git/tree-walk.c
Jeff King ec18b10bf2 tree-walk: add a mechanism for getting non-canonicalized modes
When using init_tree_desc() and tree_entry() to iterate over a tree, we
always canonicalize the modes coming out of the tree. This is a good
thing to prevent bugs or oddities in normal code paths, but it's
counter-productive for tools like fsck that want to see the exact
contents.

We can address this by adding an option to avoid the extra
canonicalization. A few notes on the implementation:

  - I've attached the new option to the tree_desc struct itself. The
    actual code change is in decode_tree_entry(), which is in turn
    called by the public update_tree_entry(), tree_entry(), and
    init_tree_desc() functions, plus their "gently" counterparts.

    By letting it ride along in the struct, we can avoid changing the
    signature of those functions, which are called many times. Plus it's
    conceptually simpler: you really want a particular iteration of a
    tree to be "raw" or not, rather than individual calls.

  - We still have to set the new option somewhere. The struct is
    initialized by init_tree_desc(). I added the new flags field only to
    the "gently" version. That avoids disturbing the much more numerous
    non-gentle callers, and it makes sense that anybody being careful
    about looking at raw modes would also be careful about bogus trees
    (i.e., the caller will be something like fsck in the first place).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-10 14:26:25 -07:00

1287 lines
32 KiB
C

#include "cache.h"
#include "tree-walk.h"
#include "dir.h"
#include "object-store.h"
#include "tree.h"
#include "pathspec.h"
#include "json-writer.h"
static const char *get_mode(const char *str, unsigned int *modep)
{
unsigned char c;
unsigned int mode = 0;
if (*str == ' ')
return NULL;
while ((c = *str++) != ' ') {
if (c < '0' || c > '7')
return NULL;
mode = (mode << 3) + (c - '0');
}
*modep = mode;
return str;
}
static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned long size, struct strbuf *err)
{
const char *path;
unsigned int mode, len;
const unsigned hashsz = the_hash_algo->rawsz;
if (size < hashsz + 3 || buf[size - (hashsz + 1)]) {
strbuf_addstr(err, _("too-short tree object"));
return -1;
}
path = get_mode(buf, &mode);
if (!path) {
strbuf_addstr(err, _("malformed mode in tree entry"));
return -1;
}
if (!*path) {
strbuf_addstr(err, _("empty filename in tree entry"));
return -1;
}
len = strlen(path) + 1;
/* Initialize the descriptor entry */
desc->entry.path = path;
desc->entry.mode = (desc->flags & TREE_DESC_RAW_MODES) ? mode : canon_mode(mode);
desc->entry.pathlen = len - 1;
oidread(&desc->entry.oid, (const unsigned char *)path + len);
return 0;
}
static int init_tree_desc_internal(struct tree_desc *desc, const void *buffer,
unsigned long size, struct strbuf *err,
enum tree_desc_flags flags)
{
desc->buffer = buffer;
desc->size = size;
desc->flags = flags;
if (size)
return decode_tree_entry(desc, buffer, size, err);
return 0;
}
void init_tree_desc(struct tree_desc *desc, const void *buffer, unsigned long size)
{
struct strbuf err = STRBUF_INIT;
if (init_tree_desc_internal(desc, buffer, size, &err, 0))
die("%s", err.buf);
strbuf_release(&err);
}
int init_tree_desc_gently(struct tree_desc *desc, const void *buffer, unsigned long size,
enum tree_desc_flags flags)
{
struct strbuf err = STRBUF_INIT;
int result = init_tree_desc_internal(desc, buffer, size, &err, flags);
if (result)
error("%s", err.buf);
strbuf_release(&err);
return result;
}
void *fill_tree_descriptor(struct repository *r,
struct tree_desc *desc,
const struct object_id *oid)
{
unsigned long size = 0;
void *buf = NULL;
if (oid) {
buf = read_object_with_reference(r, oid, OBJ_TREE, &size, NULL);
if (!buf)
die("unable to read tree %s", oid_to_hex(oid));
}
init_tree_desc(desc, buf, size);
return buf;
}
static void entry_clear(struct name_entry *a)
{
memset(a, 0, sizeof(*a));
}
