$ git clone -n https://src.fedoraproject.org/rpms/libcgroup.git /var/lib/mock/f41-build-1028898-18369/root/chroot_tmpdir/scmroot/libcgroup
Cloning into '/var/lib/mock/f41-build-1028898-18369/root/chroot_tmpdir/scmroot/libcgroup'...
$ git fetch origin a17e902b4834379f785cbc2a6327c6a8906ad66b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcgroup
 * [new ref]         a17e902b4834379f785cbc2a6327c6a8906ad66b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a17e902 Eliminate use of obsolete %patchN syntax (#2283636)