$ git clone -n https://src.fedoraproject.org/rpms/js-jsroot.git /var/lib/mock/f45-build-14503-461/root/chroot_tmpdir/scmroot/js-jsroot
Cloning into '/var/lib/mock/f45-build-14503-461/root/chroot_tmpdir/scmroot/js-jsroot'...
$ git fetch origin a8dcb2ed352d7fafdacd9cacb528895baf67c62a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/js-jsroot
 * [new ref]         a8dcb2ed352d7fafdacd9cacb528895baf67c62a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8dcb2e Update to version 7.11.1