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 int cgit_cmd;
  14
  15 int chk_zero(int result, char *msg)
  16 {
  17         if (result != 0)
  18                 die("%s: %s", msg, strerror(errno));
  19         return result;
  20 }
  21
  22 int chk_positive(int result, char *msg)
  23 {
  24         if (result <= 0)
  25                 die("%s: %s", msg, strerror(errno));
  26         return result;
  27 }
  28
  29 int chk_non_negative(int result, char *msg)
  30 {
  31         if (result < 0)
  32                 die("%s: %s",msg, strerror(errno));
  33         return result;
  34 }
  35
  36 struct cgit_repo *cgit_add_repo(const char *url)
  37 {
  38         struct cgit_repo *ret;
  39
  40         if (++cgit_repolist.count > cgit_repolist.length) {
  41                 if (cgit_repolist.length == 0)
  42                         cgit_repolist.length = 8;
  43                 else
  44                         cgit_repolist.length *= 2;
  45                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
  46                                                cgit_repolist.length *
  47                                                sizeof(struct cgit_repo));
  48         }
  49
  50         ret = &cgit_repolist.repos[cgit_repolist.count-1];
  51         memset(ret, 0, sizeof(struct cgit_repo));
  52         ret->url = trim_end(url, '/');
  53         ret->name = ret->url;
  54         ret->path = NULL;
  55         ret->desc = "[no description]";
  56         ret->owner = NULL;
  57         ret->section = ctx.cfg.section;
  58         ret->defbranch = "master";
  59         ret->snapshots = ctx.cfg.snapshots;
  60         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
  61         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
  62         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
  63         ret->enable_subject_links = ctx.cfg.enable_subject_links;
  64         ret->max_stats = ctx.cfg.max_stats;
  65         ret->module_link = ctx.cfg.module_link;
  66         ret->readme = NULL;
  67         ret->mtime = -1;
  68         ret->about_filter = ctx.cfg.about_filter;
  69         ret->commit_filter = ctx.cfg.commit_filter;
  70         ret->source_filter = ctx.cfg.source_filter;
  71         return ret;
  72 }
  73
  74 struct cgit_repo *cgit_get_repoinfo(const char *url)
  75 {
  76         int i;
  77         struct cgit_repo *repo;
  78
  79         for (i=0; i<cgit_repolist.count; i++) {
  80                 repo = &cgit_repolist.repos[i];
  81                 if (!strcmp(repo->url, url))
  82                         return repo;
  83         }
  84         return NULL;
  85 }
  86
  87 void *cgit_free_commitinfo(struct commitinfo *info)
  88 {
  89         free(info->author);
  90         free(info->author_email);
  91         free(info->committer);
  92         free(info->committer_email);
  93         free(info->subject);
  94         free(info->msg);
  95         free(info->msg_encoding);
  96         free(info);
  97         return NULL;
  98 }
  99
 100 char *trim_end(const char *str, char c)
 101 {
 102         int len;
 103         char *s, *t;
 104
 105         if (str == NULL)
 106                 return NULL;
 107         t = (char *)str;
 108         len = strlen(t);
 109         while(len > 0 && t[len - 1] == c)
 110                 len--;
 111
 112         if (len == 0)
 113                 return NULL;
 114
 115         c = t[len];
 116         t[len] = '\0';
 117         s = xstrdup(t);
 118         t[len] = c;
 119         return s;
 120 }
 121
 122 char *strlpart(char *txt, int maxlen)
 123 {
 124         char *result;
 125
 126         if (!txt)
 127                 return txt;
 128
 129         if (strlen(txt) <= maxlen)
 130                 return txt;
 131         result = xmalloc(maxlen + 1);
 132         memcpy(result, txt, maxlen - 3);
 133         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 134         result[maxlen] = '\0';
 135         return result;
 136 }
 137
 138 char *strrpart(char *txt, int maxlen)
 139 {
 140         char *result;
 141
 142         if (!txt)
 143                 return txt;
 144
 145         if (strlen(txt) <= maxlen)
 146                 return txt;
 147         result = xmalloc(maxlen + 1);
 148         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 149         result[0] = result[1] = result[2] = '.';
 150         return result;
 151 }
 152
 153 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 154 {
 155         size_t size;
 156
 157         if (list->count >= list->alloc) {
 158                 list->alloc += (list->alloc ? list->alloc : 4);
 159                 size = list->alloc * sizeof(struct refinfo *);
 160                 list->refs = xrealloc(list->refs, size);
 161         }
 162         list->refs[list->count++] = ref;
 163 }
 164
 165 struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
 166 {
 167         struct refinfo *ref;
 168
 169         ref = xmalloc(sizeof (struct refinfo));
 170         ref->refname = xstrdup(refname);
 171         ref->object = parse_object(sha1);
 172         switch (ref->object->type) {
 173         case OBJ_TAG:
 174                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 175                 break;
 176         case OBJ_COMMIT:
 177                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 178                 break;
 179         }
 180         return ref;
 181 }
 182
 183 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 184                   void *cb_data)
 185 {
 186         struct reflist *list = (struct reflist *)cb_data;
 187         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 188
 189         if (info)
 190                 cgit_add_ref(list, info);
 191         return 0;
 192 }
 193
 194 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 195                        struct diff_options *options, void *data)
 196 {
 197         int i;
 198
 199         for (i = 0; i < q->nr; i++) {
 200                 if (q->queue[i]->status == 'U')
 201                         continue;
 202                 ((filepair_fn)data)(q->queue[i]);
 203         }
 204 }
 205
 206 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 207 {
 208         enum object_type type;
 209
 210         if (is_null_sha1(sha1)) {
 211                 file->ptr = (char *)"";
 212                 file->size = 0;
 213         } else {
 214                 file->ptr = read_sha1_file(sha1, &type,
 215                                            (unsigned long *)&file->size);
 216         }
 217         return 1;
 218 }
 219
 220 /*
 221  * Receive diff-buffers from xdiff and concatenate them as
 222  * needed across multiple callbacks.
 223  *
 224  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 225  * ripped from git and modified to use globals instead of
 226  * a special callback-struct.
 227  */
 228 char *diffbuf = NULL;
 229 int buflen = 0;
 230
 231 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 232 {
 233         int i;
 234
 235         for (i = 0; i < nbuf; i++) {
 236                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 237                         /* Incomplete line */
 238                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 239                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 240                         buflen += mb[i].size;
 241                         continue;
 242                 }
 243
 244                 /* we have a complete line */
 245                 if (!diffbuf) {
 246                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 247                         continue;
 248                 }
 249                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 250                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 251                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 252                 free(diffbuf);
 253                 diffbuf = NULL;
 254                 buflen = 0;
 255         }
 256         if (diffbuf) {
 257                 ((linediff_fn)priv)(diffbuf, buflen);
 258                 free(diffbuf);
 259                 diffbuf = NULL;
 260                 buflen = 0;
 261         }
 262         return 0;
 263 }
 264
 265 int cgit_diff_files(const unsigned char *old_sha1,
 266                     const unsigned char *new_sha1, unsigned long *old_size,
 267                     unsigned long *new_size, int *binary, linediff_fn fn)
 268 {
 269         mmfile_t file1, file2;
 270         xpparam_t diff_params;
 271         xdemitconf_t emit_params;
 272         xdemitcb_t emit_cb;
 273
 274         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 275                 return 1;
 276
 277         *old_size = file1.size;
 278         *new_size = file2.size;
 279
 280         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 281             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 282                 *binary = 1;
 283                 return 0;
 284         }
 285
 286         memset(&diff_params, 0, sizeof(diff_params));
 287         memset(&emit_params, 0, sizeof(emit_params));
 288         memset(&emit_cb, 0, sizeof(emit_cb));
 289         diff_params.flags = XDF_NEED_MINIMAL;
 290         emit_params.ctxlen = 3;
 291         emit_params.flags = XDL_EMIT_FUNCNAMES;
 292         emit_cb.outf = filediff_cb;
 293         emit_cb.priv = fn;
 294         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 295         return 0;
 296 }
 297
 298 void cgit_diff_tree(const unsigned char *old_sha1,
