[PATCH] Pull misc objects
[git/git.git] / pull.c
1 #include "pull.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 /* 1 means "get delta", 2 means "really check delta harder */
17 int get_delta = 1;
18 int get_all = 0;
19 int get_verbosely = 0;
20 static unsigned char current_commit_sha1[20];
21
22 static const char commitS[] = "commit";
23 static const char treeS[] = "tree";
24 static const char blobS[] = "blob";
25
26 void pull_say(const char *fmt, const char *hex) {
27 if (get_verbosely)
28 fprintf(stderr, fmt, hex);
29 }
30
31 static void report_missing(const char *what, const unsigned char *missing)
32 {
33 char missing_hex[41];
34
35 strcpy(missing_hex, sha1_to_hex(missing));;
36 fprintf(stderr,
37 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
38 what, missing_hex, sha1_to_hex(current_commit_sha1));
39 }
40
41 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
42 {
43 int status = 0;
44
45 if (!has_sha1_file(sha1)) {
46 status = fetch(sha1);
47 if (status && what)
48 report_missing(what, sha1);
49 }
50 else if (get_delta < 2)
51 return 0;
52
53 if (get_delta) {
54 unsigned char delta_sha1[20];
55 status = sha1_delta_base(sha1, delta_sha1);
56 if (0 < status)
57 status = make_sure_we_have_it(what, delta_sha1);
58 }
59 return status;
60 }
61
62 static int process_unknown(unsigned char *sha1);
63
64 static int process_tree(unsigned char *sha1)
65 {
66 struct tree *tree = lookup_tree(sha1);
67 struct tree_entry_list *entries;
68
69 if (parse_tree(tree))
70 return -1;
71
72 for (entries = tree->entries; entries; entries = entries->next) {
73 const char *what = entries->directory ? treeS : blobS;
74 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
75 return -1;
76 if (entries->directory) {
77 if (process_tree(entries->item.tree->object.sha1))
78 return -1;
79 }
80 }
81 return 0;
82 }
83
84 static int process_commit(unsigned char *sha1)
85 {
86 struct commit *obj = lookup_commit(sha1);
87
88 if (make_sure_we_have_it(commitS, sha1))
89 return -1;
90
91 if (parse_commit(obj))
92 return -1;
93
94 if (get_tree) {
95 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
96 return -1;
97 if (process_tree(obj->tree->object.sha1))
98 return -1;
99 if (!get_all)
100 get_tree = 0;
101 }
102 if (get_history) {
103 struct commit_list *parents = obj->parents;
104 for (; parents; parents = parents->next) {
105 if (has_sha1_file(parents->item->object.sha1))
106 continue;
107 if (make_sure_we_have_it(NULL,
108 parents->item->object.sha1)) {
109 /* The server might not have it, and
110 * we don't mind.
111 */
112 continue;
113 }
114 if (process_commit(parents->item->object.sha1))
115 return -1;
116 memcpy(current_commit_sha1, sha1, 20);
117 }
118 }
119 return 0;
120 }
121
122 static int process_tag(unsigned char *sha1)
123 {
124 struct tag *obj = lookup_tag(sha1);
125
126 if (parse_tag(obj))
127 return -1;
128 return process_unknown(obj->tagged->sha1);
129 }
130
131 static int process_unknown(unsigned char *sha1)
132 {
133 struct object *obj;
134 if (make_sure_we_have_it("object", sha1))
135 return -1;
136 obj = parse_object(sha1);
137 if (!obj)
138 return error("Unable to parse object %s", sha1_to_hex(sha1));
139 if (obj->type == commit_type)
140 return process_commit(sha1);
141 if (obj->type == tree_type)
142 return process_tree(sha1);
143 if (obj->type == blob_type)
144 return 0;
145 if (obj->type == tag_type)
146 return process_tag(sha1);
147 return error("Unable to determine requirement of type %s for %s",
148 obj->type, sha1_to_hex(sha1));
149 }
150
151 static int interpret_target(char *target, unsigned char *sha1)
152 {
153 if (!get_sha1_hex(target, sha1))
154 return 0;
155 if (!check_ref_format(target)) {
156 if (!fetch_ref(target, sha1)) {
157 return 0;
158 }
159 }
160 return -1;
161 }
162
163
164 int pull(char *target)
165 {
166 unsigned char sha1[20];
167 int fd = -1;
168
169 if (write_ref && current_ref) {
170 fd = lock_ref_sha1(write_ref, current_ref);
171 if (fd < 0)
172 return -1;
173 }
174
175 if (interpret_target(target, sha1))
176 return error("Could not interpret %s as something to pull",
177 target);
178 if (process_unknown(sha1))
179 return -1;
180
181 if (write_ref) {
182 if (current_ref) {
183 write_ref_sha1(write_ref, fd, sha1);
184 } else {
185 write_ref_sha1_unlocked(write_ref, sha1);
186 }
187 }
188 return 0;
189 }