$ git clone -n https://src.fedoraproject.org/rpms/jss.git /var/lib/mock/f40-build-1626215-24118/root/chroot_tmpdir/scmroot/jss
Cloning into '/var/lib/mock/f40-build-1626215-24118/root/chroot_tmpdir/scmroot/jss'...
$ git fetch origin dea6fb86d3e65916f8d53d851a72cd055b4f350a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jss
 * [new ref]         dea6fb86d3e65916f8d53d851a72cd055b4f350a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dea6fb8 Rebuilt for java-21-openjdk as system jdk