$ git clone -n https://src.fedoraproject.org/rpms/meld.git /var/lib/mock/f42-build-side-1-3501693-45976/root/chroot_tmpdir/scmroot/meld
Cloning into '/var/lib/mock/f42-build-side-1-3501693-45976/root/chroot_tmpdir/scmroot/meld'...
$ git fetch origin 139ba2e07204d83f830e0bad3c3f77df70dfb5f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/meld
 * [new ref]         139ba2e07204d83f830e0bad3c3f77df70dfb5f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 139ba2e New upstream release 3.23.0 (RHBZ#2354309)