIS_TEST_DATA_REF}"
-    populate_script:
-      - wget --quiet https://github.com/SciTools/iris-test-data/archive/${IRIS_TEST_DATA_REF}.zip -O iris-test-data.zip
-      - unzip -q iris-test-data.zip
-      - mv iris-test-data-$(echo "${IRIS_TEST_DATA_REF}" | sed "s/^v//") ${IRIS_TEST_DATA_DIR}
+  << : *IRIS_TEST_DATA_TEMPLATE
   << : *LINUX_TASK_TEMPLATE
   tests_script:
+    - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
     - echo "[Resources]" > ${SITE_CFG}
     - echo "test_data_dir = ${IRIS_TEST_DATA_DIR}/test_data" >> ${SITE_CFG}
     - echo "doc_dir = ${CIRRUS_WORKING_DIR}/docs/iris" >> ${SITE_CFG}
     - mkdir -p ${MPL_RC_DIR}
     - echo "backend : agg" > ${MPL_RC_FILE}
     - echo "image.cmap : viridis" >> ${MPL_RC_FILE}
-    - nox --session doctest
+    - nox --session doctest -- --verbose
 
 
 #
 # Testing Documentation Link Check (Linux)
 #
 linkcheck_task:
-  only_if: $SKIP_LINKCHECK_TASK == "" && $SKIP_ALL_DOC_TASKS == ""
-  depends_on:
-    - builder-py38
+  only_if: ${SKIP_LINKCHECK_TASK} == "" && ${SKIP_ALL_DOC_TASKS} == ""
   << : *CREDITS_TEMPLATE
   env:
     PY_VER: 3.8
@@ -281,7 +236,8 @@ linkcheck_task:
   name: "${CIRRUS_OS}: py${PY_VER} doc link check"
   << : *LINUX_TASK_TEMPLATE
   tests_script:
+    - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
     - mkdir -p ${MPL_RC_DIR}
     - echo "backend : agg" > ${MPL_RC_FILE}
     - echo "image.cmap : viridis" >> ${MPL_RC_FILE}
-    - nox --session linkcheck
+    - nox --session linkcheck -- --verbose
diff --git a/noxfile.py b/noxfile.py
index 12756702fb..0a14732ec2 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -10,6 +10,7 @@
 from pathlib import Path
 
 import nox
+from nox.logger import logger
 
 
 #: Default to reusing any pre-existing nox environments.
@@ -25,40 +26,48 @@
 CARTOPY_CACHE_DIR = os.environ.get("HOME") / Path(".local/share/cartopy")
 
 
-def venv_cached(session):
-    """
-    Determine whether the nox session environment has been cached.
-
-    Parameters
-    ----------
-    session: object
-        A `nox.sessions.Session` object.
+def session_lockfile(session: nox.sessions.Session) -> Path:
+    """Return the path of the session lockfile."""
+    return Path(
+        f"requirements/ci/nox.lock/py{session.python.replace('.', '')}-linux-64.lock"
+    )
 
-    Returns
-    -------
-    bool
-        Whether the session has been cached.
 
-    """
-    result = False
-    yml = Path(f"requirements/ci/nox.lock/py{session.python.replace('.', '')}-linux-64.lock")
+def session_cachefile(session: nox.sessions.Session) -> Path:
+    """Returns the path of the session lockfile cache."""
+    lockfile = session_lockfile(session)
     tmp_dir = Path(session.create_tmp())
-    cache = tmp_dir / yml.name
+    cache = tmp_dir / lockfile.name
+    return cache
+
+
+def venv_populated(session: nox.sessions.Session) -> bool:
+    """Returns True if the conda venv has been created
+    and the list of packages in the lockfile installed."""
+    return session_cachefile(session).is_file()
+
+
+def venv_changed(session: nox.sessions.Session) -> bool:
+    """Returns True if the installed session is different to that specified
+    in the lockfile."""
+    changed = False
+    cache = session_cachefile(session)
+    lockfile = session_lockfile(session)
     if cache.is_file():
-        with open(yml, "rb") as fi:
+        with open(lockfile, "rb") as fi:
             expected = hashlib.sha256(fi.read()).hexdigest()
         with open(cache, "r") as fi:
             actual = fi.read()
-        result = actual == expected
-    return result
+        changed = actual != expected
+    return changed
 
 
-def cache_venv(session):
+def cache_venv(session: nox.sessions.Session) -> None:
     """
     Cache the nox session environment.
 
