Prevent case sensitive commit
[git/jr.git] / run-command.c
blob476d00c2182e3af82a0cfe495c61c9df1eb44d26
1 #include "cache.h"
2 #include "run-command.h"
3 #include "exec_cmd.h"
5 static inline void close_pair(int fd[2])
7 close(fd[0]);
8 close(fd[1]);
11 static inline void dup_devnull(int to)
13 int fd = open("/dev/null", O_RDWR);
14 dup2(fd, to);
15 close(fd);
18 int start_command(struct child_process *cmd)
20 int need_in, need_out, need_err;
21 int fdin[2], fdout[2], fderr[2];
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;
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;
40 cmd->out = fdout[0];
41 cmd->close_out = 1;
44 need_err = !cmd->no_stderr && 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;
53 cmd->err = fderr[0];
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;
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);
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);
90 if (cmd->no_stderr)
91 dup_devnull(2);
92 else if (need_err) {
93 dup2(fderr[1], 2);
94 close_pair(fderr);
97 if (cmd->dir && chdir(cmd->dir))
98 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
99 cmd->dir, strerror(errno));
100 if (cmd->env) {
101 for (; *cmd->env; cmd->env++) {
102 if (strchr(*cmd->env, '='))
103 putenv((char*)*cmd->env);
104 else
105 unsetenv(*cmd->env);
108 if (cmd->git_cmd) {
109 execv_git_cmd(cmd->argv);
110 } else {
111 execvp(cmd->argv[0], (char *const*) cmd->argv);
113 die("exec %s failed.", cmd->argv[0]);
116 if (need_in)
117 close(fdin[0]);
118 else if (cmd->in)
119 close(cmd->in);
121 if (need_out)
122 close(fdout[1]);
123 else if (cmd->out > 1)
124 close(cmd->out);
126 if (need_err)
127 close(fderr[1]);
129 return 0;
132 static int wait_or_whine(pid_t pid)
134 for (;;) {
135 int status, code;
136 pid_t waiting = waitpid(pid, &status, 0);
138 if (waiting < 0) {
139 if (errno == EINTR)
140 continue;
141 error("waitpid failed (%s)", strerror(errno));
142 return -ERR_RUN_COMMAND_WAITPID;
144 if (waiting != pid)
145 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
146 if (WIFSIGNALED(status))
147 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
149 if (!WIFEXITED(status))
150 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
151 code = WEXITSTATUS(status);
152 if (code)
153 return -code;
154 return 0;
158 int finish_command(struct child_process *cmd)
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);
167 int run_command(struct child_process *cmd)
169 int code = start_command(cmd);
170 if (code)
171 return code;
172 return finish_command(cmd);
175 static void prepare_run_command_v_opt(struct child_process *cmd,
176 const char **argv,
177 int opt)
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;
186 int run_command_v_opt(const char **argv, int opt)
188 struct child_process cmd;
189 prepare_run_command_v_opt(&cmd, argv, opt);
190 return run_command(&cmd);
193 int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
195 struct child_process cmd;
196 prepare_run_command_v_opt(&cmd, argv, opt);
197 cmd.dir = dir;
198 return run_command(&cmd);
201 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
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);
210 int start_async(struct async *async)
212 int pipe_out[2];
214 if (pipe(pipe_out) < 0)
215 return error("cannot create pipe: %s", strerror(errno));
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;
223 if (!async->pid) {
224 close(pipe_out[0]);
225 exit(!!async->proc(pipe_out[1], async->data));
227 async->out = pipe_out[0];
228 close(pipe_out[1]);
229 return 0;
232 int finish_async(struct async *async)
234 int ret = 0;
236 if (wait_or_whine(async->pid))
237 ret = error("waitpid (async) failed");
238 return ret;