$ git clone -n https://src.fedoraproject.org/rpms/gtts.git /var/lib/mock/f41-build-981128-17140/root/chroot_tmpdir/scmroot/gtts
Cloning into '/var/lib/mock/f41-build-981128-17140/root/chroot_tmpdir/scmroot/gtts'...
$ git fetch origin 9913a23f4545c62b3af23661f368811410832a7f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtts
 * [new ref]         9913a23f4545c62b3af23661f368811410832a7f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9913a23 2.5.1