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annotate rust/hg-cpython/src/vfs.rs @ 52178:bd8081e9fd62

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rust: don't star export from the `revlog` module This made a lot of the imports confusing because they didn't make sense at the top level (so, outside of `revlog`), and they hide the more common types when autocompleting.
author Rapha?l Gom?s <rgomes@octobus.net>
date Thu, 26 Sep 2024 14:26:24 +0200
parents 72bc29f01570
children 735bf027dd1d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use std::{
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2 cell::Cell,
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3 fs::File,
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4 io::Error,
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5 os::fd::{AsRawFd, FromRawFd},
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6 path::{Path, PathBuf},
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7 };
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8
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9 use cpython::{
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10 ObjectProtocol, PyBytes, PyClone, PyDict, PyErr, PyInt, PyObject,
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11 PyResult, PyTuple, Python, PythonObject, ToPyObject,
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12 };
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13 use hg::{
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14 errors::{HgError, IoResultExt},
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15 exit_codes,
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16 utils::files::{get_bytes_from_path, get_path_from_bytes},
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17 vfs::Vfs,
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18 };
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19
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20 /// Wrapper around a Python VFS object to call back into Python from `hg-core`.
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21 pub struct PyVfs {
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22 inner: PyObject,
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23 base: PathBuf,
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24 }
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25
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26 impl Clone for PyVfs {
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27 fn clone(&self) -> Self {
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28 let gil = &Python::acquire_gil();
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29 let py = gil.python();
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30 Self {
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31 inner: self.inner.clone_ref(py),
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32 base: self.base.clone(),
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33 }
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34 }
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35 }
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36
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37 impl PyVfs {
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38 pub fn new(
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39 _py: Python,
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40 py_vfs: PyObject,
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41 base: PathBuf,
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42 ) -> PyResult<Self> {
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43 Ok(Self {
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44 inner: py_vfs,
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45 base,
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46 })
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47 }
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48
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49 fn inner_open(
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50 &self,
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51 filename: &Path,
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52 create: bool,
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53 check_ambig: bool,
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54 atomic_temp: bool,
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55 write: bool,
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56 ) -> Result<(File, Option<PathBuf>), HgError> {
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57 let gil = &Python::acquire_gil();
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58 let py = gil.python();
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59 let mode = if atomic_temp {
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60 PyBytes::new(py, b"w")
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61 } else if create {
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62 PyBytes::new(py, b"w+")
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63 } else if write {
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64 PyBytes::new(py, b"r+")
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65 } else {
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66 PyBytes::new(py, b"rb")
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67 };
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68 let res = self.inner.call(
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69 py,
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70 (
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71 PyBytes::new(py, &get_bytes_from_path(filename)),
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72 mode,
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73 atomic_temp,
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74 check_ambig,
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75 ),
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76 None,
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77 );
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78 match res {
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79 Ok(tup) => {
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80 let tup = tup
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81 .extract::<PyTuple>(py)
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82 .map_err(|e| vfs_error("vfs did not return a tuple", e))?;
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83 let fileno = tup.get_item(py, 0).extract(py).map_err(|e| {
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84 vfs_error("vfs did not return a valid fileno", e)
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85 })?;
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86 let temp_name = tup.get_item(py, 1);
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87 // Safety: this must be a valid owned file descriptor, and
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88 // Python has just given it to us, it will only exist here now
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89 let file = unsafe { File::from_raw_fd(fileno) };
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90 let temp_name = if atomic_temp {
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91 Some(
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92 get_path_from_bytes(
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93 temp_name
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94 .extract::<PyBytes>(py)
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95 .map_err(|e| vfs_error("invalid tempname", e))?
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96 .data(py),
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97 )
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98 .to_owned(),
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99 )
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100 } else {
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101 None
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102 };
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103 Ok((file, temp_name))
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104 }
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105 Err(mut e) => {
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106 // TODO surely there is a better way of comparing
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107 if e.instance(py).get_type(py).name(py) == "FileNotFoundError"
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108 {
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109 return Err(HgError::IoError {
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110 error: Error::new(
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111 std::io::ErrorKind::NotFound,
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112 e.instance(py).to_string(),
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113 ),
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114 context: hg::errors::IoErrorContext::ReadingFile(
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115 filename.to_owned(),
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116 ),
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117 });
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118 }
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119 Err(vfs_error("failed to call opener", e))
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120 }
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121 }
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122 }
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123 }
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124
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125 fn vfs_error(reason: impl Into<String>, mut error: PyErr) -> HgError {
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126 let gil = &Python::acquire_gil();
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127 let py = gil.python();
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128 HgError::abort(
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129 format!("{}: {}", reason.into(), error.instance(py)),
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130 exit_codes::ABORT,
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131 None,
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132 )
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133 }
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134
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135 py_class!(pub class PyFile |py| {
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136 data number: Cell<i32>;
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137
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138 def fileno(&self) -> PyResult<PyInt> {
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139 Ok(self.number(py).get().to_py_object(py))
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140 }
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141 });
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142
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143 impl Vfs for PyVfs {
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144 fn open(&self, filename: &Path) -> Result<File, HgError> {
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145 self.inner_open(filename, false, false, false, true)
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146 .map(|(f, _)| f)
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147 }
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148 fn open_read(&self, filename: &Path) -> Result<File, HgError> {
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149 self.inner_open(filename, false, false, false, false)
