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@@ -1,571 +1,579 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 "util.h" |
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27 | 27 | |
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28 | 28 | #ifndef UNIX_PATH_MAX |
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29 | 29 | #define UNIX_PATH_MAX (sizeof(((struct sockaddr_un *)NULL)->sun_path)) |
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30 | 30 | #endif |
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31 | 31 | |
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32 | 32 | struct cmdserveropts { |
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33 | 33 | char sockname[UNIX_PATH_MAX]; |
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34 | 34 | char redirectsockname[UNIX_PATH_MAX]; |
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35 | 35 | char lockfile[UNIX_PATH_MAX]; |
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36 | 36 | char pidfile[UNIX_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 | int lockfd; |
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40 | 40 | }; |
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41 | 41 | |
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42 | 42 | static void initcmdserveropts(struct cmdserveropts *opts) { |
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43 | 43 | memset(opts, 0, sizeof(struct cmdserveropts)); |
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44 | 44 | opts->lockfd = -1; |
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45 | 45 | } |
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46 | 46 | |
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47 | 47 | static void freecmdserveropts(struct cmdserveropts *opts) { |
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48 | 48 | free(opts->args); |
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49 | 49 | opts->args = NULL; |
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50 | 50 | opts->argsize = 0; |
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51 | 51 | } |
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52 | 52 | |
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53 | 53 | /* |
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54 | 54 | * Test if an argument is a sensitive flag that should be passed to the server. |
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55 | 55 | * Return 0 if not, otherwise the number of arguments starting from the current |
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56 | 56 | * one that should be passed to the server. |
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57 | 57 | */ |
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58 | 58 | static size_t testsensitiveflag(const char *arg) |
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59 | 59 | { |
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60 | 60 | static const struct { |
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61 | 61 | const char *name; |
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62 | 62 | size_t narg; |
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63 | 63 | } flags[] = { |
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64 | 64 | {"--config", 1}, |
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65 | 65 | {"--cwd", 1}, |
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66 | 66 | {"--repo", 1}, |
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67 | 67 | {"--repository", 1}, |
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68 | 68 | {"--traceback", 0}, |
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69 | 69 | {"-R", 1}, |
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70 | 70 | }; |
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71 | 71 | size_t i; |
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72 | 72 | for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i) { |
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73 | 73 | size_t len = strlen(flags[i].name); |
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74 | 74 | size_t narg = flags[i].narg; |
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75 | 75 | if (memcmp(arg, flags[i].name, len) == 0) { |
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76 | 76 | if (arg[len] == '\0') { /* --flag (value) */ |
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77 | 77 | return narg + 1; |
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78 | 78 | } else if (arg[len] == '=' && narg > 0) { /* --flag=value */ |
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79 | 79 | return 1; |
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80 | 80 | } else if (flags[i].name[1] != '-') { /* short flag */ |
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81 | 81 | return 1; |
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82 | 82 | } |
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83 | 83 | } |
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84 | 84 | } |
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85 | 85 | return 0; |
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86 | 86 | } |
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87 | 87 | |
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88 | 88 | /* |
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89 | 89 | * Parse argv[] and put sensitive flags to opts->args |
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90 | 90 | */ |
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91 | 91 | static void setcmdserverargs(struct cmdserveropts *opts, |
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92 | 92 | int argc, const char *argv[]) |
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93 | 93 | { |
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94 | 94 | size_t i, step; |
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95 | 95 | opts->argsize = 0; |
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96 | 96 | for (i = 0, step = 1; i < (size_t)argc; i += step, step = 1) { |
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97 | 97 | if (!argv[i]) |
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98 | 98 | continue; /* pass clang-analyse */ |
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99 | 99 | if (strcmp(argv[i], "--") == 0) |
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100 | 100 | break; |
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101 | 101 | size_t n = testsensitiveflag(argv[i]); |
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102 | 102 | if (n == 0 || i + n > (size_t)argc) |
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103 | 103 | continue; |
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104 | 104 | opts->args = reallocx(opts->args, |
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105 | 105 | (n + opts->argsize) * sizeof(char *)); |
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106 | 106 | memcpy(opts->args + opts->argsize, argv + i, |
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107 | 107 | sizeof(char *) * n); |
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108 | 108 | opts->argsize += n; |
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109 | 109 | step = n; |
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110 | 110 | } |
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111 | 111 | } |
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112 | 112 | |
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113 | 113 | static void preparesockdir(const char *sockdir) |
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114 | 114 | { |
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115 | 115 | int r; |
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116 | 116 | r = mkdir(sockdir, 0700); |
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117 | 117 | if (r < 0 && errno != EEXIST) |
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118 | 118 | abortmsg("cannot create sockdir %s (errno = %d)", |
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119 | 119 | sockdir, errno); |
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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 | abortmsg("cannot stat %s (errno = %d)", sockdir, errno); |
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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 | 131 | static void setcmdserveropts(struct cmdserveropts *opts) |
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132 | 132 | { |
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133 | 133 | int r; |
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134 | 134 | char sockdir[UNIX_PATH_MAX]; |
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135 | 135 | const char *envsockname = getenv("CHGSOCKNAME"); |
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136 | 136 | if (!envsockname) { |
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137 | 137 | /* by default, put socket file in secure directory |
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138 | 138 | * (permission of socket file may be ignored on some Unices) */ |
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139 | 139 | const char *tmpdir = getenv("TMPDIR"); |
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140 | 140 | if (!tmpdir) |
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141 | 141 | tmpdir = "/tmp"; |
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142 | 142 | r = snprintf(sockdir, sizeof(sockdir), "%s/chg%d", |
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143 | 143 | tmpdir, geteuid()); |
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144 | 144 | if (r < 0 || (size_t)r >= sizeof(sockdir)) |
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145 | 145 | abortmsg("too long TMPDIR (r = %d)", r); |
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146 | 146 | preparesockdir(sockdir); |
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147 | 147 | } |
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148 | 148 | |
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149 | 149 | const char *basename = (envsockname) ? envsockname : sockdir; |
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150 | 150 | const char *sockfmt = (envsockname) ? "%s" : "%s/server"; |
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151 | 151 | const char *lockfmt = (envsockname) ? "%s.lock" : "%s/lock"; |
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152 | 152 | const char *pidfmt = (envsockname) ? "%s.pid" : "%s/pid"; |
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153 | 153 | r = snprintf(opts->sockname, sizeof(opts->sockname), sockfmt, basename); |
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154 | 154 | if (r < 0 || (size_t)r >= sizeof(opts->sockname)) |
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155 | 155 | abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); |
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156 | 156 | r = snprintf(opts->lockfile, sizeof(opts->lockfile), lockfmt, basename); |
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157 | 157 | if (r < 0 || (size_t)r >= sizeof(opts->lockfile)) |
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158 | 158 | abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); |
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159 | 159 | r = snprintf(opts->pidfile, sizeof(opts->pidfile), pidfmt, basename); |
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160 | 160 | if (r < 0 || (size_t)r >= sizeof(opts->pidfile)) |
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161 | 161 | abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); |
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162 | 162 | } |
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163 | 163 | |
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164 | 164 | /* |
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165 | 165 | * Acquire a file lock that indicates a client is trying to start and connect |
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166 | 166 | * to a server, before executing a command. The lock is released upon exit or |
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167 | 167 | * explicit unlock. Will block if the lock is held by another process. |
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168 | 168 | */ |
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169 | 169 | static void lockcmdserver(struct cmdserveropts *opts) |
