275721c267
Add a new function, get_tree_entry_follow_symlinks, to tree-walk.[ch]. The function is not yet used. It will be used to implement git cat-file --batch --follow-symlinks. The function locates an object by path, following symlinks in the repository. If the symlinks lead outside the repository, the function reports this to the caller. Signed-off-by: David Turner <dturner@twopensource.com> Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1056 lines
26 KiB
C
1056 lines
26 KiB
C
#include "cache.h"
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#include "tree-walk.h"
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#include "unpack-trees.h"
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#include "dir.h"
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#include "tree.h"
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#include "pathspec.h"
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static const char *get_mode(const char *str, unsigned int *modep)
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{
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unsigned char c;
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unsigned int mode = 0;
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if (*str == ' ')
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return NULL;
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while ((c = *str++) != ' ') {
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if (c < '0' || c > '7')
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return NULL;
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mode = (mode << 3) + (c - '0');
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}
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*modep = mode;
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return str;
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}
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static void decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned long size)
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{
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const char *path;
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unsigned int mode, len;
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if (size < 24 || buf[size - 21])
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die("corrupt tree file");
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path = get_mode(buf, &mode);
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if (!path || !*path)
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die("corrupt tree file");
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len = strlen(path) + 1;
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/* Initialize the descriptor entry */
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desc->entry.path = path;
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desc->entry.mode = canon_mode(mode);
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desc->entry.sha1 = (const unsigned char *)(path + len);
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}
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void init_tree_desc(struct tree_desc *desc, const void *buffer, unsigned long size)
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{
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desc->buffer = buffer;
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desc->size = size;
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if (size)
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decode_tree_entry(desc, buffer, size);
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}
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void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1)
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{
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unsigned long size = 0;
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void *buf = NULL;
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if (sha1) {
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buf = read_object_with_reference(sha1, tree_type, &size, NULL);
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if (!buf)
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die("unable to read tree %s", sha1_to_hex(sha1));
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}
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init_tree_desc(desc, buf, size);
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return buf;
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}
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static void entry_clear(struct name_entry *a)
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{
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memset(a, 0, sizeof(*a));
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}
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static void entry_extract(struct tree_desc *t, struct name_entry *a)
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{
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*a = t->entry;
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}
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void update_tree_entry(struct tree_desc *desc)
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{
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const void *buf = desc->buffer;
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const unsigned char *end = desc->entry.sha1 + 20;
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unsigned long size = desc->size;
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unsigned long len = end - (const unsigned char *)buf;
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if (size < len)
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die("corrupt tree file");
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buf = end;
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size -= len;
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desc->buffer = buf;
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desc->size = size;
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if (size)
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decode_tree_entry(desc, buf, size);
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}
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int tree_entry(struct tree_desc *desc, struct name_entry *entry)
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{
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if (!desc->size)
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return 0;
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*entry = desc->entry;
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update_tree_entry(desc);
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return 1;
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}
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void setup_traverse_info(struct traverse_info *info, const char *base)
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{
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int pathlen = strlen(base);
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static struct traverse_info dummy;
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memset(info, 0, sizeof(*info));
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if (pathlen && base[pathlen-1] == '/')
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pathlen--;
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info->pathlen = pathlen ? pathlen + 1 : 0;
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info->name.path = base;
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info->name.sha1 = (void *)(base + pathlen + 1);
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if (pathlen)
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info->prev = &dummy;
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}
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char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n)
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{
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int len = tree_entry_len(n);
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int pathlen = info->pathlen;
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path[pathlen + len] = 0;
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for (;;) {
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memcpy(path + pathlen, n->path, len);
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if (!pathlen)
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break;
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path[--pathlen] = '/';
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n = &info->name;
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len = tree_entry_len(n);
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info = info->prev;
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pathlen -= len;
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}
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return path;
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}
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struct tree_desc_skip {
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struct tree_desc_skip *prev;
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const void *ptr;
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};
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struct tree_desc_x {
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struct tree_desc d;
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struct tree_desc_skip *skip;
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};
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static int check_entry_match(const char *a, int a_len, const char *b, int b_len)
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{
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/*
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* The caller wants to pick *a* from a tree or nothing.
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* We are looking at *b* in a tree.
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*
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* (0) If a and b are the same name, we are trivially happy.
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*
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* There are three possibilities where *a* could be hiding
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* behind *b*.
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*
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* (1) *a* == "t", *b* == "ab" i.e. *b* sorts earlier than *a* no
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* matter what.
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* (2) *a* == "t", *b* == "t-2" and "t" is a subtree in the tree;
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* (3) *a* == "t-2", *b* == "t" and "t-2" is a blob in the tree.
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*
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* Otherwise we know *a* won't appear in the tree without
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* scanning further.
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*/
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int cmp = name_compare(a, a_len, b, b_len);
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/* Most common case first -- reading sync'd trees */
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if (!cmp)
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return cmp;
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if (0 < cmp) {
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/* a comes after b; it does not matter if it is case (3)
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if (b_len < a_len && !memcmp(a, b, b_len) && a[b_len] < '/')
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return 1;
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*/
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return 1; /* keep looking */
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}
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/* b comes after a; are we looking at case (2)? */
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if (a_len < b_len && !memcmp(a, b, a_len) && b[a_len] < '/')
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return 1; /* keep looking */
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return -1; /* a cannot appear in the tree */
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}
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/*
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* From the extended tree_desc, extract the first name entry, while
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* paying attention to the candidate "first" name. Most importantly,
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* when looking for an entry, if there are entries that sorts earlier
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* in the tree object representation than that name, skip them and
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* process the named entry first. We will remember that we haven't
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* processed the first entry yet, and in the later call skip the
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* entry we processed early when update_extended_entry() is called.
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*
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* E.g. if the underlying tree object has these entries:
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*
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* blob "t-1"
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* blob "t-2"
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* tree "t"
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* blob "t=1"
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*
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* and the "first" asks for "t", remember that we still need to
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* process "t-1" and "t-2" but extract "t". After processing the
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* entry "t" from this call, the caller will let us know by calling
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* update_extended_entry() that we can remember "t" has been processed
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* already.
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*/
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static void extended_entry_extract(struct tree_desc_x *t,
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struct name_entry *a,
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const char *first,
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int first_len)
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{
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const char *path;
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int len;
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struct tree_desc probe;
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struct tree_desc_skip *skip;
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/*
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* Extract the first entry from the tree_desc, but skip the
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* ones that we already returned in earlier rounds.
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*/
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while (1) {
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if (!t->d.size) {
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entry_clear(a);
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break; /* not found */
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}
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entry_extract(&t->d, a);
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for (skip = t->skip; skip; skip = skip->prev)
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if (a->path == skip->ptr)
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break; /* found */
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if (!skip)
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break;
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/* We have processed this entry already. */
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update_tree_entry(&t->d);
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}
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if (!first || !a->path)
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return;
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/*
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* The caller wants "first" from this tree, or nothing.
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*/
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path = a->path;
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len = tree_entry_len(a);
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switch (check_entry_match(first, first_len, path, len)) {
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case -1:
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entry_clear(a);
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case 0:
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return;
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default:
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break;
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}
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/*
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* We need to look-ahead -- we suspect that a subtree whose
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* name is "first" may be hiding behind the current entry "path".
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*/
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probe = t->d;
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while (probe.size) {
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entry_extract(&probe, a);
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path = a->path;
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len = tree_entry_len(a);
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switch (check_entry_match(first, first_len, path, len)) {
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case -1:
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entry_clear(a);
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case 0:
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return;
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default:
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update_tree_entry(&probe);
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break;
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}
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/* keep looking */
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}
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entry_clear(a);
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}
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static void update_extended_entry(struct tree_desc_x *t, struct name_entry *a)
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{
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if (t->d.entry.path == a->path) {
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update_tree_entry(&t->d);
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} else {
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/* we have returned this entry early */
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struct tree_desc_skip *skip = xmalloc(sizeof(*skip));
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skip->ptr = a->path;
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skip->prev = t->skip;
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t->skip = skip;
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}
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}
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static void free_extended_entry(struct tree_desc_x *t)
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{
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struct tree_desc_skip *p, *s;
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for (s = t->skip; s; s = p) {
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p = s->prev;
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free(s);
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}
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}
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static inline int prune_traversal(struct name_entry *e,
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struct traverse_info *info,
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struct strbuf *base,
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int still_interesting)
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{
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if (!info->pathspec || still_interesting == 2)
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return 2;
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if (still_interesting < 0)
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return still_interesting;
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return tree_entry_interesting(e, base, 0, info->pathspec);
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}
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int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
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{
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int error = 0;
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struct name_entry *entry = xmalloc(n*sizeof(*entry));
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int i;
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struct tree_desc_x *tx = xcalloc(n, sizeof(*tx));
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struct strbuf base = STRBUF_INIT;
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int interesting = 1;
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for (i = 0; i < n; i++)
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tx[i].d = t[i];
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if (info->prev) {
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strbuf_grow(&base, info->pathlen);
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make_traverse_path(base.buf, info->prev, &info->name);
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base.buf[info->pathlen-1] = '/';
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strbuf_setlen(&base, info->pathlen);
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}
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for (;;) {
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int trees_used;
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unsigned long mask, dirmask;
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const char *first = NULL;
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int first_len = 0;
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struct name_entry *e = NULL;
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int len;
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for (i = 0; i < n; i++) {
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e = entry + i;
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extended_entry_extract(tx + i, e, NULL, 0);
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}
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/*
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* A tree may have "t-2" at the current location even
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* though it may have "t" that is a subtree behind it,
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* and another tree may return "t". We want to grab
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* all "t" from all trees to match in such a case.
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*/
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for (i = 0; i < n; i++) {
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e = entry + i;
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if (!e->path)
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continue;
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len = tree_entry_len(e);
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if (!first) {
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first = e->path;
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first_len = len;
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continue;
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}
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if (name_compare(e->path, len, first, first_len) < 0) {
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first = e->path;
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first_len = len;
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}
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}
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if (first) {
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for (i = 0; i < n; i++) {
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e = entry + i;
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extended_entry_extract(tx + i, e, first, first_len);
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/* Cull the ones that are not the earliest */
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if (!e->path)
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continue;
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len = tree_entry_len(e);
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if (name_compare(e->path, len, first, first_len))
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entry_clear(e);
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}
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}
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/* Now we have in entry[i] the earliest name from the trees */
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mask = 0;
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dirmask = 0;
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for (i = 0; i < n; i++) {
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if (!entry[i].path)
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continue;
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mask |= 1ul << i;
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if (S_ISDIR(entry[i].mode))
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dirmask |= 1ul << i;
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e = &entry[i];
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}
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if (!mask)
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break;
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interesting = prune_traversal(e, info, &base, interesting);
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if (interesting < 0)
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break;
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if (interesting) {
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trees_used = info->fn(n, mask, dirmask, entry, info);
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if (trees_used < 0) {
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error = trees_used;
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if (!info->show_all_errors)
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break;
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}
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mask &= trees_used;
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}
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for (i = 0; i < n; i++)
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if (mask & (1ul << i))
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update_extended_entry(tx + i, entry + i);
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}
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free(entry);
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for (i = 0; i < n; i++)
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free_extended_entry(tx + i);
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free(tx);
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strbuf_release(&base);
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return error;
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}
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struct dir_state {
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void *tree;
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unsigned long size;
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unsigned char sha1[20];
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};
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static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
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{
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int namelen = strlen(name);
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while (t->size) {
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const char *entry;
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const unsigned char *sha1;
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int entrylen, cmp;
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sha1 = tree_entry_extract(t, &entry, mode);
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entrylen = tree_entry_len(&t->entry);
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update_tree_entry(t);
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if (entrylen > namelen)
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continue;
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cmp = memcmp(name, entry, entrylen);
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if (cmp > 0)
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continue;
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if (cmp < 0)
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break;
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if (entrylen == namelen) {
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hashcpy(result, sha1);
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return 0;
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}
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if (name[entrylen] != '/')
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continue;
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if (!S_ISDIR(*mode))
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break;
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if (++entrylen == namelen) {
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hashcpy(result, sha1);
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return 0;
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}
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return get_tree_entry(sha1, name + entrylen, result, mode);
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}
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return -1;
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}
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int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode)
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{
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int retval;
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void *tree;
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unsigned long size;
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unsigned char root[20];
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tree = read_object_with_reference(tree_sha1, tree_type, &size, root);
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if (!tree)
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return -1;
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if (name[0] == '\0') {
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hashcpy(sha1, root);
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free(tree);
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return 0;
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}
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if (!size) {
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retval = -1;
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} else {
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struct tree_desc t;
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init_tree_desc(&t, tree, size);
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retval = find_tree_entry(&t, name, sha1, mode);
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}
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free(tree);
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return retval;
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}
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/*
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* This is Linux's built-in max for the number of symlinks to follow.
