The most common cause of Go's embed path issues is incorrect relative paths or typos, with solutions involving verifying file locations, checking build tags, and inspecting embedded content; 1. Ensure paths in //go:embed are relative to the Go source file, not the module root; 2. Verify file and directory names match exactly, including case sensitivity; 3. Use fs.WalkDir on embed.FS at runtime to confirm files are embedded; 4. Check for build constraints excluding the file by running go list -f '{{.EmbedPatterns}}' .; 5. Avoid invalid patterns like .. or absolute paths; 6. Heed compile-time errors for missing files; 7. Clean the build cache with go clean and rebuild to resolve stale behavior, ensuring symlinks are not used since they are not followed by embed.
Go's embed package is powerful, but path issues can be tricky—especially when files aren't found at compile time or runtime. Here’s how to effectively debug and resolve embed path problems.
1. Understand How embed Resolves Paths
The //go:embed directive uses relative paths from the Go source file, not from the project root or module root.
//go:embed templates/* var tmplFS embed.FS
This looks for a templates/ directory in the same directory as the .go file containing the directive.
? Common mistake: Assuming paths are relative to go.mod or main.go. They’re not.
? Fix: Always double-check the physical location of your Go file and ensure the embedded path is correct relative to it.
2. Check File and Directory Structure
Ensure the files actually exist and are spelled correctly (including case sensitivity).
For example:
project/
├── main.go
└── templates/
└── index.htmlIf main.go contains:
//go:embed templates/index.html var content string
But templates/ is actually named Templates/ (capital T), it will fail on case-sensitive systems.
? Debug tip: Use ls or find to verify:
ls -R . # Check actual directory and file names
Also ensure:
- No
.gitignoreor build scripts are deleting assets - You’re not embedding files outside the module or in ignored directories
3. Use embed.FS fs.WalkDir to Inspect Embedded Content
Instead of assuming the FS is populated, inspect it at runtime:
package main
import (
"embed"
"fmt"
"io/fs"
)
//go:embed templates/*
var tmplFS embed.FS
func main() {
err := fs.WalkDir(tmplFS, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
fmt.Println("Embedded:", path)
return nil
})
if err != nil {
panic(err)
}
}If this prints nothing, your files aren’t being embedded.
? This helps confirm whether the issue is at embed time (files not included) or access time (wrong path used when reading).
4. Check for Build Constraints or Multiple Files
If your .go file has build tags (e.g., //go:build linux), the //go:embed directive may be ignored in other environments.
Also, if you have multiple files with //go:embed, ensure they’re in the right package and not excluded by build conditions.
? Debug tip: Run:
go list -f '{{.EmbedPatterns}}' .This shows what patterns go:embed is trying to match in the current package.
If it prints [], your //go:embed directive isn’t being recognized—likely due to syntax error or build tag issues.
5. Avoid Invalid Patterns
//go:embed has strict rules:
- No
..in paths (//go:embed ../shared?) - No absolute paths
- Globs like
*and**are limited (no**for recursive)
? Use only relative paths within the same or subdirectories:
//go:embed assets/* var assets embed.FS // ?
? This will fail silently or with a compile error:
//go:embed ../../shared/*
6. Compiler Errors Are Your Friend
If the path is invalid or files don’t exist, Go will usually give a compile-time error:
pattern ../../config: no matching files
But if you’re using embed.FS, sometimes the FS is just empty—no error, just silence.
? So: If you expect files but get an empty FS, go back and verify the path at compile time.
7. IDE and Cache Gotchas
Some editors or tools (like GoLand or VS Code with Go plugins) may not reflect embed changes immediately.
? Try:
go clean go build
Clears build cache and forces re-embedding.
Also, avoid symlinks—Go's embed doesn’t follow them.
Summary Checklist
- [ ] Path is relative to the
.gofile, not module root - [ ] File/directory names match exactly (case-sensitive)
- [ ] No
..or absolute paths - [ ] No build tags excluding the file
- [ ] Run
go list -f '{{.EmbedPatterns}}' .to verify patterns - [ ] Use
fs.WalkDirto inspect embedded content - [ ] Clean and rebuild if behavior seems stale
Basically, most embed path issues come down to incorrect relative paths or typos. The tooling is strict but predictable—once you align the physical layout with the expected embed context, it works reliably.
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