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![Junio C Hamano](/assets/img/avatar_default.png)
Correct pthread API usage. * sx/pthread-error-check-fix: maintenance: compare output of pthread functions for inequality with 0
1589 lines
44 KiB
C
1589 lines
44 KiB
C
#include "builtin.h"
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#include "config.h"
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#include "parse-options.h"
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#include "fsmonitor.h"
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#include "fsmonitor-ipc.h"
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#include "fsmonitor-path-utils.h"
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#include "compat/fsmonitor/fsm-health.h"
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#include "compat/fsmonitor/fsm-listen.h"
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#include "fsmonitor--daemon.h"
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#include "simple-ipc.h"
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#include "khash.h"
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#include "pkt-line.h"
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static const char * const builtin_fsmonitor__daemon_usage[] = {
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N_("git fsmonitor--daemon start [<options>]"),
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N_("git fsmonitor--daemon run [<options>]"),
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"git fsmonitor--daemon stop",
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"git fsmonitor--daemon status",
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NULL
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};
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#ifdef HAVE_FSMONITOR_DAEMON_BACKEND
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/*
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* Global state loaded from config.
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*/
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#define FSMONITOR__IPC_THREADS "fsmonitor.ipcthreads"
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static int fsmonitor__ipc_threads = 8;
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#define FSMONITOR__START_TIMEOUT "fsmonitor.starttimeout"
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static int fsmonitor__start_timeout_sec = 60;
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#define FSMONITOR__ANNOUNCE_STARTUP "fsmonitor.announcestartup"
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static int fsmonitor__announce_startup = 0;
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static int fsmonitor_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, FSMONITOR__IPC_THREADS)) {
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int i = git_config_int(var, value);
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if (i < 1)
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return error(_("value of '%s' out of range: %d"),
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FSMONITOR__IPC_THREADS, i);
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fsmonitor__ipc_threads = i;
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return 0;
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}
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if (!strcmp(var, FSMONITOR__START_TIMEOUT)) {
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int i = git_config_int(var, value);
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if (i < 0)
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return error(_("value of '%s' out of range: %d"),
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FSMONITOR__START_TIMEOUT, i);
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fsmonitor__start_timeout_sec = i;
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return 0;
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}
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if (!strcmp(var, FSMONITOR__ANNOUNCE_STARTUP)) {
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int is_bool;
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int i = git_config_bool_or_int(var, value, &is_bool);
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if (i < 0)
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return error(_("value of '%s' not bool or int: %d"),
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var, i);
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fsmonitor__announce_startup = i;
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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/*
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* Acting as a CLIENT.
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*
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* Send a "quit" command to the `git-fsmonitor--daemon` (if running)
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* and wait for it to shutdown.
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*/
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static int do_as_client__send_stop(void)
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{
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struct strbuf answer = STRBUF_INIT;
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int ret;
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ret = fsmonitor_ipc__send_command("quit", &answer);
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/* The quit command does not return any response data. */
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strbuf_release(&answer);
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if (ret)
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return ret;
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trace2_region_enter("fsm_client", "polling-for-daemon-exit", NULL);
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while (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
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sleep_millisec(50);
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trace2_region_leave("fsm_client", "polling-for-daemon-exit", NULL);
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return 0;
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}
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static int do_as_client__status(void)
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{
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enum ipc_active_state state = fsmonitor_ipc__get_state();
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switch (state) {
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case IPC_STATE__LISTENING:
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printf(_("fsmonitor-daemon is watching '%s'\n"),
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the_repository->worktree);
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return 0;
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default:
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printf(_("fsmonitor-daemon is not watching '%s'\n"),
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the_repository->worktree);
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return 1;
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}
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}
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enum fsmonitor_cookie_item_result {
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FCIR_ERROR = -1, /* could not create cookie file ? */
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FCIR_INIT,
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FCIR_SEEN,
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FCIR_ABORT,
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};
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struct fsmonitor_cookie_item {
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struct hashmap_entry entry;
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char *name;
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enum fsmonitor_cookie_item_result result;
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};
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static int cookies_cmp(const void *data, const struct hashmap_entry *he1,
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const struct hashmap_entry *he2, const void *keydata)
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{
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const struct fsmonitor_cookie_item *a =
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container_of(he1, const struct fsmonitor_cookie_item, entry);
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const struct fsmonitor_cookie_item *b =
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container_of(he2, const struct fsmonitor_cookie_item, entry);
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return strcmp(a->name, keydata ? keydata : b->name);
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}
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static enum fsmonitor_cookie_item_result with_lock__wait_for_cookie(
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struct fsmonitor_daemon_state *state)
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{
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/* assert current thread holding state->main_lock */
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int fd;
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struct fsmonitor_cookie_item *cookie;
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struct strbuf cookie_pathname = STRBUF_INIT;
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struct strbuf cookie_filename = STRBUF_INIT;
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enum fsmonitor_cookie_item_result result;
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int my_cookie_seq;
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CALLOC_ARRAY(cookie, 1);
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my_cookie_seq = state->cookie_seq++;
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strbuf_addf(&cookie_filename, "%i-%i", getpid(), my_cookie_seq);
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strbuf_addbuf(&cookie_pathname, &state->path_cookie_prefix);
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strbuf_addbuf(&cookie_pathname, &cookie_filename);
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cookie->name = strbuf_detach(&cookie_filename, NULL);
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cookie->result = FCIR_INIT;
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hashmap_entry_init(&cookie->entry, strhash(cookie->name));
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hashmap_add(&state->cookies, &cookie->entry);
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trace_printf_key(&trace_fsmonitor, "cookie-wait: '%s' '%s'",
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cookie->name, cookie_pathname.buf);
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/*
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* Create the cookie file on disk and then wait for a notification
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* that the listener thread has seen it.
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*/
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fd = open(cookie_pathname.buf, O_WRONLY | O_CREAT | O_EXCL, 0600);
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if (fd < 0) {
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error_errno(_("could not create fsmonitor cookie '%s'"),
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cookie->name);
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cookie->result = FCIR_ERROR;
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goto done;
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}
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/*
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* Technically, close() and unlink() can fail, but we don't
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* care here. We only created the file to trigger a watch
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* event from the FS to know that when we're up to date.
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*/
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close(fd);
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unlink(cookie_pathname.buf);
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/*
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* Technically, this is an infinite wait (well, unless another
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* thread sends us an abort). I'd like to change this to
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* use `pthread_cond_timedwait()` and return an error/timeout
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* and let the caller do the trivial response thing, but we
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* don't have that routine in our thread-utils.
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*
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* After extensive beta testing I'm not really worried about
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* this. Also note that the above open() and unlink() calls
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* will cause at least two FS events on that path, so the odds
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* of getting stuck are pretty slim.
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*/
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while (cookie->result == FCIR_INIT)
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pthread_cond_wait(&state->cookies_cond,
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&state->main_lock);
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done:
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hashmap_remove(&state->cookies, &cookie->entry, NULL);
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result = cookie->result;
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free(cookie->name);
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free(cookie);
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strbuf_release(&cookie_pathname);
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return result;
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}
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/*
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* Mark these cookies as _SEEN and wake up the corresponding client threads.
