1 // Copyright (C) The Arvados Authors. All rights reserved.
3 // SPDX-License-Identifier: AGPL-3.0
18 "git.arvados.org/arvados.git/sdk/go/arvados"
19 "git.arvados.org/arvados.git/sdk/go/keepclient"
20 "git.arvados.org/arvados.git/sdk/go/manifest"
21 "github.com/bmatcuk/doublestar/v4"
24 type printfer interface {
25 Printf(string, ...interface{})
28 var errTooManySymlinks = errors.New("too many symlinks, or symlink cycle")
30 const limitFollowSymlinks = 10
32 type filetodo struct {
38 // copier copies data from a finished container's output path to a new
39 // Arvados collection.
41 // Regular files (and symlinks to regular files) in hostOutputDir are
42 // copied from the local filesystem.
44 // Symlinks to mounted collections, and any collections mounted under
45 // ctrOutputDir, are copied by transforming the relevant parts of the
46 // existing manifests, without moving any data around.
48 // Symlinks to other parts of the container's filesystem result in
53 // manifest, err := (&copier{...}).Copy()
55 client *arvados.Client
56 keepClient IKeepClient
60 bindmounts map[string]bindmount
61 mounts map[string]arvados.Mount
62 secretMounts map[string]arvados.Mount
69 manifestCache map[string]*manifest.Manifest
72 // Copy copies data as needed, and returns a new manifest.
73 func (cp *copier) Copy() (string, error) {
74 err := cp.walkMount("", cp.ctrOutputDir, limitFollowSymlinks, true)
76 return "", fmt.Errorf("error scanning files to copy to output: %v", err)
78 collfs, err := (&arvados.Collection{ManifestText: cp.manifest}).FileSystem(cp.client, cp.keepClient)
80 return "", fmt.Errorf("error creating Collection.FileSystem: %v", err)
82 err = cp.applyGlobsToCollectionFS(collfs)
84 return "", fmt.Errorf("error while removing non-matching files from output collection: %w", err)
86 cp.applyGlobsToFilesAndDirs()
87 for _, d := range cp.dirs {
88 err = collfs.Mkdir(d, 0777)
89 if err != nil && err != os.ErrExist {
90 return "", fmt.Errorf("error making directory %q in output collection: %v", d, err)
94 var lastparentdir string
95 for _, f := range cp.files {
96 // If a dir has just had its last file added, do a
97 // full Flush. Otherwise, do a partial Flush (write
98 // full-size blocks, but leave the last short block
99 // open so f's data can be packed with it).
100 dir, _ := filepath.Split(f.dst)
101 if dir != lastparentdir || unflushed > keepclient.BLOCKSIZE {
102 if err := collfs.Flush("/"+lastparentdir, dir != lastparentdir); err != nil {
103 return "", fmt.Errorf("error flushing output collection file data: %v", err)
109 n, err := cp.copyFile(collfs, f)
111 return "", fmt.Errorf("error copying file %q into output collection: %v", f, err)
115 return collfs.MarshalManifest(".")
118 func (cp *copier) matchGlobs(path string, isDir bool) bool {
119 // An entry in the top level of the output directory looks
120 // like "/foo", but globs look like "foo", so we strip the
121 // leading "/" before matching.
122 path = strings.TrimLeft(path, "/")
123 for _, glob := range cp.globs {
124 if !isDir && strings.HasSuffix(glob, "/**") {
125 // doublestar.Match("f*/**", "ff") and
126 // doublestar.Match("f*/**", "ff/gg") both
127 // return true, but (to be compatible with
128 // bash shopt) "ff" should match only if it is
131 // To avoid errant matches, we add the file's
132 // basename to the end of the pattern:
134 // Match("f*/**/ff", "ff") => false
135 // Match("f*/**/gg", "ff/gg") => true
137 // Of course, we need to escape basename in
138 // case it contains *, ?, \, etc.
139 _, name := filepath.Split(path)
140 escapedName := strings.TrimSuffix(strings.Replace(name, "", "\\", -1), "\\")
141 if match, _ := doublestar.Match(glob+"/"+escapedName, path); match {
144 } else if match, _ := doublestar.Match(glob, path); match {
147 // Workaround doublestar bug (v4.6.1).