static void entry_extract(struct tree_desc *t, struct name_entry *a)
{
*a = t->entry;
}
static int update_tree_entry_internal(struct tree_desc *desc, struct strbuf *err)
{
const void *buf = desc->buffer;
const unsigned char *end = (const unsigned char *)desc->entry.path + desc->entry.pathlen + 1 + the_hash_algo->rawsz;
unsigned long size = desc->size;
unsigned long len = end - (const unsigned char *)buf;
if (size < len)
die(_("too-short tree file"));
buf = end;
size -= len;
desc->buffer = buf;
desc->size = size;
if (size)
return decode_tree_entry(desc, buf, size, err);
return 0;
}
void update_tree_entry(struct tree_desc *desc)
{
struct strbuf err = STRBUF_INIT;
if (update_tree_entry_internal(desc, &err))
die("%s", err.buf);
strbuf_release(&err);
}
int update_tree_entry_gently(struct tree_desc *desc)
{
struct strbuf err = STRBUF_INIT;
if (update_tree_entry_internal(desc, &err)) {
error("%s", err.buf);
strbuf_release(&err);
/* Stop processing this tree after error */
desc->size = 0;
return -1;
}
strbuf_release(&err);
return 0;
}
int tree_entry(struct tree_desc *desc, struct name_entry *entry)
{
if (!desc->size)
return 0;
*entry = desc->entry;
update_tree_entry(desc);
return 1;
}
int tree_entry_gently(struct tree_desc *desc, struct name_entry *entry)
{
if (!desc->size)
return 0;
*entry = desc->entry;
if (update_tree_entry_gently(desc))
return 0;
return 1;
}
static int traverse_trees_atexit_registered;
static int traverse_trees_count;
static int traverse_trees_cur_depth;
static int traverse_trees_max_depth;
static void trace2_traverse_trees_statistics_atexit(void)
{
struct json_writer jw = JSON_WRITER_INIT;
jw_object_begin(&jw, 0);
jw_object_intmax(&jw, "traverse_trees_count", traverse_trees_count);
jw_object_intmax(&jw, "traverse_trees_max_depth", traverse_trees_max_depth);
jw_end(&jw);
trace2_data_json("traverse_trees", the_repository, "statistics", &jw);
jw_release(&jw);
}
void setup_traverse_info(struct traverse_info *info, const char *base)
{
size_t pathlen = strlen(base);
static struct traverse_info dummy;
memset(info, 0, sizeof(*info));
if (pathlen && base[pathlen-1] == '/')
pathlen--;
info->pathlen = pathlen ? pathlen + 1 : 0;
info->name = base;
info->namelen = pathlen;
if (pathlen)
info->prev = &dummy;
if (trace2_is_enabled() && !traverse_trees_atexit_registered) {
atexit(trace2_traverse_trees_statistics_atexit);
traverse_trees_atexit_registered = 1;
}
}
char *make_traverse_path(char *path, size_t pathlen,
const struct traverse_info *info,
const char *name, size_t namelen)
{
/* Always points to the end of the name we're about to add */
size_t pos = st_add(info->pathlen, namelen);
if (pos >= pathlen)
BUG("too small buffer passed to make_traverse_path");
path[pos] = 0;
for (;;) {
if (pos < namelen)
BUG("traverse_info pathlen does not match strings");
pos -= namelen;
memcpy(path + pos, name, namelen);
if (!pos)
break;
path[--pos] = '/';
if (!info)
BUG("traverse_info ran out of list items");
name = info->name;
namelen = info->namelen;
info = info->prev;
}
return path;
}
void strbuf_make_traverse_path(struct strbuf *out,
const struct traverse_info *info,
const char *name, size_t namelen)
{
size_t len = traverse_path_len(info, namelen);
strbuf_grow(out, len);
make_traverse_path(out->buf + out->len, out->alloc - out->len,
info, name, namelen);
strbuf_setlen(out, out->len + len);
}
struct tree_desc_skip {
struct tree_desc_skip *prev;
const void *ptr;
};
struct tree_desc_x {
struct tree_desc d;
struct tree_desc_skip *skip;
};
static int check_entry_match(const char *a, int a_len, const char *b, int b_len)
{
/*
* The caller wants to pick *a* from a tree or nothing.
* We are looking at *b* in a tree.
*
* (0) If a and b are the same name, we are trivially happy.
*
* There are three possibilities where *a* could be hiding
* behind *b*.
*
* (1) *a* == "t", *b* == "ab" i.e. *b* sorts earlier than *a* no
* matter what.
* (2) *a* == "t", *b* == "t-2" and "t" is a subtree in the tree;
* (3) *a* == "t-2", *b* == "t" and "t-2" is a blob in the tree.
