$ git clone -n https://src.fedoraproject.org/rpms/rust-libphosh-sys.git /var/lib/mock/f42-build-3364882-45045/root/chroot_tmpdir/scmroot/rust-libphosh-sys
Cloning into '/var/lib/mock/f42-build-3364882-45045/root/chroot_tmpdir/scmroot/rust-libphosh-sys'...
$ git fetch origin 6177f5d861a93a6699397d02b5698c72ff19cb09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libphosh-sys
 * [new ref]         6177f5d861a93a6699397d02b5698c72ff19cb09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6177f5d Upgrade to 0.0.6