$ git clone -n https://src.fedoraproject.org/rpms/rust-snafu.git /var/lib/mock/f43-build-side-115419-61169094-6589366/root/chroot_tmpdir/scmroot/rust-snafu
Cloning into '/var/lib/mock/f43-build-side-115419-61169094-6589366/root/chroot_tmpdir/scmroot/rust-snafu'...
$ git fetch origin 8c49509b404199baea52e2a08d481ba9cafa6e11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-snafu
 * [new ref]         8c49509b404199baea52e2a08d481ba9cafa6e11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c49509 Update to version 0.8.6; Fixes RHBZ#2368980