*
* Otherwise we know *a* won't appear in the tree without
* scanning further.
*/
int cmp = name_compare(a, a_len, b, b_len);
/* Most common case first -- reading sync'd trees */
if (!cmp)
return cmp;
if (0 < cmp) {
/* a comes after b; it does not matter if it is case (3)
if (b_len < a_len && !memcmp(a, b, b_len) && a[b_len] < '/')
return 1;
*/
return 1; /* keep looking */
}
/* b comes after a; are we looking at case (2)? */
if (a_len < b_len && !memcmp(a, b, a_len) && b[a_len] < '/')
return 1; /* keep looking */
return -1; /* a cannot appear in the tree */
}
/*
* From the extended tree_desc, extract the first name entry, while
* paying attention to the candidate "first" name. Most importantly,
* when looking for an entry, if there are entries that sorts earlier
* in the tree object representation than that name, skip them and
* process the named entry first. We will remember that we haven't
* processed the first entry yet, and in the later call skip the
* entry we processed early when update_extended_entry() is called.
*
* E.g. if the underlying tree object has these entries:
*
* blob "t-1"
* blob "t-2"
* tree "t"
* blob "t=1"
*
* and the "first" asks for "t", remember that we still need to
* process "t-1" and "t-2" but extract "t". After processing the
* entry "t" from this call, the caller will let us know by calling
* update_extended_entry() that we can remember "t" has been processed
* already.
*/
static void extended_entry_extract(struct tree_desc_x *t,
struct name_entry *a,
const char *first,
int first_len)
{
const char *path;
int len;
struct tree_desc probe;
struct tree_desc_skip *skip;
/*
* Extract the first entry from the tree_desc, but skip the
* ones that we already returned in earlier rounds.
*/
while (1) {
if (!t->d.size) {
entry_clear(a);
break; /* not found */
}
entry_extract(&t->d, a);
for (skip = t->skip; skip; skip = skip->prev)
if (a->path == skip->ptr)
break; /* found */
if (!skip)
break;
/* We have processed this entry already. */
update_tree_entry(&t->d);
}
if (!first || !a->path)
return;
/*
* The caller wants "first" from this tree, or nothing.
*/
path = a->path;
len = tree_entry_len(a);
switch (check_entry_match(first, first_len, path, len)) {
case -1:
entry_clear(a);
case 0:
return;
default:
break;
}
/*
* We need to look-ahead -- we suspect that a subtree whose
* name is "first" may be hiding behind the current entry "path".
*/
probe = t->d;
while (probe.size) {
entry_extract(&probe, a);
path = a->path;
len = tree_entry_len(a);
switch (check_entry_match(first, first_len, path, len)) {
case -1:
entry_clear(a);
case 0:
return;
default:
update_tree_entry(&probe);
break;
}
/* keep looking */
}
entry_clear(a);
}
static void update_extended_entry(struct tree_desc_x *t, struct name_entry *a)
{
if (t->d.entry.path == a->path) {
update_tree_entry(&t->d);
} else {
/* we have returned this entry early */
struct tree_desc_skip *skip = xmalloc(sizeof(*skip));
skip->ptr = a->path;
skip->prev = t->skip;
t->skip = skip;
}
}
static void free_extended_entry(struct tree_desc_x *t)
{
struct tree_desc_skip *p, *s;
for (s = t->skip; s; s = p) {
p = s->prev;
free(s);
}
}
static inline int prune_traversal(struct index_state *istate,
struct name_entry *e,
struct traverse_info *info,
struct strbuf *base,
int still_interesting)
{
if (!info->pathspec || still_interesting == 2)
return 2;
if (still_interesting < 0)
return still_interesting;
return tree_entry_interesting(istate, e, base,
0, info->pathspec);
}
int traverse_trees(struct index_state *istate,
int n, struct tree_desc *t,
struct traverse_info *info)
{
int error = 0;
struct name_entry entry[MAX_TRAVERSE_TREES];
int i;
struct tree_desc_x tx[ARRAY_SIZE(entry)];
struct strbuf base = STRBUF_INIT;
int interesting = 1;
char *traverse_path;
traverse_trees_count++;
traverse_trees_cur_depth++;
if (traverse_trees_cur_depth > traverse_trees_max_depth)
traverse_trees_max_depth = traverse_trees_cur_depth;
if (n >= ARRAY_SIZE(entry))
BUG("traverse_trees() called with too many trees (%d)", n);
for (i = 0; i < n; i++) {
tx[i].d = t[i];
tx[i].skip = NULL;
}
if (info->prev) {
strbuf_make_traverse_path(&base, info->prev,
info->name, info->namelen);
strbuf_addch(&base, '/');
traverse_path = xstrndup(base.buf, base.len);
} else {
traverse_path = xstrndup(info->name, info->pathlen);
}
info->traverse_path = traverse_path;
for (;;) {
int trees_used;
unsigned long mask, dirmask;
const char *first = NULL;
int first_len = 0;
struct name_entry *e = NULL;
int len;
for (i = 0; i < n; i++) {
e = entry + i;
extended_entry_extract(tx + i, e, NULL, 0);
}
/*
* A tree may have "t-2" at the current location even
* though it may have "t" that is a subtree behind it,
* and another tree may return "t". We want to grab
* all "t" from all trees to match in such a case.
