Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "cache-tree.h"
   3#include "tree.h"
   4#include "blob.h"
   5#include "commit.h"
   6#include "tag.h"
   7#include "tree-walk.h"
   8
   9const char *tree_type = "tree";
  10
  11static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt)
  12{
  13        int len;
  14        unsigned int size;
  15        struct cache_entry *ce;
  16
  17        if (S_ISDIR(mode))
  18                return READ_TREE_RECURSIVE;
  19
  20        len = strlen(pathname);
  21        size = cache_entry_size(baselen + len);
  22        ce = xcalloc(1, size);
  23
  24        ce->ce_mode = create_ce_mode(mode);
  25        ce->ce_flags = create_ce_flags(baselen + len, stage);
  26        memcpy(ce->name, base, baselen);
  27        memcpy(ce->name + baselen, pathname, len+1);
  28        hashcpy(ce->sha1, sha1);
  29        return add_cache_entry(ce, opt);
  30}
  31
  32static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
  33{
  34        return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
  35                                  ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  36}
  37
  38/*
  39 * This is used when the caller knows there is no existing entries at
  40 * the stage that will conflict with the entry being added.
  41 */
  42static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
  43{
  44        return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
  45                                  ADD_CACHE_JUST_APPEND);
  46}
  47
  48static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
  49{
  50        const char *match;
  51        int pathlen;
  52
  53        if (!paths)
  54                return 1;
  55        pathlen = strlen(path);
  56        while ((match = *paths++) != NULL) {
  57                int matchlen = strlen(match);
  58
  59                if (baselen >= matchlen) {
  60                        /* If it doesn't match, move along... */
  61                        if (strncmp(base, match, matchlen))
  62                                continue;
  63                        /* The base is a subdirectory of a path which was specified. */
  64                        return 1;
  65                }
  66
  67                /* Does the base match? */
  68                if (strncmp(base, match, baselen))
  69                        continue;
  70
  71                match += baselen;
  72                matchlen -= baselen;
  73
  74                if (pathlen > matchlen)
  75                        continue;
  76
  77                if (matchlen > pathlen) {
  78                        if (match[pathlen] != '/')
  79                                continue;
  80                        if (!S_ISDIR(mode))
  81                                continue;
  82                }
  83
  84                if (strncmp(path, match, pathlen))
  85                        continue;
  86
  87                return 1;
  88        }
  89        return 0;
  90}
  91
  92int read_tree_recursive(struct tree *tree,
  93                        const char *base, int baselen,
  94                        int stage, const char **match,
  95                        read_tree_fn_t fn, void *context)
  96{
  97        struct tree_desc desc;
  98        struct name_entry entry;
  99
 100        if (parse_tree(tree))
 101                return -1;
 102
 103        init_tree_desc(&desc, tree->buffer, tree->size);
 104
 105        while (tree_entry(&desc, &entry)) {
 106                if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
 107                        continue;
 108
 109                switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage, context)) {
 110                case 0:
 111                        continue;
 112                case READ_TREE_RECURSIVE:
 113                        break;
 114                default:
 115                        return -1;
 116                }
 117                if (S_ISDIR(entry.mode)) {
 118                        int retval;
 119                        char *newbase;
 120                        unsigned int pathlen = tree_entry_len(entry.path, entry.sha1);
 121
 122                        newbase = xmalloc(baselen + 1 + pathlen);
 123                        memcpy(newbase, base, baselen);
 124                        memcpy(newbase + baselen, entry.path, pathlen);
 125                        newbase[baselen + pathlen] = '/';
 126                        retval = read_tree_recursive(lookup_tree(entry.sha1),
 127                                                     newbase,
 128                                                     baselen + pathlen + 1,
 129                                                     stage, match, fn, context);
 130                        free(newbase);
 131                        if (retval)
 132                                return -1;
 133                        continue;
 134                } else if (S_ISGITLINK(entry.mode)) {
 135                        int retval;
 136                        struct strbuf path;
 137                        unsigned int entrylen;
 138                        struct commit *commit;
 139
 140                        entrylen = tree_entry_len(entry.path, entry.sha1);
 141                        strbuf_init(&path, baselen + entrylen + 1);
 142                        strbuf_add(&path, base, baselen);
 143                        strbuf_add(&path, entry.path, entrylen);
 144                        strbuf_addch(&path, '/');
 145
 146                        commit = lookup_commit(entry.sha1);
 147                        if (!commit)
 148                                die("Commit %s in submodule path %s not found",
 149                                    sha1_to_hex(entry.sha1), path.buf);
 150
 151                        if (parse_commit(commit))
 152                                die("Invalid commit %s in submodule path %s",
 153                                    sha1_to_hex(entry.sha1), path.buf);
 154
 155                        retval = read_tree_recursive(commit->tree,
 156                                                     path.buf, path.len,
 157                                                     stage, match, fn, context);
 158                        strbuf_release(&path);
 159                        if (retval)
 160                                return -1;
 161                        continue;
 162                }
 163        }
 164        return 0;
 165}
 166
 167static int cmp_cache_name_compare(const void *a_, const void *b_)
 168{
 169        const struct cache_entry *ce1, *ce2;
 170
 171        ce1 = *((const struct cache_entry **)a_);
 172        ce2 = *((const struct cache_entry **)b_);
 173        return cache_name_compare(ce1->name, ce1->ce_flags,
 174                                  ce2->name, ce2->ce_flags);
 175}
 176
 177int read_tree(struct tree *tree, int stage, const char **match)
 178{
 179        read_tree_fn_t fn = NULL;
 180        int i, err;
 181
 182        /*
 183         * Currently the only existing callers of this function all
 184         * call it with stage=1 and after making sure there is nothing
 185         * at that stage; we could always use read_one_entry_quick().
 186         *
 187         * But when we decide to straighten out git-read-tree not to
 188         * use unpack_trees() in some cases, this will probably start
 189         * to matter.
 190         */
 191
 192        /*
 193         * See if we have cache entry at the stage.  If so,
 194         * do it the original slow way, otherwise, append and then
 195         * sort at the end.
 196         */
 197        for (i = 0; !fn && i < active_nr; i++) {
 198                struct cache_entry *ce = active_cache[i];
 199                if (ce_stage(ce) == stage)
 200                        fn = read_one_entry;
 201        }
 202
 203        if (!fn)
 204                fn = read_one_entry_quick;
 205        err = read_tree_recursive(tree, "", 0, stage, match, fn, NULL);
 206        if (fn == read_one_entry || err)
 207                return err;
 208
 209        /*
 210         * Sort the cache entry -- we need to nuke the cache tree, though.
 211         */
 212        cache_tree_free(&active_cache_tree);
 213        qsort(active_cache, active_nr, sizeof(active_cache[0]),
 214              cmp_cache_name_compare);
 215        return 0;
 216}
 217
 218struct tree *lookup_tree(const unsigned char *sha1)
 219{
 220        struct object *obj = lookup_object(sha1);
 221        if (!obj)
 222                return create_object(sha1, OBJ_TREE, alloc_tree_node());
 223        if (!obj->type)
 224                obj->type = OBJ_TREE;
 225        if (obj->type != OBJ_TREE) {
 226                error("Object %s is a %s, not a tree",
 227                      sha1_to_hex(sha1), typename(obj->type));
 228                return NULL;
 229        }
 230        return (struct tree *) obj;
 231}
 232
 233int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 234{
 235        if (item->object.parsed)
 236                return 0;
 237        item->object.parsed = 1;
 238        item->buffer = buffer;
 239        item->size = size;
 240
 241        return 0;
 242}
 243
 244int parse_tree(struct tree *item)
 245{
 246         enum object_type type;
 247         void *buffer;
 248         unsigned long size;
 249
 250        if (item->object.parsed)
 251                return 0;
 252        buffer = read_sha1_file(item->object.sha1, &type, &size);
 253        if (!buffer)
 254                return error("Could not read %s",
 255                             sha1_to_hex(item->object.sha1));
 256        if (type != OBJ_TREE) {
 257                free(buffer);
 258                return error("Object %s not a tree",
 259                             sha1_to_hex(item->object.sha1));
 260        }
 261        return parse_tree_buffer(item, buffer, size);
 262}
 263
 264struct tree *parse_tree_indirect(const unsigned char *sha1)
 265{
 266        struct object *obj = parse_object(sha1);
 267        do {
 268                if (!obj)
 269                        return NULL;
 270                if (obj->type == OBJ_TREE)
 271                        return (struct tree *) obj;
 272                else if (obj->type == OBJ_COMMIT)
 273                        obj = &(((struct commit *) obj)->tree->object);
 274                else if (obj->type == OBJ_TAG)
 275                        obj = ((struct tag *) obj)->tagged;
 276                else
 277                        return NULL;
 278                if (!obj->parsed)
 279                        parse_object(obj->sha1);
 280        } while (1);
 281}