$ git clone -n https://src.fedoraproject.org/rpms/rust-oxipng.git /var/lib/mock/f40-build-781170-131438/root/chroot_tmpdir/scmroot/rust-oxipng
Cloning into '/var/lib/mock/f40-build-781170-131438/root/chroot_tmpdir/scmroot/rust-oxipng'...
$ git fetch origin ce598bd8e7876b71d22aaea0c5afd393fc4ffe21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-oxipng
 * [new ref]         ce598bd8e7876b71d22aaea0c5afd393fc4ffe21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce598bd Unretire and update to 9.0.0 (close RHBZ#2259760)