$ git clone -n https://src.fedoraproject.org/rpms/guile-reader.git /var/lib/mock/f40-build-2546484-61907/root/chroot_tmpdir/scmroot/guile-reader
Cloning into '/var/lib/mock/f40-build-2546484-61907/root/chroot_tmpdir/scmroot/guile-reader'...
$ git fetch origin 16828cc7ffc96f26edc9025e999cc2f52fee729b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile-reader
 * [new ref]         16828cc7ffc96f26edc9025e999cc2f52fee729b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16828cc Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild