ci: refactor crosstool-ng to use mini-defconfig

src/ci/docker/README.md

@@ -83,12 +83,12 @@ To run the image,
 A number of these images take quite a long time to compile as they're building
 whole gcc toolchains to do cross builds with. Much of this is relatively
 self-explanatory but some images use [crosstool-ng] which isn't quite as self
-explanatory. Below is a description of where these `*.config` files come form,
+explanatory. Below is a description of where these `*.defconfig` files come form,
 how to generate them, and how the existing ones were generated.
 
 [crosstool-ng]: https://github.com/crosstool-ng/crosstool-ng
 
-### Generating a `.config` file
+### Generating a `.defconfig` file
 
 **NOTE:** Existing Dockerfiles can also be a good guide for the process and order
 of script execution.
@@ -100,14 +100,14 @@ next two steps.
   these steps are outside the container:
 
 ```
-# Note: We use ubuntu:16.04 because that's the "base" of linux-cross Docker
+# Note: We use ubuntu:22.04 because that's the "base" of linux-cross Docker
 # image, or simply run ./src/ci/docker/run.sh once, which will download the correct
 # one and you can check it out with `docker images`
-$ docker run -it ubuntu:16.04 bash
+$ docker run -it ubuntu:22.04 bash
 # in another terminal:
 $ docker ps
 CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
-cfbec05ed730        ubuntu:16.04        "bash"              16 seconds ago      Up 15 seconds                           drunk_murdock
+cfbec05ed730        ubuntu:22.04        "bash"              16 seconds ago      Up 15 seconds                           drunk_murdock
 $ docker cp src/ci/docker/scripts drunk_murdock:/tmp/
 ```
 
@@ -127,7 +127,7 @@ $ bash ./crosstool-ng.sh
   present. Otherwise one can use the TUI to load any config-file.
 
 ```
-$ docker cp arm-linux-gnueabi.config drunk_murdock:/tmp/.config
+$ docker cp arm-linux-gnueabi.defconfig drunk_murdock:/tmp/.config
 ```
 
 - Now, inside the container run the following command to configure the
@@ -136,29 +136,31 @@ $ docker cp arm-linux-gnueabi.config drunk_murdock:/tmp/.config
 
 ```
 $ cd /tmp/
+$ ct-ng olddefconfig
 $ ct-ng menuconfig
+$ ct-ng savedefconfig
 ```
 
-- Finally, we retrieve the `.config` file from the container and give it a
+- Finally, we retrieve the `defconfig` file from the container and give it a
   meaningful name. This is done outside the container.
 
 ```
-$ docker cp drunk_murdock:/tmp/.config arm-linux-gnueabi.config
+$ docker cp drunk_murdock:/tmp/defconfig arm-linux-gnueabi.defconfig
 ```
 
 - Now you can shutdown the container or repeat the two last steps to generate a
-  new `.config` file.
+  new `.defconfig` file.
 
 ### Toolchain configuration
 
 Changes on top of the default toolchain configuration used to generate the
-`.config` files in this directory. The changes are formatted as follows:
+`.defconfig` files in this directory. The changes are formatted as follows:
 
 ```
 $category > $option = $value -- $comment
 ```
 
-### `arm-linux-gnueabi.config`
+### `arm-linux-gnueabi.defconfig`
 
 For targets: `arm-unknown-linux-gnueabi`
 
@@ -175,7 +177,7 @@ For targets: `arm-unknown-linux-gnueabi`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `arm-linux-gnueabihf.config`
+### `arm-linux-gnueabihf.defconfig`
 
 For targets: `arm-unknown-linux-gnueabihf`
 
@@ -194,7 +196,7 @@ For targets: `arm-unknown-linux-gnueabihf`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `armv7-linux-gnueabihf.config`
+### `armv7-linux-gnueabihf.defconfig`
 
 For targets: `armv7-unknown-linux-gnueabihf`
 
@@ -220,7 +222,7 @@ For targets: `armv7-unknown-linux-gnueabihf`
     libraries like jemalloc. See the mk/cfg/arm(v7)-unknown-linux-gnueabi{,hf}.mk
     file in Rust's source code.
 
