$ git clone -n https://src.fedoraproject.org/rpms/xml-commons-resolver.git /var/lib/mock/f40-build-2158077-50939/root/chroot_tmpdir/scmroot/xml-commons-resolver
Cloning into '/var/lib/mock/f40-build-2158077-50939/root/chroot_tmpdir/scmroot/xml-commons-resolver'...
$ git fetch origin f0b68ba04823f67f0c1f49a9407f4ec19ac9d5c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xml-commons-resolver
 * [new ref]         f0b68ba04823f67f0c1f49a9407f4ec19ac9d5c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0b68ba Update javapackages test plan to f40