$ git clone -n https://src.fedoraproject.org/rpms/jgit.git /var/lib/mock/f40-build-2446861-61325/root/chroot_tmpdir/scmroot/jgit
Cloning into '/var/lib/mock/f40-build-2446861-61325/root/chroot_tmpdir/scmroot/jgit'...
$ git fetch origin 21c5a6647f45482c54fec5744989d36bb52ba78f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jgit
 * [new ref]         21c5a6647f45482c54fec5744989d36bb52ba78f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21c5a66 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild