[PATCH] Object library enhancements
[git/git.git] / pull.c
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1#include "pull.h"
2
3#include "cache.h"
4#include "commit.h"
5#include "tree.h"
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6#include "tag.h"
7#include "blob.h"
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8#include "refs.h"
9
10const char *write_ref = NULL;
11
12const unsigned char *current_ref = NULL;
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13
14int get_tree = 0;
15int get_history = 0;
16int get_all = 0;
e78d9772 17int get_verbosely = 0;
b2d62f16 18static unsigned char current_commit_sha1[20];
4250a5e5 19
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20static const char commitS[] = "commit";
21static const char treeS[] = "tree";
22static const char blobS[] = "blob";
23
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24void pull_say(const char *fmt, const char *hex) {
25 if (get_verbosely)
26 fprintf(stderr, fmt, hex);
27}
28
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29static void report_missing(const char *what, const unsigned char *missing)
30{
31 char missing_hex[41];
32
33 strcpy(missing_hex, sha1_to_hex(missing));;
34 fprintf(stderr,
35 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
36 what, missing_hex, sha1_to_hex(current_commit_sha1));
37}
38
39static int make_sure_we_have_it(const char *what, unsigned char *sha1)
ee4f439f 40{
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41 int status = 0;
42
43 if (!has_sha1_file(sha1)) {
44 status = fetch(sha1);
45 if (status && what)
46 report_missing(what, sha1);
47 }
b2d62f16 48 return status;
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49}
50
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51static int process_unknown(unsigned char *sha1);
52
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53static int process_tree(unsigned char *sha1)
54{
55 struct tree *tree = lookup_tree(sha1);
56 struct tree_entry_list *entries;
57
58 if (parse_tree(tree))
59 return -1;
60
61 for (entries = tree->entries; entries; entries = entries->next) {
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62 const char *what = entries->directory ? treeS : blobS;
63 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
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64 return -1;
65 if (entries->directory) {
66 if (process_tree(entries->item.tree->object.sha1))
67 return -1;
68 }
69 }
70 return 0;
71}
72
73static int process_commit(unsigned char *sha1)
74{
75 struct commit *obj = lookup_commit(sha1);
76
b2d62f16 77 if (make_sure_we_have_it(commitS, sha1))
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78 return -1;
79
80 if (parse_commit(obj))
81 return -1;
82
83 if (get_tree) {
b2d62f16 84 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
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85 return -1;
86 if (process_tree(obj->tree->object.sha1))
87 return -1;
88 if (!get_all)
89 get_tree = 0;
90 }
91 if (get_history) {
92 struct commit_list *parents = obj->parents;
93 for (; parents; parents = parents->next) {
94 if (has_sha1_file(parents->item->object.sha1))
95 continue;
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96 if (make_sure_we_have_it(NULL,
97 parents->item->object.sha1)) {
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98 /* The server might not have it, and
99 * we don't mind.
100 */
101 continue;
102 }
103 if (process_commit(parents->item->object.sha1))
104 return -1;
b2d62f16 105 memcpy(current_commit_sha1, sha1, 20);
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106 }
107 }
108 return 0;
109}
110
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111static int process_tag(unsigned char *sha1)
112{
113 struct tag *obj = lookup_tag(sha1);
114
115 if (parse_tag(obj))
116 return -1;
117 return process_unknown(obj->tagged->sha1);
118}
119
120static int process_unknown(unsigned char *sha1)
121{
122 struct object *obj;
123 if (make_sure_we_have_it("object", sha1))
124 return -1;
125 obj = parse_object(sha1);
126 if (!obj)
127 return error("Unable to parse object %s", sha1_to_hex(sha1));
128 if (obj->type == commit_type)
129 return process_commit(sha1);
130 if (obj->type == tree_type)
131 return process_tree(sha1);
132 if (obj->type == blob_type)
133 return 0;
134 if (obj->type == tag_type)
135 return process_tag(sha1);
136 return error("Unable to determine requirement of type %s for %s",
137 obj->type, sha1_to_hex(sha1));
138}
139
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140static int interpret_target(char *target, unsigned char *sha1)
141{
142 if (!get_sha1_hex(target, sha1))
143 return 0;
144 if (!check_ref_format(target)) {
145 if (!fetch_ref(target, sha1)) {
146 return 0;
147 }
148 }
149 return -1;
150}
151
152
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153int pull(char *target)
154{
4250a5e5 155 unsigned char sha1[20];
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156 int fd = -1;
157
158 if (write_ref && current_ref) {
159 fd = lock_ref_sha1(write_ref, current_ref);
160 if (fd < 0)
161 return -1;
162 }
163
164 if (interpret_target(target, sha1))
165 return error("Could not interpret %s as something to pull",
166 target);
3173bd49 167 if (process_unknown(sha1))
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168 return -1;
169
170 if (write_ref) {
171 if (current_ref) {
172 write_ref_sha1(write_ref, fd, sha1);
173 } else {
174 write_ref_sha1_unlocked(write_ref, sha1);
175 }
176 }
177 return 0;
4250a5e5 178}