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 build_helper::t;
  13
  14 use crate::Build;
  15
  16 pub fn clean(build: &Build, all: bool) {
  17     rm_rf("tmp".as_ref());
  18
  19     if all {
  20         rm_rf(&build.out);
  21     } else {
  22         rm_rf(&build.out.join("tmp"));
  23         rm_rf(&build.out.join("dist"));
  24         rm_rf(&build.out.join("bootstrap"));
  25
  26         for host in &build.hosts {
  27             let entries = match build.out.join(host.triple).read_dir() {
  28                 Ok(iter) => iter,
  29                 Err(_) => continue,
  30             };
  31
  32             for entry in entries {
  33                 let entry = t!(entry);
  34                 if entry.file_name().to_str() == Some("llvm") {
  35                     continue;
  36                 }
  37                 let path = t!(entry.path().canonicalize());
  38                 rm_rf(&path);
  39             }
  40         }
  41     }
  42 }
  43
  44 fn rm_rf(path: &Path) {
  45     match path.symlink_metadata() {
  46         Err(e) => {
  47             if e.kind() == ErrorKind::NotFound {
  48                 return;
  49             }
  50             panic!("failed to get metadata for file {}: {}", path.display(), e);
  51         }
  52         Ok(metadata) => {
  53             if metadata.file_type().is_file() || metadata.file_type().is_symlink() {
  54                 do_op(path, "remove file", |p| {
  55                     fs::remove_file(p).or_else(|e| {
  56                         // Work around the fact that we cannot
  57                         // delete an executable while it runs on Windows.
  58                         #[cfg(windows)]
  59                         if e.kind() == std::io::ErrorKind::PermissionDenied
  60                             && p.file_name().and_then(std::ffi::OsStr::to_str)
  61                                 == Some("bootstrap.exe")
  62                         {
  63                             eprintln!("warning: failed to delete '{}'.", p.display());
  64                             return Ok(());
  65                         }
  66                         Err(e)
  67                     })
  68                 });
  69                 return;
  70             }
  71
  72             for file in t!(fs::read_dir(path)) {
  73                 rm_rf(&t!(file).path());
  74             }
  75             do_op(path, "remove dir", |p| {
  76                 fs::remove_dir(p).or_else(|e| {
  77                     // Check for dir not empty on Windows
  78                     // FIXME: Once `ErrorKind::DirectoryNotEmpty` is stabilized,
  79                     // match on `e.kind()` instead.
  80                     #[cfg(windows)]
  81                     if e.raw_os_error() == Some(145) {
  82                         return Ok(());
  83                     }
  84
  85                     Err(e)
  86                 })
  87             });
  88         }
  89     };
  90 }
  91
  92 fn do_op<F>(path: &Path, desc: &str, mut f: F)
  93 where
  94     F: FnMut(&Path) -> io::Result<()>,
  95 {
  96     match f(path) {
  97         Ok(()) => {}
  98         // On windows we can't remove a readonly file, and git will often clone files as readonly.
  99         // As a result, we have some special logic to remove readonly files on windows.
 100         // This is also the reason that we can't use things like fs::remove_dir_all().
 101         Err(ref e) if cfg!(windows) && e.kind() == ErrorKind::PermissionDenied => {
 102             let m = t!(path.symlink_metadata());
 103             let mut p = m.permissions();
 104             p.set_readonly(false);
 105             t!(fs::set_permissions(path, p));
 106             f(path).unwrap_or_else(|e| {
 107                 // Delete symlinked directories on Windows
 108                 #[cfg(windows)]
 109                 if m.file_type().is_symlink() && path.is_dir() && fs::remove_dir(path).is_ok() {
 110                     return;
 111                 }
 112                 panic!("failed to {} {}: {}", desc, path.display(), e);
 113             });
 114         }
 115         Err(e) => {
 116             panic!("failed to {} {}: {}", desc, path.display(), e);
 117         }
 118     }
 119 }