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use std::collections::{HashSet, VecDeque};
use std::env;
use std::ffi::OsStr;
use std::fs;
use std::hash::Hash;
use std::io::{BufReader, BufRead, Error, ErrorKind};
use std::os::unix;
use std::path::{Component, Path, PathBuf};
use std::process::Command;
struct NonRepeatingQueue<T> {
queue: VecDeque<T>,
seen: HashSet<T>,
}
impl<T> NonRepeatingQueue<T> {
fn new() -> NonRepeatingQueue<T> {
NonRepeatingQueue {
queue: VecDeque::new(),
seen: HashSet::new(),
}
}
}
impl<T: Clone + Eq + Hash> NonRepeatingQueue<T> {
fn push_back(&mut self, value: T) -> bool {
if self.seen.contains(&value) {
false
} else {
self.seen.insert(value.clone());
self.queue.push_back(value);
true
}
}
fn pop_front(&mut self) -> Option<T> {
self.queue.pop_front()
}
}
fn patch_elf<S: AsRef<OsStr>, P: AsRef<OsStr>>(mode: S, path: P) -> Result<String, Error> {
let output = Command::new("patchelf")
.arg(&mode)
.arg(&path)
.output()?;
if output.status.success() {
Ok(String::from_utf8(output.stdout).expect("Failed to parse output"))
} else {
Err(Error::new(ErrorKind::Other, format!("failed: patchelf {:?} {:?}", OsStr::new(&mode), OsStr::new(&path))))
}
}
fn copy_file<P: AsRef<Path> + AsRef<OsStr>, S: AsRef<Path> + AsRef<OsStr>>(
source: P,
target: S,
queue: &mut NonRepeatingQueue<Box<Path>>,
) -> Result<(), Error> {
fs::copy(&source, &target)?;
if !Command::new("ldd").arg(&source).output()?.status.success() {
// Not dynamically linked - no need to recurse
return Ok(());
}
let rpath_string = patch_elf("--print-rpath", &source)?;
let needed_string = patch_elf("--print-needed", &source)?;
// Shared libraries don't have an interpreter
if let Ok(interpreter_string) = patch_elf("--print-interpreter", &source) {
queue.push_back(Box::from(Path::new(&interpreter_string.trim())));
}
let rpath = rpath_string.trim().split(":").map(|p| Box::<Path>::from(Path::new(p))).collect::<Vec<_>>();
for line in needed_string.lines() {
let mut found = false;
for path in &rpath {
let lib = path.join(line);
if lib.exists() {
// No need to recurse. The queue will bring it back round.
queue.push_back(Box::from(lib.as_path()));
found = true;
break;
}
}
if !found {
// glibc makes it tricky to make this an error because
// none of the files have a useful rpath.
println!("Warning: Couldn't satisfy dependency {} for {:?}", line, OsStr::new(&source));
}
}
// Make file writable to strip it
let mut permissions = fs::metadata(&target)?.permissions();
permissions.set_readonly(false);
fs::set_permissions(&target, permissions)?;
// Strip further than normal
if !Command::new("strip").arg("--strip-all").arg(OsStr::new(&target)).output()?.status.success() {
println!("{:?} was not successfully stripped.", OsStr::new(&target));
}
Ok(())
}
fn queue_dir<P: AsRef<Path>>(
source: P,
queue: &mut NonRepeatingQueue<Box<Path>>,
) -> Result<(), Error> {
for entry in fs::read_dir(source)? {
let entry = entry?;
// No need to recurse. The queue will bring us back round here on its own.
queue.push_back(Box::from(entry.path().as_path()));
}
Ok(())
}
fn handle_path(
root: &Path,
p: &Path,
queue: &mut NonRepeatingQueue<Box<Path>>,
) -> Result<(), Error> {
let mut source = PathBuf::new();
let mut target = Path::new(root).to_path_buf();
let mut iter = p.components().peekable();
while let Some(comp) = iter.next() {
match comp {
Component::Prefix(_) => panic!("This tool is not meant for Windows"),
Component::RootDir => {
target.clear();
target.push(root);
source.clear();
source.push("/");
}
Component::CurDir => {}
Component::ParentDir => {
// Don't over-pop the target if the path has too many ParentDirs
if source.pop() {
target.pop();
}
}
Component::Normal(name) => {
target.push(name);
source.push(name);
let typ = fs::symlink_metadata(&source)?.file_type();
if typ.is_file() && !target.exists() {
copy_file(&source, &target, queue)?;
} else if typ.is_symlink() {
let link_target = fs::read_link(&source)?;
// Create the link, then push its target to the queue
if !target.exists() {
unix::fs::symlink(&link_target, &target)?;
}
source.pop();
source.push(link_target);
while let Some(c) = iter.next() {
source.push(c);
}
let link_target_path = source.as_path();
if link_target_path.exists() {
queue.push_back(Box::from(link_target_path));
}
break;
} else if typ.is_dir() {
if !target.exists() {
fs::create_dir(&target)?;
}
// Only recursively copy if the directory is the target object
if iter.peek().is_none() {
queue_dir(&source, queue)?;
}
}
}
}
}
Ok(())
}
fn main() -> Result<(), Error> {
let args: Vec<String> = env::args().collect();
let input = fs::File::open(&args[1])?;
let output = &args[2];
let out_path = Path::new(output);
let mut queue = NonRepeatingQueue::<Box<Path>>::new();
let mut lines = BufReader::new(input).lines();
while let Some(obj) = lines.next() {
// Lines should always come in pairs
let obj = obj?;
let sym = lines.next().unwrap()?;
let obj_path = Path::new(&obj);
queue.push_back(Box::from(obj_path));
if !sym.is_empty() {
println!("{} -> {}", &sym, &obj);
// We don't care about preserving symlink structure here
// nearly as much as for the actual objects.
let link_string = format!("{}/{}", output, sym);
let link_path = Path::new(&link_string);
let mut link_parent = link_path.to_path_buf();
link_parent.pop();
fs::create_dir_all(link_parent)?;
unix::fs::symlink(obj_path, link_path)?;
}
}
while let Some(obj) = queue.pop_front() {
handle_path(out_path, &*obj, &mut queue)?;
}
Ok(())
}
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