$ git clone -n https://src.fedoraproject.org/rpms/rust-der0.4.git /var/lib/mock/f40-build-2660808-66918/root/chroot_tmpdir/scmroot/rust-der0.4
Cloning into '/var/lib/mock/f40-build-2660808-66918/root/chroot_tmpdir/scmroot/rust-der0.4'...
$ git fetch origin a3c75d1fb1e7a56e9db3d092889b3c26e4db95e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-der0.4
 * [new ref]         a3c75d1fb1e7a56e9db3d092889b3c26e4db95e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3c75d1 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild