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diff --git a/tree-walk.c b/tree-walk.c
index 02e2aed7737207225f1b96eed774a1b75dd6d8d9..33f749e1e77484694e7b8f40a65755a7818c4abb 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
#include "cache.h"
#include "tree-walk.h"
+#include "unpack-trees.h"
+#include "dir.h"
#include "tree.h"
static const char *get_mode(const char *str, unsigned int *modep)
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));
@@ -138,67 +133,269 @@ char *make_traverse_path(char *path, const struct traverse_info *info, const str
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 name_compare(const char *a, int a_len,
+ const char *b, int b_len)
+{
+ int len = (a_len < b_len) ? a_len : b_len;
+ int cmp = memcmp(a, b, len);
+ if (cmp)
+ return cmp;
+ return (a_len - b_len);
+}
+
+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->path, a->sha1);
+ 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->path, a->sha1);
+ 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);
+ }
+}
+
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));
+
+ for (i = 0; i < n; i++)
+ tx[i].d = t[i];
for (;;) {
- unsigned long mask = 0;
- unsigned long dirmask = 0;
- int i, last;
+ unsigned long mask, dirmask;
+ const char *first = NULL;
+ int first_len = 0;
+ struct name_entry *e;
+ int len;
+
+ for (i = 0; i < n; i++) {
+ e = entry + i;
+ extended_entry_extract(tx + i, e, NULL, 0);
+ }
- last = -1;
+ /*
+ * 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++) {
- if (!t[i].size)
+ e = entry + i;
+ if (!e->path)
continue;
- entry_extract(t+i, entry+i);
- if (last >= 0) {
- int cmp = entry_compare(entry+i, entry+last);
+ len = tree_entry_len(e->path, e->sha1);
+ 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;
+ }
+ }
- /*
- * 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->path, e->sha1);
+ 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;
}
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)
- break;
- if (ret)
- mask &= ret;
+ if (ret < 0) {
+ error = ret;
+ if (!info->show_all_errors)
+ break;
+ }
+ mask &= ret;
ret = 0;
- for (i = 0; i < n; i++) {
+ for (i = 0; i < n; i++)
if (mask & (1ul << i))
- update_tree_entry(t + 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);
+ return error;
}
static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
@@ -250,6 +447,7 @@ 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;
}
@@ -258,3 +456,186 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
free(tree);
return retval;
}
+
+static int match_entry(const struct name_entry *entry, int pathlen,
+ const char *match, int matchlen,
+ int *never_interesting)
+{
+ int m = -1; /* signals that we haven't called strncmp() */
+
+ if (*never_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 = 0;
+ }
+
+ if (pathlen > matchlen)
+ return 0;
+
+ if (matchlen > pathlen) {
+ if (match[pathlen] != '/')
+ return 0;
+ if (!S_ISDIR(entry->mode))
+ return 0;
+ }
+
+ if (m == -1)
+ /*
+ * we cheated and did not do strncmp(), so we do
+ * that here.
+ */
+ m = strncmp(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)
+ return 1;
+
+ return 0;
+}
+
+static int match_dir_prefix(const char *base, int baselen,
+ const char *match, int matchlen)
+{
+ if (strncmp(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;
+}
+
+/*
+ * 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).
+ *
+ * Return:
+ * - 2 for "yes, and all subsequent entries will be"
+ * - 1 for yes
+ * - zero for no
+ * - negative for "no, and no subsequent entries will be either"
+ */
+int tree_entry_interesting(const struct name_entry *entry,
+ struct strbuf *base, int base_offset,
+ const struct pathspec *ps)
+{
+ int i;
+ int pathlen, baselen = base->len - base_offset;
+ int never_interesting = ps->has_wildcard ? 0 : -1;
+
+ if (!ps->nr) {
+ if (!ps->recursive || ps->max_depth == -1)
+ return 2;
+ return !!within_depth(base->buf + base_offset, baselen,
+ !!S_ISDIR(entry->mode),
+ ps->max_depth);
+ }
+
+ pathlen = tree_entry_len(entry->path, entry->sha1);
+
+ 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;
+
+ if (baselen >= matchlen) {
+ /* If it doesn't match, move along... */
+ if (!match_dir_prefix(base_str, baselen, match, matchlen))
+ goto match_wildcards;
+
+ if (!ps->recursive || ps->max_depth == -1)
+ return 2;
+
+ return !!within_depth(base_str + matchlen + 1,
+ baselen - matchlen - 1,
+ !!S_ISDIR(entry->mode),
+ ps->max_depth);
+ }
+
+ /* Does the base match? */
+ if (!strncmp(base_str, match, baselen)) {
+ if (match_entry(entry, pathlen,
+ match + baselen, matchlen - baselen,
+ &never_interesting))
+ return 1;
+
+ if (ps->items[i].use_wildcard) {
+ if (!fnmatch(match + baselen, entry->path, 0))
+ return 1;
+
+ /*
+ * Match all directories. We'll try to
+ * match files later on.
+ */
+ if (ps->recursive && S_ISDIR(entry->mode))
+ return 1;
+ }
+
+ continue;
+ }
+
+match_wildcards:
+ if (!ps->items[i].use_wildcard)
+ continue;
+
+ /*
+ * Concatenate base and entry->path into one and do
+ * fnmatch() on it.
+ */
+
+ strbuf_add(base, entry->path, pathlen);
+
+ if (!fnmatch(match, base->buf + base_offset, 0)) {
+ strbuf_setlen(base, base_offset + baselen);
+ return 1;
+ }
+ strbuf_setlen(base, base_offset + baselen);
+
+ /*
+ * Match all directories. We'll try to match files
+ * later on.
+ */
+ if (ps->recursive && S_ISDIR(entry->mode))
+ return 1;
+ }
+ return never_interesting; /* No matches */
+}