$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-actor.git /var/lib/mock/f40-build-1858809-24992/root/chroot_tmpdir/scmroot/rust-gix-actor
Cloning into '/var/lib/mock/f40-build-1858809-24992/root/chroot_tmpdir/scmroot/rust-gix-actor'...
$ git fetch origin a1dbf53653c853e463b89718b092d74e530c01b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-actor
 * [new ref]         a1dbf53653c853e463b89718b092d74e530c01b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1dbf53 Update to version 0.31.5 (rhbz#2299558)