Build failed with `Could not apply patches` when system does not offer `patch` binary

[darkyzhou]

I got following errors when building my project with the library:

 > [builder 2/4] RUN cargo chef cook --release --recipe-path recipe.json:
174.2 Caused by:
174.2   process didn't exit successfully: `/app/target/release/build/libquickjs-sys-2900b94a2755abf1/build-script-build` (exit status: 101)
174.2   --- stderr
174.2   Applying patches...
174.2   Applying "stack-overflow-signed.patch"...
174.2   thread 'main' panicked at 'Could not apply patches: Os { code: 2, kind: NotFound, message: "No such file or directory" }', /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/libquickjs-sys-0.9.0/build.rs:133:14
174.2   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
174.2 warning: build failed, waiting for other jobs to finish...
174.6 thread 'main' panicked at 'Exited with status code: 101', /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/cargo-chef-0.1.61/src/recipe.rs:189:27
174.6 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

And it turns out that build.rs relies on patch binary to patch the source codes of QuickJS, and the build image I am using(debian-slim) does not offer patch binary by default. So I have to install it first before compiling.

I suggest manually checking for the presence of the binary before actually calling it in the build.rs.

[koitsu]

Got bit by this today when trying to build mdbook-katex. Is there a reason you have to dynamically apply a diff during software build, rather than just having it pre-applied? Makes no sense to me why this is even being done to begin with.

error: failed to run custom build command for `libquickjs-sys v0.9.0`

Caused by:
  process didn't exit successfully: `/tmp/cargo-installjeiq4Y/release/build/libquickjs-sys-4694cd90dd302129/build-script-build` (exit status: 101)
  --- stderr
  Applying patches...
  Applying "js-tobigint64-overflow.patch"...
  thread 'main' panicked at /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/libquickjs-sys-0.9.0/build.rs:133:14:
  Could not apply patches: Os { code: 2, kind: NotFound, message: "No such file or directory" }
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: failed to compile `mdbook-katex v0.5.10`, intermediate artifacts can be found at `/tmp/cargo-installjeiq4Y`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.
     Summary Successfully installed mdbook, mdbook-admonish, mdbook-catppuccin, mdbook-embed! Failed to install mdbook-katex (see error(s) above).