$ git clone -n https://src.fedoraproject.org/rpms/ags.git /var/lib/mock/f42-build-side-1-3500326-45970/root/chroot_tmpdir/scmroot/ags
Cloning into '/var/lib/mock/f42-build-side-1-3500326-45970/root/chroot_tmpdir/scmroot/ags'...
$ git fetch origin 852fd598b638d02a436a9a5c2b18bef4988ae7a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ags
 * [new ref]         852fd598b638d02a436a9a5c2b18bef4988ae7a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 852fd59 update to 3.6.2.7