Mercurial > hg > mercurial-crew-with-dirclash
annotate contrib/hgsh/hgsh.c @ 3432:028fff46a4ac
Add branchtags function with cache
- cache stores tipmost node and rev and node,label pairs
- if cache is out of date, scan new changesets
- write new cache out after scan
author | Matt Mackall <mpm@selenic.com> |
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date | Tue, 17 Oct 2006 18:31:18 -0500 |
parents | 9cbeef33eaa3 |
children | 59ddd43f609f |
rev | line source |
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1 /* |
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2 * hgsh.c - restricted login shell for mercurial |
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3 * |
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4 * Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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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, incorporated herein by reference. |
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8 * |
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9 * this program is login shell for dedicated mercurial user account. it |
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10 * only allows few actions: |
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11 * |
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12 * 1. run hg in server mode on specific repository. no other hg commands |
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13 * are allowed. we try to verify that repo to be accessed exists under |
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14 * given top-level directory. |
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15 * |
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16 * 2. (optional) forward ssh connection from firewall/gateway machine to |
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17 * "real" mercurial host, to let users outside intranet pull and push |
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18 * changes through firewall. |
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19 * |
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20 * 3. (optional) run normal shell, to allow to "su" to mercurial user, use |
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21 * "sudo" to run programs as that user, or run cron jobs as that user. |
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22 * |
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23 * only tested on linux yet. patches for non-linux systems welcome. |
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24 */ |
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25 |
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26 #ifndef _GNU_SOURCE |
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27 #define _GNU_SOURCE /* for asprintf */ |
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28 #endif |
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29 |
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30 #include <stdio.h> |
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31 #include <stdlib.h> |
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32 #include <string.h> |
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33 #include <sys/stat.h> |
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34 #include <sys/types.h> |
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35 #include <sysexits.h> |
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36 #include <unistd.h> |
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37 |
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38 /* |
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39 * user config. |
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40 * |
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41 * if you see a hostname below, just use first part of hostname. example, |
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42 * if you have host named foo.bar.com, use "foo". |
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43 */ |
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44 |
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45 /* |
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46 * HG_GATEWAY: hostname of gateway/firewall machine that people outside your |
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47 * intranet ssh into if they need to ssh to other machines. if you do not |
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48 * have such machine, set to NULL. |
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49 */ |
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50 #ifndef HG_GATEWAY |
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51 #define HG_GATEWAY "gateway" |
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52 #endif |
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53 |
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54 /* |
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55 * HG_HOST: hostname of mercurial server. if any machine is allowed, set to |
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56 * NULL. |
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57 */ |
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58 #ifndef HG_HOST |
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59 #define HG_HOST "mercurial" |
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60 #endif |
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61 |
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62 /* |
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63 * HG_USER: username to log in from HG_GATEWAY to HG_HOST. if gateway and |
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64 * host username are same, set to NULL. |
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65 */ |
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66 #ifndef HG_USER |
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67 #define HG_USER "hg" |
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68 #endif |
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69 |
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70 /* |
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71 * HG_ROOT: root of tree full of mercurial repos. if you do not want to |
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72 * validate location of repo when someone is try to access, set to NULL. |
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73 */ |
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74 #ifndef HG_ROOT |
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75 #define HG_ROOT "/home/hg/repos" |
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76 #endif |
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77 |
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78 /* |
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79 * HG: path to the mercurial executable to run. |
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80 */ |
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81 #ifndef HG |
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82 #define HG "/home/hg/bin/hg" |
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83 #endif |
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84 |
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85 /* |
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86 * HG_SHELL: shell to use for actions like "sudo" and "su" access to |
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87 * mercurial user, and cron jobs. if you want to make these things |
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88 * impossible, set to NULL. |
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89 */ |
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90 #ifndef HG_SHELL |
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91 #define HG_SHELL NULL |
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92 // #define HG_SHELL "/bin/bash" |
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93 #endif |
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94 |
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95 /* |
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96 * HG_HELP: some way for users to get support if they have problem. if they |
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97 * should not get helpful message, set to NULL. |
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98 */ |
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99 #ifndef HG_HELP |
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100 #define HG_HELP "please contact support@example.com for help." |
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101 #endif |
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102 |
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103 /* |
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104 * SSH: path to ssh executable to run, if forwarding from HG_GATEWAY to |
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105 * HG_HOST. if you want to use rsh instead (why?), you need to modify |
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106 * arguments it is called with. see forward_through_gateway. |
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107 */ |
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108 #ifndef SSH |
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109 #define SSH "/usr/bin/ssh" |
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110 #endif |
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111 |
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112 /* |
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113 * tell whether to print command that is to be executed. useful for |
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114 * debugging. should not interfere with mercurial operation, since |
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115 * mercurial only cares about stdin and stdout, and this prints to stderr. |
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116 */ |
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117 static const int debug = 0; |
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118 |
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119 static void print_cmdline(int argc, char **argv) |
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120 { |
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121 FILE *fp = stderr; |
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122 int i; |
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123 |
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124 fputs("command: ", fp); |
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125 |
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126 for (i = 0; i < argc; i++) { |
