$ git clone -n https://src.fedoraproject.org/rpms/ibus-cangjie.git /var/lib/mock/f41-build-side-1-2878685-34445/root/chroot_tmpdir/scmroot/ibus-cangjie
Cloning into '/var/lib/mock/f41-build-side-1-2878685-34445/root/chroot_tmpdir/scmroot/ibus-cangjie'...
$ git fetch origin 9539403d48dca80b57077877dc55c0ef1a760214:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ibus-cangjie
 * [new ref]         9539403d48dca80b57077877dc55c0ef1a760214 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9539403 Empty commit to trick autorelease