usr.sbin/config/main.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)main.c   8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.sbin/config/main.c,v 1.37.2.3 2001/06/13 00:25:53 cg Exp $
  36  * $DragonFly: src/usr.sbin/config/main.c,v 1.21 2007/01/19 07:23:43 dillon Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <sys/file.h>
  42 #include <sys/mman.h>
  43 #include <sys/param.h>
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <stdio.h>
  47 #include <dirent.h>
  48 #include <sysexits.h>
  49 #include <unistd.h>
  50 #include "y.tab.h"
  51 #include "config.h"
  52
  53 #ifndef TRUE
  54 #define TRUE    (1)
  55 #endif
  56
  57 #ifndef FALSE
  58 #define FALSE   (0)
  59 #endif
  60
  61 #define CDIR    "../compile/"
  62
  63 char *  PREFIX;
  64 char    destdir[MAXPATHLEN];
  65 char    srcdir[MAXPATHLEN];
  66
  67 static int no_config_clobber = TRUE;
  68 int     debugging;
  69 int     profiling;
  70
  71 static void configfile(void);
  72 static void get_srcdir(void);
  73 static void usage(void);
  74
  75 /*
  76  * Config builds a set of files for building a UNIX
  77  * system given a description of the desired system.
  78  */
  79 int
  80 main(int argc, char *argv[])
  81 {
  82         struct stat buf;
  83         int ch, len;
  84         unsigned int i;
  85         char *p;
  86         char linksrc[64], linkdest[MAXPATHLEN];
  87         static const char *emus[] = { "linux" };
  88
  89         while ((ch = getopt(argc, argv, "d:gprn")) != -1)
  90                 switch (ch) {
  91                 case 'd':
  92                         if (*destdir == '\0')
  93                                 strlcpy(destdir, optarg, sizeof(destdir));
  94                         else
  95                                 errx(2, "directory already set");
  96                         break;
  97                 case 'g':
  98                         debugging++;
  99                         break;
 100                 case 'p':
 101                         profiling++;
 102                         break;
 103                 case 'n':
 104                         /* no_config_clobber is now true by default, no-op */
 105                         fprintf(stderr,
 106                                 "*** Using obsolete config option '-n' ***\n");
 107                         break;
 108                 case 'r':
 109                         no_config_clobber = FALSE;
 110                         break;
 111                 case '?':
 112                 default:
 113                         usage();
 114                 }
 115         argc -= optind;
 116         argv += optind;
 117
 118         if (argc != 1)
 119                 usage();
 120
 121         if (freopen(PREFIX = *argv, "r", stdin) == NULL)
 122                 err(2, "%s", PREFIX);
 123
 124         if (*destdir != '\0') {
 125                 len = strlen(destdir);
 126                 while (len > 1 && destdir[len - 1] == '/')
 127                         destdir[--len] = '\0';
 128                 get_srcdir();
 129         } else {
 130                 strlcpy(destdir, CDIR, sizeof(destdir));
 131                 strlcat(destdir, PREFIX, sizeof(destdir));
 132         }
 133
 134         p = path((char *)NULL);
 135         if (stat(p, &buf)) {
 136                 if (mkdir(p, 0777))
 137                         err(2, "%s", p);
 138         }
 139         else if ((buf.st_mode & S_IFMT) != S_IFDIR) {
 140                 errx(2, "%s isn't a directory", p);
 141         }
 142         else if (!no_config_clobber) {
 143                 char tmp[strlen(p) + 8];
 144
 145                 fprintf(stderr, "Removing old directory %s:  ", p);
 146                 fflush(stderr);
 147                 snprintf(tmp, sizeof(tmp), "rm -rf %s", p);
 148                 if (system(tmp)) {
 149                         fprintf(stderr, "Failed!\n");
 150                         err(2, "%s", tmp);
 151                 }
 152                 fprintf(stderr, "Done.\n");
 153                 if (mkdir(p, 0777))
 154                         err(2, "%s", p);
 155         }
 156
 157         dtab = NULL;
 158         if (yyparse())
 159                 exit(3);
 160         if (platformname == NULL) {
 161                 printf("Specify platform architecture, e.g. 'platform pc32'\n");
 162                 exit(1);
 163         }
 164         if (machinename == NULL) {
 165                 printf("Specify machine architecture, e.g. 'machine i386'\n");
 166                 exit(1);
 167         }
 168         if (machinearchname == NULL) {
 169                 printf("Specify cpu architecture, e.g. 'machine_arch i386'\n");
 170                 exit(1);
 171         }
 172         newbus_ioconf();
 173
 174         /*
 175          * "machine" points into platform/<PLATFORM>/include
 176          */
 177         if (*srcdir == '\0')
 178                 snprintf(linkdest, sizeof(linkdest), "../../platform/%s/include",
 179                     platformname);
 180         else
 181                 snprintf(linkdest, sizeof(linkdest), "%s/platform/%s/include",
 182                     srcdir, platformname);
 183         symlink(linkdest, path("machine"));
 184
 185         /*
 186          * "machine_base" points into platform/<PLATFORM>
 187          */
 188         if (*srcdir == '\0')
 189                 snprintf(linkdest, sizeof(linkdest), "../../platform/%s",
 190                     platformname);
 191         else
 192                 snprintf(linkdest, sizeof(linkdest), "%s/platform/%s",
 193                     srcdir, platformname);
 194         symlink(linkdest, path("machine_base"));
 195
 196         /*
 197          * "cpu" points to cpu/<MACHINE_ARCH>/include
 198          */
 199         if (*srcdir == '\0')
 200                 snprintf(linkdest, sizeof(linkdest),
 201                          "../../cpu/%s/include", machinearchname);
 202         else
 203                 snprintf(linkdest, sizeof(linkdest),
 204                          "%s/cpu/%s/include", srcdir, machinearchname);
 205         symlink(linkdest, path("cpu"));
 206
 207         /*
 208          * "cpu_base" points to cpu/<MACHINE_ARCH>
 209          */
 210         if (*srcdir == '\0')
 211                 snprintf(linkdest, sizeof(linkdest), "../../cpu/%s",
 212                     machinearchname);
 213         else
 214                 snprintf(linkdest, sizeof(linkdest), "%s/cpu/%s",
 215                     srcdir, machinearchname);
 216         symlink(linkdest, path("cpu_base"));
 217
 218         /*
 219          * XXX check directory structure for architecture subdirectories and
 220          * create the symlinks automatically XXX
 221          */
 222         if (*srcdir == '\0')
 223                 snprintf(linkdest, sizeof(linkdest),
 224                     "../../../../../net/i4b/include/%s",
 225                     machinearchname);
 226         else
 227                 snprintf(linkdest, sizeof(linkdest), "%s/net/i4b/include/%s",
 228                     srcdir, machinearchname);
 229         mkdir(path("net"), 0755);
 230         mkdir(path("net/i4b"), 0755);
 231         mkdir(path("net/i4b/include"), 0755);
 232         symlink(linkdest, path("net/i4b/include/machine"));
 233
 234         for (i = 0; i < sizeof(emus) / sizeof(emus[0]); ++i) {
 235                 if (*srcdir == 0)  {
 236                         snprintf(linkdest, sizeof(linkdest),
 237                             "../../emulation/%s/%s",
 238                             emus[i], machinearchname);
 239                 } else {
 240                         snprintf(linkdest, sizeof(linkdest),
 241                             "%s/emulation/%s/%s",
 242                             srcdir, emus[i], machinearchname);
 243                 }
 244                 snprintf(linksrc, sizeof(linksrc), "arch_%s", emus[i]);
 245                 symlink(linkdest, path(linksrc));
 246         }
 247
 248         options();                      /* make options .h files */
 249         makefile();                     /* build Makefile */
 250         headers();                      /* make a lot of .h files */
 251         configfile();                   /* put config file into kernel*/
 252         printf("Kernel build directory is %s\n", p);
 253         exit(EX_OK);
 254 }
 255
 256 /*
 257  * get_srcdir
 258  *      determine the root of the kernel source tree
 259  *      and save that in srcdir.
