[Linux] failed building the example

[bus710]

Hi,

This is not an error or anything, but I want to share the hiccup I had because otherwise some people might give up early.

Quick solution for busy people - need to run "flutter run" first for the example.

... and the background is following.

When I followed the steps in the introduction, I got an error like below:

First cargo run - error: build failed

cargo run Compiling nativeshell_examples v0.1.0 (/home/bus710/repo/examples) Compiling glib v0.14.8 Compiling gio-sys v0.14.0 Compiling pango-sys v0.14.0 Compiling atk-sys v0.14.0 Compiling nativeshell v0.1.11 error: failed to run custom build command for `nativeshell_examples v0.1.0 (/home/bus710/repo/examples)`

Caused by:
process didn't exit successfully: /home/bus710/repo/examples/target/debug/build/nativeshell_examples-d760aadebf0231c2/build-script-build (exit status: 101)
--- stdout

** Build failed with error **

JSON operation failed: $missing field packageUri at line 1 column 9839Text:
{"configVersion":2,"packages":[{"name":"async","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/async-2.8.2","packageUri":"lib/","languageVersion":"2.12"},{"name":"boolean_selector","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/boolean_selector-2.1.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"characters","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/characters-1.1.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"charcode","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/charcode-1.3.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"clock","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/clock-1.1.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"collection","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.15.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"cupertino_icons","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/cupertino_icons-1.0.3","packageUri":"lib/","languageVersion":"2.12"},{"name":"fake_async","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/fake_async-1.2.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"ffi","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/ffi-1.1.2","packageUri":"lib/","languageVersion":"2.12"},{"name":"file","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/file-6.1.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"flutter","rootUri":"file:///home/bus710/flutter/packages/flutter","packageUri":"lib/","languageVersion":"2.12"},{"name":"flutter_test","rootUri":"file:///home/bus710/flutter/packages/flutter_test","packageUri":"lib/","languageVersion":"2.12"},{"name":"flutter_web_plugins","rootUri":"file:///home/bus710/flutter/packages/flutter_web_plugins","packageUri":"lib/","languageVersion":"2.12"},{"name":"http","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/http-0.13.3","packageUri":"lib/","languageVersion":"2.12"},{"name":"http_parser","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/http_parser-4.0.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"js","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/js-0.6.3","packageUri":"lib/","languageVersion":"2.12"},{"name":"matcher","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/matcher-0.12.11","packageUri":"lib/","languageVersion":"2.12"},{"name":"meta","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/meta-1.7.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"nativeshell","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/nativeshell-0.1.10","packageUri":"lib/","languageVersion":"2.13"},{"name":"package_info_plus","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/package_info_plus-1.0.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"package_info_plus_linux","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/package_info_plus_linux-1.0.2","packageUri":"lib/","languageVersion":"2.12"},{"name":"package_info_plus_macos","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/package_info_plus_macos-1.1.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"package_info_plus_platform_interface","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/package_info_plus_platform_interface-1.0.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"package_info_plus_web","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/package_info_plus_web-1.0.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"package_info_plus_windows","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/package_info_plus_windows-1.0.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"path","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/path-1.8.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"path_provider","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.2","packageUri":"lib/","languageVersion":"2.12"},{"name":"path_provider_linux","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_linux-2.0.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"path_provider_macos","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_macos-2.0.0","packageUri":"lib/","languageVersion":"2.12"},{"name":"path_provider_platform_interface","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_platform_interface-2.0.1","packageUri":"lib/","languageVersion":"2.12"},{"name":"path_provider_windows","rootUri":"file:///home/bus710/flutter/.pub-cache/hosted/pub.dartlan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--- stderr
thread 'main' panicked at 'explicit panic', build.rs:26:9
stack backtrace:
0: std::panicking::begin_panic
at /rustc/c8dfcfe046a7680554bf4eb612bad840e7631c4b/library/std/src/panicking.rs:541:12
1: build_script_build::main
at ./build.rs:26:9
2: core::ops::function::FnOnce::call_once
at /rustc/c8dfcfe046a7680554bf4eb612bad840e7631c4b/library/core/src/ops/function.rs:227:5
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.
warning: build failed, waiting for other jobs to finish...
error: build failed

The error just says "build.rs" panicked. I had no clue because my setup seems fine to me.

My setup

$ flutter --version
Flutter 2.6.0-12.0.pre.366 • channel master • https://github.com/flutter/flutter.git
Framework • revision a82c50f1f6 (47 minutes ago) • 2021-10-15 09:48:08 -0700
Engine • revision 8034050e78
Tools • Dart 2.15.0 (build 2.15.0-217.0.dev)

$ cargo version
cargo 1.55.0 (32da73ab1 2021-08-23)

$ rustc --version
rustc 1.55.0 (c8dfcfe04 2021-09-06)

Then I wanted to check if the example would be built without NativeShell. So I tried "flutter run" to build desktop/web app. For some reason, I couldn't see anything on the screen. At that moment I thought the flutter example might have some issue in the first place, but there is no issue in the issues. Then I just tried "cargo run" again.....

Second cargo run - example got built normally

$ cargo run 1m 9s Compiling nativeshell_examples v0.1.0 (/home/bus710/repo/examples) Compiling gdk-sys v0.14.0 Compiling gdk-pixbuf v0.14.0 Compiling gtk-sys v0.14.0 Compiling gdk v0.14.3 Compiling gtk v0.14.3 Compiling nativeshell v0.1.11 Finished dev [unoptimized + debuginfo] target(s) in 48.40s Running `target/debug/nativeshell_examples`

** Help me make NativeShell and Flutter on desktop better!
** We have a long way to go: https://nativeshell.dev/roadmap

flutter: Observatory listening on http://127.0.0.1:40607/Y2oAKn1Y0iI=/
nativeshell: Writing VM Service info file into ${XDG_RUNTIME_DIR}/vmservice.nativeshell_examples

So my shallow conclusion is that, there were not sufficient flutter packages downloaded/installed when I ran "cargo run" earlier, but the "flutter run" did it for me. Then the second trial was successful.

... I know this is a silly story, but I just hope people don't give up because of this.

[myway7]

me too,on macos m1

[knopp]

I can't seem to reproduce this on fresh checkout of examples.

[bus710]

I suspect that if someone never ran "flutter pub get" after fresh OS install (flutter SDK install), this can happen.
Just want people leverage this nice project. Let me close this ticket, but some people may find this is helpful.

[knopp]

The nativeshell build system should run flutter pub get if package.json does not exist automatically.