pax_global_header00006660000000000000000000000064145666074010014523gustar00rootroot0000000000000052 comment=95cd29edf757ff54f161f1aa8bd36d9d13a14a4d overlayfs-0.9.2/000077500000000000000000000000001456660740100135455ustar00rootroot00000000000000overlayfs-0.9.2/.github/000077500000000000000000000000001456660740100151055ustar00rootroot00000000000000overlayfs-0.9.2/.github/FUNDING.yml000066400000000000000000000000151456660740100167160ustar00rootroot00000000000000github: [bep]overlayfs-0.9.2/.github/workflows/000077500000000000000000000000001456660740100171425ustar00rootroot00000000000000overlayfs-0.9.2/.github/workflows/test.yml000066400000000000000000000022361456660740100206470ustar00rootroot00000000000000on: push: branches: [main] pull_request: name: Test jobs: test: strategy: matrix: go-version: [1.21.x, 1.22.x] platform: [ubuntu-latest, macos-latest, windows-latest] runs-on: ${{ matrix.platform }} steps: - name: Install Go uses: actions/setup-go@v3 with: go-version: ${{ matrix.go-version }} - name: Install staticcheck run: go install honnef.co/go/tools/cmd/staticcheck@latest shell: bash - name: Install golint run: go install golang.org/x/lint/golint@latest shell: bash - name: Update PATH run: echo "$(go env GOPATH)/bin" >> $GITHUB_PATH shell: bash - name: Checkout code uses: actions/checkout@v1 - name: Fmt if: matrix.platform != 'windows-latest' # :( run: "diff <(gofmt -d .) <(printf '')" shell: bash - name: Vet run: go vet ./... # Go 1.18 support is coming: https://github.com/dominikh/go-tools/issues/1200 #- name: Staticcheck # run: staticcheck ./... - name: Lint run: golint ./... - name: Test run: go test -race ./... overlayfs-0.9.2/.gitignore000066400000000000000000000004151456660740100155350ustar00rootroot00000000000000# Binaries for programs and plugins *.exe *.exe~ *.dll *.so *.dylib # Test binary, built with `go test -c` *.test # Output of the go coverage tool, specifically when used with LiteIDE *.out # Dependency directories (remove the comment below to include it) # vendor/ overlayfs-0.9.2/LICENSE000066400000000000000000000020651456660740100145550ustar00rootroot00000000000000MIT License Copyright (c) 2022 Bjørn Erik Pedersen Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. overlayfs-0.9.2/README.md000066400000000000000000000013261456660740100150260ustar00rootroot00000000000000[![Tests on Linux, MacOS and Windows](https://github.com/bep/overlayfs/workflows/Test/badge.svg)](https://github.com/bep/overlayfs/actions?query=workflow:Test) [![Go Report Card](https://goreportcard.com/badge/github.com/bep/overlayfs)](https://goreportcard.com/report/github.com/bep/overlayfs) [![GoDoc](https://godoc.org/github.com/bep/overlayfs?status.svg)](https://godoc.org/github.com/bep/overlayfs) **overlayfs** is a composite filesystem (currently only) for [Afero](https://github.com/spf13/afero) with similar but different semantics compared to Afero's [copyOnWriteFs](https://github.com/spf13/afero/blob/master/copyOnWriteFs.go). See the [GoDoc](https://godoc.org/github.com/bep/overlayfs) for more information. overlayfs-0.9.2/go.mod000066400000000000000000000007001456660740100146500ustar00rootroot00000000000000module github.com/bep/overlayfs go 1.18 require ( github.com/frankban/quicktest v1.14.2 github.com/spf13/afero v1.9.0 golang.org/x/tools v0.1.0 ) require ( github.com/google/go-cmp v0.5.7 // indirect github.com/kr/pretty v0.3.0 // indirect github.com/kr/text v0.2.0 // indirect github.com/rogpeppe/go-internal v1.6.1 // indirect golang.org/x/text v0.3.7 // indirect golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect ) overlayfs-0.9.2/go.sum000066400000000000000000001276551456660740100147200ustar00rootroot00000000000000cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= cloud.google.com/go 