$ git clone -n https://src.fedoraproject.org/rpms/rust-silver.git /var/lib/mock/f40-build-1967967-25215/root/chroot_tmpdir/scmroot/rust-silver
Cloning into '/var/lib/mock/f40-build-1967967-25215/root/chroot_tmpdir/scmroot/rust-silver'...
$ git fetch origin 7112635e9133fde74d9d791e444043c93dddbad1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-silver
 * [new ref]         7112635e9133fde74d9d791e444043c93dddbad1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7112635 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces