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@@ -1,439 +1,457 b'' | |||
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1 | 1 | /* |
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2 | 2 | * A fast client for Mercurial command server |
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3 | 3 | * |
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4 | 4 | * Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org> |
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5 | 5 | * |
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6 | 6 | * This software may be used and distributed according to the terms of the |
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7 | 7 | * GNU General Public License version 2 or any later version. |
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8 | 8 | */ |
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9 | 9 | |
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10 | 10 | #include <assert.h> |
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11 | 11 | #include <errno.h> |
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12 | 12 | #include <fcntl.h> |
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13 | 13 | #include <signal.h> |
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14 | 14 | #include <stdio.h> |
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15 | 15 | #include <stdlib.h> |
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16 | 16 | #include <string.h> |
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17 | 17 | #include <sys/file.h> |
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18 | 18 | #include <sys/stat.h> |
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19 | 19 | #include <sys/types.h> |
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20 | 20 | #include <sys/un.h> |
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21 | 21 | #include <sys/wait.h> |
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22 | 22 | #include <time.h> |
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23 | 23 | #include <unistd.h> |
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24 | 24 | |
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25 | 25 | #include "hgclient.h" |
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26 | 26 | #include "procutil.h" |
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27 | 27 | #include "util.h" |
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28 | 28 | |
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29 | 29 | #ifndef PATH_MAX |
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30 | 30 | #define PATH_MAX 4096 |
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31 | 31 | #endif |
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32 | 32 | |
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33 | 33 | struct cmdserveropts { |
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34 | 34 | char sockname[PATH_MAX]; |
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35 | 35 | char initsockname[PATH_MAX]; |
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36 | 36 | char redirectsockname[PATH_MAX]; |
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37 | 37 | size_t argsize; |
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38 | 38 | const char **args; |
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39 | 39 | }; |
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40 | 40 | |
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41 | 41 | static void initcmdserveropts(struct cmdserveropts *opts) { |
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42 | 42 | memset(opts, 0, sizeof(struct cmdserveropts)); |
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43 | 43 | } |
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44 | 44 | |
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45 | 45 | static void freecmdserveropts(struct cmdserveropts *opts) { |
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46 | 46 | free(opts->args); |
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47 | 47 | opts->args = NULL; |
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48 | 48 | opts->argsize = 0; |
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49 | 49 | } |
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50 | 50 | |
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51 | 51 | /* |
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52 | 52 | * Test if an argument is a sensitive flag that should be passed to the server. |
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53 | 53 | * Return 0 if not, otherwise the number of arguments starting from the current |
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54 | 54 | * one that should be passed to the server. |
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55 | 55 | */ |
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56 | 56 | static size_t testsensitiveflag(const char *arg) |
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57 | 57 | { |
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58 | 58 | static const struct { |
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59 | 59 | const char *name; |
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60 | 60 | size_t narg; |
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61 | 61 | } flags[] = { |
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62 | 62 | {"--config", 1}, |
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63 | 63 | {"--cwd", 1}, |
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64 | 64 | {"--repo", 1}, |
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65 | 65 | {"--repository", 1}, |
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66 | 66 | {"--traceback", 0}, |
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67 | 67 | {"-R", 1}, |
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68 | 68 | }; |
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69 | 69 | size_t i; |
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70 | 70 | for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i) { |
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71 | 71 | size_t len = strlen(flags[i].name); |
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72 | 72 | size_t narg = flags[i].narg; |
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73 | 73 | if (memcmp(arg, flags[i].name, len) == 0) { |
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74 | 74 | if (arg[len] == '\0') { |
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75 | 75 | /* --flag (value) */ |
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76 | 76 | return narg + 1; |
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77 | 77 | } else if (arg[len] == '=' && narg > 0) { |
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78 | 78 | /* --flag=value */ |
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79 | 79 | return 1; |
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80 | 80 | } else if (flags[i].name[1] != '-') { |
