git/dir.c
Junio C Hamano 3a27eec48e Merge branch 'dt/name-hash-dir-entry-fix' into maint
The name-hash subsystem that is used to cope with case insensitive
filesystems keeps track of directories and their on-filesystem
cases for all the paths in the index by holding a pointer to a
randomly chosen cache entry that is inside the directory (for its
ce->ce_name component).  This pointer was not updated even when the
cache entry was removed from the index, leading to use after free.
This was fixed by recording the path for each directory instead of
borrowing cache entries and restructuring the API somewhat.

* dt/name-hash-dir-entry-fix:
  name-hash: don't reuse cache_entry in dir_entry
2015-11-03 15:32:40 -08:00

2690 lines
69 KiB
C

/*
* This handles recursive filename detection with exclude
* files, index knowledge etc..
*
* See Documentation/technical/api-directory-listing.txt
*
* Copyright (C) Linus Torvalds, 2005-2006
* Junio Hamano, 2005-2006
*/
#include "cache.h"
#include "dir.h"
#include "refs.h"
#include "wildmatch.h"
#include "pathspec.h"
#include "utf8.h"
#include "varint.h"
#include "ewah/ewok.h"
struct path_simplify {
int len;
const char *path;
};
/*
* Tells read_directory_recursive how a file or directory should be treated.
* Values are ordered by significance, e.g. if a directory contains both
* excluded and untracked files, it is listed as untracked because
* path_untracked > path_excluded.
*/
enum path_treatment {
path_none = 0,
path_recurse,
path_excluded,
path_untracked
};
/*
* Support data structure for our opendir/readdir/closedir wrappers
*/
struct cached_dir {
DIR *fdir;
struct untracked_cache_dir *untracked;
int nr_files;
int nr_dirs;
struct dirent *de;
const char *file;
struct untracked_cache_dir *ucd;
};
static enum path_treatment read_directory_recursive(struct dir_struct *dir,
const char *path, int len, struct untracked_cache_dir *untracked,
int check_only, const struct path_simplify *simplify);
static int get_dtype(struct dirent *de, const char *path, int len);
/* helper string functions with support for the ignore_case flag */
int strcmp_icase(const char *a, const char *b)
{
return ignore_case ? strcasecmp(a, b) : strcmp(a, b);
}
int strncmp_icase(const char *a, const char *b, size_t count)
{
return ignore_case ? strncasecmp(a, b, count) : strncmp(a, b, count);
}
int fnmatch_icase(const char *pattern, const char *string, int flags)
{
return wildmatch(pattern, string,
flags | (ignore_case ? WM_CASEFOLD : 0),
NULL);
}
int git_fnmatch(const struct pathspec_item *item,
const char *pattern, const char *string,
int prefix)
{
if (prefix > 0) {
if (ps_strncmp(item, pattern, string, prefix))
return WM_NOMATCH;
pattern += prefix;
string += prefix;
}
if (item->flags & PATHSPEC_ONESTAR) {
int pattern_len = strlen(++pattern);
int string_len = strlen(string);
return string_len < pattern_len ||
ps_strcmp(item, pattern,
string + string_len - pattern_len);
}
if (item->magic & PATHSPEC_GLOB)
return wildmatch(pattern, string,
WM_PATHNAME |
(item->magic & PATHSPEC_ICASE ? WM_CASEFOLD : 0),
NULL);
else
/* wildmatch has not learned no FNM_PATHNAME mode yet */
return wildmatch(pattern, string,
item->magic & PATHSPEC_ICASE ? WM_CASEFOLD : 0,
NULL);
}
static int fnmatch_icase_mem(const char *pattern, int patternlen,
const char *string, int stringlen,
int flags)
{
int match_status;
struct strbuf pat_buf = STRBUF_INIT;
struct strbuf str_buf = STRBUF_INIT;
const char *use_pat = pattern;
const char *use_str = string;
if (pattern[patternlen]) {
strbuf_add(&pat_buf, pattern, patternlen);
use_pat = pat_buf.buf;
}
if (string[stringlen]) {
strbuf_add(&str_buf, string, stringlen);
use_str = str_buf.buf;
}
if (ignore_case)
flags |= WM_CASEFOLD;
match_status = wildmatch(use_pat, use_str, flags, NULL);
strbuf_release(&pat_buf);
strbuf_release(&str_buf);
return match_status;
}
static size_t common_prefix_len(const struct pathspec *pathspec)
{
int n;
size_t max = 0;
/*
* ":(icase)path" is treated as a pathspec full of
* wildcard. In other words, only prefix is considered common
* prefix. If the pathspec is abc/foo abc/bar, running in
* subdir xyz, the common prefix is still xyz, not xuz/abc as
* in non-:(icase).
*/
GUARD_PATHSPEC(pathspec,
PATHSPEC_FROMTOP |
PATHSPEC_MAXDEPTH |
PATHSPEC_LITERAL |
PATHSPEC_GLOB |
PATHSPEC_ICASE |
PATHSPEC_EXCLUDE);
for (n = 0; n < pathspec->nr; n++) {
size_t i = 0, len = 0, item_len;
if (pathspec->items[n].magic & PATHSPEC_EXCLUDE)
continue;
if (pathspec->items[n].magic & PATHSPEC_ICASE)
item_len = pathspec->items[n].prefix;
else
item_len = pathspec->items[n].nowildcard_len;
while (i < item_len && (n == 0 || i < max)) {
char c = pathspec->items[n].match[i];
if (c != pathspec->items[0].match[i])
break;
if (c == '/')
len = i + 1;
i++;
}
if (n == 0 || len < max) {
max = len;
if (!max)
break;
}
}
return max;
}
/*
* Returns a copy of the longest leading path common among all
* pathspecs.
*/
char *common_prefix(const struct pathspec *pathspec)
{
unsigned long len = common_prefix_len(pathspec);
return len ? xmemdupz(pathspec->items[0].match, len) : NULL;
}
int fill_directory(struct dir_struct *dir, const struct pathspec *pathspec)
{
size_t len;
/*
* Calculate common prefix for the pathspec, and
* use that to optimize the directory walk
*/
len = common_prefix_len(pathspec);
/* Read the directory and prune it */
read_directory(dir, pathspec->nr ? pathspec->_raw[0] : "", len, pathspec);
return len;
}
int within_depth(const char *name, int namelen,
int depth, int max_depth)
{
const char *cp = name, *cpe = name + namelen;
while (cp < cpe) {
if (*cp++ != '/')
continue;
depth++;
if (depth > max_depth)
return 0;
}
return 1;
}
#define DO_MATCH_EXCLUDE 1
#define DO_MATCH_DIRECTORY 2
/*
* Does 'match' match the given name?
* A match is found if
*
* (1) the 'match' string is leading directory of 'name', or
* (2) the 'match' string is a wildcard and matches 'name', or
* (3) the 'match' string is exactly the same as 'name'.
*
* and the return value tells which case it was.
*
* It returns 0 when there is no match.
*/
static int match_pathspec_item(const struct pathspec_item *item, int prefix,
const char *name, int namelen, unsigned flags)
{
/* name/namelen has prefix cut off by caller */
const char *match = item->match + prefix;
int matchlen = item->len - prefix;
/*
* The normal call pattern is:
* 1. prefix = common_prefix_len(ps);
* 2. prune something, or fill_directory
* 3. match_pathspec()
*
* 'prefix' at #1 may be shorter than the command's prefix and
* it's ok for #2 to match extra files. Those extras will be
* trimmed at #3.
*
* Suppose the pathspec is 'foo' and '../bar' running from
* subdir 'xyz'. The common prefix at #1 will be empty, thanks
* to "../". We may have xyz/foo _and_ XYZ/foo after #2. The
* user does not want XYZ/foo, only the "foo" part should be
* case-insensitive. We need to filter out XYZ/foo here. In
* other words, we do not trust the caller on comparing the
* prefix part when :(icase) is involved. We do exact
* comparison ourselves.
*
* Normally the caller (common_prefix_len() in fact) does
* _exact_ matching on name[-prefix+1..-1] and we do not need
* to check that part. Be defensive and check it anyway, in
* case common_prefix_len is changed, or a new caller is
* introduced that does not use common_prefix_len.
*
* If the penalty turns out too high when prefix is really
* long, maybe change it to
* strncmp(match, name, item->prefix - prefix)
*/
if (item->prefix && (item->magic & PATHSPEC_ICASE) &&
strncmp(item->match, name - prefix, item->prefix))
return 0;
/* If the match was just the prefix, we matched */
if (!*match)
return MATCHED_RECURSIVELY;
if (matchlen <= namelen && !ps_strncmp(item, match, name, matchlen)) {
if (matchlen == namelen)
return MATCHED_EXACTLY;
if (match[matchlen-1] == '/' || name[matchlen] == '/')
return MATCHED_RECURSIVELY;
} else if ((flags & DO_MATCH_DIRECTORY) &&
match[matchlen - 1] == '/' &&
namelen == matchlen - 1 &&
!ps_strncmp(item, match, name, namelen))
return MATCHED_EXACTLY;
if (item->nowildcard_len < item->len &&
!git_fnmatch(item, match, name,
item->nowildcard_len - prefix))
return MATCHED_FNMATCH;
return 0;
}
/*
* Given a name and a list of pathspecs, returns the nature of the
* closest (i.e. most specific) match of the name to any of the
* pathspecs.
*
* The caller typically calls this multiple times with the same
* pathspec and seen[] array but with different name/namelen
* (e.g. entries from the index) and is interested in seeing if and
* how each pathspec matches all the names it calls this function
* with. A mark is left in the seen[] array for each pathspec element
* indicating the closest type of match that element achieved, so if
* seen[n] remains zero after multiple invocations, that means the nth
* pathspec did not match any names, which could indicate that the
* user mistyped the nth pathspec.
