$ git clone -n https://src.fedoraproject.org/rpms/libunicode.git /var/lib/mock/f40-build-2264667-54569/root/chroot_tmpdir/scmroot/libunicode
Cloning into '/var/lib/mock/f40-build-2264667-54569/root/chroot_tmpdir/scmroot/libunicode'...
$ git fetch origin a3aa935d44343f6bcb321b20ce7d8dfa170db7a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libunicode
 * [new ref]         a3aa935d44343f6bcb321b20ce7d8dfa170db7a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3aa935 fix