src/bootstrap/clean.rs

   1 //! Implementation of `make clean` in rustbuild.
   2 //!
   3 //! Responsible for cleaning out a build directory of all old and stale
   4 //! artifacts to prepare for a fresh build. Currently doesn't remove the
   5 //! `build/cache` directory (download cache) or the `build/$target/llvm`
   6 //! directory unless the `--all` flag is present.
   7
   8 use std::fs;
   9 use std::io::{self, ErrorKind};
  10 use std::path::Path;
  11
  12 use crate::util::t;
  13 use crate::Build;
  14
  15 pub fn clean(build: &Build, all: bool) {
  16     rm_rf("tmp".as_ref());
  17
  18     if all {
  19         rm_rf(&build.out);
  20     } else {
  21         rm_rf(&build.out.join("tmp"));
  22         rm_rf(&build.out.join("dist"));
  23         rm_rf(&build.out.join("bootstrap"));
  24
  25         for host in &build.hosts {
  26             let entries = match build.out.join(host.triple).read_dir() {
  27                 Ok(iter) => iter,
  28                 Err(_) => continue,
  29             };
  30
  31             for entry in entries {
  32                 let entry = t!(entry);
  33                 if entry.file_name().to_str() == Some("llvm") {
  34                     continue;
  35                 }
  36                 let path = t!(entry.path().canonicalize());
  37                 rm_rf(&path);
  38             }
  39         }
  40     }
  41 }
  42
  43 fn rm_rf(path: &Path) {
  44     match path.symlink_metadata() {
  45         Err(e) => {
  46             if e.kind() == ErrorKind::NotFound {
  47                 return;
  48             }
  49             panic!("failed to get metadata for file {}: {}", path.display(), e);
  50         }
  51         Ok(metadata) => {
  52             if metadata.file_type().is_file() || metadata.file_type().is_symlink() {
  53                 do_op(path, "remove file", |p| {
  54                     fs::remove_file(p).or_else(|e| {
  55                         // Work around the fact that we cannot
  56                         // delete an executable while it runs on Windows.
  57                         #[cfg(windows)]
  58                         if e.kind() == std::io::ErrorKind::PermissionDenied
  59                             && p.file_name().and_then(std::ffi::OsStr::to_str)
  60                                 == Some("bootstrap.exe")
  61                         {
  62                             eprintln!("warning: failed to delete '{}'.", p.display());
  63                             return Ok(());
  64                         }
  65                         Err(e)
  66                     })
  67                 });
  68                 return;
  69             }
  70
  71             for file in t!(fs::read_dir(path)) {
  72                 rm_rf(&t!(file).path());
  73             }
  74             do_op(path, "remove dir", |p| {
  75                 fs::remove_dir(p).or_else(|e| {
  76                     // Check for dir not empty on Windows
  77                     // FIXME: Once `ErrorKind::DirectoryNotEmpty` is stabilized,
  78                     // match on `e.kind()` instead.
  79                     #[cfg(windows)]
  80                     if e.raw_os_error() == Some(145) {
  81                         return Ok(());
  82                     }
  83
  84                     Err(e)
  85                 })
  86             });
  87         }
  88     };
  89 }
  90
  91 fn do_op<F>(path: &Path, desc: &str, mut f: F)
  92 where
  93     F: FnMut(&Path) -> io::Result<()>,
  94 {
  95     match f(path) {
  96         Ok(()) => {}
  97         // On windows we can't remove a readonly file, and git will often clone files as readonly.
  98         // As a result, we have some special logic to remove readonly files on windows.
  99         // This is also the reason that we can't use things like fs::remove_dir_all().
 100         Err(ref e) if cfg!(windows) && e.kind() == ErrorKind::PermissionDenied => {
 101             let m = t!(path.symlink_metadata());
 102             let mut p = m.permissions();
 103             p.set_readonly(false);
 104             t!(fs::set_permissions(path, p));
 105             f(path).unwrap_or_else(|e| {
 106                 // Delete symlinked directories on Windows
 107                 #[cfg(windows)]
 108                 if m.file_type().is_symlink() && path.is_dir() && fs::remove_dir(path).is_ok() {
 109                     return;
 110                 }
 111                 panic!("failed to {} {}: {}", desc, path.display(), e);
 112             });
 113         }
 114         Err(e) => {
 115             panic!("failed to {} {}: {}", desc, path.display(), e);
 116         }
 117     }
 118 }