$ git clone -n https://src.fedoraproject.org/rpms/rust-cairo-sys-rs0.16.git /var/lib/mock/f38-build-side-43-rust-devel-1416821-31457/root/chroot_tmpdir/scmroot/rust-cairo-sys-rs0.16
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416821-31457/root/chroot_tmpdir/scmroot/rust-cairo-sys-rs0.16'...
$ git fetch origin f70027577f2ba91ed1818e70fbb88af6661c4772:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cairo-sys-rs0.16
 * [new ref]         f70027577f2ba91ed1818e70fbb88af6661c4772 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f700275 Initial import (cairo-sys-rs 0.16 compat package)