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1 | 1 | // dirstate.rs |
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2 | 2 | // |
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3 | 3 | // Copyright 2019 Raphaël Gomès <rgomes@octobus.net> |
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4 | 4 | // |
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5 | 5 | // This software may be used and distributed according to the terms of the |
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6 | 6 | // GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | //! Bindings for the `hg::dirstate` module provided by the |
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9 | 9 | //! `hg-core` package. |
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10 | 10 | //! |
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11 | 11 | //! From Python, this will be seen as `mercurial.rustext.dirstate` |
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12 | 12 | |
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13 | 13 | use cpython::{ |
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14 | 14 | exc, PyBytes, PyDict, PyErr, PyInt, PyModule, PyObject, PyResult, |
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15 | 15 | PySequence, PythonObject, PyTuple, Python, ToPyObject, |
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16 | 16 | }; |
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17 | 17 | use hg::{ |
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18 | 18 | pack_dirstate, parse_dirstate, CopyVecEntry, DirstateEntry, |
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19 | 19 | DirstatePackError, DirstateParents, DirstateParseError, DirstateVec, |
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20 | 20 | }; |
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21 | 21 | use std::collections::HashMap; |
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22 | 22 | use std::ffi::CStr; |
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23 | 23 | #[cfg(feature = "python27")] |
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24 | 24 | extern crate python27_sys as python_sys; |
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25 | 25 | #[cfg(feature = "python3")] |
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26 | 26 | extern crate python3_sys as python_sys; |
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27 | 27 | use self::python_sys::PyCapsule_Import; |
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28 | 28 | use libc::{c_char, c_int}; |
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29 | 29 | use std::mem::transmute; |
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30 | 30 | |
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31 | 31 | /// C code uses a custom `dirstate_tuple` type, checks in multiple instances |
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32 | 32 | /// for this type, and raises a Python `Exception` if the check does not pass. |
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33 | 33 | /// Because this type differs only in name from the regular Python tuple, it |
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34 | 34 | /// would be a good idea in the near future to remove it entirely to allow |
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35 | 35 | /// for a pure Python tuple of the same effective structure to be used, |
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36 | 36 | /// rendering this type and the capsule below useless. |
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37 | 37 | type MakeDirstateTupleFn = extern "C" fn( |
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38 | 38 | state: c_char, |
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39 | 39 | mode: c_int, |
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40 | 40 | size: c_int, |
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41 | 41 | mtime: c_int, |
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42 | 42 | ) -> PyObject; |
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43 | 43 | |
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44 | 44 | /// This is largely a copy/paste from cindex.rs, pending the merge of a |
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45 | 45 | /// `py_capsule_fn!` macro in the rust-cpython project: |
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46 | 46 | /// https://github.com/dgrunwald/rust-cpython/pull/169 |
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47 | 47 | fn decapsule_make_dirstate_tuple(py: Python) -> PyResult<MakeDirstateTupleFn> { |
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48 | 48 | unsafe { |
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49 | 49 | let caps_name = CStr::from_bytes_with_nul_unchecked( |
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50 | 50 | b"mercurial.cext.parsers.make_dirstate_tuple_CAPI\0", |
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51 | 51 | ); |
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52 | 52 | let from_caps = PyCapsule_Import(caps_name.as_ptr(), 0); |
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53 | 53 | if from_caps.is_null() { |
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54 | 54 | return Err(PyErr::fetch(py)); |
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55 | 55 | } |
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56 | 56 | Ok(transmute(from_caps)) |
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57 | 57 | } |
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58 | 58 | } |
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59 | 59 | |
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60 | 60 | fn parse_dirstate_wrapper( |
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61 | 61 | py: Python, |
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62 | 62 | dmap: PyDict, |
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63 | 63 | copymap: PyDict, |
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64 | 64 | st: PyBytes, |
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65 | 65 | ) -> PyResult<PyTuple> { |
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66 | 66 | match parse_dirstate(st.data(py)) { |
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67 | 67 | Ok((parents, dirstate_vec, copies)) => { |
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68 | 68 | for (filename, entry) in dirstate_vec { |
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69 | 69 | dmap.set_item( |
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70 | 70 | py, |
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71 | 71 | PyBytes::new(py, &filename[..]), |
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72 | 72 | decapsule_make_dirstate_tuple(py)?( |