     This consists of saving a hexdigest (sha256) of the associated
-    conda requirements YAML file.
+    conda lock file.
 
     Parameters
     ----------
@@ -66,16 +75,15 @@ def cache_venv(session):
         A `nox.sessions.Session` object.
 
     """
-    yml = Path(f"requirements/ci/py{session.python.replace('.', '')}.yml")
-    with open(yml, "rb") as fi:
+    lockfile = session_lockfile(session)
+    cache = session_cachefile(session)
+    with open(lockfile, "rb") as fi:
         hexdigest = hashlib.sha256(fi.read()).hexdigest()
-    tmp_dir = Path(session.create_tmp())
-    cache = tmp_dir / yml.name
     with open(cache, "w") as fo:
         fo.write(hexdigest)
 
 
-def cache_cartopy(session):
+def cache_cartopy(session: nox.sessions.Session) -> None:
     """
     Determine whether to cache the cartopy natural earth shapefiles.
 
@@ -93,8 +101,66 @@ def cache_cartopy(session):
         )
 
 
+def prepare_venv(session: nox.sessions.Session) -> None:
+    """
+    Create and cache the nox session conda environment, and additionally
+    provide conda environment package details and info.
+
+    Note that, iris is installed into the environment using pip.
+
+    Parameters
+    ----------
+    session: object
+        A `nox.sessions.Session` object.
+
+    Notes
+    -----
+    See
+      - https://github.com/theacodes/nox/issues/346
+      - https://github.com/theacodes/nox/issues/260
+
+    """
+    lockfile = session_lockfile(session)
+    venv_dir = session.virtualenv.location_name
+
+    if not venv_populated(session):
+        # environment has been created but packages not yet installed
+        # populate the environment from the lockfile
+        logger.debug(f"Populating conda env at {venv_dir}")
+        session.conda_install("--file", str(lockfile))
+        cache_venv(session)
+
+    elif venv_changed(session):
+        # destroy the environment and rebuild it
+        logger.debug(f"Lockfile changed. Re-creating conda env at {venv_dir}")
+        _re_orig = session.virtualenv.reuse_existing
+        session.virtualenv.reuse_existing = False
+        session.virtualenv.create()
+        session.conda_install("--file", str(lockfile))
+        session.virtualenv.reuse_existing = _re_orig
+        cache_venv(session)
+
+    logger.debug(f"Environment {venv_dir} is up to date")
+
+    cache_cartopy(session)
+
+    # Determine whether verbose diagnostics have been requested
+    # from the command line.
+    verbose = "-v" in session.posargs or "--verbose" in session.posargs
+
+    if verbose:
+        session.run("conda", "info")
+        session.run("conda", "list", f"--prefix={venv_dir}")
+        session.run(
+            "conda",
+            "list",
+            f"--prefix={venv_dir}",
+            "--explicit",
+        )
+
+
 @nox.session
-def flake8(session):
+def flake8(session: nox.sessions.Session):
     """
     Perform flake8 linting of iris.
 
@@ -113,7 +179,7 @@ def flake8(session):
 
 
 @nox.session
-def black(session):
+def black(session: nox.sessions.Session):
     """
     Perform black format checking of iris.
 
@@ -132,7 +198,7 @@ def black(session):
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
-def tests(session):
+def tests(session: nox.sessions.Session):
     """
     Perform iris system, integration and unit tests.
 
