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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>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
#ifndef CACHE_TREE_H
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#define CACHE_TREE_H
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#include "tree.h"
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#include "tree-walk.h"
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struct cache_tree;
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struct cache_tree_sub {
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struct cache_tree *cache_tree;
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int count; /* internally used by update_one() */
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int namelen;
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int used;
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char name[FLEX_ARRAY];
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};
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struct cache_tree {
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int entry_count; /* negative means "invalid" */
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unsigned char sha1[20];
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int subtree_nr;
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int subtree_alloc;
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struct cache_tree_sub **down;
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};
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struct cache_tree *cache_tree(void);
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void cache_tree_free(struct cache_tree **);
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void cache_tree_invalidate_path(struct cache_tree *, const char *);
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struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
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void cache_tree_write(struct strbuf *, struct cache_tree *root);
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struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
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int cache_tree_fully_valid(struct cache_tree *);
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int cache_tree_update(struct cache_tree *, const struct cache_entry * const *, int, int);
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int update_main_cache_tree(int);
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/* bitmasks to write_cache_as_tree flags */
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#define WRITE_TREE_MISSING_OK 1
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#define WRITE_TREE_IGNORE_CACHE_TREE 2
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#define WRITE_TREE_DRY_RUN 4
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#define WRITE_TREE_SILENT 8
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/* error return codes */
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#define WRITE_TREE_UNREADABLE_INDEX (-1)
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#define WRITE_TREE_UNMERGED_INDEX (-2)
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#define WRITE_TREE_PREFIX_ERROR (-3)
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int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix);
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void prime_cache_tree(struct cache_tree **, struct tree *);
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extern int cache_tree_matches_traversal(struct cache_tree *, struct name_entry *ent, struct traverse_info *info);
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#endif
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