shared.c

   1 /* shared.c: global vars + some callback functions
   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
  11 struct cgit_repolist cgit_repolist;
  12 struct cgit_context ctx;
  13
  14 int chk_zero(int result, char *msg)
  15 {
  16         if (result != 0)
  17                 die("%s: %s", msg, strerror(errno));
  18         return result;
  19 }
  20
  21 int chk_positive(int result, char *msg)
  22 {
  23         if (result <= 0)
  24                 die("%s: %s", msg, strerror(errno));
  25         return result;
  26 }
  27
  28 int chk_non_negative(int result, char *msg)
  29 {
  30         if (result < 0)
  31                 die("%s: %s",msg, strerror(errno));
  32         return result;
  33 }
  34
  35 struct cgit_repo *cgit_add_repo(const char *url)
  36 {
  37         struct cgit_repo *ret;
  38
  39         if (++cgit_repolist.count > cgit_repolist.length) {
  40                 if (cgit_repolist.length == 0)
  41                         cgit_repolist.length = 8;
  42                 else
  43                         cgit_repolist.length *= 2;
  44                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
  45                                                cgit_repolist.length *
  46                                                sizeof(struct cgit_repo));
  47         }
  48
  49         ret = &cgit_repolist.repos[cgit_repolist.count-1];
  50         memset(ret, 0, sizeof(struct cgit_repo));
  51         ret->url = trim_end(url, '/');
  52         ret->name = ret->url;
  53         ret->path = NULL;
  54         ret->desc = "[no description]";
  55         ret->owner = NULL;
  56         ret->section = ctx.cfg.section;
  57         ret->defbranch = "master";
  58         ret->snapshots = ctx.cfg.snapshots;
  59         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
  60         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
  61         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
  62         ret->max_stats = ctx.cfg.max_stats;
  63         ret->module_link = ctx.cfg.module_link;
  64         ret->readme = NULL;
  65         ret->mtime = -1;
  66         ret->about_filter = ctx.cfg.about_filter;
  67         ret->commit_filter = ctx.cfg.commit_filter;
  68         ret->source_filter = ctx.cfg.source_filter;
  69         return ret;
  70 }
  71
  72 struct cgit_repo *cgit_get_repoinfo(const char *url)
  73 {
  74         int i;
  75         struct cgit_repo *repo;
  76
  77         for (i=0; i<cgit_repolist.count; i++) {
  78                 repo = &cgit_repolist.repos[i];
  79                 if (!strcmp(repo->url, url))
  80                         return repo;
  81         }
  82         return NULL;
  83 }
  84
  85 void *cgit_free_commitinfo(struct commitinfo *info)
  86 {
  87         free(info->author);
  88         free(info->author_email);
  89         free(info->committer);
  90         free(info->committer_email);
  91         free(info->subject);
  92         free(info->msg);
  93         free(info->msg_encoding);
  94         free(info);
  95         return NULL;
  96 }
  97
  98 char *trim_end(const char *str, char c)
  99 {
 100         int len;
 101         char *s, *t;
 102
 103         if (str == NULL)
 104                 return NULL;
 105         t = (char *)str;
 106         len = strlen(t);
 107         while(len > 0 && t[len - 1] == c)
 108                 len--;
 109
 110         if (len == 0)
 111                 return NULL;
 112
 113         c = t[len];
 114         t[len] = '\0';
 115         s = xstrdup(t);
 116         t[len] = c;
 117         return s;
 118 }
 119
 120 char *strlpart(char *txt, int maxlen)
 121 {
 122         char *result;
 123
 124         if (!txt)
 125                 return txt;
 126
 127         if (strlen(txt) <= maxlen)
 128                 return txt;
 129         result = xmalloc(maxlen + 1);
 130         memcpy(result, txt, maxlen - 3);
 131         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 132         result[maxlen] = '\0';
 133         return result;
 134 }
 135
 136 char *strrpart(char *txt, int maxlen)
 137 {
 138         char *result;
 139
 140         if (!txt)
 141                 return txt;
 142
 143         if (strlen(txt) <= maxlen)
 144                 return txt;
 145         result = xmalloc(maxlen + 1);
 146         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 147         result[0] = result[1] = result[2] = '.';
 148         return result;
 149 }
 150
 151 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 152 {
 153         size_t size;
 154
 155         if (list->count >= list->alloc) {
 156                 list->alloc += (list->alloc ? list->alloc : 4);
 157                 size = list->alloc * sizeof(struct refinfo *);
 158                 list->refs = xrealloc(list->refs, size);
 159         }
 160         list->refs[list->count++] = ref;
 161 }
 162
 163 struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
 164 {
 165         struct refinfo *ref;
 166
 167         ref = xmalloc(sizeof (struct refinfo));
 168         ref->refname = xstrdup(refname);
 169         ref->object = parse_object(sha1);
 170         switch (ref->object->type) {
 171         case OBJ_TAG:
 172                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 173                 break;
 174         case OBJ_COMMIT:
 175                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 176                 break;
 177         }
 178         return ref;
 179 }
 180
 181 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 182                   void *cb_data)
 183 {
 184         struct reflist *list = (struct reflist *)cb_data;
 185         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 186
 187         if (info)
 188                 cgit_add_ref(list, info);
 189         return 0;
 190 }
 191
 192 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 193                        struct diff_options *options, void *data)
 194 {
 195         int i;
 196
 197         for (i = 0; i < q->nr; i++) {
 198                 if (q->queue[i]->status == 'U')
 199                         continue;
 200                 ((filepair_fn)data)(q->queue[i]);
 201         }
 202 }
 203
 204 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 205 {
 206         enum object_type type;
 207
 208         if (is_null_sha1(sha1)) {
 209                 file->ptr = (char *)"";
 210                 file->size = 0;
 211         } else {
 212                 file->ptr = read_sha1_file(sha1, &type,
 213                                            (unsigned long *)&file->size);
 214         }
 215         return 1;
 216 }
 217
 218 /*
 219  * Receive diff-buffers from xdiff and concatenate them as
 220  * needed across multiple callbacks.
 221  *
 222  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 223  * ripped from git and modified to use globals instead of
 224  * a special callback-struct.
 225  */
 226 char *diffbuf = NULL;
 227 int buflen = 0;
 228
 229 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 230 {
 231         int i;
 232
 233         for (i = 0; i < nbuf; i++) {
 234                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 235                         /* Incomplete line */
 236                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 237                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 238                         buflen += mb[i].size;
 239                         continue;
 240                 }
 241
 242                 /* we have a complete line */
 243                 if (!diffbuf) {
 244                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 245                         continue;
 246                 }
 247                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 248                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 249                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 250                 free(diffbuf);
 251                 diffbuf = NULL;
 252                 buflen = 0;
 253         }
 254         if (diffbuf) {
 255                 ((linediff_fn)priv)(diffbuf, buflen);
 256                 free(diffbuf);
 257                 diffbuf = NULL;
 258                 buflen = 0;
 259         }
 260         return 0;
 261 }
 262
 263 int cgit_diff_files(const unsigned char *old_sha1,
 264                     const unsigned char *new_sha1, unsigned long *old_size,
 265                     unsigned long *new_size, int *binary, int context,
 266                     linediff_fn fn)
 267 {
 268         mmfile_t file1, file2;
 269         xpparam_t diff_params;
 270         xdemitconf_t emit_params;
 271         xdemitcb_t emit_cb;
 272
 273         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 274                 return 1;
 275
 276         *old_size = file1.size;
 277         *new_size = file2.size;
 278
 279         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 280             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 281                 *binary = 1;
 282                 return 0;
 283         }
 284
 285         memset(&diff_params, 0, sizeof(diff_params));
 286         memset(&emit_params, 0, sizeof(emit_params));
 287         memset(&emit_cb, 0, sizeof(emit_cb));
 288         diff_params.flags = XDF_NEED_MINIMAL;
 289         emit_params.ctxlen = context > 0 ? context : 3;
 290         emit_params.flags = XDL_EMIT_FUNCNAMES;
 291         emit_cb.outf = filediff_cb;
 292         emit_cb.priv = fn;
 293         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 294         return 0;
 295 }
 296
 297 void cgit_diff_tree(const unsigned char *old_sha1,
 298                     const unsigned char *new_sha1,
 299                     filepair_fn fn, const char *prefix)
 300 {
 301         struct diff_options opt;
 302         int ret;
 303         int prefixlen;
 304
 305         diff_setup(&opt);
 306         opt.output_format = DIFF_FORMAT_CALLBACK;
 307         opt.detect_rename = 1;
 308         opt.rename_limit = ctx.cfg.renamelimit;
 309         DIFF_OPT_SET(&opt, RECURSIVE);
 310         opt.format_callback = cgit_diff_tree_cb;
 311         opt.format_callback_data = fn;
 312         if (prefix) {
 313                 opt.nr_paths = 1;
 314                 opt.paths = &prefix;
 315                 prefixlen = strlen(prefix);
 316                 opt.pathlens = &prefixlen;
 317         }
 318         diff_setup_done(&opt);
 319
 320         if (old_sha1 && !is_null_sha1(old_sha1))
 321                 ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 322         else
 323                 ret = diff_root_tree_sha1(new_sha1, "", &opt);
 324         diffcore_std(&opt);
 325         diff_flush(&opt);
 326 }
 327
 328 void cgit_diff_commit(struct commit *commit, filepair_fn fn)
 329 {
 330         unsigned char *old_sha1 = NULL;
 331
 332         if (commit->parents)
 333                 old_sha1 = commit->parents->item->object.sha1;
 334         cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL);
 335 }
 336
 337 int cgit_parse_snapshots_mask(const char *str)
 338 {
 339         const struct cgit_snapshot_format *f;
 340         static const char *delim = " \t,:/|;";
 341         int tl, sl, rv = 0;
 342
 343         /* favor legacy setting */
 344         if(atoi(str))
 345                 return 1;
 346         for(;;) {
 347                 str += strspn(str,delim);
 348                 tl = strcspn(str,delim);
 349                 if (!tl)
 350                         break;
 351                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 352                         sl = strlen(f->suffix);
 353                         if((tl == sl && !strncmp(f->suffix, str, tl)) ||
 354                            (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
 355                                 rv |= f->bit;
 356                                 break;
 357                         }
 358                 }
 359                 str += tl;
 360         }
 361         return rv;
 362 }
 363
 364 int cgit_open_filter(struct cgit_filter *filter)
 365 {
 366
 367         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
 368                 "Unable to duplicate STDOUT");
 369         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
 370         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
 371         if (filter->pid == 0) {
 372                 close(filter->pipe_fh[1]);
 373                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
 374                         "Unable to use pipe as STDIN");
 375                 execvp(filter->cmd, filter->argv);
 376                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
 377                         strerror(errno), errno);
 378         }
 379         close(filter->pipe_fh[0]);
 380         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
 381                 "Unable to use pipe as STDOUT");
 382         close(filter->pipe_fh[1]);
 383         return 0;
 384 }
 385
 386 int cgit_close_filter(struct cgit_filter *filter)
 387 {
 388         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
 389                 "Unable to restore STDOUT");
 390         close(filter->old_stdout);
 391         if (filter->pid < 0)
 392                 return 0;
 393         waitpid(filter->pid, &filter->exitstatus, 0);
 394         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
 395                 return 0;
 396         die("Subprocess %s exited abnormally", filter->cmd);
 397 }
 398
 399 /* Read the content of the specified file into a newly allocated buffer,
 400  * zeroterminate the buffer and return 0 on success, errno otherwise.
 401  */
 402 int readfile(const char *path, char **buf, size_t *size)
 403 {
 404         int fd, e;
 405         struct stat st;
 406
 407         fd = open(path, O_RDONLY);
 408         if (fd == -1)
 409                 return errno;
 410         if (fstat(fd, &st)) {
 411                 e = errno;
 412                 close(fd);
 413                 return e;
 414         }
 415         if (!S_ISREG(st.st_mode)) {
 416                 close(fd);
 417                 return EISDIR;
 418         }
 419         *buf = xmalloc(st.st_size + 1);
 420         *size = read_in_full(fd, *buf, st.st_size);
 421         e = errno;
 422         (*buf)[*size] = '\0';
 423         close(fd);
 424         return (*size == st.st_size ? 0 : e);
 425 }