*/
for (i = 0; i < n; i++) {
e = entry + i;
if (!e->path)
continue;
len = tree_entry_len(e);
if (!first) {
first = e->path;
first_len = len;
continue;
}
if (name_compare(e->path, len, first, first_len) < 0) {
first = e->path;
first_len = len;
}
}
if (first) {
for (i = 0; i < n; i++) {
e = entry + i;
extended_entry_extract(tx + i, e, first, first_len);
/* Cull the ones that are not the earliest */
if (!e->path)
continue;
len = tree_entry_len(e);
if (name_compare(e->path, len, first, first_len))
entry_clear(e);
}
}
/* Now we have in entry[i] the earliest name from the trees */
mask = 0;
dirmask = 0;
for (i = 0; i < n; i++) {
if (!entry[i].path)
continue;
mask |= 1ul << i;
if (S_ISDIR(entry[i].mode))
dirmask |= 1ul << i;
e = &entry[i];
}
if (!mask)
break;
interesting = prune_traversal(istate, e, info, &base, interesting);
if (interesting < 0)
break;
if (interesting) {
trees_used = info->fn(n, mask, dirmask, entry, info);
if (trees_used < 0) {
error = trees_used;
if (!info->show_all_errors)
break;
}
mask &= trees_used;
}
for (i = 0; i < n; i++)
if (mask & (1ul << i))
update_extended_entry(tx + i, entry + i);
}
for (i = 0; i < n; i++)
free_extended_entry(tx + i);
free(traverse_path);
info->traverse_path = NULL;
strbuf_release(&base);
traverse_trees_cur_depth--;
return error;
}
struct dir_state {
void *tree;
unsigned long size;
struct object_id oid;
};
static int find_tree_entry(struct repository *r, struct tree_desc *t,
const char *name, struct object_id *result,
unsigned short *mode)
{
int namelen = strlen(name);
while (t->size) {
const char *entry;
struct object_id oid;
int entrylen, cmp;
oidcpy(&oid, tree_entry_extract(t, &entry, mode));
entrylen = tree_entry_len(&t->entry);
update_tree_entry(t);
if (entrylen > namelen)
continue;
cmp = memcmp(name, entry, entrylen);
if (cmp > 0)
continue;
if (cmp < 0)
break;
if (entrylen == namelen) {
oidcpy(result, &oid);
return 0;
}
if (name[entrylen] != '/')
continue;
if (!S_ISDIR(*mode))
break;
if (++entrylen == namelen) {
oidcpy(result, &oid);
return 0;
}
return get_tree_entry(r, &oid, name + entrylen, result, mode);
}
return -1;
}
int get_tree_entry(struct repository *r,
const struct object_id *tree_oid,
const char *name,
struct object_id *oid,
unsigned short *mode)
{
int retval;
void *tree;
unsigned long size;
struct object_id root;
tree = read_object_with_reference(r, tree_oid, OBJ_TREE, &size, &root);
if (!tree)
return -1;
if (name[0] == '\0') {
oidcpy(oid, &root);
free(tree);
return 0;
}
if (!size) {
retval = -1;
} else {
struct tree_desc t;
init_tree_desc(&t, tree, size);
retval = find_tree_entry(r, &t, name, oid, mode);
}
free(tree);
return retval;
}
/*
* This is Linux's built-in max for the number of symlinks to follow.
* That limit, of course, does not affect git, but it's a reasonable
* choice.
*/
#define GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS 40
/**
* Find a tree entry by following symlinks in tree_sha (which is
* assumed to be the root of the repository). In the event that a
* symlink points outside the repository (e.g. a link to /foo or a
* root-level link to ../foo), the portion of the link which is
* outside the repository will be returned in result_path, and *mode
* will be set to 0. It is assumed that result_path is uninitialized.
