diff options
Diffstat (limited to 'third_party/git/fsmonitor.c')
| -rw-r--r-- | third_party/git/fsmonitor.c | 362 |
1 files changed, 0 insertions, 362 deletions
diff --git a/third_party/git/fsmonitor.c b/third_party/git/fsmonitor.c deleted file mode 100644 index ca031c3abb8b..000000000000 --- a/third_party/git/fsmonitor.c +++ /dev/null @@ -1,362 +0,0 @@ -#include "cache.h" -#include "config.h" -#include "dir.h" -#include "ewah/ewok.h" -#include "fsmonitor.h" -#include "run-command.h" -#include "strbuf.h" - -#define INDEX_EXTENSION_VERSION1 (1) -#define INDEX_EXTENSION_VERSION2 (2) -#define HOOK_INTERFACE_VERSION1 (1) -#define HOOK_INTERFACE_VERSION2 (2) - -struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR); - -static void fsmonitor_ewah_callback(size_t pos, void *is) -{ - struct index_state *istate = (struct index_state *)is; - struct cache_entry *ce; - - if (pos >= istate->cache_nr) - BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" >= %u)", - (uintmax_t)pos, istate->cache_nr); - - ce = istate->cache[pos]; - ce->ce_flags &= ~CE_FSMONITOR_VALID; -} - -static int fsmonitor_hook_version(void) -{ - int hook_version; - - if (git_config_get_int("core.fsmonitorhookversion", &hook_version)) - return -1; - - if (hook_version == HOOK_INTERFACE_VERSION1 || - hook_version == HOOK_INTERFACE_VERSION2) - return hook_version; - - warning("Invalid hook version '%i' in core.fsmonitorhookversion. " - "Must be 1 or 2.", hook_version); - return -1; -} - -int read_fsmonitor_extension(struct index_state *istate, const void *data, - unsigned long sz) -{ - const char *index = data; - uint32_t hdr_version; - uint32_t ewah_size; - struct ewah_bitmap *fsmonitor_dirty; - int ret; - uint64_t timestamp; - struct strbuf last_update = STRBUF_INIT; - - if (sz < sizeof(uint32_t) + 1 + sizeof(uint32_t)) - return error("corrupt fsmonitor extension (too short)"); - - hdr_version = get_be32(index); - index += sizeof(uint32_t); - if (hdr_version == INDEX_EXTENSION_VERSION1) { - timestamp = get_be64(index); - strbuf_addf(&last_update, "%"PRIu64"", timestamp); - index += sizeof(uint64_t); - } else if (hdr_version == INDEX_EXTENSION_VERSION2) { - strbuf_addstr(&last_update, index); - index += last_update.len + 1; - } else { - return error("bad fsmonitor version %d", hdr_version); - } - - istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL); - - ewah_size = get_be32(index); - index += sizeof(uint32_t); - - fsmonitor_dirty = ewah_new(); - ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size); - if (ret != ewah_size) { - ewah_free(fsmonitor_dirty); - return error("failed to parse ewah bitmap reading fsmonitor index extension"); - } - istate->fsmonitor_dirty = fsmonitor_dirty; - - if (!istate->split_index && - istate->fsmonitor_dirty->bit_size > istate->cache_nr) - BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)", - (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr); - - trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful"); - return 0; -} - -void fill_fsmonitor_bitmap(struct index_state *istate) -{ - unsigned int i, skipped = 0; - istate->fsmonitor_dirty = ewah_new(); - for (i = 0; i < istate->cache_nr; i++) { - if (istate->cache[i]->ce_flags & CE_REMOVE) - skipped++; - else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID)) - ewah_set(istate->fsmonitor_dirty, i - skipped); - } -} - -void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate) -{ - uint32_t hdr_version; - uint32_t ewah_start; - uint32_t ewah_size = 0; - int fixup = 0; - - if (!istate->split_index && - istate->fsmonitor_dirty->bit_size > istate->cache_nr) - BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)", - (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr); - - put_be32(&hdr_version, INDEX_EXTENSION_VERSION2); - strbuf_add(sb, &hdr_version, sizeof(uint32_t)); - - strbuf_addstr(sb, istate->fsmonitor_last_update); - strbuf_addch(sb, 0); /* Want to keep a NUL */ - - fixup = sb->len; - strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */ - - ewah_start = sb->len; - ewah_serialize_strbuf(istate->fsmonitor_dirty, sb); - ewah_free(istate->fsmonitor_dirty); - istate->fsmonitor_dirty = NULL; - - /* fix up size field */ - put_be32(&ewah_size, sb->len - ewah_start); - memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t)); - - trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful"); -} - -/* - * Call the query-fsmonitor hook passing the last update token of the saved results. - */ -static int query_fsmonitor(int version, const char *last_update, struct strbuf *query_result) -{ - struct child_process cp = CHILD_PROCESS_INIT; - - if (!core_fsmonitor) - return -1; - - strvec_push(&cp.args, core_fsmonitor); - strvec_pushf(&cp.args, "%d", version); - strvec_pushf(&cp.args, "%s", last_update); - cp.use_shell = 1; - cp.dir = get_git_work_tree(); - - return capture_command(&cp, query_result, 1024); -} - -static void fsmonitor_refresh_callback(struct index_state *istate, const char *name) -{ - int pos = index_name_pos(istate, name, strlen(name)); - - if (pos >= 0) { - struct cache_entry *ce = istate->cache[pos]; - ce->ce_flags &= ~CE_FSMONITOR_VALID; - } - - /* - * Mark the untracked cache dirty even if it wasn't found in the index - * as it could be a new untracked file. - */ - trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name); - untracked_cache_invalidate_path(istate, name, 0); -} - -void refresh_fsmonitor(struct index_state *istate) -{ - struct strbuf query_result = STRBUF_INIT; - int query_success = 0, hook_version = -1; - size_t bol = 0; /* beginning of line */ - uint64_t last_update; - struct strbuf last_update_token = STRBUF_INIT; - char *buf; - unsigned int i; - - if (!core_fsmonitor || istate->fsmonitor_has_run_once) - return; - - hook_version = fsmonitor_hook_version(); - - istate->fsmonitor_has_run_once = 1; - - trace_printf_key(&trace_fsmonitor, "refresh fsmonitor"); - /* - * This could be racy so save the date/time now and query_fsmonitor - * should be inclusive to ensure we don't miss potential changes. - */ - last_update = getnanotime(); - if (hook_version == HOOK_INTERFACE_VERSION1) - strbuf_addf(&last_update_token, "%"PRIu64"", last_update); - - /* - * If we have a last update token, call query_fsmonitor for the set of - * changes since that token, else assume everything is possibly dirty - * and check it all. - */ - if (istate->fsmonitor_last_update) { - if (hook_version == -1 || hook_version == HOOK_INTERFACE_VERSION2) { - query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION2, - istate->fsmonitor_last_update, &query_result); - - if (query_success) { - if (hook_version < 0) - hook_version = HOOK_INTERFACE_VERSION2; - - /* - * First entry will be the last update token - * Need to use a char * variable because static - * analysis was suggesting to use strbuf_addbuf - * but we don't want to copy the entire strbuf - * only the chars up to the first NUL - */ - buf = query_result.buf; - strbuf_addstr(&last_update_token, buf); - if (!last_update_token.len) { - warning("Empty last update token."); - query_success = 0; - } else { - bol = last_update_token.len + 1; - } - } else if (hook_version < 0) { - hook_version = HOOK_INTERFACE_VERSION1; - if (!last_update_token.len) - strbuf_addf(&last_update_token, "%"PRIu64"", last_update); - } - } - - if (hook_version == HOOK_INTERFACE_VERSION1) { - query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION1, - istate->fsmonitor_last_update, &query_result); - } - - trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor); - trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s", - core_fsmonitor, query_success ? "success" : "failure"); - } - - /* a fsmonitor process can return '/' to indicate all entries are invalid */ - if (query_success && query_result.buf[bol] != '/') { - /* Mark all entries returned by the monitor as dirty */ - buf = query_result.buf; - for (i = bol; i < query_result.len; i++) { - if (buf[i] != '\0') - continue; - fsmonitor_refresh_callback(istate, buf + bol); - bol = i + 1; - } - if (bol < query_result.len) - fsmonitor_refresh_callback(istate, buf + bol); - - /* Now mark the untracked cache for fsmonitor usage */ - if (istate->untracked) - istate->untracked->use_fsmonitor = 1; - } else { - - /* We only want to run the post index changed hook if we've actually changed entries, so keep track - * if we actually changed entries or not */ - int is_cache_changed = 0; - /* Mark all entries invalid */ - for (i = 0; i < istate->cache_nr; i++) { - if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) { - is_cache_changed = 1; - istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; - } - } - - /* If we're going to check every file, ensure we save the results */ - if (is_cache_changed) - istate->cache_changed |= FSMONITOR_CHANGED; - - if (istate->untracked) - istate->untracked->use_fsmonitor = 0; - } - strbuf_release(&query_result); - - /* Now that we've updated istate, save the last_update_token */ - FREE_AND_NULL(istate->fsmonitor_last_update); - istate->fsmonitor_last_update = strbuf_detach(&last_update_token, NULL); -} - -void add_fsmonitor(struct index_state *istate) -{ - unsigned int i; - struct strbuf last_update = STRBUF_INIT; - - if (!istate->fsmonitor_last_update) { - trace_printf_key(&trace_fsmonitor, "add fsmonitor"); - istate->cache_changed |= FSMONITOR_CHANGED; - strbuf_addf(&last_update, "%"PRIu64"", getnanotime()); - istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL); - - /* reset the fsmonitor state */ - for (i = 0; i < istate->cache_nr; i++) - istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; - - /* reset the untracked cache */ - if (istate->untracked) { - add_untracked_cache(istate); - istate->untracked->use_fsmonitor = 1; - } - - /* Update the fsmonitor state */ - refresh_fsmonitor(istate); - } -} - -void remove_fsmonitor(struct index_state *istate) -{ - if (istate->fsmonitor_last_update) { - trace_printf_key(&trace_fsmonitor, "remove fsmonitor"); - istate->cache_changed |= FSMONITOR_CHANGED; - FREE_AND_NULL(istate->fsmonitor_last_update); - } -} - -void tweak_fsmonitor(struct index_state *istate) -{ - unsigned int i; - int fsmonitor_enabled = git_config_get_fsmonitor(); - - if (istate->fsmonitor_dirty) { - if (fsmonitor_enabled) { - /* Mark all entries valid */ - for (i = 0; i < istate->cache_nr; i++) { - istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID; - } - - /* Mark all previously saved entries as dirty */ - if (istate->fsmonitor_dirty->bit_size > istate->cache_nr) - BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)", - (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr); - ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate); - - refresh_fsmonitor(istate); - } - - ewah_free(istate->fsmonitor_dirty); - istate->fsmonitor_dirty = NULL; - } - - switch (fsmonitor_enabled) { - case -1: /* keep: do nothing */ - break; - case 0: /* false */ - remove_fsmonitor(istate); - break; - case 1: /* true */ - add_fsmonitor(istate); - break; - default: /* unknown value: do nothing */ - break; - } -} |