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h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM= google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg= google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY= google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk= google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk= google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk= google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60= google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk= google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak= google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak= google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak= google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc= google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8= google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU= google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8= google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0= google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM= google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE= google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo= google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4= google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= overlayfs-0.9.2/overlayfs.go000066400000000000000000000240571456660740100161160ustar00rootroot00000000000000package overlayfs import ( "fmt" "io" "io/fs" iofs "io/fs" "os" "sync" "github.com/spf13/afero" ) var ( _ FilesystemIterator = (*OverlayFs)(nil) _ afero.Fs = (*OverlayFs)(nil) _ afero.Lstater = (*OverlayFs)(nil) _ afero.File = (*Dir)(nil) _ fs.ReadDirFile = (*Dir)(nil) ) // FilesystemIterator is an interface for iterating over the wrapped filesystems in order. type FilesystemIterator interface { Filesystem(i int) afero.Fs NumFilesystems() int } // Options for the OverlayFs. type Options struct { // The filesystems to overlay ordered in priority from left to right. Fss []afero.Fs // The OverlayFs is by default read-only, but you can nominate the first filesystem to be writable. FirstWritable bool // The DirsMerger is used to merge the contents of two directories. // If not provided, the defaultDirMerger is used. DirsMerger DirsMerger } // OverlayFs is a filesystem that overlays multiple filesystems. // It's by default a read-only filesystem, but you can nominate the first filesystem to be writable. // For all operations, the filesystems are checked in order until found. // If a filesystem implementes FilesystemIterator, those filesystems will be checked before continuing. type OverlayFs struct { fss []afero.Fs mergeDirs DirsMerger firstWritable bool } // New creates a new OverlayFs with the given options. func New(opts Options) *OverlayFs { if opts.DirsMerger == nil { opts.DirsMerger = defaultDirMerger } return &OverlayFs{ fss: opts.Fss, mergeDirs: opts.DirsMerger, firstWritable: opts.FirstWritable, } } // Append creates a shallow copy of the filesystem and appends the given filesystems to it. func (ofs OverlayFs) Append(fss ...afero.Fs) *OverlayFs { ofs.fss = append(ofs.fss, fss...) return &ofs } // WithDirsMerger creates a shallow copy of the filesystem and sets the DirsMerger. func (ofs OverlayFs) WithDirsMerger(d DirsMerger) *OverlayFs { ofs.mergeDirs = d return &ofs } // Filesystem returns filesystem with index i, nil if not found. func (ofs *OverlayFs) Filesystem(i int) afero.Fs { if i >= len(ofs.fss) { return nil } return ofs.fss[i] } // NumFilesystems returns the number of filesystems in this composite filesystem. func (ofs *OverlayFs) NumFilesystems() int { return len(ofs.fss) } // Name returns the name of this filesystem. func (ofs *OverlayFs) Name() string { return "overlayfs" } func (ofs *OverlayFs) collectDirs(name string, withFs func(fs afero.Fs)) error { for _, fs := range ofs.fss { if err := ofs.collectDirsRecursive(fs, name, withFs); err != nil { return err } } return nil } func (ofs *OverlayFs) collectDirsRecursive(fs afero.Fs, name string, withFs func(fs afero.Fs)) error { if fi, err := fs.Stat(name); err == nil && fi.IsDir() { withFs(fs) } if fsi, ok := fs.(FilesystemIterator); ok { for i := 0; i < fsi.NumFilesystems(); i++ { if err := ofs.collectDirsRecursive(fsi.Filesystem(i), name, withFs); err != nil { return err } } } return nil } func (ofs *OverlayFs) stat(name string, lstatIfPossible bool) (afero.Fs, os.FileInfo, bool, error) { for _, fs := range ofs.fss { if fs2, fi, ok, err := ofs.statRecursive(fs, name, lstatIfPossible); err == nil || !os.IsNotExist(err) { return fs2, fi, ok, err } } return nil, nil, false, os.ErrNotExist } func (ofs *OverlayFs) statRecursive(fs afero.Fs, name string, lstatIfPossible bool) (afero.Fs, os.FileInfo, bool, error) { if lstatIfPossible { if lfs, ok := fs.