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-rw-r--r--tree-walk.c699
1 files changed, 644 insertions, 55 deletions
diff --git a/tree-walk.c b/tree-walk.c
index 02e2aed773..5dd9a71804 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -1,6 +1,9 @@
#include "cache.h"
#include "tree-walk.h"
+#include "unpack-trees.h"
+#include "dir.h"
#include "tree.h"
+#include "pathspec.h"
static const char *get_mode(const char *str, unsigned int *modep)
{
@@ -34,7 +37,7 @@ static void decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned
/* Initialize the descriptor entry */
desc->entry.path = path;
- desc->entry.mode = mode;
+ desc->entry.mode = canon_mode(mode);
desc->entry.sha1 = (const unsigned char *)(path + len);
}
@@ -60,13 +63,6 @@ void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1)
return buf;
}
-static int entry_compare(struct name_entry *a, struct name_entry *b)
-{
- return df_name_compare(
- a->path, tree_entry_len(a->path, a->sha1), a->mode,
- b->path, tree_entry_len(b->path, b->sha1), b->mode);
-}
-
static void entry_clear(struct name_entry *a)
{
memset(a, 0, sizeof(*a));
@@ -121,7 +117,7 @@ void setup_traverse_info(struct traverse_info *info, const char *base)
char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n)
{
- int len = tree_entry_len(n->path, n->sha1);
+ int len = tree_entry_len(n);
int pathlen = info->pathlen;
path[pathlen + len] = 0;
@@ -131,74 +127,292 @@ char *make_traverse_path(char *path, const struct traverse_info *info, const str
break;
path[--pathlen] = '/';
n = &info->name;
- len = tree_entry_len(n->path, n->sha1);
+ len = tree_entry_len(n);
info = info->prev;
pathlen -= len;
}
return path;
}
+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 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(e, base, 0, info->pathspec);
+}
+
int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
{
- int ret = 0;
+ int error = 0;
struct name_entry *entry = xmalloc(n*sizeof(*entry));
-
+ int i;
+ struct tree_desc_x *tx = xcalloc(n, sizeof(*tx));
+ struct strbuf base = STRBUF_INIT;
+ int interesting = 1;
+
+ for (i = 0; i < n; i++)
+ tx[i].d = t[i];
+
+ if (info->prev) {
+ strbuf_grow(&base, info->pathlen);
+ make_traverse_path(base.buf, info->prev, &info->name);
+ base.buf[info->pathlen-1] = '/';
+ strbuf_setlen(&base, info->pathlen);
+ }
for (;;) {
- unsigned long mask = 0;
- unsigned long dirmask = 0;
- int i, last;
+ int trees_used;
+ unsigned long mask, dirmask;
+ const char *first = NULL;
+ int first_len = 0;
+ struct name_entry *e = NULL;
+ int len;
- last = -1;
for (i = 0; i < n; i++) {
- if (!t[i].size)
+ 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;
- entry_extract(t+i, entry+i);
- if (last >= 0) {
- int cmp = entry_compare(entry+i, entry+last);
+ }
+ if (name_compare(e->path, len, first, first_len) < 0) {
+ first = e->path;
+ first_len = len;
+ }
+ }
- /*
- * Is the new name bigger than the old one?
- * Ignore it
- */
- if (cmp > 0)
+ 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;
- /*
- * Is the new name smaller than the old one?
- * Ignore all old ones
- */
- if (cmp < 0)
- mask = 0;
+ 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;
- last = i;
+ e = &entry[i];
}
if (!mask)
break;
- dirmask &= mask;
-
- /*
- * Clear all the unused name-entries.
- */
- for (i = 0; i < n; i++) {
- if (mask & (1ul << i))
- continue;
- entry_clear(entry + i);
- }
- ret = info->fn(n, mask, dirmask, entry, info);
- if (ret < 0)
+ interesting = prune_traversal(e, info, &base, interesting);
+ if (interesting < 0)
break;
- if (ret)
- mask &= ret;
- ret = 0;
- for (i = 0; i < n; i++) {
- if (mask & (1ul << i))
- update_tree_entry(t + i);
+ 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);
}
free(entry);
- return ret;
+ for (i = 0; i < n; i++)
+ free_extended_entry(tx + i);
+ free(tx);
+ strbuf_release(&base);
+ return error;
}
static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
@@ -210,8 +424,8 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
int entrylen, cmp;
sha1 = tree_entry_extract(t, &entry, mode);
+ entrylen = tree_entry_len(&t->entry);
update_tree_entry(t);
- entrylen = tree_entry_len(entry, sha1);
if (entrylen > namelen)
continue;
cmp = memcmp(name, entry, entrylen);
@@ -241,7 +455,6 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
int retval;
void *tree;
unsigned long size;
- struct tree_desc t;
unsigned char root[20];
tree = read_object_with_reference(tree_sha1, tree_type, &size, root);
@@ -250,11 +463,387 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
if (name[0] == '\0') {
hashcpy(sha1, root);
+ free(tree);
return 0;
}
- init_tree_desc(&t, tree, size);
- retval = find_tree_entry(&t, name, sha1, mode);
+ if (!size) {
+ retval = -1;
+ } else {
+ struct tree_desc t;
+ init_tree_desc(&t, tree, size);
+ retval = find_tree_entry(&t, name, sha1, mode);
+ }
free(tree);
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;
+ if (!S_ISDIR(entry->mode) && !S_ISGITLINK(entry->mode))
+ 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(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);
+
+ 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)
+ return all_entries_interesting;
+
+ return within_depth(base_str + matchlen + 1,
+ baselen - matchlen - 1,
+ !!S_ISDIR(entry->mode),
+ ps->max_depth) ?
+ entry_interesting : 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))
+ return entry_interesting;
+
+ if (item->nowildcard_len < item->len) {
+ if (!git_fnmatch(item, match + baselen, entry->path,
+ item->nowildcard_len - baselen))
+ return entry_interesting;
+
+ /*
+ * Match all directories. We'll try to
+ * match files later on.
+ */
+ if (ps->recursive && S_ISDIR(entry->mode))
+ return entry_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);
+ return entry_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
+ * http://thread.gmane.org/gmane.comp.version-control.git/163757/focus=163840
+ */
+ if (ps->recursive && S_ISDIR(entry->mode))
+ 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(const struct name_entry *entry,
+ struct strbuf *base, int base_offset,
+ const struct pathspec *ps)
+{
+ enum interesting positive, negative;
+ positive = do_match(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 | 2
+ * 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 | 2
+ * 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(entry, base, base_offset, ps, 1);
+
+ /* #3, #4, #7, #8, #13, #14, #17, #18 */
+ 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 */
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 07:45:10 +0000