-### `aarch64-linux-gnu.config`
+### `aarch64-linux-gnu.defconfig`
 
 For targets: `aarch64-unknown-linux-gnu`
 
@@ -236,7 +238,7 @@ For targets: `aarch64-unknown-linux-gnu`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `i586-linux-gnu.config`
+### `i586-linux-gnu.defconfig`
 
 For targets: `i586-unknown-linux-gnu`
 
@@ -255,7 +257,7 @@ For targets: `i586-unknown-linux-gnu`
 (\*) Compressed debug is enabled by default for gas (assembly) on Linux/x86 targets,
      but that makes our `compiler_builtins` incompatible with binutils < 2.32.
 
-### `mips-linux-gnu.config`
+### `mips-linux-gnu.defconfig`
 
 For targets: `mips-unknown-linux-gnu`
 
@@ -277,7 +279,7 @@ For targets: `mips-unknown-linux-gnu`
 - C compiler > gcc extra config = --with-fp-32=xx --with-odd-spreg-32=no
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `mipsel-linux-gnu.config`
+### `mipsel-linux-gnu.defconfig`
 
 For targets: `mipsel-unknown-linux-gnu`
 
@@ -299,7 +301,7 @@ For targets: `mipsel-unknown-linux-gnu`
 - C compiler > gcc extra config = --with-fp-32=xx --with-odd-spreg-32=no
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `mips64-linux-gnu.config`
+### `mips64-linux-gnu.defconfig`
 
 For targets: `mips64-unknown-linux-gnuabi64`
 
@@ -320,7 +322,7 @@ For targets: `mips64-unknown-linux-gnuabi64`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `mips64el-linux-gnu.config`
+### `mips64el-linux-gnu.defconfig`
 
 For targets: `mips64el-unknown-linux-gnuabi64`
 
@@ -341,7 +343,7 @@ For targets: `mips64el-unknown-linux-gnuabi64`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `powerpc-linux-gnu.config`
+### `powerpc-linux-gnu.defconfig`
 
 For targets: `powerpc-unknown-linux-gnu`
 
@@ -357,7 +359,7 @@ For targets: `powerpc-unknown-linux-gnu`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `powerpc64-linux-gnu.config`
+### `powerpc64-linux-gnu.defconfig`
 
 For targets: `powerpc64-unknown-linux-gnu`
 
@@ -377,7 +379,7 @@ For targets: `powerpc64-unknown-linux-gnu`
 
 (+) These CPU options match the configuration of the toolchains in RHEL6.
 
-### `riscv64-unknown-linux-gnu.config`
+### `riscv64-unknown-linux-gnu.defconfig`
 
 For targets: `riscv64-unknown-linux-gnu`
 
@@ -393,7 +395,7 @@ For targets: `riscv64-unknown-linux-gnu`
 - C compiler > gcc version = 8.5.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-### `s390x-linux-gnu.config`
+### `s390x-linux-gnu.defconfig`
 
 For targets: `s390x-unknown-linux-gnu`
 

src/ci/docker/host-x86_64/dist-aarch64-linux/Dockerfile

@@ -8,13 +8,11 @@ RUN sh /scripts/crosstool-ng.sh
 
 COPY scripts/rustbuild-setup.sh /scripts/
 RUN sh /scripts/rustbuild-setup.sh
-USER rustbuild
 WORKDIR /tmp
 
-COPY host-x86_64/dist-aarch64-linux/aarch64-linux-gnu.config host-x86_64/dist-aarch64-linux/build-toolchains.sh /tmp/
-RUN ./build-toolchains.sh
-
-USER root
+COPY scripts/crosstool-ng-build.sh /scripts/
+COPY host-x86_64/dist-aarch64-linux/aarch64-linux-gnu.defconfig /tmp/crosstool.defconfig
+RUN /scripts/crosstool-ng-build.sh
 
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh