git/fsmonitor.c
Jeff Hostetler 29c139ce78 fsmonitor: support case-insensitive events
Teach fsmonitor_refresh_callback() to handle case-insensitive
lookups if case-sensitive lookups fail on case-insensitive systems.
This can cause 'git status' to report stale status for files if there
are case issues/errors in the worktree.

The FSMonitor daemon sends FSEvents using the observed spelling
of each pathname.  On case-insensitive file systems this may be
different than the expected case spelling.

The existing code uses index_name_pos() to find the cache-entry for
the pathname in the FSEvent and clear the CE_FSMONITOR_VALID bit so
that the worktree scan/index refresh will revisit and revalidate the
path.

On a case-insensitive file system, the exact match lookup may fail
to find the associated cache-entry. This causes status to think that
the cached CE flags are correct and skip over the file.

Update event handling to optionally use the name-hash and dir-name-hash
if necessary.

Also update t7527 to convert the "test_expect_failure" to "_success"
now that we have fixed the bug.

Signed-off-by: Jeff Hostetler <jeffhostetler@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2024-03-06 09:10:06 -08:00

819 lines
26 KiB
C

#include "git-compat-util.h"
#include "config.h"
#include "dir.h"
#include "environment.h"
#include "ewah/ewok.h"
#include "fsmonitor.h"
#include "fsmonitor-ipc.h"
#include "name-hash.h"
#include "run-command.h"
#include "strbuf.h"
#include "trace2.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 assert_index_minimum(struct index_state *istate, size_t pos)
{
if (pos > istate->cache_nr)
BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
(uintmax_t)pos, istate->cache_nr);
}
static void fsmonitor_ewah_callback(size_t pos, void *is)
{
struct index_state *istate = (struct index_state *)is;
struct cache_entry *ce;
assert_index_minimum(istate, pos + 1);
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)
assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size);
trace2_data_string("index", NULL, "extension/fsmn/read/token",
istate->fsmonitor_last_update);
trace_printf_key(&trace_fsmonitor,
"read fsmonitor extension successful '%s'",
istate->fsmonitor_last_update);
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)
assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size);
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));
trace2_data_string("index", NULL, "extension/fsmn/write/token",
istate->fsmonitor_last_update);
trace_printf_key(&trace_fsmonitor,
"write fsmonitor extension successful '%s'",
istate->fsmonitor_last_update);
}
/*
* Call the query-fsmonitor hook passing the last update token of the saved results.
*/
static int query_fsmonitor_hook(struct repository *r,
int version,
const char *last_update,
struct strbuf *query_result)
{
struct child_process cp = CHILD_PROCESS_INIT;
int result;
if (fsm_settings__get_mode(r) != FSMONITOR_MODE_HOOK)
return -1;
strvec_push(&cp.args, fsm_settings__get_hook_path(r));
strvec_pushf(&cp.args, "%d", version);
strvec_pushf(&cp.args, "%s", last_update);
cp.use_shell = 1;
cp.dir = get_git_work_tree();
trace2_region_enter("fsm_hook", "query", NULL);
result = capture_command(&cp, query_result, 1024);
if (result)
trace2_data_intmax("fsm_hook", NULL, "query/failed", result);
else
trace2_data_intmax("fsm_hook", NULL, "query/response-length",
query_result->len);
trace2_region_leave("fsm_hook", "query", NULL);
return result;
}
/*
* Invalidate the FSM bit on this CE. This is like mark_fsmonitor_invalid()
* but we've already handled the untracked-cache, so let's not repeat that
* work. This also lets us have a different trace message so that we can
* see everything that was done as part of the refresh-callback.
*/
static void invalidate_ce_fsm(struct cache_entry *ce)
{
if (ce->ce_flags & CE_FSMONITOR_VALID) {
trace_printf_key(&trace_fsmonitor,
"fsmonitor_refresh_callback INV: '%s'",
ce->name);
ce->ce_flags &= ~CE_FSMONITOR_VALID;
}
}
static size_t handle_path_with_trailing_slash(
struct index_state *istate, const char *name, int pos);
/*
* Use the name-hash to do a case-insensitive cache-entry lookup with
* the pathname and invalidate the cache-entry.
*
* Returns the number of cache-entries that we invalidated.
*/
static size_t handle_using_name_hash_icase(
struct index_state *istate, const char *name)
{
struct cache_entry *ce = NULL;
ce = index_file_exists(istate, name, strlen(name), 1);
if (!ce)
return 0;
/*
* A case-insensitive search in the name-hash using the
