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 static int write_tar_xz_archive(struct archiver_args *args)
  39 {
  40         return write_compressed_tar_archive(args,"xz");
  41 }
  42
  43 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
  44         { ".zip", "application/x-zip", write_zip_archive, 0x01 },
  45         { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 },
  46         { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 },
  47         { ".tar", "application/x-tar", write_tar_archive, 0x08 },
  48         { ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 },
  49         {}
  50 };
  51
  52 static const struct cgit_snapshot_format *get_format(const char *filename)
  53 {
  54         const struct cgit_snapshot_format *fmt;
  55         int fl, sl;
  56
  57         fl = strlen(filename);
  58         for(fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
  59                 sl = strlen(fmt->suffix);
  60                 if (sl >= fl)
  61                         continue;
  62                 if (!strcmp(fmt->suffix, filename + fl - sl))
  63                         return fmt;
  64         }
  65         return NULL;
  66 }
  67
  68 static int make_snapshot(const struct cgit_snapshot_format *format,
  69                          const char *hex, const char *prefix,
  70                          const char *filename)
  71 {
  72         struct archiver_args args;
  73         struct commit *commit;
  74         unsigned char sha1[20];
  75
  76         if(get_sha1(hex, sha1)) {
  77                 cgit_print_error(fmt("Bad object id: %s", hex));
  78                 return 1;
  79         }
  80         commit = lookup_commit_reference(sha1);
  81         if(!commit) {
  82                 cgit_print_error(fmt("Not a commit reference: %s", hex));
  83                 return 1;
  84         }
  85         memset(&args, 0, sizeof(args));
  86         if (prefix) {
  87                 args.base = fmt("%s/", prefix);
  88                 args.baselen = strlen(prefix) + 1;
  89         } else {
  90                 args.base = "";
  91                 args.baselen = 0;
  92         }
  93         args.tree = commit->tree;
  94         args.time = commit->date;
  95         ctx.page.mimetype = xstrdup(format->mimetype);
  96         ctx.page.filename = xstrdup(filename);
  97         cgit_print_http_headers(&ctx);
  98         format->write_func(&args);
  99         return 0;
 100 }
 101
 102 /* Try to guess the requested revision from the requested snapshot name.
 103  * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
 104  * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
 105  * Otherwise, if the snapshot name has a prefix matching the result from
 106  * repo_basename(), we strip the basename and any following '-' and '_'
 107  * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
 108  * more. If this still isn't a valid commit object name, we check if pre-
 109  * pending a 'v' to the remaining snapshot name ("0.7.2" -> "v0.7.2") gives
 110  * us something valid.
 111  */
 112 static const char *get_ref_from_filename(const char *url, const char *filename,
 113                                          const struct cgit_snapshot_format *format)
 114 {
 115         const char *reponame;
 116         unsigned char sha1[20];
 117         char *snapshot;
 118
 119         snapshot = xstrdup(filename);
 120         snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0';
 121         fprintf(stderr, "snapshot=%s\n", snapshot);
 122
 123         if (get_sha1(snapshot, sha1) == 0)
 124                 return snapshot;
 125
 126         reponame = cgit_repobasename(url);
 127         fprintf(stderr, "reponame=%s\n", reponame);
 128         if (prefixcmp(snapshot, reponame) == 0) {
 129                 snapshot += strlen(reponame);
 130                 while (snapshot && (*snapshot == '-' || *snapshot == '_'))
 131                         snapshot++;
 132         }
 133
 134         if (get_sha1(snapshot, sha1) == 0)
 135                 return snapshot;
 136
 137         snapshot = fmt("v%s", snapshot);
 138         if (get_sha1(snapshot, sha1) == 0)
 139                 return snapshot;
 140
 141         return NULL;
 142 }
 143
 144 void show_error(char *msg)
 145 {
 146         ctx.page.mimetype = "text/html";
 147         cgit_print_http_headers(&ctx);
 148         cgit_print_docstart(&ctx);
 149         cgit_print_pageheader(&ctx);
 150         cgit_print_error(msg);
 151         cgit_print_docend();
 152 }
 153
 154 void cgit_print_snapshot(const char *head, const char *hex,
 155                          const char *filename, int snapshots, int dwim)
 156 {
 157         const struct cgit_snapshot_format* f;
 158         char *prefix = NULL;
 159
 160         if (!filename) {
 161                 show_error("No snapshot name specified");
 162                 return;
 163         }
 164
 165         f = get_format(filename);
 166         if (!f) {
 167                 show_error(xstrdup(fmt("Unsupported snapshot format: %s",
 168                                        filename)));
 169                 return;
 170         }
 171
 172         if (!hex && dwim) {
 173                 hex = get_ref_from_filename(ctx.repo->url, filename, f);
 174                 if (hex == NULL) {
 175                         html_status(404, "Not found", 0);
 176                         return;
 177                 }
 178                 prefix = xstrdup(filename);
 179                 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
 180         }
 181
 182         if (!hex)
 183                 hex = head;
 184
 185         if (!prefix)
 186                 prefix = xstrdup(cgit_repobasename(ctx.repo->url));
 187
 188         make_snapshot(f, hex, prefix, filename);
 189         free(prefix);
 190 }