gitweb.ps.run Git - ps-cgit/blob - ui-snapshot.c

   1 /* ui-snapshot.c: generate snapshot of a commit
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #define USE_THE_REPOSITORY_VARIABLE
  10
  11 #include "cgit.h"
  12 #include "ui-snapshot.h"
  13 #include "html.h"
  14 #include "ui-shared.h"
  15
  16 static int write_archive_type(const char *format, const char *hex, const char *prefix)
  17 {
  18         struct strvec argv = STRVEC_INIT;
  19         const char **nargv;
  20         int result;
  21         strvec_push(&argv, "snapshot");
  22         strvec_push(&argv, format);
  23         if (prefix) {
  24                 struct strbuf buf = STRBUF_INIT;
  25                 strbuf_addstr(&buf, prefix);
  26                 strbuf_addch(&buf, '/');
  27                 strvec_push(&argv, "--prefix");
  28                 strvec_push(&argv, buf.buf);
  29                 strbuf_release(&buf);
  30         }
  31         strvec_push(&argv, hex);
  32         /*
  33          * Now we need to copy the pointers to arguments into a new
  34          * structure because write_archive will rearrange its arguments
  35          * which may result in duplicated/missing entries causing leaks
  36          * or double-frees in strvec_clear.
  37          */
  38         nargv = xmalloc(sizeof(char *) * (argv.nr + 1));
  39         /* strvec guarantees a trailing NULL entry. */
  40         memcpy(nargv, argv.v, sizeof(char *) * (argv.nr + 1));
  41
  42         result = write_archive(argv.nr, nargv, NULL, the_repository, NULL, 0);
  43         strvec_clear(&argv);
  44         free(nargv);
  45         return result;
  46 }
  47
  48 static int write_tar_archive(const char *hex, const char *prefix)
  49 {
  50         return write_archive_type("--format=tar", hex, prefix);
  51 }
  52
  53 static int write_zip_archive(const char *hex, const char *prefix)
  54 {
  55         return write_archive_type("--format=zip", hex, prefix);
  56 }
  57
  58 static int write_compressed_tar_archive(const char *hex,
  59                                         const char *prefix,
  60                                         char *filter_argv[])
  61 {
  62         int rv;
  63         struct cgit_exec_filter f;
  64         cgit_exec_filter_init(&f, filter_argv[0], filter_argv);
  65
  66         cgit_open_filter(&f.base);
  67         rv = write_tar_archive(hex, prefix);
  68         cgit_close_filter(&f.base);
  69         return rv;
  70 }
  71
  72 static int write_tar_gzip_archive(const char *hex, const char *prefix)
  73 {
  74         char *argv[] = { "gzip", "-n", NULL };
  75         return write_compressed_tar_archive(hex, prefix, argv);
  76 }
  77
  78 static int write_tar_bzip2_archive(const char *hex, const char *prefix)
  79 {
  80         char *argv[] = { "bzip2", NULL };
  81         return write_compressed_tar_archive(hex, prefix, argv);
  82 }
  83
  84 static int write_tar_lzip_archive(const char *hex, const char *prefix)
  85 {
  86         char *argv[] = { "lzip", NULL };
  87         return write_compressed_tar_archive(hex, prefix, argv);
  88 }
  89
  90 static int write_tar_xz_archive(const char *hex, const char *prefix)
  91 {
  92         char *argv[] = { "xz", NULL };
  93         return write_compressed_tar_archive(hex, prefix, argv);
  94 }
  95
  96 static int write_tar_zstd_archive(const char *hex, const char *prefix)
  97 {
  98         char *argv[] = { "zstd", "-T0", NULL };
  99         return write_compressed_tar_archive(hex, prefix, argv);
 100 }
 101
 102 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
 103         /* .tar must remain the 0 index */
 104         { ".tar",       "application/x-tar",    write_tar_archive       },
 105         { ".tar.gz",    "application/x-gzip",   write_tar_gzip_archive  },
 106         { ".tar.bz2",   "application/x-bzip2",  write_tar_bzip2_archive },
 107         { ".tar.lz",    "application/x-lzip",   write_tar_lzip_archive  },
 108         { ".tar.xz",    "application/x-xz",     write_tar_xz_archive    },
 109         { ".tar.zst",   "application/x-zstd",   write_tar_zstd_archive  },
 110         { ".zip",       "application/x-zip",    write_zip_archive       },
 111         { NULL }
 112 };
 113
 114 static struct notes_tree snapshot_sig_notes[ARRAY_SIZE(cgit_snapshot_formats)];
 115
 116 const struct object_id *cgit_snapshot_get_sig(const char *ref,
 117                                               const struct cgit_snapshot_format *f)
 118 {
 119         struct notes_tree *tree;
 120         struct object_id oid;
 121
 122         if (repo_get_oid(the_repository, ref, &oid))
 123                 return NULL;
 124
 125         tree = &snapshot_sig_notes[f - &cgit_snapshot_formats[0]];
 126         if (!tree->initialized) {
 127                 struct strbuf notes_ref = STRBUF_INIT;
 128
 129                 strbuf_addf(&notes_ref, "refs/notes/signatures/%s",
 130                             f->suffix + 1);
 131
 132                 init_notes(tree, notes_ref.buf, combine_notes_ignore, 0);
 133                 strbuf_release(&notes_ref);
 134         }
 135
 136         return get_note(tree, &oid);
 137 }
 138
 139 static const struct cgit_snapshot_format *get_format(const char *filename)
 140 {
 141         const struct cgit_snapshot_format *fmt;
 142
 143         for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
 144                 if (ends_with(filename, fmt->suffix))
 145                         return fmt;
 146         }
 147         return NULL;
 148 }
 149
 150 const unsigned cgit_snapshot_format_bit(const struct cgit_snapshot_format *f)
 151 {
 152         return BIT(f - &cgit_snapshot_formats[0]);
 153 }
 154
 155 static int make_snapshot(const struct cgit_snapshot_format *format,
 156                          const char *hex, const char *prefix,
 157                          const char *filename)
 158 {
 159         struct object_id oid;
 160
 161         if (repo_get_oid(the_repository, hex, &oid)) {
 162                 cgit_print_error_page(404, "Not found",
 163                                 "Bad object id: %s", hex);
 164                 return 1;
 165         }
 166         if (!lookup_commit_reference(the_repository, &oid)) {
 167                 cgit_print_error_page(400, "Bad request",
 168                                 "Not a commit reference: %s", hex);
 169                 return 1;
 170         }
 171         ctx.page.etag = oid_to_hex(&oid);
 172         ctx.page.mimetype = xstrdup(format->mimetype);
 173         ctx.page.filename = xstrdup(filename);
 174         cgit_print_http_headers();
 175         init_archivers();
 176         format->write_func(hex, prefix);
 177         return 0;
 178 }
 179
 180 static int write_sig(const struct cgit_snapshot_format *format,
 181                      const char *hex, const char *archive,
 182                      const char *filename)
 183 {
 184         const struct object_id *note = cgit_snapshot_get_sig(hex, format);
 185         enum object_type type;
 186         unsigned long size;
 187         char *buf;
 188
 189         if (!note) {
 190                 cgit_print_error_page(404, "Not found",
 191                                 "No signature for %s", archive);
 192                 return 0;
 193         }
 194
 195         buf = repo_read_object_file(the_repository, note, &type, &size);
 196         if (!buf) {
 197                 cgit_print_error_page(404, "Not found", "Not found");
 198                 return 0;
 199         }
 200
 201         html("X-Content-Type-Options: nosniff\n");
 202         html("Content-Security-Policy: default-src 'none'\n");
 203         ctx.page.etag = oid_to_hex(note);
 204         ctx.page.mimetype = xstrdup("application/pgp-signature");
 205         ctx.page.filename = xstrdup(filename);
 206         cgit_print_http_headers();
 207
 208         html_raw(buf, size);
 209         free(buf);
 210         return 0;
 211 }
 212
 213 /* Try to guess the requested revision from the requested snapshot name.
 214  * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
 215  * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
 216  * Otherwise, if the snapshot name has a prefix matching the result from
 217  * repo_basename(), we strip the basename and any following '-' and '_'
 218  * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
 219  * more. If this still isn't a valid commit object name, we check if pre-
 220  * pending a 'v' or a 'V' to the remaining snapshot name ("0.7.2" ->
 221  * "v0.7.2") gives us something valid.
 222  */
 223 static const char *get_ref_from_filename(const struct cgit_repo *repo,
 224                                          const char *filename,
 225                                          const struct cgit_snapshot_format *format)
 226 {
 227         const char *reponame;
 228         struct object_id oid;
 229         struct strbuf snapshot = STRBUF_INIT;
 230         int result = 1;
 231
 232         strbuf_addstr(&snapshot, filename);
 233         strbuf_setlen(&snapshot, snapshot.len - strlen(format->suffix));
 234
 235         if (repo_get_oid(the_repository, snapshot.buf, &oid) == 0)
 236                 goto out;
 237
 238         reponame = cgit_snapshot_prefix(repo);
 239         if (starts_with(snapshot.buf, reponame)) {
 240                 const char *new_start = snapshot.buf;
 241                 new_start += strlen(reponame);
 242                 while (new_start && (*new_start == '-' || *new_start == '_'))
 243                         new_start++;
 244                 strbuf_splice(&snapshot, 0, new_start - snapshot.buf, "", 0);
 245         }
 246
 247         if (repo_get_oid(the_repository, snapshot.buf, &oid) == 0)
 248                 goto out;
 249
 250         strbuf_insert(&snapshot, 0, "v", 1);
 251         if (repo_get_oid(the_repository, snapshot.buf, &oid) == 0)
 252                 goto out;
 253
 254         strbuf_splice(&snapshot, 0, 1, "V", 1);
 255         if (repo_get_oid(the_repository, snapshot.buf, &oid) == 0)
 256                 goto out;
 257
 258         result = 0;
 259         strbuf_release(&snapshot);
 260
 261 out:
 262         return result ? strbuf_detach(&snapshot, NULL) : NULL;
 263 }
 264
 265 void cgit_print_snapshot(const char *head, const char *hex,
 266                          const char *filename, int dwim)
 267 {
 268         const struct cgit_snapshot_format* f;
 269         const char *sig_filename = NULL;
 270         char *adj_filename = NULL;
 271         char *prefix = NULL;
 272
 273         if (!filename) {
 274                 cgit_print_error_page(400, "Bad request",
 275                                 "No snapshot name specified");
 276                 return;
 277         }
 278
 279         if (ends_with(filename, ".asc")) {
 280                 sig_filename = filename;
 281
 282                 /* Strip ".asc" from filename for common format processing */
 283                 adj_filename = xstrdup(filename);
 284                 adj_filename[strlen(adj_filename) - 4] = '\0';
 285                 filename = adj_filename;
 286         }
 287
 288         f = get_format(filename);
 289         if (!f || (!sig_filename && !(ctx.repo->snapshots & cgit_snapshot_format_bit(f)))) {
 290                 cgit_print_error_page(400, "Bad request",
 291                                 "Unsupported snapshot format: %s", filename);
 292                 return;
 293         }
 294
 295         if (!hex && dwim) {
 296                 hex = get_ref_from_filename(ctx.repo, filename, f);
 297                 if (hex == NULL) {
 298                         cgit_print_error_page(404, "Not found", "Not found");
 299                         return;
 300                 }
 301                 prefix = xstrdup(filename);
 302                 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
 303         }
 304
 305         if (!hex)
 306                 hex = head;
 307
 308         if (!prefix)
 309                 prefix = xstrdup(cgit_snapshot_prefix(ctx.repo));
 310
 311         if (sig_filename)
 312                 write_sig(f, hex, filename, sig_filename);
 313         else
 314                 make_snapshot(f, hex, prefix, filename);
 315
 316         free(prefix);
 317         free(adj_filename);
 318 }