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![Elijah Newren](/assets/img/avatar_default.png)
Since this header showed up in some places besides just #include statements, update/clean-up/remove those other places as well. Note that compat/fsmonitor/fsm-path-utils-darwin.c previously got away with violating the rule that all files must start with an include of git-compat-util.h (or a short-list of alternate headers that happen to include it first). This change exposed the violation and caused it to stop building correctly; fix it by having it include git-compat-util.h first, as per policy. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
615 lines
18 KiB
C
615 lines
18 KiB
C
#include "git-compat-util.h"
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#include "config.h"
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#include "dir.h"
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#include "environment.h"
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#include "ewah/ewok.h"
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#include "fsmonitor.h"
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#include "fsmonitor-ipc.h"
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#include "run-command.h"
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#include "strbuf.h"
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#include "trace2.h"
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#define INDEX_EXTENSION_VERSION1 (1)
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#define INDEX_EXTENSION_VERSION2 (2)
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#define HOOK_INTERFACE_VERSION1 (1)
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#define HOOK_INTERFACE_VERSION2 (2)
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struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);
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static void assert_index_minimum(struct index_state *istate, size_t pos)
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{
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if (pos > istate->cache_nr)
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BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
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(uintmax_t)pos, istate->cache_nr);
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}
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static void fsmonitor_ewah_callback(size_t pos, void *is)
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{
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struct index_state *istate = (struct index_state *)is;
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struct cache_entry *ce;
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assert_index_minimum(istate, pos + 1);
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ce = istate->cache[pos];
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ce->ce_flags &= ~CE_FSMONITOR_VALID;
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}
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static int fsmonitor_hook_version(void)
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{
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int hook_version;
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if (git_config_get_int("core.fsmonitorhookversion", &hook_version))
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return -1;
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if (hook_version == HOOK_INTERFACE_VERSION1 ||
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hook_version == HOOK_INTERFACE_VERSION2)
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return hook_version;
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warning("Invalid hook version '%i' in core.fsmonitorhookversion. "
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"Must be 1 or 2.", hook_version);
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return -1;
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}
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int read_fsmonitor_extension(struct index_state *istate, const void *data,
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unsigned long sz)
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{
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const char *index = data;
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uint32_t hdr_version;
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uint32_t ewah_size;
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struct ewah_bitmap *fsmonitor_dirty;
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int ret;
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uint64_t timestamp;
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struct strbuf last_update = STRBUF_INIT;
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if (sz < sizeof(uint32_t) + 1 + sizeof(uint32_t))
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return error("corrupt fsmonitor extension (too short)");
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hdr_version = get_be32(index);
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index += sizeof(uint32_t);
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if (hdr_version == INDEX_EXTENSION_VERSION1) {
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timestamp = get_be64(index);
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strbuf_addf(&last_update, "%"PRIu64"", timestamp);
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index += sizeof(uint64_t);
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} else if (hdr_version == INDEX_EXTENSION_VERSION2) {
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strbuf_addstr(&last_update, index);
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index += last_update.len + 1;
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} else {
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return error("bad fsmonitor version %d", hdr_version);
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}
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istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);
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ewah_size = get_be32(index);
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index += sizeof(uint32_t);
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fsmonitor_dirty = ewah_new();
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ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
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if (ret != ewah_size) {
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ewah_free(fsmonitor_dirty);
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return error("failed to parse ewah bitmap reading fsmonitor index extension");
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}
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istate->fsmonitor_dirty = fsmonitor_dirty;
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if (!istate->split_index)
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assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size);
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trace2_data_string("index", NULL, "extension/fsmn/read/token",
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istate->fsmonitor_last_update);
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trace_printf_key(&trace_fsmonitor,
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"read fsmonitor extension successful '%s'",
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istate->fsmonitor_last_update);
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return 0;
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}
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void fill_fsmonitor_bitmap(struct index_state *istate)
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{
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unsigned int i, skipped = 0;
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istate->fsmonitor_dirty = ewah_new();
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for (i = 0; i < istate->cache_nr; i++) {
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if (istate->cache[i]->ce_flags & CE_REMOVE)
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skipped++;
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else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
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ewah_set(istate->fsmonitor_dirty, i - skipped);
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}
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}
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void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
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{
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uint32_t hdr_version;
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uint32_t ewah_start;
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uint32_t ewah_size = 0;
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int fixup = 0;
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if (!istate->split_index)
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assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size);
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put_be32(&hdr_version, INDEX_EXTENSION_VERSION2);
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strbuf_add(sb, &hdr_version, sizeof(uint32_t));
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strbuf_addstr(sb, istate->fsmonitor_last_update);
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strbuf_addch(sb, 0); /* Want to keep a NUL */
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fixup = sb->len;
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strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */
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ewah_start = sb->len;
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ewah_serialize_strbuf(istate->fsmonitor_dirty, sb);
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ewah_free(istate->fsmonitor_dirty);
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istate->fsmonitor_dirty = NULL;
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/* fix up size field */
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put_be32(&ewah_size, sb->len - ewah_start);
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memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));
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trace2_data_string("index", NULL, "extension/fsmn/write/token",
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istate->fsmonitor_last_update);
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trace_printf_key(&trace_fsmonitor,
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"write fsmonitor extension successful '%s'",
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istate->fsmonitor_last_update);
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}
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/*
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* Call the query-fsmonitor hook passing the last update token of the saved results.
