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# Shell-script fragment that packs a Nix store closure into a read-only erofs
# image, built on the host when the VM starts. Shared by the VM backends
# `qemu-vm.nix` and `vz-vm.nix`
{
hostPkgs,
# path to a file listing the store paths to pack, one per line
storePaths,
# filesystem label of the image
label,
# shell word the image is written to
destination,
}:
''
${hostPkgs.gnutar}/bin/tar --create \
--absolute-names \
--verbatim-files-from \
--transform 'flags=rSh;s|/nix/store/||' \
--transform 'flags=rSh;s|~nix~case~hack~[[:digit:]]\+||g' \
--files-from ${storePaths} \
| ${hostPkgs.erofs-utils}/bin/mkfs.erofs \
--quiet \
--force-uid=0 \
--force-gid=0 \
-L ${label} \
-U eb176051-bd15-49b7-9e6b-462e0b467019 \
-T 0 \
--hard-dereference \
--tar=f \
${destination}
''
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