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73 | entry.state, | |
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73 | entry.state as c_char, | |
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74 | 74 | entry.mode, |
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75 | 75 | entry.size, |
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76 | 76 | entry.mtime, |
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77 | 77 | ), |
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78 | 78 | )?; |
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79 | 79 | } |
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80 | 80 | for CopyVecEntry { path, copy_path } in copies { |
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81 | 81 | copymap.set_item( |
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82 | 82 | py, |
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83 | 83 | PyBytes::new(py, path), |
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84 | 84 | PyBytes::new(py, copy_path), |
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85 | 85 | )?; |
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86 | 86 | } |
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87 | 87 | Ok((PyBytes::new(py, parents.p1), PyBytes::new(py, parents.p2)) |
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88 | 88 | .to_py_object(py)) |
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89 | 89 | } |
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90 | 90 | Err(e) => Err(PyErr::new::<exc::ValueError, _>( |
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91 | 91 | py, |
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92 | 92 | match e { |
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93 | 93 | DirstateParseError::TooLittleData => { |
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94 | 94 | "too little data for parents".to_string() |
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95 | 95 | } |
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96 | 96 | DirstateParseError::Overflow => { |
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97 | 97 | "overflow in dirstate".to_string() |
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98 | 98 | } |
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99 | 99 | DirstateParseError::CorruptedEntry(e) => e, |
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100 | 100 | }, |
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101 | 101 | )), |
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102 | 102 | } |
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103 | 103 | } |
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104 | 104 | |
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105 | 105 | fn pack_dirstate_wrapper( |
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106 | 106 | py: Python, |
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107 | 107 | dmap: PyDict, |
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108 | 108 | copymap: PyDict, |
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109 | 109 | pl: PyTuple, |
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110 | 110 | now: PyInt, |
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111 | 111 | ) -> PyResult<PyBytes> { |
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112 | 112 | let p1 = pl.get_item(py, 0).extract::<PyBytes>(py)?; |
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113 | 113 | let p1: &[u8] = p1.data(py); |
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114 | 114 | let p2 = pl.get_item(py, 1).extract::<PyBytes>(py)?; |
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115 | 115 | let p2: &[u8] = p2.data(py); |
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116 | 116 | |
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117 | 117 | let dirstate_vec: Result<DirstateVec, PyErr> = dmap |
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118 | 118 | .items(py) |
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119 | 119 | .iter() |
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120 | 120 | .map(|(filename, stats)| { |
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121 | 121 | let stats = stats.extract::<PySequence>(py)?; |
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122 | 122 | let state = stats.get_item(py, 0)?.extract::<PyBytes>(py)?; |
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123 | 123 | let state = state.data(py)[0] as i8; |
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124 | 124 | let mode = stats.get_item(py, 1)?.extract(py)?; |
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125 | 125 | let size = stats.get_item(py, 2)?.extract(py)?; |
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126 | 126 | let mtime = stats.get_item(py, 3)?.extract(py)?; |
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127 | 127 | let filename = filename.extract::<PyBytes>(py)?; |
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128 | 128 | let filename = filename.data(py); |
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129 | 129 | Ok(( |
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130 | 130 | filename.to_owned(), |
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131 | 131 | DirstateEntry { |
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132 | 132 | state, |
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133 | 133 | mode, |
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134 | 134 | size, |
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135 | 135 | mtime, |
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136 | 136 | }, |
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137 | 137 | )) |
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138 | 138 | }) |
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139 | 139 | .collect(); |
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140 | 140 | |
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141 | 141 | let copies: Result<HashMap<Vec<u8>, Vec<u8>>, PyErr> = copymap |
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142 | 142 | .items(py) |
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143 | 143 | .iter() |
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144 | 144 | .map(|(key, value)| { |
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145 | 145 | Ok(( |
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146 | 146 | key.extract::<PyBytes>(py)?.data(py).to_owned(), |
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147 | 147 | value.extract::<PyBytes>(py)?.data(py).to_owned(), |
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148 | 148 | )) |
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149 | 149 | }) |
