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Commit | Line | Data |
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b1bf95bb JW |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
77cb17e9 | 3 | #include "exec_cmd.h" |
b1bf95bb | 4 | |
9dc09c76 SP |
5 | static inline void close_pair(int fd[2]) |
6 | { | |
7 | close(fd[0]); | |
8 | close(fd[1]); | |
9 | } | |
10 | ||
e4507ae8 SP |
11 | static inline void dup_devnull(int to) |
12 | { | |
13 | int fd = open("/dev/null", O_RDWR); | |
14 | dup2(fd, to); | |
15 | close(fd); | |
16 | } | |
17 | ||
ebcb5d16 | 18 | int start_command(struct child_process *cmd) |
b1bf95bb | 19 | { |
f3b33f1d JS |
20 | int need_in, need_out, need_err; |
21 | int fdin[2], fdout[2], fderr[2]; | |
4919bf03 | 22 | |
c20181e3 JS |
23 | /* |
24 | * In case of errors we must keep the promise to close FDs | |
25 | * that have been passed in via ->in and ->out. | |
26 | */ | |
27 | ||
e4507ae8 | 28 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 29 | if (need_in) { |
c20181e3 JS |
30 | if (pipe(fdin) < 0) { |
31 | if (cmd->out > 0) | |
32 | close(cmd->out); | |
4919bf03 | 33 | return -ERR_RUN_COMMAND_PIPE; |
c20181e3 | 34 | } |
4919bf03 | 35 | cmd->in = fdin[1]; |
4919bf03 SP |
36 | } |
37 | ||
e4507ae8 SP |
38 | need_out = !cmd->no_stdout |
39 | && !cmd->stdout_to_stderr | |
40 | && cmd->out < 0; | |
f4bba25b SP |
41 | if (need_out) { |
42 | if (pipe(fdout) < 0) { | |
43 | if (need_in) | |
44 | close_pair(fdin); | |
c20181e3 JS |
45 | else if (cmd->in) |
46 | close(cmd->in); | |
f4bba25b SP |
47 | return -ERR_RUN_COMMAND_PIPE; |
48 | } | |
49 | cmd->out = fdout[0]; | |
f4bba25b SP |
50 | } |
51 | ||
b73a4397 | 52 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
53 | if (need_err) { |
54 | if (pipe(fderr) < 0) { | |
55 | if (need_in) | |
56 | close_pair(fdin); | |
c20181e3 JS |
57 | else if (cmd->in) |
58 | close(cmd->in); | |
f3b33f1d JS |
59 | if (need_out) |
60 | close_pair(fdout); | |
c20181e3 JS |
61 | else if (cmd->out) |
62 | close(cmd->out); | |
f3b33f1d JS |
63 | return -ERR_RUN_COMMAND_PIPE; |
64 | } | |
65 | cmd->err = fderr[0]; | |
66 | } | |
67 | ||
ebcb5d16 | 68 | cmd->pid = fork(); |
4919bf03 | 69 | if (cmd->pid < 0) { |
9dc09c76 SP |
70 | if (need_in) |
71 | close_pair(fdin); | |
c20181e3 JS |
72 | else if (cmd->in) |
73 | close(cmd->in); | |
f4bba25b SP |
74 | if (need_out) |
75 | close_pair(fdout); | |
c20181e3 JS |
76 | else if (cmd->out) |
77 | close(cmd->out); | |
f3b33f1d JS |
78 | if (need_err) |
79 | close_pair(fderr); | |
b1bf95bb | 80 | return -ERR_RUN_COMMAND_FORK; |
4919bf03 SP |
81 | } |
82 | ||
ebcb5d16 | 83 | if (!cmd->pid) { |
e4507ae8 SP |
84 | if (cmd->no_stdin) |
85 | dup_devnull(0); | |
86 | else if (need_in) { | |
4919bf03 | 87 | dup2(fdin[0], 0); |
9dc09c76 | 88 | close_pair(fdin); |
4919bf03 SP |
89 | } else if (cmd->in) { |
90 | dup2(cmd->in, 0); | |
91 | close(cmd->in); | |
95d3c4f5 | 92 | } |
4919bf03 | 93 | |
ce2cf27a CC |
94 | if (cmd->no_stderr) |
95 | dup_devnull(2); | |
96 | else if (need_err) { | |
97 | dup2(fderr[1], 2); | |
98 | close_pair(fderr); | |
99 | } | |
100 | ||
e4507ae8 SP |
101 | if (cmd->no_stdout) |
102 | dup_devnull(1); | |
103 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 104 | dup2(2, 1); |
f4bba25b SP |
105 | else if (need_out) { |
106 | dup2(fdout[1], 1); | |
107 | close_pair(fdout); | |
108 | } else if (cmd->out > 1) { | |
109 | dup2(cmd->out, 1); | |
110 | close(cmd->out); | |
111 | } | |
112 | ||
1568fea0 AR |
113 | if (cmd->dir && chdir(cmd->dir)) |
114 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
115 | cmd->dir, strerror(errno)); | |
ee493148 | 116 | if (cmd->env) { |
3427b375 AR |
117 | for (; *cmd->env; cmd->env++) { |
118 | if (strchr(*cmd->env, '=')) | |
119 | putenv((char*)*cmd->env); | |
120 | else | |
121 | unsetenv(*cmd->env); | |
122 | } | |
ee493148 | 123 | } |
f1000898 SP |
124 | if (cmd->git_cmd) { |
125 | execv_git_cmd(cmd->argv); | |
77cb17e9 | 126 | } else { |
f1000898 | 127 | execvp(cmd->argv[0], (char *const*) cmd->argv); |
128aed68 | 128 | } |
f1000898 | 129 | die("exec %s failed.", cmd->argv[0]); |
b1bf95bb | 130 | } |
4919bf03 SP |
131 | |
132 | if (need_in) | |
133 | close(fdin[0]); | |
134 | else if (cmd->in) | |
135 | close(cmd->in); | |
136 | ||
f4bba25b SP |
137 | if (need_out) |
138 | close(fdout[1]); | |
c20181e3 | 139 | else if (cmd->out) |
f4bba25b SP |
140 | close(cmd->out); |
141 | ||
f3b33f1d JS |
142 | if (need_err) |
143 | close(fderr[1]); | |
144 | ||
ebcb5d16 SP |
145 | return 0; |
146 | } | |
147 | ||
2d22c208 | 148 | static int wait_or_whine(pid_t pid) |
ebcb5d16 | 149 | { |
b1bf95bb JW |
150 | for (;;) { |
151 | int status, code; | |
2d22c208 | 152 | pid_t waiting = waitpid(pid, &status, 0); |
b1bf95bb | 153 | |
6f002f98 | 154 | if (waiting < 0) { |
b1bf95bb JW |
155 | if (errno == EINTR) |
156 | continue; | |
6f002f98 | 157 | error("waitpid failed (%s)", strerror(errno)); |
b1bf95bb JW |
158 | return -ERR_RUN_COMMAND_WAITPID; |
159 | } | |
2d22c208 | 160 | if (waiting != pid) |
b1bf95bb JW |
161 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; |
162 | if (WIFSIGNALED(status)) | |
163 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
164 | ||
165 | if (!WIFEXITED(status)) | |
166 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
167 | code = WEXITSTATUS(status); | |
168 | if (code) | |
169 | return -code; | |
170 | return 0; | |
171 | } | |
172 | } | |
f1000898 | 173 | |
2d22c208 JS |
174 | int finish_command(struct child_process *cmd) |
175 | { | |
2d22c208 JS |
176 | return wait_or_whine(cmd->pid); |
177 | } | |
178 | ||
ebcb5d16 SP |
179 | int run_command(struct child_process *cmd) |
180 | { | |
181 | int code = start_command(cmd); | |
182 | if (code) | |
183 | return code; | |
184 | return finish_command(cmd); | |
185 | } | |
186 | ||
1568fea0 | 187 | static void prepare_run_command_v_opt(struct child_process *cmd, |
ee493148 AR |
188 | const char **argv, |
189 | int opt) | |
1568fea0 AR |
190 | { |
191 | memset(cmd, 0, sizeof(*cmd)); | |
192 | cmd->argv = argv; | |
193 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
194 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
195 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
196 | } | |
197 | ||
f1000898 SP |
198 | int run_command_v_opt(const char **argv, int opt) |
199 | { | |
200 | struct child_process cmd; | |
1568fea0 AR |
201 | prepare_run_command_v_opt(&cmd, argv, opt); |
202 | return run_command(&cmd); | |
203 | } | |
204 | ||
205 | int run_command_v_opt_cd(const char **argv, int opt, const char *dir) | |
206 | { | |
207 | struct child_process cmd; | |
208 | prepare_run_command_v_opt(&cmd, argv, opt); | |
209 | cmd.dir = dir; | |
f1000898 SP |
210 | return run_command(&cmd); |
211 | } | |
ee493148 AR |
212 | |
213 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
214 | { | |
215 | struct child_process cmd; | |
216 | prepare_run_command_v_opt(&cmd, argv, opt); | |
217 | cmd.dir = dir; | |
218 | cmd.env = env; | |
219 | return run_command(&cmd); | |
220 | } | |
2d22c208 JS |
221 | |
222 | int start_async(struct async *async) | |
223 | { | |
224 | int pipe_out[2]; | |
225 | ||
226 | if (pipe(pipe_out) < 0) | |
227 | return error("cannot create pipe: %s", strerror(errno)); | |
228 | ||
229 | async->pid = fork(); | |
230 | if (async->pid < 0) { | |
231 | error("fork (async) failed: %s", strerror(errno)); | |
232 | close_pair(pipe_out); | |
233 | return -1; | |
234 | } | |
235 | if (!async->pid) { | |
236 | close(pipe_out[0]); | |
237 | exit(!!async->proc(pipe_out[1], async->data)); | |
238 | } | |
239 | async->out = pipe_out[0]; | |
240 | close(pipe_out[1]); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | int finish_async(struct async *async) | |
245 | { | |
246 | int ret = 0; | |
247 | ||
248 | if (wait_or_whine(async->pid)) | |
249 | ret = error("waitpid (async) failed"); | |
250 | return ret; | |
251 | } |