*/
static int do_match_pathspec(const struct pathspec *ps,
const char *name, int namelen,
int prefix, char *seen,
unsigned flags)
{
int i, retval = 0, exclude = flags & DO_MATCH_EXCLUDE;
GUARD_PATHSPEC(ps,
PATHSPEC_FROMTOP |
PATHSPEC_MAXDEPTH |
PATHSPEC_LITERAL |
PATHSPEC_GLOB |
PATHSPEC_ICASE |
PATHSPEC_EXCLUDE);
if (!ps->nr) {
if (!ps->recursive ||
!(ps->magic & PATHSPEC_MAXDEPTH) ||
ps->max_depth == -1)
return MATCHED_RECURSIVELY;
if (within_depth(name, namelen, 0, ps->max_depth))
return MATCHED_EXACTLY;
else
return 0;
}
name += prefix;
namelen -= prefix;
for (i = ps->nr - 1; i >= 0; i--) {
int how;
if ((!exclude && ps->items[i].magic & PATHSPEC_EXCLUDE) ||
( exclude && !(ps->items[i].magic & PATHSPEC_EXCLUDE)))
continue;
if (seen && seen[i] == MATCHED_EXACTLY)
continue;
/*
* Make exclude patterns optional and never report
* "pathspec ':(exclude)foo' matches no files"
*/
if (seen && ps->items[i].magic & PATHSPEC_EXCLUDE)
seen[i] = MATCHED_FNMATCH;
how = match_pathspec_item(ps->items+i, prefix, name,
namelen, flags);
if (ps->recursive &&
(ps->magic & PATHSPEC_MAXDEPTH) &&
ps->max_depth != -1 &&
how && how != MATCHED_FNMATCH) {
int len = ps->items[i].len;
if (name[len] == '/')
len++;
if (within_depth(name+len, namelen-len, 0, ps->max_depth))
how = MATCHED_EXACTLY;
else
how = 0;
}
if (how) {
if (retval < how)
retval = how;
if (seen && seen[i] < how)
seen[i] = how;
}
}
return retval;
}
int match_pathspec(const struct pathspec *ps,
const char *name, int namelen,
int prefix, char *seen, int is_dir)
{
int positive, negative;
unsigned flags = is_dir ? DO_MATCH_DIRECTORY : 0;
positive = do_match_pathspec(ps, name, namelen,
prefix, seen, flags);
if (!(ps->magic & PATHSPEC_EXCLUDE) || !positive)
return positive;
negative = do_match_pathspec(ps, name, namelen,
prefix, seen,
flags | DO_MATCH_EXCLUDE);
return negative ? 0 : positive;
}
int report_path_error(const char *ps_matched,
const struct pathspec *pathspec,
const char *prefix)
{
/*
* Make sure all pathspec matched; otherwise it is an error.
*/
int num, errors = 0;
for (num = 0; num < pathspec->nr; num++) {
int other, found_dup;
if (ps_matched[num])
continue;
/*
* The caller might have fed identical pathspec
* twice. Do not barf on such a mistake.
* FIXME: parse_pathspec should have eliminated
* duplicate pathspec.
*/
for (found_dup = other = 0;
!found_dup && other < pathspec->nr;
other++) {
if (other == num || !ps_matched[other])
continue;
if (!strcmp(pathspec->items[other].original,
pathspec->items[num].original))
/*
* Ok, we have a match already.
*/
found_dup = 1;
}
if (found_dup)
continue;
error("pathspec '%s' did not match any file(s) known to git.",
pathspec->items[num].original);
errors++;
}
return errors;
}
/*
* Return the length of the "simple" part of a path match limiter.
*/
int simple_length(const char *match)
{
int len = -1;
for (;;) {
unsigned char c = *match++;
len++;
if (c == '\0' || is_glob_special(c))
return len;
}
}
int no_wildcard(const char *string)
{
return string[simple_length(string)] == '\0';
}
void parse_exclude_pattern(const char **pattern,
int *patternlen,
int *flags,
int *nowildcardlen)
{
const char *p = *pattern;
size_t i, len;
*flags = 0;
if (*p == '!') {
*flags |= EXC_FLAG_NEGATIVE;
p++;
}
len = strlen(p);
if (len && p[len - 1] == '/') {
len--;
*flags |= EXC_FLAG_MUSTBEDIR;
}
for (i = 0; i < len; i++) {
if (p[i] == '/')
break;
}
if (i == len)
*flags |= EXC_FLAG_NODIR;
*nowildcardlen = simple_length(p);
/*
* we should have excluded the trailing slash from 'p' too,
* but that's one more allocation. Instead just make sure
* nowildcardlen does not exceed real patternlen
*/
if (*nowildcardlen > len)
*nowildcardlen = len;
if (*p == '*' && no_wildcard(p + 1))
*flags |= EXC_FLAG_ENDSWITH;
*pattern = p;
*patternlen = len;
}
void add_exclude(const char *string, const char *base,
int baselen, struct exclude_list *el, int srcpos)
{
struct exclude *x;
int patternlen;
int flags;
int nowildcardlen;
parse_exclude_pattern(&string, &patternlen, &flags, &nowildcardlen);
if (flags & EXC_FLAG_MUSTBEDIR) {
char *s;
x = xmalloc(sizeof(*x) + patternlen + 1);
s = (char *)(x+1);
memcpy(s, string, patternlen);
s[patternlen] = '\0';
x->pattern = s;
} else {
x = xmalloc(sizeof(*x));
x->pattern = string;
}
x->patternlen = patternlen;
x->nowildcardlen = nowildcardlen;
x->base = base;
x->baselen = baselen;
x->flags = flags;
x->srcpos = srcpos;
ALLOC_GROW(el->excludes, el->nr + 1, el->alloc);
el->excludes[el->nr++] = x;
x->el = el;
}
static void *read_skip_worktree_file_from_index(const char *path, size_t *size,
struct sha1_stat *sha1_stat)
{
int pos, len;
unsigned long sz;
enum object_type type;
void *data;
len = strlen(path);
pos = cache_name_pos(path, len);
if (pos < 0)
return NULL;
if (!ce_skip_worktree(active_cache[pos]))
return NULL;
data = read_sha1_file(active_cache[pos]->sha1, &type, &sz);
if (!data || type != OBJ_BLOB) {
free(data);
return NULL;
}
*size = xsize_t(sz);
if (sha1_stat) {
memset(&sha1_stat->stat, 0, sizeof(sha1_stat->stat));
hashcpy(sha1_stat->sha1, active_cache[pos]->sha1);
}
return data;
}
/*
* Frees memory within el which was allocated for exclude patterns and
* the file buffer. Does not free el itself.
*/
void clear_exclude_list(struct exclude_list *el)
{
int i;
for (i = 0; i < el->nr; i++)
free(el->excludes[i]);
free(el->excludes);
free(el->filebuf);
el->nr = 0;
el->excludes = NULL;
el->filebuf = NULL;
}
static void trim_trailing_spaces(char *buf)
{
char *p, *last_space = NULL;
for (p = buf; *p; p++)
switch (*p) {
case ' ':
if (!last_space)
last_space = p;
break;
case '\\':
p++;
if (!*p)
return;
/* fallthrough */
default:
last_space = NULL;
}
if (last_space)
*last_space = '\0';
}
/*
* Given a subdirectory name and "dir" of the current directory,
* search the subdir in "dir" and return it, or create a new one if it
* does not exist in "dir".
*
* If "name" has the trailing slash, it'll be excluded in the search.
*/
static struct untracked_cache_dir *lookup_untracked(struct untracked_cache *uc,
struct untracked_cache_dir *dir,
const char *name, int len)
{
int first, last;
struct untracked_cache_dir *d;
if (!dir)
return NULL;
if (len && name[len - 1] == '/')
len--;
first = 0;
last = dir->dirs_nr;
while (last > first) {
int cmp, next = (last + first) >> 1;
d = dir->dirs[next];
cmp = strncmp(name, d->name, len);
if (!cmp && strlen(d->name) > len)
cmp = -1;
if (!cmp)
return d;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
uc->dir_created++;
d = xmalloc(sizeof(*d) + len + 1);
memset(d, 0, sizeof(*d));
memcpy(d->name, name, len);
d->name[len] = '\0';
ALLOC_GROW(dir->dirs, dir->dirs_nr + 1, dir->dirs_alloc);
memmove(dir->dirs + first + 1, dir->dirs + first,
(dir->dirs_nr - first) * sizeof(*dir->dirs));
dir->dirs_nr++;
dir->dirs[first] = d;
return d;
}
static void do_invalidate_gitignore(struct untracked_cache_dir *dir)
{
int i;
dir->valid = 0;
dir->untracked_nr = 0;
for (i = 0; i < dir->dirs_nr; i++)
do_invalidate_gitignore(dir->dirs[i]);
}
static void invalidate_gitignore(struct untracked_cache *uc,
struct untracked_cache_dir *dir)
{
uc->gitignore_invalidated++;
do_invalidate_gitignore(dir);
}
static void invalidate_directory(struct untracked_cache *uc,
struct untracked_cache_dir *dir)
{
int i;
uc->dir_invalidated++;
dir->valid = 0;
dir->untracked_nr = 0;
for (i = 0; i < dir->dirs_nr; i++)
dir->dirs[i]->recurse = 0;
}
/*
* Given a file with name "fname", read it (either from disk, or from
* the index if "check_index" is non-zero), parse it and store the
* exclude rules in "el".
*
* If "ss" is not NULL, compute SHA-1 of the exclude file and fill
* stat data from disk (only valid if add_excludes returns zero). If
* ss_valid is non-zero, "ss" must contain good value as input.