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* That limit, of course, does not affect git, but it's a reasonable
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* choice.
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*/
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#define GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS 40
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/**
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* Find a tree entry by following symlinks in tree_sha (which is
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* assumed to be the root of the repository). In the event that a
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* symlink points outside the repository (e.g. a link to /foo or a
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* root-level link to ../foo), the portion of the link which is
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* outside the repository will be returned in result_path, and *mode
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* will be set to 0. It is assumed that result_path is uninitialized.
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* If there are no symlinks, or the end result of the symlink chain
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* points to an object inside the repository, result will be filled in
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* with the sha1 of the found object, and *mode will hold the mode of
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* the object.
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*
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* See the code for enum follow_symlink_result for a description of
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* the return values.
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*/
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enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_sha1, const char *name, unsigned char *result, struct strbuf *result_path, unsigned *mode)
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{
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int retval = MISSING_OBJECT;
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struct dir_state *parents = NULL;
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size_t parents_alloc = 0;
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ssize_t parents_nr = 0;
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unsigned char current_tree_sha1[20];
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struct strbuf namebuf = STRBUF_INIT;
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struct tree_desc t;
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int follows_remaining = GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS;
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int i;
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init_tree_desc(&t, NULL, 0UL);
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strbuf_init(result_path, 0);
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strbuf_addstr(&namebuf, name);
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hashcpy(current_tree_sha1, tree_sha1);
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while (1) {
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int find_result;
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char *first_slash;
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char *remainder = NULL;
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|
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if (!t.buffer) {
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void *tree;
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unsigned char root[20];
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unsigned long size;
|
|
tree = read_object_with_reference(current_tree_sha1,
|
|
tree_type, &size,
|
|
root);
|
|
if (!tree)
|
|
goto done;
|
|
|
|
ALLOC_GROW(parents, parents_nr + 1, parents_alloc);
|
|
parents[parents_nr].tree = tree;
|
|
parents[parents_nr].size = size;
|
|
hashcpy(parents[parents_nr].sha1, root);
|
|
parents_nr++;
|
|
|
|
if (namebuf.buf[0] == '\0') {
|
|
hashcpy(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') {
|
|
hashcpy(result, parents[parents_nr - 1].sha1);
|
|
retval = FOUND;
|
|
goto done;
|
|
}
|
|
|
|
/* Look up the first (or only) path component in the tree. */
|
|
find_result = find_tree_entry(&t, namebuf.buf,
|
|
current_tree_sha1, mode);
|
|
if (find_result) {
|
|
goto done;
|
|
}
|
|
|
|
if (S_ISDIR(*mode)) {
|
|
if (!remainder) {
|
|
hashcpy(result, current_tree_sha1);
|
|
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) {
|
|
hashcpy(result, current_tree_sha1);
|
|
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 = read_sha1_file(current_tree_sha1, &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;
|
|
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 */
|
|
}
|