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Diffstat (limited to 'third_party/git/run-command.h')
| -rw-r--r-- | third_party/git/run-command.h | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/third_party/git/run-command.h b/third_party/git/run-command.h new file mode 100644 index 000000000000..f769e03f018f --- /dev/null +++ b/third_party/git/run-command.h @@ -0,0 +1,235 @@ +#ifndef RUN_COMMAND_H +#define RUN_COMMAND_H + +#include "thread-utils.h" + +#include "argv-array.h" + +struct child_process { + const char **argv; + struct argv_array args; + struct argv_array env_array; + pid_t pid; + + int trace2_child_id; + uint64_t trace2_child_us_start; + const char *trace2_child_class; + const char *trace2_hook_name; + + /* + * Using .in, .out, .err: + * - Specify 0 for no redirections (child inherits stdin, stdout, + * stderr from parent). + * - Specify -1 to have a pipe allocated as follows: + * .in: returns the writable pipe end; parent writes to it, + * the readable pipe end becomes child's stdin + * .out, .err: returns the readable pipe end; parent reads from + * it, the writable pipe end becomes child's stdout/stderr + * The caller of start_command() must close the returned FDs + * after it has completed reading from/writing to it! + * - Specify > 0 to set a channel to a particular FD as follows: + * .in: a readable FD, becomes child's stdin + * .out: a writable FD, becomes child's stdout/stderr + * .err: a writable FD, becomes child's stderr + * The specified FD is closed by start_command(), even in case + * of errors! + */ + int in; + int out; + int err; + const char *dir; + const char *const *env; + unsigned no_stdin:1; + unsigned no_stdout:1; + unsigned no_stderr:1; + unsigned git_cmd:1; /* if this is to be git sub-command */ + unsigned silent_exec_failure:1; + unsigned stdout_to_stderr:1; + unsigned use_shell:1; + unsigned clean_on_exit:1; + unsigned wait_after_clean:1; + void (*clean_on_exit_handler)(struct child_process *process); + void *clean_on_exit_handler_cbdata; +}; + +#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT } +void child_process_init(struct child_process *); +void child_process_clear(struct child_process *); +int is_executable(const char *name); + +int start_command(struct child_process *); +int finish_command(struct child_process *); +int finish_command_in_signal(struct child_process *); +int run_command(struct child_process *); + +/* + * Returns the path to the hook file, or NULL if the hook is missing + * or disabled. Note that this points to static storage that will be + * overwritten by further calls to find_hook and run_hook_*. + */ +const char *find_hook(const char *name); +LAST_ARG_MUST_BE_NULL +int run_hook_le(const char *const *env, const char *name, ...); +int run_hook_ve(const char *const *env, const char *name, va_list args); + +#define RUN_COMMAND_NO_STDIN 1 +#define RUN_GIT_CMD 2 /*If this is to be git sub-command */ +#define RUN_COMMAND_STDOUT_TO_STDERR 4 +#define RUN_SILENT_EXEC_FAILURE 8 +#define RUN_USING_SHELL 16 +#define RUN_CLEAN_ON_EXIT 32 +int run_command_v_opt(const char **argv, int opt); +int run_command_v_opt_tr2(const char **argv, int opt, const char *tr2_class); +/* + * env (the environment) is to be formatted like environ: "VAR=VALUE". + * To unset an environment variable use just "VAR". + */ +int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); +int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir, + const char *const *env, const char *tr2_class); + +/** + * Execute the given command, sending "in" to its stdin, and capturing its + * stdout and stderr in the "out" and "err" strbufs. Any of the three may + * be NULL to skip processing. + * + * Returns -1 if starting the command fails or reading fails, and otherwise + * returns the exit code of the command. Any output collected in the + * buffers is kept even if the command returns a non-zero exit. The hint fields + * gives starting sizes for the strbuf allocations. + * + * The fields of "cmd" should be set up as they would for a normal run_command + * invocation. But note that there is no need to set the in, out, or err + * fields; pipe_command handles that automatically. + */ +int pipe_command(struct child_process *cmd, + const char *in, size_t in_len, + struct strbuf *out, size_t out_hint, + struct strbuf *err, size_t