$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-revision.git /var/lib/mock/f40-build-1858911-24992/root/chroot_tmpdir/scmroot/rust-gix-revision
Cloning into '/var/lib/mock/f40-build-1858911-24992/root/chroot_tmpdir/scmroot/rust-gix-revision'...
$ git fetch origin 1bec027b075e8fe542ca7ad84306b55da828d526:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-revision
 * [new ref]         1bec027b075e8fe542ca7ad84306b55da828d526 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bec027 Update to version 0.27.2 (rhbz#2299585)