$ git clone -n https://src.fedoraproject.org/rpms/castxml.git /var/lib/mock/f40-build-2649716-66861/root/chroot_tmpdir/scmroot/castxml
Cloning into '/var/lib/mock/f40-build-2649716-66861/root/chroot_tmpdir/scmroot/castxml'...
$ git fetch origin fe7e06e92f2dd55b2f5d58afd0b4b664c6e84abb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/castxml
 * [new ref]         fe7e06e92f2dd55b2f5d58afd0b4b664c6e84abb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe7e06e Backport LLVM 18 support from upstream