1 /* ui-snapshot.c: generate snapshot of a commit
3 * Copyright (C) 2006 Lars Hjemli
5 * Licensed under GNU General Public License v2
6 * (see COPYING for full license text)
11 #include "ui-shared.h"
13 static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
18 f.cmd = xstrdup(filter);
19 f.argv = malloc(2 * sizeof(char *));
23 rv = write_tar_archive(args);
24 cgit_close_filter(&f);
28 static int write_tar_gzip_archive(struct archiver_args *args)
30 return write_compressed_tar_archive(args,"gzip");
33 static int write_tar_bzip2_archive(struct archiver_args *args)
35 return write_compressed_tar_archive(args,"bzip2");
38 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
39 { ".zip", "application/x-zip", write_zip_archive, 0x1 },
40 { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x2 },
41 { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x4 },
42 { ".tar", "application/x-tar", write_tar_archive, 0x8 },
46 static const struct cgit_snapshot_format *get_format(const char *filename)
48 const struct cgit_snapshot_format *fmt;
51 fl = strlen(filename);
52 for(fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
53 sl = strlen(fmt->suffix);
56 if (!strcmp(fmt->suffix, filename + fl - sl))
62 static int make_snapshot(const struct cgit_snapshot_format *format,
63 const char *hex, const char *prefix,
66 struct archiver_args args;
67 struct commit *commit;
68 unsigned char sha1[20];
70 if(get_sha1(hex, sha1)) {
71 cgit_print_error(fmt("Bad object id: %s", hex));
74 commit = lookup_commit_reference(sha1);
76 cgit_print_error(fmt("Not a commit reference: %s", hex));
79 memset(&args, 0, sizeof(args));
81 args.base = fmt("%s/", prefix);
82 args.baselen = strlen(prefix) + 1;
87 args.tree = commit->tree;
88 args.time = commit->date;
89 ctx.page.mimetype = xstrdup(format->mimetype);
90 ctx.page.filename = xstrdup(filename);
91 cgit_print_http_headers(&ctx);
92 format->write_func(&args);
96 /* Try to guess the requested revision from the requested snapshot name.
97 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
98 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
99 * Otherwise, if the snapshot name has a prefix matching the result from
100 * repo_basename(), we strip the basename and any following '-' and '_'
101 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
102 * more. If this still isn't a valid commit object name, we check if pre-
103 * pending a 'v' to the remaining snapshot name ("0.7.2" -> "v0.7.2") gives
104 * us something valid.
106 static const char *get_ref_from_filename(const char *url, const char *filename,
107 const struct cgit_snapshot_format *format)
109 const char *reponame;
110 unsigned char sha1[20];
113 snapshot = xstrdup(filename);
114 snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0';
115 fprintf(stderr, "snapshot=%s\n", snapshot);
117 if (get_sha1(snapshot, sha1) == 0)
120 reponame = cgit_repobasename(url);
121 fprintf(stderr, "reponame=%s\n", reponame);
122 if (prefixcmp(snapshot, reponame) == 0) {
123 snapshot += strlen(reponame);
124 while (snapshot && (*snapshot == '-' || *snapshot == '_'))
128 if (get_sha1(snapshot, sha1) == 0)
131 snapshot = fmt("v%s", snapshot);
132 if (get_sha1(snapshot, sha1) == 0)
138 void show_error(char *msg)
140 ctx.page.mimetype = "text/html";
141 cgit_print_http_headers(&ctx);
142 cgit_print_docstart(&ctx);
143 cgit_print_pageheader(&ctx);
144 cgit_print_error(msg);
148 void cgit_print_snapshot(const char *head, const char *hex,
149 const char *filename, int snapshots, int dwim)
151 const struct cgit_snapshot_format* f;
155 show_error("No snapshot name specified");
159 f = get_format(filename);
161 show_error(xstrdup(fmt("Unsupported snapshot format: %s",
167 hex = get_ref_from_filename(ctx.repo->url, filename, f);
169 html_status(404, "Not found", 0);
172 prefix = xstrdup(filename);
173 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
180 prefix = xstrdup(cgit_repobasename(ctx.repo->url));
182 make_snapshot(f, hex, prefix, filename);