Fix users of prefix_path() to free() only when necessary
[git/dscho.git] / fetch.c
blob73bde07aeaeea67e44aef7aec1b79d5806e80a1b
1 #include "fetch.h"
3 #include "cache.h"
4 #include "commit.h"
5 #include "tree.h"
6 #include "tag.h"
7 #include "blob.h"
8 #include "refs.h"
10 const char *write_ref = NULL;
12 const unsigned char *current_ref = NULL;
14 int get_tree = 0;
15 int get_history = 0;
16 int get_all = 0;
17 int get_verbosely = 0;
18 int get_recover = 0;
19 static unsigned char current_commit_sha1[20];
21 void pull_say(const char *fmt, const char *hex)
23 if (get_verbosely)
24 fprintf(stderr, fmt, hex);
27 static void report_missing(const char *what, const unsigned char *missing)
29 char missing_hex[41];
31 strcpy(missing_hex, sha1_to_hex(missing));;
32 fprintf(stderr,
33 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
34 what, missing_hex, sha1_to_hex(current_commit_sha1));
37 static int process(struct object *obj);
39 static int process_tree(struct tree *tree)
41 struct tree_entry_list *entry;
43 if (parse_tree(tree))
44 return -1;
46 entry = tree->entries;
47 tree->entries = NULL;
48 while (entry) {
49 struct tree_entry_list *next = entry->next;
50 if (process(entry->item.any))
51 return -1;
52 free(entry->name);
53 free(entry);
54 entry = next;
56 return 0;
59 #define COMPLETE (1U << 0)
60 #define SEEN (1U << 1)
61 #define TO_SCAN (1U << 2)
63 static struct commit_list *complete = NULL;
65 static int process_commit(struct commit *commit)
67 if (parse_commit(commit))
68 return -1;
70 while (complete && complete->item->date >= commit->date) {
71 pop_most_recent_commit(&complete, COMPLETE);
74 if (commit->object.flags & COMPLETE)
75 return 0;
77 memcpy(current_commit_sha1, commit->object.sha1, 20);
79 pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
81 if (get_tree) {
82 if (process(&commit->tree->object))
83 return -1;
84 if (!get_all)
85 get_tree = 0;
87 if (get_history) {
88 struct commit_list *parents = commit->parents;
89 for (; parents; parents = parents->next) {
90 if (process(&parents->item->object))
91 return -1;
94 return 0;
97 static int process_tag(struct tag *tag)
99 if (parse_tag(tag))
100 return -1;
101 return process(tag->tagged);
104 static struct object_list *process_queue = NULL;
105 static struct object_list **process_queue_end = &process_queue;
107 static int process_object(struct object *obj)
109 if (obj->type == commit_type) {
110 if (process_commit((struct commit *)obj))
111 return -1;
112 return 0;
114 if (obj->type == tree_type) {
115 if (process_tree((struct tree *)obj))
116 return -1;
117 return 0;
119 if (obj->type == blob_type) {
120 return 0;
122 if (obj->type == tag_type) {
123 if (process_tag((struct tag *)obj))
124 return -1;
125 return 0;
127 return error("Unable to determine requirements "
128 "of type %s for %s",
129 obj->type, sha1_to_hex(obj->sha1));
132 static int process(struct object *obj)
134 if (obj->flags & SEEN)
135 return 0;
136 obj->flags |= SEEN;
138 if (has_sha1_file(obj->sha1)) {
139 /* We already have it, so we should scan it now. */
140 obj->flags |= TO_SCAN;
141 } else {
142 if (obj->flags & COMPLETE)
143 return 0;
144 prefetch(obj->sha1);
147 object_list_insert(obj, process_queue_end);
148 process_queue_end = &(*process_queue_end)->next;
149 return 0;
152 static int loop(void)
154 struct object_list *elem;
156 while (process_queue) {
157 struct object *obj = process_queue->item;
158 elem = process_queue;
159 process_queue = elem->next;
160 free(elem);
161 if (!process_queue)
162 process_queue_end = &process_queue;
164 /* If we are not scanning this object, we placed it in
165 * the queue because we needed to fetch it first.
167 if (! (obj->flags & TO_SCAN)) {
168 if (fetch(obj->sha1)) {
169 report_missing(obj->type
170 ? obj->type
171 : "object", obj->sha1);
172 return -1;
175 if (!obj->type)
176 parse_object(obj->sha1);
177 if (process_object(obj))
178 return -1;
180 return 0;
183 static int interpret_target(char *target, unsigned char *sha1)
185 if (!get_sha1_hex(target, sha1))
186 return 0;
187 if (!check_ref_format(target)) {
188 if (!fetch_ref(target, sha1)) {
189 return 0;
192 return -1;
195 static int mark_complete(const char *path, const unsigned char *sha1)
197 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
198 if (commit) {
199 commit->object.flags |= COMPLETE;
200 insert_by_date(commit, &complete);
202 return 0;
205 int pull(char *target)
207 unsigned char sha1[20];
208 int fd = -1;
210 save_commit_buffer = 0;
211 track_object_refs = 0;
212 if (write_ref && current_ref) {
213 fd = lock_ref_sha1(write_ref, current_ref);
214 if (fd < 0)
215 return -1;
218 if (!get_recover) {
219 for_each_ref(mark_complete);
222 if (interpret_target(target, sha1))
223 return error("Could not interpret %s as something to pull",
224 target);
225 if (process(lookup_unknown_object(sha1)))
226 return -1;
227 if (loop())
228 return -1;
230 if (write_ref) {
231 if (current_ref) {
232 write_ref_sha1(write_ref, fd, sha1);
233 } else {
234 write_ref_sha1_unlocked(write_ref, sha1);
237 return 0;