From fa0cb2cf4e0b52e57f50b2b8cc25228d481abc31 Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@mit.edu>
Date: Sun, 21 Feb 2016 20:32:29 -0500
Subject: Implement chmod

---
 src/operations.cc   | 1 +
 src/posix_extras.cc | 9 +++++++++
 src/posix_extras.h  | 4 ++++
 3 files changed, 14 insertions(+)

diff --git a/src/operations.cc b/src/operations.cc
index 697f901..4433809 100644
--- a/src/operations.cc
+++ b/src/operations.cc
@@ -335,6 +335,7 @@ fuse_operations FuseOperations(File* const root) {
   result.fgetattr = &Fgetattr;
 
   result.mknod = &Mknod;
+  result.chmod = &Chmod;
   result.rename = &Rename;
   result.open = &Open;
   result.read = &Read;
diff --git a/src/posix_extras.cc b/src/posix_extras.cc
index 17fe275..8a63d11 100644
--- a/src/posix_extras.cc
+++ b/src/posix_extras.cc
@@ -67,6 +67,15 @@ struct stat File::Stat() const {
   return result;
 }
 
+void File::ChModAt(const char* const path, const mode_t mode) const {
+  if (path[0] == '/') {
+    throw std::invalid_argument("absolute path");
+  }
+  if (fchmodat(fd_, path, mode, 0) == -1) {
+    throw SystemError();
+  }
+}
+
 struct stat File::LinkStatAt(const char* const path) const {
   if (path[0] == '/') {
     throw std::invalid_argument("absolute path");
diff --git a/src/posix_extras.h b/src/posix_extras.h
index b9e9da6..2976016 100644
--- a/src/posix_extras.h
+++ b/src/posix_extras.h
@@ -65,6 +65,10 @@ class File {
   // Calls fstat(2) on the file descriptor.
   struct stat Stat() const;
 
+  // Changes the file mode of the path relative to the file descriptor.  The
+  // path must indeed be relative (i.e., it must not start with '/').
+  void ChModAt(const char* path, mode_t) const;
+
   // Calls lstat(2) on the path relative to the file descriptor.  The path must
   // indeed be relative (i.e., it must not start with '/').
   struct stat LinkStatAt(const char* path) const;
-- 
cgit v1.2.3