$ git clone -n https://src.fedoraproject.org/rpms/ibus-m17n.git /var/lib/mock/f39-build-1578747-38006/root/chroot_tmpdir/scmroot/ibus-m17n
Cloning into '/var/lib/mock/f39-build-1578747-38006/root/chroot_tmpdir/scmroot/ibus-m17n'...
$ git fetch origin dc83dd130d93eceebd1431d687973bb8c9efad37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ibus-m17n
 * [new ref]         dc83dd130d93eceebd1431d687973bb8c9efad37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc83dd1 Update to 1.4.23