*/
static int add_excludes(const char *fname, const char *base, int baselen,
struct exclude_list *el, int check_index,
struct sha1_stat *sha1_stat)
{
struct stat st;
int fd, i, lineno = 1;
size_t size = 0;
char *buf, *entry;
fd = open(fname, O_RDONLY);
if (fd < 0 || fstat(fd, &st) < 0) {
if (errno != ENOENT)
warn_on_inaccessible(fname);
if (0 <= fd)
close(fd);
if (!check_index ||
(buf = read_skip_worktree_file_from_index(fname, &size, sha1_stat)) == NULL)
return -1;
if (size == 0) {
free(buf);
return 0;
}
if (buf[size-1] != '\n') {
buf = xrealloc(buf, size+1);
buf[size++] = '\n';
}
} else {
size = xsize_t(st.st_size);
if (size == 0) {
if (sha1_stat) {
fill_stat_data(&sha1_stat->stat, &st);
hashcpy(sha1_stat->sha1, EMPTY_BLOB_SHA1_BIN);
sha1_stat->valid = 1;
}
close(fd);
return 0;
}
buf = xmalloc(size+1);
if (read_in_full(fd, buf, size) != size) {
free(buf);
close(fd);
return -1;
}
buf[size++] = '\n';
close(fd);
if (sha1_stat) {
int pos;
if (sha1_stat->valid &&
!match_stat_data_racy(&the_index, &sha1_stat->stat, &st))
; /* no content change, ss->sha1 still good */
else if (check_index &&
(pos = cache_name_pos(fname, strlen(fname))) >= 0 &&
!ce_stage(active_cache[pos]) &&
ce_uptodate(active_cache[pos]) &&
!would_convert_to_git(fname))
hashcpy(sha1_stat->sha1, active_cache[pos]->sha1);
else
hash_sha1_file(buf, size, "blob", sha1_stat->sha1);
fill_stat_data(&sha1_stat->stat, &st);
sha1_stat->valid = 1;
}
}
el->filebuf = buf;
if (skip_utf8_bom(&buf, size))
size -= buf - el->filebuf;
entry = buf;
for (i = 0; i < size; i++) {
if (buf[i] == '\n') {
if (entry != buf + i && entry[0] != '#') {
buf[i - (i && buf[i-1] == '\r')] = 0;
trim_trailing_spaces(entry);
add_exclude(entry, base, baselen, el, lineno);
}
lineno++;
entry = buf + i + 1;
}
}
return 0;
}
int add_excludes_from_file_to_list(const char *fname, const char *base,
int baselen, struct exclude_list *el,
int check_index)
{
return add_excludes(fname, base, baselen, el, check_index, NULL);
}
struct exclude_list *add_exclude_list(struct dir_struct *dir,
int group_type, const char *src)
{
struct exclude_list *el;
struct exclude_list_group *group;
group = &dir->exclude_list_group[group_type];
ALLOC_GROW(group->el, group->nr + 1, group->alloc);
el = &group->el[group->nr++];
memset(el, 0, sizeof(*el));
el->src = src;
return el;
}
/*
* Used to set up core.excludesfile and .git/info/exclude lists.
*/
static void add_excludes_from_file_1(struct dir_struct *dir, const char *fname,
struct sha1_stat *sha1_stat)
{
struct exclude_list *el;
/*
* catch setup_standard_excludes() that's called before
* dir->untracked is assigned. That function behaves
* differently when dir->untracked is non-NULL.
*/
if (!dir->untracked)
dir->unmanaged_exclude_files++;
el = add_exclude_list(dir, EXC_FILE, fname);
if (add_excludes(fname, "", 0, el, 0, sha1_stat) < 0)
die("cannot use %s as an exclude file", fname);
}
void add_excludes_from_file(struct dir_struct *dir, const char *fname)
{
dir->unmanaged_exclude_files++; /* see validate_untracked_cache() */
add_excludes_from_file_1(dir, fname, NULL);
}
int match_basename(const char *basename, int basenamelen,
const char *pattern, int prefix, int patternlen,
int flags)
{
if (prefix == patternlen) {
if (patternlen == basenamelen &&
!strncmp_icase(pattern, basename, basenamelen))
return 1;
} else if (flags & EXC_FLAG_ENDSWITH) {
/* "*literal" matching against "fooliteral" */
if (patternlen - 1 <= basenamelen &&
!strncmp_icase(pattern + 1,
basename + basenamelen - (patternlen - 1),
patternlen - 1))
return 1;
} else {
if (fnmatch_icase_mem(pattern, patternlen,
basename, basenamelen,
0) == 0)
return 1;
}
return 0;
}
int match_pathname(const char *pathname, int pathlen,
const char *base, int baselen,
const char *pattern, int prefix, int patternlen,
int flags)
{
const char *name;
int namelen;
/*
* match with FNM_PATHNAME; the pattern has base implicitly
* in front of it.
*/
if (*pattern == '/') {
pattern++;
patternlen--;
prefix--;
}
/*
* baselen does not count the trailing slash. base[] may or
* may not end with a trailing slash though.
*/
if (pathlen < baselen + 1 ||
(baselen && pathname[baselen] != '/') ||
strncmp_icase(pathname, base, baselen))
return 0;
namelen = baselen ? pathlen - baselen - 1 : pathlen;
name = pathname + pathlen - namelen;
if (prefix) {
/*
* if the non-wildcard part is longer than the
* remaining pathname, surely it cannot match.
*/
if (prefix > namelen)
return 0;
if (strncmp_icase(pattern, name, prefix))
return 0;
pattern += prefix;
patternlen -= prefix;
name += prefix;
namelen -= prefix;
/*
* If the whole pattern did not have a wildcard,
* then our prefix match is all we need; we
* do not need to call fnmatch at all.
*/
if (!patternlen && !namelen)
return 1;
}
return fnmatch_icase_mem(pattern, patternlen,
name, namelen,
WM_PATHNAME) == 0;
}
/*
* Scan the given exclude list in reverse to see whether pathname
* should be ignored. The first match (i.e. the last on the list), if
* any, determines the fate. Returns the exclude_list element which
* matched, or NULL for undecided.
*/
static struct exclude *last_exclude_matching_from_list(const char *pathname,
int pathlen,
const char *basename,
int *dtype,
struct exclude_list *el)
{
int i;
if (!el->nr)
return NULL; /* undefined */
for (i = el->nr - 1; 0 <= i; i--) {
struct exclude *x = el->excludes[i];
const char *exclude = x->pattern;
int prefix = x->nowildcardlen;
if (x->flags & EXC_FLAG_MUSTBEDIR) {
if (*dtype == DT_UNKNOWN)
*dtype = get_dtype(NULL, pathname, pathlen);
if (*dtype != DT_DIR)
continue;
}
if (x->flags & EXC_FLAG_NODIR) {
if (match_basename(basename,
pathlen - (basename - pathname),
exclude, prefix, x->patternlen,
x->flags))
return x;
continue;
}
assert(x->baselen == 0 || x->base[x->baselen - 1] == '/');
if (match_pathname(pathname, pathlen,
x->base, x->baselen ? x->baselen - 1 : 0,
exclude, prefix, x->patternlen, x->flags))
return x;
}
return NULL; /* undecided */
}
/*
* Scan the list and let the last match determine the fate.
* Return 1 for exclude, 0 for include and -1 for undecided.
*/
int is_excluded_from_list(const char *pathname,
int pathlen, const char *basename, int *dtype,
struct exclude_list *el)
{
struct exclude *exclude;
exclude = last_exclude_matching_from_list(pathname, pathlen, basename, dtype, el);
if (exclude)
return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
return -1; /* undecided */
}
static struct exclude *last_exclude_matching_from_lists(struct dir_struct *dir,
const char *pathname, int pathlen, const char *basename,
int *dtype_p)
{
int i, j;
struct exclude_list_group *group;
struct exclude *exclude;
for (i = EXC_CMDL; i <= EXC_FILE; i++) {
group = &dir->exclude_list_group[i];
for (j = group->nr - 1; j >= 0; j--) {
exclude = last_exclude_matching_from_list(
pathname, pathlen, basename, dtype_p,
&group->el[j]);
if (exclude)
return exclude;
}
}
return NULL;
}
/*
* Loads the per-directory exclude list for the substring of base
* which has a char length of baselen.
*/
static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
{
struct exclude_list_group *group;
struct exclude_list *el;
struct exclude_stack *stk = NULL;
struct untracked_cache_dir *untracked;
int current;
group = &dir->exclude_list_group[EXC_DIRS];
/*
* Pop the exclude lists from the EXCL_DIRS exclude_list_group
* which originate from directories not in the prefix of the
* path being checked.
*/
while ((stk = dir->exclude_stack) != NULL) {
if (stk->baselen <= baselen &&
!strncmp(dir->basebuf.buf, base, stk->baselen))
break;
el = &group->el[dir->exclude_stack->exclude_ix];
dir->exclude_stack = stk->prev;
dir->exclude = NULL;
free((char *)el->src); /* see strbuf_detach() below */
clear_exclude_list(el);
free(stk);
group->nr--;
}
/* Skip traversing into sub directories if the parent is excluded */
if (dir->exclude)
return;
/*
* Lazy initialization. All call sites currently just
* memset(dir, 0, sizeof(*dir)) before use. Changing all of
* them seems lots of work for little benefit.
