$ git clone -n https://src.fedoraproject.org/rpms/rust-blobby.git /var/lib/mock/f40-build-2679770-67935/root/chroot_tmpdir/scmroot/rust-blobby
Cloning into '/var/lib/mock/f40-build-2679770-67935/root/chroot_tmpdir/scmroot/rust-blobby'...
$ git fetch origin ebf7c7fb80a23901fd20c9b2a867366a2cfe99fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-blobby
 * [new ref]         ebf7c7fb80a23901fd20c9b2a867366a2cfe99fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebf7c7f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild