$ git clone -n https://src.fedoraproject.org/rpms/ghasher.git /var/lib/mock/f45-build-9882-411/root/chroot_tmpdir/scmroot/ghasher
Cloning into '/var/lib/mock/f45-build-9882-411/root/chroot_tmpdir/scmroot/ghasher'...
$ git fetch origin a3f2f577754c374f9988803ccdd13e4558f60122:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghasher
 * [new ref]         a3f2f577754c374f9988803ccdd13e4558f60122 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3f2f57 opt-in to packit for rawhide