Mercurial > hg
annotate mercurial/exewrapper.c @ 32078:bf5e13e38390 stable
pager: use less as a fallback on Unix
This seems reasonable choice per discussion, and the default-default of Git.
See also the inline-comment for why.
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-April/097042.html
author | Yuya Nishihara <yuya@tcha.org> |
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date | Fri, 28 Apr 2017 20:51:14 +0900 |
parents | 0241dd94ed38 |
children | 31c6c4d27be7 |
rev | line source |
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1 /* |
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2 exewrapper.c - wrapper for calling a python script on Windows |
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3 |
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4 Copyright 2012 Adrian Buehlmann <adrian@cadifra.com> and others |
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5 |
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6 This software may be used and distributed according to the terms of the |
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7 GNU General Public License version 2 or any later version. |
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8 */ |
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9 |
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10 #include <stdio.h> |
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11 #include <windows.h> |
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12 |
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13 #include "hgpythonlib.h" |
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14 |
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15 #ifdef __GNUC__ |
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16 int strcat_s(char *d, size_t n, const char *s) |
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17 { |
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18 return !strncat(d, s, n); |
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19 } |
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20 int strcpy_s(char *d, size_t n, const char *s) |
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21 { |
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22 return !strncpy(d, s, n); |
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23 } |
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24 #endif |
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25 |
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26 |
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27 static char pyscript[MAX_PATH + 10]; |
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28 static char pyhome[MAX_PATH + 10]; |
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29 static char envpyhome[MAX_PATH + 10]; |
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30 static char pydllfile[MAX_PATH + 10]; |
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31 |
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32 int main(int argc, char *argv[]) |
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33 { |
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34 char *p; |
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35 int ret; |
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36 int i; |
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37 int n; |
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38 char **pyargv; |
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39 WIN32_FIND_DATA fdata; |
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40 HANDLE hfind; |
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41 const char *err; |
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42 HMODULE pydll; |
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43 void (__cdecl *Py_SetPythonHome)(char *home); |
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44 int (__cdecl *Py_Main)(int argc, char *argv[]); |
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45 |
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46 if (GetModuleFileName(NULL, pyscript, sizeof(pyscript)) == 0) |
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47 { |
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48 err = "GetModuleFileName failed"; |
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49 goto bail; |
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50 } |
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51 |
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52 p = strrchr(pyscript, '.'); |
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53 if (p == NULL) { |
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54 err = "malformed module filename"; |
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55 goto bail; |
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56 } |
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57 *p = 0; /* cut trailing ".exe" */ |
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58 strcpy_s(pyhome, sizeof(pyhome), pyscript); |
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59 |
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60 hfind = FindFirstFile(pyscript, &fdata); |
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61 if (hfind != INVALID_HANDLE_VALUE) { |
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62 /* pyscript exists, close handle */ |
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63 FindClose(hfind); |
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64 } else { |
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65 /* file pyscript isn't there, take <pyscript>exe.py */ |
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66 strcat_s(pyscript, sizeof(pyscript), "exe.py"); |
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67 } |
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68 |
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69 pydll = NULL; |
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70 |
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71 p = strrchr(pyhome, '\\'); |
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72 if (p == NULL) { |
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73 err = "can't find backslash in module filename"; |
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74 goto bail; |
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75 } |
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76 *p = 0; /* cut at directory */ |
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77 |
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78 /* check for private Python of HackableMercurial */ |
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79 strcat_s(pyhome, sizeof(pyhome), "\\hg-python"); |
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80 |
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81 hfind = FindFirstFile(pyhome, &fdata); |
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82 if (hfind != INVALID_HANDLE_VALUE) { |
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83 /* Path .\hg-python exists. We are probably in HackableMercurial |
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84 scenario, so let's load python dll from this dir. */ |
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85 FindClose(hfind); |
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86 strcpy_s(pydllfile, sizeof(pydllfile), pyhome); |
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87 strcat_s(pydllfile, sizeof(pydllfile), "\\" HGPYTHONLIB ".dll"); |
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88 pydll = LoadLibrary(pydllfile); |
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89 if (pydll == NULL) { |
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90 err = "failed to load private Python DLL " HGPYTHONLIB ".dll"; |
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91 goto bail; |
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92 } |
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93 Py_SetPythonHome = (void*)GetProcAddress(pydll, "Py_SetPythonHome"); |
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94 if (Py_SetPythonHome == NULL) { |
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95 err = "failed to get Py_SetPythonHome"; |
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96 goto bail; |
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97 } |
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98 Py_SetPythonHome(pyhome); |
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99 } |
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100 |
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101 if (pydll == NULL) { |
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102 pydll = LoadLibrary(HGPYTHONLIB ".dll"); |
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103 if (pydll == NULL) { |
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104 err = "failed to load Python DLL " HGPYTHONLIB ".dll"; |
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105 goto bail; |
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106 } |
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107 } |
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108 |
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109 Py_Main = (void*)GetProcAddress(pydll, "Py_Main"); |
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110 if (Py_Main == NULL) { |
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111 err = "failed to get Py_Main"; |
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112 goto bail; |
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113 } |
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114 |
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115 /* |
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116 Only add the pyscript to the args, if it's not already there. It may |
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117 already be there, if the script spawned a child process of itself, in |
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118 the same way as it got called, that is, with the pyscript already in |
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119 place. So we optionally accept the pyscript as the first argument |
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120 (argv[1]), letting our exe taking the role of the python interpreter. |
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121 */ |
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122 if (argc >= 2 && strcmp(argv[1], pyscript) == 0) { |
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123 /* |
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124 pyscript is already in the args, so there is no need to copy |
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125 the args and we can directly call the python interpreter with |
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126 the original args. |
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127 */ |
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128 return Py_Main(argc, argv); |
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129 } |
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130 |
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131 /* |
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132 Start assembling the args for the Python interpreter call. We put the |
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133 name of our exe (argv[0]) in the position where the python.exe |
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134 canonically is, and insert the pyscript next. |
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135 */ |
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136 pyargv = malloc((argc + 5) * sizeof(char*)); |
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137 if (pyargv == NULL) { |
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138 err = "not enough memory"; |
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139 goto bail; |
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140 } |
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141 n = 0; |
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142 pyargv[n++] = argv[0]; |
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143 pyargv[n++] = pyscript; |
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144 |
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145 /* copy remaining args from the command line */ |
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146 for (i = 1; i < argc; i++) |
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147 pyargv[n++] = argv[i]; |
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148 /* argv[argc] is guaranteed to be NULL, so we forward that guarantee */ |
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149 pyargv[n] = NULL; |
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150 |
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151 ret = Py_Main(n, pyargv); /* The Python interpreter call */ |
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152 |
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153 free(pyargv); |
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154 return ret; |
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155 |
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156 bail: |
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157 fprintf(stderr, "abort: %s\n", err); |
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158 return 255; |
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159 } |