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127 char *spc = strpbrk(argv[i], " \t\r\n"); |
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128 if (spc) { |
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129 fputc('\'', fp); |
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130 } |
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131 fputs(argv[i], fp); |
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132 if (spc) { |
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133 fputc('\'', fp); |
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134 } |
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135 if (i < argc - 1) { |
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136 fputc(' ', fp); |
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137 } |
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138 } |
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139 fputc('\n', fp); |
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140 fflush(fp); |
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141 } |
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142 |
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143 static void usage(const char *reason, int exitcode) |
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144 { |
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145 char *hg_help = HG_HELP; |
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146 |
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147 if (reason) { |
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148 fprintf(stderr, "*** Error: %s.\n", reason); |
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149 } |
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150 fprintf(stderr, "*** This program has been invoked incorrectly.\n"); |
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151 if (hg_help) { |
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152 fprintf(stderr, "*** %s\n", hg_help); |
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153 } |
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154 exit(exitcode ? exitcode : EX_USAGE); |
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155 } |
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156 |
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157 /* |
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158 * run on gateway host to make another ssh connection, to "real" mercurial |
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159 * server. it sends its command line unmodified to far end. |
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160 * |
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161 * never called if HG_GATEWAY is NULL. |
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162 */ |
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163 static void forward_through_gateway(int argc, char **argv) |
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164 { |
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165 char *ssh = SSH; |
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166 char *hg_host = HG_HOST; |
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167 char *hg_user = HG_USER; |
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168 char **nargv = alloca((10 + argc) * sizeof(char *)); |
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169 int i = 0, j; |
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170 |
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171 nargv[i++] = ssh; |
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172 nargv[i++] = "-q"; |
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173 nargv[i++] = "-T"; |
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174 nargv[i++] = "-x"; |
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175 if (hg_user) { |
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176 nargv[i++] = "-l"; |
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177 nargv[i++] = hg_user; |
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178 } |
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179 nargv[i++] = hg_host; |
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180 |
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181 /* |
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182 * sshd called us with added "-c", because it thinks we are a shell. |
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183 * drop it if we find it. |
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184 */ |
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185 j = 1; |
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186 if (j < argc && strcmp(argv[j], "-c") == 0) { |
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187 j++; |
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188 } |
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189 |
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190 for (; j < argc; i++, j++) { |
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191 nargv[i] = argv[j]; |
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192 } |
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193 nargv[i] = NULL; |
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194 |
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195 if (debug) { |
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196 print_cmdline(i, nargv); |
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197 } |
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198 |
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199 execv(ssh, nargv); |
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200 perror(ssh); |
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201 exit(EX_UNAVAILABLE); |
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202 } |
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203 |
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204 /* |
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205 * run shell. let administrator "su" to mercurial user's account to do |
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206 * administrative works. |
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207 * |
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208 * never called if HG_SHELL is NULL. |
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209 */ |
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210 static void run_shell(int argc, char **argv) |
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211 { |
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212 char *hg_shell = HG_SHELL; |
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213 char **nargv; |
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214 char *c; |
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215 int i; |
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216 |
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217 nargv = alloca((argc + 3) * sizeof(char *)); |
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218 c = strrchr(hg_shell, '/'); |
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219 |
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220 /* tell "real" shell it is login shell, if needed. */ |
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221 |
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222 if (argv[0][0] == '-' && c) { |
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223 nargv[0] = strdup(c); |
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224 if (nargv[0] == NULL) { |
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225 perror("malloc"); |
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226 exit(EX_OSERR); |
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227 } |
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228 nargv[0][0] = '-'; |
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229 } else { |
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230 nargv[0] = hg_shell; |
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231 } |
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232 |
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233 for (i = 1; i < argc; i++) { |
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234 nargv[i] = argv[i]; |
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235 } |
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236 nargv[i] = NULL; |
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237 |
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238 if (debug) { |
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239 print_cmdline(i, nargv); |
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240 } |
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241 |
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242 execv(hg_shell, nargv); |
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243 perror(hg_shell); |
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244 exit(EX_OSFILE); |
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245 } |
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246 |
2602
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247 enum cmdline { |
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248 hg_init, |
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249 hg_serve, |
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250 }; |
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251 |
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252 |
2341
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253 /* |
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254 * paranoid wrapper, runs hg executable in server mode. |
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255 */ |
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256 static void serve_data(int argc, char **argv) |
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257 { |
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258 char *hg_root = HG_ROOT; |
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259 char *repo, *repo_root; |
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260 enum cmdline cmd; |
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261 char *nargv[6]; |
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262 struct stat st; |
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263 size_t repolen; |
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264 int i; |
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265 |
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266 /* |
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267 * check argv for looking okay. we should be invoked with argv |
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268 * resembling like this: |
