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I've installed protoc with homebrew and try to generate dart code with proto files. When I tried a simple case like protoc --dart_out=. test.proto it give me: protoc-gen-dart: program not found or is not executable --dart_out: protoc-gen-dart: Plugin failed with status code 1. But protoc-gen-dart is in my path...

I also tried to specify the path like protoc --dart_out=. --plugin=protoc-gen-dart=~/.pub-cache/bin/protoc-gen-dart ./test.proto but same error...

Anyone know how can I fix this ?

EDIT:

echo | ~/.pub-cache/bin/protoc-gen-dart
Unhandled exception:
InvalidProtocolBufferException: CodedBufferReader encountered a malformed varint.
#0      CodedBufferReader._readRawVarint32 (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:180:5)
#1      CodedBufferReader.readInt32 (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:109:22)
#2      CodedBufferReader.readBytes (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:126:18)
#3      CodedBufferReader.readString (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:132:39)
#4      _mergeFromCodedBufferReader (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer.dart:158:47)
#5      GeneratedMessage.mergeFromBuffer (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/generated_message.dart:159:5)
#6      new GeneratedMessage.fromBuffer (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/generated_message.dart:31:5)
#7      new CodeGeneratorRequest.fromBuffer (package:protoc_plugin/src/plugin.pb.dart:88:15)
#8      CodeGenerator.generate.<anonymous closure> (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protoc_plugin-0.10.5/lib/code_generator.dart:66:25)
#9      _RootZone.runUnary (dart:async/zone.dart:1379:54)
#10     _FutureListener.handleValue (dart:async/future_impl.dart:129:18)
#11     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:642:45)
#12     Future._propagateToListeners (dart:async/future_impl.dart:671:32)
#13     Future._complete (dart:async/future_impl.dart:476:7)
#14     Stream.fold.<anonymous closure> (dart:async/stream.dart:726:18)
#15     _RootZone.runGuarded (dart:async/zone.dart:1302:10)
#16     _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:389:13)
#17     _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:399:15)
#18     _BufferingStreamSubscription._close (dart:async/stream_impl.dart:283:7)
#19     _SyncStreamController._sendDone (dart:async/stream_controller.dart:771:19)
#20     _StreamController._closeUnchecked (dart:async/stream_controller.dart:628:7)
#21     _StreamController.close (dart:async/stream_controller.dart:621:5)
#22     _Socket._onData (dart:io/runtime/binsocket_patch.dart:1728:21)
#23     _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#24     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#25     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#26     _SyncStreamController._sendData (dart:async/stream_controller.dart:763:19)
#27     _StreamController._add (dart:async/stream_controller.dart:639:7)
#28     _StreamController.add (dart:async/stream_controller.dart:585:5)
#29     new _RawSocket.<anonymous closure> (dart:io/runtime/binsocket_patch.dart:1290:35)
#30     _NativeSocket.issueReadEvent.issue (dart:io/runtime/binsocket_patch.dart:819:18)
#31     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#32     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#33     _runPendingImmediateCallback (dart:isolate/runtime/libisolate_patch.dart:115:13)
#34     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:172:5)

And dtruss output: 

 sudo dtruss protoc --dart_out=. --plugin=protoc-gen-dart=~/.pub-cache/bin/protoc-gen-dart ./test.proto -I=.
Password:
dtrace: system integrity protection is on, some features will not be available

SYSCALL(args)            = return
~/.pub-cache/bin/protoc-gen-dart: program not found or is not executable
--dart_out: protoc-gen-dart: Plugin failed with status code 1.
open("/dev/dtracehelper\0", 0x2, 0xFFFFFFFFE5D36050)             = 3 0
ioctl(0x3, 0x80086804, 0x7FFEE5D35E60)           = 0 0
close(0x3)               = 0 0
madvise(0x10A24F000, 0x2000, 0x5)                = 0 0
access("/AppleInternal/XBS/.isChrooted\0", 0x0, 0x0)             = -1 Err#2
bsdthread_register(0x7FFF65DE2438, 0x7FFF65DE2428, 0x2000)               = 1073742047 0
sysctlbyname(kern.bootargs, 0xD, 0x7FFEE5D35170, 0x7FFEE5D35168, 0x0)            = 0 0
ioctl(0x2, 0x4004667A, 0x7FFEE5D353F4)           = 0 0
mprotect(0x10A2E4000, 0x1000, 0x0)               = 0 0
mprotect(0x10A2EB000, 0x1000, 0x0)               = 0 0
mprotect(0x10A2EC000, 0x1000, 0x0)               = 0 0
mprotect(0x10A2F3000, 0x1000, 0x0)               = 0 0
mprotect(0x109ED0000, 0x90, 0x1)                 = 0 0
mprotect(0x109ED2000, 0x1000, 0x1)               = 0 0
mprotect(0x109ED0000, 0x90, 0x3)                 = 0 0
mprotect(0x109ED0000, 0x90, 0x1)                 = 0 0
issetugid(0x0, 0x0, 0x0)                 = 0 0
getentropy(0x7FFEE5D34A40, 0x20, 0x0)            = 0 0
getpid(0x0, 0x0, 0x0)            = 29452 0
stat64("/AppleInternal\0", 0x7FFEE5D355E0, 0x0)          = -1 Err#2
csops(0x730C, 0x7, 0x7FFEE5D35110)               = -1 Err#22
proc_info(0x2, 0x730C, 0xD)              = 64 0
csops(0x730C, 0x7, 0x7FFEE5D34960)               = -1 Err#22
access(".\0", 0x0, 0x0)          = 0 0
stat64("/\0", 0x7FFEE5D33EF8, 0x0)               = 0 0
getattrlist("/usr\0", 0x7FFF65CC0954, 0x7FFEE5D35840)            = 0 0
getattrlist("/usr/local\0", 0x7FFF65CC0954, 0x7FFEE5D35840)              = 0 0
getattrlist("/usr/local/bin\0", 0x7FFF65CC0954, 0x7FFEE5D35840)          = 0 0
getattrlist("/usr/local/bin/protoc\0", 0x7FFF65CC0954, 0x7FFEE5D35840)           = 0 0
readlink("/usr/local/bin/protoc\0", 0x7FFEE5D34C40, 0x400)               = 37 0
getattrlist("/usr/local/Cellar\0", 0x7FFF65CC0954, 0x7FFEE5D35840)               = 0 0
getattrlist("/usr/local/Cellar/protobuf\0", 0x7FFF65CC0954, 0x7FFEE5D35840)              = 0 0
getattrlist("/usr/local/Cellar/protobuf/3.6.1.1\0", 0x7FFF65CC0954, 0x7FFEE5D35840)              = 0 0
getattrlist("/usr/local/Cellar/protobuf/3.6.1.1/bin\0", 0x7FFF65CC0954, 0x7FFEE5D35840)          = 0 0
getattrlist("/usr/local/Cellar/protobuf/3.6.1.1/bin/protoc\0", 0x7FFF65CC0954, 0x7FFEE5D35840)           = 0 0
access("/usr/local/Cellar/protobuf/3.6.1.1/bin/google/protobuf/descriptor.proto\0", 0x0, 0x0)            = -1 Err#2
access("/usr/local/Cellar/protobuf/3.6.1.1/bin/include/google/protobuf/descriptor.proto\0", 0x0, 0x0)            = -1 Err#2
access("/usr/local/Cellar/protobuf/3.6.1.1/include/google/protobuf/descriptor.proto\0", 0x0, 0x0)                = 0 0
access("./test.proto\0", 0x0, 0x0)               = 0 0
open("./test.proto\0", 0x0, 0x2)                 = 3 0
close(0x3)               = 0 0
open("test.proto\0", 0x0, 0x2)           = 3 0
dtrace: error on enabled probe ID 2174 (ID 159: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2174 (ID 159: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
close(0x3)               = 0 0
pipe(0x0, 0x0, 0x0)              = 3 0
pipe(0x0, 0x0, 0x0)              = 5 0
fork()           = 29455 0
close(0x3)               = 0 0
close(0x6)               = 0 0
sigaction(0xD, 0x7FFEE5D34C78, 0x7FFEE5D34CA0)           = 0 0
select(0x6, 0x7FFEE5D35FE0, 0x7FFEE5D35F60, 0x0, 0x0)            = 1 0
dtrace: error on enabled probe ID 2172 (ID 161: syscall::write:return): invalid kernel access in action #12 at DIF offset 68
close(0x4)               = 0 0
select(0x6, 0x7FFEE5D35FE0, 0x7FFEE5D35F60, 0x0, 0x0)            = 1 0
dtrace: error on enabled probe ID 2174 (ID 159: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
close(0x5)               = 0 0
wait4(0x730F, 0x7FFEE5D34DD8, 0x0)               = 29455 0
sigaction(0xD, 0x7FFEE5D34C78, 0x7FFEE5D34CA0)           = 0 0
getrlimit(0x1008, 0x7FFEE5D36160, 0x0)           = 0 0
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
jaumard
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  • Perhaps `protoc` expects the plugins in a special location, and not merely in the `PATH`. Or perhaps you didn’t export the new path. – Kuba hasn't forgotten Monica Nov 28 '18 at 21:55
  • From the doc of protoc-gen-dart, it just need to be in the PATH, and I can execute protoc-gen-dart directly so no problem on that side I think :( – jaumard Nov 28 '18 at 22:18

1 Answers1

12

Ok, looks like protoc passes the argument path directly to execve(), which does not expand the ~ character to mean home directory. Try this instead:

protoc --dart_out=. --plugin=protoc-gen-dart=$HOME/.pub-cache/bin/protoc-gen-dart ./test.proto

In this case $HOME is expanded by the shell before protoc is executed, so it will see the complete path of /Users/yourname/.pub-cache/....

