$ git clone -n https://src.fedoraproject.org/rpms/blake3.git /var/lib/mock/f40-build-2236119-53493/root/chroot_tmpdir/scmroot/blake3
Cloning into '/var/lib/mock/f40-build-2236119-53493/root/chroot_tmpdir/scmroot/blake3'...
$ git fetch origin e1a3ba5c79f95c0132173499df786821a478090c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blake3
 * [new ref]         e1a3ba5c79f95c0132173499df786821a478090c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1a3ba5 Exclude i686 on Fedora >= 39