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https://github.com/git/git
synced 2024-08-27 03:29:21 +00:00
![René Scharfe](/assets/img/avatar_default.png)
Add and apply a semantic patch for converting code that open-codes CALLOC_ARRAY to use it instead. It shortens the code and infers the element size automatically. Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1895 lines
41 KiB
C
1895 lines
41 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "exec-cmd.h"
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#include "sigchain.h"
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#include "strvec.h"
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#include "thread-utils.h"
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#include "strbuf.h"
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#include "string-list.h"
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#include "quote.h"
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#include "config.h"
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void child_process_init(struct child_process *child)
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{
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memset(child, 0, sizeof(*child));
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strvec_init(&child->args);
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strvec_init(&child->env_array);
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}
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void child_process_clear(struct child_process *child)
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{
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strvec_clear(&child->args);
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strvec_clear(&child->env_array);
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}
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struct child_to_clean {
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pid_t pid;
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struct child_process *process;
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struct child_to_clean *next;
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};
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static struct child_to_clean *children_to_clean;
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static int installed_child_cleanup_handler;
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static void cleanup_children(int sig, int in_signal)
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{
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struct child_to_clean *children_to_wait_for = NULL;
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while (children_to_clean) {
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struct child_to_clean *p = children_to_clean;
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children_to_clean = p->next;
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if (p->process && !in_signal) {
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struct child_process *process = p->process;
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if (process->clean_on_exit_handler) {
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trace_printf(
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"trace: run_command: running exit handler for pid %"
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PRIuMAX, (uintmax_t)p->pid
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);
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process->clean_on_exit_handler(process);
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}
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}
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kill(p->pid, sig);
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if (p->process && p->process->wait_after_clean) {
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p->next = children_to_wait_for;
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children_to_wait_for = p;
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} else {
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if (!in_signal)
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free(p);
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}
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}
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while (children_to_wait_for) {
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struct child_to_clean *p = children_to_wait_for;
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children_to_wait_for = p->next;
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while (waitpid(p->pid, NULL, 0) < 0 && errno == EINTR)
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; /* spin waiting for process exit or error */
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if (!in_signal)
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free(p);
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}
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}
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static void cleanup_children_on_signal(int sig)
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{
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cleanup_children(sig, 1);
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sigchain_pop(sig);
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raise(sig);
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}
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static void cleanup_children_on_exit(void)
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{
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cleanup_children(SIGTERM, 0);
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}
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static void mark_child_for_cleanup(pid_t pid, struct child_process *process)
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{
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struct child_to_clean *p = xmalloc(sizeof(*p));
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p->pid = pid;
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p->process = process;
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p->next = children_to_clean;
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children_to_clean = p;
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if (!installed_child_cleanup_handler) {
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atexit(cleanup_children_on_exit);
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sigchain_push_common(cleanup_children_on_signal);
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installed_child_cleanup_handler = 1;
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}
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}
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static void clear_child_for_cleanup(pid_t pid)
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{
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struct child_to_clean **pp;
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for (pp = &children_to_clean; *pp; pp = &(*pp)->next) {
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struct child_to_clean *clean_me = *pp;
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if (clean_me->pid == pid) {
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*pp = clean_me->next;
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free(clean_me);
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return;
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}
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}
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}
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static inline void close_pair(int fd[2])
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{
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close(fd[0]);
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close(fd[1]);
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}
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int is_executable(const char *name)
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{
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struct stat st;
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if (stat(name, &st) || /* stat, not lstat */
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!S_ISREG(st.st_mode))
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return 0;
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#if defined(GIT_WINDOWS_NATIVE)
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/*
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* On Windows there is no executable bit. The file extension
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* indicates whether it can be run as an executable, and Git
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* has special-handling to detect scripts and launch them
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* through the indicated script interpreter. We test for the
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* file extension first because virus scanners may make
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* it quite expensive to open many files.
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*/
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if (ends_with(name, ".exe"))
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return S_IXUSR;
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{
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/*
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* Now that we know it does not have an executable extension,
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* peek into the file instead.
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*/
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char buf[3] = { 0 };
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int n;
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int fd = open(name, O_RDONLY);
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st.st_mode &= ~S_IXUSR;
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if (fd >= 0) {
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n = read(fd, buf, 2);
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if (n == 2)
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/* look for a she-bang */
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if (!strcmp(buf, "#!"))
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st.st_mode |= S_IXUSR;
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close(fd);
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}
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}
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#endif
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return st.st_mode & S_IXUSR;
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}
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/*
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* Search $PATH for a command. This emulates the path search that
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* execvp would perform, without actually executing the command so it
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* can be used before fork() to prepare to run a command using
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* execve() or after execvp() to diagnose why it failed.
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*
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* The caller should ensure that file contains no directory
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* separators.
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*
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* Returns the path to the command, as found in $PATH or NULL if the
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* command could not be found. The caller inherits ownership of the memory
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* used to store the resultant path.
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*
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* This should not be used on Windows, where the $PATH search rules
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* are more complicated (e.g., a search for "foo" should find
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* "foo.exe").
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*/
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static char *locate_in_PATH(const char *file)
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{
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const char *p = getenv("PATH");
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struct strbuf buf = STRBUF_INIT;
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if (!p || !*p)
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return NULL;
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while (1) {
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const char *end = strchrnul(p, ':');
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strbuf_reset(&buf);
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/* POSIX specifies an empty entry as the current directory. */
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if (end != p) {
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strbuf_add(&buf, p, end - p);
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strbuf_addch(&buf, '/');
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}
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strbuf_addstr(&buf, file);
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if (is_executable(buf.buf))
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return strbuf_detach(&buf, NULL);
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if (!*end)
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break;
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p = end + 1;
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}
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strbuf_release(&buf);
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return NULL;
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}
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static int exists_in_PATH(const char *file)
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{
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char *r = locate_in_PATH(file);
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int found = r != NULL;
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free(r);
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return found;
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}
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int sane_execvp(const char *file, char * const argv[])
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{
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#ifndef GIT_WINDOWS_NATIVE
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/*
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* execvp() doesn't return, so we all we can do is tell trace2
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* what we are about to do and let it leave a hint in the log
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* (unless of course the execvp() fails).
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*
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* we skip this for Windows because the compat layer already
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* has to emulate the execvp() call anyway.
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*/
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int exec_id = trace2_exec(file, (const char **)argv);
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#endif
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if (!execvp(file, argv))
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return 0; /* cannot happen ;-) */
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#ifndef GIT_WINDOWS_NATIVE
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{
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int ec = errno;
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trace2_exec_result(exec_id, ec);
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errno = ec;
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}
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#endif
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/*
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* When a command can't be found because one of the directories
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* listed in $PATH is unsearchable, execvp reports EACCES, but
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* careful usability testing (read: analysis of occasional bug
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* reports) reveals that "No such file or directory" is more
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* intuitive.
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*
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* We avoid commands with "/", because execvp will not do $PATH
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* lookups in that case.
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*
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* The reassignment of EACCES to errno looks like a no-op below,
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* but we need to protect against exists_in_PATH overwriting errno.
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*/
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if (errno == EACCES && !strchr(file, '/'))
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errno = exists_in_PATH(file) ? EACCES : ENOENT;
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else if (errno == ENOTDIR && !strchr(file, '/'))
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errno = ENOENT;
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return -1;
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}
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static const char **prepare_shell_cmd(struct strvec *out, const char **argv)
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{
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if (!argv[0])
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BUG("shell command is empty");
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if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
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#ifndef GIT_WINDOWS_NATIVE
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strvec_push(out, SHELL_PATH);
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#else
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strvec_push(out, "sh");
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#endif
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strvec_push(out, "-c");
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/*
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* If we have no extra arguments, we do not even need to
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* bother with the "$@" magic.