148 // "foo*/**" should match "foo", but does not,
149 // because isZeroLengthPattern does not accept
150 // "*/**" as a zero length pattern.
151 if trunc := strings.TrimSuffix(glob, "*/**"); trunc != glob {
152 if match, _ := doublestar.Match(trunc, path); match {
161 // Delete entries from cp.files that do not match cp.globs.
163 // Delete entries from cp.dirs that do not match cp.globs.
165 // Ensure parent/ancestor directories of remaining cp.files and
166 // cp.dirs entries are still present in cp.dirs, even if they do not
167 // match cp.globs themselves.
168 func (cp *copier) applyGlobsToFilesAndDirs() {
169 if len(cp.globs) == 0 {
172 keepdirs := make(map[string]bool)
173 for _, path := range cp.dirs {
174 if cp.matchGlobs(path, true) {
175 keepdirs[path] = true
178 for path := range keepdirs {
179 for i, c := range path {
180 if i > 0 && c == '/' {
181 keepdirs[path[:i]] = true
185 var keepfiles []filetodo
186 for _, file := range cp.files {
187 if cp.matchGlobs(file.dst, false) {
188 keepfiles = append(keepfiles, file)
191 for _, file := range keepfiles {
192 for i, c := range file.dst {
193 if i > 0 && c == '/' {
194 keepdirs[file.dst[:i]] = true
199 for path := range keepdirs {
200 cp.dirs = append(cp.dirs, path)
202 sort.Strings(cp.dirs)
206 // Delete files in collfs that do not match cp.globs. Also delete
207 // directories that are empty (after deleting non-matching files) and
208 // do not match cp.globs themselves.
209 func (cp *copier) applyGlobsToCollectionFS(collfs arvados.CollectionFileSystem) error {
210 if len(cp.globs) == 0 {
213 include := make(map[string]bool)
214 err := fs.WalkDir(arvados.FS(collfs), "", func(path string, ent fs.DirEntry, err error) error {
215 if cp.matchGlobs(path, ent.IsDir()) {
216 for i, c := range path {
217 if i > 0 && c == '/' {
218 include[path[:i]] = true
228 err = fs.WalkDir(arvados.FS(collfs), "", func(path string, ent fs.DirEntry, err error) error {
229 if err != nil || path == "" {
233 err := collfs.RemoveAll(path)
246 // Return true if it's possible for any descendant of the given path
247 // to match anything in cp.globs. Used by walkMount to avoid loading
248 // collections that are mounted underneath ctrOutputPath but excluded
250 func (cp *copier) subtreeCouldMatch(path string) bool {
251 if len(cp.globs) == 0 {
254 pathdepth := 1 + strings.Count(path, "/")
255 for _, glob := range cp.globs {
258 for i, c := range glob {
259 if c != '/' || !doublestar.ValidatePattern(glob[:i]) {
260 // Escaped "/", or "/" in a character
261 // class, is not a path separator.
264 if glob[lastsep:i] == "**" {
268 if globdepth++; globdepth == pathdepth {
269 if match, _ := doublestar.Match(glob[:i]+"/*", path+"/z"); match {
275 if globdepth < pathdepth && glob[lastsep:] == "**" {
282 func (cp *copier) copyFile(fs arvados.CollectionFileSystem, f filetodo) (int64, error) {
283 cp.logger.Printf("copying %q (%d bytes)", strings.TrimLeft(f.dst, "/"), f.size)
284 dst, err := fs.OpenFile(f.dst, os.O_CREATE|os.O_WRONLY, 0666)
288 src, err := os.Open(f.src)
294 n, err := io.Copy(dst, src)
299 return n, dst.Close()
302 // Append to cp.manifest, cp.files, and cp.dirs so as to copy src (an
303 // absolute path in the container's filesystem) to dest (an absolute
304 // path in the output collection, or "" for output root).
306 // src must be (or be a descendant of) a readonly "collection" mount,
307 // a writable collection mounted at ctrOutputPath, or a "tmp" mount.
