$ git clone -n https://src.fedoraproject.org/rpms/rust-darling_macro0.12.git /var/lib/mock/f40-build-2640610-66406/root/chroot_tmpdir/scmroot/rust-darling_macro0.12
Cloning into '/var/lib/mock/f40-build-2640610-66406/root/chroot_tmpdir/scmroot/rust-darling_macro0.12'...
$ git fetch origin 9cd4fac404c1d67e0cf28c8d9e1b11e5c26923f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-darling_macro0.12
 * [new ref]         9cd4fac404c1d67e0cf28c8d9e1b11e5c26923f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9cd4fac Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild