$ git clone -n https://src.fedoraproject.org/rpms/rust-grep-searcher.git /var/lib/mock/f39-build-1521727-35856/root/chroot_tmpdir/scmroot/rust-grep-searcher
Cloning into '/var/lib/mock/f39-build-1521727-35856/root/chroot_tmpdir/scmroot/rust-grep-searcher'...
$ git fetch origin 53581c2b7c92d77e87d5d7922ff69ba9d620eed0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-grep-searcher
 * [new ref]         53581c2b7c92d77e87d5d7922ff69ba9d620eed0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53581c2 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild