[BUG][angular-typescript] can't generate client, throws java.nio.file.NoSuchFileException

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?

Description

I'm trying to generate an angular client with typescript-angular, and I'm getting the following error:

➜  ng-openapi-gen-test git:(main) ✗ npm run openapi-generator

> ng-openapi-gen-test@1.0.0 openapi-generator
> openapi-generator-cli generate -i openapi.yaml -g typescript-angular -o /output-openapi-generator

[main] INFO  o.o.codegen.DefaultGenerator - Generating with dryRun=false
[main] INFO  o.o.c.ignore.CodegenIgnoreProcessor - Output directory (/output-openapi-generator) does not exist, or is inaccessible. No file (.openapi-generator-ignore) will be evaluated.
[main] INFO  o.o.codegen.DefaultGenerator - OpenAPI Generator: typescript-angular (client)
[main] INFO  o.o.codegen.DefaultGenerator - Generator 'typescript-angular' is considered stable.
[main] INFO  o.o.c.l.AbstractTypeScriptClientCodegen - Hint: Environment variable 'TS_POST_PROCESS_FILE' (optional) not defined. E.g. to format the source code, please try 'export TS_POST_PROCESS_FILE="/usr/local/bin/prettier --write"' (Linux/Mac)
[main] INFO  o.o.c.l.AbstractTypeScriptClientCodegen - Note: To enable file post-processing, 'enablePostProcessFile' must be set to `true` (--enable-post-process-file for CLI).
[main] INFO  o.o.c.l.TypeScriptAngularClientCodegen - generating code for Angular 13.0.1 ...
[main] INFO  o.o.c.l.TypeScriptAngularClientCodegen -   (you can select the angular version by setting the additionalProperty ngVersion)
[main] INFO  o.o.codegen.TemplateManager - writing file /output-openapi-generator/model/./post.ts
Exception in thread "main" java.lang.RuntimeException: Could not generate model 'Post'
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:532)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:888)
        at org.openapitools.codegen.cmd.Generate.execute(Generate.java:441)
        at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: java.nio.file.NoSuchFileException: /output-openapi-generator/model/./post.ts
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
        at java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:434)
        at java.nio.file.Files.newOutputStream(Files.java:216)
        at java.nio.file.Files.write(Files.java:3292)
        at org.openapitools.codegen.TemplateManager.writeToFileRaw(TemplateManager.java:255)
        at org.openapitools.codegen.TemplateManager.writeToFile(TemplateManager.java:237)
        at org.openapitools.codegen.TemplateManager.writeToFile(TemplateManager.java:198)
        at org.openapitools.codegen.TemplateManager.write(TemplateManager.java:164)
        at org.openapitools.codegen.DefaultGenerator.processTemplateToFile(DefaultGenerator.java:1034)
        at org.openapitools.codegen.DefaultGenerator.processTemplateToFile(DefaultGenerator.java:1021)
        at org.openapitools.codegen.DefaultGenerator.generateModel(DefaultGenerator.java:388)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:523)
        ... 4 more

openapi-generator version

^2.4.26

OpenAPI declaration file content or url

Link

Generation Details

openapi-generator-cli generate -i openapi.yaml -g typescript-angular -o /output-openapi-generator

Steps to reproduce

Clone this repo and run npm run openapi-generator
https://github.com/marcellkiss/ng-openapi-gen-debug

Related issues/PRs

--

Suggest a fix

No idea, I tried it with two different openapi files (openapi.json and openapi.yaml in the repo) and both lead to the same result.

Reproduce with the linked ng-openapi-gen-debug repository and the shown openapi-generator-cli command. Start from the TypeScriptAngularClientCodegen model generation path and the DefaultGenerator/TemplateManager stack trace, then compare the output directory handling around model/post.ts. Done means the typescript-angular client generates successfully without NoSuchFileException.