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*/
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static int query_fsmonitor_hook(struct repository *r,
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int version,
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const char *last_update,
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struct strbuf *query_result)
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{
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struct child_process cp = CHILD_PROCESS_INIT;
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int result;
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if (fsm_settings__get_mode(r) != FSMONITOR_MODE_HOOK)
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return -1;
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strvec_push(&cp.args, fsm_settings__get_hook_path(r));
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strvec_pushf(&cp.args, "%d", version);
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strvec_pushf(&cp.args, "%s", last_update);
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cp.use_shell = 1;
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cp.dir = get_git_work_tree();
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trace2_region_enter("fsm_hook", "query", NULL);
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result = capture_command(&cp, query_result, 1024);
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if (result)
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trace2_data_intmax("fsm_hook", NULL, "query/failed", result);
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else
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trace2_data_intmax("fsm_hook", NULL, "query/response-length",
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query_result->len);
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trace2_region_leave("fsm_hook", "query", NULL);
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return result;
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}
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static void fsmonitor_refresh_callback(struct index_state *istate, char *name)
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{
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int i, len = strlen(name);
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int pos = index_name_pos(istate, name, len);
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trace_printf_key(&trace_fsmonitor,
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"fsmonitor_refresh_callback '%s' (pos %d)",
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name, pos);
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if (name[len - 1] == '/') {
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/*
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* The daemon can decorate directory events, such as
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* moves or renames, with a trailing slash if the OS
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* FS Event contains sufficient information, such as
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* MacOS.
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*
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* Use this to invalidate the entire cone under that
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* directory.
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*
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* We do not expect an exact match because the index
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* does not normally contain directory entries, so we
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* start at the insertion point and scan.
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*/
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if (pos < 0)
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pos = -pos - 1;
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/* Mark all entries for the folder invalid */
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for (i = pos; i < istate->cache_nr; i++) {
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if (!starts_with(istate->cache[i]->name, name))
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break;
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istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
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}
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/*
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* We need to remove the traling "/" from the path
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* for the untracked cache.
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*/
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name[len - 1] = '\0';
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} else if (pos >= 0) {
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/*
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* We have an exact match for this path and can just
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* invalidate it.
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*/
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istate->cache[pos]->ce_flags &= ~CE_FSMONITOR_VALID;
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} else {
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/*
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* The path is not a tracked file -or- it is a
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* directory event on a platform that cannot
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* distinguish between file and directory events in
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* the event handler, such as Windows.
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*
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* Scan as if it is a directory and invalidate the
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* cone under it. (But remember to ignore items
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* between "name" and "name/", such as "name-" and
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* "name.".
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*/
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pos = -pos - 1;
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for (i = pos; i < istate->cache_nr; i++) {
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if (!starts_with(istate->cache[i]->name, name))
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break;
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if ((unsigned char)istate->cache[i]->name[len] > '/')
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break;
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if (istate->cache[i]->name[len] == '/')
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istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
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}
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}
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/*
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* Mark the untracked cache dirty even if it wasn't found in the index
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* as it could be a new untracked file.
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*/
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untracked_cache_invalidate_path(istate, name, 0);
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}
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/*
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* The number of pathnames that we need to receive from FSMonitor
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* before we force the index to be updated.
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*
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* Note that any pathname within the set of received paths MAY cause
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* cache-entry or istate flag bits to be updated and thus cause the
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* index to be updated on disk.
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*
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* However, the response may contain many paths (such as ignored
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* paths) that will not update any flag bits. And thus not force the
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* index to be updated. (This is fine and normal.) It also means
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* that the token will not be updated in the FSMonitor index
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* extension. So the next Git command will find the same token in the
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* index, make the same token-relative request, and receive the same
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* response (plus any newly changed paths). If this response is large
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* (and continues to grow), performance could be impacted.
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*
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* For example, if the user runs a build and it writes 100K object
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* files but doesn't modify any source files, the index would not need
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* to be updated. The FSMonitor response (after the build and
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* relative to a pre-build token) might be 5MB. Each subsequent Git
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* command will receive that same 100K/5MB response until something
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* causes the index to be updated. And `refresh_fsmonitor()` will
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* have to iterate over those 100K paths each time.
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*
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* Performance could be improved if we optionally force update the
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* index after a very large response and get an updated token into
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* the FSMonitor index extension. This should allow subsequent
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* commands to get smaller and more current responses.
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*
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* The value chosen here does not need to be precise. The index
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* will be updated automatically the first time the user touches
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* a tracked file and causes a command like `git status` to
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* update an mtime to be updated and/or set a flag bit.
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*/
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static int fsmonitor_force_update_threshold = 100;
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void refresh_fsmonitor(struct index_state *istate)
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{
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static int warn_once = 0;
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struct strbuf query_result = STRBUF_INIT;
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int query_success = 0, hook_version = -1;
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size_t bol = 0; /* beginning of line */
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uint64_t last_update;
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struct strbuf last_update_token = STRBUF_INIT;
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char *buf;
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unsigned int i;
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int is_trivial = 0;
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struct repository *r = istate->repo;
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enum fsmonitor_mode fsm_mode = fsm_settings__get_mode(r);
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enum fsmonitor_reason reason = fsm_settings__get_reason(r);
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if (!warn_once && reason > FSMONITOR_REASON_OK) {
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char *msg = fsm_settings__get_incompatible_msg(r, reason);
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warn_once = 1;
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warning("%s", msg);
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free(msg);
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}
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if (fsm_mode <= FSMONITOR_MODE_DISABLED ||
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istate->fsmonitor_has_run_once)
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return;
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istate->fsmonitor_has_run_once = 1;
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trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
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if (fsm_mode == FSMONITOR_MODE_IPC) {
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query_success = !fsmonitor_ipc__send_query(
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istate->fsmonitor_last_update ?
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istate->fsmonitor_last_update : "builtin:fake",
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&query_result);
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if (query_success) {
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/*
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* The response contains a series of nul terminated
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* strings. The first is the new token.
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*
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* Use `char *buf` as an interlude to trick the CI
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* static analysis to let us use `strbuf_addstr()`
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* here (and only copy the token) rather than
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* `strbuf_addbuf()`.
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*/
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buf = query_result.buf;
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strbuf_addstr(&last_update_token, buf);
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bol = last_update_token.len + 1;
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is_trivial = query_result.buf[bol] == '/';
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if (is_trivial)
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trace2_data_intmax("fsm_client", NULL,
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"query/trivial-response", 1);
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} else {
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/*
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* The builtin daemon is not available on this
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* platform -OR- we failed to get a response.
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*
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* Generate a fake token (rather than a V1
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* timestamp) for the index extension. (If
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* they switch back to the hook API, we don't
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* want ambiguous state.)
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*/
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strbuf_addstr(&last_update_token, "builtin:fake");
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}
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goto apply_results;
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}
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assert(fsm_mode == FSMONITOR_MODE_HOOK);
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hook_version = fsmonitor_hook_version();
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/*
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* This could be racy so save the date/time now and query_fsmonitor_hook
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* should be inclusive to ensure we don't miss potential changes.
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*/
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last_update = getnanotime();
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if (hook_version == HOOK_INTERFACE_VERSION1)
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strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
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/*
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* If we have a last update token, call query_fsmonitor_hook for the set of
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* changes since that token, else assume everything is possibly dirty
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* and check it all.
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*/
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if (istate->fsmonitor_last_update) {
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if (hook_version == -1 || hook_version == HOOK_INTERFACE_VERSION2) {
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query_success = !query_fsmonitor_hook(
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r, HOOK_INTERFACE_VERSION2,
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istate->fsmonitor_last_update, &query_result);
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if (query_success) {
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if (hook_version < 0)
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hook_version = HOOK_INTERFACE_VERSION2;
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/*
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* First entry will be the last update token
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* Need to use a char * variable because static
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* analysis was suggesting to use strbuf_addbuf
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* but we don't want to copy the entire strbuf
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* only the chars up to the first NUL
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*/
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buf = query_result.buf;
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strbuf_addstr(&last_update_token, buf);
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if (!last_update_token.len) {
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warning("Empty last update token.");
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query_success = 0;
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} else {
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bol = last_update_token.len + 1;
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is_trivial = query_result.buf[bol] == '/';
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}
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} else if (hook_version < 0) {
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hook_version = HOOK_INTERFACE_VERSION1;
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if (!last_update_token.len)
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strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
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}
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}
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if (hook_version == HOOK_INTERFACE_VERSION1) {
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query_success = !query_fsmonitor_hook(
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r, HOOK_INTERFACE_VERSION1,
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istate->fsmonitor_last_update, &query_result);
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if (query_success)
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is_trivial = query_result.buf[0] == '/';
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}
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if (is_trivial)
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trace2_data_intmax("fsm_hook", NULL,
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"query/trivial-response", 1);
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trace_performance_since(last_update, "fsmonitor process '%s'",
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fsm_settings__get_hook_path(r));
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trace_printf_key(&trace_fsmonitor,
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"fsmonitor process '%s' returned %s",
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fsm_settings__get_hook_path(r),
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query_success ? "success" : "failure");
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}
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apply_results:
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/*
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* The response from FSMonitor (excluding the header token) is
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* either:
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*
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* [a] a (possibly empty) list of NUL delimited relative
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* pathnames of changed paths. This list can contain
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* files and directories. Directories have a trailing
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* slash.
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*
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* [b] a single '/' to indicate the provider had no
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* information and that we should consider everything
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* invalid. We call this a trivial response.
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*/
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trace2_region_enter("fsmonitor", "apply_results", istate->repo);
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if (query_success && !is_trivial) {
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/*
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* Mark all pathnames returned by the monitor as dirty.
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*
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* This updates both the cache-entries and the untracked-cache.
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*/
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int count = 0;
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buf = query_result.buf;
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for (i = bol; i < query_result.len; i++) {
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if (buf[i] != '\0')
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continue;
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fsmonitor_refresh_callback(istate, buf + bol);
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bol = i + 1;
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count++;
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}
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if (bol < query_result.len) {
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fsmonitor_refresh_callback(istate, buf + bol);
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count++;
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}
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/* Now mark the untracked cache for fsmonitor usage */
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if (istate->untracked)
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istate->untracked->use_fsmonitor = 1;
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if (count > fsmonitor_force_update_threshold)
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istate->cache_changed |= FSMONITOR_CHANGED;
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trace2_data_intmax("fsmonitor", istate->repo, "apply_count",
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count);
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} else {
|
|
/*
|
|
* We failed to get a response or received a trivial response,
|
|
* so invalidate everything.
|
|
*
|
|
* 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;
|
|
|
|
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;
|
|
}
|
|
trace2_region_leave("fsmonitor", "apply_results", istate->repo);
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* The caller wants to turn on FSMonitor. And when the caller writes
|
|
* the index to disk, a FSMonitor extension should be included. This
|
|
* requires that `istate->fsmonitor_last_update` not be NULL. But we
|
|
* have not actually talked to a FSMonitor process yet, so we don't
|
|
* have an initial value for this field.
|
|
*
|
|
* For a protocol V1 FSMonitor process, this field is a formatted
|
|
* "nanoseconds since epoch" field. However, for a protocol V2
|
|
* FSMonitor process, this field is an opaque token.
|
|
*
|
|
* Historically, `add_fsmonitor()` has initialized this field to the
|
|
* current time for protocol V1 processes. There are lots of race
|
|
* conditions here, but that code has shipped...
|
|
*
|
|
* The only true solution is to use a V2 FSMonitor and get a current
|
|
* or default token value (that it understands), but we cannot do that
|
|
* until we have actually talked to an instance of the FSMonitor process
|
|
* (but the protocol requires that we send a token first...).
|
|
*
|
|
* For simplicity, just initialize like we have a V1 process and require
|
|
* that V2 processes adapt.
|
|
*/
|
|
static void initialize_fsmonitor_last_update(struct index_state *istate)
|
|
{
|
|
struct strbuf last_update = STRBUF_INIT;
|
|
|
|
strbuf_addf(&last_update, "%"PRIu64"", getnanotime());
|
|
istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);
|
|
}
|
|
|
|
void add_fsmonitor(struct index_state *istate)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!istate->fsmonitor_last_update) {
|
|
trace_printf_key(&trace_fsmonitor, "add fsmonitor");
|
|
istate->cache_changed |= FSMONITOR_CHANGED;
|
|
initialize_fsmonitor_last_update(istate);
|
|
|
|
/* 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 = (fsm_settings__get_mode(istate->repo)
|
|
> FSMONITOR_MODE_DISABLED);
|
|
|
|
if (istate->fsmonitor_dirty) {
|
|
if (fsmonitor_enabled) {
|
|
/* Mark all entries valid */
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
if (S_ISGITLINK(istate->cache[i]->ce_mode))
|
|
continue;
|
|
istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;
|
|
}
|
|
|
|
/* Mark all previously saved entries as dirty */
|
|
assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size);
|
|
ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
|
|
|
|
refresh_fsmonitor(istate);
|
|
}
|
|
|
|
ewah_free(istate->fsmonitor_dirty);
|
|
istate->fsmonitor_dirty = NULL;
|
|
}
|
|
|
|
if (fsmonitor_enabled)
|
|
add_fsmonitor(istate);
|
|
else
|
|
remove_fsmonitor(istate);
|
|
}
|