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81 | 81 | /* short flag */ |
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82 | 82 | return 1; |
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83 | 83 | } |
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84 | 84 | } |
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85 | 85 | } |
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86 | 86 | return 0; |
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87 | 87 | } |
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88 | 88 | |
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89 | 89 | /* |
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90 | 90 | * Parse argv[] and put sensitive flags to opts->args |
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91 | 91 | */ |
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92 | 92 | static void setcmdserverargs(struct cmdserveropts *opts, |
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93 | 93 | int argc, const char *argv[]) |
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94 | 94 | { |
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95 | 95 | size_t i, step; |
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96 | 96 | opts->argsize = 0; |
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97 | 97 | for (i = 0, step = 1; i < (size_t)argc; i += step, step = 1) { |
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98 | 98 | if (!argv[i]) |
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99 | 99 | continue; /* pass clang-analyse */ |
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100 | 100 | if (strcmp(argv[i], "--") == 0) |
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101 | 101 | break; |
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102 | 102 | size_t n = testsensitiveflag(argv[i]); |
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103 | 103 | if (n == 0 || i + n > (size_t)argc) |
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104 | 104 | continue; |
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105 | 105 | opts->args = reallocx(opts->args, |
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106 | 106 | (n + opts->argsize) * sizeof(char *)); |
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107 | 107 | memcpy(opts->args + opts->argsize, argv + i, |
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108 | 108 | sizeof(char *) * n); |
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109 | 109 | opts->argsize += n; |
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110 | 110 | step = n; |
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111 | 111 | } |
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112 | 112 | } |
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113 | 113 | |
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114 | 114 | static void preparesockdir(const char *sockdir) |
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115 | 115 | { |
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116 | 116 | int r; |
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117 | 117 | r = mkdir(sockdir, 0700); |
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118 | 118 | if (r < 0 && errno != EEXIST) |
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119 | 119 | abortmsgerrno("cannot create sockdir %s", sockdir); |
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120 | 120 | |
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121 | 121 | struct stat st; |
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122 | 122 | r = lstat(sockdir, &st); |
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123 | 123 | if (r < 0) |
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124 | 124 | abortmsgerrno("cannot stat %s", sockdir); |
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125 | 125 | if (!S_ISDIR(st.st_mode)) |
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126 | 126 | abortmsg("cannot create sockdir %s (file exists)", sockdir); |
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127 | 127 | if (st.st_uid != geteuid() || st.st_mode & 0077) |
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128 | 128 | abortmsg("insecure sockdir %s", sockdir); |
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129 | 129 | } |
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130 | 130 | |
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131 | /* | |
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132 | * Check if a socket directory exists and is only owned by the current user. | |
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133 | * Return 1 if so, 0 if not. This is used to check if XDG_RUNTIME_DIR can be | |
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134 | * used or not. According to the specification [1], XDG_RUNTIME_DIR should be | |
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135 | * ignored if the directory is not owned by the user with mode 0700. | |
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136 | * [1]: https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html | |
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137 | */ | |
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138 | static int checkruntimedir(const char *sockdir) | |
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139 | { | |
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140 | struct stat st; | |
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141 | int r = lstat(sockdir, &st); | |
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142 | if (r < 0) /* ex. does not exist */ | |
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143 | return 0; | |
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144 | if (!S_ISDIR(st.st_mode)) /* ex. is a file, not a directory */ | |
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145 | return 0; | |
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146 | return st.st_uid == geteuid() && (st.st_mode & 0777) == 0700; | |
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147 | } | |
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148 | ||
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131 | 149 | static void getdefaultsockdir(char sockdir[], size_t size) |
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132 | 150 | { |
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133 | 151 | /* by default, put socket file in secure directory |
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134 | 152 | * (${XDG_RUNTIME_DIR}/chg, or /${TMPDIR:-tmp}/chg$UID) |
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135 | 153 | * (permission of socket file may be ignored on some Unices) */ |
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136 | 154 | const char *runtimedir = getenv("XDG_RUNTIME_DIR"); |
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137 | 155 | int r; |
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138 | if (runtimedir) { | |
