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5102c6173c
When using a case preserving but case insensitive file system, directory case can differ but still refer to the same physical directory. git status reports the directory with the alternate case as an Untracked file. (That is, when mydir/filea.txt is added to the repository and then the directory on disk is renamed from mydir/ to MyDir/, git status shows MyDir/ as being untracked.) Support has been added in name-hash.c for hashing directories with a terminating slash into the name hash. When index_name_exists() is called with a directory (a name with a terminating slash), the name is not found via the normal cache_name_compare() call, but it is found in the slow_same_name() function. Additionally, in dir.c, directory_exists_in_index_icase() allows newly added directories deeper in the directory chain to be identified. Ultimately, it would be better if the file list was read in case insensitive alphabetical order from disk, but this change seems to suffice for now. The end result is the directory is looked up in a case insensitive manner and does not show in the Untracked files list. Signed-off-by: Joshua Jensen <jjensen@workspacewhiz.com> Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
189 lines
4.6 KiB
C
189 lines
4.6 KiB
C
/*
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* name-hash.c
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*
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* Hashing names in the index state
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*
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* Copyright (C) 2008 Linus Torvalds
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*/
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#define NO_THE_INDEX_COMPATIBILITY_MACROS
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#include "cache.h"
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/*
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* This removes bit 5 if bit 6 is set.
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*
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* That will make US-ASCII characters hash to their upper-case
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* equivalent. We could easily do this one whole word at a time,
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* but that's for future worries.
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*/
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static inline unsigned char icase_hash(unsigned char c)
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{
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return c & ~((c & 0x40) >> 1);
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}
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static unsigned int hash_name(const char *name, int namelen)
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{
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unsigned int hash = 0x123;
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do {
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unsigned char c = *name++;
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c = icase_hash(c);
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hash = hash*101 + c;
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} while (--namelen);
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return hash;
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}
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static void hash_index_entry_directories(struct index_state *istate, struct cache_entry *ce)
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{
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/*
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* Throw each directory component in the hash for quick lookup
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* during a git status. Directory components are stored with their
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* closing slash. Despite submodules being a directory, they never
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* reach this point, because they are stored without a closing slash
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* in the cache.
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*
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* Note that the cache_entry stored with the directory does not
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* represent the directory itself. It is a pointer to an existing
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* filename, and its only purpose is to represent existence of the
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* directory in the cache. It is very possible multiple directory
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* hash entries may point to the same cache_entry.
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*/
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unsigned int hash;
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void **pos;
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const char *ptr = ce->name;
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while (*ptr) {
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while (*ptr && *ptr != '/')
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++ptr;
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if (*ptr == '/') {
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++ptr;
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hash = hash_name(ce->name, ptr - ce->name);
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if (!lookup_hash(hash, &istate->name_hash)) {
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pos = insert_hash(hash, ce, &istate->name_hash);
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if (pos) {
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ce->next = *pos;
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*pos = ce;
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}
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}
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}
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}
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}
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static void hash_index_entry(struct index_state *istate, struct cache_entry *ce)
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{
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void **pos;
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unsigned int hash;
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if (ce->ce_flags & CE_HASHED)
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return;
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ce->ce_flags |= CE_HASHED;
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ce->next = NULL;
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hash = hash_name(ce->name, ce_namelen(ce));
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pos = insert_hash(hash, ce, &istate->name_hash);
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if (pos) {
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ce->next = *pos;
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*pos = ce;
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}
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if (ignore_case)
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hash_index_entry_directories(istate, ce);
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}
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static void lazy_init_name_hash(struct index_state *istate)
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{
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int nr;
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if (istate->name_hash_initialized)
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return;
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for (nr = 0; nr < istate->cache_nr; nr++)
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hash_index_entry(istate, istate->cache[nr]);
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istate->name_hash_initialized = 1;
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}
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void add_name_hash(struct index_state *istate, struct cache_entry *ce)
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{
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ce->ce_flags &= ~CE_UNHASHED;
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if (istate->name_hash_initialized)
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hash_index_entry(istate, ce);
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}
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static int slow_same_name(const char *name1, int len1, const char *name2, int len2)
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{
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if (len1 != len2)
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return 0;
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while (len1) {
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unsigned char c1 = *name1++;
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unsigned char c2 = *name2++;
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len1--;
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if (c1 != c2) {
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c1 = toupper(c1);
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c2 = toupper(c2);
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if (c1 != c2)
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return 0;
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}
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}
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return 1;
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}
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static int same_name(const struct cache_entry *ce, const char *name, int namelen, int icase)
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{
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int len = ce_namelen(ce);
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/*
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* Always do exact compare, even if we want a case-ignoring comparison;
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* we do the quick exact one first, because it will be the common case.
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*/
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if (len == namelen && !cache_name_compare(name, namelen, ce->name, len))
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return 1;
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if (!icase)
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return 0;
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/*
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* If the entry we're comparing is a filename (no trailing slash), then compare
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* the lengths exactly.
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*/
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if (name[namelen - 1] != '/')
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return slow_same_name(name, namelen, ce->name, len);
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/*
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* For a directory, we point to an arbitrary cache_entry filename. Just
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* make sure the directory portion matches.
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*/
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return slow_same_name(name, namelen, ce->name, namelen < len ? namelen : len);
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}
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struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int icase)
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{
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unsigned int hash = hash_name(name, namelen);
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struct cache_entry *ce;
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lazy_init_name_hash(istate);
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ce = lookup_hash(hash, &istate->name_hash);
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while (ce) {
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if (!(ce->ce_flags & CE_UNHASHED)) {
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if (same_name(ce, name, namelen, icase))
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return ce;
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}
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ce = ce->next;
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}
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/*
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* Might be a submodule. Despite submodules being directories,
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* they are stored in the name hash without a closing slash.
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* When ignore_case is 1, directories are stored in the name hash
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* with their closing slash.
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*
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* The side effect of this storage technique is we have need to
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* remove the slash from name and perform the lookup again without
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* the slash. If a match is made, S_ISGITLINK(ce->mode) will be
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* true.
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*/
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if (icase && name[namelen - 1] == '/') {
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ce = index_name_exists(istate, name, namelen - 1, icase);
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if (ce && S_ISGITLINK(ce->ce_mode))
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return ce;
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}
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return NULL;
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}
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