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170 | 170 | { |
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171 | 171 | if (opts->lockfd == -1) { |
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172 | 172 | opts->lockfd = open(opts->lockfile, O_RDWR | O_CREAT | O_NOFOLLOW, 0600); |
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173 | 173 | if (opts->lockfd == -1) |
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174 | 174 | abortmsg("cannot create lock file %s", opts->lockfile); |
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175 | 175 | } |
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176 | 176 | int r = flock(opts->lockfd, LOCK_EX); |
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177 | 177 | if (r == -1) |
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178 | 178 | abortmsg("cannot acquire lock"); |
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179 | 179 | } |
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180 | 180 | |
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181 | 181 | /* |
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182 | 182 | * Release the file lock held by calling lockcmdserver. Will do nothing if |
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183 | 183 | * lockcmdserver is not called. |
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184 | 184 | */ |
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185 | 185 | static void unlockcmdserver(struct cmdserveropts *opts) |
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186 | 186 | { |
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187 | 187 | if (opts->lockfd == -1) |
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188 | 188 | return; |
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189 | 189 | flock(opts->lockfd, LOCK_UN); |
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190 | 190 | close(opts->lockfd); |
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191 | 191 | opts->lockfd = -1; |
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192 | 192 | } |
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193 | 193 | |
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194 | 194 | static const char *gethgcmd(void) |
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195 | 195 | { |
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196 | 196 | static const char *hgcmd = NULL; |
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197 | 197 | if (!hgcmd) { |
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198 | 198 | hgcmd = getenv("CHGHG"); |
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199 | 199 | if (!hgcmd || hgcmd[0] == '\0') |
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200 | 200 | hgcmd = getenv("HG"); |
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201 | 201 | if (!hgcmd || hgcmd[0] == '\0') |
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202 | 202 | hgcmd = "hg"; |
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203 | 203 | } |
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204 | 204 | return hgcmd; |
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205 | 205 | } |
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206 | 206 | |
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207 | 207 | static void execcmdserver(const struct cmdserveropts *opts) |
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208 | 208 | { |
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209 | 209 | const char *hgcmd = gethgcmd(); |
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210 | 210 | |
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211 | 211 | const char *baseargv[] = { |
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212 | 212 | hgcmd, |
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213 | 213 | "serve", |
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214 | 214 | "--cwd", "/", |
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215 | 215 | "--cmdserver", "chgunix", |
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216 | 216 | "--address", opts->sockname, |
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217 | 217 | "--daemon-postexec", "none", |
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218 | 218 | "--pid-file", opts->pidfile, |
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219 | 219 | "--config", "extensions.chgserver=", |
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220 | 220 | }; |
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221 | 221 | size_t baseargvsize = sizeof(baseargv) / sizeof(baseargv[0]); |
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222 | 222 | size_t argsize = baseargvsize + opts->argsize + 1; |
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223 | 223 | |
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224 | 224 | const char **argv = mallocx(sizeof(char *) * argsize); |
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225 | 225 | memcpy(argv, baseargv, sizeof(baseargv)); |
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226 | 226 | memcpy(argv + baseargvsize, opts->args, sizeof(char *) * opts->argsize); |
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227 | 227 | argv[argsize - 1] = NULL; |
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228 | 228 | |
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229 | 229 | if (putenv("CHGINTERNALMARK=") != 0) |
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230 | 230 | abortmsg("failed to putenv (errno = %d)", errno); |
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231 | 231 | if (execvp(hgcmd, (char **)argv) < 0) |
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232 | 232 | abortmsg("failed to exec cmdserver (errno = %d)", errno); |
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233 | 233 | free(argv); |
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234 | 234 | } |
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235 | 235 | |
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236 | 236 | /* Retry until we can connect to the server. Give up after some time. */ |
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237 | 237 | static hgclient_t *retryconnectcmdserver(struct cmdserveropts *opts, pid_t pid) |
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238 | 238 | { |