(afero.Lstater); ok { fi, ok, err := lfs.LstatIfPossible(name) if err == nil || !os.IsNotExist(err) { return fs, fi, ok, err } } else if fi, err := fs.Stat(name); err == nil || !os.IsNotExist(err) { return fs, fi, false, err } } else if fi, err := fs.Stat(name); err == nil || !os.IsNotExist(err) { return fs, fi, false, err } if fsi, ok := fs.(FilesystemIterator); ok { for i := 0; i < fsi.NumFilesystems(); i++ { if fs2, fi, ok, err := ofs.statRecursive(fsi.Filesystem(i), name, lstatIfPossible); err == nil || !os.IsNotExist(err) { return fs2, fi, ok, err } } } return nil, nil, false, os.ErrNotExist } func (ofs *OverlayFs) writeFs() afero.Fs { if len(ofs.fss) == 0 { panic("overlayfs: there are no filesystems to write to") } return ofs.fss[0] } // DirsMerger is used to merge two directories. type DirsMerger func(lofi, bofi []fs.DirEntry) []fs.DirEntry var defaultDirMerger = func(lofi, bofi []fs.DirEntry) []fs.DirEntry { for _, bofi := range bofi { var found bool for _, lofi := range lofi { if bofi.Name() == lofi.Name() { found = true break } } if !found { lofi = append(lofi, bofi) } } return lofi } var dirPool = &sync.Pool{ New: func() any { return &Dir{} }, } func getDir() *Dir { return dirPool.Get().(*Dir) } func releaseDir(dir *Dir) { dir.fss = dir.fss[:0] dir.fis = dir.fis[:0] dir.dirOpeners = dir.dirOpeners[:0] dir.info = nil dir.offset = 0 dir.name = "" dir.err = nil dirPool.Put(dir) } // OpenDir opens a new Dir with dirs to be merged by the given merge func. // If merge is nil, a default DirsMerger is used. func OpenDir( merge DirsMerger, // Used to stat the directory. info func() (os.FileInfo, error), // Used to open the directories to be merged. dirOpeners ...func() (afero.File, error), ) (*Dir, error) { if merge == nil { merge = defaultDirMerger } if info == nil { panic("overlayfs: info must not be nil") } if len(dirOpeners) == 0 { panic("overlayfs: dirOpeners must not be empty") } dir := getDir() dir.dirOpeners = dirOpeners dir.info = info dir.merge = merge return dir, nil } // Dir is an afero.File that represents list of directories that will be merged in Readdir and Readdirnames. type Dir struct { // It's either a named directory in a slice of filesystems or a slice of directories. name string fss []afero.Fs // Set if fss is not set. dirOpeners []func() (afero.File, error) info func() (os.FileInfo, error) merge DirsMerger err error offset int fis []fs.DirEntry } // Readdir implements afero.File.Readdir. // If n > 0, Readdir returns at most n. // Note that Dir also implements fs.ReadDirFile, which is more efficient. func (d *Dir) Readdir(n int) ([]os.FileInfo, error) { dirEntries, err := d.ReadDir(n) if err != nil { return nil, err } fis := make([]os.FileInfo, len(dirEntries)) for i, dirEntry := range dirEntries { fi, err := dirEntry.Info() if err != nil { return nil, err } fis[i] = fi } return fis, nil } // ReadDir implements fs.ReadDirFile. func (d *Dir) ReadDir(n int) ([]fs.DirEntry, error) { if d.err != nil { return nil, d.err } if d.isClosed() { return nil, os.ErrClosed } if d.offset == 0 { readDir := func(fs afero.Fs, f afero.File) error { var err error if f == nil { f, err = fs.Open(d.name) if err != nil { return err } } defer f.Close() var dirEntries []iofs.DirEntry if rdf, ok := f.(iofs.ReadDirFile); ok { dirEntries, err = rdf.ReadDir(-1) if err != nil { return err } } else { var fis []os.FileInfo fis, err = f.Readdir(-1) if err != nil { return err } dirEntries = make([]iofs.DirEntry, len(fis)) for i, fi := range fis { dirEntries[i] = dirEntry{fi} } } d.fis = d.merge(d.fis, dirEntries) return nil } for _, fs := range d.fss { if err := readDir(fs, nil); err != nil { return nil, err } } for _, open := range d.dirOpeners { f, err := open() if err != nil { return nil, err } if err := readDir(nil, f); err != nil { return nil, err } } } fis := d.fis[d.offset:] if n <= 0 { d.err = io.EOF if d.offset > 0 && len(fis) == 0 { return nil, d.err } fisc := make([]fs.DirEntry, len(fis)) copy(fisc, fis) return fisc, nil } if len(fis) == 0 { d.err = io.EOF return nil, d.err } if