err_hint); + +/** + * Convenience wrapper around pipe_command for the common case + * of capturing only stdout. + */ +static inline int capture_command(struct child_process *cmd, + struct strbuf *out, + size_t hint) +{ + return pipe_command(cmd, NULL, 0, out, hint, NULL, 0); +} + +/* + * The purpose of the following functions is to feed a pipe by running + * a function asynchronously and providing output that the caller reads. + * + * It is expected that no synchronization and mutual exclusion between + * the caller and the feed function is necessary so that the function + * can run in a thread without interfering with the caller. + */ +struct async { + /* + * proc reads from in; closes it before return + * proc writes to out; closes it before return + * returns 0 on success, non-zero on failure + */ + int (*proc)(int in, int out, void *data); + void *data; + int in; /* caller writes here and closes it */ + int out; /* caller reads from here and closes it */ +#ifdef NO_PTHREADS + pid_t pid; +#else + pthread_t tid; + int proc_in; + int proc_out; +#endif + int isolate_sigpipe; +}; + +int start_async(struct async *async); +int finish_async(struct async *async); +int in_async(void); +int async_with_fork(void); +void check_pipe(int err); + +/** + * This callback should initialize the child process and preload the + * error channel if desired. The preloading of is useful if you want to + * have a message printed directly before the output of the child process. + * pp_cb is the callback cookie as passed to run_processes_parallel. + * You can store a child process specific callback cookie in pp_task_cb. + * + * Even after returning 0 to indicate that there are no more processes, + * this function will be called again until there are no more running + * child processes. + * + * Return 1 if the next child is ready to run. + * Return 0 if there are currently no more tasks to be processed. + * To send a signal to other child processes for abortion, + * return the negative signal number. + */ +typedef int (*get_next_task_fn)(struct child_process *cp, + struct strbuf *out, + void *pp_cb, + void **pp_task_cb); + +/** + * This callback is called whenever there are problems starting + * a new process. + * + * You must not write to stdout or stderr in this function. Add your + * message to the strbuf out instead, which will be printed without + * messing up the output of the other parallel processes. + * + * pp_cb is the callback cookie as passed into run_processes_parallel, + * pp_task_cb is the callback cookie as passed into get_next_task_fn. + * + * Return 0 to continue the parallel processing. To abort return non zero. + * To send a signal to other child processes for abortion, return + * the negative signal number. + */ +typedef int (*start_failure_fn)(struct strbuf *out, + void *pp_cb, + void *pp_task_cb); + +/** + * This callback is called on every child process that finished processing. + * + * You must not write to stdout or stderr in this function. Add your + * message to the strbuf out instead, which will be printed without + * messing up the output of the other parallel processes. + * + * pp_cb is the callback cookie as passed into run_processes_parallel, + * pp_task_cb is the callback cookie as passed into get_next_task_fn. + * + * Return 0 to continue the parallel processing. To abort return non zero. + * To send a signal to other child processes for abortion, return + * the negative signal number. + */ +typedef int (*task_finished_fn)(int result, + struct strbuf *out, + void *pp_cb, + void *pp_task_cb); + +/** + * Runs up to n processes at the same time. Whenever a process can be + * started, the callback get_next_task_fn is called to obtain the data + * required to start another child process. + * + * The children started via this function run in parallel. Their output + * (both stdout and stderr) is routed to stderr in a manner that output + * from different tasks does not interleave. + * + * start_failure_fn and task_finished_fn can be NULL to omit any + * special handling. + */ +int run_processes_parallel(int n, + get_next_task_fn, + start_failure_fn, + task_finished_fn, + void *pp_cb); +int run_processes_parallel_tr2(int n, get_next_task_fn, start_failure_fn, + task_finished_fn, void *pp_cb, + const char *tr2_category, const char *tr2_label); + +#endif |