$ git clone -n https://src.fedoraproject.org/rpms/objfw.git /var/lib/mock/f39-build-2437747-60811/root/chroot_tmpdir/scmroot/objfw
Cloning into '/var/lib/mock/f39-build-2437747-60811/root/chroot_tmpdir/scmroot/objfw'...
$ git fetch origin 9875996d7c15d19dfc2f46415b058f94e9eb762b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/objfw
 * [new ref]         9875996d7c15d19dfc2f46415b058f94e9eb762b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9875996 Merge branch 'main' into f39