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156 | if (runtimedir && checkruntimedir(runtimedir)) { | |
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139 | 157 | r = snprintf(sockdir, size, "%s/chg", runtimedir); |
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140 | 158 | } else { |
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141 | 159 | const char *tmpdir = getenv("TMPDIR"); |
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142 | 160 | if (!tmpdir) |
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143 | 161 | tmpdir = "/tmp"; |
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144 | 162 | r = snprintf(sockdir, size, "%s/chg%d", tmpdir, geteuid()); |
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145 | 163 | } |
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146 | 164 | if (r < 0 || (size_t)r >= size) |
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147 | 165 | abortmsg("too long TMPDIR (r = %d)", r); |
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148 | 166 | } |
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149 | 167 | |
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150 | 168 | static void setcmdserveropts(struct cmdserveropts *opts) |
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151 | 169 | { |
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152 | 170 | int r; |
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153 | 171 | char sockdir[PATH_MAX]; |
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154 | 172 | const char *envsockname = getenv("CHGSOCKNAME"); |
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155 | 173 | if (!envsockname) { |
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156 | 174 | getdefaultsockdir(sockdir, sizeof(sockdir)); |
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157 | 175 | preparesockdir(sockdir); |
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158 | 176 | } |
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159 | 177 | |
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160 | 178 | const char *basename = (envsockname) ? envsockname : sockdir; |
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161 | 179 | const char *sockfmt = (envsockname) ? "%s" : "%s/server"; |
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162 | 180 | r = snprintf(opts->sockname, sizeof(opts->sockname), sockfmt, basename); |
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163 | 181 | if (r < 0 || (size_t)r >= sizeof(opts->sockname)) |
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164 | 182 | abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); |
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165 | 183 | r = snprintf(opts->initsockname, sizeof(opts->initsockname), |
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166 | 184 | "%s.%u", opts->sockname, (unsigned)getpid()); |
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167 | 185 | if (r < 0 || (size_t)r >= sizeof(opts->initsockname)) |
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168 | 186 | abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); |
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169 | 187 | } |
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170 | 188 | |
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171 | 189 | static const char *gethgcmd(void) |
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172 | 190 | { |
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173 | 191 | static const char *hgcmd = NULL; |
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174 | 192 | if (!hgcmd) { |
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175 | 193 | hgcmd = getenv("CHGHG"); |
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176 | 194 | if (!hgcmd || hgcmd[0] == '\0') |
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177 | 195 | hgcmd = getenv("HG"); |
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178 | 196 | if (!hgcmd || hgcmd[0] == '\0') |
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179 | 197 | #ifdef HGPATH |
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180 | 198 | hgcmd = (HGPATH); |
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181 | 199 | #else |
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182 | 200 | hgcmd = "hg"; |
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183 | 201 | #endif |
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184 | 202 | } |
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185 | 203 | return hgcmd; |
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186 | 204 | } |
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187 | 205 | |
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188 | 206 | static void execcmdserver(const struct cmdserveropts *opts) |
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189 | 207 | { |
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190 | 208 | const char *hgcmd = gethgcmd(); |
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191 | 209 | |
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192 | 210 | const char *baseargv[] = { |
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193 | 211 | hgcmd, |
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194 | 212 | "serve", |
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195 | 213 | "--cmdserver", "chgunix", |
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196 | 214 | "--address", opts->initsockname, |
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197 | 215 | "--daemon-postexec", "chdir:/", |
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198 | 216 | }; |
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199 | 217 | size_t baseargvsize = sizeof(baseargv) / sizeof(baseargv[0]); |
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200 | 218 | size_t argsize = baseargvsize + opts->argsize + 1; |
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201 | 219 | |
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202 | 220 | const char **argv = mallocx(sizeof(char *) * argsize); |
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203 | 221 | memcpy(argv, baseargv, sizeof(baseargv)); |
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204 | 222 | memcpy(argv + baseargvsize, opts->args, sizeof(char *) * opts->argsize); |
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205 | 223 | argv[argsize - 1] = NULL; |
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206 | 224 | |
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207 | 225 | if (putenv("CHGINTERNALMARK=") != 0) |
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208 | 226 | abortmsgerrno("failed to putenv"); |
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209 | 227 | if (execvp(hgcmd, (char **)argv) < 0) |
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210 | 228 | abortmsgerrno("failed to exec cmdserver"); |
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211 | 229 | free(argv); |
