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/* Copyright 2012-present Facebook, Inc.
* Licensed under the Apache License, Version 2.0 */
#include "watchman.h"
#include "InMemoryView.h"
#include "watchman_error_category.h"
namespace watchman {
void InMemoryView::statPath(
const std::shared_ptr<w_root_t>& root,
SyncView::LockedPtr& view,
PendingCollection::LockedPtr& coll,
const w_string& full_path,
struct timeval now,
int flags,
const watchman_dir_ent* pre_stat) {
watchman::FileInformation st;
std::error_code errcode;
char path[WATCHMAN_NAME_MAX];
bool recursive = flags & W_PENDING_RECURSIVE;
bool via_notify = flags & W_PENDING_VIA_NOTIFY;
if (root->ignore.isIgnoreDir(full_path)) {
w_log(
W_LOG_DBG,
"%.*s matches ignore_dir rules\n",
int(full_path.size()),
full_path.data());
return;
}
if (full_path.size() > sizeof(path) - 1) {
w_log(
W_LOG_FATAL,
"path %.*s is too big\n",
int(full_path.size()),
full_path.data());
}
memcpy(path, full_path.data(), full_path.size());
path[full_path.size()] = 0;
auto dir_name = full_path.dirName();
auto file_name = full_path.baseName();
auto parentDir = resolveDir(view, dir_name, true);
auto file = parentDir->getChildFile(file_name);
auto dir_ent = parentDir->getChildDir(file_name);
if (pre_stat && pre_stat->has_stat) {
st = pre_stat->stat;
} else {
try {
st = getFileInformation(path, root->case_sensitive);
log(DBG, "getFileInformation(", path, ") file=", file, " dir=", dir_ent,
"\n");
} catch (const std::system_error &exc) {
errcode = exc.code();
log(DBG, "getFileInformation(", path, ") file=", file, " dir=", dir_ent,
" failed: ", exc.what(), "\n");
}
}
if (errcode == watchman::error_code::no_such_file_or_directory ||
errcode == watchman::error_code::not_a_directory) {
/* it's not there, update our state */
if (dir_ent) {
markDirDeleted(view, dir_ent, now, true);
watchman::log(
watchman::DBG,
"getFileInformation(",
path,
") -> ",
errcode.message(),
" so stopping watch\n");
}
if (file) {
if (file->exists) {
watchman::log(
watchman::DBG,
"getFileInformation(",
path,
") -> ",
errcode.message(),
" so marking ",
file->getName(),
" deleted\n");
file->exists = false;
markFileChanged(view, file, now);
}
} else {
// It was created and removed before we could ever observe it
// in the filesystem. We need to generate a deleted file
// representation of it now, so that subscription clients can
// be notified of this event
file = getOrCreateChildFile(view, parentDir, file_name, now);
log(DBG, "getFileInformation(", path, ") -> ",
errcode.message(), " and file node was NULL. "
"Generating a deleted node.\n");
file->exists = false;
markFileChanged(view, file, now);
}
if (root->case_sensitive == CaseSensitivity::CaseInSensitive &&
!w_string_equal(dir_name, root->root_path) &&
parentDir->last_check_existed) {
/* If we rejected the name because it wasn't canonical,
* we need to ensure that we look in the parent dir to discover
* the new item(s) */
w_log(
W_LOG_DBG,
"we're case insensitive, and %s is ENOENT, "
"speculatively look at parent dir %.*s\n",
path,
int(dir_name.size()),
dir_name.data());
coll->add(dir_name, now, W_PENDING_CRAWL_ONLY);
}
} else if (errcode.value()) {
log(ERR,
"getFileInformation(",
path,
") failed and not handled! -> ",
errcode.message(),
" value=",
errcode.value(),
" category=",
errcode.category().name(),
"\n");
} else {
if (!file) {
file = getOrCreateChildFile(view, parentDir, file_name, now);
}
if (!file->exists) {
/* we're transitioning from deleted to existing,
* so we're effectively new again */
file->ctime.ticks = view->mostRecentTick;
file->ctime.timestamp = now.tv_sec;
/* if a dir was deleted and now exists again, we want
* to crawl it again */
recursive = true;
}
if (!file->exists || via_notify || did_file_change(&file->stat, &st)) {
w_log(
W_LOG_DBG,
"file changed exists=%d via_notify=%d stat-changed=%d isdir=%d %s\n",
(int)file->exists,
(int)via_notify,
(int)(file->exists && !via_notify),
st.isDir(),
path);
file->exists = true;
markFileChanged(view, file, now);
}
memcpy(&file->stat, &st, sizeof(file->stat));
// check for symbolic link
if (st.isSymlink()) {
try {
auto target = readSymbolicLink(path);
bool symlink_changed = false;
if (file->symlink_target != target) {
symlink_changed = true;
}
file->symlink_target = target;
if (symlink_changed && root->config.getBool("watch_symlinks", false)) {
root->inner.pending_symlink_targets.wlock()->add(full_path, now, 0);
}
} catch (const std::system_error& exc) {
log(ERR, "readlink(", path, ") failed: ", exc.what(), "\n");
file->symlink_target.reset();
}
} else {
file->symlink_target.reset();
}
if (st.isDir()) {
if (dir_ent == NULL) {
recursive = true;
} else {
// Ensure that we believe that this node exists
dir_ent->last_check_existed = true;
}
// Don't recurse if our parent is an ignore dir
if (!root->ignore.isIgnoreVCS(dir_name) ||
// but do if we're looking at the cookie dir (stat_path is never
// called for the root itself)
w_string_equal(full_path, root->cookies.cookieDir())) {
if (!(watcher_->flags & WATCHER_HAS_PER_FILE_NOTIFICATIONS)) {
/* we always need to crawl, but may not need to be fully recursive */
coll->add(
full_path,
now,
W_PENDING_CRAWL_ONLY | (recursive ? W_PENDING_RECURSIVE : 0));
} else {
/* we get told about changes on the child, so we only
* need to crawl if we've never seen the dir before.
* An exception is that fsevents will only report the root
* of a dir rename and not a rename event for all of its
* children. */
if (recursive) {
coll->add(
full_path, now, W_PENDING_RECURSIVE | W_PENDING_CRAWL_ONLY);
}
}
}
} else if (dir_ent) {
// We transitioned from dir to file (see fishy.php), so we should prune
// our former tree here
markDirDeleted(view, dir_ent, now, true);
}
if ((watcher_->flags & WATCHER_HAS_PER_FILE_NOTIFICATIONS) && !st.isDir() &&
!w_string_equal(dir_name, root->root_path) &&
parentDir->last_check_existed) {
/* Make sure we update the mtime on the parent directory.
* We're deliberately not propagating any of the flags through; we
* definitely don't want this to be a recursive evaluation and we
* won'd want to treat this as VIA_NOTIFY to avoid spuriously
* marking the node as changed when only its atime was changed.
* https://github.com/facebook/watchman/issues/305 and
* https://github.com/facebook/watchman/issues/307 have more
* context on why this is.
*/
coll->add(dir_name, now, 0);
}
}
}
}
/* vim:ts=2:sw=2:et:
*/
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