$ git clone -n https://src.fedoraproject.org/rpms/rust-linux-raw-sys.git /var/lib/mock/f42-build-side-1-3539520-46565/root/chroot_tmpdir/scmroot/rust-linux-raw-sys
Cloning into '/var/lib/mock/f42-build-side-1-3539520-46565/root/chroot_tmpdir/scmroot/rust-linux-raw-sys'...
$ git fetch origin f719594ba1918bc0bd0c2c47e90ee7b1d6cfbd94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-linux-raw-sys
 * [new ref]         f719594ba1918bc0bd0c2c47e90ee7b1d6cfbd94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f719594 Update to version 0.9.4; Fixes RHBZ#2352548