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212 | 230 | } |
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213 | 231 | |
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214 | 232 | /* Retry until we can connect to the server. Give up after some time. */ |
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215 | 233 | static hgclient_t *retryconnectcmdserver(struct cmdserveropts *opts, pid_t pid) |
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216 | 234 | { |
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217 | 235 | static const struct timespec sleepreq = {0, 10 * 1000000}; |
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218 | 236 | int pst = 0; |
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219 | 237 | |
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220 | 238 | debugmsg("try connect to %s repeatedly", opts->initsockname); |
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221 | 239 | |
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222 | 240 | unsigned int timeoutsec = 60; /* default: 60 seconds */ |
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223 | 241 | const char *timeoutenv = getenv("CHGTIMEOUT"); |
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224 | 242 | if (timeoutenv) |
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225 | 243 | sscanf(timeoutenv, "%u", &timeoutsec); |
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226 | 244 | |
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227 | 245 | for (unsigned int i = 0; !timeoutsec || i < timeoutsec * 100; i++) { |
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228 | 246 | hgclient_t *hgc = hgc_open(opts->initsockname); |
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229 | 247 | if (hgc) { |
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230 | 248 | debugmsg("rename %s to %s", opts->initsockname, |
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231 | 249 | opts->sockname); |
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232 | 250 | int r = rename(opts->initsockname, opts->sockname); |
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233 | 251 | if (r != 0) |
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234 | 252 | abortmsgerrno("cannot rename"); |
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235 | 253 | return hgc; |
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236 | 254 | } |
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237 | 255 | |
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238 | 256 | if (pid > 0) { |
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239 | 257 | /* collect zombie if child process fails to start */ |
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240 | 258 | int r = waitpid(pid, &pst, WNOHANG); |
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241 | 259 | if (r != 0) |
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242 | 260 | goto cleanup; |
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243 | 261 | } |
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244 | 262 | |
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245 | 263 | nanosleep(&sleepreq, NULL); |
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246 | 264 | } |
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247 | 265 | |
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248 | 266 | abortmsg("timed out waiting for cmdserver %s", opts->initsockname); |
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249 | 267 | return NULL; |
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250 | 268 | |
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251 | 269 | cleanup: |
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252 | 270 | if (WIFEXITED(pst)) { |
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253 | 271 | if (WEXITSTATUS(pst) == 0) |
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254 | 272 | abortmsg("could not connect to cmdserver " |
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255 | 273 | "(exited with status 0)"); |
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256 | 274 | debugmsg("cmdserver exited with status %d", WEXITSTATUS(pst)); |
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257 | 275 | exit(WEXITSTATUS(pst)); |
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258 | 276 | } else if (WIFSIGNALED(pst)) { |
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259 | 277 | abortmsg("cmdserver killed by signal %d", WTERMSIG(pst)); |
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260 | 278 | } else { |
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261 | 279 | abortmsg("error while waiting for cmdserver"); |
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262 | 280 | } |
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263 | 281 | return NULL; |
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264 | 282 | } |
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265 | 283 | |
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266 | 284 | /* Connect to a cmdserver. Will start a new server on demand. */ |
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267 | 285 | static hgclient_t *connectcmdserver(struct cmdserveropts *opts) |
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268 | 286 | { |
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269 | 287 | const char *sockname = opts->redirectsockname[0] ? |
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270 | 288 | opts->redirectsockname : opts->sockname; |
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271 | 289 | debugmsg("try connect to %s", sockname); |
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272 | 290 | hgclient_t *hgc = hgc_open(sockname); |
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273 | 291 | if (hgc) |
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274 | 292 | return hgc; |
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275 | 293 | |
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276 | 294 | /* prevent us from being connected to an outdated server: we were |
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277 | 295 | * told by a server to redirect to opts->redirectsockname and that |
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278 | 296 | * address does not work. we do not want to connect to the server |
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279 | 297 | * again because it will probably tell us the same thing. */ |
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280 | 298 | if (sockname == opts->redirectsockname) |
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281 | 299 | unlink(opts->sockname); |
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282 | 300 | |
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283 | 301 | debugmsg("start cmdserver at %s", opts->initsockname); |
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284 | 302 | |
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285 | 303 | pid_t pid = fork(); |
