$ git clone -n https://src.fedoraproject.org/rpms/gperftools.git /var/lib/mock/f40-build-754292-117632/root/chroot_tmpdir/scmroot/gperftools
Cloning into '/var/lib/mock/f40-build-754292-117632/root/chroot_tmpdir/scmroot/gperftools'...
$ git fetch origin e80c435217c1c33f46b0522ab1b3c17b53e5e44b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gperftools
 * [new ref]         e80c435217c1c33f46b0522ab1b3c17b53e5e44b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e80c435 fix spacing