* observed pathname found a cache-entry, so the observed path
* is case-incorrect. Invalidate the cache-entry and use the
* correct spelling from the cache-entry to invalidate the
* untracked-cache. Since we now have sparse-directories in
* the index, the observed pathname may represent a regular
* file or a sparse-index directory.
*
* Note that we should not have seen FSEvents for a
* sparse-index directory, but we handle it just in case.
*
* Either way, we know that there are not any cache-entries for
* children inside the cone of the directory, so we don't need to
* do the usual scan.
*/
trace_printf_key(&trace_fsmonitor,
"fsmonitor_refresh_callback MAP: '%s' '%s'",
name, ce->name);
/*
* NEEDSWORK: We used the name-hash to find the correct
* case-spelling of the pathname in the cache-entry[], so
* technically this is a tracked file or a sparse-directory.
* It should not have any entries in the untracked-cache, so
* we should not need to use the case-corrected spelling to
* invalidate the the untracked-cache. So we may not need to
* do this. For now, I'm going to be conservative and always
* do it; we can revisit this later.
*/
untracked_cache_invalidate_trimmed_path(istate, ce->name, 0);
invalidate_ce_fsm(ce);
return 1;
}
/*
* Use the dir-name-hash to find the correct-case spelling of the
* directory. Use the canonical spelling to invalidate all of the
* cache-entries within the matching cone.
*
* Returns the number of cache-entries that we invalidated.
*/
static size_t handle_using_dir_name_hash_icase(
struct index_state *istate, const char *name)
{
struct strbuf canonical_path = STRBUF_INIT;
int pos;
size_t len = strlen(name);
size_t nr_in_cone;
if (name[len - 1] == '/')
len--;
if (!index_dir_find(istate, name, len, &canonical_path))
return 0; /* name is untracked */
if (!memcmp(name, canonical_path.buf, canonical_path.len)) {
strbuf_release(&canonical_path);
/*
* NEEDSWORK: Our caller already tried an exact match
* and failed to find one. They called us to do an
* ICASE match, so we should never get an exact match,
* so we could promote this to a BUG() here if we
* wanted to. It doesn't hurt anything to just return
* 0 and go on because we should never get here. Or we
* could just get rid of the memcmp() and this "if"
* clause completely.
*/
BUG("handle_using_dir_name_hash_icase(%s) did not exact match",
name);
}
trace_printf_key(&trace_fsmonitor,
"fsmonitor_refresh_callback MAP: '%s' '%s'",
name, canonical_path.buf);
/*
* The dir-name-hash only tells us the corrected spelling of
* the prefix. We have to use this canonical path to do a
* lookup in the cache-entry array so that we repeat the
* original search using the case-corrected spelling.
*/
strbuf_addch(&canonical_path, '/');
pos = index_name_pos(istate, canonical_path.buf,
canonical_path.len);
nr_in_cone = handle_path_with_trailing_slash(
istate, canonical_path.buf, pos);
strbuf_release(&canonical_path);
return nr_in_cone;
}
/*
* The daemon sent an observed pathname without a trailing slash.
* (This is the normal case.) We do not know if it is a tracked or
* untracked file, a sparse-directory, or a populated directory (on a
* platform such as Windows where FSEvents are not qualified).
*
* The pathname contains the observed case reported by the FS. We
* do not know it is case-correct or -incorrect.
*
* Assume it is case-correct and try an exact match.
*
* Return the number of cache-entries that we invalidated.
*/
static size_t handle_path_without_trailing_slash(
struct index_state *istate, const char *name, int pos)
{
/*
* Mark the untracked cache dirty for this path (regardless of
* whether or not we find an exact match for it in the index).
* Since the path is unqualified (no trailing slash hint in the
* FSEvent), it may refer to a file or directory. So we should
* not assume one or the other and should always let the untracked
* cache decide what needs to invalidated.
*/
untracked_cache_invalidate_trimmed_path(istate, name, 0);
if (pos >= 0) {
/*
* An exact match on a tracked file. We assume that we
* do not need to scan forward for a sparse-directory
* cache-entry with the same pathname, nor for a cone
* at that directory. (That is, assume no D/F conflicts.)
*/
invalidate_ce_fsm(istate->cache[pos]);
return 1;
} else {
size_t nr_in_cone;
struct strbuf work_path = STRBUF_INIT;
/*
* The negative "pos" gives us the suggested insertion
* point for the pathname (without the trailing slash).
* We need to see if there is a directory with that
* prefix, but there can be lots of pathnames between
* "foo" and "foo/" like "foo-" or "foo-bar", so we
* don't want to do our own scan.
*/
strbuf_add(&work_path, name, strlen(name));
strbuf_addch(&work_path, '/');
pos = index_name_pos(istate, work_path.buf, work_path.len);
nr_in_cone = handle_path_with_trailing_slash(
istate, work_path.buf, pos);
strbuf_release(&work_path);
return nr_in_cone;
}
}
/*
* The daemon can decorate directory events, such as a move or rename,
* by adding a trailing slash to the observed name. Use this to
* explicitly invalidate the entire cone under that directory.
*
* The daemon can only reliably do that if the OS FSEvent contains
* sufficient information in the event.
*
* macOS FSEvents have enough information.
*
* Other platforms may or may not be able to do it (and it might
* depend on the type of event (for example, a daemon could lstat() an
* observed pathname after a rename, but not after a delete)).
*
* If we find an exact match in the index for a path with a trailing
* slash, it means that we matched a sparse-index directory in a
* cone-mode sparse-checkout (since that's the only time we have
* directories in the index). We should never see this in practice
* (because sparse directories should not be present and therefore
* not generating FS events). Either way, we can treat them in the
* same way and just invalidate the cache-entry and the untracked
* cache (and in this case, the forward cache-entry scan won't find
* anything and it doesn't hurt to let it run).
*
* Return the number of cache-entries that we invalidated. We will
* use this later to determine if we need to attempt a second
* case-insensitive search on case-insensitive file systems. That is,
* if the search using the observed-case in the FSEvent yields any
* results, we assume the prefix is case-correct. If there are no
* matches, we still don't know if the observed path is simply
* untracked or case-incorrect.
*/
static size_t handle_path_with_trailing_slash(
struct index_state *istate, const char *name, int pos)
{
int i;
size_t nr_in_cone = 0;
/*
* Mark the untracked cache dirty for this directory path
* (regardless of whether or not we find an exact match for it
* in the index or find it to be proper prefix of one or more
* files in the index), since the FSEvent is hinting that
* there may be changes on or within the directory.
*/
untracked_cache_invalidate_trimmed_path(istate, name, 0);
if (pos < 0)
pos = -pos - 1;
/* Mark all entries for the folder invalid */
for (i = pos; i < istate->cache_nr; i++) {
if (!starts_with(istate->cache[i]->name, name))
break;
invalidate_ce_fsm(istate->cache[i]);
nr_in_cone++;
}
return nr_in_cone;
}
static void fsmonitor_refresh_callback(struct index_state *istate, char *name)
{
int len = strlen(name);
int pos = index_name_pos(istate, name, len);
size_t nr_in_cone;
trace_printf_key(&trace_fsmonitor,
"fsmonitor_refresh_callback '%s' (pos %d)",
name, pos);
if (name[len - 1] == '/')
nr_in_cone = handle_path_with_trailing_slash(istate, name, pos);
else
nr_in_cone = handle_path_without_trailing_slash(istate, name, pos);
/*
* If we did not find an exact match for this pathname or any
* cache-entries with this directory prefix and we're on a
* case-insensitive file system, try again using the name-hash
* and dir-name-hash.
*/
if (!nr_in_cone && ignore_case) {
nr_in_cone = handle_using_name_hash_icase(istate, name);
if (!nr_in_cone)
nr_in_cone = handle_using_dir_name_hash_icase(
istate, name);
}
if (nr_in_cone)
trace_printf_key(&trace_fsmonitor,
"fsmonitor_refresh_callback CNT: %d",
(int)nr_in_cone);
}
/*
* The number of pathnames that we need to receive from FSMonitor
* before we force the index to be updated.
*
* Note that any pathname within the set of received paths MAY cause
* cache-entry or istate flag bits to be updated and thus cause the
* index to be updated on disk.
*
* However, the response may contain many paths (such as ignored
* paths) that will not update any flag bits. And thus not force the
* index to be updated. (This is fine and normal.) It also means
* that the token will not be updated in the FSMonitor index
* extension. So the next Git command will find the same token in the
* index, make the same token-relative request, and receive the same
* response (plus any newly changed paths). If this response is large
* (and continues to grow), performance could be impacted.
*
* For example, if the user runs a build and it writes 100K object
* files but doesn't modify any source files, the index would not need
* to be updated. The FSMonitor response (after the build and
* relative to a pre-build token) might be 5MB. Each subsequent Git
* command will receive that same 100K/5MB response until something
* causes the index to be updated. And `refresh_fsmonitor()` will
* have to iterate over those 100K paths each time.
*
* Performance could be improved if we optionally force update the
* index after a very large response and get an updated token into
* the FSMonitor index extension. This should allow subsequent
* commands to get smaller and more current responses.
*
* The value chosen here does not need to be precise. The index
* will be updated automatically the first time the user touches
* a tracked file and causes a command like `git status` to
* update an mtime to be updated and/or set a flag bit.
*/
static int fsmonitor_force_update_threshold = 100;
void refresh_fsmonitor(struct index_state *istate)
{
static int warn_once = 0;
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;
int is_trivial = 0;
struct repository *r = istate->repo;
enum fsmonitor_mode fsm_mode = fsm_settings__get_mode(r);
enum fsmonitor_reason reason = fsm_settings__get_reason(r);
if (!warn_once && reason > FSMONITOR_REASON_OK) {
char *msg = fsm_settings__get_incompatible_msg(r, reason);
warn_once = 1;
warning("%s", msg);
free(msg);
}
if (fsm_mode <= FSMONITOR_MODE_DISABLED ||
istate->fsmonitor_has_run_once)
return;
istate->fsmonitor_has_run_once = 1;
trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
if (fsm_mode == FSMONITOR_MODE_IPC) {
query_success = !fsmonitor_ipc__send_query(
istate->fsmonitor_last_update ?
istate->fsmonitor_last_update : "builtin:fake",
&query_result);
if (query_success) {
/*
* The response contains a series of nul terminated
* strings. The first is the new token.
*
* Use `char *buf` as an interlude to trick the CI
* static analysis to let us use `strbuf_addstr()`
* here (and only copy the token) rather than
* `strbuf_addbuf()`.
*/
buf = query_result.buf;
strbuf_addstr(&last_update_token, buf);
bol = last_update_token.len + 1;
is_trivial = query_result.buf[bol] == '/';
if (is_trivial)
trace2_data_intmax("fsm_client", NULL,
"query/trivial-response", 1);
} else {
/*
* The builtin daemon is not available on this
* platform -OR- we failed to get a response.
*
* Generate a fake token (rather than a V1
* timestamp) for the index extension. (If
* they switch back to the hook API, we don't
* want ambiguous state.)
*/
strbuf_addstr(&last_update_token, "builtin:fake");
}
goto apply_results;
}
assert(fsm_mode == FSMONITOR_MODE_HOOK);
hook_version = fsmonitor_hook_version();
/*
* This could be racy so save the date/time now and query_fsmonitor_hook
* 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_hook 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(
r, 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;
is_trivial = query_result.buf[bol] == '/';
}
} 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(
r, HOOK_INTERFACE_VERSION1,
istate->fsmonitor_last_update, &query_result);
if (query_success)
is_trivial = query_result.buf[0] == '/';
}
if (is_trivial)
trace2_data_intmax("fsm_hook", NULL,
"query/trivial-response", 1);
trace_performance_since(last_update, "fsmonitor process '%s'",
fsm_settings__get_hook_path(r));
trace_printf_key(&trace_fsmonitor,
"fsmonitor process '%s' returned %s",
fsm_settings__get_hook_path(r),
query_success ? "success" : "failure");
}
apply_results:
/*
* The response from FSMonitor (excluding the header token) is
* either:
*
* [a] a (possibly empty) list of NUL delimited relative
* pathnames of changed paths. This list can contain
* files and directories. Directories have a trailing
* slash.
*
* [b] a single '/' to indicate the provider had no
* information and that we should consider everything
* invalid. We call this a trivial response.
*/
trace2_region_enter("fsmonitor", "apply_results", istate->repo);
if (query_success && !is_trivial) {
/*
* Mark all pathnames returned by the monitor as dirty.
*
* This updates both the cache-entries and the untracked-cache.
*/
int count = 0;
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;
count++;
}
if (bol < query_result.len) {
fsmonitor_refresh_callback(istate, buf + bol);
count++;
}
/* Now mark the untracked cache for fsmonitor usage */
if (istate->untracked)
istate->untracked->use_fsmonitor = 1;
if (count > fsmonitor_force_update_threshold)
istate->cache_changed |= FSMONITOR_CHANGED;
trace2_data_intmax("fsmonitor", istate->repo, "apply_count",
count);
} 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);
}