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*/
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static void with_lock__mark_cookies_seen(struct fsmonitor_daemon_state *state,
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const struct string_list *cookie_names)
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{
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/* assert current thread holding state->main_lock */
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int k;
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int nr_seen = 0;
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for (k = 0; k < cookie_names->nr; k++) {
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struct fsmonitor_cookie_item key;
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struct fsmonitor_cookie_item *cookie;
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key.name = cookie_names->items[k].string;
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hashmap_entry_init(&key.entry, strhash(key.name));
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cookie = hashmap_get_entry(&state->cookies, &key, entry, NULL);
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if (cookie) {
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trace_printf_key(&trace_fsmonitor, "cookie-seen: '%s'",
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cookie->name);
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cookie->result = FCIR_SEEN;
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nr_seen++;
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}
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}
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if (nr_seen)
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pthread_cond_broadcast(&state->cookies_cond);
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}
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/*
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* Set _ABORT on all pending cookies and wake up all client threads.
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*/
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static void with_lock__abort_all_cookies(struct fsmonitor_daemon_state *state)
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{
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/* assert current thread holding state->main_lock */
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struct hashmap_iter iter;
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struct fsmonitor_cookie_item *cookie;
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int nr_aborted = 0;
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hashmap_for_each_entry(&state->cookies, &iter, cookie, entry) {
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trace_printf_key(&trace_fsmonitor, "cookie-abort: '%s'",
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cookie->name);
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cookie->result = FCIR_ABORT;
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nr_aborted++;
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}
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if (nr_aborted)
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pthread_cond_broadcast(&state->cookies_cond);
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}
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/*
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* Requests to and from a FSMonitor Protocol V2 provider use an opaque
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* "token" as a virtual timestamp. Clients can request a summary of all
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* created/deleted/modified files relative to a token. In the response,
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* clients receive a new token for the next (relative) request.
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*
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*
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* Token Format
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* ============
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*
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* The contents of the token are private and provider-specific.
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*
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* For the built-in fsmonitor--daemon, we define a token as follows:
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*
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* "builtin" ":" <token_id> ":" <sequence_nr>
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*
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* The "builtin" prefix is used as a namespace to avoid conflicts
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* with other providers (such as Watchman).
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*
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* The <token_id> is an arbitrary OPAQUE string, such as a GUID,
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* UUID, or {timestamp,pid}. It is used to group all filesystem
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* events that happened while the daemon was monitoring (and in-sync
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* with the filesystem).
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*
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* Unlike FSMonitor Protocol V1, it is not defined as a timestamp
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* and does not define less-than/greater-than relationships.
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* (There are too many race conditions to rely on file system
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* event timestamps.)
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*
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* The <sequence_nr> is a simple integer incremented whenever the
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* daemon needs to make its state public. For example, if 1000 file
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* system events come in, but no clients have requested the data,
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* the daemon can continue to accumulate file changes in the same
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* bin and does not need to advance the sequence number. However,
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* as soon as a client does arrive, the daemon needs to start a new
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* bin and increment the sequence number.
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*
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* The sequence number serves as the boundary between 2 sets
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* of bins -- the older ones that the client has already seen
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* and the newer ones that it hasn't.
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*
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* When a new <token_id> is created, the <sequence_nr> is reset to
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* zero.
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*
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*
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* About Token Ids
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* ===============
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*
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* A new token_id is created:
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*
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* [1] each time the daemon is started.
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*
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* [2] any time that the daemon must re-sync with the filesystem
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* (such as when the kernel drops or we miss events on a very
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* active volume).
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*
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* [3] in response to a client "flush" command (for dropped event
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* testing).
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*
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* When a new token_id is created, the daemon is free to discard all
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* cached filesystem events associated with any previous token_ids.
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* Events associated with a non-current token_id will never be sent
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* to a client. A token_id change implicitly means that the daemon
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* has gap in its event history.
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*
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* Therefore, clients that present a token with a stale (non-current)
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* token_id will always be given a trivial response.
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*/
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struct fsmonitor_token_data {
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struct strbuf token_id;
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struct fsmonitor_batch *batch_head;
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struct fsmonitor_batch *batch_tail;
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uint64_t client_ref_count;
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};
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struct fsmonitor_batch {
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struct fsmonitor_batch *next;
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uint64_t batch_seq_nr;
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const char **interned_paths;
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size_t nr, alloc;
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time_t pinned_time;
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};
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static struct fsmonitor_token_data *fsmonitor_new_token_data(void)
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{
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static int test_env_value = -1;
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static uint64_t flush_count = 0;
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struct fsmonitor_token_data *token;
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struct fsmonitor_batch *batch;
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CALLOC_ARRAY(token, 1);
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batch = fsmonitor_batch__new();
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strbuf_init(&token->token_id, 0);
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token->batch_head = batch;
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token->batch_tail = batch;
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token->client_ref_count = 0;
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if (test_env_value < 0)
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test_env_value = git_env_bool("GIT_TEST_FSMONITOR_TOKEN", 0);
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if (!test_env_value) {
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struct timeval tv;
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struct tm tm;
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time_t secs;
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gettimeofday(&tv, NULL);
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secs = tv.tv_sec;
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gmtime_r(&secs, &tm);
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strbuf_addf(&token->token_id,
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"%"PRIu64".%d.%4d%02d%02dT%02d%02d%02d.%06ldZ",
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flush_count++,
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getpid(),
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tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
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tm.tm_hour, tm.tm_min, tm.tm_sec,
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(long)tv.tv_usec);
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} else {
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strbuf_addf(&token->token_id, "test_%08x", test_env_value++);
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}
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/*
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* We created a new <token_id> and are starting a new series
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* of tokens with a zero <seq_nr>.
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*
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* Since clients cannot guess our new (non test) <token_id>
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* they will always receive a trivial response (because of the
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* mismatch on the <token_id>). The trivial response will
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* tell them our new <token_id> so that subsequent requests
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* will be relative to our new series. (And when sending that
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* response, we pin the current head of the batch list.)
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*
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* Even if the client correctly guesses the <token_id>, their
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* request of "builtin:<token_id>:0" asks for all changes MORE
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* RECENT than batch/bin 0.
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*
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* This implies that it is a waste to accumulate paths in the
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* initial batch/bin (because they will never be transmitted).
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*
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* So the daemon could be running for days and watching the
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* file system, but doesn't need to actually accumulate any
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* paths UNTIL we need to set a reference point for a later
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* relative request.
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*
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* However, it is very useful for testing to always have a
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* reference point set. Pin batch 0 to force early file system
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* events to accumulate.
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*/
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if (test_env_value)
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batch->pinned_time = time(NULL);
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return token;
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}
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struct fsmonitor_batch *fsmonitor_batch__new(void)
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{
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struct fsmonitor_batch *batch;
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CALLOC_ARRAY(batch, 1);
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return batch;
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}
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void fsmonitor_batch__free_list(struct fsmonitor_batch *batch)
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{
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while (batch) {
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struct fsmonitor_batch *next = batch->next;
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/*
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* The actual strings within the array of this batch
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* are interned, so we don't own them. We only own
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* the array.