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*/
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if (!argv[1])
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strvec_push(out, argv[0]);
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else
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strvec_pushf(out, "%s \"$@\"", argv[0]);
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}
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strvec_pushv(out, argv);
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return out->v;
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}
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#ifndef GIT_WINDOWS_NATIVE
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static int child_notifier = -1;
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enum child_errcode {
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CHILD_ERR_CHDIR,
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CHILD_ERR_DUP2,
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CHILD_ERR_CLOSE,
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CHILD_ERR_SIGPROCMASK,
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CHILD_ERR_ENOENT,
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CHILD_ERR_SILENT,
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CHILD_ERR_ERRNO
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};
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struct child_err {
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enum child_errcode err;
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int syserr; /* errno */
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};
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static void child_die(enum child_errcode err)
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{
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struct child_err buf;
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buf.err = err;
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buf.syserr = errno;
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/* write(2) on buf smaller than PIPE_BUF (min 512) is atomic: */
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xwrite(child_notifier, &buf, sizeof(buf));
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_exit(1);
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}
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static void child_dup2(int fd, int to)
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{
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if (dup2(fd, to) < 0)
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child_die(CHILD_ERR_DUP2);
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}
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static void child_close(int fd)
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{
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if (close(fd))
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child_die(CHILD_ERR_CLOSE);
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}
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static void child_close_pair(int fd[2])
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{
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child_close(fd[0]);
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child_close(fd[1]);
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}
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/*
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* parent will make it look like the child spewed a fatal error and died
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* this is needed to prevent changes to t0061.
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*/
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static void fake_fatal(const char *err, va_list params)
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{
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vreportf("fatal: ", err, params);
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}
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static void child_error_fn(const char *err, va_list params)
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{
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const char msg[] = "error() should not be called in child\n";
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xwrite(2, msg, sizeof(msg) - 1);
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}
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static void child_warn_fn(const char *err, va_list params)
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{
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const char msg[] = "warn() should not be called in child\n";
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xwrite(2, msg, sizeof(msg) - 1);
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}
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static void NORETURN child_die_fn(const char *err, va_list params)
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{
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const char msg[] = "die() should not be called in child\n";
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xwrite(2, msg, sizeof(msg) - 1);
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_exit(2);
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}
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/* this runs in the parent process */
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static void child_err_spew(struct child_process *cmd, struct child_err *cerr)
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{
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static void (*old_errfn)(const char *err, va_list params);
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old_errfn = get_error_routine();
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set_error_routine(fake_fatal);
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errno = cerr->syserr;
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switch (cerr->err) {
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case CHILD_ERR_CHDIR:
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error_errno("exec '%s': cd to '%s' failed",
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cmd->argv[0], cmd->dir);
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break;
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case CHILD_ERR_DUP2:
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error_errno("dup2() in child failed");
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break;
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case CHILD_ERR_CLOSE:
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error_errno("close() in child failed");
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break;
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case CHILD_ERR_SIGPROCMASK:
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error_errno("sigprocmask failed restoring signals");
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break;
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case CHILD_ERR_ENOENT:
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error_errno("cannot run %s", cmd->argv[0]);
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break;
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case CHILD_ERR_SILENT:
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break;
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case CHILD_ERR_ERRNO:
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error_errno("cannot exec '%s'", cmd->argv[0]);
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break;
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}
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set_error_routine(old_errfn);
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}
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static int prepare_cmd(struct strvec *out, const struct child_process *cmd)
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{
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if (!cmd->argv[0])
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BUG("command is empty");
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/*
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* Add SHELL_PATH so in the event exec fails with ENOEXEC we can
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* attempt to interpret the command with 'sh'.
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*/
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strvec_push(out, SHELL_PATH);
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if (cmd->git_cmd) {
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prepare_git_cmd(out, cmd->argv);
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} else if (cmd->use_shell) {
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prepare_shell_cmd(out, cmd->argv);
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} else {
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strvec_pushv(out, cmd->argv);
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}
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/*
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* If there are no dir separator characters in the command then perform
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* a path lookup and use the resolved path as the command to exec. If
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* there are dir separator characters, we have exec attempt to invoke
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* the command directly.
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*/
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if (!has_dir_sep(out->v[1])) {
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char *program = locate_in_PATH(out->v[1]);
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if (program) {
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free((char *)out->v[1]);
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out->v[1] = program;
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} else {
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strvec_clear(out);
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errno = ENOENT;
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return -1;
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}
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}
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return 0;
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}
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static char **prep_childenv(const char *const *deltaenv)
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{
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extern char **environ;
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char **childenv;
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struct string_list env = STRING_LIST_INIT_DUP;
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struct strbuf key = STRBUF_INIT;
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const char *const *p;
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int i;
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/* Construct a sorted string list consisting of the current environ */
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for (p = (const char *const *) environ; p && *p; p++) {
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const char *equals = strchr(*p, '=');
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if (equals) {
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strbuf_reset(&key);
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strbuf_add(&key, *p, equals - *p);
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string_list_append(&env, key.buf)->util = (void *) *p;
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} else {
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string_list_append(&env, *p)->util = (void *) *p;
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}
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}
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string_list_sort(&env);
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/* Merge in 'deltaenv' with the current environ */
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for (p = deltaenv; p && *p; p++) {
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const char *equals = strchr(*p, '=');
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if (equals) {
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/* ('key=value'), insert or replace entry */
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strbuf_reset(&key);
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strbuf_add(&key, *p, equals - *p);
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string_list_insert(&env, key.buf)->util = (void *) *p;
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} else {
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/* otherwise ('key') remove existing entry */
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string_list_remove(&env, *p, 0);
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}
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}
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/* Create an array of 'char *' to be used as the childenv */
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ALLOC_ARRAY(childenv, env.nr + 1);
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for (i = 0; i < env.nr; i++)
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childenv[i] = env.items[i].util;
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childenv[env.nr] = NULL;
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string_list_clear(&env, 0);
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strbuf_release(&key);
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return childenv;
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}
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struct atfork_state {
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#ifndef NO_PTHREADS
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int cs;
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#endif
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sigset_t old;
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};
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#define CHECK_BUG(err, msg) \
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do { \
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int e = (err); \
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if (e) \
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BUG("%s: %s", msg, strerror(e)); \
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} while(0)
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|
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static void atfork_prepare(struct atfork_state *as)
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|
{
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|
sigset_t all;
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|
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if (sigfillset(&all))
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die_errno("sigfillset");
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#ifdef NO_PTHREADS
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if (sigprocmask(SIG_SETMASK, &all, &as->old))
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die_errno("sigprocmask");
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#else
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CHECK_BUG(pthread_sigmask(SIG_SETMASK, &all, &as->old),
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"blocking all signals");
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CHECK_BUG(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs),
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"disabling cancellation");
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#endif
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}
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static void atfork_parent(struct atfork_state *as)
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{
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#ifdef NO_PTHREADS
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if (sigprocmask(SIG_SETMASK, &as->old, NULL))
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die_errno("sigprocmask");
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#else
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CHECK_BUG(pthread_setcancelstate(as->cs, NULL),
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"re-enabling cancellation");
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CHECK_BUG(pthread_sigmask(SIG_SETMASK, &as->old, NULL),
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"restoring signal mask");
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#endif
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}
|
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#endif /* GIT_WINDOWS_NATIVE */
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|
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static inline void set_cloexec(int fd)
|
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{
|
|
int flags = fcntl(fd, F_GETFD);
|
|
if (flags >= 0)
|
|
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
|
|
}
|
|
|
|
static int wait_or_whine(pid_t pid, const char *argv0, int in_signal)
|
|
{
|
|
int status, code = -1;
|
|
pid_t waiting;
|
|
int failed_errno = 0;
|
|
|
|
while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
|
|
; /* nothing */
|
|
if (in_signal) {
|
|
if (WIFEXITED(status))
|
|
code = WEXITSTATUS(status);
|
|
return code;
|
|
}
|
|
|
|
if (waiting < 0) {
|
|
failed_errno = errno;
|
|
error_errno("waitpid for %s failed", argv0);
|
|
} else if (waiting != pid) {
|
|
error("waitpid is confused (%s)", argv0);
|
|
} else if (WIFSIGNALED(status)) {
|
|
code = WTERMSIG(status);
|
|
if (code != SIGINT && code != SIGQUIT && code != SIGPIPE)
|
|
error("%s died of signal %d", argv0, code);
|
|
/*
|
|
* This return value is chosen so that code & 0xff
|
|
* mimics the exit code that a POSIX shell would report for
|
|
* a program that died from this signal.
|
|
*/
|
|
code += 128;
|
|
} else if (WIFEXITED(status)) {
|
|
code = WEXITSTATUS(status);
|
|
} else {
|
|
error("waitpid is confused (%s)", argv0);
|
|
}
|
|
|
|
clear_child_for_cleanup(pid);
|
|
|
|
errno = failed_errno;
|
|
return code;
|
|
}
|
|
|
|
static void trace_add_env(struct strbuf *dst, const char *const *deltaenv)
|
|
{
|
|
struct string_list envs = STRING_LIST_INIT_DUP;
|
|
const char *const *e;
|
|
int i;
|
|
int printed_unset = 0;
|
|
|
|
/* Last one wins, see run-command.c:prep_childenv() for context */
|
|
for (e = deltaenv; e && *e; e++) {
|
|
struct strbuf key = STRBUF_INIT;
|
|
char *equals = strchr(*e, '=');
|
|
|
|
if (equals) {
|
|
strbuf_add(&key, *e, equals - *e);
|
|
string_list_insert(&envs, key.buf)->util = equals + 1;
|
|
} else {
|
|
string_list_insert(&envs, *e)->util = NULL;
|
|
}
|
|
strbuf_release(&key);
|
|
}
|
|
|
|
/* "unset X Y...;" */
|
|
for (i = 0; i < envs.nr; i++) {
|
|
const char *var = envs.items[i].string;
|
|
const char *val = envs.items[i].util;
|
|
|
|
if (val || !getenv(var))
|
|
continue;
|
|
|
|
if (!printed_unset) {
|
|
strbuf_addstr(dst, " unset");
|
|
printed_unset = 1;
|
|
}
|
|
strbuf_addf(dst, " %s", var);
|
|
}
|
|
if (printed_unset)
|
|
strbuf_addch(dst, ';');
|
|
|
|
/* ... followed by "A=B C=D ..." */
|
|
for (i = 0; i < envs.nr; i++) {
|
|
const char *var = envs.items[i].string;
|
|
const char *val = envs.items[i].util;
|
|
const char *oldval;
|
|
|
|
if (!val)
|
|
continue;
|
|
|
|
oldval = getenv(var);
|
|
if (oldval && !strcmp(val, oldval))
|
|
continue;
|
|
|
|
strbuf_addf(dst, " %s=", var);
|
|
sq_quote_buf_pretty(dst, val);
|
|
}
|
|
string_list_clear(&envs, 0);
|
|
}
|
|
|
|
static void trace_run_command(const struct child_process *cp)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
if (!trace_want(&trace_default_key))
|
|
return;
|
|
|
|
strbuf_addstr(&buf, "trace: run_command:");
|
|
if (cp->dir) {
|
|
strbuf_addstr(&buf, " cd ");
|
|
sq_quote_buf_pretty(&buf, cp->dir);
|
|
strbuf_addch(&buf, ';');
|
|
}
|
|
/*
|
|
* The caller is responsible for initializing cp->env from
|
|
* cp->env_array if needed. We only check one place.
|
|
*/
|
|
if (cp->env)
|
|
trace_add_env(&buf, cp->env);
|
|
if (cp->git_cmd)
|
|
strbuf_addstr(&buf, " git");
|
|
sq_quote_argv_pretty(&buf, cp->argv);
|
|
|
|
trace_printf("%s", buf.buf);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
int start_command(struct child_process *cmd)
|
|
{
|
|
int need_in, need_out, need_err;
|
|
int fdin[2], fdout[2], fderr[2];
|
|
int failed_errno;
|
|
char *str;
|
|
|
|
if (!cmd->argv)
|
|
cmd->argv = cmd->args.v;
|
|
if (!cmd->env)
|
|
cmd->env = cmd->env_array.v;
|
|
|
|
/*
|
|
* In case of errors we must keep the promise to close FDs
|
|
* that have been passed in via ->in and ->out.
|
|
*/
|
|
|
|
need_in = !cmd->no_stdin && cmd->in < 0;
|
|
if (need_in) {
|
|
if (pipe(fdin) < 0) {
|
|
failed_errno = errno;
|
|
if (cmd->out > 0)
|
|
close(cmd->out);
|
|
str = "standard input";
|
|
goto fail_pipe;
|
|
}
|
|
cmd->in = fdin[1];
|
|
}
|
|
|
|
need_out = !cmd->no_stdout
|
|
&& !cmd->stdout_to_stderr
|
|
&& cmd->out < 0;
|
|
if (need_out) {
|
|
if (pipe(fdout) < 0) {
|
|
failed_errno = errno;
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
str = "standard output";
|
|
goto fail_pipe;
|
|
}
|
|
cmd->out = fdout[0];
|
|
}
|
|
|
|
need_err = !cmd->no_stderr && cmd->err < 0;
|
|
if (need_err) {
|
|
if (pipe(fderr) < 0) {
|
|
failed_errno = errno;
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
if (need_out)
|
|
close_pair(fdout);
|
|
else if (cmd->out)
|
|
close(cmd->out);
|
|
str = "standard error";
|
|
fail_pipe:
|
|
error("cannot create %s pipe for %s: %s",
|
|
str, cmd->argv[0], strerror(failed_errno));
|
|
child_process_clear(cmd);
|
|
errno = failed_errno;
|
|
return -1;
|
|
}
|
|
cmd->err = fderr[0];
|
|
}
|
|
|
|
trace2_child_start(cmd);
|
|
trace_run_command(cmd);
|
|
|
|
fflush(NULL);
|
|
|
|
#ifndef GIT_WINDOWS_NATIVE
|
|
{
|
|
int notify_pipe[2];
|
|
int null_fd = -1;
|
|
char **childenv;
|
|
struct strvec argv = STRVEC_INIT;
|
|
struct child_err cerr;
|
|
struct atfork_state as;
|
|
|
|
if (prepare_cmd(&argv, cmd) < 0) {
|
|
failed_errno = errno;
|
|
cmd->pid = -1;
|
|
if (!cmd->silent_exec_failure)
|
|
error_errno("cannot run %s", cmd->argv[0]);
|
|
goto end_of_spawn;
|
|
}
|
|
|
|
if (pipe(notify_pipe))
|
|
notify_pipe[0] = notify_pipe[1] = -1;
|
|
|
|
if (cmd->no_stdin || cmd->no_stdout || cmd->no_stderr) {
|
|
null_fd = open("/dev/null", O_RDWR | O_CLOEXEC);
|
|
if (null_fd < 0)
|
|
die_errno(_("open /dev/null failed"));
|
|
set_cloexec(null_fd);
|
|
}
|
|
|
|
childenv = prep_childenv(cmd->env);
|
|
atfork_prepare(&as);
|
|
|
|
/*
|
|
* NOTE: In order to prevent deadlocking when using threads special
|
|
* care should be taken with the function calls made in between the
|
|
* fork() and exec() calls. No calls should be made to functions which
|
|
* require acquiring a lock (e.g. malloc) as the lock could have been
|
|
* held by another thread at the time of forking, causing the lock to
|
|
* never be released in the child process. This means only
|
|
* Async-Signal-Safe functions are permitted in the child.
