$ git clone -n https://src.fedoraproject.org/rpms/rust-blake3.git /var/lib/mock/f45-build-40479-772/root/chroot_tmpdir/scmroot/rust-blake3
Cloning into '/var/lib/mock/f45-build-40479-772/root/chroot_tmpdir/scmroot/rust-blake3'...
$ git fetch origin ee05f931ca3535ba61f30a3af6be98f4e230f9f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-blake3
 * [new ref]         ee05f931ca3535ba61f30a3af6be98f4e230f9f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee05f93 Update to version 1.8.7; Fixes RHBZ#2520164