$ git clone -n https://src.fedoraproject.org/rpms/qbs.git /var/lib/mock/f39-build-1468912-33813/root/chroot_tmpdir/scmroot/qbs
Cloning into '/var/lib/mock/f39-build-1468912-33813/root/chroot_tmpdir/scmroot/qbs'...
$ git fetch origin acd82d1fd2f5f417dd3598ab5c33b3145a55c8a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qbs
 * [new ref]         acd82d1fd2f5f417dd3598ab5c33b3145a55c8a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acd82d1 Rebuild (qt6)