Add meson-based CI run for Gentoo

.devcontainer/onCreate-meson.sh

@@ -9,6 +9,26 @@ if [ "$SYSTEM" = "fedora" ]; then
     # Mitigate upstream packaging bug: https://bugzilla.redhat.com/show_bug.cgi?id=2332429
     # by swapping the incorrectly installed OpenCL-ICD-Loader for the expected ocl-icd
     dnf5 -y swap --repo='fedora' OpenCL-ICD-Loader ocl-icd
+elif [ "$SYSTEM" = "gentoo" ]; then
+    # Configure Portage
+    mkdir -p /etc/portage/package.accept_keywords /etc/portage/package.use
+    cat > /etc/portage/package.accept_keywords/sage <<'EOF'
+media-gfx/tachyon ~amd64
+media-libs/qhull ~amd64
+sci-libs/m4ri ~amd64
+sci-libs/m4rie ~amd64
+EOF
+    cat > /etc/portage/package.use/sage <<'EOF'
+sci-libs/cddlib tools
+sci-mathematics/eclib flint
+sci-mathematics/flint ntl
+sci-mathematics/lcalc pari
+sci-libs/brial png
+sci-libs/m4ri png
+sci-mathematics/maxima ecl
+media-libs/qhull tools
+media-libs/libglvnd X
+EOF
 fi
 
 eval $(build/bin/sage-print-system-package-command $SYSTEM "$@" update)

.devcontainer/portability-gentoo/Dockerfile

@@ -0,0 +1,7 @@
+FROM gentoo/portage:latest AS portage
+FROM gentoo/stage3:latest
+
+# Copy the entire portage volume in
+COPY --from=portage /var/db/repos/gentoo /var/db/repos/gentoo
+
+RUN emerge -qv dev-vcs/git dev-lang/python

.devcontainer/portability-gentoo/devcontainer.json

@@ -0,0 +1,22 @@
+// See https://aka.ms/devcontainer.json for format details.
+{
+    "name": "Gentoo",
+    //"image": "gentoo/stage3:latest",
+    "dockerFile": "Dockerfile",
+    "onCreateCommand": ".devcontainer/onCreate-meson.sh || true",
+    "features": {
+        // Git and Python features are not compatible with Gentoo, so we install it manually in the Dockerfile 
+        //"ghcr.io/devcontainers/features/git": {},
+        //"ghcr.io/devcontainers/features/python:1": {},
+        "../uv": {
+			"version": "latest"
+		}
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-python.python"
+            ]
+        }
+    }
+}

.github/workflows/ci.yml

@@ -20,6 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         container:
+          - gentoo/stage3:latest
           - fedora:41
           - fedora:42
           - ghcr.io/void-linux/void-glibc-full
@@ -37,6 +38,11 @@ jobs:
             xbps-install -yu
             # node-based actions require libstdc++.so.6
             xbps-install -Sy libstdc++ bash git
+          elif [ "${{ matrix.container }}" = "gentoo/stage3:latest" ]; then
+            # Setup portage
+            getuto
+            emerge-webrsync
+            emerge --sync
           fi
 
       - name: Checkout code
@@ -67,6 +73,26 @@ jobs:
               # Mitigate upstream packaging bug: https://bugzilla.redhat.com/show_bug.cgi?id=2332429
               # by swapping the incorrectly installed OpenCL-ICD-Loader for the expected ocl-icd
               dnf -y swap --repo='fedora' OpenCL-ICD-Loader ocl-icd
+          elif [ "$SYSTEM" = "gentoo" ]; then
+              # Configure Portage
+              mkdir -p /etc/portage/package.accept_keywords /etc/portage/package.use
+              cat > /etc/portage/package.accept_keywords/sage <<'EOF'
+          media-gfx/tachyon ~amd64
+          media-libs/qhull ~amd64
+          sci-libs/m4ri ~amd64
+          sci-libs/m4rie ~amd64
+          EOF
+              cat > /etc/portage/package.use/sage <<'EOF'
+          sci-libs/cddlib tools
+          sci-mathematics/eclib flint
+          sci-mathematics/flint ntl
+          sci-mathematics/lcalc pari
+          sci-libs/brial png
+          sci-libs/m4ri png
+          sci-mathematics/maxima ecl
+          media-libs/qhull tools
+          media-libs/libglvnd X
+          EOF
           fi
 
           eval $(build/bin/sage-print-system-package-command $SYSTEM update)

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

@@ -157,6 +157,9 @@ case $system:$command in
         [ "$IGNORE_MISSING" = yes ] && options="$options --skip-unavailable"
         [ -n "$system_packages" ] && print_shell_command ${SUDO}dnf install $options $system_packages
         ;;
+    gentoo*:update)
+        print_shell_command ${SUDO}emerge --sync
+        ;;
     gentoo*:install)
         [ -n "$system_packages" ] && print_shell_command ${SUDO}emerge $system_packages
         ;;