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