@@ -141,29 +207,8 @@ def tests(session):
     session: object
         A `nox.sessions.Session` object.
 
-    Notes
-    -----
-    See
-      - https://github.com/theacodes/nox/issues/346
-      - https://github.com/theacodes/nox/issues/260
-
     """
-    if not venv_cached(session):
-        # Determine the conda requirements yaml file.
-        fname = f"requirements/ci/py{session.python.replace('.', '')}.yml"
-        # Back-door approach to force nox to use "conda env update".
-        command = (
-            "conda",
-            "env",
-            "update",
-            f"--prefix={session.virtualenv.location}",
-            f"--file={fname}",
-            "--prune",
-        )
-        session._run(*command, silent=True, external="error")
-        cache_venv(session)
-
-    cache_cartopy(session)
+    prepare_venv(session)
     session.install("--no-deps", "--editable", ".")
     session.run(
         "python",
@@ -175,7 +220,7 @@ def tests(session):
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
-def gallery(session):
+def gallery(session: nox.sessions.Session):
     """
     Perform iris gallery doc-tests.
 
@@ -184,29 +229,8 @@ def gallery(session):
     session: object
         A `nox.sessions.Session` object.
 
-    Notes
-    -----
-    See
-      - https://github.com/theacodes/nox/issues/346
-      - https://github.com/theacodes/nox/issues/260
-
     """
-    if not venv_cached(session):
-        # Determine the conda requirements yaml file.
-        fname = f"requirements/ci/py{session.python.replace('.', '')}.yml"
-        # Back-door approach to force nox to use "conda env update".
-        command = (
-            "conda",
-            "env",
-            "update",
-            f"--prefix={session.virtualenv.location}",
-            f"--file={fname}",
-            "--prune",
-        )
-        session._run(*command, silent=True, external="error")
-        cache_venv(session)
-
-    cache_cartopy(session)
+    prepare_venv(session)
     session.install("--no-deps", "--editable", ".")
     session.run(
         "python",
@@ -217,7 +241,7 @@ def gallery(session):
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
-def doctest(session):
+def doctest(session: nox.sessions.Session):
     """
     Perform iris doc-tests.
 
@@ -226,29 +250,8 @@ def doctest(session):
     session: object
         A `nox.sessions.Session` object.
 
-    Notes
-    -----
-    See
-      - https://github.com/theacodes/nox/issues/346
-      - https://github.com/theacodes/nox/issues/260
-
     """
-    if not venv_cached(session):
-        # Determine the conda requirements yaml file.
-        fname = f"requirements/ci/py{session.python.replace('.', '')}.yml"
-        # Back-door approach to force nox to use "conda env update".
-        command = (
-            "conda",
-            "env",
-            "update",
-            f"--prefix={session.virtualenv.location}",
-            f"--file={fname}",
-            "--prune",
-        )
-        session._run(*command, silent=True, external="error")
-        cache_venv(session)
-
-    cache_cartopy(session)
+    prepare_venv(session)
     session.install("--no-deps", "--editable", ".")
     session.cd("docs/iris")
     session.run(
@@ -265,7 +268,7 @@ def doctest(session):
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
-def linkcheck(session):
+def linkcheck(session: nox.sessions.Session):
     """
     Perform iris doc link check.
 
@@ -274,29 +277,8 @@ def linkcheck(session):
     session: object
         A `nox.sessions.Session` object.
 
