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 1.19 2006/11/07 06:57:02 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 generate_forwarding_headers(void);
  74 static void usage(void);
  75
  76 /*
  77  * Config builds a set of files for building a UNIX
  78  * system given a description of the desired system.
  79  */
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         struct stat buf;
  84         int ch, len;
  85         unsigned int i;
  86         char *p;
  87         char linksrc[64], linkdest[MAXPATHLEN];
  88         static const char *emus[] = { "linux" };
  89
  90         while ((ch = getopt(argc, argv, "d:gprn")) != -1)
  91                 switch (ch) {
  92                 case 'd':
  93                         if (*destdir == '\0')
  94                                 strlcpy(destdir, optarg, sizeof(destdir));
  95                         else
  96                                 errx(2, "directory already set");
  97                         break;
  98                 case 'g':
  99                         debugging++;
 100                         break;
 101                 case 'p':
 102                         profiling++;
 103                         break;
 104                 case 'n':
 105                         /* no_config_clobber is now true by default, no-op */
 106                         fprintf(stderr,
 107                                 "*** Using obsolete config option '-n' ***\n");
 108                         break;
 109                 case 'r':
 110                         no_config_clobber = FALSE;
 111                         break;
 112                 case '?':
 113                 default:
 114                         usage();
 115                 }
 116         argc -= optind;
 117         argv += optind;
 118
 119         if (argc != 1)
 120                 usage();
 121
 122         if (freopen(PREFIX = *argv, "r", stdin) == NULL)
 123                 err(2, "%s", PREFIX);
 124
 125         if (*destdir != '\0') {
 126                 len = strlen(destdir);
 127                 while (len > 1 && destdir[len - 1] == '/')
 128                         destdir[--len] = '\0';
 129                 get_srcdir();
 130         } else {
 131                 strlcpy(destdir, CDIR, sizeof(destdir));
 132                 strlcat(destdir, PREFIX, sizeof(destdir));
 133         }
 134
 135         p = path((char *)NULL);
 136         if (stat(p, &buf)) {
 137                 if (mkdir(p, 0777))
 138                         err(2, "%s", p);
 139         }
 140         else if ((buf.st_mode & S_IFMT) != S_IFDIR) {
 141                 errx(2, "%s isn't a directory", p);
 142         }
 143         else if (!no_config_clobber) {
 144                 char tmp[strlen(p) + 8];
 145
 146                 fprintf(stderr, "Removing old directory %s:  ", p);
 147                 fflush(stderr);
 148                 snprintf(tmp, sizeof(tmp), "rm -rf %s", p);
 149                 if (system(tmp)) {
 150                         fprintf(stderr, "Failed!\n");
 151                         err(2, "%s", tmp);
 152                 }
 153                 fprintf(stderr, "Done.\n");
 154                 if (mkdir(p, 0777))
 155                         err(2, "%s", p);
 156         }
 157
 158         dtab = NULL;
 159         if (yyparse())
 160                 exit(3);
 161         if (machinename == NULL) {
 162                 printf("Specify platform architecture, e.g. 'machine pc32'\n");
 163                 exit(1);
 164         }
 165         if (machinearchname == NULL) {
 166                 printf("Specify cpu architecture, e.g. 'machine_arch i386'\n");
 167                 exit(1);
 168         }
 169         newbus_ioconf();
 170
 171         /*
 172          * "machine" points into machine/<MACHINE>/include
 173          */
 174         if (*srcdir == '\0')
 175                 snprintf(linkdest, sizeof(linkdest), "../../machine/%s/include",
 176                     machinename);
 177         else
 178                 snprintf(linkdest, sizeof(linkdest), "%s/machine/%s/include",
 179                     srcdir, machinename);
 180         symlink(linkdest, path("machine"));
 181
 182         /*
 183          * "machine_base" points into machine/<MACHINE>
 184          */
 185         if (*srcdir == '\0')
 186                 snprintf(linkdest, sizeof(linkdest), "../../machine/%s",
 187                     machinename);
 188         else
 189                 snprintf(linkdest, sizeof(linkdest), "%s/machine/%s",
 190                     srcdir, machinename);
 191         symlink(linkdest, path("machine_base"));
 192
 193         /*
 194          * "cpu" points to cpu/<MACHINE_ARCH>/include
 195          */
 196         if (*srcdir == '\0')
 197                 snprintf(linkdest, sizeof(linkdest),
 198                          "../../cpu/%s/include", machinearchname);
 199         else
 200                 snprintf(linkdest, sizeof(linkdest),
 201                          "%s/cpu/%s/include", srcdir, machinearchname);
 202         symlink(linkdest, path("cpu"));
 203
 204         /*
 205          * "cpu_base" points to cpu/<MACHINE_ARCH>
 206          */
 207         if (*srcdir == '\0')
 208                 snprintf(linkdest, sizeof(linkdest), "../../cpu/%s",
 209                     machinearchname);
 210         else
 211                 snprintf(linkdest, sizeof(linkdest), "%s/cpu/%s",
 212                     srcdir, machinearchname);
 213         symlink(linkdest, path("cpu_base"));
 214
 215         /*
 216          * Create include/machine, in which we place forwarding header files
 217          * for headers that exist in the cpu architecture but have not been
 218          * overridden in the platform architecture.