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239 | 239 | static const struct timespec sleepreq = {0, 10 * 1000000}; |
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240 | 240 | int pst = 0; |
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241 | 241 | |
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242 | 242 | for (unsigned int i = 0; i < 10 * 100; i++) { |
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243 | 243 | hgclient_t *hgc = hgc_open(opts->sockname); |
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244 | 244 | if (hgc) |
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245 | 245 | return hgc; |
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246 | 246 | |
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247 | 247 | if (pid > 0) { |
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248 | 248 | /* collect zombie if child process fails to start */ |
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249 | 249 | int r = waitpid(pid, &pst, WNOHANG); |
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250 | 250 | if (r != 0) |
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251 | 251 | goto cleanup; |
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252 | 252 | } |
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253 | 253 | |
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254 | 254 | nanosleep(&sleepreq, NULL); |
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255 | 255 | } |
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256 | 256 | |
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257 | 257 | abortmsg("timed out waiting for cmdserver %s", opts->sockname); |
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258 | 258 | return NULL; |
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259 | 259 | |
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260 | 260 | cleanup: |
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261 | 261 | if (WIFEXITED(pst)) { |
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262 | 262 | abortmsg("cmdserver exited with status %d", WEXITSTATUS(pst)); |
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263 | 263 | } else if (WIFSIGNALED(pst)) { |
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264 | 264 | abortmsg("cmdserver killed by signal %d", WTERMSIG(pst)); |
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265 | 265 | } else { |
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266 | 266 | abortmsg("error white waiting cmdserver"); |
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267 | 267 | } |
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268 | 268 | return NULL; |
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269 | 269 | } |
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270 | 270 | |
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271 | 271 | /* Connect to a cmdserver. Will start a new server on demand. */ |
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272 | 272 | static hgclient_t *connectcmdserver(struct cmdserveropts *opts) |
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273 | 273 | { |
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274 | 274 | const char *sockname = opts->redirectsockname[0] ? |
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275 | 275 | opts->redirectsockname : opts->sockname; |
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276 | 276 | hgclient_t *hgc = hgc_open(sockname); |
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277 | 277 | if (hgc) |
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278 | 278 | return hgc; |
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279 | 279 | |
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280 | 280 | lockcmdserver(opts); |
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281 | 281 | hgc = hgc_open(sockname); |
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282 | 282 | if (hgc) { |
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283 | 283 | unlockcmdserver(opts); |
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284 | 284 | debugmsg("cmdserver is started by another process"); |
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285 | 285 | return hgc; |
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286 | 286 | } |
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287 | 287 | |
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288 | 288 | /* prevent us from being connected to an outdated server: we were |
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289 | 289 | * told by a server to redirect to opts->redirectsockname and that |
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290 | 290 | * address does not work. we do not want to connect to the server |
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291 | 291 | * again because it will probably tell us the same thing. */ |
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292 | 292 | if (sockname == opts->redirectsockname) |
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293 | 293 | unlink(opts->sockname); |
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294 | 294 | |
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295 | 295 | debugmsg("start cmdserver at %s", opts->sockname); |
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296 | 296 | |
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297 | 297 | pid_t pid = fork(); |
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298 | 298 | if (pid < 0) |
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299 | 299 | abortmsg("failed to fork cmdserver process"); |
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300 | 300 | if (pid == 0) { |
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301 | 301 | /* do not leak lockfd to hg */ |
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302 | 302 | close(opts->lockfd); |
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303 | 303 | /* bypass uisetup() of pager extension */ |
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304 | 304 | int nullfd = open("/dev/null", O_WRONLY); |
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305 | 305 | if (nullfd >= 0) { |
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306 | 306 | dup2(nullfd, fileno(stdout)); |
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307 | 307 | close(nullfd); |
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308 | 308 | } |
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309 | 309 | execcmdserver(opts); |
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310 | 310 | } else { |
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311 | 311 | hgc = retryconnectcmdserver(opts, pid); |
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312 | 312 | } |
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313 | 313 | |
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314 | 314 | unlockcmdserver(opts); |
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315 | 315 | return hgc; |
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316 | 316 | } |
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317 | 317 | |
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318 | 318 | static void killcmdserver(const struct cmdserveropts *opts, int sig) |
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319 | 319 | { |
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320 | 320 | FILE *fp = fopen(opts->pidfile, "r"); |
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321 | 321 | if (!fp) |
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322 | 322 | abortmsg("cannot open %s (errno = %d)", opts->pidfile, errno); |
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323 | 323 | int pid = 0; |
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324 | 324 | int n = fscanf(fp, "%d", &pid); |
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325 | 325 | fclose(fp); |
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326 | 326 | if (n != 1 || pid <= 0) |
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327 | 327 | abortmsg("cannot read pid from %s", opts->pidfile); |
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328 | 328 | |
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329 | 329 | if (kill((pid_t)pid, sig) < 0) { |
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330 | 330 | if (errno == ESRCH) |
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331 | 331 | return; |
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332 | 332 | abortmsg("cannot kill %d (errno = %d)", pid, errno); |
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333 | 333 | } |
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334 | 334 | } |
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335 | 335 | |
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336 | 336 | static pid_t peerpid = 0; |
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337 | 337 | |
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338 | 338 | static void forwardsignal(int sig) |
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339 | 339 | { |
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340 | 340 | assert(peerpid > 0); |
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341 | 341 | if (kill(peerpid, sig) < 0) |
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342 | 342 | abortmsg("cannot kill %d (errno = %d)", peerpid, errno); |
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343 | 343 | debugmsg("forward signal %d", sig); |
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344 | 344 | } |
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345 | 345 | |
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346 | 346 | static void handlestopsignal(int sig) |
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347 | 347 | { |
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348 | 348 | sigset_t unblockset, oldset; |
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349 | 349 | struct sigaction sa, oldsa; |
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350 | 350 | if (sigemptyset(&unblockset) < 0) |
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351 | 351 | goto error; |
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352 | 352 | if (sigaddset(&unblockset, sig) < 0) |
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353 | 353 | goto error; |
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354 | 354 | memset(&sa, 0, sizeof(sa)); |
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355 | 355 | sa.sa_handler = SIG_DFL; |
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356 | 356 | sa.sa_flags = SA_RESTART; |
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357 | 357 | if (sigemptyset(&sa.sa_mask) < 0) |
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358 | 358 | goto error; |
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359 | 359 | |
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360 | 360 | forwardsignal(sig); |
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361 | 361 | if (raise(sig) < 0) /* resend to self */ |
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362 | 362 | goto error; |
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363 | 363 | if (sigaction(sig, &sa, &oldsa) < 0) |
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364 | 364 | goto error; |
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365 | 365 | if (sigprocmask(SIG_UNBLOCK, &unblockset, &oldset) < 0) |
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366 | 366 | goto error; |
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367 | 367 | /* resent signal will be handled before sigprocmask() returns */ |
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368 | 368 | if (sigprocmask(SIG_SETMASK, &oldset, NULL) < 0) |
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369 | 369 | goto error; |
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370 | 370 | if (sigaction(sig, &oldsa, NULL) < 0) |
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371 | 371 | goto error; |
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372 | 372 | return; |
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373 | 373 | |
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374 | 374 | error: |
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375 | 375 | abortmsg("failed to handle stop signal (errno = %d)", errno); |
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376 | 376 | } |
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377 | 377 | |
