$ git clone -n https://src.fedoraproject.org/rpms/texlive-collection-langjapanese.git /var/lib/mock/f45-bootstrap-190-117/root/chroot_tmpdir/scmroot/texlive-collection-langjapanese
Cloning into '/var/lib/mock/f45-bootstrap-190-117/root/chroot_tmpdir/scmroot/texlive-collection-langjapanese'...
$ git fetch origin a61ca1950a4c935260e2c1cdd082d066a1c71438:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/texlive-collection-langjapanese
 * [new ref]         a61ca1950a4c935260e2c1cdd082d066a1c71438 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a61ca19 Drop unpackaged "optional" dependency on bxdvipdfmx-tounicode.sty