*/
if (!dir->basebuf.buf)
strbuf_init(&dir->basebuf, PATH_MAX);
/* Read from the parent directories and push them down. */
current = stk ? stk->baselen : -1;
strbuf_setlen(&dir->basebuf, current < 0 ? 0 : current);
if (dir->untracked)
untracked = stk ? stk->ucd : dir->untracked->root;
else
untracked = NULL;
while (current < baselen) {
const char *cp;
struct sha1_stat sha1_stat;
stk = xcalloc(1, sizeof(*stk));
if (current < 0) {
cp = base;
current = 0;
} else {
cp = strchr(base + current + 1, '/');
if (!cp)
die("oops in prep_exclude");
cp++;
untracked =
lookup_untracked(dir->untracked, untracked,
base + current,
cp - base - current);
}
stk->prev = dir->exclude_stack;
stk->baselen = cp - base;
stk->exclude_ix = group->nr;
stk->ucd = untracked;
el = add_exclude_list(dir, EXC_DIRS, NULL);
strbuf_add(&dir->basebuf, base + current, stk->baselen - current);
assert(stk->baselen == dir->basebuf.len);
/* Abort if the directory is excluded */
if (stk->baselen) {
int dt = DT_DIR;
dir->basebuf.buf[stk->baselen - 1] = 0;
dir->exclude = last_exclude_matching_from_lists(dir,
dir->basebuf.buf, stk->baselen - 1,
dir->basebuf.buf + current, &dt);
dir->basebuf.buf[stk->baselen - 1] = '/';
if (dir->exclude &&
dir->exclude->flags & EXC_FLAG_NEGATIVE)
dir->exclude = NULL;
if (dir->exclude) {
dir->exclude_stack = stk;
return;
}
}
/* Try to read per-directory file */
hashclr(sha1_stat.sha1);
sha1_stat.valid = 0;
if (dir->exclude_per_dir &&
/*
* If we know that no files have been added in
* this directory (i.e. valid_cached_dir() has
* been executed and set untracked->valid) ..
*/
(!untracked || !untracked->valid ||
/*
* .. and .gitignore does not exist before
* (i.e. null exclude_sha1). Then we can skip
* loading .gitignore, which would result in
* ENOENT anyway.
*/
!is_null_sha1(untracked->exclude_sha1))) {
/*
* dir->basebuf gets reused by the traversal, but we
* need fname to remain unchanged to ensure the src
* member of each struct exclude correctly
* back-references its source file. Other invocations
* of add_exclude_list provide stable strings, so we
* strbuf_detach() and free() here in the caller.
*/
struct strbuf sb = STRBUF_INIT;
strbuf_addbuf(&sb, &dir->basebuf);
strbuf_addstr(&sb, dir->exclude_per_dir);
el->src = strbuf_detach(&sb, NULL);
add_excludes(el->src, el->src, stk->baselen, el, 1,
untracked ? &sha1_stat : NULL);
}
/*
* NEEDSWORK: when untracked cache is enabled, prep_exclude()
* will first be called in valid_cached_dir() then maybe many
* times more in last_exclude_matching(). When the cache is
* used, last_exclude_matching() will not be called and
* reading .gitignore content will be a waste.
*
* So when it's called by valid_cached_dir() and we can get
* .gitignore SHA-1 from the index (i.e. .gitignore is not
* modified on work tree), we could delay reading the
* .gitignore content until we absolutely need it in
* last_exclude_matching(). Be careful about ignore rule
* order, though, if you do that.
*/
if (untracked &&
hashcmp(sha1_stat.sha1, untracked->exclude_sha1)) {
invalidate_gitignore(dir->untracked, untracked);
hashcpy(untracked->exclude_sha1, sha1_stat.sha1);
}
dir->exclude_stack = stk;
current = stk->baselen;
}
strbuf_setlen(&dir->basebuf, baselen);
}
/*
* Loads the exclude lists for the directory containing pathname, then
* scans all exclude lists to determine whether pathname is excluded.
* Returns the exclude_list element which matched, or NULL for
* undecided.
*/
struct exclude *last_exclude_matching(struct dir_struct *dir,
const char *pathname,
int *dtype_p)
{
int pathlen = strlen(pathname);
const char *basename = strrchr(pathname, '/');
basename = (basename) ? basename+1 : pathname;
prep_exclude(dir, pathname, basename-pathname);
if (dir->exclude)
return dir->exclude;
return last_exclude_matching_from_lists(dir, pathname, pathlen,
basename, dtype_p);
}
/*
* Loads the exclude lists for the directory containing pathname, then
* scans all exclude lists to determine whether pathname is excluded.
* Returns 1 if true, otherwise 0.
*/
int is_excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
{
struct exclude *exclude =
last_exclude_matching(dir, pathname, dtype_p);
if (exclude)
return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
return 0;
}
static struct dir_entry *dir_entry_new(const char *pathname, int len)
{
struct dir_entry *ent;
ent = xmalloc(sizeof(*ent) + len + 1);
ent->len = len;
memcpy(ent->name, pathname, len);
ent->name[len] = 0;
return ent;
}
static struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
{
if (cache_file_exists(pathname, len, ignore_case))
return NULL;
ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc);
return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
}
struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
{
if (!cache_name_is_other(pathname, len))
return NULL;
ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc);
return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len);
}
enum exist_status {
index_nonexistent = 0,
index_directory,
index_gitdir
};
/*
* Do not use the alphabetically sorted index to look up
* the directory name; instead, use the case insensitive
* directory hash.
*/
static enum exist_status directory_exists_in_index_icase(const char *dirname, int len)
{
struct cache_entry *ce;
if (cache_dir_exists(dirname, len))
return index_directory;
ce = cache_file_exists(dirname, len, ignore_case);
if (ce && S_ISGITLINK(ce->ce_mode))
return index_gitdir;
return index_nonexistent;
}
/*
* The index sorts alphabetically by entry name, which
* means that a gitlink sorts as '\0' at the end, while
* a directory (which is defined not as an entry, but as
* the files it contains) will sort with the '/' at the
* end.
*/
static enum exist_status directory_exists_in_index(const char *dirname, int len)
{
int pos;
if (ignore_case)
return directory_exists_in_index_icase(dirname, len);
pos = cache_name_pos(dirname, len);
if (pos < 0)
pos = -pos-1;
while (pos < active_nr) {
const struct cache_entry *ce = active_cache[pos++];
unsigned char endchar;
if (strncmp(ce->name, dirname, len))
break;
endchar = ce->name[len];
if (endchar > '/')
break;
if (endchar == '/')
return index_directory;
if (!endchar && S_ISGITLINK(ce->ce_mode))
return index_gitdir;
}
return index_nonexistent;
}
/*
* When we find a directory when traversing the filesystem, we
* have three distinct cases:
*
* - ignore it
* - see it as a directory
* - recurse into it
*
* and which one we choose depends on a combination of existing
* git index contents and the flags passed into the directory
* traversal routine.
*
* Case 1: If we *already* have entries in the index under that
* directory name, we always recurse into the directory to see
* all the files.
*
* Case 2: If we *already* have that directory name as a gitlink,
* we always continue to see it as a gitlink, regardless of whether
* there is an actual git directory there or not (it might not
* be checked out as a subproject!)
*
* Case 3: if we didn't have it in the index previously, we
* have a few sub-cases:
*
* (a) if "show_other_directories" is true, we show it as
* just a directory, unless "hide_empty_directories" is
* also true, in which case we need to check if it contains any
* untracked and / or ignored files.
* (b) if it looks like a git directory, and we don't have
* 'no_gitlinks' set we treat it as a gitlink, and show it
* as a directory.
* (c) otherwise, we recurse into it.
*/
static enum path_treatment treat_directory(struct dir_struct *dir,
struct untracked_cache_dir *untracked,
const char *dirname, int len, int baselen, int exclude,
const struct path_simplify *simplify)
{
/* The "len-1" is to strip the final '/' */
switch (directory_exists_in_index(dirname, len-1)) {
case index_directory:
return path_recurse;
case index_gitdir:
return path_none;
case index_nonexistent:
if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
break;
if (!(dir->flags & DIR_NO_GITLINKS)) {
unsigned char sha1[20];
if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0)
return path_untracked;
}
return path_recurse;
}
/* This is the "show_other_directories" case */
if (!(dir->flags & DIR_HIDE_EMPTY_DIRECTORIES))
return exclude ? path_excluded : path_untracked;
untracked = lookup_untracked(dir->untracked, untracked,
dirname + baselen, len - baselen);
return read_directory_recursive(dir, dirname, len,
untracked, 1, simplify);
}
/*
* This is an inexact early pruning of any recursive directory
* reading - if the path cannot possibly be in the pathspec,
* return true, and we'll skip it early.
