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