n > len(d.fis) { n = len(d.fis) } defer func() { d.offset += n }() fisc := make([]fs.DirEntry, len(fis[:n])) copy(fisc, fis[:n]) return fisc, nil } // Readdirnames implements afero.File.Readdirnames. // If n > 0, Readdirnames returns at most n. func (d *Dir) Readdirnames(n int) ([]string, error) { if d.isClosed() { return nil, os.ErrClosed } fis, err := d.ReadDir(n) if err != nil { return nil, err } names := make([]string, len(fis)) for i, fi := range fis { names[i] = fi.Name() } return names, nil } // Stat implements afero.File.Stat. func (d *Dir) Stat() (os.FileInfo, error) { if d.isClosed() { return nil, os.ErrClosed } if d.info != nil { return d.info() } return d.fss[0].Stat(d.name) } // Close implements afero.File.Close. // Note that d must not be used after it is closed, // as the object may be reused. func (d *Dir) Close() error { releaseDir(d) return nil } // Name implements afero.File.Name. func (d *Dir) Name() string { return d.name } func (d *Dir) notSupported() string { return fmt.Sprintf("operation not supported on directory %q", d.name) } // Read is not supported. func (d *Dir) Read(p []byte) (n int, err error) { panic(d.notSupported()) } // ReadAt is not supported. func (d *Dir) ReadAt(p []byte, off int64) (n int, err error) { panic(d.notSupported()) } // Seek is not supported. func (d *Dir) Seek(offset int64, whence int) (int64, error) { panic(d.notSupported()) } // Write is not supported. func (d *Dir) Write(p []byte) (n int, err error) { panic(d.notSupported()) } // WriteAt is not supported. func (d *Dir) WriteAt(p []byte, off int64) (n int, err error) { panic(d.notSupported()) } // Sync is not supported. func (d *Dir) Sync() error { panic(d.notSupported()) } // Truncate is not supported. func (d *Dir) Truncate(size int64) error { panic(d.notSupported()) } // WriteString is not supported. func (d *Dir) WriteString(s string) (ret int, err error) { panic(d.notSupported()) } func (d *Dir) isClosed() bool { return len(d.fss) == 0 && len(d.dirOpeners) == 0 } // dirEntry is an adapter from os.FileInfo to fs.DirEntry type dirEntry struct { fs.FileInfo } var _ fs.DirEntry = dirEntry{} func (d dirEntry) Type() fs.FileMode { return d.FileInfo.Mode().Type() } func (d dirEntry) Info() (fs.FileInfo, error) { return d.FileInfo, nil } overlayfs-0.9.2/overlayfs_test.go000066400000000000000000000364171456660740100171600ustar00rootroot00000000000000package overlayfs import ( "bytes" "errors" "fmt" "io" "io/fs" "os" "path/filepath" "sort" "strings" "sync" "testing" "time" qt "github.com/frankban/quicktest" "github.com/spf13/afero" "golang.org/x/tools/txtar" ) func TestAppend(t *testing.T) { c := qt.New(t) ofs1 := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "1")}}) ofs2 := ofs1.Append(basicFs("3", "1")) c.Assert(ofs1.NumFilesystems(), qt.Equals, 2) c.Assert(ofs2.NumFilesystems(), qt.Equals, 3) c.Assert(readDirnames(c, ofs1, "mydir"), qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt", "f1-2.txt", "f2-2.txt"}) c.Assert(readDirnames(c, ofs2, "mydir"), qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt", "f1-2.txt", "f2-2.txt", "f1-3.txt", "f2-3.txt"}) } func TestWithDirsMerger(t *testing.T) { c := qt.New(t) ofs1 := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "1")}}) ofs2 := ofs1.WithDirsMerger(func(lofi, bofi []fs.DirEntry) []fs.DirEntry { if len(lofi) == 0 { return bofi } return lofi[:2] }) ofs1 = ofs1.Append(basicFs("3", "1")) c.Assert(ofs1.NumFilesystems(), qt.Equals, 3) c.Assert(ofs2.NumFilesystems(), qt.Equals, 2) c.Assert(readDirnames(c, ofs1, "mydir"), qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt", "f1-2.txt", "f2-2.txt", "f1-3.txt", "f2-3.txt"}) c.Assert(readDirnames(c, ofs2, "mydir"), qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt"}) } func TestEmpty(t *testing.T) { c := qt.New(t) ofs := New(Options{FirstWritable: true}) c.Assert(ofs.NumFilesystems(), qt.Equals, 0) _, err := ofs.Stat("mydir/notfound.txt") c.Assert(err, qt.ErrorIs, fs.ErrNotExist) c.Assert(func() { ofs.Create("mydir/foo.txt") }, qt.PanicMatches, "overlayfs: there are no filesystems to write to") ofs = ofs.Append(basicFs("1", "1")) c.Assert(ofs.NumFilesystems(), qt.Equals, 1) _, err = ofs.Stat("mydir/f1-1.txt") c.Assert(err, qt.IsNil) f, err := ofs.Create("mydir/foo.txt") c.Assert(err, qt.IsNil) f.Close() } func TestConcurrencyDir(t *testing.T) { c := qt.New(t) ofs1Fs := New(Options{Fss: []afero.Fs{basicFs("1", "1")}}) ofs2Fs := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "1")}}) const mydir = "mydir" var wg sync.WaitGroup for i := 0; i < 30; i++ { wg.Add(1) go func() { defer wg.Done() for _, ofsFs := range []*OverlayFs{ofs1Fs, ofs2Fs} { d, err := ofsFs.Open(mydir) c.Assert(err, qt.IsNil) fi, err := d.Stat() c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, mydir) c.Assert(d.Close(), qt.IsNil) fi, err = ofsFs.Stat(mydir) c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, mydir) c.Assert(fi.IsDir(), qt.IsTrue) } }() } wg.Wait() } func TestConcurrencyDirEmptyFs(t *testing.T) { c := qt.New(t) emptyFs := New(Options{}) const mydir = "mydir" var wg sync.WaitGroup for i := 0; i < 30; i++ { wg.Add(1) go func() { defer wg.Done() d, err := emptyFs.Open(mydir) c.Assert(err, qt.ErrorIs, fs.ErrNotExist) c.Assert(d, qt.IsNil) fi, err := emptyFs.Stat(mydir) c.Assert(err, qt.ErrorIs, fs.ErrNotExist) c.Assert(fi, qt.IsNil) }() } wg.Wait() } func TestFileystemIterator(t *testing.T) { c := qt.New(t) fs1, fs2 := basicFs("", "1"), basicFs("", "2") ofs := New(Options{Fss: []afero.Fs{fs1, fs2}}) c.Assert(ofs.NumFilesystems(), qt.Equals, 2) c.Assert(ofs.Filesystem(0), qt.Equals, fs1) c.Assert(ofs.Filesystem(1), qt.Equals, fs2) c.Assert(ofs.Filesystem(2), qt.IsNil) } func TestOpenDir(t *testing.T) { c := qt.New(t) fs1, fs2, fs3 := basicFs("1", "1"), basicFs("1", "2"), basicFs("2", "2") fi1, _ := fs1.Stat("mydir") info := func() (os.FileInfo, error) { return fi1, nil } dir, err := OpenDir( nil, info, func() (afero.File, error) { return fs1.Open("mydir") }, func() (afero.File, error) { return fs2.Open("mydir") }, func() (afero.File, error) { return fs3.Open("mydir") }, ) c.Assert(err, qt.IsNil) dirEntries, err := dir.ReadDir(-1) c.Assert(err, qt.IsNil) c.Assert(dirEntries, qt.HasLen, 4) fi, err := dir.Stat() c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, "mydir") c.Assert(dir.Close(), qt.IsNil) } func TestReadOps(t *testing.T) { c := qt.New(t) fs1, fs2 := basicFs("1", "1"), basicFs("2", "2") ofs := New(Options{Fss: []afero.Fs{fs1, fs2}}) c.Assert(ofs.Name(), qt.Equals, "overlayfs") // Open c.Assert(readFile(c, ofs, "mydir/f1-1.txt"), qt.Equals, "f1-1") c.Assert(readFile(c, ofs, "mydir/f2-2.txt"), qt.Equals, "f2-2") // Stat fi, err := ofs.Stat("mydir/f1-1.txt") c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, "f1-1.txt") _, err = ofs.Stat("mydir/notfound.txt") c.Assert(err, qt.ErrorIs, fs.ErrNotExist) fi, err = ofs.Stat("mydir/f2-2.txt") c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, "f2-2.txt") // LstatIfPossible fi, _, err = ofs.LstatIfPossible("mydir/f2-1.txt") c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, "f2-1.txt") _, _, err = ofs.LstatIfPossible("mydir/notfound.txt") c.Assert(err, qt.ErrorIs, fs.ErrNotExist) } func TestReadOpsErrors(t *testing.T) { c := qt.New(t) statErr := errors.New("stat error") fs1, fs2 := basicFs("1", "1"), &testFs{statErr: statErr} ofs := New(Options{Fss: []afero.Fs{fs1, fs2}}) fi, err := ofs.Stat("mydir/f1-1.txt") c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, "f1-1.txt") _, err = ofs.Stat("mydir/notfound.txt") c.Assert(err, qt.ErrorIs, statErr) // LstatIfPossible fi, _, err = ofs.LstatIfPossible("mydir/f2-1.txt") c.Assert(err, qt.IsNil) c.Assert(fi.Name(), qt.Equals, "f2-1.txt") _, _, err = ofs.LstatIfPossible("mydir/notfound.txt") c.Assert(err, qt.ErrorIs, statErr) } func TestOpenRecursive(t *testing.T) { c := qt.New(t) fs1, fs2 := basicFs("1", "1"), basicFs("1", "2") fs3, fs4 := basicFs("2", "3"), basicFs("1", "4") ofs2 := New(Options{Fss: []afero.Fs{fs1, fs2}}) ofs3 := New(Options{Fss: []afero.Fs{ofs2, fs3, fs4}}) ofs1 := New(Options{Fss: []afero.Fs{ofs3}}) c.Assert(readFile(c, ofs1, "mydir/f1-1.txt"), qt.Equals, "f1-1") c.Assert(readFile(c, ofs1, "mydir/f1-2.txt"), qt.Equals, "f1-3") } func TestWriteOpsReadonly(t *testing.T) { c := qt.New(t) fs1, fs2 := basicFs("1", "1"), basicFs("1", "2") ofsReadOnly := New(Options{Fss: []afero.Fs{fs1, fs2}}) _, err := ofsReadOnly.Create("mydir/foo.txt") c.Assert(err, qt.ErrorIs, fs.ErrPermission) _, err = ofsReadOnly.OpenFile("mydir/foo.txt", os.O_CREATE, 0o777) err = ofsReadOnly.Chmod("mydir/foo.txt", 0o666) c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.Chown("mydir/foo.txt", 1, 2) c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.Chtimes("mydir/foo.txt", time.Now(), time.Now()) c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.Mkdir("mydir", 0o777) c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.MkdirAll("mydir", 0o777) c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.Remove("mydir") c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.RemoveAll("mydir") c.Assert(err, qt.ErrorIs, fs.ErrPermission) err = ofsReadOnly.Rename("a", "b") c.Assert(err, qt.ErrorIs, fs.ErrPermission) } func TestWriteOpsFirstWriteable(t *testing.T) { c := qt.New(t) fs1, fs2 := basicFs("1", "1"), basicFs("1", "2") ofs := New(Options{Fss: []afero.Fs{fs1, fs2}, FirstWritable: true}) f, err := ofs.Create("mydir/foo.txt") c.Assert(err, qt.IsNil) f.Close() } func TestReaddir(t *testing.T) { c := qt.New(t) fs1, fs2 := basicFs("1", "1"), basicFs("1", "2") fs3, fs4 := basicFs("2", "3"), basicFs("1", "4") ofs2 := New(Options{Fss: []afero.Fs{fs1, fs2}}) ofs1 := New(Options{Fss: []afero.Fs{ofs2, fs3, fs4}}) dirnames := readDirnames(c, ofs1, "mydir") c.Assert(dirnames, qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt", "f1-2.txt", "f2-2.txt"}) ofsSingle := New(Options{Fss: []afero.Fs{basicFs("1", "1")}}) dirnames = readDirnames(c, ofsSingle, "mydir") c.Assert(dirnames, qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt"}) } func TestReaddirN(t *testing.T) { c := qt.New(t) // 6 files. ofs := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "2"), basicFs("3", "3")}}) d, _ := ofs.Open("mydir") for i := 0; i < 3; i++ { fis, err := d.Readdir(2) c.Assert(err, qt.IsNil) c.Assert(len(fis), qt.Equals, 2) } _, err := d.Readdir(1) c.Assert(err, qt.ErrorIs, io.EOF) c.Assert(d.Close(), qt.IsNil) d, _ = ofs.Open("mydir") fis, err := d.Readdir(32) c.Assert(err, qt.IsNil) c.Assert(len(fis), qt.Equals, 6) fis, err = d.Readdir(-1) c.Assert(len(fis), qt.Equals, 0) c.Assert(err, qt.ErrorIs, io.EOF) c.Assert(d.Close(), qt.IsNil) d, _ = ofs.Open("mydir") fis, err = d.Readdir(1) c.Assert(err, qt.IsNil) c.Assert(len(fis), qt.Equals, 1) fis, err = d.Readdir(4) c.Assert(len(fis), qt.Equals, 4) c.Assert(err, qt.IsNil) c.Assert(d.Close(), qt.IsNil) d, _ = ofs.Open("mydir") dirnames, err := d.Readdirnames(3) c.Assert(err, qt.IsNil) c.Assert(dirnames, qt.DeepEquals, []string{"f1-1.txt", "f2-1.txt", "f1-2.txt"}) c.Assert(d.Close(), qt.IsNil) d, _ = ofs.Open("mydir") _, err = d.Readdir(-1) c.Assert(err, qt.IsNil) _, err = d.Readdir(-1) c.Assert(err, qt.ErrorIs, io.EOF) c.Assert(d.Close(), qt.IsNil) } func TestReaddirStable(t *testing.T) { c := qt.New(t) // 6 files. ofs := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "2"), basicFs("3", "3")}}) d, _ := ofs.Open("mydir") fis1, err := d.Readdir(-1) c.Assert(err, qt.IsNil) d.Close() d, _ = ofs.Open("mydir") fis2, err := d.Readdir(2) c.Assert(err, qt.IsNil) c.Assert(d.Close(), qt.IsNil) c.Assert(fis1[0].Name(), qt.Equals, "f1-1.txt") c.Assert(fis2[0].Name(), qt.Equals, "f1-1.txt") sort.Slice(fis1, func(i, j int) bool { return fis1[i].Name() > fis1[j].Name() }) sort.Slice(fis2, func(i, j int) bool { return fis2[i].Name() > fis2[j].Name() }) checkFi := func() { c.Assert(fis1[0].Name(), qt.Equals, "f2-3.txt") c.Assert(fis2[0].Name(), qt.Equals, "f2-1.txt") } checkFi() for i := 0; i < 10; i++ { d, _ = ofs.Open("mydir") d.Readdir(-1) c.Assert(d.Close(), qt.IsNil) } checkFi() } func TestReadDir(t *testing.T) { c := qt.New(t) // 6 files. ofs := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "2"), basicFs("3", "3")}}) d, _ := ofs.Open("mydir") dirEntries, err := d.(fs.ReadDirFile).ReadDir(-1) c.Assert(err, qt.IsNil) c.Assert(len(dirEntries), qt.Equals, 6) c.Assert(dirEntries[0].Name(), qt.Equals, "f1-1.txt") } func TestDirOps(t *testing.T) { c := qt.New(t) ofs := New(Options{Fss: []afero.Fs{basicFs("1", "1"), basicFs("2", "1")}}) dir, err := ofs.Open("mydir") c.Assert(err, qt.IsNil) c.Assert(dir.Name(), qt.Equals, "mydir") _, err = dir.Stat() c.Assert(err, qt.IsNil) // operation not supported on.