*/
static int simplify_away(const char *path, int pathlen, const struct path_simplify *simplify)
{
if (simplify) {
for (;;) {
const char *match = simplify->path;
int len = simplify->len;
if (!match)
break;
if (len > pathlen)
len = pathlen;
if (!memcmp(path, match, len))
return 0;
simplify++;
}
return 1;
}
return 0;
}
/*
* This function tells us whether an excluded path matches a
* list of "interesting" pathspecs. That is, whether a path matched
* by any of the pathspecs could possibly be ignored by excluding
* the specified path. This can happen if:
*
* 1. the path is mentioned explicitly in the pathspec
*
* 2. the path is a directory prefix of some element in the
* pathspec
*/
static int exclude_matches_pathspec(const char *path, int len,
const struct path_simplify *simplify)
{
if (simplify) {
for (; simplify->path; simplify++) {
if (len == simplify->len
&& !memcmp(path, simplify->path, len))
return 1;
if (len < simplify->len
&& simplify->path[len] == '/'
&& !memcmp(path, simplify->path, len))
return 1;
}
}
return 0;
}
static int get_index_dtype(const char *path, int len)
{
int pos;
const struct cache_entry *ce;
ce = cache_file_exists(path, len, 0);
if (ce) {
if (!ce_uptodate(ce))
return DT_UNKNOWN;
if (S_ISGITLINK(ce->ce_mode))
return DT_DIR;
/*
* Nobody actually cares about the
* difference between DT_LNK and DT_REG
*/
return DT_REG;
}
/* Try to look it up as a directory */
pos = cache_name_pos(path, len);
if (pos >= 0)
return DT_UNKNOWN;
pos = -pos-1;
while (pos < active_nr) {
ce = active_cache[pos++];
if (strncmp(ce->name, path, len))
break;
if (ce->name[len] > '/')
break;
if (ce->name[len] < '/')
continue;
if (!ce_uptodate(ce))
break; /* continue? */
return DT_DIR;
}
return DT_UNKNOWN;
}
static int get_dtype(struct dirent *de, const char *path, int len)
{
int dtype = de ? DTYPE(de) : DT_UNKNOWN;
struct stat st;
if (dtype != DT_UNKNOWN)
return dtype;
dtype = get_index_dtype(path, len);
if (dtype != DT_UNKNOWN)
return dtype;
if (lstat(path, &st))
return dtype;
if (S_ISREG(st.st_mode))
return DT_REG;
if (S_ISDIR(st.st_mode))
return DT_DIR;
if (S_ISLNK(st.st_mode))
return DT_LNK;
return dtype;
}
static enum path_treatment treat_one_path(struct dir_struct *dir,
struct untracked_cache_dir *untracked,
struct strbuf *path,
int baselen,
const struct path_simplify *simplify,
int dtype, struct dirent *de)
{
int exclude;
int has_path_in_index = !!cache_file_exists(path->buf, path->len, ignore_case);
if (dtype == DT_UNKNOWN)
dtype = get_dtype(de, path->buf, path->len);
/* Always exclude indexed files */
if (dtype != DT_DIR && has_path_in_index)
return path_none;
/*
* When we are looking at a directory P in the working tree,
* there are three cases:
*
* (1) P exists in the index. Everything inside the directory P in
* the working tree needs to go when P is checked out from the
* index.
*
* (2) P does not exist in the index, but there is P/Q in the index.
* We know P will stay a directory when we check out the contents
* of the index, but we do not know yet if there is a directory
* P/Q in the working tree to be killed, so we need to recurse.
*
* (3) P does not exist in the index, and there is no P/Q in the index
* to require P to be a directory, either. Only in this case, we
* know that everything inside P will not be killed without
* recursing.
*/
if ((dir->flags & DIR_COLLECT_KILLED_ONLY) &&
(dtype == DT_DIR) &&
!has_path_in_index &&
(directory_exists_in_index(path->buf, path->len) == index_nonexistent))
return path_none;
exclude = is_excluded(dir, path->buf, &dtype);
/*
* Excluded? If we don't explicitly want to show
* ignored files, ignore it
*/
if (exclude && !(dir->flags & (DIR_SHOW_IGNORED|DIR_SHOW_IGNORED_TOO)))
return path_excluded;
switch (dtype) {
default:
return path_none;
case DT_DIR:
strbuf_addch(path, '/');
return treat_directory(dir, untracked, path->buf, path->len,
baselen, exclude, simplify);
case DT_REG:
case DT_LNK:
return exclude ? path_excluded : path_untracked;
}
}
static enum path_treatment treat_path_fast(struct dir_struct *dir,
struct untracked_cache_dir *untracked,
struct cached_dir *cdir,
struct strbuf *path,
int baselen,
const struct path_simplify *simplify)
{
strbuf_setlen(path, baselen);
if (!cdir->ucd) {
strbuf_addstr(path, cdir->file);
return path_untracked;
}
strbuf_addstr(path, cdir->ucd->name);
/* treat_one_path() does this before it calls treat_directory() */
if (path->buf[path->len - 1] != '/')
strbuf_addch(path, '/');
if (cdir->ucd->check_only)
/*
* check_only is set as a result of treat_directory() getting
* to its bottom. Verify again the same set of directories
* with check_only set.
*/
return read_directory_recursive(dir, path->buf, path->len,
cdir->ucd, 1, simplify);
/*
* We get path_recurse in the first run when
* directory_exists_in_index() returns index_nonexistent. We
* are sure that new changes in the index does not impact the
* outcome. Return now.
*/
return path_recurse;
}
static enum path_treatment treat_path(struct dir_struct *dir,
struct untracked_cache_dir *untracked,
struct cached_dir *cdir,
struct strbuf *path,
int baselen,
const struct path_simplify *simplify)
{
int dtype;
struct dirent *de = cdir->de;
if (!de)
return treat_path_fast(dir, untracked, cdir, path,
baselen, simplify);
if (is_dot_or_dotdot(de->d_name) || !strcmp(de->d_name, ".git"))
return path_none;
strbuf_setlen(path, baselen);
strbuf_addstr(path, de->d_name);
if (simplify_away(path->buf, path->len, simplify))
return path_none;
dtype = DTYPE(de);
return treat_one_path(dir, untracked, path, baselen, simplify, dtype, de);
}
static void add_untracked(struct untracked_cache_dir *dir, const char *name)
{
if (!dir)
return;
ALLOC_GROW(dir->untracked, dir->untracked_nr + 1,
dir->untracked_alloc);
dir->untracked[dir->untracked_nr++] = xstrdup(name);
}
static int valid_cached_dir(struct dir_struct *dir,
struct untracked_cache_dir *untracked,
struct strbuf *path,
int check_only)
{
struct stat st;
if (!untracked)
return 0;
if (stat(path->len ? path->buf : ".", &st)) {
invalidate_directory(dir->untracked, untracked);
memset(&untracked->stat_data, 0, sizeof(untracked->stat_data));
return 0;
}
if (!untracked->valid ||
match_stat_data_racy(&the_index, &untracked->stat_data, &st)) {
if (untracked->valid)
invalidate_directory(dir->untracked, untracked);
fill_stat_data(&untracked->stat_data, &st);
return 0;
}
if (untracked->check_only != !!check_only) {
invalidate_directory(dir->untracked, untracked);
return 0;
}
/*
* prep_exclude will be called eventually on this directory,
* but it's called much later in last_exclude_matching(). We
* need it now to determine the validity of the cache for this
* path. The next calls will be nearly no-op, the way
* prep_exclude() is designed.
*/
if (path->len && path->buf[path->len - 1] != '/') {
strbuf_addch(path, '/');
prep_exclude(dir, path->buf, path->len);
strbuf_setlen(path, path->len - 1);
} else
prep_exclude(dir, path->buf, path->len);
/* hopefully prep_exclude() haven't invalidated this entry... */
return untracked->valid;
}
static int open_cached_dir(struct cached_dir *cdir,
struct dir_struct *dir,
struct untracked_cache_dir *untracked,
struct strbuf *path,
int check_only)
{
memset(cdir, 0, sizeof(*cdir));
cdir->untracked = untracked;
if (valid_cached_dir(dir, untracked, path, check_only))
return 0;
cdir->fdir = opendir(path->len ? path->buf : ".");
if (dir->untracked)
dir->untracked->dir_opened++;
if (!cdir->fdir)
return -1;
return 0;
}
static int read_cached_dir(struct cached_dir *cdir)
{
if (cdir->fdir) {
cdir->de = readdir(cdir->fdir);
if (!cdir->de)
return -1;
return 0;
}
while (cdir->nr_dirs < cdir->untracked->dirs_nr) {
struct untracked_cache_dir *d = cdir->untracked->dirs[cdir->nr_dirs];
if (!d->recurse) {
cdir->nr_dirs++;
continue;
}
cdir->ucd = d;
cdir->nr_dirs++;
return 0;
}
cdir->ucd = NULL;
if (cdir->nr_files < cdir->untracked->untracked_nr) {
struct untracked_cache_dir *d = cdir->untracked;
cdir->file = d->untracked[cdir->nr_files++];
return 0;
}
return -1;
}
static void close_cached_dir(struct cached_dir *cdir)
{
if (cdir->fdir)
closedir(cdir->fdir);
/*
* We have gone through this directory and found no untracked
* entries. Mark it valid.
*/
if (cdir->untracked) {
cdir->untracked->valid = 1;
cdir->untracked->recurse = 1;
}
}
/*
* Read a directory tree. We currently ignore anything but
* directories, regular files and symlinks. That's because git
* doesn't handle them at all yet. Maybe that will change some
* day.
*
* Also, we ignore the name ".git" (even if it is not a directory).
* That likely will not change.
*
* Returns the most significant path_treatment value encountered in the scan.