|
|
*/
|
|
cmd->pid = fork();
|
|
failed_errno = errno;
|
|
if (!cmd->pid) {
|
|
int sig;
|
|
/*
|
|
* Ensure the default die/error/warn routines do not get
|
|
* called, they can take stdio locks and malloc.
|
|
*/
|
|
set_die_routine(child_die_fn);
|
|
set_error_routine(child_error_fn);
|
|
set_warn_routine(child_warn_fn);
|
|
|
|
close(notify_pipe[0]);
|
|
set_cloexec(notify_pipe[1]);
|
|
child_notifier = notify_pipe[1];
|
|
|
|
if (cmd->no_stdin)
|
|
child_dup2(null_fd, 0);
|
|
else if (need_in) {
|
|
child_dup2(fdin[0], 0);
|
|
child_close_pair(fdin);
|
|
} else if (cmd->in) {
|
|
child_dup2(cmd->in, 0);
|
|
child_close(cmd->in);
|
|
}
|
|
|
|
if (cmd->no_stderr)
|
|
child_dup2(null_fd, 2);
|
|
else if (need_err) {
|
|
child_dup2(fderr[1], 2);
|
|
child_close_pair(fderr);
|
|
} else if (cmd->err > 1) {
|
|
child_dup2(cmd->err, 2);
|
|
child_close(cmd->err);
|
|
}
|
|
|
|
if (cmd->no_stdout)
|
|
child_dup2(null_fd, 1);
|
|
else if (cmd->stdout_to_stderr)
|
|
child_dup2(2, 1);
|
|
else if (need_out) {
|
|
child_dup2(fdout[1], 1);
|
|
child_close_pair(fdout);
|
|
} else if (cmd->out > 1) {
|
|
child_dup2(cmd->out, 1);
|
|
child_close(cmd->out);
|
|
}
|
|
|
|
if (cmd->dir && chdir(cmd->dir))
|
|
child_die(CHILD_ERR_CHDIR);
|
|
|
|
/*
|
|
* restore default signal handlers here, in case
|
|
* we catch a signal right before execve below
|
|
*/
|
|
for (sig = 1; sig < NSIG; sig++) {
|
|
/* ignored signals get reset to SIG_DFL on execve */
|
|
if (signal(sig, SIG_DFL) == SIG_IGN)
|
|
signal(sig, SIG_IGN);
|
|
}
|
|
|
|
if (sigprocmask(SIG_SETMASK, &as.old, NULL) != 0)
|
|
child_die(CHILD_ERR_SIGPROCMASK);
|
|
|
|
/*
|
|
* Attempt to exec using the command and arguments starting at
|
|
* argv.argv[1]. argv.argv[0] contains SHELL_PATH which will
|
|
* be used in the event exec failed with ENOEXEC at which point
|
|
* we will try to interpret the command using 'sh'.
|
|
*/
|
|
execve(argv.v[1], (char *const *) argv.v + 1,
|
|
(char *const *) childenv);
|
|
if (errno == ENOEXEC)
|
|
execve(argv.v[0], (char *const *) argv.v,
|
|
(char *const *) childenv);
|
|
|
|
if (errno == ENOENT) {
|
|
if (cmd->silent_exec_failure)
|
|
child_die(CHILD_ERR_SILENT);
|
|
child_die(CHILD_ERR_ENOENT);
|
|
} else {
|
|
child_die(CHILD_ERR_ERRNO);
|
|
}
|
|
}
|
|
atfork_parent(&as);
|
|
if (cmd->pid < 0)
|
|
error_errno("cannot fork() for %s", cmd->argv[0]);
|
|
else if (cmd->clean_on_exit)
|
|
mark_child_for_cleanup(cmd->pid, cmd);
|
|
|
|
/*
|
|
* Wait for child's exec. If the exec succeeds (or if fork()
|
|
* failed), EOF is seen immediately by the parent. Otherwise, the
|
|
* child process sends a child_err struct.
|
|
* Note that use of this infrastructure is completely advisory,
|
|
* therefore, we keep error checks minimal.
|
|
*/
|
|
close(notify_pipe[1]);
|
|
if (xread(notify_pipe[0], &cerr, sizeof(cerr)) == sizeof(cerr)) {
|
|
/*
|
|
* At this point we know that fork() succeeded, but exec()
|
|
* failed. Errors have been reported to our stderr.
