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annotate rust/chg/src/locator.rs @ 43886:fe0daceb51d0

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hgweb: fix error in docstring Despite the subtle semantic difference, this sentence really meant to say "overridden", not "overwritten".
author Jordi Guti?rrez Hermoso <jordigh@octave.org>
date Thu, 12 Dec 2019 11:41:28 -0500
parents ce088b38f92b
children c11d98cff883
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // Copyright 2011, 2018 Yuya Nishihara <yuya@tcha.org>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 //! Utility for locating command-server process.
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7
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8 use std::env;
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9 use std::ffi::{OsStr, OsString};
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10 use std::fs::{self, DirBuilder};
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11 use std::io;
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12 use std::os::unix::ffi::{OsStrExt, OsStringExt};
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13 use std::os::unix::fs::{DirBuilderExt, MetadataExt};
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14 use std::path::{Path, PathBuf};
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15 use std::process;
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16 use std::time::Duration;
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17
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18 use super::procutil;
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19
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20 /// Helper to connect to and spawn a server process.
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21 #[derive(Clone, Debug)]
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22 pub struct Locator {
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23 hg_command: OsString,
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24 current_dir: PathBuf,
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25 env_vars: Vec<(OsString, OsString)>,
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26 process_id: u32,
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27 base_sock_path: PathBuf,
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28 timeout: Duration,
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29 }
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30
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31 impl Locator {
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32 /// Creates locator capturing the current process environment.
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33 ///
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34 /// If no `$CHGSOCKNAME` is specified, the socket directory will be
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35 /// created as necessary.
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36 pub fn prepare_from_env() -> io::Result<Locator> {
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37 Ok(Locator {
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38 hg_command: default_hg_command(),
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39 current_dir: env::current_dir()?,
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40 env_vars: env::vars_os().collect(),
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41 process_id: process::id(),
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42 base_sock_path: prepare_server_socket_path()?,
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43 timeout: default_timeout(),
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44 })
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45 }
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46
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47 /// Temporary socket path for this client process.
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48 fn temp_sock_path(&self) -> PathBuf {
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49 let src = self.base_sock_path.as_os_str().as_bytes();
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50 let mut buf = Vec::with_capacity(src.len() + 6);
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51 buf.extend_from_slice(src);
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52 buf.extend_from_slice(format!(".{}", self.process_id).as_bytes());
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53 OsString::from_vec(buf).into()
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54 }
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55 }
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56
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57 /// Determines the server socket to connect to.
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58 ///
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59 /// If no `$CHGSOCKNAME` is specified, the socket directory will be created
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60 /// as necessary.
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61 pub fn prepare_server_socket_path() -> io::Result<PathBuf> {
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62 if let Some(s) = env::var_os("CHGSOCKNAME") {
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63 Ok(PathBuf::from(s))
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64 } else {
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65 let mut path = default_server_socket_dir();
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66 create_secure_dir(&path)?;
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67 path.push("server");
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68 Ok(path)
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69 }
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70 }
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71
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72 /// Determines the default server socket path as follows.
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73 ///
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74 /// 1. `$XDG_RUNTIME_DIR/chg`
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75 /// 2. `$TMPDIR/chg$UID`
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76 /// 3. `/tmp/chg$UID`
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77 pub fn default_server_socket_dir() -> PathBuf {
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78 // XDG_RUNTIME_DIR should be ignored if it has an insufficient permission.
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79 // https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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80 if let Some(Ok(s)) = env::var_os("XDG_RUNTIME_DIR").map(check_secure_dir) {
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81 let mut path = PathBuf::from(s);
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82 path.push("chg");
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83 path
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84 } else {
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85 let mut path = env::temp_dir();
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86 path.push(format!("chg{}", procutil::get_effective_uid()));
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87 path
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88 }
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89 }
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90
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91 /// Determines the default hg command.
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92 pub fn default_hg_command() -> OsString {
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93 // TODO: maybe allow embedding the path at compile time (or load from hgrc)
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94 env::var_os("CHGHG")
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95 .or(env::var_os("HG"))
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96 .unwrap_or(OsStr::new("hg").to_owned())
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97 }
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98
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99 fn default_timeout() -> Duration {
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100 let secs = env::var("CHGTIMEOUT")
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101 .ok()
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102 .and_then(|s| s.parse().ok())
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103 .unwrap_or(60);
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104 Duration::from_secs(secs)
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105 }
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106
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107 /// Creates a directory which the other users cannot access to.
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108 ///
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109 /// If the directory already exists, tests its permission.
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110 fn create_secure_dir<P>(path: P) -> io::Result<()>
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111 where
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112 P: AsRef<Path>,
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113 {
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114 DirBuilder::new()
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115 .mode(0o700)
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116 .create(path.as_ref())
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117 .or_else(|err| {
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118 if err.kind() == io::ErrorKind::AlreadyExists {
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119 check_secure_dir(path).map(|_| ())
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120 } else {
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121 Err(err)
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122 }
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123 })
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124 }
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125
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126 fn check_secure_dir<P>(path: P) -> io::Result<P>
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127 where
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128 P: AsRef<Path>,
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129 {
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130 let a = fs::symlink_metadata(path.as_ref())?;
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131 if a.is_dir() && a.uid() == procutil::get_effective_uid() && (a.mode() & 0o777) == 0o700 {
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132 Ok(path)
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133 } else {
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134 Err(io::Error::new(io::ErrorKind::Other, "insecure directory"))
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135 }
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136 }