$ git clone -n https://src.fedoraproject.org/rpms/rust-qstring.git /var/lib/mock/f40-build-2038957-48224/root/chroot_tmpdir/scmroot/rust-qstring
Cloning into '/var/lib/mock/f40-build-2038957-48224/root/chroot_tmpdir/scmroot/rust-qstring'...
$ git fetch origin a6450bb34e2f816533966499e4521d83b6eaaaf1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-qstring
 * [new ref]         a6450bb34e2f816533966499e4521d83b6eaaaf1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6450bb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild