Cannot build WebGL in headless mode

Hi

I've setup Unity and my project on a Linux server and I wanted to build the project using command line.

In order to do so I have added a WebGLBuilder.cs into Assets/Editor:

Code (CSharp):

1. using UnityEditor;
2. using UnityEditor.Build.Reporting;
3. using UnityEngine;
4.  
5. class WebGLBuilder {
6.     static void build() {
7.  
8.         // Place all your scenes here
9.         string[] scenes = {"Assets/Scenes/main.unity"};
10.  
11.         string pathToDeploy = "webglbuild/";
12.  
13.         BuildReport report = BuildPipeline.BuildPlayer(scenes, pathToDeploy, BuildTarget.WebGL, BuildOptions.None);
14.         Debug.Log(report.summary.outputPath);
15.     }
16. }

I run it like this:

/opt/Unity-2018.2.3f1/Editor/Unity -quit -batchmode -nographics -logFile /root/stdout.log  -buildTarget WebGL -projectPath /root/projects/dw_bo_unity_positioning -executeMethod WebGLBuilder.build

So the build is actually performed, but there's no output produced.
I have checked the logs and there's an error somewhere along:

Code (CSharp):

1. [ERROR] FATAL UNHANDLED EXCEPTION: System.AggregateException: One or more errors occurred. ---> System.ComponentModel.Win32Exception: ApplicationName='python', CommandLine='"/opt/Unity-2018.2.3f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -std=c++11 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_JIT -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/libil2cpp" -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/external/boehmgc/include" -I"/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput" "/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput/Il2CppAttributes.cpp" -o "/root/projects/dw_bo_unity_positioning/Library/il2cpp_cache/46E4D653C630EEF4F90516915E90D106.o"', CurrentDirectory='', Native error= Cannot find the specified file
2.   at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
3.   at System.Diagnostics.Process.Start () [0x0003a] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
4.   at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
5.   at Unity.IL2CPP.Shell.Execute (Unity.IL2CPP.Shell+ExecuteArgs executeArgs, Unity.IL2CPP.Shell+IExecuteController controller) [0x000d6] in <76662c41e4424401aea4578e4a0792d8>:0
6.   at Unity.IL2CPP.Building.BuildShell.Execute (Unity.IL2CPP.Shell+ExecuteArgs args) [0x00012] in <ba170547f5354457b166a91eeab2ddb8>:0
7.   at Unity.IL2CPP.Building.CompilationInvocation.Execute () [0x00007] in <ba170547f5354457b166a91eeab2ddb8>:0
8.   at Unity.IL2CPP.Building.CppProgramBuilder.ProvideObjectFile (Unity.IL2CPP.Building.IntermediateObjectFileCompilationData data) [0x00053] in <ba170547f5354457b166a91eeab2ddb8>:0
9.   at Unity.IL2CPP.Building.ParallelFor+<RunWithResult>c__AnonStorey1`2[D,T].<>m__0 (System.Object o) [0x00032] in <ba170547f5354457b166a91eeab2ddb8>:0
10.    --- End of inner exception stack trace ---
11.   at Unity.IL2CPP.Building.ParallelFor.RunWithResult[D,T] (D[] data, System.Func`2[T,TResult] action) [0x00118] in <ba170547f5354457b166a91eeab2ddb8>:0
12.   at Unity.IL2CPP.Building.CppProgramBuilder.BuildAllCppFiles (System.Collections.Generic.IEnumerable`1[T] sourceFilesToCompile, Unity.IL2CPP.Building.Statistics.IBuildStatisticsCollector statisticsCollector) [0x0015b] in <ba170547f5354457b166a91eeab2ddb8>:0
13.   at Unity.IL2CPP.Building.CppProgramBuilder.Build (Unity.IL2CPP.Building.Statistics.IBuildStatistics& statistics) [0x001d0] in <ba170547f5354457b166a91eeab2ddb8>:0
14.   at Unity.IL2CPP.Building.Statistics.BuildingTestRunnerHelper.BuildAndLogStatsForTestRunner (Unity.IL2CPP.Building.CppProgramBuilder builder, Unity.IL2CPP.Building.Statistics.IBuildStatistics& statistics) [0x00001] in <ba170547f5354457b166a91eeab2ddb8>:0
15.   at il2cpp.Program.DoRun (System.String[] args) [0x00687] in <ed91f4cb3dfc4c70852d8b03a77d76e6>:0
16.   at il2cpp.Program.Run (System.String[] args) [0x00020] in <ed91f4cb3dfc4c70852d8b03a77d76e6>:0
17.   at il2cpp.Program.Main (System.String[] args) [0x00035] in <ed91f4cb3dfc4c70852d8b03a77d76e6>:0
18. ---> (Inner Exception #0) System.ComponentModel.Win32Exception (0x80004005): ApplicationName='python', CommandLine='"/opt/Unity-2018.2.3f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -std=c++11 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_JIT -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/libil2cpp" -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/external/boehmgc/include" -I"/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput" "/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput/Il2CppAttributes.cpp" -o "/root/projects/dw_bo_unity_positioning/Library/il2cpp_cache/46E4D653C630EEF4F90516915E90D106.o"', CurrentDirectory='', Native error= Cannot find the specified file
19.   at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
20.   at System.Diagnostics.Process.Start () [0x0003a] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
21.   at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
22.   at Unity.IL2CPP.Shell.Execute (Unity.IL2CPP.Shell+ExecuteArgs executeArgs, Unity.IL2CPP.Shell+IExecuteController controller) [0x000d6] in <76662c41e4424401aea4578e4a0792d8>:0
23.   at Unity.IL2CPP.Building.BuildShell.Execute (Unity.IL2CPP.Shell+ExecuteArgs args) [0x00012] in <ba170547f5354457b166a91eeab2ddb8>:0
24.   at Unity.IL2CPP.Building.CompilationInvocation.Execute () [0x00007] in <ba170547f5354457b166a91eeab2ddb8>:0
25.   at Unity.IL2CPP.Building.CppProgramBuilder.ProvideObjectFile (Unity.IL2CPP.Building.IntermediateObjectFileCompilationData data) [0x00053] in <ba170547f5354457b166a91eeab2ddb8>:0
26.   at Unity.IL2CPP.Building.ParallelFor+<RunWithResult>c__AnonStorey1`2[D,T].<>m__0 (System.Object o) [0x00032] in <ba170547f5354457b166a91eeab2ddb8>:0 <---
27.  
28. ---> (Inner Exception #1) System.ComponentModel.Win32Exception (0x80004005): ApplicationName='python', CommandLine='"/opt/Unity-2018.2.3f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -std=c++11 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_JIT -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/libil2cpp" -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/external/boehmgc/include" -I"/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput" "/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput/Il2CppTypeDefinitions.cpp" -o "/root/projects/dw_bo_unity_positioning/Library/il2cpp_cache/86C31FECA229BC8DC4A0CE83B2DEF115.o"', CurrentDirectory='', Native error= Cannot find the specified file
29.   at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
30.   at System.Diagnostics.Process.Start () [0x0003a] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
31.   at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
32.   at Unity.IL2CPP.Shell.Execute (Unity.IL2CPP.Shell+ExecuteArgs executeArgs, Unity.IL2CPP.Shell+IExecuteController controller) [0x000d6] in <76662c41e4424401aea4578e4a0792d8>:0
33.   at Unity.IL2CPP.Building.BuildShell.Execute (Unity.IL2CPP.Shell+ExecuteArgs args) [0x00012] in <ba170547f5354457b166a91eeab2ddb8>:0
34.   at Unity.IL2CPP.Building.CompilationInvocation.Execute () [0x00007] in <ba170547f5354457b166a91eeab2ddb8>:0
35.   at Unity.IL2CPP.Building.CppProgramBuilder.ProvideObjectFile (Unity.IL2CPP.Building.IntermediateObjectFileCompilationData data) [0x00053] in <ba170547f5354457b166a91eeab2ddb8>:0
36.   at Unity.IL2CPP.Building.ParallelFor+<RunWithResult>c__AnonStorey1`2[D,T].<>m__0 (System.Object o) [0x00032] in <ba170547f5354457b166a91eeab2ddb8>:0 <---
37.  
38. ---> (Inner Exception #2) System.ComponentModel.Win32Exception (0x80004005): ApplicationName='python', CommandLine='"/opt/Unity-2018.2.3f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -std=c++11 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_JIT -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/libil2cpp" -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/external/boehmgc/include" -I"/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput" "/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput/Il2CppMetadataUsage.cpp" -o "/root/projects/dw_bo_unity_positioning/Library/il2cpp_cache/18E7178DB83E0248FBD3098AD3F3DD47.o"', CurrentDirectory='', Native error= Cannot find the specified file
39.   at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
40.   at System.Diagnostics.Process.Start () [0x0003a] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
41.   at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
42.   at Unity.IL2CPP.Shell.Execute (Unity.IL2CPP.Shell+ExecuteArgs executeArgs, Unity.IL2CPP.Shell+IExecuteController controller) [0x000d6] in <76662c41e4424401aea4578e4a0792d8>:0
43.   at Unity.IL2CPP.Building.BuildShell.Execute (Unity.IL2CPP.Shell+ExecuteArgs args) [0x00012] in <ba170547f5354457b166a91eeab2ddb8>:0
44.   at Unity.IL2CPP.Building.CompilationInvocation.Execute () [0x00007] in <ba170547f5354457b166a91eeab2ddb8>:0
45.   at Unity.IL2CPP.Building.CppProgramBuilder.ProvideObjectFile (Unity.IL2CPP.Building.IntermediateObjectFileCompilationData data) [0x00053] in <ba170547f5354457b166a91eeab2ddb8>:0
46.   at Unity.IL2CPP.Building.ParallelFor+<RunWithResult>c__AnonStorey1`2[D,T].<>m__0 (System.Object o) [0x00032] in <ba170547f5354457b166a91eeab2ddb8>:0 <---
47.  
48. ---> (Inner Exception #3) System.ComponentModel.Win32Exception (0x80004005): ApplicationName='python', CommandLine='"/opt/Unity-2018.2.3f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -std=c++11 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_JIT -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/libil2cpp" -I"/opt/Unity-2018.2.3f1/Editor/Data/il2cpp/external/boehmgc/include" -I"/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput" "/root/projects/dw_bo_unity_positioning/Temp/StagingArea/Data/il2cppOutput/Il2CppInvokerTable.cpp" -o "/root/projects/dw_bo_unity_positioning/Library/il2cpp_cache/B21A71BD9476906A2AA14ECA4D7F1D75.o"', CurrentDirectory='', Native error= Cannot find the specified file
49.   at System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) [0x002dc] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
50.   at System.Diagnostics.Process.Start () [0x0003a] in <60233c34ef3e4e5f892759dbfc5ae27d>:0
51.   at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
52.   at Unity.IL2CPP.Shell.Execute (Unity.IL2CPP.Shell+ExecuteArgs executeArgs, Unity.IL2CPP.Shell+IExecuteController controller) [0x000d6] in <76662c41e4424401aea4578e4a0792d8>:0
53.   at Unity.IL2CPP.Building.BuildShell.Execute (Unity.IL2CPP.Shell+ExecuteArgs args) [0x00012] in <ba170547f5354457b166a91eeab2ddb8>:0
54.   at Unity.IL2CPP.Building.CompilationInvocation.Execute () [0x00007] in <ba170547f5354457b166a91eeab2ddb8>:0
55.   at Unity.IL2CPP.Building.CppProgramBuilder.ProvideObjectFile (Unity.IL2CPP.Building.IntermediateObjectFileCompilationData data) [0x00053] in <ba170547f5354457b166a91eeab2ddb8>:0
56.   at Unity.IL2CPP.Building.ParallelFor+<RunWithResult>c__AnonStorey1`2[D,T].<>m__0 (System.Object o) [0x00032] in <ba170547f5354457b166a91eeab2ddb8>:0 <---
57.  
58.  

And unfortunately this is beyond my knowledge The 'cannot find the specified file' is a bit cryptic, I have no clue which file it cannot find.

Any help will be grately appreciated.

The system is Ubuntu 18.04.

 

@Tak
Tak! (which would be 'yes' in polish).

There was an issue with python indeed. It was looking for 'python' but it was not there (I have had it on my user because of an alias...).
So I have created symlink to python, another error surfaced, this time Unity was looking for python2. Did symlink to this one as well and presto... build complete!

Thanks a lot!

 

@Krstn Could you please more elaborate how you fixed this issue? I am facing the same, The python3 is already installed in my system. Where the unity checks for it? What do you mean by symlink to python?

 

sudo apt install python-is-python3 worked for me.

 

After installing Python 2.7 you'll have to create a symlink to /usr/bin/python for Unity to be able to find it:

Code (csharp):

1. sudo ln -s /usr/bin/python2.7 /usr/bin/python