$ git clone -n https://src.fedoraproject.org/rpms/ktechlab.git /var/lib/mock/f42-build-881556-183612/root/chroot_tmpdir/scmroot/ktechlab
Cloning into '/var/lib/mock/f42-build-881556-183612/root/chroot_tmpdir/scmroot/ktechlab'...
$ git fetch origin af3f5ce8d1ad7f391e773fade640a4223a5d1996:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ktechlab
 * [new ref]         af3f5ce8d1ad7f391e773fade640a4223a5d1996 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af3f5ce Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild