1 /* ui-snapshot.c: generate snapshot of a commit
3 * Copyright (C) 2006 Lars Hjemli
4 * Copyright (C) 2012 Jason A. Donenfeld <Jason@zx2c4.com>
6 * Licensed under GNU General Public License v2
7 * (see COPYING for full license text)
11 #include "ui-snapshot.h"
13 #include "ui-shared.h"
15 static int write_archive_type(const char *format, const char *hex, const char *prefix)
17 struct argv_array argv = ARGV_ARRAY_INIT;
18 argv_array_push(&argv, "snapshot");
19 argv_array_push(&argv, format);
21 argv_array_push(&argv, "--prefix");
22 argv_array_push(&argv, fmt("%s/", prefix));
24 argv_array_push(&argv, hex);
25 return write_archive(argv.argc, argv.argv, NULL, 1, NULL, 0);
28 static int write_tar_archive(const char *hex, const char *prefix)
30 return write_archive_type("--format=tar", hex, prefix);
33 static int write_zip_archive(const char *hex, const char *prefix)
35 return write_archive_type("--format=zip", hex, prefix);
38 static int write_compressed_tar_archive(const char *hex,
45 f.cmd = filter_argv[0];
48 rv = write_tar_archive(hex, prefix);
49 cgit_close_filter(&f);
53 static int write_tar_gzip_archive(const char *hex, const char *prefix)
55 char *argv[] = { "gzip", "-n", NULL };
56 return write_compressed_tar_archive(hex, prefix, argv);
59 static int write_tar_bzip2_archive(const char *hex, const char *prefix)
61 char *argv[] = { "bzip2", NULL };
62 return write_compressed_tar_archive(hex, prefix, argv);
65 static int write_tar_xz_archive(const char *hex, const char *prefix)
67 char *argv[] = { "xz", NULL };
68 return write_compressed_tar_archive(hex, prefix, argv);
71 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
72 { ".zip", "application/x-zip", write_zip_archive, 0x01 },
73 { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 },
74 { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 },
75 { ".tar", "application/x-tar", write_tar_archive, 0x08 },
76 { ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 },
80 static const struct cgit_snapshot_format *get_format(const char *filename)
82 const struct cgit_snapshot_format *fmt;
85 fl = strlen(filename);
86 for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
87 sl = strlen(fmt->suffix);
90 if (!strcmp(fmt->suffix, filename + fl - sl))
96 static int make_snapshot(const struct cgit_snapshot_format *format,
97 const char *hex, const char *prefix,
100 unsigned char sha1[20];
102 if (get_sha1(hex, sha1)) {
103 cgit_print_error("Bad object id: %s", hex);
106 if (!lookup_commit_reference(sha1)) {
107 cgit_print_error("Not a commit reference: %s", hex);
110 ctx.page.mimetype = xstrdup(format->mimetype);
111 ctx.page.filename = xstrdup(filename);
112 cgit_print_http_headers(&ctx);
113 format->write_func(hex, prefix);
117 /* Try to guess the requested revision from the requested snapshot name.
118 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
119 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
120 * Otherwise, if the snapshot name has a prefix matching the result from
121 * repo_basename(), we strip the basename and any following '-' and '_'
122 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
123 * more. If this still isn't a valid commit object name, we check if pre-
124 * pending a 'v' to the remaining snapshot name ("0.7.2" -> "v0.7.2") gives
125 * us something valid.
127 static const char *get_ref_from_filename(const char *url, const char *filename,
128 const struct cgit_snapshot_format *format)
130 const char *reponame;
131 unsigned char sha1[20];
134 snapshot = xstrdup(filename);
135 snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0';
137 if (get_sha1(snapshot, sha1) == 0)
140 reponame = cgit_repobasename(url);
141 if (prefixcmp(snapshot, reponame) == 0) {
142 snapshot += strlen(reponame);
143 while (snapshot && (*snapshot == '-' || *snapshot == '_'))
147 if (get_sha1(snapshot, sha1) == 0)
150 snapshot = fmt("v%s", snapshot);
151 if (get_sha1(snapshot, sha1) == 0)
157 __attribute__((format (printf, 1, 2)))
158 static void show_error(char *fmt, ...)
162 ctx.page.mimetype = "text/html";
163 cgit_print_http_headers(&ctx);
164 cgit_print_docstart(&ctx);
165 cgit_print_pageheader(&ctx);
167 cgit_vprint_error(fmt, ap);
172 void cgit_print_snapshot(const char *head, const char *hex,
173 const char *filename, int snapshots, int dwim)
175 const struct cgit_snapshot_format* f;
179 show_error("No snapshot name specified");
183 f = get_format(filename);
185 show_error("Unsupported snapshot format: %s", filename);
190 hex = get_ref_from_filename(ctx.repo->url, filename, f);
192 html_status(404, "Not found", 0);
195 prefix = xstrdup(filename);
196 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
203 prefix = xstrdup(cgit_repobasename(ctx.repo->url));
205 make_snapshot(f, hex, prefix, filename);