*/
static enum path_treatment read_directory_recursive(struct dir_struct *dir,
const char *base, int baselen,
struct untracked_cache_dir *untracked, int check_only,
const struct path_simplify *simplify)
{
struct cached_dir cdir;
enum path_treatment state, subdir_state, dir_state = path_none;
struct strbuf path = STRBUF_INIT;
strbuf_add(&path, base, baselen);
if (open_cached_dir(&cdir, dir, untracked, &path, check_only))
goto out;
if (untracked)
untracked->check_only = !!check_only;
while (!read_cached_dir(&cdir)) {
/* check how the file or directory should be treated */
state = treat_path(dir, untracked, &cdir, &path, baselen, simplify);
if (state > dir_state)
dir_state = state;
/* recurse into subdir if instructed by treat_path */
if (state == path_recurse) {
struct untracked_cache_dir *ud;
ud = lookup_untracked(dir->untracked, untracked,
path.buf + baselen,
path.len - baselen);
subdir_state =
read_directory_recursive(dir, path.buf, path.len,
ud, check_only, simplify);
if (subdir_state > dir_state)
dir_state = subdir_state;
}
if (check_only) {
/* abort early if maximum state has been reached */
if (dir_state == path_untracked) {
if (cdir.fdir)
add_untracked(untracked, path.buf + baselen);
break;
}
/* skip the dir_add_* part */
continue;
}
/* add the path to the appropriate result list */
switch (state) {
case path_excluded:
if (dir->flags & DIR_SHOW_IGNORED)
dir_add_name(dir, path.buf, path.len);
else if ((dir->flags & DIR_SHOW_IGNORED_TOO) ||
((dir->flags & DIR_COLLECT_IGNORED) &&
exclude_matches_pathspec(path.buf, path.len,
simplify)))
dir_add_ignored(dir, path.buf, path.len);
break;
case path_untracked:
if (dir->flags & DIR_SHOW_IGNORED)
break;
dir_add_name(dir, path.buf, path.len);
if (cdir.fdir)
add_untracked(untracked, path.buf + baselen);
break;
default:
break;
}
}
close_cached_dir(&cdir);
out:
strbuf_release(&path);
return dir_state;
}
static int cmp_name(const void *p1, const void *p2)
{
const struct dir_entry *e1 = *(const struct dir_entry **)p1;
const struct dir_entry *e2 = *(const struct dir_entry **)p2;
return name_compare(e1->name, e1->len, e2->name, e2->len);
}
static struct path_simplify *create_simplify(const char **pathspec)
{
int nr, alloc = 0;
struct path_simplify *simplify = NULL;
if (!pathspec)
return NULL;
for (nr = 0 ; ; nr++) {
const char *match;
ALLOC_GROW(simplify, nr + 1, alloc);
match = *pathspec++;
if (!match)
break;
simplify[nr].path = match;
simplify[nr].len = simple_length(match);
}
simplify[nr].path = NULL;
simplify[nr].len = 0;
return simplify;
}
static void free_simplify(struct path_simplify *simplify)
{
free(simplify);
}
static int treat_leading_path(struct dir_struct *dir,
const char *path, int len,
const struct path_simplify *simplify)
{
struct strbuf sb = STRBUF_INIT;
int baselen, rc = 0;
const char *cp;
int old_flags = dir->flags;
while (len && path[len - 1] == '/')
len--;
if (!len)
return 1;
baselen = 0;
dir->flags &= ~DIR_SHOW_OTHER_DIRECTORIES;
while (1) {
cp = path + baselen + !!baselen;
cp = memchr(cp, '/', path + len - cp);
if (!cp)
baselen = len;
else
baselen = cp - path;
strbuf_setlen(&sb, 0);
strbuf_add(&sb, path, baselen);
if (!is_directory(sb.buf))
break;
if (simplify_away(sb.buf, sb.len, simplify))
break;
if (treat_one_path(dir, NULL, &sb, baselen, simplify,
DT_DIR, NULL) == path_none)
break; /* do not recurse into it */
if (len <= baselen) {
rc = 1;
break; /* finished checking */
}
}
strbuf_release(&sb);
dir->flags = old_flags;
return rc;
}
static const char *get_ident_string(void)
{
static struct strbuf sb = STRBUF_INIT;
struct utsname uts;
if (sb.len)
return sb.buf;
if (uname(&uts) < 0)
die_errno(_("failed to get kernel name and information"));
strbuf_addf(&sb, "Location %s, system %s %s %s", get_git_work_tree(),
uts.sysname, uts.release, uts.version);
return sb.buf;
}
static int ident_in_untracked(const struct untracked_cache *uc)
{
const char *end = uc->ident.buf + uc->ident.len;
const char *p = uc->ident.buf;
for (p = uc->ident.buf; p < end; p += strlen(p) + 1)
if (!strcmp(p, get_ident_string()))
return 1;
return 0;
}
void add_untracked_ident(struct untracked_cache *uc)
{
if (ident_in_untracked(uc))
return;
strbuf_addstr(&uc->ident, get_ident_string());
/* this strbuf contains a list of strings, save NUL too */
strbuf_addch(&uc->ident, 0);
}
static struct untracked_cache_dir *validate_untracked_cache(struct dir_struct *dir,
int base_len,
const struct pathspec *pathspec)
{
struct untracked_cache_dir *root;
if (!dir->untracked || getenv("GIT_DISABLE_UNTRACKED_CACHE"))
return NULL;
/*
* We only support $GIT_DIR/info/exclude and core.excludesfile
* as the global ignore rule files. Any other additions
* (e.g. from command line) invalidate the cache. This
* condition also catches running setup_standard_excludes()
* before setting dir->untracked!
*/
if (dir->unmanaged_exclude_files)
return NULL;
/*
* Optimize for the main use case only: whole-tree git
* status. More work involved in treat_leading_path() if we
* use cache on just a subset of the worktree. pathspec
* support could make the matter even worse.
*/
if (base_len || (pathspec && pathspec->nr))
return NULL;
/* Different set of flags may produce different results */
if (dir->flags != dir->untracked->dir_flags ||
/*
* See treat_directory(), case index_nonexistent. Without
* this flag, we may need to also cache .git file content
* for the resolve_gitlink_ref() call, which we don't.
*/
!(dir->flags & DIR_SHOW_OTHER_DIRECTORIES) ||
/* We don't support collecting ignore files */
(dir->flags & (DIR_SHOW_IGNORED | DIR_SHOW_IGNORED_TOO |
DIR_COLLECT_IGNORED)))
return NULL;
/*
* If we use .gitignore in the cache and now you change it to
* .gitexclude, everything will go wrong.
*/
if (dir->exclude_per_dir != dir->untracked->exclude_per_dir &&
strcmp(dir->exclude_per_dir, dir->untracked->exclude_per_dir))
return NULL;
/*
* EXC_CMDL is not considered in the cache. If people set it,
* skip the cache.
*/
if (dir->exclude_list_group[EXC_CMDL].nr)
return NULL;
if (!ident_in_untracked(dir->untracked)) {
warning(_("Untracked cache is disabled on this system."));
return NULL;
}
if (!dir->untracked->root) {
const int len = sizeof(*dir->untracked->root);
dir->untracked->root = xmalloc(len);
memset(dir->untracked->root, 0, len);
}
/* Validate $GIT_DIR/info/exclude and core.excludesfile */
root = dir->untracked->root;
if (hashcmp(dir->ss_info_exclude.sha1,
dir->untracked->ss_info_exclude.sha1)) {
invalidate_gitignore(dir->untracked, root);
dir->untracked->ss_info_exclude = dir->ss_info_exclude;
}
if (hashcmp(dir->ss_excludes_file.sha1,
dir->untracked->ss_excludes_file.sha1)) {
invalidate_gitignore(dir->untracked, root);
dir->untracked->ss_excludes_file = dir->ss_excludes_file;
}
/* Make sure this directory is not dropped out at saving phase */
root->recurse = 1;
return root;
}
int read_directory(struct dir_struct *dir, const char *path, int len, const struct pathspec *pathspec)
{
struct path_simplify *simplify;
struct untracked_cache_dir *untracked;
/*
* Check out create_simplify()
*/
if (pathspec)
GUARD_PATHSPEC(pathspec,
PATHSPEC_FROMTOP |
PATHSPEC_MAXDEPTH |
PATHSPEC_LITERAL |
PATHSPEC_GLOB |
PATHSPEC_ICASE |
PATHSPEC_EXCLUDE);
if (has_symlink_leading_path(path, len))
return dir->nr;
/*
* exclude patterns are treated like positive ones in
* create_simplify. Usually exclude patterns should be a
* subset of positive ones, which has no impacts on
* create_simplify().
*/
simplify = create_simplify(pathspec ? pathspec->_raw : NULL);
untracked = validate_untracked_cache(dir, len, pathspec);
if (!untracked)
/*
* make sure untracked cache code path is disabled,
* e.g. prep_exclude()
*/
dir->untracked = NULL;
if (!len || treat_leading_path(dir, path, len, simplify))
read_directory_recursive(dir, path, len, untracked, 0, simplify);
free_simplify(simplify);
qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
if (dir->untracked) {
static struct trace_key trace_untracked_stats = TRACE_KEY_INIT(UNTRACKED_STATS);
trace_printf_key(&trace_untracked_stats,
"node creation: %u\n"
"gitignore invalidation: %u\n"
"directory invalidation: %u\n"
"opendir: %u\n",
dir->untracked->dir_created,
dir->untracked->gitignore_invalidated,
dir->untracked->dir_invalidated,
dir->untracked->dir_opened);
if (dir->untracked == the_index.untracked &&
(dir->untracked->dir_opened ||
dir->untracked->gitignore_invalidated ||
dir->untracked->dir_invalidated))
the_index.cache_changed |= UNTRACKED_CHANGED;
if (dir->untracked != the_index.untracked) {
free(dir->untracked);
dir->untracked = NULL;
}
}
return dir->nr;
}
int file_exists(const char *f)
{
struct stat sb;
return lstat(f, &sb) == 0;
}
static int cmp_icase(char a, char b)
{
if (a == b)
return 0;
if (ignore_case)
return toupper(a) - toupper(b);
return a - b;
}
/*
* Given two normalized paths (a trailing slash is ok), if subdir is
* outside dir, return -1. Otherwise return the offset in subdir that
* can be used as relative path to dir.
