$ git clone -n https://src.fedoraproject.org/rpms/mate-media.git /var/lib/mock/f40-build-752706-116830/root/chroot_tmpdir/scmroot/mate-media
Cloning into '/var/lib/mock/f40-build-752706-116830/root/chroot_tmpdir/scmroot/mate-media'...
$ git fetch origin c751ad143725cf5c7bc32b7d5a7a50cd0025502b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-media
 * [new ref]         c751ad143725cf5c7bc32b7d5a7a50cd0025502b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c751ad1 fix building with libxml 2.12.0