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Fix ~/.cache ownership after the store restore #4

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Merged
mattrobenolt merged 1 commit into from
Nov 9, 2026
Merged

Fix ~/.cache ownership after the store restore #4

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14 changes: 14 additions & 0 deletions .github/actions/setup-nix/action.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -85,3 +85,17 @@ runs:
paths: |
~/.cache/nix
/nix

# The restore runs as root (it has to, for /nix) and extracts absolute
# paths, so ~/.cache is created owned by root. cache-nix-action fixes the
# permissions of ~/.cache/nix itself, not of its parent, and anything that
# creates a directory under ~/.cache then fails with AccessDenied. Zig is
# the one that bit us, with ~/.cache/zig.
- name: Fix ownership of the cache directory
if: ${{ inputs.cache == 'true' }}
shell: bash
run: |
set -euo pipefail
if [ -d "$HOME/.cache" ] && [ ! -w "$HOME/.cache" ]; then
sudo chown "$(id -u):$(id -g)" "$HOME/.cache"
fi
5 changes: 5 additions & 0 deletions .github/workflows/ci.yml
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Expand Up @@ -32,6 +32,11 @@ jobs:
- name: Check the devshell evaluates
run: nix develop .#dev --command nix --version

# Guards the restore, which extracts as root and would otherwise leave
# ~/.cache unwritable for tools that create a cache there.
- name: Check the user cache is writable
run: mkdir -p "$HOME/.cache/setup-nix-smoke" && rmdir "$HOME/.cache/setup-nix-smoke"

- name: Report cache
env:
CACHE_HIT: ${{ steps.nix.outputs.cache-hit }}
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