Merge master to get fixes up to GIT 1.2.3
[git.git] / tree.c
1 #include "cache.h"
2 #include "tree.h"
3 #include "blob.h"
4 #include "commit.h"
5 #include "tag.h"
6 #include <stdlib.h>
7
8 const char *tree_type = "tree";
9
10 static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
11 {
12         int len;
13         unsigned int size;
14         struct cache_entry *ce;
15
16         if (S_ISDIR(mode))
17                 return READ_TREE_RECURSIVE;
18
19         len = strlen(pathname);
20         size = cache_entry_size(baselen + len);
21         ce = xmalloc(size);
22
23         memset(ce, 0, size);
24
25         ce->ce_mode = create_ce_mode(mode);
26         ce->ce_flags = create_ce_flags(baselen + len, stage);
27         memcpy(ce->name, base, baselen);
28         memcpy(ce->name + baselen, pathname, len+1);
29         memcpy(ce->sha1, sha1, 20);
30         return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
31 }
32
33 static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
34 {
35         const char *match;
36         int pathlen;
37
38         if (!paths)
39                 return 1;
40         pathlen = strlen(path);
41         while ((match = *paths++) != NULL) {
42                 int matchlen = strlen(match);
43
44                 if (baselen >= matchlen) {
45                         /* If it doesn't match, move along... */
46                         if (strncmp(base, match, matchlen))
47                                 continue;
48                         /* The base is a subdirectory of a path which was specified. */
49                         return 1;
50                 }
51
52                 /* Does the base match? */
53                 if (strncmp(base, match, baselen))
54                         continue;
55
56                 match += baselen;
57                 matchlen -= baselen;
58
59                 if (pathlen > matchlen)
60                         continue;
61
62                 if (matchlen > pathlen) {
63                         if (match[pathlen] != '/')
64                                 continue;
65                         if (!S_ISDIR(mode))
66                                 continue;
67                 }
68
69                 if (strncmp(path, match, pathlen))
70                         continue;
71
72                 return 1;
73         }
74         return 0;
75 }
76
77 int read_tree_recursive(struct tree *tree,
78                         const char *base, int baselen,
79                         int stage, const char **match,
80                         read_tree_fn_t fn)
81 {
82         struct tree_entry_list *list;
83         if (parse_tree(tree))
84                 return -1;
85         list = tree->entries;
86         while (list) {
87                 struct tree_entry_list *current = list;
88                 list = list->next;
89                 if (!match_tree_entry(base, baselen, current->name,
90                                       current->mode, match))
91                         continue;
92
93                 switch (fn(current->item.any->sha1, base, baselen,
94                            current->name, current->mode, stage)) {
95                 case 0:
96                         continue;
97                 case READ_TREE_RECURSIVE:
98                         break;;
99                 default:
100                         return -1;
101                 }
102                 if (current->directory) {
103                         int retval;
104                         int pathlen = strlen(current->name);
105                         char *newbase;
106
107                         newbase = xmalloc(baselen + 1 + pathlen);
108                         memcpy(newbase, base, baselen);
109                         memcpy(newbase + baselen, current->name, pathlen);
110                         newbase[baselen + pathlen] = '/';
111                         retval = read_tree_recursive(current->item.tree,
112                                                      newbase,
113                                                      baselen + pathlen + 1,
114                                                      stage, match, fn);
115                         free(newbase);
116                         if (retval)
117                                 return -1;
118                         continue;
119                 }
120         }
121         return 0;
122 }
123
124 int read_tree(struct tree *tree, int stage, const char **match)
125 {
126         return read_tree_recursive(tree, "", 0, stage, match, read_one_entry);
127 }
128
129 struct tree *lookup_tree(const unsigned char *sha1)
130 {
131         struct object *obj = lookup_object(sha1);
132         if (!obj) {
133                 struct tree *ret = xmalloc(sizeof(struct tree));
134                 memset(ret, 0, sizeof(struct tree));
135                 created_object(sha1, &ret->object);
136                 ret->object.type = tree_type;
137                 return ret;
138         }
139         if (!obj->type)
140                 obj->type = tree_type;
141         if (obj->type != tree_type) {
142                 error("Object %s is a %s, not a tree", 
143                       sha1_to_hex(sha1), obj->type);
144                 return NULL;
145         }
146         return (struct tree *) obj;
147 }
148
149 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
150 {
151         void *bufptr = buffer;
152         struct tree_entry_list **list_p;
153         int n_refs = 0;
154
155         if (item->object.parsed)
156                 return 0;
157         item->object.parsed = 1;
158         list_p = &item->entries;
159         while (size) {
160                 struct object *obj;
161                 struct tree_entry_list *entry;
162                 int len = 1+strlen(bufptr);
163                 unsigned char *file_sha1 = bufptr + len;
164                 char *path = strchr(bufptr, ' ');
165                 unsigned int mode;
166                 if (size < len + 20 || !path || 
167                     sscanf(bufptr, "%o", &mode) != 1)
168                         return -1;
169
170                 entry = xmalloc(sizeof(struct tree_entry_list));
171                 entry->name = strdup(path + 1);
172                 entry->directory = S_ISDIR(mode) != 0;
173                 entry->executable = (mode & S_IXUSR) != 0;
174                 entry->symlink = S_ISLNK(mode) != 0;
175                 entry->zeropad = *(char *)bufptr == '0';
176                 entry->mode = mode;
177                 entry->next = NULL;
178
179                 bufptr += len + 20;
180                 size -= len + 20;
181
182                 if (entry->directory) {
183                         entry->item.tree = lookup_tree(file_sha1);
184                         obj = &entry->item.tree->object;
185                 } else {
186                         entry->item.blob = lookup_blob(file_sha1);
187                         obj = &entry->item.blob->object;
188                 }
189                 if (obj)
190                         n_refs++;
191                 *list_p = entry;
192                 list_p = &entry->next;
193         }
194
195         if (track_object_refs) {
196                 struct tree_entry_list *entry;
197                 unsigned i = 0;
198                 struct object_refs *refs = alloc_object_refs(n_refs);
199                 for (entry = item->entries; entry; entry = entry->next)
200                         refs->ref[i++] = entry->item.any;
201                 set_object_refs(&item->object, refs);
202         }
203
204         return 0;
205 }
206
207 int parse_tree(struct tree *item)
208 {
209          char type[20];
210          void *buffer;
211          unsigned long size;
212          int ret;
213
214         if (item->object.parsed)
215                 return 0;
216         buffer = read_sha1_file(item->object.sha1, type, &size);
217         if (!buffer)
218                 return error("Could not read %s",
219                              sha1_to_hex(item->object.sha1));
220         if (strcmp(type, tree_type)) {
221                 free(buffer);
222                 return error("Object %s not a tree",
223                              sha1_to_hex(item->object.sha1));
224         }
225         ret = parse_tree_buffer(item, buffer, size);
226         free(buffer);
227         return ret;
228 }
229
230 struct tree *parse_tree_indirect(const unsigned char *sha1)
231 {
232         struct object *obj = parse_object(sha1);
233         do {
234                 if (!obj)
235                         return NULL;
236                 if (obj->type == tree_type)
237                         return (struct tree *) obj;
238                 else if (obj->type == commit_type)
239                         obj = &(((struct commit *) obj)->tree->object);
240                 else if (obj->type == tag_type)
241                         obj = ((struct tag *) obj)->tagged;
242                 else
243                         return NULL;
244                 if (!obj->parsed)
245                         parse_object(obj->sha1);
246         } while (1);
247 }