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