*/
int dir_inside_of(const char *subdir, const char *dir)
{
int offset = 0;
assert(dir && subdir && *dir && *subdir);
while (*dir && *subdir && !cmp_icase(*dir, *subdir)) {
dir++;
subdir++;
offset++;
}
/* hel[p]/me vs hel[l]/yeah */
if (*dir && *subdir)
return -1;
if (!*subdir)
return !*dir ? offset : -1; /* same dir */
/* foo/[b]ar vs foo/[] */
if (is_dir_sep(dir[-1]))
return is_dir_sep(subdir[-1]) ? offset : -1;
/* foo[/]bar vs foo[] */
return is_dir_sep(*subdir) ? offset + 1 : -1;
}
int is_inside_dir(const char *dir)
{
char *cwd;
int rc;
if (!dir)
return 0;
cwd = xgetcwd();
rc = (dir_inside_of(cwd, dir) >= 0);
free(cwd);
return rc;
}
int is_empty_dir(const char *path)
{
DIR *dir = opendir(path);
struct dirent *e;
int ret = 1;
if (!dir)
return 0;
while ((e = readdir(dir)) != NULL)
if (!is_dot_or_dotdot(e->d_name)) {
ret = 0;
break;
}
closedir(dir);
return ret;
}
static int remove_dir_recurse(struct strbuf *path, int flag, int *kept_up)
{
DIR *dir;
struct dirent *e;
int ret = 0, original_len = path->len, len, kept_down = 0;
int only_empty = (flag & REMOVE_DIR_EMPTY_ONLY);
int keep_toplevel = (flag & REMOVE_DIR_KEEP_TOPLEVEL);
unsigned char submodule_head[20];
if ((flag & REMOVE_DIR_KEEP_NESTED_GIT) &&
!resolve_gitlink_ref(path->buf, "HEAD", submodule_head)) {
/* Do not descend and nuke a nested git work tree. */
if (kept_up)
*kept_up = 1;
return 0;
}
flag &= ~REMOVE_DIR_KEEP_TOPLEVEL;
dir = opendir(path->buf);
if (!dir) {
if (errno == ENOENT)
return keep_toplevel ? -1 : 0;
else if (errno == EACCES && !keep_toplevel)
/*
* An empty dir could be removable even if it
* is unreadable:
*/
return rmdir(path->buf);
else
return -1;
}
if (path->buf[original_len - 1] != '/')
strbuf_addch(path, '/');
len = path->len;
while ((e = readdir(dir)) != NULL) {
struct stat st;
if (is_dot_or_dotdot(e->d_name))
continue;
strbuf_setlen(path, len);
strbuf_addstr(path, e->d_name);
if (lstat(path->buf, &st)) {
if (errno == ENOENT)
/*
* file disappeared, which is what we
* wanted anyway
*/
continue;
/* fall thru */
} else if (S_ISDIR(st.st_mode)) {
if (!remove_dir_recurse(path, flag, &kept_down))
continue; /* happy */
} else if (!only_empty &&
(!unlink(path->buf) || errno == ENOENT)) {
continue; /* happy, too */
}
/* path too long, stat fails, or non-directory still exists */
ret = -1;
break;
}
closedir(dir);
strbuf_setlen(path, original_len);
if (!ret && !keep_toplevel && !kept_down)
ret = (!rmdir(path->buf) || errno == ENOENT) ? 0 : -1;
else if (kept_up)
/*
* report the uplevel that it is not an error that we
* did not rmdir() our directory.
*/
*kept_up = !ret;
return ret;
}
int remove_dir_recursively(struct strbuf *path, int flag)
{
return remove_dir_recurse(path, flag, NULL);
}
static GIT_PATH_FUNC(git_path_info_exclude, "info/exclude")
void setup_standard_excludes(struct dir_struct *dir)
{
const char *path;
dir->exclude_per_dir = ".gitignore";
/* core.excludefile defaulting to $XDG_HOME/git/ignore */
if (!excludes_file)
excludes_file = xdg_config_home("ignore");
if (excludes_file && !access_or_warn(excludes_file, R_OK, 0))
add_excludes_from_file_1(dir, excludes_file,
dir->untracked ? &dir->ss_excludes_file : NULL);
/* per repository user preference */
path = git_path_info_exclude();
if (!access_or_warn(path, R_OK, 0))
add_excludes_from_file_1(dir, path,
dir->untracked ? &dir->ss_info_exclude : NULL);
}
int remove_path(const char *name)
{
char *slash;
if (unlink(name) && errno != ENOENT && errno != ENOTDIR)
return -1;
slash = strrchr(name, '/');
if (slash) {
char *dirs = xstrdup(name);
slash = dirs + (slash - name);
do {
*slash = '\0';
} while (rmdir(dirs) == 0 && (slash = strrchr(dirs, '/')));
free(dirs);
}
return 0;
}
/*
* Frees memory within dir which was allocated for exclude lists and
* the exclude_stack. Does not free dir itself.
*/
void clear_directory(struct dir_struct *dir)
{
int i, j;
struct exclude_list_group *group;
struct exclude_list *el;
struct exclude_stack *stk;
for (i = EXC_CMDL; i <= EXC_FILE; i++) {
group = &dir->exclude_list_group[i];
for (j = 0; j < group->nr; j++) {
el = &group->el[j];
if (i == EXC_DIRS)
free((char *)el->src);
clear_exclude_list(el);
}
free(group->el);
}
stk = dir->exclude_stack;
while (stk) {
struct exclude_stack *prev = stk->prev;
free(stk);
stk = prev;
}
strbuf_release(&dir->basebuf);
}
struct ondisk_untracked_cache {
struct stat_data info_exclude_stat;
struct stat_data excludes_file_stat;
uint32_t dir_flags;
unsigned char info_exclude_sha1[20];
unsigned char excludes_file_sha1[20];
char exclude_per_dir[FLEX_ARRAY];
};
#define ouc_size(len) (offsetof(struct ondisk_untracked_cache, exclude_per_dir) + len + 1)
struct write_data {
int index; /* number of written untracked_cache_dir */
struct ewah_bitmap *check_only; /* from untracked_cache_dir */
struct ewah_bitmap *valid; /* from untracked_cache_dir */
struct ewah_bitmap *sha1_valid; /* set if exclude_sha1 is not null */
struct strbuf out;
struct strbuf sb_stat;
struct strbuf sb_sha1;
};
static void stat_data_to_disk(struct stat_data *to, const struct stat_data *from)
{
to->sd_ctime.sec = htonl(from->sd_ctime.sec);
to->sd_ctime.nsec = htonl(from->sd_ctime.nsec);
to->sd_mtime.sec = htonl(from->sd_mtime.sec);
to->sd_mtime.nsec = htonl(from->sd_mtime.nsec);
to->sd_dev = htonl(from->sd_dev);
to->sd_ino = htonl(from->sd_ino);
to->sd_uid = htonl(from->sd_uid);
to->sd_gid = htonl(from->sd_gid);
to->sd_size = htonl(from->sd_size);
}
static void write_one_dir(struct untracked_cache_dir *untracked,
struct write_data *wd)
{
struct stat_data stat_data;
struct strbuf *out = &wd->out;
unsigned char intbuf[16];
unsigned int intlen, value;
int i = wd->index++;
/*
* untracked_nr should be reset whenever valid is clear, but
* for safety..
*/
if (!untracked->valid) {
untracked->untracked_nr = 0;
untracked->check_only = 0;
}
if (untracked->check_only)
ewah_set(wd->check_only, i);
if (untracked->valid) {
ewah_set(wd->valid, i);
stat_data_to_disk(&stat_data, &untracked->stat_data);
strbuf_add(&wd->sb_stat, &stat_data, sizeof(stat_data));
}
if (!is_null_sha1(untracked->exclude_sha1)) {
ewah_set(wd->sha1_valid, i);
strbuf_add(&wd->sb_sha1, untracked->exclude_sha1, 20);
}
intlen = encode_varint(untracked->untracked_nr, intbuf);
strbuf_add(out, intbuf, intlen);
/* skip non-recurse directories */
for (i = 0, value = 0; i < untracked->dirs_nr; i++)
if (untracked->dirs[i]->recurse)
value++;
intlen = encode_varint(value, intbuf);
strbuf_add(out, intbuf, intlen);
strbuf_add(out, untracked->name, strlen(untracked->name) + 1);
for (i = 0; i < untracked->untracked_nr; i++)
strbuf_add(out, untracked->untracked[i],
strlen(untracked->untracked[i]) + 1);
for (i = 0; i < untracked->dirs_nr; i++)
if (untracked->dirs[i]->recurse)
write_one_dir(untracked->dirs[i], wd);
}
void write_untracked_extension(struct strbuf *out, struct untracked_cache *untracked)
{
struct ondisk_untracked_cache *ouc;
struct write_data wd;
unsigned char varbuf[16];
int len = 0, varint_len;
if (untracked->exclude_per_dir)
len = strlen(untracked->exclude_per_dir);
ouc = xmalloc(sizeof(*ouc) + len + 1);
stat_data_to_disk(&ouc->info_exclude_stat, &untracked->ss_info_exclude.stat);
stat_data_to_disk(&ouc->excludes_file_stat, &untracked->ss_excludes_file.stat);
hashcpy(ouc->info_exclude_sha1, untracked->ss_info_exclude.sha1);
hashcpy(ouc->excludes_file_sha1, untracked->ss_excludes_file.sha1);
ouc->dir_flags = htonl(untracked->dir_flags);
memcpy(ouc->exclude_per_dir, untracked->exclude_per_dir, len + 1);
varint_len = encode_varint(untracked->ident.len, varbuf);
strbuf_add(out, varbuf, varint_len);
strbuf_add(out, untracked->ident.buf, untracked->ident.len);
strbuf_add(out, ouc, ouc_size(len));
free(ouc);
ouc = NULL;
if (!untracked->root) {
varint_len = encode_varint(0, varbuf);
strbuf_add(out, varbuf, varint_len);
return;
}
wd.index = 0;
wd.check_only = ewah_new();
wd.valid = ewah_new();
wd.sha1_valid = ewah_new();
strbuf_init(&wd.out, 1024);
strbuf_init(&wd.sb_stat, 1024);
strbuf_init(&wd.sb_sha1, 1024);
write_one_dir(untracked->root, &wd);
varint_len = encode_varint(wd.index, varbuf);
