Merge pull request #12050 from Mic92/ci

speed up ci by splitting off eval and build + fix ci with restricted namespaces

.github/workflows/ci.yml

@@ -7,6 +7,14 @@ on:
 permissions: read-all
 
 jobs:
+  eval:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - uses: cachix/install-nix-action@v30
+    - run: nix --experimental-features 'nix-command flakes' flake show --all-systems --json
 
   tests:
     needs: [check_secrets]
@@ -33,25 +41,11 @@ jobs:
         name: '${{ env.CACHIX_NAME }}'
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-    - if: matrix.os == 'ubuntu-latest'
-      run: |
-        free -h
-        swapon --show
-        swap=$(swapon --show --noheadings | head -n 1 | awk '{print $1}')
-        echo "Found swap: $swap"
-        sudo swapoff $swap
-        # resize it (fallocate)
-        sudo fallocate -l 10G $swap
-        sudo mkswap $swap
-        sudo swapon $swap
-        free -h
-        (
-          while sleep 60; do
-            free -h
-          done
-        ) &
-    - run: nix --experimental-features 'nix-command flakes' flake check -L
-    - run: nix --experimental-features 'nix-command flakes' flake show --all-systems --json
+    # Since ubuntu 22.30, unprivileged usernamespaces are no longer allowed to map to the root user:
+    # https://ubuntu.com/blog/ubuntu-23-10-restricted-unprivileged-user-namespaces
+    - run: sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
+      if: matrix.os == 'ubuntu-latest'
+    - run: scripts/build-checks
 
   # Steps to test CI automation in your own fork.
   # Cachix:

scripts/binary-tarball.nix

@@ -65,7 +65,7 @@ runCommand "nix-binary-tarball-${version}" env ''
   fn=$out/$dir.tar.xz
   mkdir -p $out/nix-support
   echo "file binary-dist $fn" >> $out/nix-support/hydra-build-products
-  tar cvfJ $fn \
+  tar cfJ $fn \
     --owner=0 --group=0 --mode=u+rw,uga+r \
     --mtime='1970-01-01' \
     --absolute-names \

scripts/build-checks

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+system=$(nix eval --raw --impure --expr builtins.currentSystem)
+nix eval --json ".#checks.$system" --apply builtins.attrNames | \
+  jq -r '.[]' | \
+  xargs -P0 -I '{}' sh -c "nix build -L .#checks.$system.{} || { echo 'FAILED: \033[0;31mnix build -L .#checks.$system.{}\\033[0m'; kill 0; }"