-    Notes
-    -----
-    See
-      - https://github.com/theacodes/nox/issues/346
-      - https://github.com/theacodes/nox/issues/260
-
     """
-    if not venv_cached(session):
-        # Determine the conda requirements yaml file.
-        fname = f"requirements/ci/py{session.python.replace('.', '')}.yml"
-        # Back-door approach to force nox to use "conda env update".
-        command = (
-            "conda",
-            "env",
-            "update",
-            f"--prefix={session.virtualenv.location}",
-            f"--file={fname}",
-            "--prune",
-        )
-        session._run(*command, silent=True, external="error")
-        cache_venv(session)
-
-    cache_cartopy(session)
+    prepare_venv(session)
     session.install("--no-deps", "--editable", ".")
     session.cd("docs/iris")
     session.run(

From a89beadb344243d684ba19e3a223da012e6595fc Mon Sep 17 00:00:00 2001
From: Ruth Comer <10599679+rcomer@users.noreply.github.com>
Date: Tue, 25 May 2021 14:19:33 +0100
Subject: [PATCH 09/10] fix add_weekday (#32)

* fix add_weekday

* fix black link
---
 .../developers_guide/contributing_code_formatting.rst    | 2 +-
 lib/iris/coord_categorisation.py                         | 9 +++------
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/docs/iris/src/developers_guide/contributing_code_formatting.rst b/docs/iris/src/developers_guide/contributing_code_formatting.rst
index 1a3573d135..5b726b41e7 100644
--- a/docs/iris/src/developers_guide/contributing_code_formatting.rst
+++ b/docs/iris/src/developers_guide/contributing_code_formatting.rst
@@ -39,7 +39,7 @@ linted according to our ``.flake8`` configuration file. Note that,
 for each ``.pre-commit-config.yaml`` git hook.
 
 Additionally, you may wish to enable ``black`` for your preferred
-`editor/IDE <https://black.readthedocs.io/en/stable/editor_integration.html#editor-integration>`_.
+`editor/IDE <https://black.readthedocs.io/en/stable/integrations/editors.html>`_.
 
 With the ``pre-commit`` configured, the output of performing a ``git commit``
 will look similar to::
diff --git a/lib/iris/coord_categorisation.py b/lib/iris/coord_categorisation.py
index d299cbeaa4..1553835ae9 100644
--- a/lib/iris/coord_categorisation.py
+++ b/lib/iris/coord_categorisation.py
@@ -93,7 +93,7 @@ def vectorised_fn(*args):
 # Private "helper" function
 def _pt_date(coord, time):
     """
-    Return the date of a time-coordinate point.
+    Return the datetime of a time-coordinate point.
 
     Args:
 
@@ -103,14 +103,11 @@ def _pt_date(coord, time):
         value of a coordinate point
 
     Returns:
-        datetime.date
+        cftime.datetime
     """
     # NOTE: All of the currently defined categorisation functions are
     # calendar operations on Time coordinates.
-    #  - All these currently depend on Unit::num2date, which is deprecated (!!)
-    #  - We will want to do better, when we sort out our own Calendars.
-    #  - For now, just make sure these all call through this one function.
-    return coord.units.num2date(time)
+    return coord.units.num2date(time, only_use_cftime_datetimes=True)
 
 
 # --------------------------------------------

From cc1ef75c879662fabed5d15a9593bdbea7f6520b Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 25 May 2021 15:18:59 +0100
Subject: [PATCH 10/10] fix link

---
 .cirrus.yml                         |  2 +-
 lib/iris/fileformats/netcdf.py      |  4 ++--
 requirements/ci/nox.lock/Dockerfile | 36 -----------------------------
 3 files changed, 3 insertions(+), 39 deletions(-)
 delete mode 100644 requirements/ci/nox.lock/Dockerfile

diff --git a/.cirrus.yml b/.cirrus.yml
index 13105b13cc..bcf1c5cc25 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -87,7 +87,7 @@ linux_task_template: &LINUX_TASK_TEMPLATE
 # YAML alias for compute credits.
 #
 compute_credits_template: &CREDITS_TEMPLATE
-  # Only use credits for non-DRAFT pull-requests to SciTools/iris master branch by collaborators
+  # Only use credits for non-DRAFT pull-requests to a SciTools/iris branch by collaborators
   use_compute_credits: ${CIRRUS_REPO_FULL_NAME} == "SciTools/iris" && ${CIRRUS_USER_COLLABORATOR} == "true" && ${CIRRUS_PR_DRAFT} == "false" && ${CIRRUS_PR} != ""
 