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378 | 378 | static void setupsignalhandler(pid_t pid) |
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379 | 379 | { |
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380 | 380 | if (pid <= 0) |
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381 | 381 | return; |
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382 | 382 | peerpid = pid; |
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383 | 383 | |
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384 | 384 | struct sigaction sa; |
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385 | 385 | memset(&sa, 0, sizeof(sa)); |
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386 | 386 | sa.sa_handler = forwardsignal; |
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387 | 387 | sa.sa_flags = SA_RESTART; |
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388 | 388 | if (sigemptyset(&sa.sa_mask) < 0) |
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389 | 389 | goto error; |
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390 | 390 | |
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391 | 391 | if (sigaction(SIGHUP, &sa, NULL) < 0) |
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392 | 392 | goto error; |
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393 | 393 | if (sigaction(SIGINT, &sa, NULL) < 0) |
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394 | 394 | goto error; |
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395 | 395 | |
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396 | 396 | /* terminate frontend by double SIGTERM in case of server freeze */ |
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397 | 397 | sa.sa_flags |= SA_RESETHAND; |
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398 | 398 | if (sigaction(SIGTERM, &sa, NULL) < 0) |
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399 | 399 | goto error; |
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400 | 400 | |
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401 | 401 | /* propagate job control requests to worker */ |
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402 | 402 | sa.sa_handler = forwardsignal; |
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403 | 403 | sa.sa_flags = SA_RESTART; |
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404 | 404 | if (sigaction(SIGCONT, &sa, NULL) < 0) |
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405 | 405 | goto error; |
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406 | 406 | sa.sa_handler = handlestopsignal; |
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407 | 407 | sa.sa_flags = SA_RESTART; |
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408 | 408 | if (sigaction(SIGTSTP, &sa, NULL) < 0) |
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409 | 409 | goto error; |
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410 | 410 | |
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411 | 411 | return; |
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412 | 412 | |
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413 | 413 | error: |
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414 | 414 | abortmsg("failed to set up signal handlers (errno = %d)", errno); |
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415 | 415 | } |
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416 | 416 | |
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417 | 417 | /* This implementation is based on hgext/pager.py (pre 369741ef7253) */ |
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418 | 418 | static void setuppager(hgclient_t *hgc, const char *const args[], |
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419 | 419 | size_t argsize) |
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420 | 420 | { |
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421 | 421 | const char *pagercmd = hgc_getpager(hgc, args, argsize); |
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422 | 422 | if (!pagercmd) |
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423 | 423 | return; |
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424 | 424 | |
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425 | 425 | int pipefds[2]; |
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426 | 426 | if (pipe(pipefds) < 0) |
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427 | 427 | return; |
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428 | 428 | pid_t pid = fork(); |
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429 | 429 | if (pid < 0) |
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430 | 430 | goto error; |
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431 | 431 | if (pid == 0) { |
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432 | 432 | close(pipefds[0]); |
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433 | 433 | if (dup2(pipefds[1], fileno(stdout)) < 0) |
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434 | 434 | goto error; |
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435 | 435 | if (isatty(fileno(stderr))) { |
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436 | 436 | if (dup2(pipefds[1], fileno(stderr)) < 0) |
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437 | 437 | goto error; |
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438 | 438 | } |
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439 | 439 | close(pipefds[1]); |
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440 | 440 | hgc_attachio(hgc); /* reattach to pager */ |
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441 | 441 | return; |
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442 | 442 | } else { |
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443 | 443 | dup2(pipefds[0], fileno(stdin)); |
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444 | 444 | close(pipefds[0]); |
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445 | 445 | close(pipefds[1]); |
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446 | 446 | |
|
447 | 447 | int r = execlp("/bin/sh", "/bin/sh", "-c", pagercmd, NULL); |
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448 | 448 | if (r < 0) { |
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449 | 449 | abortmsg("cannot start pager '%s' (errno = %d)", |
