apply.h: include missing header
[git/git.git] / run-command.h
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1#ifndef RUN_COMMAND_H
2#define RUN_COMMAND_H
3
10bc232d 4#include "thread-utils.h"
200a76b7 5
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6#include "argv-array.h"
7
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8struct child_process {
9 const char **argv;
c460c0ec 10 struct argv_array args;
19a583dc 11 struct argv_array env_array;
ebcb5d16 12 pid_t pid;
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13
14 int trace2_child_id;
15 uint64_t trace2_child_us_start;
16 const char *trace2_child_class;
17 const char *trace2_hook_name;
18
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19 /*
20 * Using .in, .out, .err:
21 * - Specify 0 for no redirections (child inherits stdin, stdout,
22 * stderr from parent).
23 * - Specify -1 to have a pipe allocated as follows:
24 * .in: returns the writable pipe end; parent writes to it,
25 * the readable pipe end becomes child's stdin
26 * .out, .err: returns the readable pipe end; parent reads from
27 * it, the writable pipe end becomes child's stdout/stderr
28 * The caller of start_command() must close the returned FDs
29 * after it has completed reading from/writing to it!
30 * - Specify > 0 to set a channel to a particular FD as follows:
31 * .in: a readable FD, becomes child's stdin
32 * .out: a writable FD, becomes child's stdout/stderr
4f41b611 33 * .err: a writable FD, becomes child's stderr
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34 * The specified FD is closed by start_command(), even in case
35 * of errors!
36 */
4919bf03 37 int in;
f4bba25b 38 int out;
f3b33f1d 39 int err;
1568fea0 40 const char *dir;
ee493148 41 const char *const *env;
f1000898 42 unsigned no_stdin:1;
e4507ae8 43 unsigned no_stdout:1;
b73a4397 44 unsigned no_stderr:1;
f1000898 45 unsigned git_cmd:1; /* if this is to be git sub-command */
c024beb5 46 unsigned silent_exec_failure:1;
f1000898 47 unsigned stdout_to_stderr:1;
8dba1e63 48 unsigned use_shell:1;
afe19ff7 49 unsigned clean_on_exit:1;
46df6906 50 unsigned wait_after_clean:1;
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51 void (*clean_on_exit_handler)(struct child_process *process);
52 void *clean_on_exit_handler_cbdata;
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53};
54
19a583dc 55#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
483bbd4e 56void child_process_init(struct child_process *);
2d71608e 57void child_process_clear(struct child_process *);
55454427 58int is_executable(const char *name);
d3180279 59
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60int start_command(struct child_process *);
61int finish_command(struct child_process *);
507d7804 62int finish_command_in_signal(struct child_process *);
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63int run_command(struct child_process *);
64
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65/*
66 * Returns the path to the hook file, or NULL if the hook is missing
67 * or disabled. Note that this points to static storage that will be
68 * overwritten by further calls to find_hook and run_hook_*.
69 */
55454427 70const char *find_hook(const char *name);
9fe3edc4 71LAST_ARG_MUST_BE_NULL
b199d714 72int run_hook_le(const char *const *env, const char *name, ...);
55454427 73int run_hook_ve(const char *const *env, const char *name, va_list args);
15048f8a 74
95d3c4f5 75#define RUN_COMMAND_NO_STDIN 1
77cb17e9 76#define RUN_GIT_CMD 2 /*If this is to be git sub-command */
cd83c74c 77#define RUN_COMMAND_STDOUT_TO_STDERR 4
c024beb5 78#define RUN_SILENT_EXEC_FAILURE 8
8dba1e63 79#define RUN_USING_SHELL 16
10c6cddd 80#define RUN_CLEAN_ON_EXIT 32
9b0b5093 81int run_command_v_opt(const char **argv, int opt);
ee4512ed 82int run_command_v_opt_tr2(const char **argv, int opt, const char *tr2_class);
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83/*
84 * env (the environment) is to be formatted like environ: "VAR=VALUE".
85 * To unset an environment variable use just "VAR".
86 */
ee493148 87int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
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88int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir,
89 const char *const *env, const char *tr2_class);
b1bf95bb 90
911ec99b 91/**
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92 * Execute the given command, sending "in" to its stdin, and capturing its
93 * stdout and stderr in the "out" and "err" strbufs. Any of the three may
94 * be NULL to skip processing.
95 *
911ec99b 96 * Returns -1 if starting the command fails or reading fails, and otherwise
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97 * returns the exit code of the command. Any output collected in the
98 * buffers is kept even if the command returns a non-zero exit. The hint fields
99 * gives starting sizes for the strbuf allocations.
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100 *
101 * The fields of "cmd" should be set up as they would for a normal run_command
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102 * invocation. But note that there is no need to set the in, out, or err
103 * fields; pipe_command handles that automatically.
104 */
105int pipe_command(struct child_process *cmd,
106 const char *in, size_t in_len,
107 struct strbuf *out, size_t out_hint,
108 struct strbuf *err, size_t err_hint);
109
110/**
111 * Convenience wrapper around pipe_command for the common case
112 * of capturing only stdout.
911ec99b 113 */
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114static inline int capture_command(struct child_process *cmd,
115 struct strbuf *out,
116 size_t hint)
117{
118 return pipe_command(cmd, NULL, 0, out, hint, NULL, 0);
119}
911ec99b 120
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121/*
122 * The purpose of the following functions is to feed a pipe by running
123 * a function asynchronously and providing output that the caller reads.
124 *
125 * It is expected that no synchronization and mutual exclusion between
126 * the caller and the feed function is necessary so that the function
127 * can run in a thread without interfering with the caller.
128 */
129struct async {
130 /*
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131 * proc reads from in; closes it before return
132 * proc writes to out; closes it before return
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133 * returns 0 on success, non-zero on failure
134 */
ae6a5609 135 int (*proc)(int in, int out, void *data);
2d22c208 136 void *data;
ae6a5609 137 int in; /* caller writes here and closes it */
2d22c208 138 int out; /* caller reads from here and closes it */
f6b60983 139#ifdef NO_PTHREADS
2d22c208 140 pid_t pid;
618ebe9f 141#else
200a76b7 142 pthread_t tid;
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143 int proc_in;
144 int proc_out;
618ebe9f 145#endif
c792d7b6 146 int isolate_sigpipe;
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147};
148
149int start_async(struct async *async);
150int finish_async(struct async *async);
661a8cf4 151int in_async(void);
c0e40a2d 152int async_with_fork(void);
b992fe10 153void check_pipe(int err);
2d22c208 154
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155/**
156 * This callback should initialize the child process and preload the
157 * error channel if desired. The preloading of is useful if you want to
158 * have a message printed directly before the output of the child process.
159 * pp_cb is the callback cookie as passed to run_processes_parallel.
160 * You can store a child process specific callback cookie in pp_task_cb.
161 *
162 * Even after returning 0 to indicate that there are no more processes,
163 * this function will be called again until there are no more running
164 * child processes.
165 *
166 * Return 1 if the next child is ready to run.
167 * Return 0 if there are currently no more tasks to be processed.
168 * To send a signal to other child processes for abortion,
169 * return the negative signal number.
170 */
171typedef int (*get_next_task_fn)(struct child_process *cp,
aa710494 172 struct strbuf *out,
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173 void *pp_cb,
174 void **pp_task_cb);
175
176/**
177 * This callback is called whenever there are problems starting
178 * a new process.
179 *
180 * You must not write to stdout or stderr in this function. Add your
aa710494 181 * message to the strbuf out instead, which will be printed without
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182 * messing up the output of the other parallel processes.
183 *
184 * pp_cb is the callback cookie as passed into run_processes_parallel,
185 * pp_task_cb is the callback cookie as passed into get_next_task_fn.
186 *
187 * Return 0 to continue the parallel processing. To abort return non zero.
188 * To send a signal to other child processes for abortion, return
189 * the negative signal number.
190 */
aa710494 191typedef int (*start_failure_fn)(struct strbuf *out,
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192 void *pp_cb,
193 void *pp_task_cb);
194
195/**
196 * This callback is called on every child process that finished processing.
197 *
198 * You must not write to stdout or stderr in this function. Add your
aa710494 199 * message to the strbuf out instead, which will be printed without
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200 * messing up the output of the other parallel processes.
201 *
202 * pp_cb is the callback cookie as passed into run_processes_parallel,
203 * pp_task_cb is the callback cookie as passed into get_next_task_fn.
204 *
205 * Return 0 to continue the parallel processing. To abort return non zero.
206 * To send a signal to other child processes for abortion, return
207 * the negative signal number.
208 */
209typedef int (*task_finished_fn)(int result,
aa710494 210 struct strbuf *out,
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211 void *pp_cb,
212 void *pp_task_cb);
213
214/**
215 * Runs up to n processes at the same time. Whenever a process can be
216 * started, the callback get_next_task_fn is called to obtain the data
217 * required to start another child process.
218 *
219 * The children started via this function run in parallel. Their output
220 * (both stdout and stderr) is routed to stderr in a manner that output
221 * from different tasks does not interleave.
222 *
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223 * start_failure_fn and task_finished_fn can be NULL to omit any
224 * special handling.
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225 */
226int run_processes_parallel(int n,
227 get_next_task_fn,
228 start_failure_fn,
229 task_finished_fn,
230 void *pp_cb);
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231int run_processes_parallel_tr2(int n, get_next_task_fn, start_failure_fn,
232 task_finished_fn, void *pp_cb,
233 const char *tr2_category, const char *tr2_label);
c553c72e 234
b1bf95bb 235#endif