* If there are no symlinks, or the end result of the symlink chain
* points to an object inside the repository, result will be filled in
* with the sha1 of the found object, and *mode will hold the mode of
* the object.
*
* See the code for enum get_oid_result for a description of
* the return values.
*/
enum get_oid_result get_tree_entry_follow_symlinks(struct repository *r,
struct object_id *tree_oid, const char *name,
struct object_id *result, struct strbuf *result_path,
unsigned short *mode)
{
int retval = MISSING_OBJECT;
struct dir_state *parents = NULL;
size_t parents_alloc = 0;
size_t i, parents_nr = 0;
struct object_id current_tree_oid;
struct strbuf namebuf = STRBUF_INIT;
struct tree_desc t;
int follows_remaining = GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS;
init_tree_desc(&t, NULL, 0UL);
strbuf_addstr(&namebuf, name);
oidcpy(&current_tree_oid, tree_oid);
while (1) {
int find_result;
char *first_slash;
char *remainder = NULL;
if (!t.buffer) {
void *tree;
struct object_id root;
unsigned long size;
tree = read_object_with_reference(r,
&current_tree_oid,
OBJ_TREE, &size,
&root);
if (!tree)
goto done;
ALLOC_GROW(parents, parents_nr + 1, parents_alloc);
parents[parents_nr].tree = tree;
parents[parents_nr].size = size;
oidcpy(&parents[parents_nr].oid, &root);
parents_nr++;
if (namebuf.buf[0] == '\0') {
oidcpy(result, &root);
retval = FOUND;
goto done;
}
if (!size)
goto done;
/* descend */
init_tree_desc(&t, tree, size);
}
/* Handle symlinks to e.g. a//b by removing leading slashes */
while (namebuf.buf[0] == '/') {
strbuf_remove(&namebuf, 0, 1);
}
/* Split namebuf into a first component and a remainder */
if ((first_slash = strchr(namebuf.buf, '/'))) {
*first_slash = 0;
remainder = first_slash + 1;
}
if (!strcmp(namebuf.buf, "..")) {
struct dir_state *parent;
/*
* We could end up with .. in the namebuf if it
* appears in a symlink.
*/
if (parents_nr == 1) {
if (remainder)
*first_slash = '/';
strbuf_add(result_path, namebuf.buf,
namebuf.len);
*mode = 0;
retval = FOUND;
goto done;
}
parent = &parents[parents_nr - 1];
free(parent->tree);
parents_nr--;
parent = &parents[parents_nr - 1];
init_tree_desc(&t, parent->tree, parent->size);
strbuf_remove(&namebuf, 0, remainder ? 3 : 2);
continue;
}
/* We could end up here via a symlink to dir/.. */
if (namebuf.buf[0] == '\0') {
oidcpy(result, &parents[parents_nr - 1].oid);
retval = FOUND;
goto done;
}
/* Look up the first (or only) path component in the tree. */
find_result = find_tree_entry(r, &t, namebuf.buf,
&current_tree_oid, mode);
if (find_result) {
goto done;
}
if (S_ISDIR(*mode)) {
if (!remainder) {
oidcpy(result, &current_tree_oid);
retval = FOUND;
goto done;
}
/* Descend the tree */
t.buffer = NULL;
strbuf_remove(&namebuf, 0,
1 + first_slash - namebuf.buf);
} else if (S_ISREG(*mode)) {
if (!remainder) {
oidcpy(result, &current_tree_oid);
retval = FOUND;
} else {
retval = NOT_DIR;
}
goto done;
} else if (S_ISLNK(*mode)) {
/* Follow a symlink */
unsigned long link_len;
size_t len;
char *contents, *contents_start;
struct dir_state *parent;
enum object_type type;
if (follows_remaining-- == 0) {
/* Too many symlinks followed */
retval = SYMLINK_LOOP;
goto done;
}
/*
* At this point, we have followed at a least
* one symlink, so on error we need to report this.