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*/
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free(batch->interned_paths);
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free(batch);
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batch = next;
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}
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}
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void fsmonitor_batch__add_path(struct fsmonitor_batch *batch,
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const char *path)
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{
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const char *interned_path = strintern(path);
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trace_printf_key(&trace_fsmonitor, "event: %s", interned_path);
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ALLOC_GROW(batch->interned_paths, batch->nr + 1, batch->alloc);
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batch->interned_paths[batch->nr++] = interned_path;
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}
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static void fsmonitor_batch__combine(struct fsmonitor_batch *batch_dest,
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const struct fsmonitor_batch *batch_src)
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{
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size_t k;
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ALLOC_GROW(batch_dest->interned_paths,
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batch_dest->nr + batch_src->nr + 1,
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batch_dest->alloc);
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for (k = 0; k < batch_src->nr; k++)
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batch_dest->interned_paths[batch_dest->nr++] =
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batch_src->interned_paths[k];
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}
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/*
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* To keep the batch list from growing unbounded in response to filesystem
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* activity, we try to truncate old batches from the end of the list as
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* they become irrelevant.
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*
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* We assume that the .git/index will be updated with the most recent token
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* any time the index is updated. And future commands will only ask for
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* recent changes *since* that new token. So as tokens advance into the
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* future, older batch items will never be requested/needed. So we can
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* truncate them without loss of functionality.
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*
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* However, multiple commands may be talking to the daemon concurrently
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* or perform a slow command, so a little "token skew" is possible.
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* Therefore, we want this to be a little bit lazy and have a generous
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* delay.
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*
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* The current reader thread walked backwards in time from `token->batch_head`
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* back to `batch_marker` somewhere in the middle of the batch list.
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*
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* Let's walk backwards in time from that marker an arbitrary delay
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* and truncate the list there. Note that these timestamps are completely
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* artificial (based on when we pinned the batch item) and not on any
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* filesystem activity.
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*
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* Return the obsolete portion of the list after we have removed it from
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* the official list so that the caller can free it after leaving the lock.
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*/
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#define MY_TIME_DELAY_SECONDS (5 * 60) /* seconds */
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|
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static struct fsmonitor_batch *with_lock__truncate_old_batches(
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struct fsmonitor_daemon_state *state,
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const struct fsmonitor_batch *batch_marker)
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{
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/* assert current thread holding state->main_lock */
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|
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const struct fsmonitor_batch *batch;
|
|
struct fsmonitor_batch *remainder;
|
|
|
|
if (!batch_marker)
|
|
return NULL;
|
|
|
|
trace_printf_key(&trace_fsmonitor, "Truncate: mark (%"PRIu64",%"PRIu64")",
|
|
batch_marker->batch_seq_nr,
|
|
(uint64_t)batch_marker->pinned_time);
|
|
|
|
for (batch = batch_marker; batch; batch = batch->next) {
|
|
time_t t;
|
|
|
|
if (!batch->pinned_time) /* an overflow batch */
|
|
continue;
|
|
|
|
t = batch->pinned_time + MY_TIME_DELAY_SECONDS;
|
|
if (t > batch_marker->pinned_time) /* too close to marker */
|
|
continue;
|
|
|
|
goto truncate_past_here;
|
|
}
|
|
|
|
return NULL;
|
|
|
|
truncate_past_here:
|
|
state->current_token_data->batch_tail = (struct fsmonitor_batch *)batch;
|
|
|
|
remainder = ((struct fsmonitor_batch *)batch)->next;
|
|
((struct fsmonitor_batch *)batch)->next = NULL;
|
|
|
|
return remainder;
|
|
}
|
|
|
|
static void fsmonitor_free_token_data(struct fsmonitor_token_data *token)
|
|
{
|
|
if (!token)
|
|
return;
|
|
|
|
assert(token->client_ref_count == 0);
|
|
|
|
strbuf_release(&token->token_id);
|
|
|
|
fsmonitor_batch__free_list(token->batch_head);
|
|
|
|
free(token);
|
|
}
|
|
|
|
/*
|
|
* Flush all of our cached data about the filesystem. Call this if we
|
|
* lose sync with the filesystem and miss some notification events.
|
|
*
|
|
* [1] If we are missing events, then we no longer have a complete
|
|
* history of the directory (relative to our current start token).
|
|
* We should create a new token and start fresh (as if we just
|
|
* booted up).
|
|
*
|
|
* [2] Some of those lost events may have been for cookie files. We
|
|
* should assume the worst and abort them rather letting them starve.
|
|
*
|
|
* If there are no concurrent threads reading the current token data
|
|
* series, we can free it now. Otherwise, let the last reader free
|
|
* it.
|
|
*
|
|
* Either way, the old token data series is no longer associated with
|
|
* our state data.
|
|
*/
|
|
static void with_lock__do_force_resync(struct fsmonitor_daemon_state *state)
|
|
{
|
|
/* assert current thread holding state->main_lock */
|
|
|
|
struct fsmonitor_token_data *free_me = NULL;
|
|
struct fsmonitor_token_data *new_one = NULL;
|
|
|
|
new_one = fsmonitor_new_token_data();
|
|
|
|
if (state->current_token_data->client_ref_count == 0)
|
|
free_me = state->current_token_data;
|
|
state->current_token_data = new_one;
|
|
|
|
fsmonitor_free_token_data(free_me);
|
|
|
|
with_lock__abort_all_cookies(state);
|
|
}
|
|
|
|
void fsmonitor_force_resync(struct fsmonitor_daemon_state *state)
|
|
{
|
|
pthread_mutex_lock(&state->main_lock);
|
|
with_lock__do_force_resync(state);
|
|
pthread_mutex_unlock(&state->main_lock);
|
|
}
|
|
|
|
/*
|
|
* Format an opaque token string to send to the client.
|
|
*/
|
|
static void with_lock__format_response_token(
|
|
struct strbuf *response_token,
|
|
const struct strbuf *response_token_id,
|
|
const struct fsmonitor_batch *batch)
|
|
{
|
|
/* assert current thread holding state->main_lock */
|
|
|
|
strbuf_reset(response_token);
|
|
strbuf_addf(response_token, "builtin:%s:%"PRIu64,
|
|
response_token_id->buf, batch->batch_seq_nr);
|
|
}
|
|
|
|
/*
|
|
* Parse an opaque token from the client.
|
|
* Returns -1 on error.
