$ git clone -n https://src.fedoraproject.org/rpms/rust-retry-policies.git /var/lib/mock/f45-build-44440-813/root/chroot_tmpdir/scmroot/rust-retry-policies
Cloning into '/var/lib/mock/f45-build-44440-813/root/chroot_tmpdir/scmroot/rust-retry-policies'...
$ git fetch origin 2cbec9b42f6f160f9ea36c9cfe81c1e5ad634e97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-retry-policies
 * [new ref]         2cbec9b42f6f160f9ea36c9cfe81c1e5ad634e97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cbec9b Simplify .gitignore