$ git clone -n https://src.fedoraproject.org/rpms/rust-alloc-stdlib.git /var/lib/mock/f45-build-40044-767/root/chroot_tmpdir/scmroot/rust-alloc-stdlib
Cloning into '/var/lib/mock/f45-build-40044-767/root/chroot_tmpdir/scmroot/rust-alloc-stdlib'...
$ git fetch origin 277a203af47a3af3ee80b46ec0e062311f392052:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-alloc-stdlib
 * [new ref]         277a203af47a3af3ee80b46ec0e062311f392052 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 277a203 Update to version 0.2.4