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authorJakob Unterwurzacher2016-09-22 23:28:11 +0200
committerJakob Unterwurzacher2016-09-25 16:43:17 +0200
commita6a7b424f8e8a0f8ddd1c94b7463250ef1337811 (patch)
tree2281d7062d893d70209ecb7a82589e49decac164 /internal/fusefrontend_reverse/virtualfile.go
parent35bcc2dca2dc928e3b7c31e34d785b7a42c06722 (diff)
reverse: resolve long names in Open and GetAttr
The last patch added functionality for generating gocryptfs.longname.* files, this patch adds support for mapping them back to the full filenames. Note that resolving a long name needs a full readdir. A cache will be implemented later on to improve performance.
Diffstat (limited to 'internal/fusefrontend_reverse/virtualfile.go')
-rw-r--r--internal/fusefrontend_reverse/virtualfile.go57
1 files changed, 57 insertions, 0 deletions
diff --git a/internal/fusefrontend_reverse/virtualfile.go b/internal/fusefrontend_reverse/virtualfile.go
new file mode 100644
index 0000000..5373b48
--- /dev/null
+++ b/internal/fusefrontend_reverse/virtualfile.go
@@ -0,0 +1,57 @@
+package fusefrontend_reverse
+
+import (
+ "fmt"
+ "syscall"
+
+ "github.com/hanwen/go-fuse/fuse"
+ "github.com/hanwen/go-fuse/fuse/nodefs"
+)
+
+type virtualFile struct {
+ // Embed nodefs.defaultFile for a ENOSYS implementation of all methods
+ nodefs.File
+ // file content
+ content []byte
+ // absolute path to a parent file
+ parentFile string
+ // inode number
+ ino uint64
+}
+
+func (rfs *reverseFS) NewVirtualFile(content []byte, parentFile string) (nodefs.File, fuse.Status) {
+ return &virtualFile{
+ File: nodefs.NewDefaultFile(),
+ content: content,
+ parentFile: parentFile,
+ ino: rfs.inoGen.next(),
+ }, fuse.OK
+}
+
+// Read - FUSE call
+func (f *virtualFile) Read(buf []byte, off int64) (resultData fuse.ReadResult, status fuse.Status) {
+ if off >= int64(len(f.content)) {
+ return nil, fuse.OK
+ }
+ end := int(off) + len(buf)
+ if end > len(f.content) {
+ end = len(f.content)
+ }
+ return fuse.ReadResultData(f.content[off:end]), fuse.OK
+}
+
+// GetAttr - FUSE call
+func (f *virtualFile) GetAttr(a *fuse.Attr) fuse.Status {
+ var st syscall.Stat_t
+ err := syscall.Lstat(f.parentFile, &st)
+ if err != nil {
+ fmt.Printf("Lstat %q: %v\n", f.parentFile, err)
+ return fuse.ToStatus(err)
+ }
+ st.Ino = f.ino
+ st.Size = int64(len(f.content))
+ st.Mode = syscall.S_IFREG | 0400
+ st.Nlink = 1
+ a.FromStat(&st)
+ return fuse.OK
+}