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1 | #include "cache.h" | |
2 | #include "run-command.h" | |
3 | #include "exec_cmd.h" | |
4 | ||
5 | static inline void close_pair(int fd[2]) | |
6 | { | |
7 | close(fd[0]); | |
8 | close(fd[1]); | |
9 | } | |
10 | ||
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 | ||
18 | int start_command(struct child_process *cmd) | |
19 | { | |
20 | int need_in, need_out, need_err; | |
21 | int fdin[2], fdout[2], fderr[2]; | |
22 | ||
23 | need_in = !cmd->no_stdin && cmd->in < 0; | |
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 | ||
31 | need_out = !cmd->no_stdout | |
32 | && !cmd->stdout_to_stderr | |
33 | && cmd->out < 0; | |
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 | ||
44 | need_err = cmd->err < 0; | |
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 | ||
56 | cmd->pid = fork(); | |
57 | if (cmd->pid < 0) { | |
58 | if (need_in) | |
59 | close_pair(fdin); | |
60 | if (need_out) | |
61 | close_pair(fdout); | |
62 | if (need_err) | |
63 | close_pair(fderr); | |
64 | return -ERR_RUN_COMMAND_FORK; | |
65 | } | |
66 | ||
67 | if (!cmd->pid) { | |
68 | if (cmd->no_stdin) | |
69 | dup_devnull(0); | |
70 | else if (need_in) { | |
71 | dup2(fdin[0], 0); | |
72 | close_pair(fdin); | |
73 | } else if (cmd->in) { | |
74 | dup2(cmd->in, 0); | |
75 | close(cmd->in); | |
76 | } | |
77 | ||
78 | if (cmd->no_stdout) | |
79 | dup_devnull(1); | |
80 | else if (cmd->stdout_to_stderr) | |
81 | dup2(2, 1); | |
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 | ||
90 | if (need_err) { | |
91 | dup2(fderr[1], 2); | |
92 | close_pair(fderr); | |
93 | } | |
94 | ||
95 | if (cmd->dir && chdir(cmd->dir)) | |
96 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
97 | cmd->dir, strerror(errno)); | |
98 | if (cmd->env) { | |
99 | for (; *cmd->env; cmd->env++) { | |
100 | if (strchr(*cmd->env, '=')) | |
101 | putenv((char*)*cmd->env); | |
102 | else | |
103 | unsetenv(*cmd->env); | |
104 | } | |
105 | } | |
106 | if (cmd->git_cmd) { | |
107 | execv_git_cmd(cmd->argv); | |
108 | } else { | |
109 | execvp(cmd->argv[0], (char *const*) cmd->argv); | |
110 | } | |
111 | die("exec %s failed.", cmd->argv[0]); | |
112 | } | |
113 | ||
114 | if (need_in) | |
115 | close(fdin[0]); | |
116 | else if (cmd->in) | |
117 | close(cmd->in); | |
118 | ||
119 | if (need_out) | |
120 | close(fdout[1]); | |
121 | else if (cmd->out > 1) | |
122 | close(cmd->out); | |
123 | ||
124 | if (need_err) | |
125 | close(fderr[1]); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | int finish_command(struct child_process *cmd) | |
131 | { | |
132 | if (cmd->close_in) | |
133 | close(cmd->in); | |
134 | if (cmd->close_out) | |
135 | close(cmd->out); | |
136 | ||
137 | for (;;) { | |
138 | int status, code; | |
139 | pid_t waiting = waitpid(cmd->pid, &status, 0); | |
140 | ||
141 | if (waiting < 0) { | |
142 | if (errno == EINTR) | |
143 | continue; | |
144 | error("waitpid failed (%s)", strerror(errno)); | |
145 | return -ERR_RUN_COMMAND_WAITPID; | |
146 | } | |
147 | if (waiting != cmd->pid) | |
148 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; | |
149 | if (WIFSIGNALED(status)) | |
150 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
151 | ||
152 | if (!WIFEXITED(status)) | |
153 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
154 | code = WEXITSTATUS(status); | |
155 | if (code) | |
156 | return -code; | |
157 | return 0; | |
158 | } | |
159 | } | |
160 | ||
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 | ||
169 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
170 | const char **argv, | |
171 | int opt) | |
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 | ||
180 | int run_command_v_opt(const char **argv, int opt) | |
181 | { | |
182 | struct child_process cmd; | |
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; | |
192 | return run_command(&cmd); | |
193 | } | |
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 | } |