From 9b9da43082d575a0b4f2261e9cabb9db5f8c6e6e Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kjetil.orbekk@gmail.com>
Date: Sun, 14 May 2017 19:35:50 -0400
Subject: SimpleFileSystem traversal.

---
 Cargo.lock  |  1 +
 Cargo.toml  |  1 +
 default.nix | 13 ++++++++++++-
 deps.nix    |  5 ++---
 src/data.rs | 26 ++++++++++++++++++++++++++
 src/main.rs | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 6 files changed, 92 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 91497e5..cd5a59f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,6 +4,7 @@ version = "0.1.0"
 dependencies = [
  "fuse 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 4e938a1..41918d0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,4 @@ authors = ["Kjetil Orbekk <kj@orbekk.com>"]
 [dependencies]
 fuse = "0.3"
 libc = "0.2"
+time = "0.1"
diff --git a/default.nix b/default.nix
index 66bb250..2355d10 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,18 @@
 with import <nixpkgs> {}; 
+# deps generated with
+# ~/.cargo/bin/generate-nix-pkg Cargo.lock -o deps2.nix
 let mkRustCrate = import ./rust-utils.nix {
     lib = pkgs.lib;
     inherit buildPlatform stdenv;
   }; in
 let deps = import ./deps.nix { inherit pkgs mkRustCrate; }; in
-(deps.rafs_0_1_0 rustUnstable.rustc)
+{
+  rafs_0_1_0 = mkRustCrate {
+    crateName = "rafs";
+    version = "0.1.0";
+    dependencies = with deps; [ fuse_0_3_0 libc_0_2_22 time_0_1_37 ];
+    buildInputs = [ fuse pkgconfig glibc ];
+    src = ./.;
+    release = true;
+  } rustUnstable.rustc;
+}
diff --git a/deps.nix b/deps.nix
index f07958a..671489f 100644
--- a/deps.nix
+++ b/deps.nix
@@ -12,7 +12,7 @@ rec {
       sha256 = "1n49fdna5vxygl5v8s8i2brirg4zn7psc65chga4crcs9fk49w8i";
       name = "fuse-0.3.0.tar.gz";
     };
-    buildInputs = with pkgs; [fuse pkgconfig glibc];
+    buildInputs = with pkgs; [ fuse pkgconfig glibc ];
     libPath = "src/lib.rs";
     libName = "fuse";
     build = "build.rs";
@@ -67,8 +67,7 @@ rec {
   rafs_0_1_0 = mkRustCrate {
     crateName = "rafs";
     version = "0.1.0";
-    dependencies = [ fuse_0_3_0 libc_0_2_22 ];
-    buildInputs = [ fuse pkgconfig glibc ];
+    dependencies = [ fuse_0_3_0 libc_0_2_22 time_0_1_37 ];
     src = ./.;
     inherit release;
   };
diff --git a/src/data.rs b/src/data.rs
index f652a13..6976352 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -14,3 +14,29 @@ pub fn get_data1() -> SimpleFsData {
         1, vec!(("hello".to_string(),
                  SimpleFsData::File(2, "Hello, World!".to_string()))))
 }
+
+pub fn traverse_fs<F>(file: SimpleFsData, f: &mut F)
+    where F: FnMut(& SimpleFsData) {
+    f(&file);
+    match file {
+        SimpleFsData::Directory(_, children) => for (_, file) in children {
+           traverse_fs(file, f);
+        },
+        _ => (),
+    }
+}
+
+#[test]
+fn traverse() {
+    let mut result = String::new();
+    {
+        let mut f = |ref file: &SimpleFsData| {
+            match *file {
+                &SimpleFsData::File(_, ref s) => result += &s,
+                _ => (),
+            };
+        };
+        traverse_fs(get_data1(), &mut f);
+    }
+    assert_eq!("Hello, World!", result);
+}
diff --git a/src/main.rs b/src/main.rs
index 9ad2982..1fc8e53 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,17 +1,66 @@
 extern crate fuse;
 extern crate libc;
 extern crate rafs;
+extern crate time;
 
 use rafs::data::get_data1;
 use rafs::data::SimpleFsData;
-use fuse::{Filesystem, Request, ReplyEntry, ReplyAttr, ReplyDirectory, ReplyData};
+use fuse::{Filesystem, Request, ReplyEntry, ReplyAttr, ReplyDirectory, ReplyData, FileAttr, FileType};
 use libc::ENOENT;
 use std::ffi::OsStr;
+use time::Timespec;
 
 struct MemFs {
     data: SimpleFsData,
 }
 
+const CREATE_TIME: Timespec = Timespec { sec: 1494802762, nsec: 0 };
+
+fn getAttr(file: SimpleFsData) -> FileAttr {
+    fn fileAttr(ino: u64, len: usize) -> FileAttr {
+        FileAttr {
+            ino: ino,
+            size: len as u64,
+            blocks: 1,
+            atime: CREATE_TIME,
+            mtime: CREATE_TIME,
+            ctime: CREATE_TIME,
+            crtime: CREATE_TIME,
+            kind: FileType::RegularFile,
+            perm: 0o755,
+            nlink: 1,
+            uid: 501,
+            gid: 20,
+            rdev: 0,
+            flags: 0,
+        }
+    }
+
+    fn dirAttr(ino: u64, children: usize) -> FileAttr {
+        FileAttr {
+            ino: ino,
+            size: 0,
+            blocks: 1,
+            atime: CREATE_TIME,
+            mtime: CREATE_TIME,
+            ctime: CREATE_TIME,
+            crtime: CREATE_TIME,
+            kind: FileType::Directory,
+            perm: 0o755,
+            nlink: children as u32,
+            uid: 501,
+            gid: 20,
+            rdev: 0,
+            flags: 0,
+        }
+    }
+
+    match file {
+        SimpleFsData::File(ino, name) => fileAttr(ino, name.len()),
+        SimpleFsData::Directory(ino, children) => dirAttr(ino, children.len()),
+    }
+}
+
 impl Filesystem for MemFs {
     fn lookup(&mut self, _req: &Request, _parent: u64, _name: &OsStr,
               reply: ReplyEntry) {
-- 
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