ui-snapshot.c

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