Restore squashfs support with a dubious kludge

[nixos-qemu-vm-isolation] / modules / libblkid-squashfs-nix-store-kludge.patch

# This dubious kludge results from
# https://github.com/NixOS/nixpkgs/pull/236656 requiring filesystems to have labels and
# https://github.com/plougher/squashfs-tools/issues/59 squashfs not supporting labels.
diff --git a/libblkid/src/superblocks/squashfs.c b/libblkid/src/superblocks/squashfs.c
index 4db842493..ed7465882 100644
--- a/libblkid/src/superblocks/squashfs.c
+++ b/libblkid/src/superblocks/squashfs.c
@@ -45,6 +45,11 @@ static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag)
 
 	blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin);
 
+	{
+		char label_kludge[] = "nix-store";
+		blkid_probe_set_label(pr, label_kludge, sizeof(label_kludge));
+	}
+
 	return 0;
 }