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![Junio C Hamano](/assets/img/avatar_default.png)
Somehow we did not allow stuffing the index with stage 0 entries through --index-info interface. I do not think of a reason to forbid it offhand. Signed-off-by: Junio C Hamano <junkio@cox.net>
558 lines
13 KiB
C
558 lines
13 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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#include "strbuf.h"
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#include "quote.h"
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/*
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* Default to not allowing changes to the list of files. The
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* tool doesn't actually care, but this makes it harder to add
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* files to the revision control by mistake by doing something
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* like "git-update-index *" and suddenly having all the object
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* files be revision controlled.
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*/
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static int allow_add;
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static int allow_remove;
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static int allow_replace;
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static int allow_unmerged; /* --refresh needing merge is not error */
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static int not_new; /* --refresh not having working tree files is not error */
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static int quiet; /* --refresh needing update is not error */
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static int info_only;
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static int force_remove;
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static int verbose;
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/* Three functions to allow overloaded pointer return; see linux/err.h */
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static inline void *ERR_PTR(long error)
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{
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return (void *) error;
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}
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static inline long PTR_ERR(const void *ptr)
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{
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return (long) ptr;
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}
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static inline long IS_ERR(const void *ptr)
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{
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return (unsigned long)ptr > (unsigned long)-1000L;
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}
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static void report(const char *fmt, ...)
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{
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va_list vp;
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if (!verbose)
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return;
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va_start(vp, fmt);
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vprintf(fmt, vp);
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putchar('\n');
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va_end(vp);
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}
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static int add_file_to_cache(const char *path)
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{
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int size, namelen, option, status;
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struct cache_entry *ce;
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struct stat st;
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status = lstat(path, &st);
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if (status < 0 || S_ISDIR(st.st_mode)) {
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/* When we used to have "path" and now we want to add
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* "path/file", we need a way to remove "path" before
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* being able to add "path/file". However,
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* "git-update-index --remove path" would not work.
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* --force-remove can be used but this is more user
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* friendly, especially since we can do the opposite
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* case just fine without --force-remove.
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*/
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if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
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if (allow_remove) {
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if (remove_file_from_cache(path))
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return error("%s: cannot remove from the index",
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path);
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else
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return 0;
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} else if (status < 0) {
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return error("%s: does not exist and --remove not passed",
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path);
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}
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}
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if (0 == status)
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return error("%s: is a directory - add files inside instead",
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path);
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else
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return error("lstat(\"%s\"): %s", path,
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strerror(errno));
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}
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namelen = strlen(path);
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size = cache_entry_size(namelen);
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ce = xmalloc(size);
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memset(ce, 0, size);
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memcpy(ce->name, path, namelen);
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fill_stat_cache_info(ce, &st);
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ce->ce_mode = create_ce_mode(st.st_mode);
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if (!trust_executable_bit) {
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/* If there is an existing entry, pick the mode bits
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* from it.
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*/
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int pos = cache_name_pos(path, namelen);
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if (0 <= pos)
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ce->ce_mode = active_cache[pos]->ce_mode;
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}
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ce->ce_flags = htons(namelen);
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if (index_path(ce->sha1, path, &st, !info_only))
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return -1;
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option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
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option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
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if (add_cache_entry(ce, option))
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return error("%s: cannot add to the index - missing --add option?",
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path);
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return 0;
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}
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/*
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* "refresh" does not calculate a new sha1 file or bring the
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* cache up-to-date for mode/content changes. But what it
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* _does_ do is to "re-match" the stat information of a file
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* with the cache, so that you can refresh the cache for a
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* file that hasn't been changed but where the stat entry is
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* out of date.
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*
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* For example, you'd want to do this after doing a "git-read-tree",
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* to link up the stat cache details with the proper files.
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*/
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static struct cache_entry *refresh_entry(struct cache_entry *ce)
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{
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struct stat st;
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struct cache_entry *updated;
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int changed, size;
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if (lstat(ce->name, &st) < 0)
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return ERR_PTR(-errno);
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changed = ce_match_stat(ce, &st);
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if (!changed)
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return NULL;
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if (ce_modified(ce, &st))
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return ERR_PTR(-EINVAL);
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size = ce_size(ce);
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updated = xmalloc(size);
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memcpy(updated, ce, size);
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fill_stat_cache_info(updated, &st);
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return updated;
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}
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static int refresh_cache(void)
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{
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int i;
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int has_errors = 0;
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for (i = 0; i < active_nr; i++) {
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struct cache_entry *ce, *new;
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ce = active_cache[i];
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if (ce_stage(ce)) {
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while ((i < active_nr) &&
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! strcmp(active_cache[i]->name, ce->name))
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i++;
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i--;
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if (allow_unmerged)
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continue;
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printf("%s: needs merge\n", ce->name);
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has_errors = 1;
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continue;
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}
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new = refresh_entry(ce);
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if (!new)
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continue;
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if (IS_ERR(new)) {
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if (not_new && PTR_ERR(new) == -ENOENT)
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continue;
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if (quiet)
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continue;
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printf("%s: needs update\n", ce->name);
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has_errors = 1;
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continue;
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}
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active_cache_changed = 1;
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/* You can NOT just free active_cache[i] here, since it
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* might not be necessarily malloc()ed but can also come
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* from mmap(). */
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active_cache[i] = new;
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}
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return has_errors;
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}
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/*
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* We fundamentally don't like some paths: we don't want
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* dot or dot-dot anywhere, and for obvious reasons don't
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* want to recurse into ".git" either.
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*
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* Also, we don't want double slashes or slashes at the
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* end that can make pathnames ambiguous.
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*/
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static int verify_dotfile(const char *rest)
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{
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/*
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* The first character was '.', but that
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* has already been discarded, we now test
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* the rest.
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*/
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switch (*rest) {
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/* "." is not allowed */
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case '\0': case '/':
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return 0;
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/*
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* ".git" followed by NUL or slash is bad. This
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* shares the path end test with the ".." case.
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*/
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case 'g':
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if (rest[1] != 'i')
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break;
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if (rest[2] != 't')
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break;
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rest += 2;
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/* fallthrough */
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case '.':
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if (rest[1] == '\0' || rest[1] == '/')
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return 0;
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}
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return 1;
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}
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static int verify_path(const char *path)
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{
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char c;
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goto inside;
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for (;;) {
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if (!c)
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return 1;
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if (c == '/') {
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inside:
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c = *path++;
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switch (c) {
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default:
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continue;
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case '/': case '\0':
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break;
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case '.':
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if (verify_dotfile(path))
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continue;
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}
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return 0;
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}
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c = *path++;
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}
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}
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static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
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const char *path, int stage)
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{
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int size, len, option;
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struct cache_entry *ce;
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if (!verify_path(path))
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return -1;
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len = strlen(path);
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size = cache_entry_size(len);
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ce = xmalloc(size);
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memset(ce, 0, size);
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memcpy(ce->sha1, sha1, 20);
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memcpy(ce->name, path, len);
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ce->ce_flags = create_ce_flags(len, stage);
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ce->ce_mode = create_ce_mode(mode);
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option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
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option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
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if (add_cache_entry(ce, option))
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return error("%s: cannot add to the index - missing --add option?",
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path);
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report("add '%s'", path);
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return 0;
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}
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static int chmod_path(int flip, const char *path)
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{
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int pos;
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struct cache_entry *ce;
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unsigned int mode;
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pos = cache_name_pos(path, strlen(path));
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if (pos < 0)
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return -1;
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ce = active_cache[pos];
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mode = ntohl(ce->ce_mode);
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if (!S_ISREG(mode))
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return -1;
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switch (flip) {
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case '+':
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ce->ce_mode |= htonl(0111); break;
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case '-':
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ce->ce_mode &= htonl(~0111); break;
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default:
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return -1;
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}
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active_cache_changed = 1;
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return 0;
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}
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static struct cache_file cache_file;
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static void update_one(const char *path, const char *prefix, int prefix_length)
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{
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const char *p = prefix_path(prefix, prefix_length, path);
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if (!verify_path(p)) {
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fprintf(stderr, "Ignoring path %s\n", path);
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return;
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}
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if (force_remove) {
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if (remove_file_from_cache(p))
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die("git-update-index: unable to remove %s", path);
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report("remove '%s'", path);
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return;
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}
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if (add_file_to_cache(p))
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die("Unable to process file %s", path);
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report("add '%s'", path);
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}
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static void read_index_info(int line_termination)
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{
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struct strbuf buf;
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strbuf_init(&buf);
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while (1) {
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char *ptr, *tab;
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char *path_name;
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unsigned char sha1[20];
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unsigned int mode;
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int stage;
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/* This reads lines formatted in one of three formats:
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*
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* (1) mode SP sha1 TAB path
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* The first format is what "git-apply --index-info"
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* reports, and used to reconstruct a partial tree
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* that is used for phony merge base tree when falling
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* back on 3-way merge.
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*
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* (2) mode SP type SP sha1 TAB path
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* The second format is to stuff git-ls-tree output
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* into the index file.
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*
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* (3) mode SP sha1 SP stage TAB path
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* This format is to put higher order stages into the
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* index file and matches git-ls-files --stage output.
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*/
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read_line(&buf, stdin, line_termination);
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if (buf.eof)
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break;
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mode = strtoul(buf.buf, &ptr, 8);
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if (ptr == buf.buf || *ptr != ' ')
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goto bad_line;
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tab = strchr(ptr, '\t');
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if (!tab || tab - ptr < 41)
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goto bad_line;
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if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
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stage = tab[-1] - '0';
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ptr = tab + 1; /* point at the head of path */
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tab = tab - 2; /* point at tail of sha1 */
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}
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else {
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stage = 0;
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ptr = tab + 1; /* point at the head of path */
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}
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if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
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goto bad_line;
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if (line_termination && ptr[0] == '"')
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path_name = unquote_c_style(ptr, NULL);
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else
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path_name = ptr;
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if (!verify_path(path_name)) {
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fprintf(stderr, "Ignoring path %s\n", path_name);
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if (path_name != ptr)
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free(path_name);
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continue;
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}
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if (!mode) {
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/* mode == 0 means there is no such path -- remove */
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if (remove_file_from_cache(path_name))
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die("git-update-index: unable to remove %s",
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ptr);
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}
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else {
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/* mode ' ' sha1 '\t' name
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* ptr[-1] points at tab,
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* ptr[-41] is at the beginning of sha1
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*/
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ptr[-42] = ptr[-1] = 0;
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if (add_cacheinfo(mode, sha1, path_name, stage))
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die("git-update-index: unable to update %s",
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path_name);
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}
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if (path_name != ptr)
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free(path_name);
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continue;
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bad_line:
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die("malformed index info %s", buf.buf);
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}
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}
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static const char update_index_usage[] =
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"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
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int main(int argc, const char **argv)
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{
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int i, newfd, entries, has_errors = 0, line_termination = '\n';
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int allow_options = 1;
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int read_from_stdin = 0;
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const char *prefix = setup_git_directory();
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int prefix_length = prefix ? strlen(prefix) : 0;
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git_config(git_default_config);
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newfd = hold_index_file_for_update(&cache_file, get_index_file());
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if (newfd < 0)
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die("unable to create new cachefile");
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entries = read_cache();
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if (entries < 0)
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die("cache corrupted");
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for (i = 1 ; i < argc; i++) {
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const char *path = argv[i];
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if (allow_options && *path == '-') {
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if (!strcmp(path, "--")) {
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allow_options = 0;
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continue;
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}
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if (!strcmp(path, "-q")) {
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quiet = 1;
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continue;
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}
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if (!strcmp(path, "--add")) {
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allow_add = 1;
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continue;
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}
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if (!strcmp(path, "--replace")) {
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allow_replace = 1;
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continue;
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}
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if (!strcmp(path, "--remove")) {
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allow_remove = 1;
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continue;
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}
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if (!strcmp(path, "--unmerged")) {
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allow_unmerged = 1;
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continue;
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}
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if (!strcmp(path, "--refresh")) {
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has_errors |= refresh_cache();
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continue;
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}
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if (!strcmp(path, "--cacheinfo")) {
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unsigned char sha1[20];
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unsigned int mode;
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if (i+3 >= argc)
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die("git-update-index: --cacheinfo <mode> <sha1> <path>");
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if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
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get_sha1_hex(argv[i+2], sha1) ||
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add_cacheinfo(mode, sha1, argv[i+3], 0))
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die("git-update-index: --cacheinfo"
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" cannot add %s", argv[i+3]);
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i += 3;
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continue;
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}
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if (!strcmp(path, "--chmod=-x") ||
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!strcmp(path, "--chmod=+x")) {
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if (argc <= i+1)
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die("git-update-index: %s <path>", path);
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if (chmod_path(path[8], argv[++i]))
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die("git-update-index: %s cannot chmod %s", path, argv[i]);
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continue;
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}
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if (!strcmp(path, "--info-only")) {
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info_only = 1;
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continue;
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}
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if (!strcmp(path, "--force-remove")) {
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force_remove = 1;
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continue;
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}
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if (!strcmp(path, "-z")) {
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line_termination = 0;
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continue;
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}
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if (!strcmp(path, "--stdin")) {
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if (i != argc - 1)
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die("--stdin must be at the end");
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read_from_stdin = 1;
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break;
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}
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if (!strcmp(path, "--index-info")) {
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allow_add = allow_replace = allow_remove = 1;
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read_index_info(line_termination);
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continue;
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}
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if (!strcmp(path, "--ignore-missing")) {
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not_new = 1;
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continue;
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}
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if (!strcmp(path, "--verbose")) {
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verbose = 1;
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continue;
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}
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if (!strcmp(path, "-h") || !strcmp(path, "--help"))
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usage(update_index_usage);
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die("unknown option %s", path);
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}
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update_one(path, prefix, prefix_length);
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}
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if (read_from_stdin) {
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struct strbuf buf;
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strbuf_init(&buf);
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while (1) {
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char *path_name;
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read_line(&buf, stdin, line_termination);
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if (buf.eof)
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break;
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if (line_termination && buf.buf[0] == '"')
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path_name = unquote_c_style(buf.buf, NULL);
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else
|
|
path_name = buf.buf;
|
|
update_one(path_name, prefix, prefix_length);
|
|
if (path_name != buf.buf)
|
|
free(path_name);
|
|
}
|
|
}
|
|
if (active_cache_changed) {
|
|
if (write_cache(newfd, active_cache, active_nr) ||
|
|
commit_index_file(&cache_file))
|
|
die("Unable to write new cachefile");
|
|
}
|
|
|
|
return has_errors ? 1 : 0;
|
|
}
|