strbuf_add(out, varbuf, varint_len);
strbuf_addbuf(out, &wd.out);
ewah_serialize_strbuf(wd.valid, out);
ewah_serialize_strbuf(wd.check_only, out);
ewah_serialize_strbuf(wd.sha1_valid, out);
strbuf_addbuf(out, &wd.sb_stat);
strbuf_addbuf(out, &wd.sb_sha1);
strbuf_addch(out, '\0'); /* safe guard for string lists */
ewah_free(wd.valid);
ewah_free(wd.check_only);
ewah_free(wd.sha1_valid);
strbuf_release(&wd.out);
strbuf_release(&wd.sb_stat);
strbuf_release(&wd.sb_sha1);
}
static void free_untracked(struct untracked_cache_dir *ucd)
{
int i;
if (!ucd)
return;
for (i = 0; i < ucd->dirs_nr; i++)
free_untracked(ucd->dirs[i]);
for (i = 0; i < ucd->untracked_nr; i++)
free(ucd->untracked[i]);
free(ucd->untracked);
free(ucd->dirs);
free(ucd);
}
void free_untracked_cache(struct untracked_cache *uc)
{
if (uc)
free_untracked(uc->root);
free(uc);
}
struct read_data {
int index;
struct untracked_cache_dir **ucd;
struct ewah_bitmap *check_only;
struct ewah_bitmap *valid;
struct ewah_bitmap *sha1_valid;
const unsigned char *data;
const unsigned char *end;
};
static void stat_data_from_disk(struct stat_data *to, const struct stat_data *from)
{
to->sd_ctime.sec = get_be32(&from->sd_ctime.sec);
to->sd_ctime.nsec = get_be32(&from->sd_ctime.nsec);
to->sd_mtime.sec = get_be32(&from->sd_mtime.sec);
to->sd_mtime.nsec = get_be32(&from->sd_mtime.nsec);
to->sd_dev = get_be32(&from->sd_dev);
to->sd_ino = get_be32(&from->sd_ino);
to->sd_uid = get_be32(&from->sd_uid);
to->sd_gid = get_be32(&from->sd_gid);
to->sd_size = get_be32(&from->sd_size);
}
static int read_one_dir(struct untracked_cache_dir **untracked_,
struct read_data *rd)
{
struct untracked_cache_dir ud, *untracked;
const unsigned char *next, *data = rd->data, *end = rd->end;
unsigned int value;
int i, len;
memset(&ud, 0, sizeof(ud));
next = data;
value = decode_varint(&next);
if (next > end)
return -1;
ud.recurse = 1;
ud.untracked_alloc = value;
ud.untracked_nr = value;
if (ud.untracked_nr)
ud.untracked = xmalloc(sizeof(*ud.untracked) * ud.untracked_nr);
data = next;
next = data;
ud.dirs_alloc = ud.dirs_nr = decode_varint(&next);
if (next > end)
return -1;
ud.dirs = xmalloc(sizeof(*ud.dirs) * ud.dirs_nr);
data = next;
len = strlen((const char *)data);
next = data + len + 1;
if (next > rd->end)
return -1;
*untracked_ = untracked = xmalloc(sizeof(*untracked) + len);
memcpy(untracked, &ud, sizeof(ud));
memcpy(untracked->name, data, len + 1);
data = next;
for (i = 0; i < untracked->untracked_nr; i++) {
len = strlen((const char *)data);
next = data + len + 1;
if (next > rd->end)
return -1;
untracked->untracked[i] = xstrdup((const char*)data);
data = next;
}
rd->ucd[rd->index++] = untracked;
rd->data = data;
for (i = 0; i < untracked->dirs_nr; i++) {
len = read_one_dir(untracked->dirs + i, rd);
if (len < 0)
return -1;
}
return 0;
}
static void set_check_only(size_t pos, void *cb)
{
struct read_data *rd = cb;
struct untracked_cache_dir *ud = rd->ucd[pos];
ud->check_only = 1;
}
static void read_stat(size_t pos, void *cb)
{
struct read_data *rd = cb;
struct untracked_cache_dir *ud = rd->ucd[pos];
if (rd->data + sizeof(struct stat_data) > rd->end) {
rd->data = rd->end + 1;
return;
}
stat_data_from_disk(&ud->stat_data, (struct stat_data *)rd->data);
rd->data += sizeof(struct stat_data);
ud->valid = 1;
}
static void read_sha1(size_t pos, void *cb)
{
struct read_data *rd = cb;
struct untracked_cache_dir *ud = rd->ucd[pos];
if (rd->data + 20 > rd->end) {
rd->data = rd->end + 1;
return;
}
hashcpy(ud->exclude_sha1, rd->data);
rd->data += 20;
}
static void load_sha1_stat(struct sha1_stat *sha1_stat,
const struct stat_data *stat,
const unsigned char *sha1)
{
stat_data_from_disk(&sha1_stat->stat, stat);
hashcpy(sha1_stat->sha1, sha1);
sha1_stat->valid = 1;
}
struct untracked_cache *read_untracked_extension(const void *data, unsigned long sz)
{
const struct ondisk_untracked_cache *ouc;
struct untracked_cache *uc;
struct read_data rd;
const unsigned char *next = data, *end = (const unsigned char *)data + sz;
const char *ident;
int ident_len, len;
if (sz <= 1 || end[-1] != '\0')
return NULL;
end--;
ident_len = decode_varint(&next);
if (next + ident_len > end)
return NULL;
ident = (const char *)next;
next += ident_len;
ouc = (const struct ondisk_untracked_cache *)next;
if (next + ouc_size(0) > end)
return NULL;
uc = xcalloc(1, sizeof(*uc));
strbuf_init(&uc->ident, ident_len);
strbuf_add(&uc->ident, ident, ident_len);
load_sha1_stat(&uc->ss_info_exclude, &ouc->info_exclude_stat,
ouc->info_exclude_sha1);
load_sha1_stat(&uc->ss_excludes_file, &ouc->excludes_file_stat,
ouc->excludes_file_sha1);
uc->dir_flags = get_be32(&ouc->dir_flags);
uc->exclude_per_dir = xstrdup(ouc->exclude_per_dir);
/* NUL after exclude_per_dir is covered by sizeof(*ouc) */
next += ouc_size(strlen(ouc->exclude_per_dir));
if (next >= end)
goto done2;
len = decode_varint(&next);
if (next > end || len == 0)
goto done2;
rd.valid = ewah_new();
rd.check_only = ewah_new();
rd.sha1_valid = ewah_new();
rd.data = next;
rd.end = end;
rd.index = 0;
rd.ucd = xmalloc(sizeof(*rd.ucd) * len);
if (read_one_dir(&uc->root, &rd) || rd.index != len)
goto done;
next = rd.data;
len = ewah_read_mmap(rd.valid, next, end - next);
if (len < 0)
goto done;
next += len;
len = ewah_read_mmap(rd.check_only, next, end - next);
if (len < 0)
goto done;
next += len;
len = ewah_read_mmap(rd.sha1_valid, next, end - next);
if (len < 0)
goto done;
ewah_each_bit(rd.check_only, set_check_only, &rd);
rd.data = next + len;
ewah_each_bit(rd.valid, read_stat, &rd);
ewah_each_bit(rd.sha1_valid, read_sha1, &rd);
next = rd.data;
done:
free(rd.ucd);
ewah_free(rd.valid);
ewah_free(rd.check_only);
ewah_free(rd.sha1_valid);
done2:
if (next != end) {
free_untracked_cache(uc);
uc = NULL;
}
return uc;
}
static void invalidate_one_directory(struct untracked_cache *uc,
struct untracked_cache_dir *ucd)
{
uc->dir_invalidated++;
ucd->valid = 0;
ucd->untracked_nr = 0;
}
/*
* Normally when an entry is added or removed from a directory,
* invalidating that directory is enough. No need to touch its
* ancestors. When a directory is shown as "foo/bar/" in git-status
* however, deleting or adding an entry may have cascading effect.
*
* Say the "foo/bar/file" has become untracked, we need to tell the
* untracked_cache_dir of "foo" that "bar/" is not an untracked
* directory any more (because "bar" is managed by foo as an untracked
* "file").
*
* Similarly, if "foo/bar/file" moves from untracked to tracked and it
* was the last untracked entry in the entire "foo", we should show
* "foo/" instead. Which means we have to invalidate past "bar" up to
* "foo".
*
* This function traverses all directories from root to leaf. If there
* is a chance of one of the above cases happening, we invalidate back
* to root. Otherwise we just invalidate the leaf. There may be a more
* sophisticated way than checking for SHOW_OTHER_DIRECTORIES to
* detect these cases and avoid unnecessary invalidation, for example,
* checking for the untracked entry named "bar/" in "foo", but for now
* stick to something safe and simple.
*/
static int invalidate_one_component(struct untracked_cache *uc,
struct untracked_cache_dir *dir,
const char *path, int len)
{
const char *rest = strchr(path, '/');
if (rest) {
int component_len = rest - path;
struct untracked_cache_dir *d =
lookup_untracked(uc, dir, path, component_len);
int ret =
invalidate_one_component(uc, d, rest + 1,
len - (component_len + 1));
if (ret)
invalidate_one_directory(uc, dir);
return ret;
}
invalidate_one_directory(uc, dir);
return uc->dir_flags & DIR_SHOW_OTHER_DIRECTORIES;
}
void untracked_cache_invalidate_path(struct index_state *istate,
const char *path)
{
if (!istate->untracked || !istate->untracked->root)
return;
invalidate_one_component(istate->untracked, istate->untracked->root,
path, strlen(path));
}
void untracked_cache_remove_from_index(struct index_state *istate,
const char *path)
{
untracked_cache_invalidate_path(istate, path);
}
void untracked_cache_add_to_index(struct index_state *istate,
const char *path)
{
untracked_cache_invalidate_path(istate, path);
}