Mercurial > hg
annotate contrib/chg/chg.c @ 28852:7b5f5a1b4b41
chg: add sockdirfd to cmdserveropts
As part of the series to support long socket paths, we need to add the fd of
the directory to the cmdserveropts structure so we can use basenames instead
of full paths for sockname, redirectsockname, and lockfile.
author | Jun Wu <quark@fb.com> |
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date | Sun, 10 Apr 2016 23:56:00 +0100 |
parents | 584e0716c7af |
children | d11548b4ae45 |
rev | line source |
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28060 | 1 /* |
2 * A fast client for Mercurial command server | |
3 * | |
4 * Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org> | |
5 * | |
6 * This software may be used and distributed according to the terms of the | |
7 * GNU General Public License version 2 or any later version. | |
8 */ | |
9 | |
10 #include <assert.h> | |
11 #include <errno.h> | |
12 #include <fcntl.h> | |
13 #include <signal.h> | |
14 #include <stdio.h> | |
15 #include <stdlib.h> | |
16 #include <string.h> | |
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17 #include <sys/file.h> |
28060 | 18 #include <sys/stat.h> |
19 #include <sys/types.h> | |
20 #include <sys/un.h> | |
21 #include <sys/wait.h> | |
22 #include <time.h> | |
23 #include <unistd.h> | |
24 | |
25 #include "hgclient.h" | |
26 #include "util.h" | |
27 | |
28 #ifndef UNIX_PATH_MAX | |
29 #define UNIX_PATH_MAX (sizeof(((struct sockaddr_un *)NULL)->sun_path)) | |
30 #endif | |
31 | |
32 struct cmdserveropts { | |
33 char sockname[UNIX_PATH_MAX]; | |
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34 char redirectsockname[UNIX_PATH_MAX]; |
28060 | 35 char lockfile[UNIX_PATH_MAX]; |
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36 size_t argsize; |
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37 const char **args; |
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38 int lockfd; |
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39 int sockdirfd; |
28060 | 40 }; |
41 | |
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42 static void initcmdserveropts(struct cmdserveropts *opts) { |
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43 memset(opts, 0, sizeof(struct cmdserveropts)); |
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44 opts->lockfd = -1; |
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45 opts->sockdirfd = AT_FDCWD; |
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46 } |
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47 |
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48 static void freecmdserveropts(struct cmdserveropts *opts) { |
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49 free(opts->args); |
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50 opts->args = NULL; |
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51 opts->argsize = 0; |
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52 if (opts->sockdirfd != AT_FDCWD) { |
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53 close(opts->sockdirfd); |
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54 opts->sockdirfd = AT_FDCWD; |
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55 } |
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56 } |
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57 |
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58 /* |
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59 * Test if an argument is a sensitive flag that should be passed to the server. |
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60 * Return 0 if not, otherwise the number of arguments starting from the current |
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61 * one that should be passed to the server. |
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62 */ |
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63 static size_t testsensitiveflag(const char *arg) |
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64 { |
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65 static const struct { |
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66 const char *name; |
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67 size_t narg; |
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68 } flags[] = { |
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69 {"--config", 1}, |
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70 {"--cwd", 1}, |
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71 {"--repo", 1}, |
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72 {"--repository", 1}, |
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73 {"--traceback", 0}, |
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74 {"-R", 1}, |
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75 }; |
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76 size_t i; |
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77 for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i) { |
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78 size_t len = strlen(flags[i].name); |
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79 size_t narg = flags[i].narg; |
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80 if (memcmp(arg, flags[i].name, len) == 0) { |
28790 | 81 if (arg[len] == '\0') { |
82 /* --flag (value) */ | |
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83 return narg + 1; |
28790 | 84 } else if (arg[len] == '=' && narg > 0) { |
85 /* --flag=value */ | |
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86 return 1; |
28790 | 87 } else if (flags[i].name[1] != '-') { |
88 /* short flag */ | |
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89 return 1; |
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90 } |
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91 } |
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92 } |
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93 return 0; |
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94 } |
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95 |
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96 /* |
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97 * Parse argv[] and put sensitive flags to opts->args |
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98 */ |
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99 static void setcmdserverargs(struct cmdserveropts *opts, |
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100 int argc, const char *argv[]) |
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101 { |
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102 size_t i, step; |
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103 opts->argsize = 0; |
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104 for (i = 0, step = 1; i < (size_t)argc; i += step, step = 1) { |
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105 if (!argv[i]) |
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106 continue; /* pass clang-analyse */ |
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107 if (strcmp(argv[i], "--") == 0) |
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108 break; |
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109 size_t n = testsensitiveflag(argv[i]); |
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110 if (n == 0 || i + n > (size_t)argc) |
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111 continue; |
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112 opts->args = reallocx(opts->args, |
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113 (n + opts->argsize) * sizeof(char *)); |
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114 memcpy(opts->args + opts->argsize, argv + i, |
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115 sizeof(char *) * n); |
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116 opts->argsize += n; |
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117 step = n; |
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118 } |
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119 } |
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120 |
28060 | 121 static void preparesockdir(const char *sockdir) |
122 { | |
123 int r; | |
124 r = mkdir(sockdir, 0700); | |
125 if (r < 0 && errno != EEXIST) | |
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126 abortmsgerrno("cannot create sockdir %s", sockdir); |
28060 | 127 |
128 struct stat st; | |
129 r = lstat(sockdir, &st); | |
130 if (r < 0) | |
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131 abortmsgerrno("cannot stat %s", sockdir); |
28060 | 132 if (!S_ISDIR(st.st_mode)) |
133 abortmsg("cannot create sockdir %s (file exists)", sockdir); | |
134 if (st.st_uid != geteuid() || st.st_mode & 0077) | |
135 abortmsg("insecure sockdir %s", sockdir); | |
136 } | |
137 | |
138 static void setcmdserveropts(struct cmdserveropts *opts) | |
139 { | |
140 int r; | |
141 char sockdir[UNIX_PATH_MAX]; | |
142 const char *envsockname = getenv("CHGSOCKNAME"); | |
143 if (!envsockname) { | |
144 /* by default, put socket file in secure directory | |
145 * (permission of socket file may be ignored on some Unices) */ | |
146 const char *tmpdir = getenv("TMPDIR"); | |
147 if (!tmpdir) | |
148 tmpdir = "/tmp"; | |
149 r = snprintf(sockdir, sizeof(sockdir), "%s/chg%d", | |
150 tmpdir, geteuid()); | |
151 if (r < 0 || (size_t)r >= sizeof(sockdir)) | |
152 abortmsg("too long TMPDIR (r = %d)", r); | |
153 preparesockdir(sockdir); | |
154 } | |
155 | |
156 const char *basename = (envsockname) ? envsockname : sockdir; | |
157 const char *sockfmt = (envsockname) ? "%s" : "%s/server"; | |
158 const char *lockfmt = (envsockname) ? "%s.lock" : "%s/lock"; | |
159 r = snprintf(opts->sockname, sizeof(opts->sockname), sockfmt, basename); | |
160 if (r < 0 || (size_t)r >= sizeof(opts->sockname)) | |
161 abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); | |
162 r = snprintf(opts->lockfile, sizeof(opts->lockfile), lockfmt, basename); | |
163 if (r < 0 || (size_t)r >= sizeof(opts->lockfile)) | |
164 abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); | |
165 } | |
166 | |
167 /* | |
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168 * Acquire a file lock that indicates a client is trying to start and connect |
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169 * to a server, before executing a command. The lock is released upon exit or |
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170 * explicit unlock. Will block if the lock is held by another process. |
28060 | 171 */ |
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172 static void lockcmdserver(struct cmdserveropts *opts) |
28060 | 173 { |
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174 if (opts->lockfd == -1) { |
28790 | 175 opts->lockfd = open(opts->lockfile, |
176 O_RDWR | O_CREAT | O_NOFOLLOW, 0600); | |
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177 if (opts->lockfd == -1) |
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178 abortmsgerrno("cannot create lock file %s", |
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179 opts->lockfile); |
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180 } |
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181 int r = flock(opts->lockfd, LOCK_EX); |
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182 if (r == -1) |
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183 abortmsgerrno("cannot acquire lock"); |
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184 } |
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185 |
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186 /* |
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187 * Release the file lock held by calling lockcmdserver. Will do nothing if |
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188 * lockcmdserver is not called. |
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189 */ |
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190 static void unlockcmdserver(struct cmdserveropts *opts) |
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191 { |
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192 if (opts->lockfd == -1) |
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193 return; |
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194 flock(opts->lockfd, LOCK_UN); |
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195 close(opts->lockfd); |
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196 opts->lockfd = -1; |
28060 | 197 } |
198 | |
28237
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199 static const char *gethgcmd(void) |
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200 { |
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201 static const char *hgcmd = NULL; |
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202 if (!hgcmd) { |
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|
203 hgcmd = getenv("CHGHG"); |
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204 if (!hgcmd || hgcmd[0] == '\0') |
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205 hgcmd = getenv("HG"); |
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206 if (!hgcmd || hgcmd[0] == '\0') |
28605
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diff
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|
207 #ifdef HGPATH |
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|
208 hgcmd = (HGPATH); |
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diff
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|
209 #else |
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210 hgcmd = "hg"; |
28605
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|
211 #endif |
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212 } |
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213 return hgcmd; |
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|
214 } |
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|
215 |
28060 | 216 static void execcmdserver(const struct cmdserveropts *opts) |
217 { | |
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218 const char *hgcmd = gethgcmd(); |
28060 | 219 |
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Jun Wu <quark@fb.com>
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diff
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|
220 const char *baseargv[] = { |
28060 | 221 hgcmd, |
222 "serve", | |
223 "--cmdserver", "chgunix", | |
224 "--address", opts->sockname, | |
28453
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diff
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|
225 "--daemon-postexec", "chdir:/", |
28060 | 226 "--config", "extensions.chgserver=", |
227 }; | |
28167
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228 size_t baseargvsize = sizeof(baseargv) / sizeof(baseargv[0]); |
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229 size_t argsize = baseargvsize + opts->argsize + 1; |
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230 |
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|
231 const char **argv = mallocx(sizeof(char *) * argsize); |
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232 memcpy(argv, baseargv, sizeof(baseargv)); |
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233 memcpy(argv + baseargvsize, opts->args, sizeof(char *) * opts->argsize); |
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|
234 argv[argsize - 1] = NULL; |
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diff
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|
235 |
28261 | 236 if (putenv("CHGINTERNALMARK=") != 0) |
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|
237 abortmsgerrno("failed to putenv"); |
28060 | 238 if (execvp(hgcmd, (char **)argv) < 0) |
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diff
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|
239 abortmsgerrno("failed to exec cmdserver"); |
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diff
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240 free(argv); |
28060 | 241 } |
242 | |
28196
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243 /* Retry until we can connect to the server. Give up after some time. */ |
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244 static hgclient_t *retryconnectcmdserver(struct cmdserveropts *opts, pid_t pid) |
28060 | 245 { |
246 static const struct timespec sleepreq = {0, 10 * 1000000}; | |
247 int pst = 0; | |
248 | |
28769
222f482930c8
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249 debugmsg("try connect to %s repeatedly", opts->sockname); |
28060 | 250 for (unsigned int i = 0; i < 10 * 100; i++) { |
28196
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|
251 hgclient_t *hgc = hgc_open(opts->sockname); |
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|
252 if (hgc) |
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|
253 return hgc; |
28060 | 254 |
255 if (pid > 0) { | |
256 /* collect zombie if child process fails to start */ | |
28196
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Jun Wu <quark@fb.com>
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|
257 int r = waitpid(pid, &pst, WNOHANG); |
28060 | 258 if (r != 0) |
259 goto cleanup; | |
260 } | |
261 | |
262 nanosleep(&sleepreq, NULL); | |
263 } | |
264 | |
28196
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diff
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|
265 abortmsg("timed out waiting for cmdserver %s", opts->sockname); |
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|
266 return NULL; |
28060 | 267 |
268 cleanup: | |
269 if (WIFEXITED(pst)) { | |
28477
194a6cd873cd
chg: silently inherit server exit code
Jun Wu <quark@fb.com>
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28455
diff
changeset
|
270 debugmsg("cmdserver exited with status %d", WEXITSTATUS(pst)); |
194a6cd873cd
chg: silently inherit server exit code
Jun Wu <quark@fb.com>
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|
271 exit(WEXITSTATUS(pst)); |
28060 | 272 } else if (WIFSIGNALED(pst)) { |
273 abortmsg("cmdserver killed by signal %d", WTERMSIG(pst)); | |
274 } else { | |
28851
584e0716c7af
chg: fix spelling in the error message about error waiting for cmdserver
Jun Wu <quark@fb.com>
parents:
28790
diff
changeset
|
275 abortmsg("error while waiting for cmdserver"); |
28060 | 276 } |
28196
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chg: hold a lock file before connected to server
Jun Wu <quark@fb.com>
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|
277 return NULL; |
28060 | 278 } |
279 | |
28196
87de4a22e8c2
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280 /* Connect to a cmdserver. Will start a new server on demand. */ |
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|
281 static hgclient_t *connectcmdserver(struct cmdserveropts *opts) |
28060 | 282 { |
28357
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Jun Wu <quark@fb.com>
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28327
diff
changeset
|
283 const char *sockname = opts->redirectsockname[0] ? |
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chg: use validate to make sure the server is up to date
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28327
diff
changeset
|
284 opts->redirectsockname : opts->sockname; |
28769
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Jun Wu <quark@fb.com>
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|
285 debugmsg("try connect to %s", sockname); |
28357
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chg: use validate to make sure the server is up to date
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28327
diff
changeset
|
286 hgclient_t *hgc = hgc_open(sockname); |
28196
87de4a22e8c2
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Jun Wu <quark@fb.com>
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diff
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|
287 if (hgc) |
87de4a22e8c2
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|
288 return hgc; |
28060 | 289 |
28196
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chg: hold a lock file before connected to server
Jun Wu <quark@fb.com>
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diff
changeset
|
290 lockcmdserver(opts); |
28357
2f0f352d4196
chg: use validate to make sure the server is up to date
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parents:
28327
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|
291 hgc = hgc_open(sockname); |
28196
87de4a22e8c2
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diff
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|
292 if (hgc) { |
87de4a22e8c2
chg: hold a lock file before connected to server
Jun Wu <quark@fb.com>
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diff
changeset
|
293 unlockcmdserver(opts); |
87de4a22e8c2
chg: hold a lock file before connected to server
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diff
changeset
|
294 debugmsg("cmdserver is started by another process"); |
87de4a22e8c2
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Jun Wu <quark@fb.com>
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diff
changeset
|
295 return hgc; |
28060 | 296 } |
297 | |
28357
2f0f352d4196
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28327
diff
changeset
|
298 /* prevent us from being connected to an outdated server: we were |
2f0f352d4196
chg: use validate to make sure the server is up to date
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diff
changeset
|
299 * told by a server to redirect to opts->redirectsockname and that |
2f0f352d4196
chg: use validate to make sure the server is up to date
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diff
changeset
|
300 * address does not work. we do not want to connect to the server |
2f0f352d4196
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Jun Wu <quark@fb.com>
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301 * again because it will probably tell us the same thing. */ |
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diff
changeset
|
302 if (sockname == opts->redirectsockname) |
2f0f352d4196
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Jun Wu <quark@fb.com>
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diff
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|
303 unlink(opts->sockname); |
2f0f352d4196
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Jun Wu <quark@fb.com>
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diff
changeset
|
304 |
28196
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diff
changeset
|
305 debugmsg("start cmdserver at %s", opts->sockname); |
28060 | 306 |
307 pid_t pid = fork(); | |
308 if (pid < 0) | |
309 abortmsg("failed to fork cmdserver process"); | |
310 if (pid == 0) { | |
28196
87de4a22e8c2
chg: hold a lock file before connected to server
Jun Wu <quark@fb.com>
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diff
changeset
|
311 /* do not leak lockfd to hg */ |
87de4a22e8c2
chg: hold a lock file before connected to server
Jun Wu <quark@fb.com>
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diff
changeset
|
312 close(opts->lockfd); |
28060 | 313 execcmdserver(opts); |
314 } else { | |
28196
87de4a22e8c2
chg: hold a lock file before connected to server
Jun Wu <quark@fb.com>
parents:
28194
diff
changeset
|
315 hgc = retryconnectcmdserver(opts, pid); |
28060 | 316 } |
28196
87de4a22e8c2
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Jun Wu <quark@fb.com>
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diff
changeset
|
317 |
87de4a22e8c2
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parents:
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diff
changeset
|
318 unlockcmdserver(opts); |
87de4a22e8c2
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Jun Wu <quark@fb.com>
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diff
changeset
|
319 return hgc; |
28060 | 320 } |
321 | |
28455 | 322 static void killcmdserver(const struct cmdserveropts *opts) |
28060 | 323 { |
28455 | 324 /* resolve config hash */ |
325 char *resolvedpath = realpath(opts->sockname, NULL); | |
326 if (resolvedpath) { | |
327 unlink(resolvedpath); | |
328 free(resolvedpath); | |
28060 | 329 } |
330 } | |
331 | |
332 static pid_t peerpid = 0; | |
333 | |
334 static void forwardsignal(int sig) | |
335 { | |
336 assert(peerpid > 0); | |
337 if (kill(peerpid, sig) < 0) | |
28789
7f6e0a15189b
chg: replace abortmsg showing errno with abortmsgerrno
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diff
changeset
|
338 abortmsgerrno("cannot kill %d", peerpid); |
28060 | 339 debugmsg("forward signal %d", sig); |
340 } | |
341 | |
28086
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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diff
changeset
|
342 static void handlestopsignal(int sig) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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diff
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|
343 { |
65d24ca35496
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diff
changeset
|
344 sigset_t unblockset, oldset; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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parents:
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diff
changeset
|
345 struct sigaction sa, oldsa; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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diff
changeset
|
346 if (sigemptyset(&unblockset) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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diff
changeset
|
347 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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parents:
28085
diff
changeset
|
348 if (sigaddset(&unblockset, sig) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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28085
diff
changeset
|
349 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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parents:
28085
diff
changeset
|
350 memset(&sa, 0, sizeof(sa)); |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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diff
changeset
|
351 sa.sa_handler = SIG_DFL; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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28085
diff
changeset
|
352 sa.sa_flags = SA_RESTART; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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diff
changeset
|
353 if (sigemptyset(&sa.sa_mask) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
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parents:
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diff
changeset
|
354 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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28085
diff
changeset
|
355 |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
356 forwardsignal(sig); |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
357 if (raise(sig) < 0) /* resend to self */ |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
358 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
359 if (sigaction(sig, &sa, &oldsa) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
changeset
|
360 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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28085
diff
changeset
|
361 if (sigprocmask(SIG_UNBLOCK, &unblockset, &oldset) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
362 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
363 /* resent signal will be handled before sigprocmask() returns */ |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
364 if (sigprocmask(SIG_SETMASK, &oldset, NULL) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
365 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
366 if (sigaction(sig, &oldsa, NULL) < 0) |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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28085
diff
changeset
|
367 goto error; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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diff
changeset
|
368 return; |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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28085
diff
changeset
|
369 |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
370 error: |
28789
7f6e0a15189b
chg: replace abortmsg showing errno with abortmsgerrno
Jun Wu <quark@fb.com>
parents:
28787
diff
changeset
|
371 abortmsgerrno("failed to handle stop signal"); |
28086
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
parents:
28085
diff
changeset
|
372 } |
65d24ca35496
chg: forward job control signals to worker process (issue5051)
Yuya Nishihara <yuya@tcha.org>
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|
373 |
28060 | 374 static void setupsignalhandler(pid_t pid) |
375 { | |
376 if (pid <= 0) | |
377 return; | |
378 peerpid = pid; | |
379 | |
380 struct sigaction sa; | |
381 memset(&sa, 0, sizeof(sa)); | |
382 sa.sa_handler = forwardsignal; | |
383 sa.sa_flags = SA_RESTART; | |
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384 if (sigemptyset(&sa.sa_mask) < 0) |
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385 goto error; |
28060 | 386 |
28085
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387 if (sigaction(SIGHUP, &sa, NULL) < 0) |
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388 goto error; |
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389 if (sigaction(SIGINT, &sa, NULL) < 0) |
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390 goto error; |
28060 | 391 |
392 /* terminate frontend by double SIGTERM in case of server freeze */ | |
393 sa.sa_flags |= SA_RESETHAND; | |
28085
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394 if (sigaction(SIGTERM, &sa, NULL) < 0) |
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395 goto error; |
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|
396 |
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|
397 /* propagate job control requests to worker */ |
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398 sa.sa_handler = forwardsignal; |
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399 sa.sa_flags = SA_RESTART; |
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400 if (sigaction(SIGCONT, &sa, NULL) < 0) |
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401 goto error; |
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402 sa.sa_handler = handlestopsignal; |
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403 sa.sa_flags = SA_RESTART; |
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|
404 if (sigaction(SIGTSTP, &sa, NULL) < 0) |
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405 goto error; |
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|
406 |
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407 return; |
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408 |
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409 error: |
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410 abortmsgerrno("failed to set up signal handlers"); |
28060 | 411 } |
412 | |
413 /* This implementation is based on hgext/pager.py (pre 369741ef7253) */ | |
414 static void setuppager(hgclient_t *hgc, const char *const args[], | |
415 size_t argsize) | |
416 { | |
417 const char *pagercmd = hgc_getpager(hgc, args, argsize); | |
418 if (!pagercmd) | |
419 return; | |
420 | |
421 int pipefds[2]; | |
422 if (pipe(pipefds) < 0) | |
423 return; | |
424 pid_t pid = fork(); | |
425 if (pid < 0) | |
426 goto error; | |
427 if (pid == 0) { | |
428 close(pipefds[0]); | |
429 if (dup2(pipefds[1], fileno(stdout)) < 0) | |
430 goto error; | |
431 if (isatty(fileno(stderr))) { | |
432 if (dup2(pipefds[1], fileno(stderr)) < 0) | |
433 goto error; | |
434 } | |
435 close(pipefds[1]); | |
436 hgc_attachio(hgc); /* reattach to pager */ | |
437 return; | |
438 } else { | |
439 dup2(pipefds[0], fileno(stdin)); | |
440 close(pipefds[0]); | |
441 close(pipefds[1]); | |
442 | |
443 int r = execlp("/bin/sh", "/bin/sh", "-c", pagercmd, NULL); | |
444 if (r < 0) { | |
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445 abortmsgerrno("cannot start pager '%s'", pagercmd); |
28060 | 446 } |
447 return; | |
448 } | |
449 | |
450 error: | |
451 close(pipefds[0]); | |
452 close(pipefds[1]); | |
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453 abortmsgerrno("failed to prepare pager"); |
28060 | 454 } |
455 | |
28535
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456 /* Run instructions sent from the server like unlink and set redirect path |
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457 * Return 1 if reconnect is needed, otherwise 0 */ |
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458 static int runinstructions(struct cmdserveropts *opts, const char **insts) |
28357
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|
459 { |
28535
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|
460 int needreconnect = 0; |
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|
461 if (!insts) |
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462 return needreconnect; |
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|
463 |
28357
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|
464 assert(insts); |
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|
465 opts->redirectsockname[0] = '\0'; |
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|
466 const char **pinst; |
2f0f352d4196
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|
467 for (pinst = insts; *pinst; pinst++) { |
2f0f352d4196
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|
468 debugmsg("instruction: %s", *pinst); |
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diff
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|
469 if (strncmp(*pinst, "unlink ", 7) == 0) { |
2f0f352d4196
chg: use validate to make sure the server is up to date
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diff
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|
470 unlink(*pinst + 7); |
2f0f352d4196
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|
471 } else if (strncmp(*pinst, "redirect ", 9) == 0) { |
2f0f352d4196
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|
472 int r = snprintf(opts->redirectsockname, |
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|
473 sizeof(opts->redirectsockname), |
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diff
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|
474 "%s", *pinst + 9); |
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|
475 if (r < 0 || r >= (int)sizeof(opts->redirectsockname)) |
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|
476 abortmsg("redirect path is too long (%d)", r); |
28535
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|
477 needreconnect = 1; |
28516
3bf2892f685f
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diff
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|
478 } else if (strncmp(*pinst, "exit ", 5) == 0) { |
3bf2892f685f
chgserver: handle ParseError during validate
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diff
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|
479 int n = 0; |
3bf2892f685f
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diff
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|
480 if (sscanf(*pinst + 5, "%d", &n) != 1) |
3bf2892f685f
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diff
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|
481 abortmsg("cannot read the exit code"); |
3bf2892f685f
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|
482 exit(n); |
28535
aa082a8125da
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|
483 } else if (strcmp(*pinst, "reconnect") == 0) { |
aa082a8125da
chgserver: add an explicit "reconnect" instruction to validate
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diff
changeset
|
484 needreconnect = 1; |
28357
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chg: use validate to make sure the server is up to date
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diff
changeset
|
485 } else { |
2f0f352d4196
chg: use validate to make sure the server is up to date
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diff
changeset
|
486 abortmsg("unknown instruction: %s", *pinst); |
2f0f352d4196
chg: use validate to make sure the server is up to date
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diff
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|
487 } |
2f0f352d4196
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parents:
28327
diff
changeset
|
488 } |
28535
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chgserver: add an explicit "reconnect" instruction to validate
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diff
changeset
|
489 return needreconnect; |
28357
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changeset
|
490 } |
2f0f352d4196
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parents:
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diff
changeset
|
491 |
28260
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
parents:
28237
diff
changeset
|
492 /* |
0a17cfbe5429
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28237
diff
changeset
|
493 * Test whether the command is unsupported or not. This is not designed to |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
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|
494 * cover all cases. But it's fast, does not depend on the server and does |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
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|
495 * not return false positives. |
0a17cfbe5429
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diff
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|
496 */ |
0a17cfbe5429
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changeset
|
497 static int isunsupported(int argc, const char *argv[]) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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|
498 { |
0a17cfbe5429
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|
499 enum { |
0a17cfbe5429
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28237
diff
changeset
|
500 SERVE = 1, |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
changeset
|
501 DAEMON = 2, |
0a17cfbe5429
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28237
diff
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|
502 SERVEDAEMON = SERVE | DAEMON, |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
503 TIME = 4, |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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|
504 }; |
0a17cfbe5429
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28237
diff
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|
505 unsigned int state = 0; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
changeset
|
506 int i; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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diff
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|
507 for (i = 0; i < argc; ++i) { |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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diff
changeset
|
508 if (strcmp(argv[i], "--") == 0) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
509 break; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
changeset
|
510 if (i == 0 && strcmp("serve", argv[i]) == 0) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
511 state |= SERVE; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
512 else if (strcmp("-d", argv[i]) == 0 || |
0a17cfbe5429
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Jun Wu <quark@fb.com>
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28237
diff
changeset
|
513 strcmp("--daemon", argv[i]) == 0) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
514 state |= DAEMON; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
changeset
|
515 else if (strcmp("--time", argv[i]) == 0) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
parents:
28237
diff
changeset
|
516 state |= TIME; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
517 } |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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diff
changeset
|
518 return (state & TIME) == TIME || |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
519 (state & SERVEDAEMON) == SERVEDAEMON; |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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diff
changeset
|
520 } |
0a17cfbe5429
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diff
changeset
|
521 |
0a17cfbe5429
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28237
diff
changeset
|
522 static void execoriginalhg(const char *argv[]) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
changeset
|
523 { |
0a17cfbe5429
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Jun Wu <quark@fb.com>
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28237
diff
changeset
|
524 debugmsg("execute original hg"); |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
525 if (execvp(gethgcmd(), (char **)argv) < 0) |
28789
7f6e0a15189b
chg: replace abortmsg showing errno with abortmsgerrno
Jun Wu <quark@fb.com>
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28787
diff
changeset
|
526 abortmsgerrno("failed to exec original hg"); |
28260
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
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28237
diff
changeset
|
527 } |
0a17cfbe5429
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diff
changeset
|
528 |
28060 | 529 int main(int argc, const char *argv[], const char *envp[]) |
530 { | |
531 if (getenv("CHGDEBUG")) | |
532 enabledebugmsg(); | |
533 | |
28787
ea86cdcd9b50
chg: use color in debug/error messages conditionally
Jun Wu <quark@fb.com>
parents:
28769
diff
changeset
|
534 if (!getenv("HGPLAIN") && isatty(fileno(stderr))) |
ea86cdcd9b50
chg: use color in debug/error messages conditionally
Jun Wu <quark@fb.com>
parents:
28769
diff
changeset
|
535 enablecolor(); |
ea86cdcd9b50
chg: use color in debug/error messages conditionally
Jun Wu <quark@fb.com>
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28769
diff
changeset
|
536 |
28261 | 537 if (getenv("CHGINTERNALMARK")) |
538 abortmsg("chg started by chg detected.\n" | |
539 "Please make sure ${HG:-hg} is not a symlink or " | |
540 "wrapper to chg. Alternatively, set $CHGHG to the " | |
541 "path of real hg."); | |
542 | |
28260
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
543 if (isunsupported(argc - 1, argv + 1)) |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
544 execoriginalhg(argv); |
0a17cfbe5429
chg: fallback to original hg for some unsupported commands or flags
Jun Wu <quark@fb.com>
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28237
diff
changeset
|
545 |
28060 | 546 struct cmdserveropts opts; |
28167
66f6dad20c19
chg: pass sensitive command line flags to server
Jun Wu <quark@fb.com>
parents:
28086
diff
changeset
|
547 initcmdserveropts(&opts); |
28060 | 548 setcmdserveropts(&opts); |
28167
66f6dad20c19
chg: pass sensitive command line flags to server
Jun Wu <quark@fb.com>
parents:
28086
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549 setcmdserverargs(&opts, argc, argv); |
28060 | 550 |
551 if (argc == 2) { | |
28455 | 552 if (strcmp(argv[1], "--kill-chg-daemon") == 0) { |
553 killcmdserver(&opts); | |
28060 | 554 return 0; |
555 } | |
556 } | |
557 | |
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558 hgclient_t *hgc; |
28358 | 559 size_t retry = 0; |
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560 while (1) { |
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561 hgc = connectcmdserver(&opts); |
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562 if (!hgc) |
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563 abortmsg("cannot open hg client"); |
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564 hgc_setenv(hgc, envp); |
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565 const char **insts = hgc_validate(hgc, argv + 1, argc - 1); |
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566 int needreconnect = runinstructions(&opts, insts); |
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567 free(insts); |
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568 if (!needreconnect) |
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569 break; |
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570 hgc_close(hgc); |
28358 | 571 if (++retry > 10) |
572 abortmsg("too many redirections.\n" | |
573 "Please make sure %s is not a wrapper which " | |
574 "changes sensitive environment variables " | |
575 "before executing hg. If you have to use a " | |
576 "wrapper, wrap chg instead of hg.", | |
577 gethgcmd()); | |
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578 } |
28060 | 579 |
580 setupsignalhandler(hgc_peerpid(hgc)); | |
581 setuppager(hgc, argv + 1, argc - 1); | |
582 int exitcode = hgc_runcommand(hgc, argv + 1, argc - 1); | |
583 hgc_close(hgc); | |
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584 freecmdserveropts(&opts); |
28060 | 585 return exitcode; |
586 } |