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fix(nix): container entrypoint chown -R strips setgid, breaking hostUsers group access #23633

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Merged
alt-glitch merged 1 commit into from
May 11, 2026
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fix(nix): container entrypoint chown -R strips setgid, breaking hostUsers group access #23633

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8 changes: 6 additions & 2 deletions nix/nixosModules.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -115,9 +115,13 @@
chown "$HERMES_UID:$HERMES_GID" "$TARGET_HOME"
chmod 0750 "$TARGET_HOME"

# Ensure HERMES_HOME is owned by the target user
# Ensure HERMES_HOME is owned by the target user.
# Use find instead of chown -R: chown strips the setgid bit (kernel
# behavior), destroying the 2770 permissions the NixOS activation
# script sets for group access by hostUsers. Only touch files with
# wrong ownership so correctly-owned dirs keep their permission bits.
if [ -n "''${HERMES_HOME:-}" ] && [ -d "$HERMES_HOME" ]; then
chown -R "$HERMES_UID:$HERMES_GID" "$HERMES_HOME"
find "$HERMES_HOME" \! -user "$HERMES_UID" -exec chown "$HERMES_UID:$HERMES_GID" {} +
fi

# ── Provision apt packages (first boot only, cached in writable layer) ──
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