Trac #29105: tox.ini, build/bin/write-dockerfile.sh: Add gentoo linux…

…, add more gentoo packages

As a followup to #29053 and #29273, we
- extend `build/bin/write-dockerfile.sh` to generate a Dockerfile using
https://hub.docker.com/r/sheerluck/sage-on-gentoo-stage4
- add `build/pkgs/gentoo*.txt`
- extend `bin/sage-print-system-package-command` to handle gentoo
- add gentoo to the platforms tested in GitHub CI.

To test: `tox -e docker-gentoo-standard`

This is a part of:
- #29060: Meta-ticket: Add Dockerfiles and CI scripts for integration
testing of source and binary distributions and of downstream packages

-----------

Resources:
- https://forums.gentoo.org/viewtopic-t-969278-start-0.html
- cschwan/sage-on-gentoo: (Unofficial) Gentoo Overlay for Sage- and
Sage-related ebuilds: https://github.com/cschwan/sage-on-gentoo
- Project:Overlays/Old User Guide - Gentoo Wiki:
https://wiki.gentoo.org/wiki/Project:Overlays/Old_User_Guide
- Layman - Gentoo Wiki: https://wiki.gentoo.org/wiki/Layman

URL: https://trac.sagemath.org/29105
Reported by: mkoeppe
Ticket author(s): Andrey Belgorodski
Reviewer(s): Matthias Koeppe

.github/workflows/tox-optional.yml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       max-parallel: 6
       matrix:
-        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, centos-7, centos-8, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
+        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, centos-7, centos-8, gentoo, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [maximal]
     env:
       TOX_ENV: docker-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}

.github/workflows/tox.yml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       max-parallel: 20
       matrix:
-        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, centos-7, centos-8, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
+        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, centos-7, centos-8, gentoo, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [minimal, standard]
     env:
       TOX_ENV: docker-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}

build/bin/sage-print-system-package-command

@@ -58,6 +58,9 @@ case $system:$command in
     @(fedora*|redhat*|centos*):install)
         [ -n "$system_packages" ] && echo "${PROMPT}${SUDO}yum install $system_packages"
         ;;
+    gentoo*:install)
+        [ -n "$system_packages" ] && echo "${PROMPT}${SUDO}emerge $system_packages"
+        ;;
     arch*:install)
         [ -n "$system_packages" ] && echo "${PROMPT}${SUDO}pacman -S $system_packages"
         ;;

build/bin/write-dockerfile.sh

@@ -56,6 +56,15 @@ EOF
         EXISTS="2>/dev/null >/dev/null yum install -y --downloadonly"
         INSTALL="yum install -y"
         ;;
+    gentoo*)
+        cat <<EOF
+ARG BASE_IMAGE=sheerluck/sage-on-gentoo-stage4:latest
+FROM \${BASE_IMAGE} as with-system-packages
+EOF
+        EXISTS="2>/dev/null >/dev/null emerge -f"
+        UPDATE="" # not needed. "FROM gentoo/portage" used instead
+        INSTALL="emerge -DNut --with-bdeps=y --complete-graph=y"
+        ;;
     slackware*)
         # https://docs.slackware.com/slackbook:package_management
         cat <<EOF

build/pkgs/gentoo-bootstrap.txt

@@ -0,0 +1,3 @@
+sys-devel/autoconf
+sys-devel/automake
+sys-devel/libtool

build/pkgs/gentoo.txt

@@ -0,0 +1,22 @@
+sys-devel/binutils
+sys-libs/binutils-libs
+sys-devel/make
+dev-scheme/guile
+dev-libs/libffi
+app-arch/tar
+sys-devel/gcc
+dev-libs/mpc
+sys-libs/glibc
+sys-kernel/linux-headers
+dev-lang/perl
+sys-devel/m4
+sys-devel/bc
+dev-lang/python
+sys-devel/flex
+app-misc/ca-certificates
+sys-devel/gettext
+dev-libs/libcroco
+dev-libs/libxml2
+sys-apps/findutils
+sys-apps/which
+sys-apps/diffutils

tox.ini

@@ -191,6 +191,11 @@ setenv =
     centos-7:         BASE_TAG=centos7
     centos-8:         BASE_TAG=centos8
     #
+    # https://hub.docker.com/r/sheerluck/sage-on-gentoo-stage4/tags
+    #
+    gentoo:      SYSTEM=gentoo
+    gentoo:      BASE_IMAGE=sheerluck/sage-on-gentoo-stage4
+    #
     # https://hub.docker.com/_/archlinux/
     #
     archlinux:      SYSTEM=arch