*. c.Assert(dir.Sync, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.Truncate(0) }, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.WriteString("asdf") }, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.Write(nil) }, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.WriteAt(nil, 21) }, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.Read(nil) }, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.ReadAt(nil, 21) }, qt.PanicMatches, `operation not supported on.*`) c.Assert(func() { dir.Seek(1, 2) }, qt.PanicMatches, `operation not supported on.*`) c.Assert(dir.Close(), qt.IsNil) _, err = dir.Stat() c.Assert(err, qt.ErrorIs, fs.ErrClosed) } func readDirnames(c *qt.C, fs afero.Fs, name string) []string { dir, err := fs.Open(name) c.Assert(err, qt.IsNil) defer dir.Close() dirnames, err := dir.Readdirnames(-1) c.Assert(err, qt.IsNil) return dirnames } func readFile(c *qt.C, fs afero.Fs, name string) string { c.Helper() f, err := fs.Open(name) c.Assert(err, qt.IsNil) defer f.Close() b, err := afero.ReadAll(f) c.Assert(err, qt.IsNil) return string(b) } func basicFs(idFilename, idContent string) afero.Fs { return fsFromTxtTar( strings.ReplaceAll( strings.ReplaceAll(` -- mydir/f1-IDFILENAME.txt -- f1-IDCONTENT -- mydir/f2-IDFILENAME.txt -- f2-IDCONTENT `, "IDCONTENT", idContent), "IDFILENAME", idFilename)) } func fsFromTxtTar(s string) afero.Fs { data := txtar.Parse([]byte(s)) fs := afero.NewMemMapFs() for _, f := range data.Files { if err := afero.WriteFile(fs, f.Name, bytes.TrimSuffix(f.Data, []byte("\n")), 0o666); err != nil { panic(err) } } return fs } type testFs struct { statErr error } func (fs *testFs) Stat(name string) (os.FileInfo, error) { return nil, fs.statErr } func (fs *testFs) LstatIfPossible(name string) (os.FileInfo, bool, error) { return nil, false, fs.statErr } func (fs *testFs) Name() string { return "testFs" } func (fs *testFs) Create(name string) (afero.File, error) { panic("not implemented") } func (fs *testFs) Mkdir(name string, perm os.FileMode) error { panic("not implemented") } func (fs *testFs) MkdirAll(path string, perm os.FileMode) error { panic("not implemented") } func (fs *testFs) Open(name string) (afero.File, error) { panic("not implemented") } func (fs *testFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) { panic("not implemented") } func (fs *testFs) Remove(name string) error { panic("not implemented") } func (fs *testFs) RemoveAll(path string) error { panic("not implemented") } func (fs *testFs) Rename(oldname string, newname string) error { panic("not implemented") } func (fs *testFs) Chmod(name string, mode os.FileMode) error { panic("not implemented") } func (fs *testFs) Chown(name string, uid int, gid int) error { panic("not implemented") } func (fs *testFs) Chtimes(name string, atime time.Time, mtime time.Time) error { panic("not implemented") } func BenchmarkOverlayFs(b *testing.B) { createFs := func(dir, fileID string, numFiles int) afero.Fs { fs := afero.NewMemMapFs() for i := 0; i < numFiles; i++ { if err := afero.WriteFile(fs, filepath.Join(dir, fmt.Sprintf("f%s-%d.txt", fileID, i)), []byte("foo"), 0o666); err != nil { b.Fatal(err) } } return fs } fs1, fs2, fs3 := createFs("mydir", "1", 10), createFs("mydir", "2", 10), createFs("mydir", "3", 10) fs4, fs5 := createFs("mydir", "1", 4), createFs("myotherdir", "1", 4) ofs := New(Options{FirstWritable: true, Fss: []afero.Fs{fs1, fs2, fs3, fs4, fs5}}) runBenchMark := func(name string, fn func(b *testing.B)) { b.Run(name, func(b *testing.B) { for i := 0; i < b.N; i++ { fn(b) } }) } runBenchMark("Stat", func(b *testing.B) { _, err := ofs.Stat("mydir/f2-2.txt") if err != nil { b.Fatal(err) } }) runBenchMark("Open file", func(b *testing.B) { f, err := ofs.Open("mydir/f2-2.txt") if err != nil { b.Fatal(err) } f.Close() }) runBenchMark("Open dir", func(b *testing.B) { f, err := ofs.Open("mydir") if err != nil { b.Fatal(err) } f.Close() }) runBenchMark("Readdir all", func(b *testing.B) { f, err := ofs.Open("mydir") if err != nil { b.Fatal(err) } _, err = f.Readdir(-1) f.Close() }) runBenchMark("Readdir in one fs all", func(b *testing.B) { f, err := ofs.Open("myotherdir") if err != nil { b.Fatal(err) } _, err = f.Readdir(-1) f.Close() }) runBenchMark("Readdir some", func(b *testing.B) { f, err := ofs.Open("mydir") if err != nil { b.Fatal(err) } _, err = f.Readdir(2) f.Close() }) runBenchMark("Readdir in one fs some", func(b *testing.B) { f, err := ofs.Open("myotherdir") if err != nil { b.Fatal(err) } _, err = f.Readdir(2) f.Close() }) } overlayfs-0.9.2/readops.go000066400000000000000000000025771456660740100155440ustar00rootroot00000000000000package overlayfs import ( "os" "github.com/spf13/afero" ) // Stat returns a FileInfo describing the named file, or an error, if any // happens. func (ofs *OverlayFs) Stat(name string) (os.FileInfo, error) { _, fi, _, err := ofs.stat(name, false) return fi, err } // LstatIfPossible will call Lstat if the filesystem iself is, or it delegates to, the os filesystem. // Else it will call Stat. func (ofs *OverlayFs) LstatIfPossible(name string) (os.FileInfo, bool, error) { _, fi, ok, err := ofs.stat(name, false) return fi, ok, err } // Open opens a file, returning it or an error, if any happens. // If name is a directory, a *Dir is returned representing all directories matching name. // Note that a *Dir must not be used after it's closed. func (ofs *OverlayFs) Open(name string) (afero.File, error) { fs, fi, _, err := ofs.stat(name, false) if err != nil { return nil, err } if fi.IsDir() { dir := getDir() dir.name = name dir.merge = ofs.mergeDirs if err := ofs.collectDirs(name, func(fs afero.Fs) { dir.fss = append(dir.fss, fs) }); err != nil { dir.Close() return nil, err } if len(dir.fss) == 0 { // They mave been deleted. dir.Close() return nil, os.ErrNotExist } if len(dir.fss) == 1 { // Optimize for the common case. d, err := dir.fss[0].Open(name) dir.Close() return d, err } return dir, nil } return fs.Open(name) } overlayfs-0.9.2/writeops.go000066400000000000000000000050301456660740100157460ustar00rootroot00000000000000package overlayfs import ( "os" "time" "github.com/spf13/afero" ) // Chmod changes the mode of the named file to mode. func (ofs *OverlayFs) Chmod(name string, mode os.FileMode) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().Chmod(name, mode) } // Chown changes the uid and gid of the named file. func (ofs *OverlayFs) Chown(name string, uid, gid int) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().Chown(name, uid, gid) } // Chtimes changes the access and modification times of the named file func (ofs *OverlayFs) Chtimes(name string, atime, mtime time.Time) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().Chtimes(name, atime, mtime) } // Mkdir creates a directory in the filesystem, return an error if any // happens. func (ofs *OverlayFs) Mkdir(name string, perm os.FileMode) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().Mkdir(name, perm) } // MkdirAll creates a directory path and all parents that does not exist // yet. func (ofs *OverlayFs) MkdirAll(path string, perm os.FileMode) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().MkdirAll(path, perm) } // OpenFile opens a file using the given flags and the given mode. func (ofs *OverlayFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) { if flag&(os.O_WRONLY|os.O_RDWR|os.O_APPEND|os.O_CREATE|os.O_TRUNC) != 0 { if !ofs.firstWritable { return nil, os.ErrPermission } return ofs.writeFs().OpenFile(name, flag, perm) } return ofs.Open(name) } // Remove removes a file identified by name, returning an error, if any // happens. func (ofs *OverlayFs) Remove(name string) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().Remove(name) } // RemoveAll removes a directory path and any children it contains. It // does not fail if the path does not exist (return nil). func (ofs *OverlayFs) RemoveAll(path string) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().RemoveAll(path) } // Rename renames a file. func (ofs *OverlayFs) Rename(oldname, newname string) error { if !ofs.firstWritable { return os.ErrPermission } return ofs.writeFs().Rename(oldname, newname) } // Create creates a file in the filesystem, returning the file and an // error, if any happens. func (ofs *OverlayFs) Create(name string) (afero.File, error) { if !ofs.firstWritable { return nil, os.ErrPermission } return ofs.writeFs().Create(name) }