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    • Duy Nguyen's avatar
      Convert "struct cache_entry *" to "const ..." wherever possible · 9c5e6c80
      Duy Nguyen authored
      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: Duy Nguyen's avatarNguyễn Thái Ngọc Duy <pclouds@gmail.com>
      Signed-off-by: default avatarJunio C Hamano <gitster@pobox.com>
      9c5e6c80
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