Rename environment variables.
[git.git] / pull.c
1 #include "pull.h"
2
3 #include "cache.h"
4 #include "commit.h"
5 #include "tree.h"
6
7 int get_tree = 0;
8 int get_history = 0;
9 int get_all = 0;
10 int get_verbosely = 0;
11 static unsigned char current_commit_sha1[20];
12
13 static const char commitS[] = "commit";
14 static const char treeS[] = "tree";
15 static const char blobS[] = "blob";
16
17 void pull_say(const char *fmt, const char *hex) {
18         if (get_verbosely)
19                 fprintf(stderr, fmt, hex);
20 }
21
22 static void report_missing(const char *what, const unsigned char *missing)
23 {
24         char missing_hex[41];
25
26         strcpy(missing_hex, sha1_to_hex(missing));;
27         fprintf(stderr,
28                 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
29                 what, missing_hex, sha1_to_hex(current_commit_sha1));
30 }
31
32 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
33 {
34         int status;
35         if (has_sha1_file(sha1))
36                 return 0;
37         status = fetch(sha1);
38         if (status && what)
39                 report_missing(what, sha1);
40         return status;
41 }
42
43 static int process_tree(unsigned char *sha1)
44 {
45         struct tree *tree = lookup_tree(sha1);
46         struct tree_entry_list *entries;
47
48         if (parse_tree(tree))
49                 return -1;
50
51         for (entries = tree->entries; entries; entries = entries->next) {
52                 const char *what = entries->directory ? treeS : blobS;
53                 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
54                         return -1;
55                 if (entries->directory) {
56                         if (process_tree(entries->item.tree->object.sha1))
57                                 return -1;
58                 }
59         }
60         return 0;
61 }
62
63 static int process_commit(unsigned char *sha1)
64 {
65         struct commit *obj = lookup_commit(sha1);
66
67         if (make_sure_we_have_it(commitS, sha1))
68                 return -1;
69
70         if (parse_commit(obj))
71                 return -1;
72
73         if (get_tree) {
74                 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
75                         return -1;
76                 if (process_tree(obj->tree->object.sha1))
77                         return -1;
78                 if (!get_all)
79                         get_tree = 0;
80         }
81         if (get_history) {
82                 struct commit_list *parents = obj->parents;
83                 for (; parents; parents = parents->next) {
84                         if (has_sha1_file(parents->item->object.sha1))
85                                 continue;
86                         if (make_sure_we_have_it(NULL,
87                                                  parents->item->object.sha1)) {
88                                 /* The server might not have it, and
89                                  * we don't mind. 
90                                  */
91                                 continue;
92                         }
93                         if (process_commit(parents->item->object.sha1))
94                                 return -1;
95                         memcpy(current_commit_sha1, sha1, 20);
96                 }
97         }
98         return 0;
99 }
100
101 int pull(char *target)
102 {
103         int retval;
104         unsigned char sha1[20];
105         retval = get_sha1_hex(target, sha1);
106         if (retval)
107                 return retval;
108         retval = make_sure_we_have_it(commitS, sha1);
109         if (retval)
110                 return retval;
111         memcpy(current_commit_sha1, sha1, 20);
112         return process_commit(sha1);
113 }