$ git clone -n https://src.fedoraproject.org/rpms/libirc.git /var/lib/mock/f43-build-58882505-6568958/root/chroot_tmpdir/scmroot/libirc
Cloning into '/var/lib/mock/f43-build-58882505-6568958/root/chroot_tmpdir/scmroot/libirc'...
$ git fetch origin b11793563e81e37ef4ca34b90a7554b35f557e21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libirc
 * [new ref]         b11793563e81e37ef4ca34b90a7554b35f557e21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b117935 Compatibility with CMake 4.0