mirror of
https://github.com/git/git
synced 2024-08-28 12:09:19 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
We learned to talk to watchman to speed up "git status" and other operations that need to see which paths have been modified. * bp/fsmonitor: fsmonitor: preserve utf8 filenames in fsmonitor-watchman log fsmonitor: read entirety of watchman output fsmonitor: MINGW support for watchman integration fsmonitor: add a performance test fsmonitor: add a sample integration script for Watchman fsmonitor: add test cases for fsmonitor extension split-index: disable the fsmonitor extension when running the split index test fsmonitor: add a test tool to dump the index extension update-index: add fsmonitor support to update-index ls-files: Add support in ls-files to display the fsmonitor valid bit fsmonitor: add documentation for the fsmonitor extension. fsmonitor: teach git to optionally utilize a file system monitor to speed up detecting new or changed files. update-index: add a new --force-write-index option preload-index: add override to enable testing preload-index bswap: add 64 bit endianness helper get_be64
478 lines
12 KiB
C
478 lines
12 KiB
C
#include "cache.h"
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#include "blob.h"
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#include "dir.h"
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#include "streaming.h"
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#include "submodule.h"
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#include "progress.h"
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#include "fsmonitor.h"
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static void create_directories(const char *path, int path_len,
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const struct checkout *state)
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{
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char *buf = xmallocz(path_len);
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int len = 0;
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while (len < path_len) {
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do {
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buf[len] = path[len];
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len++;
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} while (len < path_len && path[len] != '/');
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if (len >= path_len)
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break;
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buf[len] = 0;
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/*
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* For 'checkout-index --prefix=<dir>', <dir> is
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* allowed to be a symlink to an existing directory,
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* and we set 'state->base_dir_len' below, such that
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* we test the path components of the prefix with the
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* stat() function instead of the lstat() function.
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*/
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if (has_dirs_only_path(buf, len, state->base_dir_len))
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continue; /* ok, it is already a directory. */
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/*
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* If this mkdir() would fail, it could be that there
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* is already a symlink or something else exists
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* there, therefore we then try to unlink it and try
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* one more time to create the directory.
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*/
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if (mkdir(buf, 0777)) {
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if (errno == EEXIST && state->force &&
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!unlink_or_warn(buf) && !mkdir(buf, 0777))
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continue;
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die_errno("cannot create directory at '%s'", buf);
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}
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}
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free(buf);
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}
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static void remove_subtree(struct strbuf *path)
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{
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DIR *dir = opendir(path->buf);
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struct dirent *de;
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int origlen = path->len;
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if (!dir)
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die_errno("cannot opendir '%s'", path->buf);
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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if (is_dot_or_dotdot(de->d_name))
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continue;
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strbuf_addch(path, '/');
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strbuf_addstr(path, de->d_name);
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if (lstat(path->buf, &st))
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die_errno("cannot lstat '%s'", path->buf);
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if (S_ISDIR(st.st_mode))
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remove_subtree(path);
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else if (unlink(path->buf))
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die_errno("cannot unlink '%s'", path->buf);
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strbuf_setlen(path, origlen);
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}
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closedir(dir);
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if (rmdir(path->buf))
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die_errno("cannot rmdir '%s'", path->buf);
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}
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static int create_file(const char *path, unsigned int mode)
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{
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mode = (mode & 0100) ? 0777 : 0666;
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return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
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}
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static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
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{
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enum object_type type;
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void *new = read_sha1_file(ce->oid.hash, &type, size);
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if (new) {
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if (type == OBJ_BLOB)
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return new;
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free(new);
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}
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return NULL;
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}
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static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
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{
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int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
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if (to_tempfile) {
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xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s",
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symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
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return mkstemp(path);
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} else {
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return create_file(path, !symlink ? ce->ce_mode : 0666);
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}
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}
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static int fstat_output(int fd, const struct checkout *state, struct stat *st)
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{
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/* use fstat() only when path == ce->name */
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if (fstat_is_reliable() &&
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state->refresh_cache && !state->base_dir_len) {
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fstat(fd, st);
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return 1;
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}
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return 0;
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}
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static int streaming_write_entry(const struct cache_entry *ce, char *path,
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struct stream_filter *filter,
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const struct checkout *state, int to_tempfile,
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int *fstat_done, struct stat *statbuf)
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{
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int result = 0;
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int fd;
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fd = open_output_fd(path, ce, to_tempfile);
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if (fd < 0)
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return -1;
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result |= stream_blob_to_fd(fd, &ce->oid, filter, 1);
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*fstat_done = fstat_output(fd, state, statbuf);
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result |= close(fd);
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if (result)
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unlink(path);
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return result;
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}
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void enable_delayed_checkout(struct checkout *state)
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{
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if (!state->delayed_checkout) {
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state->delayed_checkout = xmalloc(sizeof(*state->delayed_checkout));
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state->delayed_checkout->state = CE_CAN_DELAY;
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string_list_init(&state->delayed_checkout->filters, 0);
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string_list_init(&state->delayed_checkout->paths, 0);
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}
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}
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static int remove_available_paths(struct string_list_item *item, void *cb_data)
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{
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struct string_list *available_paths = cb_data;
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struct string_list_item *available;
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available = string_list_lookup(available_paths, item->string);
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if (available)
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available->util = (void *)item->string;
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return !available;
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}
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int finish_delayed_checkout(struct checkout *state)
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{
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int errs = 0;
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unsigned delayed_object_count;
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off_t filtered_bytes = 0;
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struct string_list_item *filter, *path;
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struct progress *progress;
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struct delayed_checkout *dco = state->delayed_checkout;
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if (!state->delayed_checkout)
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return errs;
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dco->state = CE_RETRY;
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delayed_object_count = dco->paths.nr;
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progress = start_delayed_progress(_("Filtering content"), delayed_object_count);
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while (dco->filters.nr > 0) {
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for_each_string_list_item(filter, &dco->filters) {
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struct string_list available_paths = STRING_LIST_INIT_NODUP;
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display_progress(progress, delayed_object_count - dco->paths.nr);
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if (!async_query_available_blobs(filter->string, &available_paths)) {
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/* Filter reported an error */
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errs = 1;
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filter->string = "";
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continue;
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}
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if (available_paths.nr <= 0) {
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/*
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* Filter responded with no entries. That means
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* the filter is done and we can remove the
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* filter from the list (see
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* "string_list_remove_empty_items" call below).
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*/
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filter->string = "";
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continue;
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}
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/*
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* In dco->paths we store a list of all delayed paths.
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* The filter just send us a list of available paths.
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* Remove them from the list.
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*/
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filter_string_list(&dco->paths, 0,
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&remove_available_paths, &available_paths);
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for_each_string_list_item(path, &available_paths) {
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struct cache_entry* ce;
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if (!path->util) {
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error("external filter '%s' signaled that '%s' "
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"is now available although it has not been "
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"delayed earlier",
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filter->string, path->string);
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errs |= 1;
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/*
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* Do not ask the filter for available blobs,
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* again, as the filter is likely buggy.
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*/
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filter->string = "";
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continue;
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}
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ce = index_file_exists(state->istate, path->string,
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strlen(path->string), 0);
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if (ce) {
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errs |= checkout_entry(ce, state, NULL);
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filtered_bytes += ce->ce_stat_data.sd_size;
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display_throughput(progress, filtered_bytes);
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} else
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errs = 1;
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}
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}
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string_list_remove_empty_items(&dco->filters, 0);
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}
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stop_progress(&progress);
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string_list_clear(&dco->filters, 0);
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/* At this point we should not have any delayed paths anymore. */
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errs |= dco->paths.nr;
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for_each_string_list_item(path, &dco->paths) {
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error("'%s' was not filtered properly", path->string);
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}
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string_list_clear(&dco->paths, 0);
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free(dco);
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state->delayed_checkout = NULL;
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return errs;
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}
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static int write_entry(struct cache_entry *ce,
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char *path, const struct checkout *state, int to_tempfile)
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{
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unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
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struct delayed_checkout *dco = state->delayed_checkout;
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int fd, ret, fstat_done = 0;
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char *new;
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struct strbuf buf = STRBUF_INIT;
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unsigned long size;
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ssize_t wrote;
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size_t newsize = 0;
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struct stat st;
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const struct submodule *sub;
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if (ce_mode_s_ifmt == S_IFREG) {
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struct stream_filter *filter = get_stream_filter(ce->name,
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ce->oid.hash);
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if (filter &&
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!streaming_write_entry(ce, path, filter,
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state, to_tempfile,
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&fstat_done, &st))
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goto finish;
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}
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switch (ce_mode_s_ifmt) {
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case S_IFLNK:
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new = read_blob_entry(ce, &size);
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if (!new)
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return error("unable to read sha1 file of %s (%s)",
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path, oid_to_hex(&ce->oid));
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/*
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* We can't make a real symlink; write out a regular file entry
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* with the symlink destination as its contents.
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*/
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if (!has_symlinks || to_tempfile)
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goto write_file_entry;
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ret = symlink(new, path);
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free(new);
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if (ret)
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return error_errno("unable to create symlink %s", path);
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break;
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case S_IFREG:
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/*
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* We do not send the blob in case of a retry, so do not
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* bother reading it at all.
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*/
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if (dco && dco->state == CE_RETRY) {
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new = NULL;
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size = 0;
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} else {
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new = read_blob_entry(ce, &size);
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if (!new)
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return error("unable to read sha1 file of %s (%s)",
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path, oid_to_hex(&ce->oid));
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}
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/*
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* Convert from git internal format to working tree format
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*/
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if (dco && dco->state != CE_NO_DELAY) {
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ret = async_convert_to_working_tree(ce->name, new,
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size, &buf, dco);
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if (ret && string_list_has_string(&dco->paths, ce->name)) {
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free(new);
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goto delayed;
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}
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} else
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ret = convert_to_working_tree(ce->name, new, size, &buf);
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if (ret) {
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free(new);
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new = strbuf_detach(&buf, &newsize);
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size = newsize;
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}
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/*
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* No "else" here as errors from convert are OK at this
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* point. If the error would have been fatal (e.g.
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* filter is required), then we would have died already.
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*/
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write_file_entry:
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fd = open_output_fd(path, ce, to_tempfile);
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if (fd < 0) {
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free(new);
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return error_errno("unable to create file %s", path);
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}
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wrote = write_in_full(fd, new, size);
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if (!to_tempfile)
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fstat_done = fstat_output(fd, state, &st);
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close(fd);
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free(new);
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if (wrote < 0)
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return error("unable to write file %s", path);
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break;
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case S_IFGITLINK:
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if (to_tempfile)
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return error("cannot create temporary submodule %s", path);
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if (mkdir(path, 0777) < 0)
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return error("cannot create submodule directory %s", path);
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sub = submodule_from_ce(ce);
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if (sub)
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return submodule_move_head(ce->name,
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NULL, oid_to_hex(&ce->oid),
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state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
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break;
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default:
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return error("unknown file mode for %s in index", path);
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}
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finish:
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if (state->refresh_cache) {
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assert(state->istate);
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if (!fstat_done)
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if (lstat(ce->name, &st) < 0)
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return error_errno("unable to stat just-written file %s",
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ce->name);
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fill_stat_cache_info(ce, &st);
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ce->ce_flags |= CE_UPDATE_IN_BASE;
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mark_fsmonitor_invalid(state->istate, ce);
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state->istate->cache_changed |= CE_ENTRY_CHANGED;
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}
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delayed:
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return 0;
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}
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/*
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* This is like 'lstat()', except it refuses to follow symlinks
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* in the path, after skipping "skiplen".
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*/
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static int check_path(const char *path, int len, struct stat *st, int skiplen)
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{
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const char *slash = path + len;
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while (path < slash && *slash != '/')
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slash--;
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if (!has_dirs_only_path(path, slash - path, skiplen)) {
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errno = ENOENT;
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return -1;
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}
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return lstat(path, st);
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}
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/*
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* Write the contents from ce out to the working tree.
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*
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* When topath[] is not NULL, instead of writing to the working tree
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* file named by ce, a temporary file is created by this function and
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* its name is returned in topath[], which must be able to hold at
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* least TEMPORARY_FILENAME_LENGTH bytes long.
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*/
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int checkout_entry(struct cache_entry *ce,
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const struct checkout *state, char *topath)
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{
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static struct strbuf path = STRBUF_INIT;
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struct stat st;
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if (topath)
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return write_entry(ce, topath, state, 1);
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strbuf_reset(&path);
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strbuf_add(&path, state->base_dir, state->base_dir_len);
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strbuf_add(&path, ce->name, ce_namelen(ce));
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if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
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const struct submodule *sub;
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unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
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/*
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* Needs to be checked before !changed returns early,
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* as the possibly empty directory was not changed
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*/
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sub = submodule_from_ce(ce);
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if (sub) {
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int err;
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if (!is_submodule_populated_gently(ce->name, &err)) {
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struct stat sb;
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if (lstat(ce->name, &sb))
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die(_("could not stat file '%s'"), ce->name);
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if (!(st.st_mode & S_IFDIR))
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unlink_or_warn(ce->name);
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return submodule_move_head(ce->name,
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NULL, oid_to_hex(&ce->oid), 0);
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} else
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return submodule_move_head(ce->name,
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"HEAD", oid_to_hex(&ce->oid),
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state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
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}
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if (!changed)
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return 0;
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if (!state->force) {
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if (!state->quiet)
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fprintf(stderr,
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"%s already exists, no checkout\n",
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path.buf);
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return -1;
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}
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/*
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* We unlink the old file, to get the new one with the
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* right permissions (including umask, which is nasty
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* to emulate by hand - much easier to let the system
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* just do the right thing)
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*/
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if (S_ISDIR(st.st_mode)) {
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/* If it is a gitlink, leave it alone! */
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if (S_ISGITLINK(ce->ce_mode))
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return 0;
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if (!state->force)
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return error("%s is a directory", path.buf);
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remove_subtree(&path);
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} else if (unlink(path.buf))
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return error_errno("unable to unlink old '%s'", path.buf);
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} else if (state->not_new)
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return 0;
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create_directories(path.buf, path.len, state);
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return write_entry(ce, path.buf, state, 0);
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}
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