|
|
*/
|
|
static int fsmonitor_parse_client_token(const char *buf_token,
|
|
struct strbuf *requested_token_id,
|
|
uint64_t *seq_nr)
|
|
{
|
|
const char *p;
|
|
char *p_end;
|
|
|
|
strbuf_reset(requested_token_id);
|
|
*seq_nr = 0;
|
|
|
|
if (!skip_prefix(buf_token, "builtin:", &p))
|
|
return -1;
|
|
|
|
while (*p && *p != ':')
|
|
strbuf_addch(requested_token_id, *p++);
|
|
if (!*p++)
|
|
return -1;
|
|
|
|
*seq_nr = (uint64_t)strtoumax(p, &p_end, 10);
|
|
if (*p_end)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
KHASH_INIT(str, const char *, int, 0, kh_str_hash_func, kh_str_hash_equal)
|
|
|
|
static int do_handle_client(struct fsmonitor_daemon_state *state,
|
|
const char *command,
|
|
ipc_server_reply_cb *reply,
|
|
struct ipc_server_reply_data *reply_data)
|
|
{
|
|
struct fsmonitor_token_data *token_data = NULL;
|
|
struct strbuf response_token = STRBUF_INIT;
|
|
struct strbuf requested_token_id = STRBUF_INIT;
|
|
struct strbuf payload = STRBUF_INIT;
|
|
uint64_t requested_oldest_seq_nr = 0;
|
|
uint64_t total_response_len = 0;
|
|
const char *p;
|
|
const struct fsmonitor_batch *batch_head;
|
|
const struct fsmonitor_batch *batch;
|
|
struct fsmonitor_batch *remainder = NULL;
|
|
intmax_t count = 0, duplicates = 0;
|
|
kh_str_t *shown;
|
|
int hash_ret;
|
|
int do_trivial = 0;
|
|
int do_flush = 0;
|
|
int do_cookie = 0;
|
|
enum fsmonitor_cookie_item_result cookie_result;
|
|
|
|
/*
|
|
* We expect `command` to be of the form:
|
|
*
|
|
* <command> := quit NUL
|
|
* | flush NUL
|
|
* | <V1-time-since-epoch-ns> NUL
|
|
* | <V2-opaque-fsmonitor-token> NUL
|
|
*/
|
|
|
|
if (!strcmp(command, "quit")) {
|
|
/*
|
|
* A client has requested over the socket/pipe that the
|
|
* daemon shutdown.
|
|
*
|
|
* Tell the IPC thread pool to shutdown (which completes
|
|
* the await in the main thread (which can stop the
|
|
* fsmonitor listener thread)).
|
|
*
|
|
* There is no reply to the client.
|
|
*/
|
|
return SIMPLE_IPC_QUIT;
|
|
|
|
} else if (!strcmp(command, "flush")) {
|
|
/*
|
|
* Flush all of our cached data and generate a new token
|
|
* just like if we lost sync with the filesystem.
|
|
*
|
|
* Then send a trivial response using the new token.
|
|
*/
|
|
do_flush = 1;
|
|
do_trivial = 1;
|
|
|
|
} else if (!skip_prefix(command, "builtin:", &p)) {
|
|
/* assume V1 timestamp or garbage */
|
|
|
|
char *p_end;
|
|
|
|
strtoumax(command, &p_end, 10);
|
|
trace_printf_key(&trace_fsmonitor,
|
|
((*p_end) ?
|
|
"fsmonitor: invalid command line '%s'" :
|
|
"fsmonitor: unsupported V1 protocol '%s'"),
|
|
command);
|
|
do_trivial = 1;
|
|
do_cookie = 1;
|
|
|
|
} else {
|
|
/* We have "builtin:*" */
|
|
if (fsmonitor_parse_client_token(command, &requested_token_id,
|
|
&requested_oldest_seq_nr)) {
|
|
trace_printf_key(&trace_fsmonitor,
|
|
"fsmonitor: invalid V2 protocol token '%s'",
|
|
command);
|
|
do_trivial = 1;
|
|
do_cookie = 1;
|
|
|
|
} else {
|
|
/*
|
|
* We have a V2 valid token:
|
|
* "builtin:<token_id>:<seq_nr>"
|
|
*/
|
|
do_cookie = 1;
|
|
}
|
|
}
|
|
|
|
pthread_mutex_lock(&state->main_lock);
|
|
|
|
if (!state->current_token_data)
|
|
BUG("fsmonitor state does not have a current token");
|
|
|
|
/*
|
|
* Write a cookie file inside the directory being watched in
|
|
* an effort to flush out existing filesystem events that we
|
|
* actually care about. Suspend this client thread until we
|
|
* see the filesystem events for this cookie file.
|
|
*
|
|
* Creating the cookie lets us guarantee that our FS listener
|
|
* thread has drained the kernel queue and we are caught up
|
|
* with the kernel.
|
|
*
|
|
* If we cannot create the cookie (or otherwise guarantee that
|
|
* we are caught up), we send a trivial response. We have to
|
|
* assume that there might be some very, very recent activity
|
|
* on the FS still in flight.
|
|
*/
|
|
if (do_cookie) {
|
|
cookie_result = with_lock__wait_for_cookie(state);
|
|
if (cookie_result != FCIR_SEEN) {
|
|
error(_("fsmonitor: cookie_result '%d' != SEEN"),
|
|
cookie_result);
|
|
do_trivial = 1;
|
|
}
|
|
}
|
|
|
|
if (do_flush)
|
|
with_lock__do_force_resync(state);
|
|
|
|
/*
|
|
* We mark the current head of the batch list as "pinned" so
|
|
* that the listener thread will treat this item as read-only
|
|
* (and prevent any more paths from being added to it) from
|
|
* now on.
|
|
*/
|
|
token_data = state->current_token_data;
|
|
batch_head = token_data->batch_head;
|
|
((struct fsmonitor_batch *)batch_head)->pinned_time = time(NULL);
|
|
|
|
/*
|
|
* FSMonitor Protocol V2 requires that we send a response header
|
|
* with a "new current token" and then all of the paths that changed
|
|
* since the "requested token". We send the seq_nr of the just-pinned
|
|
* head batch so that future requests from a client will be relative
|
|
* to it.
|
|
*/
|
|
with_lock__format_response_token(&response_token,
|
|
&token_data->token_id, batch_head);
|
|
|
|
reply(reply_data, response_token.buf, response_token.len + 1);
|
|
total_response_len += response_token.len + 1;
|
|
|
|
trace2_data_string("fsmonitor", the_repository, "response/token",
|
|
response_token.buf);
|
|
trace_printf_key(&trace_fsmonitor, "response token: %s",
|
|
response_token.buf);
|
|
|
|
if (!do_trivial) {
|
|
if (strcmp(requested_token_id.buf, token_data->token_id.buf)) {
|
|
/*
|
|
* The client last spoke to a different daemon
|
|
* instance -OR- the daemon had to resync with
|
|
* the filesystem (and lost events), so reject.
|
|
*/
|
|
trace2_data_string("fsmonitor", the_repository,
|
|
"response/token", "different");
|
|
do_trivial = 1;
|
|
|
|
} else if (requested_oldest_seq_nr <
|
|
token_data->batch_tail->batch_seq_nr) {
|
|
/*
|
|
* The client wants older events than we have for
|
|
* this token_id. This means that the end of our
|
|
* batch list was truncated and we cannot give the
|
|
* client a complete snapshot relative to their
|
|
* request.
|
|
*/
|
|
trace_printf_key(&trace_fsmonitor,
|
|
"client requested truncated data");
|
|
do_trivial = 1;
|
|
}
|
|
}
|
|
|
|
if (do_trivial) {
|
|
pthread_mutex_unlock(&state->main_lock);
|
|
|
|
reply(reply_data, "/", 2);
|
|
|
|
trace2_data_intmax("fsmonitor", the_repository,
|
|
"response/trivial", 1);
|
|
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* We're going to hold onto a pointer to the current
|
|
* token-data while we walk the list of batches of files.
|
|
* During this time, we will NOT be under the lock.
|
|
* So we ref-count it.
|
|
*
|
|
* This allows the listener thread to continue prepending
|
|
* new batches of items to the token-data (which we'll ignore).
|
|
*
|
|
* AND it allows the listener thread to do a token-reset
|
|
* (and install a new `current_token_data`).
|
|
*/
|
|
token_data->client_ref_count++;
|
|
|
|
pthread_mutex_unlock(&state->main_lock);
|
|
|
|
/*
|
|
* The client request is relative to the token that they sent,
|
|
* so walk the batch list backwards from the current head back
|
|
* to the batch (sequence number) they named.
|
|
*
|
|
* We use khash to de-dup the list of pathnames.
|
|
*
|
|
* NEEDSWORK: each batch contains a list of interned strings,
|
|
* so we only need to do pointer comparisons here to build the
|
|
* hash table. Currently, we're still comparing the string
|
|
* values.
|
|
*/
|
|
shown = kh_init_str();
|
|
for (batch = batch_head;
|
|
batch && batch->batch_seq_nr > requested_oldest_seq_nr;
|
|
batch = batch->next) {
|
|
size_t k;
|
|
|
|
for (k = 0; k < batch->nr; k++) {
|
|
const char *s = batch->interned_paths[k];
|
|
size_t s_len;
|
|
|
|
if (kh_get_str(shown, s) != kh_end(shown))
|
|
duplicates++;
|
|
else {
|
|
kh_put_str(shown, s, &hash_ret);
|
|
|
|
trace_printf_key(&trace_fsmonitor,
|
|
"send[%"PRIuMAX"]: %s",
|
|
count, s);
|
|
|
|
/* Each path gets written with a trailing NUL */
|
|
s_len = strlen(s) + 1;
|
|
|
|
if (payload.len + s_len >=
|
|
LARGE_PACKET_DATA_MAX) {
|
|
reply(reply_data, payload.buf,
|
|
payload.len);
|
|
total_response_len += payload.len;
|
|
strbuf_reset(&payload);
|
|
}
|
|
|
|
strbuf_add(&payload, s, s_len);
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (payload.len) {
|
|
reply(reply_data, payload.buf, payload.len);
|
|
total_response_len += payload.len;
|
|
}
|
|
|
|
kh_release_str(shown);
|
|
|
|
pthread_mutex_lock(&state->main_lock);
|
|
|
|
if (token_data->client_ref_count > 0)
|
|
token_data->client_ref_count--;
|
|
|
|
if (token_data->client_ref_count == 0) {
|
|
if (token_data != state->current_token_data) {
|
|
/*
|
|
* The listener thread did a token-reset while we were
|
|
* walking the batch list. Therefore, this token is
|
|
* stale and can be discarded completely. If we are
|
|
* the last reader thread using this token, we own
|
|
* that work.
|
|
*/
|
|
fsmonitor_free_token_data(token_data);
|
|
} else if (batch) {
|
|
/*
|
|
* We are holding the lock and are the only
|
|
* reader of the ref-counted portion of the
|
|
* list, so we get the honor of seeing if the
|
|
* list can be truncated to save memory.
|
|
*
|
|
* The main loop did not walk to the end of the
|
|
* list, so this batch is the first item in the
|
|
* batch-list that is older than the requested
|
|
* end-point sequence number. See if the tail
|
|
* end of the list is obsolete.
|
|
*/
|
|
remainder = with_lock__truncate_old_batches(state,
|
|
batch);
|
|
}
|
|
}
|
|
|
|
pthread_mutex_unlock(&state->main_lock);
|
|
|
|
if (remainder)
|
|
fsmonitor_batch__free_list(remainder);
|
|
|
|
trace2_data_intmax("fsmonitor", the_repository, "response/length", total_response_len);
|
|
trace2_data_intmax("fsmonitor", the_repository, "response/count/files", count);
|
|
trace2_data_intmax("fsmonitor", the_repository, "response/count/duplicates", duplicates);
|
|
|
|
cleanup:
|
|
strbuf_release(&response_token);
|
|
strbuf_release(&requested_token_id);
|
|
strbuf_release(&payload);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ipc_server_application_cb handle_client;
|
|
|
|
static int handle_client(void *data,
|
|
const char *command, size_t command_len,
|
|
ipc_server_reply_cb *reply,
|
|
struct ipc_server_reply_data *reply_data)
|
|
{
|
|
struct fsmonitor_daemon_state *state = data;
|
|
int result;
|
|
|
|
/*
|
|
* The Simple IPC API now supports {char*, len} arguments, but
|
|
* FSMonitor always uses proper null-terminated strings, so
|
|
* we can ignore the command_len argument. (Trust, but verify.)
|
|
*/
|
|
if (command_len != strlen(command))
|
|
BUG("FSMonitor assumes text messages");
|
|
|
|
trace_printf_key(&trace_fsmonitor, "requested token: %s", command);
|
|
|
|
trace2_region_enter("fsmonitor", "handle_client", the_repository);
|
|
trace2_data_string("fsmonitor", the_repository, "request", command);
|
|
|
|
result = do_handle_client(state, command, reply, reply_data);
|
|
|
|
trace2_region_leave("fsmonitor", "handle_client", the_repository);
|
|
|
|
return result;
|
|
}
|
|
|
|
#define FSMONITOR_DIR "fsmonitor--daemon"
|
|
#define FSMONITOR_COOKIE_DIR "cookies"
|
|
#define FSMONITOR_COOKIE_PREFIX (FSMONITOR_DIR "/" FSMONITOR_COOKIE_DIR "/")
|
|
|
|
enum fsmonitor_path_type fsmonitor_classify_path_workdir_relative(
|
|
const char *rel)
|
|
{
|
|
if (fspathncmp(rel, ".git", 4))
|
|
return IS_WORKDIR_PATH;
|
|
rel += 4;
|
|
|
|
if (!*rel)
|
|
return IS_DOT_GIT;
|
|
if (*rel != '/')
|
|
return IS_WORKDIR_PATH; /* e.g. .gitignore */
|
|
rel++;
|
|
|
|
if (!fspathncmp(rel, FSMONITOR_COOKIE_PREFIX,
|
|
strlen(FSMONITOR_COOKIE_PREFIX)))
|
|
return IS_INSIDE_DOT_GIT_WITH_COOKIE_PREFIX;
|
|
|
|
return IS_INSIDE_DOT_GIT;
|
|
}
|
|
|
|
enum fsmonitor_path_type fsmonitor_classify_path_gitdir_relative(
|
|
const char *rel)
|
|
{
|
|
if (!fspathncmp(rel, FSMONITOR_COOKIE_PREFIX,
|
|
strlen(FSMONITOR_COOKIE_PREFIX)))
|
|
return IS_INSIDE_GITDIR_WITH_COOKIE_PREFIX;
|
|
|
|
return IS_INSIDE_GITDIR;
|
|
}
|
|
|
|
static enum fsmonitor_path_type try_classify_workdir_abs_path(
|
|
struct fsmonitor_daemon_state *state,
|
|
const char *path)
|
|
{
|
|
const char *rel;
|
|
|
|
if (fspathncmp(path, state->path_worktree_watch.buf,
|
|
state->path_worktree_watch.len))
|
|
return IS_OUTSIDE_CONE;
|
|
|
|
rel = path + state->path_worktree_watch.len;
|
|
|
|
if (!*rel)
|
|
return IS_WORKDIR_PATH; /* it is the root dir exactly */
|
|
if (*rel != '/')
|
|
return IS_OUTSIDE_CONE;
|
|
rel++;
|
|
|
|
return fsmonitor_classify_path_workdir_relative(rel);
|
|
}
|
|
|
|
enum fsmonitor_path_type fsmonitor_classify_path_absolute(
|
|
struct fsmonitor_daemon_state *state,
|
|
const char *path)
|
|
{
|
|
const char *rel;
|
|
enum fsmonitor_path_type t;
|
|
|
|
t = try_classify_workdir_abs_path(state, path);
|
|
if (state->nr_paths_watching == 1)
|
|
return t;
|
|
if (t != IS_OUTSIDE_CONE)
|
|
return t;
|
|
|
|
if (fspathncmp(path, state->path_gitdir_watch.buf,
|
|
state->path_gitdir_watch.len))
|
|
return IS_OUTSIDE_CONE;
|
|
|
|
rel = path + state->path_gitdir_watch.len;
|
|
|
|
if (!*rel)
|
|
return IS_GITDIR; /* it is the <gitdir> exactly */
|
|
if (*rel != '/')
|
|
return IS_OUTSIDE_CONE;
|
|
rel++;
|
|
|
|
return fsmonitor_classify_path_gitdir_relative(rel);
|
|
}
|
|
|
|
/*
|
|
* We try to combine small batches at the front of the batch-list to avoid
|
|
* having a long list. This hopefully makes it a little easier when we want
|
|
* to truncate and maintain the list. However, we don't want the paths array
|
|
* to just keep growing and growing with realloc, so we insert an arbitrary
|
|
* limit.
|
|
*/
|
|
#define MY_COMBINE_LIMIT (1024)
|
|
|
|
void fsmonitor_publish(struct fsmonitor_daemon_state *state,
|
|
struct fsmonitor_batch *batch,
|
|
const struct string_list *cookie_names)
|
|
{
|
|
if (!batch && !cookie_names->nr)
|
|
return;
|
|
|
|
pthread_mutex_lock(&state->main_lock);
|
|
|
|
if (batch) {
|
|
struct fsmonitor_batch *head;
|
|
|
|
head = state->current_token_data->batch_head;
|
|
if (!head) {
|
|
BUG("token does not have batch");
|
|
} else if (head->pinned_time) {
|
|
/*
|
|
* We cannot alter the current batch list
|
|
* because:
|
|
*
|
|
* [a] it is being transmitted to at least one
|
|
* client and the handle_client() thread has a
|
|
* ref-count, but not a lock on the batch list
|
|
* starting with this item.
|
|
*
|
|
* [b] it has been transmitted in the past to
|
|
* at least one client such that future
|
|
* requests are relative to this head batch.
|
|
*
|
|
* So, we can only prepend a new batch onto
|
|
* the front of the list.
|
|
*/
|
|
batch->batch_seq_nr = head->batch_seq_nr + 1;
|
|
batch->next = head;
|
|
state->current_token_data->batch_head = batch;
|
|
} else if (!head->batch_seq_nr) {
|
|
/*
|
|
* Batch 0 is unpinned. See the note in
|
|
* `fsmonitor_new_token_data()` about why we
|
|
* don't need to accumulate these paths.
|
|
*/
|
|
fsmonitor_batch__free_list(batch);
|
|
} else if (head->nr + batch->nr > MY_COMBINE_LIMIT) {
|
|
/*
|
|
* The head batch in the list has never been
|
|
* transmitted to a client, but folding the
|
|
* contents of the new batch onto it would
|
|
* exceed our arbitrary limit, so just prepend
|
|
* the new batch onto the list.
|
|
*/
|
|
batch->batch_seq_nr = head->batch_seq_nr + 1;
|
|
batch->next = head;
|
|
state->current_token_data->batch_head = batch;
|
|
} else {
|
|
/*
|
|
* We are free to add the paths in the given
|
|
* batch onto the end of the current head batch.
|
|
*/
|
|
fsmonitor_batch__combine(head, batch);
|
|
fsmonitor_batch__free_list(batch);
|
|
}
|
|
}
|
|
|
|
if (cookie_names->nr)
|
|
with_lock__mark_cookies_seen(state, cookie_names);
|
|
|
|
pthread_mutex_unlock(&state->main_lock);
|
|
}
|
|
|
|
static void *fsm_health__thread_proc(void *_state)
|
|
{
|
|
struct fsmonitor_daemon_state *state = _state;
|
|
|
|
trace2_thread_start("fsm-health");
|
|
|
|
fsm_health__loop(state);
|
|
|
|
trace2_thread_exit();
|
|
return NULL;
|
|
}
|
|
|
|
static void *fsm_listen__thread_proc(void *_state)
|
|
{
|
|
struct fsmonitor_daemon_state *state = _state;
|
|
|
|
trace2_thread_start("fsm-listen");
|
|
|
|
trace_printf_key(&trace_fsmonitor, "Watching: worktree '%s'",
|
|
state->path_worktree_watch.buf);
|
|
if (state->nr_paths_watching > 1)
|
|
trace_printf_key(&trace_fsmonitor, "Watching: gitdir '%s'",
|
|
state->path_gitdir_watch.buf);
|
|
|
|
fsm_listen__loop(state);
|
|
|
|
pthread_mutex_lock(&state->main_lock);
|
|
if (state->current_token_data &&
|
|
state->current_token_data->client_ref_count == 0)
|
|
fsmonitor_free_token_data(state->current_token_data);
|
|
state->current_token_data = NULL;
|
|
pthread_mutex_unlock(&state->main_lock);
|
|
|
|
trace2_thread_exit();
|
|
return NULL;
|
|
}
|
|
|
|
static int fsmonitor_run_daemon_1(struct fsmonitor_daemon_state *state)
|
|
{
|
|
struct ipc_server_opts ipc_opts = {
|
|
.nr_threads = fsmonitor__ipc_threads,
|
|
|
|
/*
|
|
* We know that there are no other active threads yet,
|
|
* so we can let the IPC layer temporarily chdir() if
|
|
* it needs to when creating the server side of the
|
|
* Unix domain socket.
|
|
*/
|
|
.uds_disallow_chdir = 0
|
|
};
|
|
int health_started = 0;
|
|
int listener_started = 0;
|
|
int err = 0;
|
|
|
|
/*
|
|
* Start the IPC thread pool before the we've started the file
|
|
* system event listener thread so that we have the IPC handle
|
|
* before we need it.
|
|
*/
|
|
if (ipc_server_run_async(&state->ipc_server_data,
|
|
state->path_ipc.buf, &ipc_opts,
|
|
handle_client, state))
|
|
return error_errno(
|
|
_("could not start IPC thread pool on '%s'"),
|
|
state->path_ipc.buf);
|
|
|
|
/*
|
|
* Start the fsmonitor listener thread to collect filesystem
|
|
* events.
|
|
*/
|
|
if (pthread_create(&state->listener_thread, NULL,
|
|
fsm_listen__thread_proc, state)) {
|
|
ipc_server_stop_async(state->ipc_server_data);
|
|
err = error(_("could not start fsmonitor listener thread"));
|
|
goto cleanup;
|
|
}
|
|
listener_started = 1;
|
|
|
|
/*
|
|
* Start the health thread to watch over our process.
|
|
*/
|
|
if (pthread_create(&state->health_thread, NULL,
|
|
fsm_health__thread_proc, state)) {
|
|
ipc_server_stop_async(state->ipc_server_data);
|
|
err = error(_("could not start fsmonitor health thread"));
|
|
goto cleanup;
|
|
}
|
|
health_started = 1;
|
|
|
|
/*
|
|
* The daemon is now fully functional in background threads.
|
|
* Our primary thread should now just wait while the threads
|
|
* do all the work.
|
|
*/
|
|
cleanup:
|
|
/*
|
|
* Wait for the IPC thread pool to shutdown (whether by client
|
|
* request, from filesystem activity, or an error).
|
|
*/
|
|
ipc_server_await(state->ipc_server_data);
|
|
|
|
/*
|
|
* The fsmonitor listener thread may have received a shutdown
|
|
* event from the IPC thread pool, but it doesn't hurt to tell
|
|
* it again. And wait for it to shutdown.
|
|
*/
|
|
if (listener_started) {
|
|
fsm_listen__stop_async(state);
|
|
pthread_join(state->listener_thread, NULL);
|
|
}
|
|
|
|
if (health_started) {
|
|
fsm_health__stop_async(state);
|
|
pthread_join(state->health_thread, NULL);
|
|
}
|
|
|
|
if (err)
|
|
return err;
|
|
if (state->listen_error_code)
|
|
return state->listen_error_code;
|
|
if (state->health_error_code)
|
|
return state->health_error_code;
|
|
return 0;
|
|
}
|
|
|
|
static int fsmonitor_run_daemon(void)
|
|
{
|
|
struct fsmonitor_daemon_state state;
|
|
const char *home;
|
|
int err;
|
|
|
|
memset(&state, 0, sizeof(state));
|
|
|
|
hashmap_init(&state.cookies, cookies_cmp, NULL, 0);
|
|
pthread_mutex_init(&state.main_lock, NULL);
|
|
pthread_cond_init(&state.cookies_cond, NULL);
|
|
state.listen_error_code = 0;
|
|
state.health_error_code = 0;
|
|
state.current_token_data = fsmonitor_new_token_data();
|
|
|
|
/* Prepare to (recursively) watch the <worktree-root> directory. */
|
|
strbuf_init(&state.path_worktree_watch, 0);
|
|
strbuf_addstr(&state.path_worktree_watch, absolute_path(get_git_work_tree()));
|
|
state.nr_paths_watching = 1;
|
|
|
|
strbuf_init(&state.alias.alias, 0);
|
|
strbuf_init(&state.alias.points_to, 0);
|
|
if ((err = fsmonitor__get_alias(state.path_worktree_watch.buf, &state.alias)))
|
|
goto done;
|
|
|
|
/*
|
|
* We create and delete cookie files somewhere inside the .git
|
|
* directory to help us keep sync with the file system. If
|
|
* ".git" is not a directory, then <gitdir> is not inside the
|
|
* cone of <worktree-root>, so set up a second watch to watch
|
|
* the <gitdir> so that we get events for the cookie files.
|
|
*/
|
|
strbuf_init(&state.path_gitdir_watch, 0);
|
|
strbuf_addbuf(&state.path_gitdir_watch, &state.path_worktree_watch);
|
|
strbuf_addstr(&state.path_gitdir_watch, "/.git");
|
|
if (!is_directory(state.path_gitdir_watch.buf)) {
|
|
strbuf_reset(&state.path_gitdir_watch);
|
|
strbuf_addstr(&state.path_gitdir_watch, absolute_path(get_git_dir()));
|
|
state.nr_paths_watching = 2;
|
|
}
|
|
|
|
/*
|
|
* We will write filesystem syncing cookie files into
|
|
* <gitdir>/<fsmonitor-dir>/<cookie-dir>/<pid>-<seq>.
|
|
*
|
|
* The extra layers of subdirectories here keep us from
|
|
* changing the mtime on ".git/" or ".git/foo/" when we create
|
|
* or delete cookie files.
|
|
*
|
|
* There have been problems with some IDEs that do a
|
|
* non-recursive watch of the ".git/" directory and run a
|
|
* series of commands any time something happens.
|
|
*
|
|
* For example, if we place our cookie files directly in
|
|
* ".git/" or ".git/foo/" then a `git status` (or similar
|
|
* command) from the IDE will cause a cookie file to be
|
|
* created in one of those dirs. This causes the mtime of
|
|
* those dirs to change. This triggers the IDE's watch
|
|
* notification. This triggers the IDE to run those commands
|
|
* again. And the process repeats and the machine never goes
|
|
* idle.
|
|
*
|
|
* Adding the extra layers of subdirectories prevents the
|
|
* mtime of ".git/" and ".git/foo" from changing when a
|
|
* cookie file is created.
|
|
*/
|
|
strbuf_init(&state.path_cookie_prefix, 0);
|
|
strbuf_addbuf(&state.path_cookie_prefix, &state.path_gitdir_watch);
|
|
|
|
strbuf_addch(&state.path_cookie_prefix, '/');
|
|
strbuf_addstr(&state.path_cookie_prefix, FSMONITOR_DIR);
|
|
mkdir(state.path_cookie_prefix.buf, 0777);
|
|
|
|
strbuf_addch(&state.path_cookie_prefix, '/');
|
|
strbuf_addstr(&state.path_cookie_prefix, FSMONITOR_COOKIE_DIR);
|
|
mkdir(state.path_cookie_prefix.buf, 0777);
|
|
|
|
strbuf_addch(&state.path_cookie_prefix, '/');
|
|
|
|
/*
|
|
* We create a named-pipe or unix domain socket inside of the
|
|
* ".git" directory. (Well, on Windows, we base our named
|
|
* pipe in the NPFS on the absolute path of the git
|
|
* directory.)
|
|
*/
|
|
strbuf_init(&state.path_ipc, 0);
|
|
strbuf_addstr(&state.path_ipc,
|
|
absolute_path(fsmonitor_ipc__get_path(the_repository)));
|
|
|
|
/*
|
|
* Confirm that we can create platform-specific resources for the
|
|
* filesystem listener before we bother starting all the threads.
|
|
*/
|
|
if (fsm_listen__ctor(&state)) {
|
|
err = error(_("could not initialize listener thread"));
|
|
goto done;
|
|
}
|
|
|
|
if (fsm_health__ctor(&state)) {
|
|
err = error(_("could not initialize health thread"));
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* CD out of the worktree root directory.
|
|
*
|
|
* The common Git startup mechanism causes our CWD to be the
|
|
* root of the worktree. On Windows, this causes our process
|
|
* to hold a locked handle on the CWD. This prevents the
|
|
* worktree from being moved or deleted while the daemon is
|
|
* running.
|
|
*
|
|
* We assume that our FS and IPC listener threads have either
|
|
* opened all of the handles that they need or will do
|
|
* everything using absolute paths.
|
|
*/
|
|
home = getenv("HOME");
|
|
if (home && *home && chdir(home))
|
|
die_errno(_("could not cd home '%s'"), home);
|
|
|
|
err = fsmonitor_run_daemon_1(&state);
|
|
|
|
done:
|
|
pthread_cond_destroy(&state.cookies_cond);
|
|
pthread_mutex_destroy(&state.main_lock);
|
|
fsm_listen__dtor(&state);
|
|
fsm_health__dtor(&state);
|
|
|
|
ipc_server_free(state.ipc_server_data);
|
|
|
|
strbuf_release(&state.path_worktree_watch);
|
|
strbuf_release(&state.path_gitdir_watch);
|
|
strbuf_release(&state.path_cookie_prefix);
|
|
strbuf_release(&state.path_ipc);
|
|
strbuf_release(&state.alias.alias);
|
|
strbuf_release(&state.alias.points_to);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int try_to_run_foreground_daemon(int detach_console)
|
|
{
|
|
/*
|
|
* Technically, we don't need to probe for an existing daemon
|
|
* process, since we could just call `fsmonitor_run_daemon()`
|
|
* and let it fail if the pipe/socket is busy.
|
|
*
|
|
* However, this method gives us a nicer error message for a
|
|
* common error case.
|
|
*/
|
|
if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
|
|
die(_("fsmonitor--daemon is already running '%s'"),
|
|
the_repository->worktree);
|
|
|
|
if (fsmonitor__announce_startup) {
|
|
fprintf(stderr, _("running fsmonitor-daemon in '%s'\n"),
|
|
the_repository->worktree);
|
|
fflush(stderr);
|
|
}
|
|
|
|
#ifdef GIT_WINDOWS_NATIVE
|
|
if (detach_console)
|
|
FreeConsole();
|
|
#endif
|
|
|
|
return !!fsmonitor_run_daemon();
|
|
}
|
|
|
|
static start_bg_wait_cb bg_wait_cb;
|
|
|
|
static int bg_wait_cb(const struct child_process *cp, void *cb_data)
|
|
{
|
|
enum ipc_active_state s = fsmonitor_ipc__get_state();
|
|
|
|
switch (s) {
|
|
case IPC_STATE__LISTENING:
|
|
/* child is "ready" */
|
|
return 0;
|
|
|
|
case IPC_STATE__NOT_LISTENING:
|
|
case IPC_STATE__PATH_NOT_FOUND:
|
|
/* give child more time */
|
|
return 1;
|
|
|
|
default:
|
|
case IPC_STATE__INVALID_PATH:
|
|
case IPC_STATE__OTHER_ERROR:
|
|
/* all the time in world won't help */
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int try_to_start_background_daemon(void)
|
|
{
|
|
struct child_process cp = CHILD_PROCESS_INIT;
|
|
enum start_bg_result sbgr;
|
|
|
|
/*
|
|
* Before we try to create a background daemon process, see
|
|
* if a daemon process is already listening. This makes it
|
|
* easier for us to report an already-listening error to the
|
|
* console, since our spawn/daemon can only report the success
|
|
* of creating the background process (and not whether it
|
|
* immediately exited).
|
|
*/
|
|
if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
|
|
die(_("fsmonitor--daemon is already running '%s'"),
|
|
the_repository->worktree);
|
|
|
|
if (fsmonitor__announce_startup) {
|
|
fprintf(stderr, _("starting fsmonitor-daemon in '%s'\n"),
|
|
the_repository->worktree);
|
|
fflush(stderr);
|
|
}
|
|
|
|
cp.git_cmd = 1;
|
|
|
|
strvec_push(&cp.args, "fsmonitor--daemon");
|
|
strvec_push(&cp.args, "run");
|
|
strvec_push(&cp.args, "--detach");
|
|
strvec_pushf(&cp.args, "--ipc-threads=%d", fsmonitor__ipc_threads);
|
|
|
|
cp.no_stdin = 1;
|
|
cp.no_stdout = 1;
|
|
cp.no_stderr = 1;
|
|
|
|
sbgr = start_bg_command(&cp, bg_wait_cb, NULL,
|
|
fsmonitor__start_timeout_sec);
|
|
|
|
switch (sbgr) {
|
|
case SBGR_READY:
|
|
return 0;
|
|
|
|
default:
|
|
case SBGR_ERROR:
|
|
case SBGR_CB_ERROR:
|
|
return error(_("daemon failed to start"));
|
|
|
|
case SBGR_TIMEOUT:
|
|
return error(_("daemon not online yet"));
|
|
|
|
case SBGR_DIED:
|
|
return error(_("daemon terminated"));
|
|
}
|
|
}
|
|
|
|
int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
|
|
{
|
|
const char *subcmd;
|
|
enum fsmonitor_reason reason;
|
|
int detach_console = 0;
|
|
|
|
struct option options[] = {
|
|
OPT_BOOL(0, "detach", &detach_console, N_("detach from console")),
|
|
OPT_INTEGER(0, "ipc-threads",
|
|
&fsmonitor__ipc_threads,
|
|
N_("use <n> ipc worker threads")),
|
|
OPT_INTEGER(0, "start-timeout",
|
|
&fsmonitor__start_timeout_sec,
|
|
N_("max seconds to wait for background daemon startup")),
|
|
|
|
OPT_END()
|
|
};
|
|
|
|
git_config(fsmonitor_config, NULL);
|
|
|
|
argc = parse_options(argc, argv, prefix, options,
|
|
builtin_fsmonitor__daemon_usage, 0);
|
|
if (argc != 1)
|
|
usage_with_options(builtin_fsmonitor__daemon_usage, options);
|
|
subcmd = argv[0];
|
|
|
|
if (fsmonitor__ipc_threads < 1)
|
|
die(_("invalid 'ipc-threads' value (%d)"),
|
|
fsmonitor__ipc_threads);
|
|
|
|
prepare_repo_settings(the_repository);
|
|
/*
|
|
* If the repo is fsmonitor-compatible, explicitly set IPC-mode
|
|
* (without bothering to load the `core.fsmonitor` config settings).
|
|
*
|
|
* If the repo is not compatible, the repo-settings will be set to
|
|
* incompatible rather than IPC, so we can use one of the __get
|
|
* routines to detect the discrepancy.
|
|
*/
|
|
fsm_settings__set_ipc(the_repository);
|
|
|
|
reason = fsm_settings__get_reason(the_repository);
|
|
if (reason > FSMONITOR_REASON_OK)
|
|
die("%s",
|
|
fsm_settings__get_incompatible_msg(the_repository,
|
|
reason));
|
|
|
|
if (!strcmp(subcmd, "start"))
|
|
return !!try_to_start_background_daemon();
|
|
|
|
if (!strcmp(subcmd, "run"))
|
|
return !!try_to_run_foreground_daemon(detach_console);
|
|
|
|
if (!strcmp(subcmd, "stop"))
|
|
return !!do_as_client__send_stop();
|
|
|
|
if (!strcmp(subcmd, "status"))
|
|
return !!do_as_client__status();
|
|
|
|
die(_("Unhandled subcommand '%s'"), subcmd);
|
|
}
|
|
|
|
#else
|
|
int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
|
|
{
|
|
struct option options[] = {
|
|
OPT_END()
|
|
};
|
|
|
|
if (argc == 2 && !strcmp(argv[1], "-h"))
|
|
usage_with_options(builtin_fsmonitor__daemon_usage, options);
|
|
|
|
die(_("fsmonitor--daemon not supported on this platform"));
|
|
}
|
|
#endif
|