$ git clone -n https://src.fedoraproject.org/rpms/rust-allocator-api2.git /var/lib/mock/f40-build-2639578-66371/root/chroot_tmpdir/scmroot/rust-allocator-api2
Cloning into '/var/lib/mock/f40-build-2639578-66371/root/chroot_tmpdir/scmroot/rust-allocator-api2'...
$ git fetch origin 31bffaa0caedc06e01dbf60442d94a2b0dba450e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-allocator-api2
 * [new ref]         31bffaa0caedc06e01dbf60442d94a2b0dba450e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31bffaa Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild