$ git clone -n https://src.fedoraproject.org/rpms/yash.git /var/lib/mock/f38-build-715997-95769/root/chroot_tmpdir/scmroot/yash
Cloning into '/var/lib/mock/f38-build-715997-95769/root/chroot_tmpdir/scmroot/yash'...
$ git fetch origin 1af1c73af6c8bcf528510f449c53600922700e4b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yash
 * [new ref]         1af1c73af6c8bcf528510f449c53600922700e4b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1af1c73 2.54