309 // If walkMountsBelow is true, include contents of any collection
310 // mounted below src as well.
311 func (cp *copier) walkMount(dest, src string, maxSymlinks int, walkMountsBelow bool) error {
312 // srcRoot, srcMount indicate the innermost mount that
315 var srcMount arvados.Mount
316 for root, mnt := range cp.mounts {
317 if len(root) > len(srcRoot) && strings.HasPrefix(src+"/", root+"/") {
318 srcRoot, srcMount = root, mnt
321 for root := range cp.secretMounts {
322 if len(root) > len(srcRoot) && strings.HasPrefix(src+"/", root+"/") {
323 // Silently omit secrets, and symlinks to
329 return fmt.Errorf("cannot output file %q: not in any mount", src)
332 // srcRelPath is the path to the file/dir we are trying to
333 // copy, relative to its mount point -- ".", "./foo.txt", ...
334 srcRelPath := filepath.Join(".", srcMount.Path, src[len(srcRoot):])
336 // outputRelPath is the destination path relative to the
337 // output directory. Used for logging and glob matching.
338 var outputRelPath = ""
339 if strings.HasPrefix(src, cp.ctrOutputDir) {
340 outputRelPath = strings.TrimPrefix(src[len(cp.ctrOutputDir):], "/")
342 if outputRelPath == "" {
343 // blank means copy a whole directory, so replace it
344 // with a wildcard to make it a little clearer what's
345 // going on since outputRelPath is only used for logging
350 case srcMount.ExcludeFromOutput:
351 case outputRelPath != "*" && !cp.subtreeCouldMatch(outputRelPath):
352 cp.logger.Printf("not copying %q because contents cannot match output globs", outputRelPath)
354 case srcMount.Kind == "tmp":
355 // Handle by walking the host filesystem.
356 return cp.walkHostFS(dest, src, maxSymlinks, walkMountsBelow)
357 case srcMount.Kind != "collection":
358 return fmt.Errorf("%q: unsupported mount %q in output (kind is %q)", src, srcRoot, srcMount.Kind)
359 case !srcMount.Writable:
360 cp.logger.Printf("copying %q from %v/%v", outputRelPath, srcMount.PortableDataHash, strings.TrimPrefix(srcRelPath, "./"))
361 mft, err := cp.getManifest(srcMount.PortableDataHash)
365 cp.manifest += mft.Extract(srcRelPath, dest).Text
367 cp.logger.Printf("copying %q", outputRelPath)
368 hostRoot, err := cp.hostRoot(srcRoot)
372 f, err := os.Open(filepath.Join(hostRoot, ".arvados#collection"))
377 var coll arvados.Collection
378 err = json.NewDecoder(f).Decode(&coll)
382 mft := manifest.Manifest{Text: coll.ManifestText}
383 cp.manifest += mft.Extract(srcRelPath, dest).Text
386 return cp.walkMountsBelow(dest, src)
391 func (cp *copier) walkMountsBelow(dest, src string) error {
392 for mnt, mntinfo := range cp.mounts {
393 if !strings.HasPrefix(mnt, src+"/") {
396 if cp.copyRegularFiles(mntinfo) {
397 // These got copied into the nearest parent
398 // mount as regular files during setup, so
399 // they get copied as regular files when we
400 // process the parent. Output will reflect any
401 // changes and deletions done by the
405 // Example: we are processing dest=/foo src=/mnt1/dir1
406 // (perhaps we followed a symlink /outdir/foo ->
407 // /mnt1/dir1). Caller has already processed the
408 // collection mounted at /mnt1, but now we find that
409 // /mnt1/dir1/mnt2 is also a mount, so we need to copy
410 // src=/mnt1/dir1/mnt2 to dest=/foo/mnt2.
412 // We handle all descendants of /mnt1/dir1 in this
413 // loop instead of using recursion:
414 // /mnt1/dir1/mnt2/mnt3 is a child of both /mnt1 and
415 // /mnt1/dir1/mnt2, but we only want to walk it
416 // once. (This simplification is safe because mounted
417 // collections cannot contain symlinks.)
