Git 2.21.2
[git] / tree.c
1 #include "cache.h"
2 #include "cache-tree.h"
3 #include "tree.h"
4 #include "object-store.h"
5 #include "blob.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "alloc.h"
9 #include "tree-walk.h"
10 #include "repository.h"
11
12 const char *tree_type = "tree";
13
14 static int read_one_entry_opt(struct index_state *istate,
15                               const struct object_id *oid,
16                               const char *base, int baselen,
17                               const char *pathname,
18                               unsigned mode, int stage, int opt)
19 {
20         int len;
21         struct cache_entry *ce;
22
23         if (S_ISDIR(mode))
24                 return READ_TREE_RECURSIVE;
25
26         len = strlen(pathname);
27         ce = make_empty_cache_entry(istate, baselen + len);
28
29         ce->ce_mode = create_ce_mode(mode);
30         ce->ce_flags = create_ce_flags(stage);
31         ce->ce_namelen = baselen + len;
32         memcpy(ce->name, base, baselen);
33         memcpy(ce->name + baselen, pathname, len+1);
34         oidcpy(&ce->oid, oid);
35         return add_index_entry(istate, ce, opt);
36 }
37
38 static int read_one_entry(const struct object_id *oid, struct strbuf *base,
39                           const char *pathname, unsigned mode, int stage,
40                           void *context)
41 {
42         struct index_state *istate = context;
43         return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
44                                   mode, stage,
45                                   ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
46 }
47
48 /*
49  * This is used when the caller knows there is no existing entries at
50  * the stage that will conflict with the entry being added.
51  */
52 static int read_one_entry_quick(const struct object_id *oid, struct strbuf *base,
53                                 const char *pathname, unsigned mode, int stage,
54                                 void *context)
55 {
56         struct index_state *istate = context;
57         return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
58                                   mode, stage,
59                                   ADD_CACHE_JUST_APPEND);
60 }
61
62 static int read_tree_1(struct repository *r,
63                        struct tree *tree, struct strbuf *base,
64                        int stage, const struct pathspec *pathspec,
65                        read_tree_fn_t fn, void *context)
66 {
67         struct tree_desc desc;
68         struct name_entry entry;
69         struct object_id oid;
70         int len, oldlen = base->len;
71         enum interesting retval = entry_not_interesting;
72
73         if (parse_tree(tree))
74                 return -1;
75
76         init_tree_desc(&desc, tree->buffer, tree->size);
77
78         while (tree_entry(&desc, &entry)) {
79                 if (retval != all_entries_interesting) {
80                         retval = tree_entry_interesting(r->index, &entry,
81                                                         base, 0, pathspec);
82                         if (retval == all_entries_not_interesting)
83                                 break;
84                         if (retval == entry_not_interesting)
85                                 continue;
86                 }
87
88                 switch (fn(&entry.oid, base,
89                            entry.path, entry.mode, stage, context)) {
90                 case 0:
91                         continue;
92                 case READ_TREE_RECURSIVE:
93                         break;
94                 default:
95                         return -1;
96                 }
97
98                 if (S_ISDIR(entry.mode))
99                         oidcpy(&oid, &entry.oid);
100                 else if (S_ISGITLINK(entry.mode)) {
101                         struct commit *commit;
102
103                         commit = lookup_commit(r, &entry.oid);
104                         if (!commit)
105                                 die("Commit %s in submodule path %s%s not found",
106                                     oid_to_hex(&entry.oid),
107                                     base->buf, entry.path);
108
109                         if (parse_commit(commit))
110                                 die("Invalid commit %s in submodule path %s%s",
111                                     oid_to_hex(&entry.oid),
112                                     base->buf, entry.path);
113
114                         oidcpy(&oid, get_commit_tree_oid(commit));
115                 }
116                 else
117                         continue;
118
119                 len = tree_entry_len(&entry);
120                 strbuf_add(base, entry.path, len);
121                 strbuf_addch(base, '/');
122                 retval = read_tree_1(r, lookup_tree(r, &oid),
123                                      base, stage, pathspec,
124                                      fn, context);
125                 strbuf_setlen(base, oldlen);
126                 if (retval)
127                         return -1;
128         }
129         return 0;
130 }
131
132 int read_tree_recursive(struct repository *r,
133                         struct tree *tree,
134                         const char *base, int baselen,
135                         int stage, const struct pathspec *pathspec,
136                         read_tree_fn_t fn, void *context)
137 {
138         struct strbuf sb = STRBUF_INIT;
139         int ret;
140
141         strbuf_add(&sb, base, baselen);
142         ret = read_tree_1(r, tree, &sb, stage, pathspec, fn, context);
143         strbuf_release(&sb);
144         return ret;
145 }
146
147 static int cmp_cache_name_compare(const void *a_, const void *b_)
148 {
149         const struct cache_entry *ce1, *ce2;
150
151         ce1 = *((const struct cache_entry **)a_);
152         ce2 = *((const struct cache_entry **)b_);
153         return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
154                                   ce2->name, ce2->ce_namelen, ce_stage(ce2));
155 }
156
157 int read_tree(struct repository *r, struct tree *tree, int stage,
158               struct pathspec *match, struct index_state *istate)
159 {
160         read_tree_fn_t fn = NULL;
161         int i, err;
162
163         /*
164          * Currently the only existing callers of this function all
165          * call it with stage=1 and after making sure there is nothing
166          * at that stage; we could always use read_one_entry_quick().
