[PATCH] Various transport programs
[git/git.git] / http-pull.c
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6eb7ed54
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1#include <fcntl.h>
2#include <unistd.h>
3#include <string.h>
4#include <stdlib.h>
5#include "cache.h"
6#include "commit.h"
7#include <errno.h>
8#include <stdio.h>
9
10#include <curl/curl.h>
11#include <curl/easy.h>
12
13static CURL *curl;
14
15static char *base;
16
17static int tree = 0;
18static int commits = 0;
19static int all = 0;
20
21static SHA_CTX c;
22static z_stream stream;
23
24static int local;
25static int zret;
26
27static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
28 void *data) {
29 char expn[4096];
30 size_t size = eltsize * nmemb;
31 int posn = 0;
32 do {
33 ssize_t retval = write(local, ptr + posn, size - posn);
34 if (retval < 0)
35 return posn;
36 posn += retval;
37 } while (posn < size);
38
39 stream.avail_in = size;
40 stream.next_in = ptr;
41 do {
42 stream.next_out = expn;
43 stream.avail_out = sizeof(expn);
44 zret = inflate(&stream, Z_SYNC_FLUSH);
45 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
46 } while (stream.avail_in && zret == Z_OK);
47 return size;
48}
49
50static int fetch(unsigned char *sha1)
51{
52 char *hex = sha1_to_hex(sha1);
53 char *filename = sha1_file_name(sha1);
54 char real_sha1[20];
55 char *url;
56 char *posn;
57
58 if (has_sha1_file(sha1)) {
59 return 0;
60 }
61
62 local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
63
64 if (local < 0)
65 return error("Couldn't open %s\n", filename);
66
67 memset(&stream, 0, sizeof(stream));
68
69 inflateInit(&stream);
70
71 SHA1_Init(&c);
72
73 curl_easy_setopt(curl, CURLOPT_FILE, NULL);
74 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
75
76 url = malloc(strlen(base) + 50);
77 strcpy(url, base);
78 posn = url + strlen(base);
79 strcpy(posn, "objects/");
80 posn += 8;
81 memcpy(posn, hex, 2);
82 posn += 2;
83 *(posn++) = '/';
84 strcpy(posn, hex + 2);
85
86 curl_easy_setopt(curl, CURLOPT_URL, url);
87
88 /*printf("Getting %s\n", hex);*/
89
90 if (curl_easy_perform(curl))
91 return error("Couldn't get %s for %s\n", url, hex);
92
93 close(local);
94 inflateEnd(&stream);
95 SHA1_Final(real_sha1, &c);
96 if (zret != Z_STREAM_END) {
97 unlink(filename);
98 return error("File %s (%s) corrupt\n", hex, url);
99 }
100 if (memcmp(sha1, real_sha1, 20)) {
101 unlink(filename);
102 return error("File %s has bad hash\n", hex);
103 }
104
105 return 0;
106}
107
108static int process_tree(unsigned char *sha1)
109{
110 struct tree *tree = lookup_tree(sha1);
111 struct tree_entry_list *entries;
112
113 if (parse_tree(tree))
114 return -1;
115
116 for (entries = tree->entries; entries; entries = entries->next) {
117 if (fetch(entries->item.tree->object.sha1))
118 return -1;
119 if (entries->directory) {
120 if (process_tree(entries->item.tree->object.sha1))
121 return -1;
122 }
123 }
124 return 0;
125}
126
127static int process_commit(unsigned char *sha1)
128{
129 struct commit *obj = lookup_commit(sha1);
130
131 if (fetch(sha1))
132 return -1;
133
134 if (parse_commit(obj))
135 return -1;
136
137 if (tree) {
138 if (fetch(obj->tree->object.sha1))
139 return -1;
140 if (process_tree(obj->tree->object.sha1))
141 return -1;
142 if (!all)
143 tree = 0;
144 }
145 if (commits) {
146 struct commit_list *parents = obj->parents;
147 for (; parents; parents = parents->next) {
148 if (has_sha1_file(parents->item->object.sha1))
149 continue;
150 if (fetch(parents->item->object.sha1)) {
151 /* The server might not have it, and
152 * we don't mind.
153 */
154 continue;
155 }
156 if (process_commit(parents->item->object.sha1))
157 return -1;
158 }
159 }
160 return 0;
161}
162
163int main(int argc, char **argv)
164{
165 char *commit_id;
166 char *url;
167 int arg = 1;
168 unsigned char sha1[20];
169
170 while (arg < argc && argv[arg][0] == '-') {
171 if (argv[arg][1] == 't') {
172 tree = 1;
173 } else if (argv[arg][1] == 'c') {
174 commits = 1;
175 } else if (argv[arg][1] == 'a') {
176 all = 1;
177 tree = 1;
178 commits = 1;
179 }
180 arg++;
181 }
182 if (argc < arg + 2) {
183 usage("http-pull [-c] [-t] [-a] commit-id url");
184 return 1;
185 }
186 commit_id = argv[arg];
187 url = argv[arg + 1];
188
189 get_sha1_hex(commit_id, sha1);
190
191 curl_global_init(CURL_GLOBAL_ALL);
192
193 curl = curl_easy_init();
194
195 base = url;
196
197 if (fetch(sha1))
198 return 1;
199 if (process_commit(sha1))
200 return 1;
201
202 curl_global_cleanup();
203 return 0;
204}