Replace generated byte array with go:embed for templates

[cardil]

Summary

Replace the ~17K-line generated Go source file (generate/zz_filesystem_generated.go) containing a hex byte array literal with a gitignored binary zip file + //go:embed.

Changes

• generate/templates/main.go: Router dispatching on check subcommand
• generate/templates/gen.go: Writes binary templates.zip directly (with .gitignore filtering from PR feat: WASI target support for func (build + deploy) #3560)
• generate/templates/check.go: 3-tier verification (existence, staleness, content hash)
• generate/embed.go: //go:embed templates.zip exposes TemplatesZip []byte
• Deleted generate/zz_filesystem_generated.go
• .gitignore: Added generate/templates.zip
• .gitattributes: Removed zz_filesystem_generated.go entry
• Makefile: Updated targets to use generate/templates.zip, added rm -f generate/templates.zip to clean
• hack/verify-codegen.sh: Uses Go checker instead of bash diff
• pkg/functions/templates_embedded.go: //go:generate go run ../../generate/templates (whole package)
• pkg/filesystem/filesystem_test.go: Updated stale error message

Why

The generated Go source file changed in almost every PR that touched templates, causing constant merge conflicts. A binary zip + //go:embed eliminates this entirely since templates.zip is gitignored.

Testing

• make generate/templates.zip ✅
• make test ✅ (all tests pass)
• make check ✅ (lint, imports, spelling, whitespace, EOF)
• go run ./generate/templates check ✅ (3-tier verification)
• Staleness detection ✅ (touch a template → check fails)
• Missing zip detection ✅ (remove zip → check fails)

Assisted-by: 🤖 Claude Opus/Sonnet 4.6

[knative-prow]

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[knative-prow]

@cardil: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
unit-tests_func_main	a5a0ad5	link	true	/test unit-tests

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[matejvasek]

Would this work even if I imported function as a library (We doing that now in Functions OCP dynamic plugin)?

[lkingland]

Sorry, but we tried go:embed as soon as it was available, but it doesn't work for our use-case for multiple reasons.

EDIT: Ah, I see we have a Slack thread about this.

**The generated Go source file changed in almost every PR that touched templates, causing constant merge conflicts. A binary zip + //go:embed eliminates this entirely since templates.zip is gitignored.

tl;dr, This could perhaps be minimized by splitting the monolithic generated file into a per-language, per-template set of generated files.

[cardil]

I think I have a solution. Will keep you posted...

/hold