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