$ git clone -n https://src.fedoraproject.org/rpms/slrn.git /var/lib/mock/f41-build-814537-14252/root/chroot_tmpdir/scmroot/slrn
Cloning into '/var/lib/mock/f41-build-814537-14252/root/chroot_tmpdir/scmroot/slrn'...
$ git fetch origin 0a13a26e94411748079eb4dd86bf3e52f36d73cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/slrn
 * [new ref]         0a13a26e94411748079eb4dd86bf3e52f36d73cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a13a26 Eliminate use of obsolete %patchN syntax (#2283636)