$ git clone -n https://src.fedoraproject.org/rpms/rust-cool_asserts.git /var/lib/mock/f39-build-1544516-36645/root/chroot_tmpdir/scmroot/rust-cool_asserts
Cloning into '/var/lib/mock/f39-build-1544516-36645/root/chroot_tmpdir/scmroot/rust-cool_asserts'...
$ git fetch origin 7fb71a8cac8ca48f9eff5aff4931beebacb785f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cool_asserts
 * [new ref]         7fb71a8cac8ca48f9eff5aff4931beebacb785f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fb71a8 Skip tests that fail with Rust 1.71