|
|
*/
|
|
wait_or_whine(cmd->pid, cmd->argv[0], 0);
|
|
child_err_spew(cmd, &cerr);
|
|
failed_errno = errno;
|
|
cmd->pid = -1;
|
|
}
|
|
close(notify_pipe[0]);
|
|
|
|
if (null_fd >= 0)
|
|
close(null_fd);
|
|
strvec_clear(&argv);
|
|
free(childenv);
|
|
}
|
|
end_of_spawn:
|
|
|
|
#else
|
|
{
|
|
int fhin = 0, fhout = 1, fherr = 2;
|
|
const char **sargv = cmd->argv;
|
|
struct strvec nargv = STRVEC_INIT;
|
|
|
|
if (cmd->no_stdin)
|
|
fhin = open("/dev/null", O_RDWR);
|
|
else if (need_in)
|
|
fhin = dup(fdin[0]);
|
|
else if (cmd->in)
|
|
fhin = dup(cmd->in);
|
|
|
|
if (cmd->no_stderr)
|
|
fherr = open("/dev/null", O_RDWR);
|
|
else if (need_err)
|
|
fherr = dup(fderr[1]);
|
|
else if (cmd->err > 2)
|
|
fherr = dup(cmd->err);
|
|
|
|
if (cmd->no_stdout)
|
|
fhout = open("/dev/null", O_RDWR);
|
|
else if (cmd->stdout_to_stderr)
|
|
fhout = dup(fherr);
|
|
else if (need_out)
|
|
fhout = dup(fdout[1]);
|
|
else if (cmd->out > 1)
|
|
fhout = dup(cmd->out);
|
|
|
|
if (cmd->git_cmd)
|
|
cmd->argv = prepare_git_cmd(&nargv, cmd->argv);
|
|
else if (cmd->use_shell)
|
|
cmd->argv = prepare_shell_cmd(&nargv, cmd->argv);
|
|
|
|
cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
|
|
cmd->dir, fhin, fhout, fherr);
|
|
failed_errno = errno;
|
|
if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
|
|
error_errno("cannot spawn %s", cmd->argv[0]);
|
|
if (cmd->clean_on_exit && cmd->pid >= 0)
|
|
mark_child_for_cleanup(cmd->pid, cmd);
|
|
|
|
strvec_clear(&nargv);
|
|
cmd->argv = sargv;
|
|
if (fhin != 0)
|
|
close(fhin);
|
|
if (fhout != 1)
|
|
close(fhout);
|
|
if (fherr != 2)
|
|
close(fherr);
|
|
}
|
|
#endif
|
|
|
|
if (cmd->pid < 0) {
|
|
trace2_child_exit(cmd, -1);
|
|
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
if (need_out)
|
|
close_pair(fdout);
|
|
else if (cmd->out)
|
|
close(cmd->out);
|
|
if (need_err)
|
|
close_pair(fderr);
|
|
else if (cmd->err)
|
|
close(cmd->err);
|
|
child_process_clear(cmd);
|
|
errno = failed_errno;
|
|
return -1;
|
|
}
|
|
|
|
if (need_in)
|
|
close(fdin[0]);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
|
|
if (need_out)
|
|
close(fdout[1]);
|
|
else if (cmd->out)
|
|
close(cmd->out);
|
|
|
|
if (need_err)
|
|
close(fderr[1]);
|
|
else if (cmd->err)
|
|
close(cmd->err);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int finish_command(struct child_process *cmd)
|
|
{
|
|
int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0);
|
|
trace2_child_exit(cmd, ret);
|
|
child_process_clear(cmd);
|
|
invalidate_lstat_cache();
|
|
return ret;
|
|
}
|
|
|
|
int finish_command_in_signal(struct child_process *cmd)
|
|
{
|
|
int ret = wait_or_whine(cmd->pid, cmd->argv[0], 1);
|
|
trace2_child_exit(cmd, ret);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int run_command(struct child_process *cmd)
|
|
{
|
|
int code;
|
|
|
|
if (cmd->out < 0 || cmd->err < 0)
|
|
BUG("run_command with a pipe can cause deadlock");
|
|
|
|
code = start_command(cmd);
|
|
if (code)
|
|
return code;
|
|
return finish_command(cmd);
|
|
}
|
|
|
|
int run_command_v_opt(const char **argv, int opt)
|
|
{
|
|
return run_command_v_opt_cd_env(argv, opt, NULL, NULL);
|
|
}
|
|
|
|
int run_command_v_opt_tr2(const char **argv, int opt, const char *tr2_class)
|
|
{
|
|
return run_command_v_opt_cd_env_tr2(argv, opt, NULL, NULL, tr2_class);
|
|
}
|
|
|
|
int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
|
|
{
|
|
return run_command_v_opt_cd_env_tr2(argv, opt, dir, env, NULL);
|
|
}
|
|
|
|
int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir,
|
|
const char *const *env, const char *tr2_class)
|
|
{
|
|
struct child_process cmd = CHILD_PROCESS_INIT;
|
|
cmd.argv = argv;
|
|
cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
|
|
cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
|
|
cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
|
|
cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
|
|
cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0;
|
|
cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
|
|
cmd.wait_after_clean = opt & RUN_WAIT_AFTER_CLEAN ? 1 : 0;
|
|
cmd.dir = dir;
|
|
cmd.env = env;
|
|
cmd.trace2_child_class = tr2_class;
|
|
return run_command(&cmd);
|
|
}
|
|
|
|
#ifndef NO_PTHREADS
|
|
static pthread_t main_thread;
|
|
static int main_thread_set;
|
|
static pthread_key_t async_key;
|
|
static pthread_key_t async_die_counter;
|
|
|
|
static void *run_thread(void *data)
|
|
{
|
|
struct async *async = data;
|
|
intptr_t ret;
|
|
|
|
if (async->isolate_sigpipe) {
|
|
sigset_t mask;
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGPIPE);
|
|
if (pthread_sigmask(SIG_BLOCK, &mask, NULL) < 0) {
|
|
ret = error("unable to block SIGPIPE in async thread");
|
|
return (void *)ret;
|
|
}
|
|
}
|
|
|
|
pthread_setspecific(async_key, async);
|
|
ret = async->proc(async->proc_in, async->proc_out, async->data);
|
|
return (void *)ret;
|
|
}
|
|
|
|
static NORETURN void die_async(const char *err, va_list params)
|
|
{
|
|
vreportf("fatal: ", err, params);
|
|
|
|
if (in_async()) {
|
|
struct async *async = pthread_getspecific(async_key);
|
|
if (async->proc_in >= 0)
|
|
close(async->proc_in);
|
|
if (async->proc_out >= 0)
|
|
close(async->proc_out);
|
|
pthread_exit((void *)128);
|
|
}
|
|
|
|
exit(128);
|
|
}
|
|
|
|
static int async_die_is_recursing(void)
|
|
{
|
|
void *ret = pthread_getspecific(async_die_counter);
|
|
pthread_setspecific(async_die_counter, (void *)1);
|
|
return ret != NULL;
|
|
}
|
|
|
|
int in_async(void)
|
|
{
|
|
if (!main_thread_set)
|
|
return 0; /* no asyncs started yet */
|
|
return !pthread_equal(main_thread, pthread_self());
|
|
}
|
|
|
|
static void NORETURN async_exit(int code)
|
|
{
|
|
pthread_exit((void *)(intptr_t)code);
|
|
}
|
|
|
|
#else
|
|
|
|
static struct {
|
|
void (**handlers)(void);
|
|
size_t nr;
|
|
size_t alloc;
|
|
} git_atexit_hdlrs;
|
|
|
|
static int git_atexit_installed;
|
|
|
|
static void git_atexit_dispatch(void)
|
|
{
|
|
size_t i;
|
|
|
|
for (i=git_atexit_hdlrs.nr ; i ; i--)
|
|
git_atexit_hdlrs.handlers[i-1]();
|
|
}
|
|
|
|
static void git_atexit_clear(void)
|
|
{
|
|
free(git_atexit_hdlrs.handlers);
|
|
memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs));
|
|
git_atexit_installed = 0;
|
|
}
|
|
|
|
#undef atexit
|
|
int git_atexit(void (*handler)(void))
|
|
{
|
|
ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc);
|
|
git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler;
|
|
if (!git_atexit_installed) {
|
|
if (atexit(&git_atexit_dispatch))
|
|
return -1;
|
|
git_atexit_installed = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#define atexit git_atexit
|
|
|
|
static int process_is_async;
|
|
int in_async(void)
|
|
{
|
|
return process_is_async;
|
|
}
|
|
|
|
static void NORETURN async_exit(int code)
|
|
{
|
|
exit(code);
|
|
}
|
|
|
|
#endif
|
|
|
|
void check_pipe(int err)
|
|
{
|
|
if (err == EPIPE) {
|
|
if (in_async())
|
|
async_exit(141);
|
|
|
|
signal(SIGPIPE, SIG_DFL);
|
|
raise(SIGPIPE);
|
|
/* Should never happen, but just in case... */
|
|
exit(141);
|
|
}
|
|
}
|
|
|
|
int start_async(struct async *async)
|
|
{
|
|
int need_in, need_out;
|
|
int fdin[2], fdout[2];
|
|
int proc_in, proc_out;
|
|
|
|
need_in = async->in < 0;
|
|
if (need_in) {
|
|
if (pipe(fdin) < 0) {
|
|
if (async->out > 0)
|
|
close(async->out);
|
|
return error_errno("cannot create pipe");
|
|
}
|
|
async->in = fdin[1];
|
|
}
|
|
|
|
need_out = async->out < 0;
|
|
if (need_out) {
|
|
if (pipe(fdout) < 0) {
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (async->in)
|
|
close(async->in);
|
|
return error_errno("cannot create pipe");
|
|
}
|
|
async->out = fdout[0];
|
|
}
|
|
|
|
if (need_in)
|
|
proc_in = fdin[0];
|
|
else if (async->in)
|
|
proc_in = async->in;
|
|
else
|
|
proc_in = -1;
|
|
|
|
if (need_out)
|
|
proc_out = fdout[1];
|
|
else if (async->out)
|
|
proc_out = async->out;
|
|
else
|
|
proc_out = -1;
|
|
|
|
#ifdef NO_PTHREADS
|
|
/* Flush stdio before fork() to avoid cloning buffers */
|
|
fflush(NULL);
|
|
|
|
async->pid = fork();
|
|
if (async->pid < 0) {
|
|
error_errno("fork (async) failed");
|
|
goto error;
|
|
}
|
|
if (!async->pid) {
|
|
if (need_in)
|
|
close(fdin[1]);
|
|
if (need_out)
|
|
close(fdout[0]);
|
|
git_atexit_clear();
|
|
process_is_async = 1;
|
|
exit(!!async->proc(proc_in, proc_out, async->data));
|
|
}
|
|
|
|
mark_child_for_cleanup(async->pid, NULL);
|
|
|
|
if (need_in)
|
|
close(fdin[0]);
|
|
else if (async->in)
|
|
close(async->in);
|
|
|
|
if (need_out)
|
|
close(fdout[1]);
|
|
else if (async->out)
|
|
close(async->out);
|
|
#else
|
|
if (!main_thread_set) {
|
|
/*
|
|
* We assume that the first time that start_async is called
|
|
* it is from the main thread.
|
|
*/
|
|
main_thread_set = 1;
|
|
main_thread = pthread_self();
|
|
pthread_key_create(&async_key, NULL);
|
|
pthread_key_create(&async_die_counter, NULL);
|
|
set_die_routine(die_async);
|
|
set_die_is_recursing_routine(async_die_is_recursing);
|
|
}
|
|
|
|
if (proc_in >= 0)
|
|
set_cloexec(proc_in);
|
|
if (proc_out >= 0)
|
|
set_cloexec(proc_out);
|
|
async->proc_in = proc_in;
|
|
async->proc_out = proc_out;
|
|
{
|
|
int err = pthread_create(&async->tid, NULL, run_thread, async);
|
|
if (err) {
|
|
error(_("cannot create async thread: %s"), strerror(err));
|
|
goto error;
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
|
|
error:
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (async->in)
|
|
close(async->in);
|
|
|
|
if (need_out)
|
|
close_pair(fdout);
|
|
else if (async->out)
|
|
close(async->out);
|
|
return -1;
|
|
}
|
|
|
|
int finish_async(struct async *async)
|
|
{
|
|
#ifdef NO_PTHREADS
|
|
int ret = wait_or_whine(async->pid, "child process", 0);
|
|
|
|
invalidate_lstat_cache();
|
|
|
|
return ret;
|
|
#else
|
|
void *ret = (void *)(intptr_t)(-1);
|
|
|
|
if (pthread_join(async->tid, &ret))
|
|
error("pthread_join failed");
|
|
invalidate_lstat_cache();
|
|
return (int)(intptr_t)ret;
|
|
|
|
#endif
|
|
}
|
|
|
|
int async_with_fork(void)
|
|
{
|
|
#ifdef NO_PTHREADS
|
|
return 1;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
const char *find_hook(const char *name)
|
|
{
|
|
static struct strbuf path = STRBUF_INIT;
|
|
|
|
strbuf_reset(&path);
|
|
strbuf_git_path(&path, "hooks/%s", name);
|
|
if (access(path.buf, X_OK) < 0) {
|
|
int err = errno;
|
|
|
|
#ifdef STRIP_EXTENSION
|
|
strbuf_addstr(&path, STRIP_EXTENSION);
|
|
if (access(path.buf, X_OK) >= 0)
|
|
return path.buf;
|
|
if (errno == EACCES)
|
|
err = errno;
|
|
#endif
|
|
|
|
if (err == EACCES && advice_ignored_hook) {
|
|
static struct string_list advise_given = STRING_LIST_INIT_DUP;
|
|
|
|
if (!string_list_lookup(&advise_given, name)) {
|
|
string_list_insert(&advise_given, name);
|
|
advise(_("The '%s' hook was ignored because "
|
|
"it's not set as executable.\n"
|
|
"You can disable this warning with "
|
|
"`git config advice.ignoredHook false`."),
|
|
path.buf);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
return path.buf;
|
|
}
|
|
|
|
int run_hook_ve(const char *const *env, const char *name, va_list args)
|
|
{
|
|
struct child_process hook = CHILD_PROCESS_INIT;
|
|
const char *p;
|
|
|
|
p = find_hook(name);
|
|
if (!p)
|
|
return 0;
|
|
|
|
strvec_push(&hook.args, p);
|
|
while ((p = va_arg(args, const char *)))
|
|
strvec_push(&hook.args, p);
|
|
hook.env = env;
|
|
hook.no_stdin = 1;
|
|
hook.stdout_to_stderr = 1;
|
|
hook.trace2_hook_name = name;
|
|
|
|
return run_command(&hook);
|
|
}
|
|
|
|
int run_hook_le(const char *const *env, const char *name, ...)
|
|
{
|
|
va_list args;
|
|
int ret;
|
|
|
|
va_start(args, name);
|
|
ret = run_hook_ve(env, name, args);
|
|
va_end(args);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct io_pump {
|
|
/* initialized by caller */
|
|
int fd;
|
|
int type; /* POLLOUT or POLLIN */
|
|
union {
|
|
struct {
|
|
const char *buf;
|
|
size_t len;
|
|
} out;
|
|
struct {
|
|
struct strbuf *buf;
|
|
size_t hint;
|
|
} in;
|
|
} u;
|
|
|
|
/* returned by pump_io */
|
|
int error; /* 0 for success, otherwise errno */
|
|
|
|
/* internal use */
|
|
struct pollfd *pfd;
|
|
};
|
|
|
|
static int pump_io_round(struct io_pump *slots, int nr, struct pollfd *pfd)
|
|
{
|
|
int pollsize = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
struct io_pump *io = &slots[i];
|
|
if (io->fd < 0)
|
|
continue;
|
|
pfd[pollsize].fd = io->fd;
|
|
pfd[pollsize].events = io->type;
|
|
io->pfd = &pfd[pollsize++];
|
|
}
|
|
|
|
if (!pollsize)
|
|
return 0;
|
|
|
|
if (poll(pfd, pollsize, -1) < 0) {
|
|
if (errno == EINTR)
|
|
return 1;
|
|
die_errno("poll failed");
|
|
}
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
struct io_pump *io = &slots[i];
|
|
|
|
if (io->fd < 0)
|
|
continue;
|
|
|
|
if (!(io->pfd->revents & (POLLOUT|POLLIN|POLLHUP|POLLERR|POLLNVAL)))
|
|
continue;
|
|
|
|
if (io->type == POLLOUT) {
|
|
ssize_t len = xwrite(io->fd,
|
|
io->u.out.buf, io->u.out.len);
|
|
if (len < 0) {
|
|
io->error = errno;
|
|
close(io->fd);
|
|
io->fd = -1;
|
|
} else {
|
|
io->u.out.buf += len;
|
|
io->u.out.len -= len;
|
|
if (!io->u.out.len) {
|
|
close(io->fd);
|
|
io->fd = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (io->type == POLLIN) {
|
|
ssize_t len = strbuf_read_once(io->u.in.buf,
|
|
io->fd, io->u.in.hint);
|
|
if (len < 0)
|
|
io->error = errno;
|
|
if (len <= 0) {
|
|
close(io->fd);
|
|
io->fd = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int pump_io(struct io_pump *slots, int nr)
|
|
{
|
|
struct pollfd *pfd;
|
|
int i;
|
|
|
|
for (i = 0; i < nr; i++)
|
|
slots[i].error = 0;
|
|
|
|
ALLOC_ARRAY(pfd, nr);
|
|
while (pump_io_round(slots, nr, pfd))
|
|
; /* nothing */
|
|
free(pfd);
|
|
|
|
/* There may be multiple errno values, so just pick the first. */
|
|
for (i = 0; i < nr; i++) {
|
|
if (slots[i].error) {
|
|
errno = slots[i].error;
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
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)
|
|
{
|
|
struct io_pump io[3];
|
|
int nr = 0;
|
|
|
|
if (in)
|
|
cmd->in = -1;
|
|
if (out)
|
|
cmd->out = -1;
|
|
if (err)
|
|
cmd->err = -1;
|
|
|
|
if (start_command(cmd) < 0)
|
|
return -1;
|
|
|
|
if (in) {
|
|
io[nr].fd = cmd->in;
|
|
io[nr].type = POLLOUT;
|
|
io[nr].u.out.buf = in;
|
|
io[nr].u.out.len = in_len;
|
|
nr++;
|
|
}
|
|
if (out) {
|
|
io[nr].fd = cmd->out;
|
|
io[nr].type = POLLIN;
|
|
io[nr].u.in.buf = out;
|
|
io[nr].u.in.hint = out_hint;
|
|
nr++;
|
|
}
|
|
if (err) {
|
|
io[nr].fd = cmd->err;
|
|
io[nr].type = POLLIN;
|
|
io[nr].u.in.buf = err;
|
|
io[nr].u.in.hint = err_hint;
|
|
nr++;
|
|
}
|
|
|
|
if (pump_io(io, nr) < 0) {
|
|
finish_command(cmd); /* throw away exit code */
|
|
return -1;
|
|
}
|
|
|
|
return finish_command(cmd);
|
|
}
|
|
|
|
enum child_state {
|
|
GIT_CP_FREE,
|
|
GIT_CP_WORKING,
|
|
GIT_CP_WAIT_CLEANUP,
|
|
};
|
|
|
|
struct parallel_processes {
|
|
void *data;
|
|
|
|
int max_processes;
|
|
int nr_processes;
|
|
|
|
get_next_task_fn get_next_task;
|
|
start_failure_fn start_failure;
|
|
task_finished_fn task_finished;
|
|
|
|
struct {
|
|
enum child_state state;
|
|
struct child_process process;
|
|
struct strbuf err;
|
|
void *data;
|
|
} *children;
|
|
/*
|
|
* The struct pollfd is logically part of *children,
|
|
* but the system call expects it as its own array.
|
|
*/
|
|
struct pollfd *pfd;
|
|
|
|
unsigned shutdown : 1;
|
|
|
|
int output_owner;
|
|
struct strbuf buffered_output; /* of finished children */
|
|
};
|
|
|
|
static int default_start_failure(struct strbuf *out,
|
|
void *pp_cb,
|
|
void *pp_task_cb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int default_task_finished(int result,
|
|
struct strbuf *out,
|
|
void *pp_cb,
|
|
void *pp_task_cb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void kill_children(struct parallel_processes *pp, int signo)
|
|
{
|
|
int i, n = pp->max_processes;
|
|
|
|
for (i = 0; i < n; i++)
|
|
if (pp->children[i].state == GIT_CP_WORKING)
|
|
kill(pp->children[i].process.pid, signo);
|
|
}
|
|
|
|
static struct parallel_processes *pp_for_signal;
|
|
|
|
static void handle_children_on_signal(int signo)
|
|
{
|
|
kill_children(pp_for_signal, signo);
|
|
sigchain_pop(signo);
|
|
raise(signo);
|
|
}
|
|
|
|
static void pp_init(struct parallel_processes *pp,
|
|
int n,
|
|
get_next_task_fn get_next_task,
|
|
start_failure_fn start_failure,
|
|
task_finished_fn task_finished,
|
|
void *data)
|
|
{
|
|
int i;
|
|
|
|
if (n < 1)
|
|
n = online_cpus();
|
|
|
|
pp->max_processes = n;
|
|
|
|
trace_printf("run_processes_parallel: preparing to run up to %d tasks", n);
|
|
|
|
pp->data = data;
|
|
if (!get_next_task)
|
|
BUG("you need to specify a get_next_task function");
|
|
pp->get_next_task = get_next_task;
|
|
|
|
pp->start_failure = start_failure ? start_failure : default_start_failure;
|
|
pp->task_finished = task_finished ? task_finished : default_task_finished;
|
|
|
|
pp->nr_processes = 0;
|
|
pp->output_owner = 0;
|
|
pp->shutdown = 0;
|
|
CALLOC_ARRAY(pp->children, n);
|
|
CALLOC_ARRAY(pp->pfd, n);
|
|
strbuf_init(&pp->buffered_output, 0);
|
|
|
|
for (i = 0; i < n; i++) {
|
|
strbuf_init(&pp->children[i].err, 0);
|
|
child_process_init(&pp->children[i].process);
|
|
pp->pfd[i].events = POLLIN | POLLHUP;
|
|
pp->pfd[i].fd = -1;
|
|
}
|
|
|
|
pp_for_signal = pp;
|
|
sigchain_push_common(handle_children_on_signal);
|
|
}
|
|
|
|
static void pp_cleanup(struct parallel_processes *pp)
|
|
{
|
|
int i;
|
|
|
|
trace_printf("run_processes_parallel: done");
|
|
for (i = 0; i < pp->max_processes; i++) {
|
|
strbuf_release(&pp->children[i].err);
|
|
child_process_clear(&pp->children[i].process);
|
|
}
|
|
|
|
free(pp->children);
|
|
free(pp->pfd);
|
|
|
|
/*
|
|
* When get_next_task added messages to the buffer in its last
|
|
* iteration, the buffered output is non empty.
|
|
*/
|
|
strbuf_write(&pp->buffered_output, stderr);
|
|
strbuf_release(&pp->buffered_output);
|
|
|
|
sigchain_pop_common();
|
|
}
|
|
|
|
/* returns
|
|
* 0 if a new task was started.
|
|
* 1 if no new jobs was started (get_next_task ran out of work, non critical
|
|
* problem with starting a new command)
|
|
* <0 no new job was started, user wishes to shutdown early. Use negative code
|
|
* to signal the children.
|
|
*/
|
|
static int pp_start_one(struct parallel_processes *pp)
|
|
{
|
|
int i, code;
|
|
|
|
for (i = 0; i < pp->max_processes; i++)
|
|
if (pp->children[i].state == GIT_CP_FREE)
|
|
break;
|
|
if (i == pp->max_processes)
|
|
BUG("bookkeeping is hard");
|
|
|
|
code = pp->get_next_task(&pp->children[i].process,
|
|
&pp->children[i].err,
|
|
pp->data,
|
|
&pp->children[i].data);
|
|
if (!code) {
|
|
strbuf_addbuf(&pp->buffered_output, &pp->children[i].err);
|
|
strbuf_reset(&pp->children[i].err);
|
|
return 1;
|
|
}
|
|
pp->children[i].process.err = -1;
|
|
pp->children[i].process.stdout_to_stderr = 1;
|
|
pp->children[i].process.no_stdin = 1;
|
|
|
|
if (start_command(&pp->children[i].process)) {
|
|
code = pp->start_failure(&pp->children[i].err,
|
|
pp->data,
|
|
pp->children[i].data);
|
|
strbuf_addbuf(&pp->buffered_output, &pp->children[i].err);
|
|
strbuf_reset(&pp->children[i].err);
|
|
if (code)
|
|
pp->shutdown = 1;
|
|
return code;
|
|
}
|
|
|
|
pp->nr_processes++;
|
|
pp->children[i].state = GIT_CP_WORKING;
|
|
pp->pfd[i].fd = pp->children[i].process.err;
|
|
return 0;
|
|
}
|
|
|
|
static void pp_buffer_stderr(struct parallel_processes *pp, int output_timeout)
|
|
{
|
|
int i;
|
|
|
|
while ((i = poll(pp->pfd, pp->max_processes, output_timeout)) < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
pp_cleanup(pp);
|
|
die_errno("poll");
|
|
}
|
|
|
|
/* Buffer output from all pipes. */
|
|
for (i = 0; i < pp->max_processes; i++) {
|
|
if (pp->children[i].state == GIT_CP_WORKING &&
|
|
pp->pfd[i].revents & (POLLIN | POLLHUP)) {
|
|
int n = strbuf_read_once(&pp->children[i].err,
|
|
pp->children[i].process.err, 0);
|
|
if (n == 0) {
|
|
close(pp->children[i].process.err);
|
|
pp->children[i].state = GIT_CP_WAIT_CLEANUP;
|
|
} else if (n < 0)
|
|
if (errno != EAGAIN)
|
|
die_errno("read");
|
|
}
|
|
}
|
|
}
|
|
|
|
static void pp_output(struct parallel_processes *pp)
|
|
{
|
|
int i = pp->output_owner;
|
|
if (pp->children[i].state == GIT_CP_WORKING &&
|
|
pp->children[i].err.len) {
|
|
strbuf_write(&pp->children[i].err, stderr);
|
|
strbuf_reset(&pp->children[i].err);
|
|
}
|
|
}
|
|
|
|
static int pp_collect_finished(struct parallel_processes *pp)
|
|
{
|
|
int i, code;
|
|
int n = pp->max_processes;
|
|
int result = 0;
|
|
|
|
while (pp->nr_processes > 0) {
|
|
for (i = 0; i < pp->max_processes; i++)
|
|
if (pp->children[i].state == GIT_CP_WAIT_CLEANUP)
|
|
break;
|
|
if (i == pp->max_processes)
|
|
break;
|
|
|
|
code = finish_command(&pp->children[i].process);
|
|
|
|
code = pp->task_finished(code,
|
|
&pp->children[i].err, pp->data,
|
|
pp->children[i].data);
|
|
|
|
if (code)
|
|
result = code;
|
|
if (code < 0)
|
|
break;
|
|
|
|
pp->nr_processes--;
|
|
pp->children[i].state = GIT_CP_FREE;
|
|
pp->pfd[i].fd = -1;
|
|
child_process_init(&pp->children[i].process);
|
|
|
|
if (i != pp->output_owner) {
|
|
strbuf_addbuf(&pp->buffered_output, &pp->children[i].err);
|
|
strbuf_reset(&pp->children[i].err);
|
|
} else {
|
|
strbuf_write(&pp->children[i].err, stderr);
|
|
strbuf_reset(&pp->children[i].err);
|
|
|
|
/* Output all other finished child processes */
|
|
strbuf_write(&pp->buffered_output, stderr);
|
|
strbuf_reset(&pp->buffered_output);
|
|
|
|
/*
|
|
* Pick next process to output live.
|
|
* NEEDSWORK:
|
|
* For now we pick it randomly by doing a round
|
|
* robin. Later we may want to pick the one with
|
|
* the most output or the longest or shortest
|
|
* running process time.
|
|
*/
|
|
for (i = 0; i < n; i++)
|
|
if (pp->children[(pp->output_owner + i) % n].state == GIT_CP_WORKING)
|
|
break;
|
|
pp->output_owner = (pp->output_owner + i) % n;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
int run_processes_parallel(int n,
|
|
get_next_task_fn get_next_task,
|
|
start_failure_fn start_failure,
|
|
task_finished_fn task_finished,
|
|
void *pp_cb)
|
|
{
|
|
int i, code;
|
|
int output_timeout = 100;
|
|
int spawn_cap = 4;
|
|
struct parallel_processes pp;
|
|
|
|
pp_init(&pp, n, get_next_task, start_failure, task_finished, pp_cb);
|
|
while (1) {
|
|
for (i = 0;
|
|
i < spawn_cap && !pp.shutdown &&
|
|
pp.nr_processes < pp.max_processes;
|
|
i++) {
|
|
code = pp_start_one(&pp);
|
|
if (!code)
|
|
continue;
|
|
if (code < 0) {
|
|
pp.shutdown = 1;
|
|
kill_children(&pp, -code);
|
|
}
|
|
break;
|
|
}
|
|
if (!pp.nr_processes)
|
|
break;
|
|
pp_buffer_stderr(&pp, output_timeout);
|
|
pp_output(&pp);
|
|
code = pp_collect_finished(&pp);
|
|
if (code) {
|
|
pp.shutdown = 1;
|
|
if (code < 0)
|
|
kill_children(&pp, -code);
|
|
}
|
|
}
|
|
|
|
pp_cleanup(&pp);
|
|
return 0;
|
|
}
|
|
|
|
int run_processes_parallel_tr2(int n, get_next_task_fn get_next_task,
|
|
start_failure_fn start_failure,
|
|
task_finished_fn task_finished, void *pp_cb,
|
|
const char *tr2_category, const char *tr2_label)
|
|
{
|
|
int result;
|
|
|
|
trace2_region_enter_printf(tr2_category, tr2_label, NULL, "max:%d",
|
|
((n < 1) ? online_cpus() : n));
|
|
|
|
result = run_processes_parallel(n, get_next_task, start_failure,
|
|
task_finished, pp_cb);
|
|
|
|
trace2_region_leave(tr2_category, tr2_label, NULL);
|
|
|
|
return result;
|
|
}
|
|
|
|
int run_auto_maintenance(int quiet)
|
|
{
|
|
int enabled;
|
|
struct child_process maint = CHILD_PROCESS_INIT;
|
|
|
|
if (!git_config_get_bool("maintenance.auto", &enabled) &&
|
|
!enabled)
|
|
return 0;
|
|
|
|
maint.git_cmd = 1;
|
|
strvec_pushl(&maint.args, "maintenance", "run", "--auto", NULL);
|
|
strvec_push(&maint.args, quiet ? "--quiet" : "--no-quiet");
|
|
|
|
return run_command(&maint);
|
|
}
|