$ git clone -n https://src.fedoraproject.org/rpms/xapian-core.git /var/lib/mock/f41-build-848919-164618/root/chroot_tmpdir/scmroot/xapian-core
Cloning into '/var/lib/mock/f41-build-848919-164618/root/chroot_tmpdir/scmroot/xapian-core'...
$ git fetch origin 6e43e58a2ba7375a5ba0e099bc612d8fba652867:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xapian-core
 * [new ref]         6e43e58a2ba7375a5ba0e099bc612d8fba652867 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e43e58 1.4.26