$ git clone -n https://src.fedoraproject.org/rpms/jctools.git /var/lib/mock/f40-build-2494648-61664/root/chroot_tmpdir/scmroot/jctools
Cloning into '/var/lib/mock/f40-build-2494648-61664/root/chroot_tmpdir/scmroot/jctools'...
$ git fetch origin 2a17556618f1cba0a23f2bab6b5522f65d4ffa97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jctools
 * [new ref]         2a17556618f1cba0a23f2bab6b5522f65d4ffa97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2a17556 Rebuilt for java-21-openjdk as system jdk