Issue with building vendored dependencies for rust project

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1

Hello there in my project I have rocksdb as a dependency using this branch of rust-rocksdb the problem I’m having is when trying to build with nix there is this compilation error which claims there is a missing file to build here’s the error.

thread 'main' panicked at 'Command failed with error: No such file or directory (os error 2)', /sources/librocksdb-sys-0.7.0+7.1.2-transaction/build.rs:346:19

now librocksdb-sys is the c bindings for rocksdb but I’m not sure how nixos file system works so it might have trouble with finding the files. Locally i had a similar error when building which i solved by installing clang so i included clang-tools in my shell.nix but it still fails. Any help is appreciated.

2

@Mo0nbase, the failure appears to be in a rust function update_submodules() which is trying to execute git submodule update --init.

Unfortunately I do not know nix or rust well enough yet to offer a solution. Does the environment building librocksdb-sys have git? Does the build environment pull sources in a way that can update submodules (git clone)?

Hopefully someone with more nix knowledge can help. I’m curious about how nix works with submodules.

3

if you’re using fetchFromGithub to grab the src, you can just add fetchSubmodules = true; and you’re done.

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4

The crates build.rs script is trying to write to it’s source folder by cloning git submodules but the source is in the nix-store and thus read only. But even cargo guidelines state that build.rs scripts aren’t supposed to modify the source dir, therfore I would file this bug on github.

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