$ git clone -n https://src.fedoraproject.org/rpms/j4-dmenu-desktop.git /var/lib/mock/f40-build-2494574-61664/root/chroot_tmpdir/scmroot/j4-dmenu-desktop
Cloning into '/var/lib/mock/f40-build-2494574-61664/root/chroot_tmpdir/scmroot/j4-dmenu-desktop'...
$ git fetch origin 333ee65a7a9e5fdad2bbaa7b8414dd77373deb08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/j4-dmenu-desktop
 * [new ref]         333ee65a7a9e5fdad2bbaa7b8414dd77373deb08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 333ee65 Retired: Long term failure to build