*/
retval = DANGLING_SYMLINK;
contents = repo_read_object_file(r,
&current_tree_oid, &type,
&link_len);
if (!contents)
goto done;
if (contents[0] == '/') {
strbuf_addstr(result_path, contents);
free(contents);
*mode = 0;
retval = FOUND;
goto done;
}
if (remainder)
len = first_slash - namebuf.buf;
else
len = namebuf.len;
contents_start = contents;
parent = &parents[parents_nr - 1];
init_tree_desc(&t, parent->tree, parent->size);
strbuf_splice(&namebuf, 0, len,
contents_start, link_len);
if (remainder)
namebuf.buf[link_len] = '/';
free(contents);
}
}
done:
for (i = 0; i < parents_nr; i++)
free(parents[i].tree);
free(parents);
strbuf_release(&namebuf);
return retval;
}
static int match_entry(const struct pathspec_item *item,
const struct name_entry *entry, int pathlen,
const char *match, int matchlen,
enum interesting *never_interesting)
{
int m = -1; /* signals that we haven't called strncmp() */
if (item->magic & PATHSPEC_ICASE)
/*
* "Never interesting" trick requires exact
* matching. We could do something clever with inexact
* matching, but it's trickier (and not to forget that
* strcasecmp is locale-dependent, at least in
* glibc). Just disable it for now. It can't be worse
* than the wildcard's codepath of '[Tt][Hi][Is][Ss]'
* pattern.
*/
*never_interesting = entry_not_interesting;
else if (*never_interesting != entry_not_interesting) {
/*
* We have not seen any match that sorts later
* than the current path.
*/
/*
* Does match sort strictly earlier than path
* with their common parts?
*/
m = strncmp(match, entry->path,
(matchlen < pathlen) ? matchlen : pathlen);
if (m < 0)
return 0;
/*
* If we come here even once, that means there is at
* least one pathspec that would sort equal to or
* later than the path we are currently looking at.
* In other words, if we have never reached this point
* after iterating all pathspecs, it means all
* pathspecs are either outside of base, or inside the
* base but sorts strictly earlier than the current
* one. In either case, they will never match the
* subsequent entries. In such a case, we initialized
* the variable to -1 and that is what will be
* returned, allowing the caller to terminate early.
*/
*never_interesting = entry_not_interesting;
}
if (pathlen > matchlen)
return 0;
if (matchlen > pathlen) {
if (match[pathlen] != '/')
return 0;
/*
* Reject non-directories as partial pathnames, except
* when match is a submodule with a trailing slash and
* nothing else (to handle 'submod/' and 'submod'
* uniformly).
*/
if (!S_ISDIR(entry->mode) &&
(!S_ISGITLINK(entry->mode) || matchlen > pathlen + 1))
return 0;
}
if (m == -1)
/*
* we cheated and did not do strncmp(), so we do
* that here.
*/
m = ps_strncmp(item, match, entry->path, pathlen);
/*
* If common part matched earlier then it is a hit,
* because we rejected the case where path is not a
* leading directory and is shorter than match.
*/
if (!m)
/*
* match_entry does not check if the prefix part is
* matched case-sensitively. If the entry is a
* directory and part of prefix, it'll be rematched
* eventually by basecmp with special treatment for
* the prefix.
*/
return 1;
return 0;
}
/* :(icase)-aware string compare */
static int basecmp(const struct pathspec_item *item,
const char *base, const char *match, int len)
{
if (item->magic & PATHSPEC_ICASE) {
int ret, n = len > item->prefix ? item->prefix : len;
ret = strncmp(base, match, n);
if (ret)
return ret;
base += n;
match += n;
len -= n;
}
return ps_strncmp(item, base, match, len);
}
static int match_dir_prefix(const struct pathspec_item *item,
const char *base,
const char *match, int matchlen)
{
if (basecmp(item, base, match, matchlen))
return 0;
/*
* If the base is a subdirectory of a path which
* was specified, all of them are interesting.
*/
if (!matchlen ||
base[matchlen] == '/' ||
match[matchlen - 1] == '/')
return 1;
/* Just a random prefix match */
return 0;
}
/*
* Perform matching on the leading non-wildcard part of
* pathspec. item->nowildcard_len must be greater than zero. Return
* non-zero if base is matched.
*/
static int match_wildcard_base(const struct pathspec_item *item,
const char *base, int baselen,
int *matched)
{
const char *match = item->match;
/* the wildcard part is not considered in this function */
int matchlen = item->nowildcard_len;
if (baselen) {
int dirlen;
/*
* Return early if base is longer than the
* non-wildcard part but it does not match.
