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With core.ignorecase=true, name-hash.c builds a case insensitive index of all tracked directories. Currently, the existing cache entry structures are added multiple times to the same hashtable (with different name lengths and hash codes). However, there's only one dir_next pointer, which gets completely messed up in case of hash collisions. In the worst case, this causes an endless loop if ce == ce->dir_next (see t7062). Use a separate hashtable and separate structures for the directory index so that each directory entry has its own next pointer. Use reference counting to track which directory entry contains files. There are only slight changes to the name-hash.c API: - new free_name_hash() used by read_cache.c::discard_index() - remove_name_hash() takes an additional index_state parameter - index_name_exists() for a directory (trailing '/') may return a cache entry that has been removed (CE_UNHASHED). This is not a problem as the return value is only used to check if the directory exists (dir.c) or to normalize casing of directory names (read-cache.c). Getting rid of cache_entry.dir_next reduces memory consumption, especially with core.ignorecase=false (which doesn't use that member at all). With core.ignorecase=true, building the directory index is slightly faster as we add / check the parent directory first (instead of going through all directory levels for each file in the index). E.g. with WebKit (~200k files, ~7k dirs), time spent in lazy_init_name_hash is reduced from 176ms to 130ms. Signed-off-by: Karsten Blees <blees@dcon.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
20 lines
444 B
Bash
Executable file
20 lines
444 B
Bash
Executable file
#!/bin/sh
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test_description='git-status with core.ignorecase=true'
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. ./test-lib.sh
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test_expect_success 'status with hash collisions' '
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# note: "V/", "V/XQANY/" and "WURZAUP/" produce the same hash code
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# in name-hash.c::hash_name
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mkdir V &&
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mkdir V/XQANY &&
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mkdir WURZAUP &&
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touch V/XQANY/test &&
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git config core.ignorecase true &&
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git add . &&
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# test is successful if git status completes (no endless loop)
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git status
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'
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test_done
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