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286 | 304 | if (pid < 0) |
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287 | 305 | abortmsg("failed to fork cmdserver process"); |
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288 | 306 | if (pid == 0) { |
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289 | 307 | execcmdserver(opts); |
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290 | 308 | } else { |
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291 | 309 | hgc = retryconnectcmdserver(opts, pid); |
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292 | 310 | } |
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293 | 311 | |
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294 | 312 | return hgc; |
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295 | 313 | } |
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296 | 314 | |
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297 | 315 | static void killcmdserver(const struct cmdserveropts *opts) |
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298 | 316 | { |
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299 | 317 | /* resolve config hash */ |
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300 | 318 | char *resolvedpath = realpath(opts->sockname, NULL); |
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301 | 319 | if (resolvedpath) { |
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302 | 320 | unlink(resolvedpath); |
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303 | 321 | free(resolvedpath); |
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304 | 322 | } |
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305 | 323 | } |
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306 | 324 | |
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307 | 325 | /* Run instructions sent from the server like unlink and set redirect path |
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308 | 326 | * Return 1 if reconnect is needed, otherwise 0 */ |
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309 | 327 | static int runinstructions(struct cmdserveropts *opts, const char **insts) |
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310 | 328 | { |
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311 | 329 | int needreconnect = 0; |
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312 | 330 | if (!insts) |
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313 | 331 | return needreconnect; |
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314 | 332 | |
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315 | 333 | assert(insts); |
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316 | 334 | opts->redirectsockname[0] = '\0'; |
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317 | 335 | const char **pinst; |
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318 | 336 | for (pinst = insts; *pinst; pinst++) { |
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319 | 337 | debugmsg("instruction: %s", *pinst); |
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320 | 338 | if (strncmp(*pinst, "unlink ", 7) == 0) { |
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321 | 339 | unlink(*pinst + 7); |
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322 | 340 | } else if (strncmp(*pinst, "redirect ", 9) == 0) { |
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323 | 341 | int r = snprintf(opts->redirectsockname, |
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324 | 342 | sizeof(opts->redirectsockname), |
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325 | 343 | "%s", *pinst + 9); |
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326 | 344 | if (r < 0 || r >= (int)sizeof(opts->redirectsockname)) |
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327 | 345 | abortmsg("redirect path is too long (%d)", r); |
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328 | 346 | needreconnect = 1; |
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329 | 347 | } else if (strncmp(*pinst, "exit ", 5) == 0) { |
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330 | 348 | int n = 0; |
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331 | 349 | if (sscanf(*pinst + 5, "%d", &n) != 1) |
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332 | 350 | abortmsg("cannot read the exit code"); |
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333 | 351 | exit(n); |
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334 | 352 | } else if (strcmp(*pinst, "reconnect") == 0) { |
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335 | 353 | needreconnect = 1; |
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336 | 354 | } else { |
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337 | 355 | abortmsg("unknown instruction: %s", *pinst); |
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338 | 356 | } |
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339 | 357 | } |
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340 | 358 | return needreconnect; |
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341 | 359 | } |
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342 | 360 | |
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343 | 361 | /* |
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344 | 362 | * Test whether the command is unsupported or not. This is not designed to |
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345 | 363 | * cover all cases. But it's fast, does not depend on the server and does |
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346 | 364 | * not return false positives. |
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347 | 365 | */ |
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348 | 366 | static int isunsupported(int argc, const char *argv[]) |
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349 | 367 | { |
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350 | 368 | enum { |
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351 | 369 | SERVE = 1, |
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352 | 370 | DAEMON = 2, |
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353 | 371 | SERVEDAEMON = SERVE | DAEMON, |
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354 | 372 | TIME = 4, |
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355 | 373 | }; |
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356 | 374 | unsigned int state = 0; |
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357 | 375 | int i; |
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358 | 376 | for (i = 0; i < argc; ++i) { |
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359 | 377 | if (strcmp(argv[i], "--") == 0) |
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360 | 378 | break; |
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361 | 379 | if (i == 0 && strcmp("serve", argv[i]) == 0) |
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362 | 380 | state |= SERVE; |