 260  */
 261 static void
 262 get_srcdir(void)
 263 {
 264
 265         if (realpath("..", srcdir) == NULL)
 266                 errx(2, "Unable to find root of source tree");
 267 }
 268
 269 static void
 270 usage(void)
 271 {
 272
 273         fprintf(stderr, "usage: config [-gpr] [-d destdir] sysname\n");
 274         exit(1);
 275 }
 276
 277 /*
 278  * get_word
 279  *      returns EOF on end of file
 280  *      NULL on end of line
 281  *      pointer to the word otherwise
 282  */
 283 char *
 284 get_word(FILE *fp)
 285 {
 286         static char line[80];
 287         int ch;
 288         char *cp;
 289         int escaped_nl = 0;
 290
 291 begin:
 292         while ((ch = getc(fp)) != EOF)
 293                 if (ch != ' ' && ch != '\t')
 294                         break;
 295         if (ch == EOF)
 296                 return((char *)EOF);
 297         if (ch == '\\') {
 298                 escaped_nl = 1;
 299                 goto begin;
 300         }
 301         if (ch == '\n') {
 302                 if (escaped_nl) {
 303                         escaped_nl = 0;
 304                         goto begin;
 305                 }
 306                 else
 307                         return(NULL);
 308         }
 309         cp = line;
 310         *cp++ = ch;
 311         while ((ch = getc(fp)) != EOF) {
 312                 if (isspace(ch))
 313                         break;
 314                 *cp++ = ch;
 315         }
 316         *cp = 0;
 317         if (ch == EOF)
 318                 return((char *)EOF);
 319         ungetc(ch, fp);
 320         return(line);
 321 }
 322
 323 /*
 324  * get_quoted_word
 325  *      like get_word but will accept something in double or single quotes
 326  *      (to allow embedded spaces).
 327  */
 328 char *
 329 get_quoted_word(FILE *fp)
 330 {
 331         static char line[256];
 332         int ch;
 333         char *cp;
 334         int escaped_nl = 0;
 335
 336 begin:
 337         while ((ch = getc(fp)) != EOF)
 338                 if (ch != ' ' && ch != '\t')
 339                         break;
 340         if (ch == EOF)
 341                 return((char *)EOF);
 342         if (ch == '\\') {
 343                 escaped_nl = 1;
 344                 goto begin;
 345         }
 346         if (ch == '\n') {
 347                 if (escaped_nl) {
 348                         escaped_nl = 0;
 349                         goto begin;
 350                 }
 351                 else
 352                         return(NULL);
 353         }
 354         cp = line;
 355         if (ch == '"' || ch == '\'') {
 356                 int quote = ch;
 357
 358                 while ((ch = getc(fp)) != EOF) {
 359                         if (ch == quote)
 360                                 break;
 361                         if (ch == '\n') {
 362                                 *cp = 0;
 363                                 printf("config: missing quote reading `%s'\n",
 364                                         line);
 365                                 exit(2);
 366                         }
 367                         *cp++ = ch;
 368                 }
 369         } else {
 370                 *cp++ = ch;
 371                 while ((ch = getc(fp)) != EOF) {
 372                         if (isspace(ch))
 373                                 break;
 374                         *cp++ = ch;
 375                 }
 376                 if (ch != EOF)
 377                         ungetc(ch, fp);
 378         }
 379         *cp = 0;
 380         if (ch == EOF)
 381                 return((char *)EOF);
 382         return(line);
 383 }
 384
 385 /*
 386  * prepend the path to a filename
 387  */
 388 char *
 389 path(const char *file)
 390 {
 391         char *cp;
 392
 393         cp = malloc((size_t)(strlen(destdir) + (file ? strlen(file) : 0) + 2));
 394         strcpy(cp, destdir);
 395         if (file != NULL) {
 396                 strcat(cp, "/");
 397                 strcat(cp, file);
 398         }
 399         return(cp);
 400 }
 401
 402 static void
 403 configfile(void)
 404 {
 405         FILE *fi, *fo;
 406         char *p;
 407         int i;
 408
 409         fi = fopen(PREFIX, "r");
 410         if (fi == NULL)
 411                 err(2, "%s", PREFIX);
 412         fo = fopen(p = path("config.c.new"), "w");
 413         if (fo == NULL)
 414                 err(2, "%s", p);
 415         fprintf(fo, "#include \"opt_config.h\"\n");
 416         fprintf(fo, "#ifdef INCLUDE_CONFIG_FILE \n");
 417         fprintf(fo, "static const char config[] = \"\\\n");
 418         fprintf(fo, "START CONFIG FILE %s\\n\\\n___", PREFIX);
 419         while (EOF != (i = getc(fi))) {
 420                 if (i == '\n') {
 421                         fprintf(fo, "\\n\\\n___");
 422                 } else if (i == '\"') {
 423                         fprintf(fo, "\\\"");
 424                 } else if (i == '\\') {
 425                         fprintf(fo, "\\\\");
 426                 } else {
 427                         putc(i, fo);
 428                 }
 429         }
 430         fprintf(fo, "\\n\\\nEND CONFIG FILE %s\\n\\\n", PREFIX);
 431         fprintf(fo, "\";\n");
 432         fprintf(fo, "\n#endif /* INCLUDE_CONFIG_FILE */\n");
 433         fclose(fi);
 434         fclose(fo);
 435         moveifchanged(path("config.c.new"), path("config.c"));
 436 }
 437
 438 /*
 439  * moveifchanged --
 440  *      compare two files; rename if changed.
 441  */
 442 void
 443 moveifchanged(const char *from_name, const char *to_name)
 444 {
 445         char *p, *q;
 446         int changed;
 447         size_t tsize;
 448         struct stat from_sb, to_sb;
 449         int from_fd, to_fd;
 450
 451         changed = 0;
 452
 453         if ((from_fd = open(from_name, O_RDONLY)) < 0)
 454                 err(EX_OSERR, "moveifchanged open(%s)", from_name);
 455
 456         if ((to_fd = open(to_name, O_RDONLY)) < 0)
 457                 changed++;
 458
 459         if (!changed && fstat(from_fd, &from_sb) < 0)
 460                 err(EX_OSERR, "moveifchanged fstat(%s)", from_name);
 461
 462         if (!changed && fstat(to_fd, &to_sb) < 0)
 463                 err(EX_OSERR, "moveifchanged fstat(%s)", to_name);
 464
 465         if (!changed && from_sb.st_size != to_sb.st_size)
 466                 changed++;
 467
 468         tsize = (size_t)from_sb.st_size;
 469
 470         if (!changed) {
 471                 p = mmap(NULL, tsize, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 472 #ifndef MAP_FAILED
 473 #define MAP_FAILED ((caddr_t)-1)
 474 #endif
 475                 if (p == MAP_FAILED)
 476                         err(EX_OSERR, "mmap %s", from_name);
 477                 q = mmap(NULL, tsize, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 478                 if (q == MAP_FAILED)
 479                         err(EX_OSERR, "mmap %s", to_name);
 480
 481                 changed = memcmp(p, q, tsize);
 482                 munmap(p, tsize);
 483                 munmap(q, tsize);
 484         }
 485         if (changed) {
 486                 if (rename(from_name, to_name) < 0)
 487                         err(EX_OSERR, "rename(%s, %s)", from_name, to_name);
 488         } else {
 489                 if (unlink(from_name) < 0)
 490                         err(EX_OSERR, "unlink(%s)", from_name);
 491         }
 492 }