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450 | 450 | pagercmd, errno); |
|
451 | 451 | } |
|
452 | 452 | return; |
|
453 | 453 | } |
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454 | 454 | |
|
455 | 455 | error: |
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456 | 456 | close(pipefds[0]); |
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457 | 457 | close(pipefds[1]); |
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458 | 458 | abortmsg("failed to prepare pager (errno = %d)", errno); |
|
459 | 459 | } |
|
460 | 460 | |
|
461 | 461 | /* Run instructions sent from the server like unlink and set redirect path */ |
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462 | 462 | static void runinstructions(struct cmdserveropts *opts, const char **insts) |
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463 | 463 | { |
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464 | 464 | assert(insts); |
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465 | 465 | opts->redirectsockname[0] = '\0'; |
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466 | 466 | const char **pinst; |
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467 | 467 | for (pinst = insts; *pinst; pinst++) { |
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468 | 468 | debugmsg("instruction: %s", *pinst); |
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469 | 469 | if (strncmp(*pinst, "unlink ", 7) == 0) { |
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470 | 470 | unlink(*pinst + 7); |
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471 | 471 | } else if (strncmp(*pinst, "redirect ", 9) == 0) { |
|
472 | 472 | int r = snprintf(opts->redirectsockname, |
|
473 | 473 | sizeof(opts->redirectsockname), |
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474 | 474 | "%s", *pinst + 9); |
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475 | 475 | if (r < 0 || r >= (int)sizeof(opts->redirectsockname)) |
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476 | 476 | abortmsg("redirect path is too long (%d)", r); |
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477 | 477 | } else { |
|
478 | 478 | abortmsg("unknown instruction: %s", *pinst); |
|
479 | 479 | } |
|
480 | 480 | } |
|
481 | 481 | } |
|
482 | 482 | |
|
483 | 483 | /* |
|
484 | 484 | * Test whether the command is unsupported or not. This is not designed to |
|
485 | 485 | * cover all cases. But it's fast, does not depend on the server and does |
|
486 | 486 | * not return false positives. |
|
487 | 487 | */ |
|
488 | 488 | static int isunsupported(int argc, const char *argv[]) |
|
489 | 489 | { |
|
490 | 490 | enum { |
|
491 | 491 | SERVE = 1, |
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492 | 492 | DAEMON = 2, |
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493 | 493 | SERVEDAEMON = SERVE | DAEMON, |
|
494 | 494 | TIME = 4, |
|
495 | 495 | }; |
|
496 | 496 | unsigned int state = 0; |
|
497 | 497 | int i; |
|
498 | 498 | for (i = 0; i < argc; ++i) { |
|
499 | 499 | if (strcmp(argv[i], "--") == 0) |
|
500 | 500 | break; |
|
501 | 501 | if (i == 0 && strcmp("serve", argv[i]) == 0) |
|
502 | 502 | state |= SERVE; |
|
503 | 503 | else if (strcmp("-d", argv[i]) == 0 || |
|
504 | 504 | strcmp("--daemon", argv[i]) == 0) |
|
505 | 505 | state |= DAEMON; |
|
506 | 506 | else if (strcmp("--time", argv[i]) == 0) |
|
507 | 507 | state |= TIME; |
|
508 | 508 | } |
|
509 | 509 | return (state & TIME) == TIME || |
|
510 | 510 | (state & SERVEDAEMON) == SERVEDAEMON; |
|
511 | 511 | } |
|
512 | 512 | |
|
513 | 513 | static void execoriginalhg(const char *argv[]) |
|
514 | 514 | { |
|
515 | 515 | debugmsg("execute original hg"); |
|
516 | 516 | if (execvp(gethgcmd(), (char **)argv) < 0) |
|
517 | 517 | abortmsg("failed to exec original hg (errno = %d)", errno); |
|
518 | 518 | } |
|
519 | 519 | |
|
520 | 520 | int main(int argc, const char *argv[], const char *envp[]) |
|
521 | 521 | { |
|
522 | 522 | if (getenv("CHGDEBUG")) |
|
523 | 523 | enabledebugmsg(); |
|
524 | 524 | |
|
525 | 525 | if (getenv("CHGINTERNALMARK")) |
|
526 | 526 | abortmsg("chg started by chg detected.\n" |
|
527 | 527 | "Please make sure ${HG:-hg} is not a symlink or " |
|
528 | 528 | "wrapper to chg. Alternatively, set $CHGHG to the " |
|
529 | 529 | "path of real hg."); |
|
530 | 530 | |
|
531 | 531 | if (isunsupported(argc - 1, argv + 1)) |
|
532 | 532 | execoriginalhg(argv); |
|
533 | 533 | |
|
534 | 534 | struct cmdserveropts opts; |
|
535 | 535 | initcmdserveropts(&opts); |
|
536 | 536 | setcmdserveropts(&opts); |
|
537 | 537 | setcmdserverargs(&opts, argc, argv); |
|
538 | 538 | |
|
539 | 539 | if (argc == 2) { |
|
540 | 540 | int sig = 0; |
|
541 | 541 | if (strcmp(argv[1], "--kill-chg-daemon") == 0) |
|
542 | 542 | sig = SIGTERM; |
|
543 | 543 | if (strcmp(argv[1], "--reload-chg-daemon") == 0) |
|
544 | 544 | sig = SIGHUP; |
|
545 | 545 | if (sig > 0) { |
|
546 | 546 | killcmdserver(&opts, sig); |
|
547 | 547 | return 0; |
|
548 | 548 | } |
|
549 | 549 | } |
|
550 | 550 | |
|
551 | 551 | hgclient_t *hgc; |
|
552 | size_t retry = 0; | |
|
552 | 553 | while (1) { |
|
553 | 554 | hgc = connectcmdserver(&opts); |
|
554 | 555 | if (!hgc) |
|
555 | 556 | abortmsg("cannot open hg client"); |
|
556 | 557 | hgc_setenv(hgc, envp); |
|
557 | 558 | const char **insts = hgc_validate(hgc, argv + 1, argc - 1); |
|
558 | 559 | if (insts == NULL) |
|
559 | 560 | break; |
|
560 | 561 | runinstructions(&opts, insts); |
|
561 | 562 | free(insts); |
|
562 | 563 | hgc_close(hgc); |
|
564 | if (++retry > 10) | |
|
565 | abortmsg("too many redirections.\n" | |
|
566 | "Please make sure %s is not a wrapper which " | |
|
567 | "changes sensitive environment variables " | |
|
568 | "before executing hg. If you have to use a " | |
|
569 | "wrapper, wrap chg instead of hg.", | |
|
570 | gethgcmd()); | |
|
563 | 571 | } |
|
564 | 572 | |
|
565 | 573 | setupsignalhandler(hgc_peerpid(hgc)); |
|
566 | 574 | setuppager(hgc, argv + 1, argc - 1); |
|
567 | 575 | int exitcode = hgc_runcommand(hgc, argv + 1, argc - 1); |
|
568 | 576 | hgc_close(hgc); |
|
569 | 577 | freecmdserveropts(&opts); |
|
570 | 578 | return exitcode; |
|
571 | 579 | } |
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