$ git clone -n https://src.fedoraproject.org/rpms/rust-sha1_smol.git /var/lib/mock/f39-build-1517140-35689/root/chroot_tmpdir/scmroot/rust-sha1_smol
Cloning into '/var/lib/mock/f39-build-1517140-35689/root/chroot_tmpdir/scmroot/rust-sha1_smol'...
$ git fetch origin cfdf157ff61137e0198c8f422bde0db73a0ce531:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha1_smol
 * [new ref]         cfdf157ff61137e0198c8f422bde0db73a0ce531 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfdf157 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild