Mercurial > hg
annotate contrib/chg/chg.c @ 30741:fde9692a02c0
chg: remove getpager support
We have enough bits to switch to the new chg pager code path in runcommand.
So just remove the legacy getpager support.
This is a red-only patch, and will break chg's pager support temporarily.
author | Jun Wu <quark@fb.com> |
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date | Tue, 10 Jan 2017 06:59:39 +0800 |
parents | baee0f47b533 |
children | a68510b69f41 |
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" | |
30693 | 26 #include "procutil.h" |
28060 | 27 #include "util.h" |
28 | |
30677 | 29 #ifndef PATH_MAX |
30 #define PATH_MAX 4096 | |
28060 | 31 #endif |
32 | |
33 struct cmdserveropts { | |
30677 | 34 char sockname[PATH_MAX]; |
35 char initsockname[PATH_MAX]; | |
36 char redirectsockname[PATH_MAX]; | |
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37 size_t argsize; |
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38 const char **args; |
28060 | 39 }; |
40 | |
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41 static void initcmdserveropts(struct cmdserveropts *opts) { |
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42 memset(opts, 0, sizeof(struct cmdserveropts)); |
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43 } |
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44 |
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45 static void freecmdserveropts(struct cmdserveropts *opts) { |
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46 free(opts->args); |
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47 opts->args = NULL; |
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48 opts->argsize = 0; |
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49 } |
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50 |
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51 /* |
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52 * Test if an argument is a sensitive flag that should be passed to the server. |
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53 * Return 0 if not, otherwise the number of arguments starting from the current |
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54 * one that should be passed to the server. |
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55 */ |
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56 static size_t testsensitiveflag(const char *arg) |
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57 { |
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58 static const struct { |
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59 const char *name; |
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60 size_t narg; |
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61 } flags[] = { |
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62 {"--config", 1}, |
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63 {"--cwd", 1}, |
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64 {"--repo", 1}, |
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65 {"--repository", 1}, |
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66 {"--traceback", 0}, |
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67 {"-R", 1}, |
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68 }; |
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69 size_t i; |
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70 for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i) { |
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71 size_t len = strlen(flags[i].name); |
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72 size_t narg = flags[i].narg; |
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73 if (memcmp(arg, flags[i].name, len) == 0) { |
28790 | 74 if (arg[len] == '\0') { |
75 /* --flag (value) */ | |
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76 return narg + 1; |
28790 | 77 } else if (arg[len] == '=' && narg > 0) { |
78 /* --flag=value */ | |
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79 return 1; |
28790 | 80 } else if (flags[i].name[1] != '-') { |
81 /* short flag */ | |
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82 return 1; |
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83 } |
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84 } |
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85 } |
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86 return 0; |
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87 } |
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88 |
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89 /* |
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90 * Parse argv[] and put sensitive flags to opts->args |
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91 */ |
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92 static void setcmdserverargs(struct cmdserveropts *opts, |
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93 int argc, const char *argv[]) |
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94 { |
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95 size_t i, step; |
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96 opts->argsize = 0; |
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97 for (i = 0, step = 1; i < (size_t)argc; i += step, step = 1) { |
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98 if (!argv[i]) |
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99 continue; /* pass clang-analyse */ |
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100 if (strcmp(argv[i], "--") == 0) |
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101 break; |
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102 size_t n = testsensitiveflag(argv[i]); |
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103 if (n == 0 || i + n > (size_t)argc) |
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104 continue; |
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105 opts->args = reallocx(opts->args, |
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106 (n + opts->argsize) * sizeof(char *)); |
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107 memcpy(opts->args + opts->argsize, argv + i, |
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108 sizeof(char *) * n); |
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109 opts->argsize += n; |
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110 step = n; |
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111 } |
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112 } |
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113 |
28060 | 114 static void preparesockdir(const char *sockdir) |
115 { | |
116 int r; | |
117 r = mkdir(sockdir, 0700); | |
118 if (r < 0 && errno != EEXIST) | |
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119 abortmsgerrno("cannot create sockdir %s", sockdir); |
28060 | 120 |
121 struct stat st; | |
122 r = lstat(sockdir, &st); | |
123 if (r < 0) | |
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124 abortmsgerrno("cannot stat %s", sockdir); |
28060 | 125 if (!S_ISDIR(st.st_mode)) |
126 abortmsg("cannot create sockdir %s (file exists)", sockdir); | |
127 if (st.st_uid != geteuid() || st.st_mode & 0077) | |
128 abortmsg("insecure sockdir %s", sockdir); | |
129 } | |
130 | |
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131 static void getdefaultsockdir(char sockdir[], size_t size) |
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132 { |
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133 /* by default, put socket file in secure directory |
30681 | 134 * (${XDG_RUNTIME_DIR}/chg, or /${TMPDIR:-tmp}/chg$UID) |
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135 * (permission of socket file may be ignored on some Unices) */ |
30681 | 136 const char *runtimedir = getenv("XDG_RUNTIME_DIR"); |
137 int r; | |
138 if (runtimedir) { | |
139 r = snprintf(sockdir, size, "%s/chg", runtimedir); | |
140 } else { | |
141 const char *tmpdir = getenv("TMPDIR"); | |
142 if (!tmpdir) | |
143 tmpdir = "/tmp"; | |
144 r = snprintf(sockdir, size, "%s/chg%d", tmpdir, geteuid()); | |
145 } | |
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146 if (r < 0 || (size_t)r >= size) |
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147 abortmsg("too long TMPDIR (r = %d)", r); |
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148 } |
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149 |
28060 | 150 static void setcmdserveropts(struct cmdserveropts *opts) |
151 { | |
152 int r; | |
30677 | 153 char sockdir[PATH_MAX]; |
28060 | 154 const char *envsockname = getenv("CHGSOCKNAME"); |
155 if (!envsockname) { | |
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156 getdefaultsockdir(sockdir, sizeof(sockdir)); |
28060 | 157 preparesockdir(sockdir); |
158 } | |
159 | |
160 const char *basename = (envsockname) ? envsockname : sockdir; | |
161 const char *sockfmt = (envsockname) ? "%s" : "%s/server"; | |
162 r = snprintf(opts->sockname, sizeof(opts->sockname), sockfmt, basename); | |
163 if (r < 0 || (size_t)r >= sizeof(opts->sockname)) | |
164 abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); | |
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165 r = snprintf(opts->initsockname, sizeof(opts->initsockname), |
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166 "%s.%u", opts->sockname, (unsigned)getpid()); |
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167 if (r < 0 || (size_t)r >= sizeof(opts->initsockname)) |
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168 abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r); |
28060 | 169 } |
170 | |
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171 static const char *gethgcmd(void) |
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172 { |
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173 static const char *hgcmd = NULL; |
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174 if (!hgcmd) { |
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175 hgcmd = getenv("CHGHG"); |
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176 if (!hgcmd || hgcmd[0] == '\0') |
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177 hgcmd = getenv("HG"); |
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178 if (!hgcmd || hgcmd[0] == '\0') |
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179 #ifdef HGPATH |
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180 hgcmd = (HGPATH); |
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181 #else |
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182 hgcmd = "hg"; |
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183 #endif |
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184 } |
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185 return hgcmd; |
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186 } |
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187 |
28060 | 188 static void execcmdserver(const struct cmdserveropts *opts) |
189 { | |
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190 const char *hgcmd = gethgcmd(); |
28060 | 191 |
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192 const char *baseargv[] = { |
28060 | 193 hgcmd, |
194 "serve", | |
195 "--cmdserver", "chgunix", | |
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196 "--address", opts->initsockname, |
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197 "--daemon-postexec", "chdir:/", |
28060 | 198 }; |
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199 size_t baseargvsize = sizeof(baseargv) / sizeof(baseargv[0]); |
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200 size_t argsize = baseargvsize + opts->argsize + 1; |
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201 |
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202 const char **argv = mallocx(sizeof(char *) * argsize); |
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203 memcpy(argv, baseargv, sizeof(baseargv)); |
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204 memcpy(argv + baseargvsize, opts->args, sizeof(char *) * opts->argsize); |
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205 argv[argsize - 1] = NULL; |
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206 |
28261 | 207 if (putenv("CHGINTERNALMARK=") != 0) |
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208 abortmsgerrno("failed to putenv"); |
28060 | 209 if (execvp(hgcmd, (char **)argv) < 0) |
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210 abortmsgerrno("failed to exec cmdserver"); |
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211 free(argv); |
28060 | 212 } |
213 | |
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214 /* Retry until we can connect to the server. Give up after some time. */ |
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215 static hgclient_t *retryconnectcmdserver(struct cmdserveropts *opts, pid_t pid) |
28060 | 216 { |
217 static const struct timespec sleepreq = {0, 10 * 1000000}; | |
218 int pst = 0; | |
219 | |
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220 debugmsg("try connect to %s repeatedly", opts->initsockname); |
29345 | 221 |
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222 unsigned int timeoutsec = 60; /* default: 60 seconds */ |
29345 | 223 const char *timeoutenv = getenv("CHGTIMEOUT"); |
224 if (timeoutenv) | |
225 sscanf(timeoutenv, "%u", &timeoutsec); | |
226 | |
227 for (unsigned int i = 0; !timeoutsec || i < timeoutsec * 100; i++) { | |
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228 hgclient_t *hgc = hgc_open(opts->initsockname); |
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229 if (hgc) { |
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230 debugmsg("rename %s to %s", opts->initsockname, |
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231 opts->sockname); |
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232 int r = rename(opts->initsockname, opts->sockname); |
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233 if (r != 0) |
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234 abortmsgerrno("cannot rename"); |
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235 return hgc; |
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236 } |
28060 | 237 |
238 if (pid > 0) { | |
239 /* collect zombie if child process fails to start */ | |
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240 int r = waitpid(pid, &pst, WNOHANG); |
28060 | 241 if (r != 0) |
242 goto cleanup; | |
243 } | |
244 | |
245 nanosleep(&sleepreq, NULL); | |
246 } | |
247 | |
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248 abortmsg("timed out waiting for cmdserver %s", opts->initsockname); |
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249 return NULL; |
28060 | 250 |
251 cleanup: | |
252 if (WIFEXITED(pst)) { | |
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253 if (WEXITSTATUS(pst) == 0) |
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254 abortmsg("could not connect to cmdserver " |
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255 "(exited with status 0)"); |
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256 debugmsg("cmdserver exited with status %d", WEXITSTATUS(pst)); |
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257 exit(WEXITSTATUS(pst)); |
28060 | 258 } else if (WIFSIGNALED(pst)) { |
259 abortmsg("cmdserver killed by signal %d", WTERMSIG(pst)); | |
260 } else { | |
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261 abortmsg("error while waiting for cmdserver"); |
28060 | 262 } |
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263 return NULL; |
28060 | 264 } |
265 | |
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266 /* Connect to a cmdserver. Will start a new server on demand. */ |
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267 static hgclient_t *connectcmdserver(struct cmdserveropts *opts) |
28060 | 268 { |
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269 const char *sockname = opts->redirectsockname[0] ? |
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270 opts->redirectsockname : opts->sockname; |
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271 debugmsg("try connect to %s", sockname); |
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272 hgclient_t *hgc = hgc_open(sockname); |
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273 if (hgc) |
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274 return hgc; |
28060 | 275 |
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276 /* prevent us from being connected to an outdated server: we were |
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277 * told by a server to redirect to opts->redirectsockname and that |
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278 * address does not work. we do not want to connect to the server |
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279 * again because it will probably tell us the same thing. */ |
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280 if (sockname == opts->redirectsockname) |
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281 unlink(opts->sockname); |
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282 |
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283 debugmsg("start cmdserver at %s", opts->initsockname); |
28060 | 284 |
285 pid_t pid = fork(); | |
286 if (pid < 0) | |
287 abortmsg("failed to fork cmdserver process"); | |
288 if (pid == 0) { | |
289 execcmdserver(opts); | |
290 } else { | |
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291 hgc = retryconnectcmdserver(opts, pid); |
28060 | 292 } |
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293 |
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294 return hgc; |
28060 | 295 } |
296 | |
28455 | 297 static void killcmdserver(const struct cmdserveropts *opts) |
28060 | 298 { |
28455 | 299 /* resolve config hash */ |
300 char *resolvedpath = realpath(opts->sockname, NULL); | |
301 if (resolvedpath) { | |
302 unlink(resolvedpath); | |
303 free(resolvedpath); | |
28060 | 304 } |
305 } | |
306 | |
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307 /* Run instructions sent from the server like unlink and set redirect path |
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308 * Return 1 if reconnect is needed, otherwise 0 */ |
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309 static int runinstructions(struct cmdserveropts *opts, const char **insts) |
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310 { |
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311 int needreconnect = 0; |
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312 if (!insts) |
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313 return needreconnect; |
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314 |
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315 assert(insts); |
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316 opts->redirectsockname[0] = '\0'; |
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317 const char **pinst; |
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318 for (pinst = insts; *pinst; pinst++) { |
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319 debugmsg("instruction: %s", *pinst); |
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320 if (strncmp(*pinst, "unlink ", 7) == 0) { |
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321 unlink(*pinst + 7); |
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322 } else if (strncmp(*pinst, "redirect ", 9) == 0) { |
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323 int r = snprintf(opts->redirectsockname, |
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324 sizeof(opts->redirectsockname), |
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325 "%s", *pinst + 9); |
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326 if (r < 0 || r >= (int)sizeof(opts->redirectsockname)) |
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327 abortmsg("redirect path is too long (%d)", r); |
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328 needreconnect = 1; |
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329 } else if (strncmp(*pinst, "exit ", 5) == 0) { |
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330 int n = 0; |
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331 if (sscanf(*pinst + 5, "%d", &n) != 1) |
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332 abortmsg("cannot read the exit code"); |
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333 exit(n); |
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334 } else if (strcmp(*pinst, "reconnect") == 0) { |