167          *
168          * But when we decide to straighten out git-read-tree not to
169          * use unpack_trees() in some cases, this will probably start
170          * to matter.
171          */
172
173         /*
174          * See if we have cache entry at the stage.  If so,
175          * do it the original slow way, otherwise, append and then
176          * sort at the end.
177          */
178         for (i = 0; !fn && i < istate->cache_nr; i++) {
179                 const struct cache_entry *ce = istate->cache[i];
180                 if (ce_stage(ce) == stage)
181                         fn = read_one_entry;
182         }
183
184         if (!fn)
185                 fn = read_one_entry_quick;
186         err = read_tree_recursive(r, tree, "", 0, stage, match, fn, istate);
187         if (fn == read_one_entry || err)
188                 return err;
189
190         /*
191          * Sort the cache entry -- we need to nuke the cache tree, though.
192          */
193         cache_tree_free(&istate->cache_tree);
194         QSORT(istate->cache, istate->cache_nr, cmp_cache_name_compare);
195         return 0;
196 }
197
198 struct tree *lookup_tree(struct repository *r, const struct object_id *oid)
199 {
200         struct object *obj = lookup_object(r, oid->hash);
201         if (!obj)
202                 return create_object(r, oid->hash,
203                                      alloc_tree_node(r));
204         return object_as_type(r, obj, OBJ_TREE, 0);
205 }
206
207 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
208 {
209         if (item->object.parsed)
210                 return 0;
211         item->object.parsed = 1;
212         item->buffer = buffer;
213         item->size = size;
214
215         return 0;
216 }
217
218 int parse_tree_gently(struct tree *item, int quiet_on_missing)
219 {
220          enum object_type type;
221          void *buffer;
222          unsigned long size;
223
224         if (item->object.parsed)
225                 return 0;
226         buffer = read_object_file(&item->object.oid, &type, &size);
227         if (!buffer)
228                 return quiet_on_missing ? -1 :
229                         error("Could not read %s",
230                              oid_to_hex(&item->object.oid));
231         if (type != OBJ_TREE) {
232                 free(buffer);
233                 return error("Object %s not a tree",
234                              oid_to_hex(&item->object.oid));
235         }
236         return parse_tree_buffer(item, buffer, size);
237 }
238
239 void free_tree_buffer(struct tree *tree)
240 {
241         FREE_AND_NULL(tree->buffer);
242         tree->size = 0;
243         tree->object.parsed = 0;
244 }
245
246 struct tree *parse_tree_indirect(const struct object_id *oid)
247 {
248         struct object *obj = parse_object(the_repository, oid);
249         do {
250                 if (!obj)
251                         return NULL;
252                 if (obj->type == OBJ_TREE)
253                         return (struct tree *) obj;
254                 else if (obj->type == OBJ_COMMIT)
255                         obj = &(get_commit_tree(((struct commit *)obj))->object);
256                 else if (obj->type == OBJ_TAG)
257                         obj = ((struct tag *) obj)->tagged;
258                 else
259                         return NULL;
260                 if (!obj->parsed)
261                         parse_object(the_repository, &obj->oid);
262         } while (1);
263 }