$ git clone -n https://src.fedoraproject.org/rpms/tcltls.git /var/lib/mock/f42-build-3282383-41398/root/chroot_tmpdir/scmroot/tcltls
Cloning into '/var/lib/mock/f42-build-3282383-41398/root/chroot_tmpdir/scmroot/tcltls'...
$ git fetch origin 367891dc8ecf5f0c122846b20b8181a858e634bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcltls
 * [new ref]         367891dc8ecf5f0c122846b20b8181a858e634bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 367891d Rebuilt for tcl/tk