$ git clone -n https://src.fedoraproject.org/rpms/lsfrom.git /var/lib/mock/f39-build-1733381-41251/root/chroot_tmpdir/scmroot/lsfrom
Cloning into '/var/lib/mock/f39-build-1733381-41251/root/chroot_tmpdir/scmroot/lsfrom'...
$ git fetch origin 4574bdbe989637a38c7585e236e825c09f7a529d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lsfrom
 * [new ref]         4574bdbe989637a38c7585e236e825c09f7a529d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4574bdb bump release