$ git clone -n https://src.fedoraproject.org/rpms/ghc-fast-logger.git /var/lib/mock/f41-build-side-1-2908477-34741/root/chroot_tmpdir/scmroot/ghc-fast-logger
Cloning into '/var/lib/mock/f41-build-side-1-2908477-34741/root/chroot_tmpdir/scmroot/ghc-fast-logger'...
$ git fetch origin cbd9439fc73e09372da3c553ce848d49fd011864:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-fast-logger
 * [new ref]         cbd9439fc73e09372da3c553ce848d49fd011864 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbd9439 redisable testsuite