catar/encoder.rs: first try

src/catar/encoder.rs

@@ -0,0 +1,82 @@
+use failure::*;
+
+use super::format_definition::*;
+
+use std::io::Write;
+use std::os::unix::io::AsRawFd;
+use std::os::unix::ffi::OsStrExt;
+
+pub struct CaTarEncoder<W: Write> {
+    current_path: std::path::PathBuf, // used for error reporting
+    writer: W,
+    size: usize,
+}
+
+impl <W: Write> CaTarEncoder<W> {
+
+    pub fn encode(mut path: std::path::PathBuf, dir: &mut nix::dir::Dir, writer: W) -> Result<(), Error> {
+        let mut me = Self {
+            current_path: path,
+            writer: writer,
+            size: 0,
+        };
+
+        // todo: use scandirat??
+
+        me.encode_dir(dir)?;
+
+        Ok(())
+    }
+
+    fn encode_dir(&mut self, dir: &mut nix::dir::Dir)  -> Result<(), Error> {
+
+        println!("encode_dir: {:?}", self.current_path);
+
+        let mut name_list = vec![];
+
+        let rawfd = dir.as_raw_fd();
+
+        let dir_stat = match nix::sys::stat::fstat(rawfd) {
+            Ok(stat) => stat,
+            Err(err) => bail!("fstat failed - {}", err),
+        };
+
+        for entry in dir.iter() {
+            let entry = match entry {
+                Ok(entry) => entry,
+                Err(err) => bail!("readir failed - {}", err),
+            };
+            let mut filename = entry.file_name().to_owned();
+
+            let name = filename.to_bytes_with_nul();
+            let name_len = name.len();
+            if name_len == 2 && name[0] == b'.' && name[1] == 0u8 { continue; }
+            if name_len == 3 && name[0] == b'.' && name[1] == b'.' && name[2] == 0u8 { continue; }
+
+            if let Ok(stat) = nix::sys::stat::fstatat(rawfd, filename.as_ref(), nix::fcntl::AtFlags::AT_SYMLINK_NOFOLLOW) {
+                //println!("Found {:?}", filename);
+                name_list.push((filename, stat));
+            } else {
+                bail!("fsstat failed");
+            }
+        }
+
+        name_list.sort_unstable_by(|a, b| a.0.cmp(&b.0));
+
+        for (filename, stat) in name_list {
+            //println!("SORTED {:?}", filename);
+
+            if (stat.st_mode & libc::S_IFDIR) != 0 {
+
+                let mut dir = nix::dir::Dir::openat(
+                    rawfd, filename.as_ref(), nix::fcntl::OFlag::O_NOFOLLOW, nix::sys::stat::Mode::empty())?;
+
+                self.current_path.push(std::ffi::OsStr::from_bytes(filename.as_bytes()));
+                self.encode_dir(&mut dir)?;
+                self.current_path.pop();
+            }
+        }
+
+        Ok(())
+    }
+}