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363 | 381 | else if (strcmp("-d", argv[i]) == 0 || |
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364 | 382 | strcmp("--daemon", argv[i]) == 0) |
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365 | 383 | state |= DAEMON; |
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366 | 384 | else if (strcmp("--time", argv[i]) == 0) |
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367 | 385 | state |= TIME; |
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368 | 386 | } |
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369 | 387 | return (state & TIME) == TIME || |
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370 | 388 | (state & SERVEDAEMON) == SERVEDAEMON; |
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371 | 389 | } |
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372 | 390 | |
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373 | 391 | static void execoriginalhg(const char *argv[]) |
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374 | 392 | { |
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375 | 393 | debugmsg("execute original hg"); |
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376 | 394 | if (execvp(gethgcmd(), (char **)argv) < 0) |
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377 | 395 | abortmsgerrno("failed to exec original hg"); |
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378 | 396 | } |
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379 | 397 | |
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380 | 398 | int main(int argc, const char *argv[], const char *envp[]) |
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381 | 399 | { |
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382 | 400 | if (getenv("CHGDEBUG")) |
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383 | 401 | enabledebugmsg(); |
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384 | 402 | |
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385 | 403 | if (!getenv("HGPLAIN") && isatty(fileno(stderr))) |
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386 | 404 | enablecolor(); |
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387 | 405 | |
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388 | 406 | if (getenv("CHGINTERNALMARK")) |
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389 | 407 | abortmsg("chg started by chg detected.\n" |
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390 | 408 | "Please make sure ${HG:-hg} is not a symlink or " |
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391 | 409 | "wrapper to chg. Alternatively, set $CHGHG to the " |
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392 | 410 | "path of real hg."); |
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393 | 411 | |
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394 | 412 | if (isunsupported(argc - 1, argv + 1)) |
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395 | 413 | execoriginalhg(argv); |
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396 | 414 | |
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397 | 415 | struct cmdserveropts opts; |
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398 | 416 | initcmdserveropts(&opts); |
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399 | 417 | setcmdserveropts(&opts); |
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400 | 418 | setcmdserverargs(&opts, argc, argv); |
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401 | 419 | |
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402 | 420 | if (argc == 2) { |
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403 | 421 | if (strcmp(argv[1], "--kill-chg-daemon") == 0) { |
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404 | 422 | killcmdserver(&opts); |
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405 | 423 | return 0; |
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406 | 424 | } |
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407 | 425 | } |
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408 | 426 | |
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409 | 427 | hgclient_t *hgc; |
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410 | 428 | size_t retry = 0; |
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411 | 429 | while (1) { |
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412 | 430 | hgc = connectcmdserver(&opts); |
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413 | 431 | if (!hgc) |
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414 | 432 | abortmsg("cannot open hg client"); |
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415 | 433 | hgc_setenv(hgc, envp); |
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416 | 434 | const char **insts = hgc_validate(hgc, argv + 1, argc - 1); |
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417 | 435 | int needreconnect = runinstructions(&opts, insts); |
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418 | 436 | free(insts); |
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419 | 437 | if (!needreconnect) |
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420 | 438 | break; |
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421 | 439 | hgc_close(hgc); |
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422 | 440 | if (++retry > 10) |
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423 | 441 | abortmsg("too many redirections.\n" |
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424 | 442 | "Please make sure %s is not a wrapper which " |
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425 | 443 | "changes sensitive environment variables " |
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426 | 444 | "before executing hg. If you have to use a " |
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427 | 445 | "wrapper, wrap chg instead of hg.", |
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428 | 446 | gethgcmd()); |
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429 | 447 | } |
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430 | 448 | |
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431 | 449 | setupsignalhandler(hgc_peerpid(hgc), hgc_peerpgid(hgc)); |
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432 | 450 | int exitcode = hgc_runcommand(hgc, argv + 1, argc - 1); |
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433 | 451 | restoresignalhandler(); |
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434 | 452 | hgc_close(hgc); |
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435 | 453 | freecmdserveropts(&opts); |
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436 | 454 | waitpager(); |
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437 | 455 | |
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438 | 456 | return exitcode; |
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439 | 457 | } |
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