Below are some steps that were used in debugging, they may help others in the future:

Your second command looks like it should work:

protoc --dart_out=. --plugin=protoc-gen-dart=~/.pub-cache/bin/protoc-gen-dart ./test.proto

Perhaps there is something wrong with the executable. You can try executing it directly:

echo | ~/.pub-cache/bin/protoc-gen-dart

If it is properly executable, you should get an error message similar to "google.protobuf.message.DecodeError: Truncated message." because the data from echo is not what the plugin expects. If you get some other error, that could give clues as to why it is not executable.

You can also try tracing protoc with dtruss to find out why the plugin execution fails:

sudo dtruss -f protoc ...

The -f flag is needed to show when protoc tries to start the plugin. There should be a line like this towards the bottom:

execve("~/.pub-cache/bin/protoc-gen-dart", ..) = -1 Err#2

The error number after Err# tells why the execution failed. In my case, it is number 2, which can be looked up in errno.h file:

grep 2 /usr/include/sys/errno.h

...
#define ENOENT 2 /* No such file or directory */
...

Which is because I don't have dart plugin installed. But in your case the error might be something more surprising.

jpa
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  • Hey @jpa thanks for reaching out, I've updated the question with the 2 output, not really understand dtruss output ^^ – jaumard Dec 01 '18 at 12:01
  • @jaumard Hmm, looks like `dtruss` needs the `-f` flag to give useful output. I updated my answer. – jpa Dec 01 '18 at 12:18
  • @jaumard Ah, looks like it is the ~ character that is messing it up, updated answer again. – jpa Dec 01 '18 at 12:23
  • How dude ! $HOME did the trick !!!! :) thanks a lot ! I'll report this back to the issue of protoc-gen-dart – jaumard Dec 01 '18 at 12:34
  • @jpa Could you please look into this? https://stackoverflow.com/questions/63814928/protoc-gen-dart-program-not-found-or-is-not-executable?noredirect=1#comment112851726_63814928 – Christine Meyer Sep 09 '20 at 21:47
  • @ChristineMeyer Hmm, as a troubleshooting step you could try running a command similar to the start of this answer, i.e. give the full path to protoc-gen-dart on the command line. You can also try running `echo | protoc-gen-dart` to see if it can be executed at all (it should give error like "Cannot parse input", but not "Command not found"). – jpa Sep 10 '20 at 06:49
  • @jpa I tried what you asked "echo | protoc-gen-dart" but said this: "sh: protoc-gen-dart: command not found" – Christine Meyer Sep 10 '20 at 12:19
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    @ChristineMeyer Yeah, sounds like it is not in your path for some reason or other. Try executing it directly with full path, and then check e.g. `echo $PATH` to see if the directory is there and written correctly. – jpa Sep 10 '20 at 12:28
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    @jpa Now I tried this command in an attempt to use full path to protoc-gen-dart and got this error: https://prnt.sc/uewkd5 I dont even know whether that command was supposed to work or not. – Christine Meyer Sep 10 '20 at 12:28
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    @jpa Tested echo $PATH and I see this now: https://prnt.sc/uewmur – Christine Meyer Sep 10 '20 at 12:29
  • Can you please come in my question thread because I shared all the screenshots and everything in there – Christine Meyer Sep 10 '20 at 12:31
  • @jpa Please help me Im stuck since 3+ days now and its really too frustrating that I cant even begin writing a Hello World like service for Flutter app :( – Christine Meyer Sep 10 '20 at 12:39
  • @jpa Im new to MacOS + Golang + gRPC so please bear with me – Christine Meyer Sep 10 '20 at 12:42
  • @ChristineMeyer Yeah, unfortunately I haven't used *any* of those ever :) It was pure luck I was able to solve this question. But it sounds like it might be some basic issue with paths. – jpa Sep 10 '20 at 12:48
  • @jpa I didnt tried your first line of code in this answer because I thought "$HOME/.pub-cache" doesnt even exists and just now I checked and it actually is there! and now I get this error, there might be something wrong in writing command: https://prnt.sc/uex4xa – Christine Meyer Sep 10 '20 at 12:52
  • @jpa and Im actually trying to generate Dart gRPC code, is this even a right way to it? – Christine Meyer Sep 10 '20 at 12:53