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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 | { |
e4507ae8 | 20 | int need_in, need_out; |
f4bba25b | 21 | int fdin[2], fdout[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 | ||
ebcb5d16 | 44 | cmd->pid = fork(); |
4919bf03 | 45 | if (cmd->pid < 0) { |
9dc09c76 SP |
46 | if (need_in) |
47 | close_pair(fdin); | |
f4bba25b SP |
48 | if (need_out) |
49 | close_pair(fdout); | |
b1bf95bb | 50 | return -ERR_RUN_COMMAND_FORK; |
4919bf03 SP |
51 | } |
52 | ||
ebcb5d16 | 53 | if (!cmd->pid) { |
e4507ae8 SP |
54 | if (cmd->no_stdin) |
55 | dup_devnull(0); | |
56 | else if (need_in) { | |
4919bf03 | 57 | dup2(fdin[0], 0); |
9dc09c76 | 58 | close_pair(fdin); |
4919bf03 SP |
59 | } else if (cmd->in) { |
60 | dup2(cmd->in, 0); | |
61 | close(cmd->in); | |
95d3c4f5 | 62 | } |
4919bf03 | 63 | |
e4507ae8 SP |
64 | if (cmd->no_stdout) |
65 | dup_devnull(1); | |
66 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 67 | dup2(2, 1); |
f4bba25b SP |
68 | else if (need_out) { |
69 | dup2(fdout[1], 1); | |
70 | close_pair(fdout); | |
71 | } else if (cmd->out > 1) { | |
72 | dup2(cmd->out, 1); | |
73 | close(cmd->out); | |
74 | } | |
75 | ||
1568fea0 AR |
76 | if (cmd->dir && chdir(cmd->dir)) |
77 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
78 | cmd->dir, strerror(errno)); | |
f1000898 SP |
79 | if (cmd->git_cmd) { |
80 | execv_git_cmd(cmd->argv); | |
77cb17e9 | 81 | } else { |
f1000898 | 82 | execvp(cmd->argv[0], (char *const*) cmd->argv); |
128aed68 | 83 | } |
f1000898 | 84 | die("exec %s failed.", cmd->argv[0]); |
b1bf95bb | 85 | } |
4919bf03 SP |
86 | |
87 | if (need_in) | |
88 | close(fdin[0]); | |
89 | else if (cmd->in) | |
90 | close(cmd->in); | |
91 | ||
f4bba25b SP |
92 | if (need_out) |
93 | close(fdout[1]); | |
94 | else if (cmd->out > 1) | |
95 | close(cmd->out); | |
96 | ||
ebcb5d16 SP |
97 | return 0; |
98 | } | |
99 | ||
100 | int finish_command(struct child_process *cmd) | |
101 | { | |
4919bf03 SP |
102 | if (cmd->close_in) |
103 | close(cmd->in); | |
f4bba25b SP |
104 | if (cmd->close_out) |
105 | close(cmd->out); | |
4919bf03 | 106 | |
b1bf95bb JW |
107 | for (;;) { |
108 | int status, code; | |
ebcb5d16 | 109 | pid_t waiting = waitpid(cmd->pid, &status, 0); |
b1bf95bb | 110 | |
6f002f98 | 111 | if (waiting < 0) { |
b1bf95bb JW |
112 | if (errno == EINTR) |
113 | continue; | |
6f002f98 | 114 | error("waitpid failed (%s)", strerror(errno)); |
b1bf95bb JW |
115 | return -ERR_RUN_COMMAND_WAITPID; |
116 | } | |
ebcb5d16 | 117 | if (waiting != cmd->pid) |
b1bf95bb JW |
118 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; |
119 | if (WIFSIGNALED(status)) | |
120 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
121 | ||
122 | if (!WIFEXITED(status)) | |
123 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
124 | code = WEXITSTATUS(status); | |
125 | if (code) | |
126 | return -code; | |
127 | return 0; | |
128 | } | |
129 | } | |
f1000898 | 130 | |
ebcb5d16 SP |
131 | int run_command(struct child_process *cmd) |
132 | { | |
133 | int code = start_command(cmd); | |
134 | if (code) | |
135 | return code; | |
136 | return finish_command(cmd); | |
137 | } | |
138 | ||
1568fea0 AR |
139 | static void prepare_run_command_v_opt(struct child_process *cmd, |
140 | const char **argv, int opt) | |
141 | { | |
142 | memset(cmd, 0, sizeof(*cmd)); | |
143 | cmd->argv = argv; | |
144 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
145 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
146 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
147 | } | |
148 | ||
f1000898 SP |
149 | int run_command_v_opt(const char **argv, int opt) |
150 | { | |
151 | struct child_process cmd; | |
1568fea0 AR |
152 | prepare_run_command_v_opt(&cmd, argv, opt); |
153 | return run_command(&cmd); | |
154 | } | |
155 | ||
156 | int run_command_v_opt_cd(const char **argv, int opt, const char *dir) | |
157 | { | |
158 | struct child_process cmd; | |
159 | prepare_run_command_v_opt(&cmd, argv, opt); | |
160 | cmd.dir = dir; | |
f1000898 SP |
161 | return run_command(&cmd); |
162 | } |