$ git clone -n https://src.fedoraproject.org/rpms/maven-enforcer.git /var/lib/mock/f42-build-3357762-45030/root/chroot_tmpdir/scmroot/maven-enforcer
Cloning into '/var/lib/mock/f42-build-3357762-45030/root/chroot_tmpdir/scmroot/maven-enforcer'...
$ git fetch origin bc3c219a214e9e2e55efdc5e144c51524994fea9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-enforcer
 * [new ref]         bc3c219a214e9e2e55efdc5e144c51524994fea9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc3c219 Remove javadoc subpackage