$ git clone -n https://src.fedoraproject.org/rpms/rust-rend.git /var/lib/mock/f45-build-44392-813/root/chroot_tmpdir/scmroot/rust-rend
Cloning into '/var/lib/mock/f45-build-44392-813/root/chroot_tmpdir/scmroot/rust-rend'...
$ git fetch origin eefb33b10ba675eac25d7b238b59a417f237cf77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rend
 * [new ref]         eefb33b10ba675eac25d7b238b59a417f237cf77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eefb33b Simplify .gitignore