ui-snapshot.c (view raw)
1/* ui-snapshot.c: generate snapshot of a commit
2 *
3 * Copyright (C) 2006 Lars Hjemli
4 * Copyright (C) 2012 Jason A. Donenfeld <Jason@zx2c4.com>
5 *
6 * Licensed under GNU General Public License v2
7 * (see COPYING for full license text)
8 */
9
10#include "cgit.h"
11#include "html.h"
12#include "ui-shared.h"
13
14static int write_archive_type(const char *format, const char *hex, const char *prefix)
15{
16 struct argv_array argv = ARGV_ARRAY_INIT;
17 argv_array_push(&argv, format);
18 if (prefix) {
19 argv_array_push(&argv, "--prefix");
20 argv_array_push(&argv, fmt("%s/", prefix));
21 }
22 argv_array_push(&argv, hex);
23 return write_archive(argv.argc, argv.argv, NULL, 1, NULL, 0);
24}
25
26static int write_tar_archive(const char *hex, const char *prefix)
27{
28 return write_archive_type("--format=tar", hex, prefix);
29}
30
31static int write_zip_archive(const char *hex, const char *prefix)
32{
33 return write_archive_type("--format=zip", hex, prefix);
34}
35
36static int write_compressed_tar_archive(const char *hex,
37 const char *prefix,
38 char *filter_argv[])
39{
40 int rv;
41 struct cgit_filter f;
42
43 f.cmd = filter_argv[0];
44 f.argv = filter_argv;
45 cgit_open_filter(&f);
46 rv = write_tar_archive(hex, prefix);
47 cgit_close_filter(&f);
48 return rv;
49}
50
51static int write_tar_gzip_archive(const char *hex, const char *prefix)
52{
53 char *argv[] = { "gzip", "-n", NULL };
54 return write_compressed_tar_archive(hex, prefix, argv);
55}
56
57static int write_tar_bzip2_archive(const char *hex, const char *prefix)
58{
59 char *argv[] = { "bzip2", NULL };
60 return write_compressed_tar_archive(hex, prefix, argv);
61}
62
63static int write_tar_xz_archive(const char *hex, const char *prefix)
64{
65 char *argv[] = { "xz", NULL };
66 return write_compressed_tar_archive(hex, prefix, argv);
67}
68
69const struct cgit_snapshot_format cgit_snapshot_formats[] = {
70 { ".zip", "application/x-zip", write_zip_archive, 0x01 },
71 { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 },
72 { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 },
73 { ".tar", "application/x-tar", write_tar_archive, 0x08 },
74 { ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 },
75 { NULL }
76};
77
78static const struct cgit_snapshot_format *get_format(const char *filename)
79{
80 const struct cgit_snapshot_format *fmt;
81 int fl, sl;
82
83 fl = strlen(filename);
84 for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
85 sl = strlen(fmt->suffix);
86 if (sl >= fl)
87 continue;
88 if (!strcmp(fmt->suffix, filename + fl - sl))
89 return fmt;
90 }
91 return NULL;
92}
93
94static int make_snapshot(const struct cgit_snapshot_format *format,
95 const char *hex, const char *prefix,
96 const char *filename)
97{
98 unsigned char sha1[20];
99
100 if (get_sha1(hex, sha1)) {
101 cgit_print_error(fmt("Bad object id: %s", hex));
102 return 1;
103 }
104 if (!lookup_commit_reference(sha1)) {
105 cgit_print_error(fmt("Not a commit reference: %s", hex));
106 return 1;
107 }
108 ctx.page.mimetype = xstrdup(format->mimetype);
109 ctx.page.filename = xstrdup(filename);
110 cgit_print_http_headers(&ctx);
111 format->write_func(hex, prefix);
112 return 0;
113}
114
115/* Try to guess the requested revision from the requested snapshot name.
116 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
117 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
118 * Otherwise, if the snapshot name has a prefix matching the result from
119 * repo_basename(), we strip the basename and any following '-' and '_'
120 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
121 * more. If this still isn't a valid commit object name, we check if pre-
122 * pending a 'v' to the remaining snapshot name ("0.7.2" -> "v0.7.2") gives
123 * us something valid.
124 */
125static const char *get_ref_from_filename(const char *url, const char *filename,
126 const struct cgit_snapshot_format *format)
127{
128 const char *reponame;
129 unsigned char sha1[20];
130 char *snapshot;
131
132 snapshot = xstrdup(filename);
133 snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0';
134
135 if (get_sha1(snapshot, sha1) == 0)
136 return snapshot;
137
138 reponame = cgit_repobasename(url);
139 if (prefixcmp(snapshot, reponame) == 0) {
140 snapshot += strlen(reponame);
141 while (snapshot && (*snapshot == '-' || *snapshot == '_'))
142 snapshot++;
143 }
144
145 if (get_sha1(snapshot, sha1) == 0)
146 return snapshot;
147
148 snapshot = fmt("v%s", snapshot);
149 if (get_sha1(snapshot, sha1) == 0)
150 return snapshot;
151
152 return NULL;
153}
154
155void show_error(char *msg)
156{
157 ctx.page.mimetype = "text/html";
158 cgit_print_http_headers(&ctx);
159 cgit_print_docstart(&ctx);
160 cgit_print_pageheader(&ctx);
161 cgit_print_error(msg);
162 cgit_print_docend();
163}
164
165void cgit_print_snapshot(const char *head, const char *hex,
166 const char *filename, int snapshots, int dwim)
167{
168 const struct cgit_snapshot_format* f;
169 char *prefix = NULL;
170
171 if (!filename) {
172 show_error("No snapshot name specified");
173 return;
174 }
175
176 f = get_format(filename);
177 if (!f) {
178 show_error(xstrdup(fmt("Unsupported snapshot format: %s",
179 filename)));
180 return;
181 }
182
183 if (!hex && dwim) {
184 hex = get_ref_from_filename(ctx.repo->url, filename, f);
185 if (hex == NULL) {
186 html_status(404, "Not found", 0);
187 return;
188 }
189 prefix = xstrdup(filename);
190 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
191 }
192
193 if (!hex)
194 hex = head;
195
196 if (!prefix)
197 prefix = xstrdup(cgit_repobasename(ctx.repo->url));
198
199 make_snapshot(f, hex, prefix, filename);
200 free(prefix);
201}