$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-collections.git /var/lib/mock/f40-build-2193276-51471/root/chroot_tmpdir/scmroot/apache-commons-collections
Cloning into '/var/lib/mock/f40-build-2193276-51471/root/chroot_tmpdir/scmroot/apache-commons-collections'...
$ git fetch origin ec3953c59eee11edbfc048afcbb11972f05b25be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-collections
 * [new ref]         ec3953c59eee11edbfc048afcbb11972f05b25be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec3953c Update javapackages test plan to f40