From f320b76fd189a363a34bffe981aa67ab97df3362 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Wed, 2 Jan 2019 16:58:48 +0100
Subject: fusefrontend: use Fsetxattr/Fgetxattr/etc on all platforms

Darwin now also has these functions, use them. Simplifies
the code and makes it symlink-safe on Darwin as well.
---
 internal/fusefrontend/xattr_linux.go | 105 -----------------------------------
 1 file changed, 105 deletions(-)

(limited to 'internal/fusefrontend/xattr_linux.go')

diff --git a/internal/fusefrontend/xattr_linux.go b/internal/fusefrontend/xattr_linux.go
index a96a147..fd3b7e5 100644
--- a/internal/fusefrontend/xattr_linux.go
+++ b/internal/fusefrontend/xattr_linux.go
@@ -4,15 +4,7 @@
 package fusefrontend
 
 import (
-	"fmt"
 	"strings"
-	"syscall"
-
-	"github.com/hanwen/go-fuse/fuse"
-
-	"github.com/pkg/xattr"
-
-	"github.com/rfjakob/gocryptfs/internal/tlog"
 )
 
 // Only allow the "user" namespace, block "trusted" and "security", as
@@ -27,100 +19,3 @@ func disallowedXAttrName(attr string) bool {
 func filterXattrSetFlags(flags int) int {
 	return flags
 }
-
-// procFd returns the path to file descriptor "fd" in /proc/self/fd.
-func procFd(fd int) string {
-	return fmt.Sprintf("/proc/self/fd/%d", fd)
-}
-
-// getFileFd calls fs.Open() on relative plaintext path "relPath" and returns
-// the resulting fusefrontend.*File along with the underlying fd. The caller
-// MUST call file.Release() when done with the file. The O_NONBLOCK flag is
-// used to not block on FIFOs.
-//
-// Used by xattrGet() and friends.
-func (fs *FS) getFileFd(relPath string, context *fuse.Context) (*File, int, fuse.Status) {
-	fuseFile, status := fs.Open(relPath, syscall.O_RDONLY|syscall.O_NONBLOCK, context)
-	if !status.Ok() {
-		return nil, -1, status
-	}
-	file, ok := fuseFile.(*File)
-	if !ok {
-		tlog.Warn.Printf("BUG: xattrGet: cast to *File failed")
-		fuseFile.Release()
-		return nil, -1, fuse.EIO
-	}
-	return file, file.intFd(), fuse.OK
-}
-
-// getXattr - read encrypted xattr name "cAttr" from relative
-// plaintext path "relPath". Returns the encrypted xattr value.
-//
-// This function is symlink-safe by using /proc/self/fd.
-func (fs *FS) getXattr(relPath string, cAttr string, context *fuse.Context) ([]byte, fuse.Status) {
-	file, fd, status := fs.getFileFd(relPath, context)
-	if !status.Ok() {
-		return nil, status
-	}
-	defer file.Release()
-
-	cData, err := xattr.Get(procFd(fd), cAttr)
-	if err != nil {
-		return nil, unpackXattrErr(err)
-	}
-	return cData, fuse.OK
-}
-
-// setXattr - set encrypted xattr name "cAttr" to value "cData" on plaintext
-// path "relPath".
-//
-// This function is symlink-safe by using /proc/self/fd.
-func (fs *FS) setXattr(relPath string, cAttr string, cData []byte, flags int, context *fuse.Context) fuse.Status {
-	file, fd, status := fs.getFileFd(relPath, context)
-	if !status.Ok() {
-		return status
-	}
-	defer file.Release()
-
-	err := xattr.SetWithFlags(procFd(fd), cAttr, cData, flags)
-	return unpackXattrErr(err)
-}
-
-// removeXAttr - remove encrypted xattr name "cAttr" from
-// plaintext path "relPath".
-//
-// This function is symlink-safe on Linux by using /proc/self/fd.
-func (fs *FS) removeXAttr(relPath string, cAttr string, context *fuse.Context) fuse.Status {
-	file, fd, status := fs.getFileFd(relPath, context)
-	if !status.Ok() {
-		return status
-	}
-	defer file.Release()
-
-	err := xattr.Remove(procFd(fd), cAttr)
-	return unpackXattrErr(err)
-}
-
-// listXAttr - list encrypted xattr names on plaintext path "relPath".
-//
-// This function is symlink-safe on Linux by using /proc/self/fd.
-func (fs *FS) listXAttr(relPath string, context *fuse.Context) ([]string, fuse.Status) {
-	file, fd, status := fs.getFileFd(relPath, context)
-	if !status.Ok() {
-		// If relPath is a symlink, getFileFd fails with ELOOP. As setXattr()
-		// also fails with ELOOP, there is no way to set xattrs on symlinks,
-		// and we can assume that the file does not have any.
-		if status == fuse.Status(syscall.ELOOP) {
-			return nil, fuse.OK
-		}
-		return nil, status
-	}
-	defer file.Release()
-
-	cNames, err := xattr.List(procFd(fd))
-	if err != nil {
-		status := unpackXattrErr(err)
-		return nil, status
-	}
-	return cNames, fuse.OK
-}
-- 
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