$ git clone -n https://src.fedoraproject.org/rpms/rust-darling0.13.git /var/lib/mock/f40-build-2054138-49105/root/chroot_tmpdir/scmroot/rust-darling0.13
Cloning into '/var/lib/mock/f40-build-2054138-49105/root/chroot_tmpdir/scmroot/rust-darling0.13'...
$ git fetch origin ec239781dc7e4bde298280645f2ffb702aca422c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-darling0.13
 * [new ref]         ec239781dc7e4bde298280645f2ffb702aca422c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec23978 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild