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lang: Improve cli input handling for files/directories and metadata.yaml #683

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lang: Improve cli input handling for files/directories and metadata.yaml #683

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4cb287a
lang: Allow 'mgmt lang run metadata.yaml'
frebib Nov 24, 2020
5d32044
lang: Correctly handle stat(2) errors on directories/files
frebib Nov 23, 2021
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40 changes: 27 additions & 13 deletions lang/inputs/inputs.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,11 @@
package inputs

import (
"errors"
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"

Expand Down Expand Up @@ -160,7 +162,8 @@ func inputStdin(s string, fs engine.Fs) (*ParsedInput, error) {
// inputMetadata checks to see if we have a metadata file path.
func inputMetadata(s string, fs engine.Fs) (*ParsedInput, error) {
// we've got a metadata.yaml file
if !strings.HasSuffix(s, "/"+interfaces.MetadataFilename) {
if !(s == interfaces.MetadataFilename ||
strings.HasSuffix(s, "/"+interfaces.MetadataFilename)) {
return nil, nil // not us, but no error
}
var err error
Expand Down Expand Up @@ -204,6 +207,7 @@ func inputMetadata(s string, fs engine.Fs) (*ParsedInput, error) {
// real files/ directory
if metadata.Files != "" { // TODO: nil pointer instead?
filesDir := basePath + metadata.Files
// TODO: handle files that throw stat(2) errors
if _, err := fs.Stat(filesDir); err == nil {
files = append(files, filesDir)
}
Expand Down Expand Up @@ -273,25 +277,31 @@ func inputMcl(s string, fs engine.Fs) (*ParsedInput, error) {

// inputDirectory checks if we're given the path to a directory.
func inputDirectory(s string, fs engine.Fs) (*ParsedInput, error) {
if !strings.HasSuffix(s, "/") {
return nil, nil // not us, but no error
}
var err error
if s, err = absify(s); err != nil { // s is now absolute
return nil, err
}
// does dir exist?
fi, err := fs.Stat(s)
if err != nil {
return nil, errwrap.Wrapf(err, "dir: `%s` does not exist", s)
if errors.Is(err, os.ErrNotExist) {
return nil, nil // not us, but no error
}

return nil, errwrap.Wrapf(err, "could not stat dir `%s`", s)
}
if !fi.IsDir() {
return nil, errwrap.Wrapf(err, "dir: `%s` is not a dir", s)
}

if s, err = absify(s); err != nil { // s is now absolute
return nil, err
}

// try looking for a metadata file in the root
md := s + interfaces.MetadataFilename // absolute file
if _, err := fs.Stat(md); err == nil {
md := path.Join(s, interfaces.MetadataFilename) // absolute file
_, err = fs.Stat(md)
// only return errors if they're not ENOENT, e.g. EPERM, EACCES
// ignore ENOENT errors and assume that the file is deliberately absent
if err != nil && !errors.Is(err, os.ErrNotExist) {
return nil, err
} else if err == nil {
if x, err := inputMetadata(md, fs); err != nil { // recurse
return nil, err
} else if x != nil {
Expand All @@ -300,8 +310,12 @@ func inputDirectory(s string, fs engine.Fs) (*ParsedInput, error) {
}

// try looking for a main.mcl file in the root
mf := s + interfaces.MainFilename // absolute file
if _, err := fs.Stat(mf); err == nil {
mf := path.Join(s, interfaces.MainFilename) // absolute file
_, err = fs.Stat(mf)
// same error handling as above. ignore ENOENT and handle all others
if err != nil && !errors.Is(err, os.ErrNotExist) {
return nil, err
} else if err == nil {
if x, err := inputMcl(mf, fs); err != nil { // recurse
return nil, err
} else if x != nil {
Expand Down