 
diff --git a/lib/iris/fileformats/netcdf.py b/lib/iris/fileformats/netcdf.py
index bb7a870d58..2032f2349f 100644
--- a/lib/iris/fileformats/netcdf.py
+++ b/lib/iris/fileformats/netcdf.py
@@ -1043,7 +1043,7 @@ def write(
             dtype(i.e. 'i2', 'short', 'u4') or a dict of packing parameters as
             described below. This provides support for netCDF data packing as
             described in
-            http://www.unidata.ucar.edu/software/netcdf/docs/BestPractices.html#bp_Packed-Data-Values
+            https://www.unidata.ucar.edu/software/netcdf/documentation/NUG/best_practices.html#bp_Packed-Data-Values
             If this argument is a type (or type string), appropriate values of
             scale_factor and add_offset will be automatically calculated based
             on `cube.data` and possible masking. For more control, pass a dict
@@ -2589,7 +2589,7 @@ def save(
         (i.e. 'i2', 'short', 'u4') or a dict of packing parameters as described
         below or an iterable of such types, strings, or dicts.
         This provides support for netCDF data packing as described in
-        http://www.unidata.ucar.edu/software/netcdf/docs/BestPractices.html#bp_Packed-Data-Values
+        https://www.unidata.ucar.edu/software/netcdf/documentation/NUG/best_practices.html#bp_Packed-Data-Values
         If this argument is a type (or type string), appropriate values of
         scale_factor and add_offset will be automatically calculated based
         on `cube.data` and possible masking. For more control, pass a dict with
diff --git a/requirements/ci/nox.lock/Dockerfile b/requirements/ci/nox.lock/Dockerfile
deleted file mode 100644
index a989859356..0000000000
--- a/requirements/ci/nox.lock/Dockerfile
+++ /dev/null
@@ -1,36 +0,0 @@
-FROM condaforge/mambaforge:latest
-
-LABEL author="scitools" \
-      version="0.1" \
-      description="SciTools Cirrus-CI mambaforge image"
-
-# python version in "<major><minor>" format e.g., "38"
-ARG PY_VER
-
-ENV WORK_DIR="/root/scitools" \
-    LOCK_FILE="/root/scitools/iris.lock" \
-    NOX_DIR="/root/scitools/.nox" \
-    ENV_DIR="/root/scitools/.nox/tests" \
-    TMP_DIR="/root/scitools/.nox/tests/tmp"
-
-# configure conda and install conda-lock et al
-RUN conda config --set always_yes yes \
-  && conda config --set changeps1 no \
-  && conda config --set show_channel_urls True \
-  && conda config --add channels conda-forge \
-  && conda update --quiet --name base conda \
-  && mamba install --yes --quiet --channel conda-forge --name base conda-lock nox pip setuptools wheel
-
-# populate work directory with lock file from docker context
-WORKDIR ${WORK_DIR}
-COPY ./py${PY_VER}-linux-64.lock ${LOCK_FILE}
-
-# install the lock packages into the nox workspace and
-# configure the required nox environments
-RUN mkdir -p ${ENV_DIR} \
-  && mamba install --quiet --prefix ${ENV_DIR} --file ${LOCK_FILE} \
-  && ln -s ${ENV_DIR} ${NOX_DIR}/gallery \
-  && ln -s ${ENV_DIR} ${NOX_DIR}/doctest \
-  && ln -s ${ENV_DIR} ${NOX_DIR}/linkcheck \
-  && mkdir -p ${TMP_DIR} \
-  && sha256sum ${LOCK_FILE} | cut -d' ' -f1 > ${TMP_DIR}/py${PY_VER}.yml