$ git clone -n https://src.fedoraproject.org/rpms/maven-artifact-transfer.git /var/lib/mock/f41-build-1104841-20066/root/chroot_tmpdir/scmroot/maven-artifact-transfer
Cloning into '/var/lib/mock/f41-build-1104841-20066/root/chroot_tmpdir/scmroot/maven-artifact-transfer'...
$ git fetch origin 19b0a40bb2b621980e76725bf4f4da20d5977f6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-artifact-transfer
 * [new ref]         19b0a40bb2b621980e76725bf4f4da20d5977f6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19b0a40 Update Java source/target to 1.8