Commit | Line | Data |
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07800601 IM |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
3 | #include "exec_cmd.h" | |
6e81c74c | 4 | #include "debug.h" |
07800601 IM |
5 | |
6 | static inline void close_pair(int fd[2]) | |
7 | { | |
8 | close(fd[0]); | |
9 | close(fd[1]); | |
10 | } | |
11 | ||
12 | static inline void dup_devnull(int to) | |
13 | { | |
14 | int fd = open("/dev/null", O_RDWR); | |
15 | dup2(fd, to); | |
16 | close(fd); | |
17 | } | |
18 | ||
19 | int start_command(struct child_process *cmd) | |
20 | { | |
21 | int need_in, need_out, need_err; | |
22 | int fdin[2], fdout[2], fderr[2]; | |
6e81c74c | 23 | char sbuf[STRERR_BUFSIZE]; |
07800601 IM |
24 | |
25 | /* | |
26 | * In case of errors we must keep the promise to close FDs | |
27 | * that have been passed in via ->in and ->out. | |
28 | */ | |
29 | ||
30 | need_in = !cmd->no_stdin && cmd->in < 0; | |
31 | if (need_in) { | |
32 | if (pipe(fdin) < 0) { | |
33 | if (cmd->out > 0) | |
34 | close(cmd->out); | |
35 | return -ERR_RUN_COMMAND_PIPE; | |
36 | } | |
37 | cmd->in = fdin[1]; | |
38 | } | |
39 | ||
40 | need_out = !cmd->no_stdout | |
41 | && !cmd->stdout_to_stderr | |
42 | && cmd->out < 0; | |
43 | if (need_out) { | |
44 | if (pipe(fdout) < 0) { | |
45 | if (need_in) | |
46 | close_pair(fdin); | |
47 | else if (cmd->in) | |
48 | close(cmd->in); | |
49 | return -ERR_RUN_COMMAND_PIPE; | |
50 | } | |
51 | cmd->out = fdout[0]; | |
52 | } | |
53 | ||
54 | need_err = !cmd->no_stderr && cmd->err < 0; | |
55 | if (need_err) { | |
56 | if (pipe(fderr) < 0) { | |
57 | if (need_in) | |
58 | close_pair(fdin); | |
59 | else if (cmd->in) | |
60 | close(cmd->in); | |
61 | if (need_out) | |
62 | close_pair(fdout); | |
63 | else if (cmd->out) | |
64 | close(cmd->out); | |
65 | return -ERR_RUN_COMMAND_PIPE; | |
66 | } | |
67 | cmd->err = fderr[0]; | |
68 | } | |
69 | ||
07800601 IM |
70 | fflush(NULL); |
71 | cmd->pid = fork(); | |
72 | if (!cmd->pid) { | |
73 | if (cmd->no_stdin) | |
74 | dup_devnull(0); | |
75 | else if (need_in) { | |
76 | dup2(fdin[0], 0); | |
77 | close_pair(fdin); | |
78 | } else if (cmd->in) { | |
79 | dup2(cmd->in, 0); | |
80 | close(cmd->in); | |
81 | } | |
82 | ||
83 | if (cmd->no_stderr) | |
84 | dup_devnull(2); | |
85 | else if (need_err) { | |
86 | dup2(fderr[1], 2); | |
87 | close_pair(fderr); | |
88 | } | |
89 | ||
90 | if (cmd->no_stdout) | |
91 | dup_devnull(1); | |
92 | else if (cmd->stdout_to_stderr) | |
93 | dup2(2, 1); | |
94 | else if (need_out) { | |
95 | dup2(fdout[1], 1); | |
96 | close_pair(fdout); | |
97 | } else if (cmd->out > 1) { | |
98 | dup2(cmd->out, 1); | |
99 | close(cmd->out); | |
100 | } | |
101 | ||
102 | if (cmd->dir && chdir(cmd->dir)) | |
103 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
6e81c74c | 104 | cmd->dir, strerror_r(errno, sbuf, sizeof(sbuf))); |
07800601 IM |
105 | if (cmd->env) { |
106 | for (; *cmd->env; cmd->env++) { | |
107 | if (strchr(*cmd->env, '=')) | |
108 | putenv((char*)*cmd->env); | |
109 | else | |
110 | unsetenv(*cmd->env); | |
111 | } | |
112 | } | |
113 | if (cmd->preexec_cb) | |
114 | cmd->preexec_cb(); | |
115 | if (cmd->perf_cmd) { | |
116 | execv_perf_cmd(cmd->argv); | |
117 | } else { | |
118 | execvp(cmd->argv[0], (char *const*) cmd->argv); | |
119 | } | |
120 | exit(127); | |
121 | } | |
07800601 IM |
122 | |
123 | if (cmd->pid < 0) { | |
124 | int err = errno; | |
125 | if (need_in) | |
126 | close_pair(fdin); | |
127 | else if (cmd->in) | |
128 | close(cmd->in); | |
129 | if (need_out) | |
130 | close_pair(fdout); | |
131 | else if (cmd->out) | |
132 | close(cmd->out); | |
133 | if (need_err) | |
134 | close_pair(fderr); | |
135 | return err == ENOENT ? | |
136 | -ERR_RUN_COMMAND_EXEC : | |
137 | -ERR_RUN_COMMAND_FORK; | |
138 | } | |
139 | ||
140 | if (need_in) | |
141 | close(fdin[0]); | |
142 | else if (cmd->in) | |
143 | close(cmd->in); | |
144 | ||
145 | if (need_out) | |
146 | close(fdout[1]); | |
147 | else if (cmd->out) | |
148 | close(cmd->out); | |
149 | ||
150 | if (need_err) | |
151 | close(fderr[1]); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static int wait_or_whine(pid_t pid) | |
157 | { | |
6e81c74c MH |
158 | char sbuf[STRERR_BUFSIZE]; |
159 | ||
07800601 IM |
160 | for (;;) { |
161 | int status, code; | |
162 | pid_t waiting = waitpid(pid, &status, 0); | |
163 | ||
164 | if (waiting < 0) { | |
165 | if (errno == EINTR) | |
166 | continue; | |
6e81c74c MH |
167 | error("waitpid failed (%s)", |
168 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
169 | return -ERR_RUN_COMMAND_WAITPID; |
170 | } | |
171 | if (waiting != pid) | |
172 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; | |
173 | if (WIFSIGNALED(status)) | |
174 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
175 | ||
176 | if (!WIFEXITED(status)) | |
177 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
178 | code = WEXITSTATUS(status); | |
179 | switch (code) { | |
180 | case 127: | |
181 | return -ERR_RUN_COMMAND_EXEC; | |
182 | case 0: | |
183 | return 0; | |
184 | default: | |
185 | return -code; | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
190 | int finish_command(struct child_process *cmd) | |
191 | { | |
192 | return wait_or_whine(cmd->pid); | |
193 | } | |
194 | ||
195 | int run_command(struct child_process *cmd) | |
196 | { | |
197 | int code = start_command(cmd); | |
198 | if (code) | |
199 | return code; | |
200 | return finish_command(cmd); | |
201 | } | |
202 | ||
203 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
204 | const char **argv, | |
205 | int opt) | |
206 | { | |
207 | memset(cmd, 0, sizeof(*cmd)); | |
208 | cmd->argv = argv; | |
209 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
210 | cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0; | |
211 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
212 | } | |
213 | ||
214 | int run_command_v_opt(const char **argv, int opt) | |
215 | { | |
216 | struct child_process cmd; | |
217 | prepare_run_command_v_opt(&cmd, argv, opt); | |
218 | return run_command(&cmd); | |
219 | } |