*/
if (baselen >= matchlen) {
*matched = matchlen;
return !basecmp(item, base, match, matchlen);
}
dirlen = matchlen;
while (dirlen && match[dirlen - 1] != '/')
dirlen--;
/*
* Return early if base is shorter than the
* non-wildcard part but it does not match. Note that
* base ends with '/' so we are sure it really matches
* directory
*/
if (basecmp(item, base, match, baselen))
return 0;
*matched = baselen;
} else
*matched = 0;
/*
* we could have checked entry against the non-wildcard part
* that is not in base and does similar never_interesting
* optimization as in match_entry. For now just be happy with
* base comparison.
*/
return entry_interesting;
}
/*
* Is a tree entry interesting given the pathspec we have?
*
* Pre-condition: either baselen == base_offset (i.e. empty path)
* or base[baselen-1] == '/' (i.e. with trailing slash).
*/
static enum interesting do_match(struct index_state *istate,
const struct name_entry *entry,
struct strbuf *base, int base_offset,
const struct pathspec *ps,
int exclude)
{
int i;
int pathlen, baselen = base->len - base_offset;
enum interesting never_interesting = ps->has_wildcard ?
entry_not_interesting : all_entries_not_interesting;
GUARD_PATHSPEC(ps,
PATHSPEC_FROMTOP |
PATHSPEC_MAXDEPTH |
PATHSPEC_LITERAL |
PATHSPEC_GLOB |
PATHSPEC_ICASE |
PATHSPEC_EXCLUDE |
PATHSPEC_ATTR);
if (!ps->nr) {
if (!ps->recursive ||
!(ps->magic & PATHSPEC_MAXDEPTH) ||
ps->max_depth == -1)
return all_entries_interesting;
return within_depth(base->buf + base_offset, baselen,
!!S_ISDIR(entry->mode),
ps->max_depth) ?
entry_interesting : entry_not_interesting;
}
pathlen = tree_entry_len(entry);
for (i = ps->nr - 1; i >= 0; i--) {
const struct pathspec_item *item = ps->items+i;
const char *match = item->match;
const char *base_str = base->buf + base_offset;
int matchlen = item->len, matched = 0;
if ((!exclude && item->magic & PATHSPEC_EXCLUDE) ||
( exclude && !(item->magic & PATHSPEC_EXCLUDE)))
continue;
if (baselen >= matchlen) {
/* If it doesn't match, move along... */
if (!match_dir_prefix(item, base_str, match, matchlen))
goto match_wildcards;
if (!ps->recursive ||
!(ps->magic & PATHSPEC_MAXDEPTH) ||
ps->max_depth == -1) {
if (!item->attr_match_nr)
return all_entries_interesting;
else
goto interesting;
}
if (within_depth(base_str + matchlen + 1,
baselen - matchlen - 1,
!!S_ISDIR(entry->mode),
ps->max_depth))
goto interesting;
else
return entry_not_interesting;
}
/* Either there must be no base, or the base must match. */
if (baselen == 0 || !basecmp(item, base_str, match, baselen)) {
if (match_entry(item, entry, pathlen,
match + baselen, matchlen - baselen,
&never_interesting))
goto interesting;
if (item->nowildcard_len < item->len) {
if (!git_fnmatch(item, match + baselen, entry->path,
item->nowildcard_len - baselen))
goto interesting;
/*
* Match all directories. We'll try to
* match files later on.
*/
if (ps->recursive && S_ISDIR(entry->mode))
return entry_interesting;
/*
* When matching against submodules with
* wildcard characters, ensure that the entry
* at least matches up to the first wild
* character. More accurate matching can then
* be performed in the submodule itself.
*/
if (ps->recurse_submodules &&
S_ISGITLINK(entry->mode) &&
!ps_strncmp(item, match + baselen,
entry->path,
item->nowildcard_len - baselen))
goto interesting;
}
continue;
}
match_wildcards:
if (item->nowildcard_len == item->len)
continue;
if (item->nowildcard_len &&
!match_wildcard_base(item, base_str, baselen, &matched))
continue;
/*
* Concatenate base and entry->path into one and do
* fnmatch() on it.
*
* While we could avoid concatenation in certain cases
* [1], which saves a memcpy and potentially a
* realloc, it turns out not worth it. Measurement on
* linux-2.6 does not show any clear improvements,
* partly because of the nowildcard_len optimization
* in git_fnmatch(). Avoid micro-optimizations here.
*
* [1] if match_wildcard_base() says the base
* directory is already matched, we only need to match
* the rest, which is shorter so _in theory_ faster.
