$ git clone -n https://src.fedoraproject.org/rpms/cargo2rpm.git /var/lib/mock/f39-build-1981677-43342/root/chroot_tmpdir/scmroot/cargo2rpm
Cloning into '/var/lib/mock/f39-build-1981677-43342/root/chroot_tmpdir/scmroot/cargo2rpm'...
$ git fetch origin a667604867273ab873ff6d84ad14bda02401f595:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cargo2rpm
 * [new ref]         a667604867273ab873ff6d84ad14bda02401f595 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a667604 Update to version 0.1.15; Fixes RHBZ#2253432