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build: handle lowercase Dockerfile name as a fallback #444

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merged 1 commit into from
Dec 4, 2020
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build: handle lowercase Dockerfile name as a fallback #444

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35 changes: 34 additions & 1 deletion build/build.go
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Original file line number Diff line number Diff line change
Expand Up @@ -796,12 +796,14 @@ func LoadInputs(inp Inputs, target *client.SolveOpt) (func(), error) {
if dockerfileName == "" {
dockerfileName = "Dockerfile"

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}
target.FrontendAttrs["filename"] = dockerfileName

if dockerfileDir != "" {
target.LocalDirs["dockerfile"] = dockerfileDir
dockerfileName = handleLowercaseDockerfile(dockerfileDir, dockerfileName)
}

target.FrontendAttrs["filename"] = dockerfileName

release := func() {
for _, dir := range toRemove {
os.RemoveAll(dir)
Expand Down Expand Up @@ -889,3 +891,34 @@ func (w *waitingWriter) Close() error {
}
return err
}

// handle https://github.com/moby/moby/pull/10858
func handleLowercaseDockerfile(dir, p string) string {
if filepath.Base(p) != "Dockerfile" {
return p
}

f, err := os.Open(filepath.Dir(filepath.Join(dir, p)))
if err != nil {
return p
}

names, err := f.Readdirnames(-1)
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@thaJeztah thaJeztah Nov 26, 2020 •
edited
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Was wondering why you were using f.Readdirnames here, but then realisedos.Stat() returns the name you pass to it, not the actual filename on disk (preserving case) 😞

Wondering, if Readdirnames() would be an issue if there's lots of files in the directory.

Would something like this work?

dockerfiles, err := filepath.Glob(dir + "/[Dd]ockerfile")

I did a quick test on my machine;

package main

import (
	"fmt"
	"path/filepath"
)

func main() {
	dockerfileDir, _ := filepath.Abs(".")
	dockerfileName := "Dockerfile"
	f := handleLowercaseDockerfile(dockerfileDir, dockerfileName)
	fmt.Println("Using:", f)
}

// handle https://github.com/moby/moby/pull/10858
func handleLowercaseDockerfile(dir, p string) string {
	if filepath.Base(p) != "Dockerfile" {
		return p
	}
	dockerfiles, err := filepath.Glob(filepath.Join(dir, "[Dd]ockerfile"))
	if err != nil || len(dockerfiles) != 1 {
		return p
	}
	// either Dockerfile or dockerfile was found; use what's found
	return filepath.Base(dockerfiles[0])
}
rm -f Dockerfile && touch dOckErFILE && go run main.go
rm -f Dockerfile && touch Dockerfile && go run main.go
rm -f Dockerfile && touch dockerfile && go run main.go

Using: Dockerfile
Using: Dockerfile
Using: dockerfile

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Glob is implemented with Readdirnames(-1)

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sigh 😔

it really surprised me that os.Stat doesn't return the actual filename

if err != nil {
return p
}

foundLowerCase := false
for _, n := range names {
if n == "Dockerfile" {
return p
}
if n == "dockerfile" {
foundLowerCase = true
}
}
if foundLowerCase {
return filepath.Join(filepath.Dir(p), "dockerfile")
}
return p
}