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150 .map(|(f, _)| f)
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151 }
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152
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153 fn open_check_ambig(
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154 &self,
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155 filename: &Path,
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156 ) -> Result<std::fs::File, HgError> {
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157 self.inner_open(filename, false, true, false, true)
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158 .map(|(f, _)| f)
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159 }
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160
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161 fn create(&self, filename: &Path) -> Result<std::fs::File, HgError> {
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162 self.inner_open(filename, true, false, false, true)
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163 .map(|(f, _)| f)
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164 }
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165
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166 fn create_atomic(
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167 &self,
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168 filename: &Path,
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169 check_ambig: bool,
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170 ) -> Result<hg::vfs::AtomicFile, HgError> {
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171 self.inner_open(filename, true, false, true, true).map(
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172 |(fp, temp_name)| {
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173 hg::vfs::AtomicFile::new(
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174 fp,
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175 check_ambig,
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176 temp_name.expect("temp name should exist"),
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177 filename.to_owned(),
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178 )
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179 },
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180 )
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181 }
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182
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183 fn file_size(&self, file: &File) -> Result<u64, HgError> {
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184 let gil = &Python::acquire_gil();
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185 let py = gil.python();
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186 let raw_fd = file.as_raw_fd();
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187 let py_fd = PyFile::create_instance(py, Cell::new(raw_fd))
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188 .expect("create_instance cannot fail");
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189 let fstat = self
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190 .inner
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191 .call_method(py, "fstat", (py_fd,), None)
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192 .map_err(|e| {
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193 vfs_error(format!("failed to fstat fd '{}'", raw_fd), e)
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194 })?;
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195 fstat
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196 .getattr(py, "st_size")
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197 .map(|v| {
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198 v.extract(py).map_err(|e| {
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199 vfs_error(format!("invalid size for fd '{}'", raw_fd), e)
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200 })
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201 })
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202 .map_err(|e| {
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203 vfs_error(format!("failed to get size of fd '{}'", raw_fd), e)
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204 })?
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205 }
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206
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207 fn exists(&self, filename: &Path) -> bool {
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208 let gil = &Python::acquire_gil();
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209 let py = gil.python();
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210 self.inner
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211 .call_method(
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212 py,
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213 "exists",
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214 (PyBytes::new(py, &get_bytes_from_path(filename)),),
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215 None,
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216 )
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217 .unwrap_or_else(|_| false.into_py_object(py).into_object())
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218 .extract(py)
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219 .unwrap()
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220 }
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221
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222 fn unlink(&self, filename: &Path) -> Result<(), HgError> {
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223 let gil = &Python::acquire_gil();
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224 let py = gil.python();
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225 if let Err(e) = self.inner.call_method(
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226 py,
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227 "unlink",
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228 (PyBytes::new(py, &get_bytes_from_path(filename)),),
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229 None,
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230 ) {
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231 return Err(vfs_error(
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232 format!("failed to unlink '{}'", filename.display()),
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233 e,
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234 ));
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235 }
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236 Ok(())
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237 }
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238
7346f93be7a4 revlog: add the glue to use the Rust `InnerRevlog` from Python
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239 fn rename(
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240 &self,
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241 from: &Path,
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242 to: &Path,
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243 check_ambig: bool,
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244 ) -> Result<(), HgError> {
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245 let gil = &Python::acquire_gil();
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246 let py = gil.python();
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247 let kwargs = PyDict::new(py);
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248 kwargs
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249 .set_item(py, "checkambig", check_ambig)
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250 .map_err(|e| vfs_error("dict setitem failed", e))?;
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251 if let Err(e) = self.inner.call_method(
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252 py,
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253 "rename",
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254 (
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255 PyBytes::new(py, &get_bytes_from_path(from)),
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256 PyBytes::new(py, &get_bytes_from_path(to)),
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257 ),
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258 Some(&kwargs),
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259 ) {
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260 let msg = format!(
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261 "failed to rename '{}' to '{}'",
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262 from.display(),
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263 to.display()
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264 );
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265 return Err(vfs_error(msg, e));
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266 }
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267 Ok(())
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268 }
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269
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270 fn copy(&self, from: &Path, to: &Path) -> Result<(), HgError> {
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271 let gil = &Python::acquire_gil();
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272 let py = gil.python();
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273 let from = self
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274 .inner
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275 .call_method(
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276 py,
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277 "join",
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278 (PyBytes::new(py, &get_bytes_from_path(from)),),
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279 None,
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280 )
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281 .unwrap();
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282 let from = from.extract::<PyBytes>(py).unwrap();
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283 let from = get_path_from_bytes(from.data(py));
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284 let to = self
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285 .inner
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286 .call_method(
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287 py,
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288 "join",
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289 (PyBytes::new(py, &get_bytes_from_path(to)),),
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290 None,
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291 )
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292 .unwrap();
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293 let to = to.extract::<PyBytes>(py).unwrap();
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294 let to = get_path_from_bytes(to.data(py));
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295 std::fs::copy(from, to).when_writing_file(to)?;
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296 Ok(())
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297 }
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298
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299 fn base(&self) -> &Path {
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300 &self.base
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301 }
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302 }