$ git clone -n https://src.fedoraproject.org/rpms/rust-blake3.git /var/lib/mock/f40-build-2270647-54843/root/chroot_tmpdir/scmroot/rust-blake3
Cloning into '/var/lib/mock/f40-build-2270647-54843/root/chroot_tmpdir/scmroot/rust-blake3'...
$ git fetch origin ff7570c1974b7a53b74284fab7415475abe2ebd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-blake3
 * [new ref]         ff7570c1974b7a53b74284fab7415475abe2ebd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff7570c Remove CC0-1.0 from license metadata (not acceptable for code in Fedora)