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335 needreconnect = 1; |
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336 } else { |
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337 abortmsg("unknown instruction: %s", *pinst); |
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338 } |
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339 } |
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340 return needreconnect; |
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341 } |
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342 |
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343 /* |
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344 * Test whether the command is unsupported or not. This is not designed to |
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345 * cover all cases. But it's fast, does not depend on the server and does |
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346 * not return false positives. |
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347 */ |
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348 static int isunsupported(int argc, const char *argv[]) |
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349 { |
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350 enum { |
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351 SERVE = 1, |
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352 DAEMON = 2, |
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353 SERVEDAEMON = SERVE | DAEMON, |
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354 TIME = 4, |
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355 }; |
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356 unsigned int state = 0; |
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357 int i; |
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358 for (i = 0; i < argc; ++i) { |
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359 if (strcmp(argv[i], "--") == 0) |
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360 break; |
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361 if (i == 0 && strcmp("serve", argv[i]) == 0) |
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362 state |= SERVE; |
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363 else if (strcmp("-d", argv[i]) == 0 || |
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364 strcmp("--daemon", argv[i]) == 0) |
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365 state |= DAEMON; |
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366 else if (strcmp("--time", argv[i]) == 0) |
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367 state |= TIME; |
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368 } |
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369 return (state & TIME) == TIME || |
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370 (state & SERVEDAEMON) == SERVEDAEMON; |
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371 } |
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372 |
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373 static void execoriginalhg(const char *argv[]) |
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374 { |
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375 debugmsg("execute original hg"); |
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376 if (execvp(gethgcmd(), (char **)argv) < 0) |
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377 abortmsgerrno("failed to exec original hg"); |
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378 } |
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379 |
28060 | 380 int main(int argc, const char *argv[], const char *envp[]) |
381 { | |
382 if (getenv("CHGDEBUG")) | |
383 enabledebugmsg(); | |
384 | |
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385 if (!getenv("HGPLAIN") && isatty(fileno(stderr))) |
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386 enablecolor(); |
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387 |
28261 | 388 if (getenv("CHGINTERNALMARK")) |
389 abortmsg("chg started by chg detected.\n" | |
390 "Please make sure ${HG:-hg} is not a symlink or " | |
391 "wrapper to chg. Alternatively, set $CHGHG to the " | |
392 "path of real hg."); | |
393 | |
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394 if (isunsupported(argc - 1, argv + 1)) |
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395 execoriginalhg(argv); |
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396 |
28060 | 397 struct cmdserveropts opts; |
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398 initcmdserveropts(&opts); |
28060 | 399 setcmdserveropts(&opts); |
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400 setcmdserverargs(&opts, argc, argv); |
28060 | 401 |
402 if (argc == 2) { | |
28455 | 403 if (strcmp(argv[1], "--kill-chg-daemon") == 0) { |
404 killcmdserver(&opts); | |
28060 | 405 return 0; |
406 } | |
407 } | |
408 | |
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409 hgclient_t *hgc; |
28358 | 410 size_t retry = 0; |
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411 while (1) { |
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412 hgc = connectcmdserver(&opts); |
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413 if (!hgc) |
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414 abortmsg("cannot open hg client"); |
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415 hgc_setenv(hgc, envp); |
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416 const char **insts = hgc_validate(hgc, argv + 1, argc - 1); |
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417 int needreconnect = runinstructions(&opts, insts); |
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418 free(insts); |
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419 if (!needreconnect) |
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420 break; |
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421 hgc_close(hgc); |
28358 | 422 if (++retry > 10) |
423 abortmsg("too many redirections.\n" | |
424 "Please make sure %s is not a wrapper which " | |
425 "changes sensitive environment variables " | |
426 "before executing hg. If you have to use a " | |
427 "wrapper, wrap chg instead of hg.", | |
428 gethgcmd()); | |
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429 } |
28060 | 430 |
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431 setupsignalhandler(hgc_peerpid(hgc), hgc_peerpgid(hgc)); |
28060 | 432 int exitcode = hgc_runcommand(hgc, argv + 1, argc - 1); |
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433 restoresignalhandler(); |
28060 | 434 hgc_close(hgc); |
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435 freecmdserveropts(&opts); |
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436 waitpager(); |
29344 | 437 |
28060 | 438 return exitcode; |
439 } |