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find.go
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find.go
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package toolchain
import (
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"sort"
"github.com/kr/fs"
"sourcegraph.com/sourcegraph/srclib"
)
// Lookup finds a toolchain by path in the SRCLIBPATH. For each DIR in
// SRCLIBPATH, it checks for the existence of DIR/PATH/Srclibtoolchain.
func Lookup(path string) (*Info, error) {
if NoToolchains {
return nil, nil
}
path = filepath.Clean(path)
dir, err := Dir(path)
if err != nil {
return nil, err
}
// Ensure it exists.
fi, err := os.Stat(dir)
if err != nil {
return nil, err
}
if !fi.Mode().IsDir() {
return nil, &os.PathError{Op: "toolchain.Lookup", Path: dir, Err: errors.New("not a directory")}
}
return newInfo(path, dir, ConfigFilename)
}
func lookupToolchain(toolchainPath string) (string, error) {
matches, err := lookInPaths(filepath.Join(toolchainPath, ConfigFilename), srclib.Path)
if err != nil {
return "", err
}
if len(matches) > 1 {
return "", fmt.Errorf("shadowed toolchain path %q (toolchains: %v)", toolchainPath, matches)
}
if len(matches) == 0 {
return "", &os.PathError{Op: "lookupToolchain", Path: toolchainPath, Err: os.ErrNotExist}
}
return filepath.Dir(matches[0]), nil
}
// List finds all toolchains in the SRCLIBPATH.
//
// List does not find nested toolchains; i.e., if DIR is a toolchain
// dir (with a DIR/Srclibtoolchain file), then none of DIR's
// subdirectories are searched for toolchains.
func List() ([]*Info, error) {
if NoToolchains {
return nil, nil
}
var found []*Info
seen := map[string]string{}
dirs := filepath.SplitList(srclib.Path)
// maps symlinked trees to their original path
origDirs := map[string]string{}
for i := 0; i < len(dirs); i++ {
dir := dirs[i]
if dir == "" {
dir = "."
}
w := fs.Walk(dir)
for w.Step() {
if w.Err() != nil {
return nil, w.Err()
}
fi := w.Stat()
name := fi.Name()
path := w.Path()
if path != dir && (name[0] == '.' || name[0] == '_') {
w.SkipDir()
} else if fi.Mode()&os.ModeSymlink != 0 {
// Check if symlink points to a directory.
if sfi, err := os.Stat(path); err == nil {
if !sfi.IsDir() {
continue
}
} else if os.IsNotExist(err) {
continue
} else {
return nil, err
}
targetPath, err := os.Readlink(path)
if err != nil {
return nil, err
}
if _, traversed := origDirs[targetPath]; !traversed {
// traverse symlinks but refer to symlinked trees' toolchains using
// the path to them through the original entry in SRCLIBPATH
dirs = append(dirs, targetPath)
origDirs[targetPath], _ = filepath.Rel(dir, path)
}
} else if fi.Mode().IsDir() {
// Check for Srclibtoolchain file in this dir.
if _, err := os.Stat(filepath.Join(path, ConfigFilename)); os.IsNotExist(err) {
continue
} else if err != nil {
return nil, err
}
// Found a Srclibtoolchain file.
path = filepath.Clean(path)
var toolchainPath string
if orig, present := origDirs[dir]; present {
toolchainPath, _ = filepath.Rel(dir, path)
if toolchainPath == "." {
toolchainPath = ""
}
toolchainPath = orig + toolchainPath
} else {
toolchainPath, _ = filepath.Rel(dir, path)
}
toolchainPath = filepath.ToSlash(toolchainPath)
if otherDir, seen := seen[toolchainPath]; seen {
return nil, fmt.Errorf("saw 2 toolchains at path %s in dirs %s and %s", toolchainPath, otherDir, path)
}
seen[toolchainPath] = path
info, err := newInfo(toolchainPath, path, ConfigFilename)
if err != nil {
return nil, err
}
found = append(found, info)
// Disallow nested toolchains to speed up List. This
// means that if DIR/Srclibtoolchain exists, no other
// Srclibtoolchain files underneath DIR will be read.
w.SkipDir()
}
}
}
return found, nil
}
func newInfo(toolchainPath, dir, configFile string) (*Info, error) {
prog := filepath.Join(".bin", filepath.Base(toolchainPath))
if runtime.GOOS == "windows" {
prog = winExe(dir, prog)
}
if runtime.GOOS != "windows" {
fi, err := os.Stat(filepath.Join(dir, prog))
if os.IsNotExist(err) {
prog = ""
} else {
if fi.Mode().Perm()&0111 == 0 {
return nil, fmt.Errorf("installed toolchain program %q is not executable (+x)", prog)
}
}
}
return &Info{
Path: toolchainPath,
Dir: dir,
ConfigFile: configFile,
Program: prog,
}, nil
}
// lookInPaths returns all files in paths (a colon-separated list of
// directories) matching the glob pattern.
func lookInPaths(pattern string, paths string) ([]string, error) {
var found []string
seen := map[string]struct{}{}
for _, dir := range filepath.SplitList(paths) {
if dir == "" {
dir = "."
}
matches, err := filepath.Glob(filepath.Join(dir, pattern))
if err != nil {
return nil, err
}
for _, m := range matches {
if _, seen := seen[m]; seen {
continue
}
seen[m] = struct{}{}
found = append(found, m)
}
}
sort.Strings(found)
return found, nil
}
// searches for matching Windows executable (.exe, .bat, .cmd)
func winExe(dir string, program string) string {
candidate := program + ".exe"
if _, err := os.Stat(filepath.Join(dir, candidate)); err == nil {
return candidate
}
candidate = program + ".bat"
if _, err := os.Stat(filepath.Join(dir, candidate)); err == nil {
return candidate
}
candidate = program + ".cmd"
if _, err := os.Stat(filepath.Join(dir, candidate)); err == nil {
return candidate
}
return ""
}