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269 * |
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270 * hgsh |
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271 * -c |
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272 * hg -R some/path serve --stdio |
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273 * |
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274 * the "-c" is added by sshd, because it thinks we are login shell. |
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275 */ |
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276 |
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277 if (argc != 3) { |
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278 goto badargs; |
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279 } |
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280 |
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281 if (strcmp(argv[1], "-c") != 0) { |
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282 goto badargs; |
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283 } |
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284 |
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285 if (sscanf(argv[2], "hg init %as", &repo) == 1) { |
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286 cmd = hg_init; |
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287 } |
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288 else if (sscanf(argv[2], "hg -R %as serve --stdio", &repo) == 1) { |
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289 cmd = hg_serve; |
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290 } else { |
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291 goto badargs; |
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292 } |
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293 |
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294 repolen = repo ? strlen(repo) : 0; |
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295 |
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296 if (repolen == 0) { |
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297 goto badargs; |
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298 } |
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299 |
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300 if (hg_root) { |
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301 if (asprintf(&repo_root, "%s/%s/", hg_root, repo) == -1) { |
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302 goto badargs; |
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303 } |
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304 |
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305 /* |
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306 * attempt to stop break out from inside the repository tree. could |
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307 * do something more clever here, because e.g. we could traverse a |
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308 * symlink that looks safe, but really breaks us out of tree. |
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309 */ |
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310 |
2602
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311 if (strstr(repo_root, "/../") != NULL) { |
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312 goto badargs; |
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313 } |
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314 |
2602
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315 /* only hg init expects no repo. */ |
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316 |
2602
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317 if (cmd != hg_init) { |
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318 char *abs_path; |
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319 |
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320 if (asprintf(&abs_path, "%s.hg/data", repo_root) == -1) { |
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321 goto badargs; |
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322 } |
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323 |
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324 /* verify that we really are looking at valid repo. */ |
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325 |
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326 if (stat(abs_path, &st) == -1) { |
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327 perror(repo); |
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328 exit(EX_DATAERR); |
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329 } |
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330 } |
2341
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331 |
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332 if (chdir(hg_root) == -1) { |
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333 perror(hg_root); |
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|
334 exit(EX_SOFTWARE); |
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|
335 } |
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|
336 } |
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|
337 |
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338 i = 0; |
2602
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339 |
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340 switch (cmd) { |
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341 case hg_serve: |
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342 nargv[i++] = HG; |
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343 nargv[i++] = "-R"; |
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344 nargv[i++] = repo; |
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345 nargv[i++] = "serve"; |
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346 nargv[i++] = "--stdio"; |
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347 break; |
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348 case hg_init: |
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349 nargv[i++] = HG; |
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350 nargv[i++] = "init"; |
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351 nargv[i++] = repo; |
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352 break; |
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|
353 } |
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|
354 |
2341
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355 nargv[i] = NULL; |
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|
356 |
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357 if (debug) { |
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358 print_cmdline(i, nargv); |
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|
359 } |
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parents:
diff
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|
360 |
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361 execv(HG, nargv); |
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362 perror(HG); |
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|
363 exit(EX_UNAVAILABLE); |
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diff
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|
364 |
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parents:
diff
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|
365 badargs: |
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366 /* print useless error message. */ |
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|
367 |
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368 usage("invalid arguments", EX_DATAERR); |
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|
369 } |
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Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff
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|
370 |
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|
371 int main(int argc, char **argv) |
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|
372 { |
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parents:
diff
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|
373 char host[1024]; |
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parents:
diff
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|
374 char *c; |
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Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff
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375 |
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376 if (gethostname(host, sizeof(host)) == -1) { |
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377 perror("gethostname"); |
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378 exit(EX_OSERR); |
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379 } |
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380 |
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381 if ((c = strchr(host, '.')) != NULL) { |
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382 *c = '\0'; |
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383 } |
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384 |
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385 if (getenv("SSH_CLIENT")) { |
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386 char *hg_gateway = HG_GATEWAY; |
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387 char *hg_host = HG_HOST; |
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388 |
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389 if (hg_gateway && strcmp(host, hg_gateway) == 0) { |
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390 forward_through_gateway(argc, argv); |
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391 } |
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392 |
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393 if (hg_host && strcmp(host, hg_host) != 0) { |
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394 usage("invoked on unexpected host", EX_USAGE); |
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395 } |
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396 |
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397 serve_data(argc, argv); |
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398 } else if (HG_SHELL) { |
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399 run_shell(argc, argv); |
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400 } else { |
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401 usage("invalid arguments", EX_DATAERR); |
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402 } |
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403 |
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404 return 0; |
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405 } |