418 err := cp.walkMount(dest+mnt[len(src):], mnt, 0, false)
426 // Add entries to cp.dirs and cp.files so as to copy src (an absolute
427 // path in the container's filesystem which corresponds to a real file
428 // or directory in cp.hostOutputDir) to dest (an absolute path in the
429 // output collection, or "" for output root).
431 // Always follow symlinks.
433 // If includeMounts is true, include mounts at and below src.
434 // Otherwise, skip them.
435 func (cp *copier) walkHostFS(dest, src string, maxSymlinks int, includeMounts bool) error {
437 err := cp.walkMountsBelow(dest, src)
443 hostsrc := cp.hostOutputDir + src[len(cp.ctrOutputDir):]
445 // If src is a symlink, walk its target.
446 fi, err := os.Lstat(hostsrc)
448 return fmt.Errorf("lstat %q: %s", src, err)
450 if fi.Mode()&os.ModeSymlink != 0 {
452 return errTooManySymlinks
454 target, err := os.Readlink(hostsrc)
456 return fmt.Errorf("readlink %q: %s", src, err)
458 if !strings.HasPrefix(target, "/") {
459 target = filepath.Join(filepath.Dir(src), target)
461 return cp.walkMount(dest, target, maxSymlinks-1, true)
464 // If src is a regular directory, append it to cp.dirs and
465 // walk each of its children. (If there are no children,
466 // create an empty file "dest/.keep".)
467 if fi.Mode().IsDir() {
469 cp.dirs = append(cp.dirs, dest)
471 dir, err := os.Open(hostsrc)
473 return fmt.Errorf("open %q: %s", src, err)
475 names, err := dir.Readdirnames(-1)
478 return fmt.Errorf("readdirnames %q: %s", src, err)
482 cp.files = append(cp.files, filetodo{
484 dst: dest + "/.keep",
490 for _, name := range names {
491 dest, src := dest+"/"+name, src+"/"+name
492 if _, isSecret := cp.secretMounts[src]; isSecret {
495 if mntinfo, isMount := cp.mounts[src]; isMount && !cp.copyRegularFiles(mntinfo) {
496 // If a regular file/dir somehow
497 // exists at a path that's also a
498 // mount target, ignore the file --
499 // the mount has already been included
500 // with walkMountsBelow().
502 // (...except mount types that are
503 // handled as regular files.)
505 } else if isMount && !cp.subtreeCouldMatch(src[len(cp.ctrOutputDir)+1:]) {
508 err = cp.walkHostFS(dest, src, maxSymlinks, false)
516 // If src is a regular file, append it to cp.files.
517 if fi.Mode().IsRegular() {
518 cp.files = append(cp.files, filetodo{
525 cp.logger.Printf("Skipping unsupported file type (mode %o) in output dir: %q", fi.Mode(), src)
529 // Return the host path that was mounted at the given path in the
531 func (cp *copier) hostRoot(ctrRoot string) (string, error) {
532 if ctrRoot == cp.ctrOutputDir {
533 return cp.hostOutputDir, nil
535 if mnt, ok := cp.bindmounts[ctrRoot]; ok {
536 return mnt.HostPath, nil
538 return "", fmt.Errorf("not bind-mounted: %q", ctrRoot)
541 func (cp *copier) copyRegularFiles(m arvados.Mount) bool {
542 return m.Kind == "text" || m.Kind == "json" || (m.Kind == "collection" && m.Writable)
545 func (cp *copier) getManifest(pdh string) (*manifest.Manifest, error) {
546 if mft, ok := cp.manifestCache[pdh]; ok {
549 var coll arvados.Collection
550 err := cp.client.RequestAndDecode(&coll, "GET", "arvados/v1/collections/"+pdh, nil, nil)
552 return nil, fmt.Errorf("error retrieving collection record for %q: %s", pdh, err)
554 mft := &manifest.Manifest{Text: coll.ManifestText}
555 if cp.manifestCache == nil {
556 cp.manifestCache = map[string]*manifest.Manifest{pdh: mft}
558 cp.manifestCache[pdh] = mft