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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hugofs
import (
"fmt"
"os"
"regexp"
"runtime"
"github.com/gohugoio/hugo/common/types"
"github.com/spf13/afero"
)
var (
// Make sure we don't accidentally use this in the real Hugo.
_ types.DevMarker = (*stacktracerFs)(nil)
_ FilesystemUnwrapper = (*stacktracerFs)(nil)
)
// NewStacktracerFs wraps the given fs printing stack traces for file creates
// matching the given regexp pattern.
func NewStacktracerFs(fs afero.Fs, pattern string) afero.Fs {
return &stacktracerFs{Fs: fs, re: regexp.MustCompile(pattern)}
}
// stacktracerFs can be used in hard-to-debug development situations where
// you get some input you don't understand where comes from.
type stacktracerFs struct {
afero.Fs
// Will print stacktrace for every file creates matching this pattern.
re *regexp.Regexp
}
func (fs *stacktracerFs) DevOnly() {
}
func (fs *stacktracerFs) UnwrapFilesystem() afero.Fs {
return fs.Fs
}
func (fs *stacktracerFs) onCreate(filename string) {
if fs.re.MatchString(filename) {
trace := make([]byte, 1500)
runtime.Stack(trace, true)
fmt.Printf("\n===========\n%q:\n%s\n", filename, trace)
}
}
func (fs *stacktracerFs) Create(name string) (afero.File, error) {
f, err := fs.Fs.Create(name)
if err == nil {
fs.onCreate(name)
}
return f, err
}
func (fs *stacktracerFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
f, err := fs.Fs.OpenFile(name, flag, perm)
if err == nil && isWrite(flag) {
fs.onCreate(name)
}
return f, err
}
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