$ git clone -n https://src.fedoraproject.org/rpms/ssmtp.git /var/lib/mock/f42-build-400-66/root/chroot_tmpdir/scmroot/ssmtp
Cloning into '/var/lib/mock/f42-build-400-66/root/chroot_tmpdir/scmroot/ssmtp'...
$ git fetch origin 5694733732ba038a46f478c31a3c296da9070bac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ssmtp
 * [new ref]         5694733732ba038a46f478c31a3c296da9070bac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5694733 C23 compatibility fix (resolves rhbz#2341386)