*/
strbuf_add(base, entry->path, pathlen);
if (!git_fnmatch(item, match, base->buf + base_offset,
item->nowildcard_len)) {
strbuf_setlen(base, base_offset + baselen);
goto interesting;
}
/*
* When matching against submodules with
* wildcard characters, ensure that the entry
* at least matches up to the first wild
* character. More accurate matching can then
* be performed in the submodule itself.
*/
if (ps->recurse_submodules && S_ISGITLINK(entry->mode) &&
!ps_strncmp(item, match, base->buf + base_offset,
item->nowildcard_len)) {
strbuf_setlen(base, base_offset + baselen);
goto interesting;
}
strbuf_setlen(base, base_offset + baselen);
/*
* Match all directories. We'll try to match files
* later on.
* max_depth is ignored but we may consider support it
* in future, see
* https://lore.kernel.org/git/7vmxo5l2g4.fsf@alter.siamese.dyndns.org/
*/
if (ps->recursive && S_ISDIR(entry->mode))
return entry_interesting;
continue;
interesting:
if (item->attr_match_nr) {
int ret;
/*
* Must not return all_entries_not_interesting
* prematurely. We do not know if all entries do not
* match some attributes with current attr API.
*/
never_interesting = entry_not_interesting;
/*
* Consider all directories interesting (because some
* of those files inside may match some attributes
* even though the parent dir does not)
*
* FIXME: attributes _can_ match directories and we
* can probably return all_entries_interesting or
* all_entries_not_interesting here if matched.
*/
if (S_ISDIR(entry->mode))
return entry_interesting;
strbuf_add(base, entry->path, pathlen);
ret = match_pathspec_attrs(istate, base->buf + base_offset,
base->len - base_offset, item);
strbuf_setlen(base, base_offset + baselen);
if (!ret)
continue;
}
return entry_interesting;
}
return never_interesting; /* No matches */
}
/*
* Is a tree entry interesting given the pathspec we have?
*
* Pre-condition: either baselen == base_offset (i.e. empty path)
* or base[baselen-1] == '/' (i.e. with trailing slash).
*/
enum interesting tree_entry_interesting(struct index_state *istate,
const struct name_entry *entry,
struct strbuf *base, int base_offset,
const struct pathspec *ps)
{
enum interesting positive, negative;
positive = do_match(istate, entry, base, base_offset, ps, 0);
/*
* case | entry | positive | negative | result
* -----+-------+----------+----------+-------
* 1 | file | -1 | -1..2 | -1
* 2 | file | 0 | -1..2 | 0
* 3 | file | 1 | -1 | 1
* 4 | file | 1 | 0 | 1
* 5 | file | 1 | 1 | 0
* 6 | file | 1 | 2 | 0
* 7 | file | 2 | -1 | 2
* 8 | file | 2 | 0 | 1
* 9 | file | 2 | 1 | 0
* 10 | file | 2 | 2 | -1
* -----+-------+----------+----------+-------
* 11 | dir | -1 | -1..2 | -1
* 12 | dir | 0 | -1..2 | 0
* 13 | dir | 1 | -1 | 1
* 14 | dir | 1 | 0 | 1
* 15 | dir | 1 | 1 | 1 (*)
* 16 | dir | 1 | 2 | 0
* 17 | dir | 2 | -1 | 2
* 18 | dir | 2 | 0 | 1
* 19 | dir | 2 | 1 | 1 (*)
* 20 | dir | 2 | 2 | -1
*
* (*) An exclude pattern interested in a directory does not
* necessarily mean it will exclude all of the directory. In
* wildcard case, it can't decide until looking at individual
* files inside. So don't write such directories off yet.
*/
if (!(ps->magic & PATHSPEC_EXCLUDE) ||
positive <= entry_not_interesting) /* #1, #2, #11, #12 */
return positive;
negative = do_match(istate, entry, base, base_offset, ps, 1);
/* #8, #18 */
if (positive == all_entries_interesting &&
negative == entry_not_interesting)
return entry_interesting;
/* #3, #4, #7, #13, #14, #17 */
if (negative <= entry_not_interesting)
return positive;
/* #15, #19 */
if (S_ISDIR(entry->mode) &&
positive >= entry_interesting &&
negative == entry_interesting)
return entry_interesting;
if ((positive == entry_interesting &&
negative >= entry_interesting) || /* #5, #6, #16 */
(positive == all_entries_interesting &&
negative == entry_interesting)) /* #9 */
return entry_not_interesting;
return all_entries_not_interesting; /* #10, #20 */
}