From 7701c90fd67fe9598ba312cf0c0403c1d653bd75 Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 6 Nov 2017 10:19:54 -0800
Subject: work in progress on drive import/export

---
 src/bin/geniza-drive.rs | 17 ++++++++++++++++-
 src/drive.rs            | 34 ++++++++++++++++++++++++++++------
 2 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/src/bin/geniza-drive.rs b/src/bin/geniza-drive.rs
index 7f945b0..79ba480 100644
--- a/src/bin/geniza-drive.rs
+++ b/src/bin/geniza-drive.rs
@@ -44,6 +44,12 @@ fn run() -> Result<()> {
                 .arg_from_usage("<FILE> 'file to add'")
                 .arg_from_usage("--target <path> 'path to import the file to (if not top level)'")
         )
+        .subcommand(
+            SubCommand::with_name("export-file")
+                .about("Copies a file from dat archive to local disk")
+                .arg_from_usage("<FILE> 'file to export'")
+                .arg_from_usage("--target <path> 'path to save the file to (if not same name)'")
+        )
         .subcommand(
             SubCommand::with_name("log")
                 .about("History of additions/deletions from this dat")
@@ -61,7 +67,7 @@ fn run() -> Result<()> {
     let dir = Path::new(matches.value_of("dat-dir").unwrap());
     match matches.subcommand() {
         ("init", Some(_subm)) => {
-            let drive = DatDrive::create(dir)?;
+            let _drive = DatDrive::create(dir)?;
             // TODO: print public key in hex
             println!("Done!");
         }
@@ -82,6 +88,15 @@ fn run() -> Result<()> {
             drive.import_file(&path, &fpath)?;
 
         }
+        ("export-file", Some(subm)) => {
+            let path = Path::new(subm.value_of("FILE").unwrap());
+            let mut drive = DatDrive::open(dir, true)?;
+            let fpath = match subm.value_of("target") {
+                None => Path::new("/").join(path.file_name().unwrap()),
+                Some(p) => Path::new("/").join(p)
+            };
+            drive.export_file(&path, &fpath)?;
+        }
         ("cat", Some(subm)) => {
             let path = Path::new(subm.value_of("FILE").unwrap());
             let mut drive = DatDrive::open(dir, true)?;
diff --git a/src/drive.rs b/src/drive.rs
index 9aa6ea2..740e949 100644
--- a/src/drive.rs
+++ b/src/drive.rs
@@ -1,8 +1,8 @@
 
-use std::io::Read;
+use std::io::{Read, Write};
 use std::path::{Path, PathBuf};
-use std::os::unix::fs::MetadataExt;
-use std::fs::File;
+use std::os::unix::fs::{MetadataExt, OpenOptionsExt};
+use std::fs::{File, OpenOptions};
 use std::cmp::min;
 use std::ffi::OsStr;
 use protobuf::Message;
@@ -403,6 +403,7 @@ impl<'a> DatDrive {
         Ok(children)
     }
 
+    // XXX: needs test
     /// Copies Stat metadata and all content from a file in the "real" filesystem into the
     /// DatDrive.
     pub fn import_file<P: AsRef<Path>, Q: AsRef<Path>>(&mut self, source: P, dest: Q) -> Result<()> {
@@ -418,15 +419,36 @@ impl<'a> DatDrive {
         self.add_file(dest, &mut stat, in_file)
     }
 
+    // XXX: needs test
     /// Copies a file from the drive to the "real" filesystem, preserving Stat metadata.
-    pub fn export_file<P: AsRef<Path>, Q: AsRef<Path>>(&mut self, _source: P, _dest: Q) -> Result<()> {
-        unimplemented!()
+    pub fn export_file<P: AsRef<Path>, Q: AsRef<Path>>(&mut self, source: P, dest: Q) -> Result<()> {
+
+        let source = source.as_ref();
+        let de = self.get_file_entry(source)?;
+        if let Some(entry) = de {
+            let stat = entry.stat.unwrap();
+            let mut out_file = OpenOptions::new()
+                .create_new(true)
+                .write(true)
+                .mode(stat.get_mode())
+                .open(dest)?;
+            let offset = stat.get_offset();
+            let blocks = stat.get_blocks();
+            for i in offset..(offset+blocks) {
+                let chunk = self.content.get_data_entry(i)?;
+                out_file.write_all(&chunk)?;
+            }
+            // TODO: more outfile metadata (uid, guid, etc)
+        } else {
+            bail!("Couldn't find path: {}", source.display());
+        }
+
+        Ok(())
     }
 
     pub fn read_file_bytes<P: AsRef<Path>>(&mut self, path: P) -> Result<Vec<u8>> {
         let de = self.get_file_entry(path.as_ref())?;
         if let Some(entry) = de {
-            // XXX: read and concatonate chunks
             let stat = entry.stat.unwrap();
             let mut buf = vec![];
             let offset = stat.get_offset();
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