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authorJakob Unterwurzacher2020-08-01 20:48:32 +0200
committerJakob Unterwurzacher2020-08-01 21:14:17 +0200
commit18b3bdb1584fd8e3dde89a95c0dfff910dd95ae1 (patch)
treef1b46811d45d0e7430e7bfef5c594c0c6860e707 /internal
parent13dc7657ba0aac4da3f4b80ba231a919fdfae0f5 (diff)
v2api/reverse: start fusefrontend_reverse v2 API implementation
Diffstat (limited to 'internal')
-rw-r--r--internal/fusefrontend_reverse/excluder.go61
-rw-r--r--internal/fusefrontend_reverse/node.go11
-rw-r--r--internal/fusefrontend_reverse/root_node.go39
3 files changed, 111 insertions, 0 deletions
diff --git a/internal/fusefrontend_reverse/excluder.go b/internal/fusefrontend_reverse/excluder.go
new file mode 100644
index 0000000..337c3d2
--- /dev/null
+++ b/internal/fusefrontend_reverse/excluder.go
@@ -0,0 +1,61 @@
+package fusefrontend_reverse
+
+import (
+ "io/ioutil"
+ "os"
+ "strings"
+
+ "github.com/rfjakob/gocryptfs/internal/exitcodes"
+ "github.com/rfjakob/gocryptfs/internal/fusefrontend"
+ "github.com/rfjakob/gocryptfs/internal/tlog"
+
+ "github.com/sabhiram/go-gitignore"
+)
+
+// prepareExcluder creates an object to check if paths are excluded
+// based on the patterns specified in the command line.
+func prepareExcluder(args fusefrontend.Args) *ignore.GitIgnore {
+ if len(args.Exclude) > 0 || len(args.ExcludeWildcard) > 0 || len(args.ExcludeFrom) > 0 {
+ excluder, err := ignore.CompileIgnoreLines(getExclusionPatterns(args)...)
+ if err != nil {
+ tlog.Fatal.Printf("Error compiling exclusion rules: %q", err)
+ os.Exit(exitcodes.ExcludeError)
+ }
+ return excluder
+ }
+ return nil
+}
+
+// getExclusionPatters prepares a list of patterns to be excluded.
+// Patterns passed in the -exclude command line option are prefixed
+// with a leading '/' to preserve backwards compatibility (before
+// wildcard matching was implemented, exclusions always were matched
+// against the full path).
+func getExclusionPatterns(args fusefrontend.Args) []string {
+ patterns := make([]string, len(args.Exclude)+len(args.ExcludeWildcard))
+ // add -exclude
+ for i, p := range args.Exclude {
+ patterns[i] = "/" + p
+ }
+ // add -exclude-wildcard
+ copy(patterns[len(args.Exclude):], args.ExcludeWildcard)
+ // add -exclude-from
+ for _, file := range args.ExcludeFrom {
+ lines, err := getLines(file)
+ if err != nil {
+ tlog.Fatal.Printf("Error reading exclusion patterns: %q", err)
+ os.Exit(exitcodes.ExcludeError)
+ }
+ patterns = append(patterns, lines...)
+ }
+ return patterns
+}
+
+// getLines reads a file and splits it into lines
+func getLines(file string) ([]string, error) {
+ buffer, err := ioutil.ReadFile(file)
+ if err != nil {
+ return nil, err
+ }
+ return strings.Split(string(buffer), "\n"), nil
+}
diff --git a/internal/fusefrontend_reverse/node.go b/internal/fusefrontend_reverse/node.go
new file mode 100644
index 0000000..6a1294a
--- /dev/null
+++ b/internal/fusefrontend_reverse/node.go
@@ -0,0 +1,11 @@
+package fusefrontend_reverse
+
+import (
+ "github.com/hanwen/go-fuse/v2/fs"
+)
+
+// Node is a file or directory in the filesystem tree
+// in a `gocryptfs -reverse` mount.
+type Node struct {
+ fs.Inode
+}
diff --git a/internal/fusefrontend_reverse/root_node.go b/internal/fusefrontend_reverse/root_node.go
new file mode 100644
index 0000000..726380f
--- /dev/null
+++ b/internal/fusefrontend_reverse/root_node.go
@@ -0,0 +1,39 @@
+package fusefrontend_reverse
+
+import (
+ "github.com/rfjakob/gocryptfs/internal/contentenc"
+ "github.com/rfjakob/gocryptfs/internal/fusefrontend"
+ "github.com/rfjakob/gocryptfs/internal/inomap"
+ "github.com/rfjakob/gocryptfs/internal/nametransform"
+
+ "github.com/sabhiram/go-gitignore"
+)
+
+// RootNode is the root directory in a `gocryptfs -reverse` mount
+type RootNode struct {
+ Node
+ // Stores configuration arguments
+ args fusefrontend.Args
+ // Filename encryption helper
+ nameTransform nametransform.NameTransformer
+ // Content encryption helper
+ contentEnc *contentenc.ContentEnc
+ // Tests whether a path is excluded (hiden) from the user. Used by -exclude.
+ excluder ignore.IgnoreParser
+ // inoMap translates inode numbers from different devices to unique inode
+ // numbers.
+ inoMap *inomap.InoMap
+}
+
+// NewRootNode returns an encrypted FUSE overlay filesystem.
+// In this case (reverse mode) the backing directory is plain-text and
+// ReverseFS provides an encrypted view.
+func NewRootNode(args fusefrontend.Args, c *contentenc.ContentEnc, n nametransform.NameTransformer) *RootNode {
+ return &RootNode{
+ args: args,
+ nameTransform: n,
+ contentEnc: c,
+ inoMap: inomap.New(),
+ excluder: prepareExcluder(args),
+ }
+}