$ git clone -n https://src.fedoraproject.org/rpms/ruby-mecab.git /var/lib/mock/f40-build-777892-129619/root/chroot_tmpdir/scmroot/ruby-mecab
Cloning into '/var/lib/mock/f40-build-777892-129619/root/chroot_tmpdir/scmroot/ruby-mecab'...
$ git fetch origin 6a27f5a548800068935ce02f28d96edea2b30f5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby-mecab
 * [new ref]         6a27f5a548800068935ce02f28d96edea2b30f5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a27f5a bump release