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1 | #include "fetch.h" | |
2 | ||
3 | #include "cache.h" | |
4 | #include "commit.h" | |
5 | #include "tree.h" | |
6 | #include "tag.h" | |
7 | #include "blob.h" | |
8 | #include "refs.h" | |
9 | ||
10 | const char *write_ref = NULL; | |
11 | ||
12 | const unsigned char *current_ref = NULL; | |
13 | ||
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]; | |
20 | ||
21 | void pull_say(const char *fmt, const char *hex) | |
22 | { | |
23 | if (get_verbosely) | |
24 | fprintf(stderr, fmt, hex); | |
25 | } | |
26 | ||
27 | static void report_missing(const char *what, const unsigned char *missing) | |
28 | { | |
29 | char missing_hex[41]; | |
30 | ||
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)); | |
35 | } | |
36 | ||
37 | static int process(struct object *obj); | |
38 | ||
39 | static int process_tree(struct tree *tree) | |
40 | { | |
41 | struct tree_entry_list *entry; | |
42 | ||
43 | if (parse_tree(tree)) | |
44 | return -1; | |
45 | ||
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; | |
55 | } | |
56 | return 0; | |
57 | } | |
58 | ||
59 | #define COMPLETE (1U << 0) | |
60 | #define SEEN (1U << 1) | |
61 | #define TO_SCAN (1U << 2) | |
62 | ||
63 | static struct commit_list *complete = NULL; | |
64 | ||
65 | static int process_commit(struct commit *commit) | |
66 | { | |
67 | if (parse_commit(commit)) | |
68 | return -1; | |
69 | ||
70 | while (complete && complete->item->date >= commit->date) { | |
71 | pop_most_recent_commit(&complete, COMPLETE); | |
72 | } | |
73 | ||
74 | if (commit->object.flags & COMPLETE) | |
75 | return 0; | |
76 | ||
77 | memcpy(current_commit_sha1, commit->object.sha1, 20); | |
78 | ||
79 | pull_say("walk %s\n", sha1_to_hex(commit->object.sha1)); | |
80 | ||
81 | if (get_tree) { | |
82 | if (process(&commit->tree->object)) | |
83 | return -1; | |
84 | if (!get_all) | |
85 | get_tree = 0; | |
86 | } | |
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; | |
92 | } | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static int process_tag(struct tag *tag) | |
98 | { | |
99 | if (parse_tag(tag)) | |
100 | return -1; | |
101 | return process(tag->tagged); | |
102 | } | |
103 | ||
104 | static struct object_list *process_queue = NULL; | |
105 | static struct object_list **process_queue_end = &process_queue; | |
106 | ||
107 | static int process_object(struct object *obj) | |
108 | { | |
109 | if (obj->type == commit_type) { | |
110 | if (process_commit((struct commit *)obj)) | |
111 | return -1; | |
112 | return 0; | |
113 | } | |
114 | if (obj->type == tree_type) { | |
115 | if (process_tree((struct tree *)obj)) | |
116 | return -1; | |
117 | return 0; | |
118 | } | |
119 | if (obj->type == blob_type) { | |
120 | return 0; | |
121 | } | |
122 | if (obj->type == tag_type) { | |
123 | if (process_tag((struct tag *)obj)) | |
124 | return -1; | |
125 | return 0; | |
126 | } | |
127 | return error("Unable to determine requirements " | |
128 | "of type %s for %s", | |
129 | obj->type, sha1_to_hex(obj->sha1)); | |
130 | } | |
131 | ||
132 | static int process(struct object *obj) | |
133 | { | |
134 | if (obj->flags & SEEN) | |
135 | return 0; | |
136 | obj->flags |= SEEN; | |
137 | ||
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); | |
145 | } | |
146 | ||
147 | object_list_insert(obj, process_queue_end); | |
148 | process_queue_end = &(*process_queue_end)->next; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int loop(void) | |
153 | { | |
154 | struct object_list *elem; | |
155 | ||
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; | |
163 | ||
164 | /* If we are not scanning this object, we placed it in | |
165 | * the queue because we needed to fetch it first. | |
166 | */ | |
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; | |
173 | } | |
174 | } | |
175 | if (!obj->type) | |
176 | parse_object(obj->sha1); | |
177 | if (process_object(obj)) | |
178 | return -1; | |
179 | } | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int interpret_target(char *target, unsigned char *sha1) | |
184 | { | |
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; | |
190 | } | |
191 | } | |
192 | return -1; | |
193 | } | |
194 | ||
195 | static int mark_complete(const char *path, const unsigned char *sha1) | |
196 | { | |
197 | struct commit *commit = lookup_commit_reference_gently(sha1, 1); | |
198 | if (commit) { | |
199 | commit->object.flags |= COMPLETE; | |
200 | insert_by_date(commit, &complete); | |
201 | } | |
202 | return 0; | |
203 | } | |
204 | ||
205 | int pull(char *target) | |
206 | { | |
207 | unsigned char sha1[20]; | |
208 | int fd = -1; | |
209 | ||
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; | |
216 | } | |
217 | ||
218 | if (!get_recover) { | |
219 | for_each_ref(mark_complete); | |
220 | } | |
221 | ||
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; | |
229 | ||
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); | |
235 | } | |
236 | } | |
237 | return 0; | |
238 | } |