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150 | 150 | .collect(); |
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151 | 151 | |
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152 | 152 | match pack_dirstate( |
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153 | 153 | &dirstate_vec?, |
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154 | 154 | &copies?, |
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155 | 155 | DirstateParents { p1, p2 }, |
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156 | 156 | now.as_object().extract::<i32>(py)?, |
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157 | 157 | ) { |
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158 | 158 | Ok((packed, new_dirstate_vec)) => { |
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159 | 159 | for ( |
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160 | 160 | filename, |
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161 | 161 | DirstateEntry { |
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162 | 162 | state, |
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163 | 163 | mode, |
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164 | 164 | size, |
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165 | 165 | mtime, |
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166 | 166 | }, |
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167 | 167 | ) in new_dirstate_vec |
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168 | 168 | { |
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169 | 169 | dmap.set_item( |
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170 | 170 | py, |
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171 | 171 | PyBytes::new(py, &filename[..]), |
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172 | 172 | decapsule_make_dirstate_tuple(py)?( |
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173 | state, mode, size, mtime, | |
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173 | state as c_char, mode, size, mtime, | |
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174 | 174 | ), |
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175 | 175 | )?; |
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176 | 176 | } |
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177 | 177 | Ok(PyBytes::new(py, &packed)) |
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178 | 178 | } |
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179 | 179 | Err(error) => Err(PyErr::new::<exc::ValueError, _>( |
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180 | 180 | py, |
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181 | 181 | match error { |
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182 | 182 | DirstatePackError::CorruptedParent => { |
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183 | 183 | "expected a 20-byte hash".to_string() |
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184 | 184 | } |
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185 | 185 | DirstatePackError::CorruptedEntry(e) => e, |
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186 | 186 | DirstatePackError::BadSize(expected, actual) => { |
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187 | 187 | format!("bad dirstate size: {} != {}", actual, expected) |
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188 | 188 | } |
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189 | 189 | }, |
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190 | 190 | )), |
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191 | 191 | } |
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192 | 192 | } |
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193 | 193 | |
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194 | 194 | /// Create the module, with `__package__` given from parent |
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195 | 195 | pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> { |
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196 | 196 | let dotted_name = &format!("{}.dirstate", package); |
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197 | 197 | let m = PyModule::new(py, dotted_name)?; |
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198 | 198 | m.add(py, "__package__", package)?; |
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199 | 199 | m.add(py, "__doc__", "Dirstate - Rust implementation")?; |
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200 | 200 | m.add( |
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201 | 201 | py, |
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202 | 202 | "parse_dirstate", |
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203 | 203 | py_fn!( |
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204 | 204 | py, |
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205 | 205 | parse_dirstate_wrapper(dmap: PyDict, copymap: PyDict, st: PyBytes) |
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206 | 206 | ), |
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207 | 207 | )?; |
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208 | 208 | m.add( |
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209 | 209 | py, |
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210 | 210 | "pack_dirstate", |
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211 | 211 | py_fn!( |
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212 | 212 | py, |
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213 | 213 | pack_dirstate_wrapper( |
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214 | 214 | dmap: PyDict, |
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215 | 215 | copymap: PyDict, |
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216 | 216 | pl: PyTuple, |
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217 | 217 | now: PyInt |
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218 | 218 | ) |
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219 | 219 | ), |
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220 | 220 | )?; |
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221 | 221 | |
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222 | 222 | let sys = PyModule::import(py, "sys")?; |
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223 | 223 | let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?; |
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224 | 224 | sys_modules.set_item(py, dotted_name, &m)?; |
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225 | 225 | |
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226 | 226 | Ok(m) |
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227 | 227 | } |
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