 299                     const unsigned char *new_sha1,
 300                     filepair_fn fn, const char *prefix)
 301 {
 302         struct diff_options opt;
 303         int ret;
 304         int prefixlen;
 305
 306         diff_setup(&opt);
 307         opt.output_format = DIFF_FORMAT_CALLBACK;
 308         opt.detect_rename = 1;
 309         opt.rename_limit = ctx.cfg.renamelimit;
 310         DIFF_OPT_SET(&opt, RECURSIVE);
 311         opt.format_callback = cgit_diff_tree_cb;
 312         opt.format_callback_data = fn;
 313         if (prefix) {
 314                 opt.nr_paths = 1;
 315                 opt.paths = &prefix;
 316                 prefixlen = strlen(prefix);
 317                 opt.pathlens = &prefixlen;
 318         }
 319         diff_setup_done(&opt);
 320
 321         if (old_sha1 && !is_null_sha1(old_sha1))
 322                 ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 323         else
 324                 ret = diff_root_tree_sha1(new_sha1, "", &opt);
 325         diffcore_std(&opt);
 326         diff_flush(&opt);
 327 }
 328
 329 void cgit_diff_commit(struct commit *commit, filepair_fn fn)
 330 {
 331         unsigned char *old_sha1 = NULL;
 332
 333         if (commit->parents)
 334                 old_sha1 = commit->parents->item->object.sha1;
 335         cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL);
 336 }
 337
 338 int cgit_parse_snapshots_mask(const char *str)
 339 {
 340         const struct cgit_snapshot_format *f;
 341         static const char *delim = " \t,:/|;";
 342         int tl, sl, rv = 0;
 343
 344         /* favor legacy setting */
 345         if(atoi(str))
 346                 return 1;
 347         for(;;) {
 348                 str += strspn(str,delim);
 349                 tl = strcspn(str,delim);
 350                 if (!tl)
 351                         break;
 352                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 353                         sl = strlen(f->suffix);
 354                         if((tl == sl && !strncmp(f->suffix, str, tl)) ||
 355                            (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
 356                                 rv |= f->bit;
 357                                 break;
 358                         }
 359                 }
 360                 str += tl;
 361         }
 362         return rv;
 363 }
 364
 365 int cgit_open_filter(struct cgit_filter *filter)
 366 {
 367
 368         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
 369                 "Unable to duplicate STDOUT");
 370         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
 371         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
 372         if (filter->pid == 0) {
 373                 close(filter->pipe_fh[1]);
 374                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
 375                         "Unable to use pipe as STDIN");
 376                 execvp(filter->cmd, filter->argv);
 377                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
 378                         strerror(errno), errno);
 379         }
 380         close(filter->pipe_fh[0]);
 381         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
 382                 "Unable to use pipe as STDOUT");
 383         close(filter->pipe_fh[1]);
 384         return 0;
 385 }
 386
 387 int cgit_close_filter(struct cgit_filter *filter)
 388 {
 389         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
 390                 "Unable to restore STDOUT");
 391         close(filter->old_stdout);
 392         if (filter->pid < 0)
 393                 return 0;
 394         waitpid(filter->pid, &filter->exitstatus, 0);
 395         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
 396                 return 0;
 397         die("Subprocess %s exited abnormally", filter->cmd);
 398 }
 399
 400 /* Read the content of the specified file into a newly allocated buffer,
 401  * zeroterminate the buffer and return 0 on success, errno otherwise.
 402  */
 403 int readfile(const char *path, char **buf, size_t *size)
 404 {
 405         int fd, e;
 406         struct stat st;
 407
 408         fd = open(path, O_RDONLY);
 409         if (fd == -1)
 410                 return errno;
 411         if (fstat(fd, &st)) {
 412                 e = errno;
 413                 close(fd);
 414                 return e;
 415         }
 416         if (!S_ISREG(st.st_mode)) {
 417                 close(fd);
 418                 return EISDIR;
 419         }
 420         *buf = xmalloc(st.st_size + 1);
 421         *size = read_in_full(fd, *buf, st.st_size);
 422         e = errno;
 423         (*buf)[*size] = '\0';
 424         close(fd);
 425         return (*size == st.st_size ? 0 : e);
 426 }