$ git clone -n https://src.fedoraproject.org/rpms/ghc-concurrent-output.git /var/lib/mock/f40-build-2286086-55702/root/chroot_tmpdir/scmroot/ghc-concurrent-output
Cloning into '/var/lib/mock/f40-build-2286086-55702/root/chroot_tmpdir/scmroot/ghc-concurrent-output'...
$ git fetch origin f54571d4f28d094b6d30672207f45ea82d1c9306:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concurrent-output
 * [new ref]         f54571d4f28d094b6d30672207f45ea82d1c9306 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f54571d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild