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9c5e6c802c
I attempted to make index_state->cache[] a "const struct cache_entry **"
to find out how existing entries in index are modified and where. The
question I have is what do we do if we really need to keep track of on-disk
changes in the index. The result is
- diff-lib.c: setting CE_UPTODATE
- name-hash.c: setting CE_HASHED
- preload-index.c, read-cache.c, unpack-trees.c and
builtin/update-index: obvious
- entry.c: write_entry() may refresh the checked out entry via
fill_stat_cache_info(). This causes "non-const struct cache_entry
*" in builtin/apply.c, builtin/checkout-index.c and
builtin/checkout.c
- builtin/ls-files.c: --with-tree changes stagemask and may set
CE_UPDATE
Of these, write_entry() and its call sites are probably most
interesting because it modifies on-disk info. But this is stat info
and can be retrieved via refresh, at least for porcelain
commands. Other just uses ce_flags for local purposes.
So, keeping track of "dirty" entries is just a matter of setting a
flag in index modification functions exposed by read-cache.c. Except
unpack-trees, the rest of the code base does not do anything funny
behind read-cache's back.
The actual patch is less valueable than the summary above. But if
anyone wants to re-identify the above sites. Applying this patch, then
this:
diff --git a/cache.h b/cache.h
index 430d021..1692891 100644
--- a/cache.h
+++ b/cache.h
@@ -267,7 +267,7 @@ static inline unsigned int canon_mode(unsigned int mode)
#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
struct index_state {
- struct cache_entry **cache;
+ const struct cache_entry **cache;
unsigned int version;
unsigned int cache_nr, cache_alloc, cache_changed;
struct string_list *resolve_undo;
will help quickly identify them without bogus warnings.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
101 lines
3 KiB
C
101 lines
3 KiB
C
#include "cache.h"
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#include "dir.h"
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#include "pathspec.h"
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/*
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* Finds which of the given pathspecs match items in the index.
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*
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* For each pathspec, sets the corresponding entry in the seen[] array
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* (which should be specs items long, i.e. the same size as pathspec)
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* to the nature of the "closest" (i.e. most specific) match found for
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* that pathspec in the index, if it was a closer type of match than
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* the existing entry. As an optimization, matching is skipped
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* altogether if seen[] already only contains non-zero entries.
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*
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* If seen[] has not already been written to, it may make sense
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* to use find_pathspecs_matching_against_index() instead.
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*/
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void add_pathspec_matches_against_index(const char **pathspec,
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char *seen, int specs)
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{
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int num_unmatched = 0, i;
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/*
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* Since we are walking the index as if we were walking the directory,
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* we have to mark the matched pathspec as seen; otherwise we will
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* mistakenly think that the user gave a pathspec that did not match
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* anything.
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*/
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for (i = 0; i < specs; i++)
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if (!seen[i])
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num_unmatched++;
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if (!num_unmatched)
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return;
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for (i = 0; i < active_nr; i++) {
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const struct cache_entry *ce = active_cache[i];
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match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen);
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}
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}
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/*
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* Finds which of the given pathspecs match items in the index.
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*
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* This is a one-shot wrapper around add_pathspec_matches_against_index()
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* which allocates, populates, and returns a seen[] array indicating the
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* nature of the "closest" (i.e. most specific) matches which each of the
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* given pathspecs achieves against all items in the index.
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*/
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char *find_pathspecs_matching_against_index(const char **pathspec)
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{
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char *seen;
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int i;
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for (i = 0; pathspec[i]; i++)
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; /* just counting */
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seen = xcalloc(i, 1);
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add_pathspec_matches_against_index(pathspec, seen, i);
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return seen;
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}
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/*
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* Check the index to see whether path refers to a submodule, or
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* something inside a submodule. If the former, returns the path with
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* any trailing slash stripped. If the latter, dies with an error
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* message.
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*/
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const char *check_path_for_gitlink(const char *path)
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{
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int i, path_len = strlen(path);
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for (i = 0; i < active_nr; i++) {
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const struct cache_entry *ce = active_cache[i];
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if (S_ISGITLINK(ce->ce_mode)) {
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int ce_len = ce_namelen(ce);
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if (path_len <= ce_len || path[ce_len] != '/' ||
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memcmp(ce->name, path, ce_len))
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/* path does not refer to this
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* submodule or anything inside it */
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continue;
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if (path_len == ce_len + 1) {
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/* path refers to submodule;
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* strip trailing slash */
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return xstrndup(ce->name, ce_len);
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} else {
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die (_("Path '%s' is in submodule '%.*s'"),
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path, ce_len, ce->name);
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}
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}
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}
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return path;
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}
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/*
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* Dies if the given path refers to a file inside a symlinked
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* directory in the index.
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*/
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void die_if_path_beyond_symlink(const char *path, const char *prefix)
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{
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if (has_symlink_leading_path(path, strlen(path))) {
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int len = prefix ? strlen(prefix) : 0;
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die(_("'%s' is beyond a symbolic link"), path + len);
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}
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}
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