$ git clone -n https://src.fedoraproject.org/rpms/mozc.git /var/lib/mock/f39-build-1936850-43130/root/chroot_tmpdir/scmroot/mozc
Cloning into '/var/lib/mock/f39-build-1936850-43130/root/chroot_tmpdir/scmroot/mozc'...
$ git fetch origin ba0ce9a887dacba70bd2f233e60ba8990ed7876f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mozc
 * [new ref]         ba0ce9a887dacba70bd2f233e60ba8990ed7876f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba0ce9a Bump release and fix changelog format