 219          */
 220         mkdir(path("include"), 0755);
 221         mkdir(path("include/machine"), 0755);
 222         generate_forwarding_headers();
 223
 224         /*
 225          * XXX check directory structure for architecture subdirectories and
 226          * create the symlinks automatically XXX
 227          */
 228         if (*srcdir == '\0')
 229                 snprintf(linkdest, sizeof(linkdest),
 230                     "../../../../../net/i4b/include/%s",
 231                     machinearchname);
 232         else
 233                 snprintf(linkdest, sizeof(linkdest), "%s/net/i4b/include/%s",
 234                     srcdir, machinearchname);
 235         mkdir(path("net"), 0755);
 236         mkdir(path("net/i4b"), 0755);
 237         mkdir(path("net/i4b/include"), 0755);
 238         symlink(linkdest, path("net/i4b/include/machine"));
 239
 240         for (i = 0; i < sizeof(emus) / sizeof(emus[0]); ++i) {
 241                 if (*srcdir == 0)  {
 242                         snprintf(linkdest, sizeof(linkdest),
 243                             "../../emulation/%s/%s",
 244                             emus[i], machinearchname);
 245                 } else {
 246                         snprintf(linkdest, sizeof(linkdest),
 247                             "%s/emulation/%s/%s",
 248                             srcdir, emus[i], machinearchname);
 249                 }
 250                 snprintf(linksrc, sizeof(linksrc), "arch_%s", emus[i]);
 251                 symlink(linkdest, path(linksrc));
 252         }
 253
 254         options();                      /* make options .h files */
 255         makefile();                     /* build Makefile */
 256         headers();                      /* make a lot of .h files */
 257         configfile();                   /* put config file into kernel*/
 258         printf("Kernel build directory is %s\n", p);
 259         exit(EX_OK);
 260 }
 261
 262 /*
 263  * get_srcdir
 264  *      determine the root of the kernel source tree
 265  *      and save that in srcdir.
 266  */
 267 static void
 268 get_srcdir(void)
 269 {
 270
 271         if (realpath("..", srcdir) == NULL)
 272                 errx(2, "Unable to find root of source tree");
 273 }
 274
 275 static void
 276 usage(void)
 277 {
 278
 279         fprintf(stderr, "usage: config [-gpr] [-d destdir] sysname\n");
 280         exit(1);
 281 }
 282
 283 /*
 284  * get_word
 285  *      returns EOF on end of file
 286  *      NULL on end of line
 287  *      pointer to the word otherwise
 288  */
 289 char *
 290 get_word(FILE *fp)
 291 {
 292         static char line[80];
 293         int ch;
 294         char *cp;
 295         int escaped_nl = 0;
 296
 297 begin:
 298         while ((ch = getc(fp)) != EOF)
 299                 if (ch != ' ' && ch != '\t')
 300                         break;
 301         if (ch == EOF)
 302                 return((char *)EOF);
 303         if (ch == '\\') {
 304                 escaped_nl = 1;
 305                 goto begin;
 306         }
 307         if (ch == '\n') {
 308                 if (escaped_nl) {
 309                         escaped_nl = 0;
 310                         goto begin;
 311                 }
 312                 else
 313                         return(NULL);
 314         }
 315         cp = line;
 316         *cp++ = ch;
 317         while ((ch = getc(fp)) != EOF) {
 318                 if (isspace(ch))
 319                         break;
 320                 *cp++ = ch;
 321         }
 322         *cp = 0;
 323         if (ch == EOF)
 324                 return((char *)EOF);
 325         ungetc(ch, fp);
 326         return(line);
 327 }
 328
 329 /*
 330  * get_quoted_word
 331  *      like get_word but will accept something in double or single quotes
 332  *      (to allow embedded spaces).
 333  */
 334 char *
 335 get_quoted_word(FILE *fp)
 336 {
 337         static char line[256];
 338         int ch;
 339         char *cp;
 340         int escaped_nl = 0;
 341
 342 begin:
 343         while ((ch = getc(fp)) != EOF)
 344                 if (ch != ' ' && ch != '\t')
 345                         break;
 346         if (ch == EOF)
 347                 return((char *)EOF);
 348         if (ch == '\\') {
 349                 escaped_nl = 1;
 350                 goto begin;
 351         }
 352         if (ch == '\n') {
 353                 if (escaped_nl) {
 354                         escaped_nl = 0;
 355                         goto begin;
 356                 }
 357                 else
 358                         return(NULL);
 359         }
 360         cp = line;
 361         if (ch == '"' || ch == '\'') {
 362                 int quote = ch;
 363
 364                 while ((ch = getc(fp)) != EOF) {
 365                         if (ch == quote)
 366                                 break;
 367                         if (ch == '\n') {
 368                                 *cp = 0;
 369                                 printf("config: missing quote reading `%s'\n",
 370                                         line);
 371                                 exit(2);
 372                         }
 373                         *cp++ = ch;
 374                 }
 375         } else {
 376                 *cp++ = ch;
 377                 while ((ch = getc(fp)) != EOF) {
 378                         if (isspace(ch))
 379                                 break;
 380                         *cp++ = ch;
 381                 }
 382                 if (ch != EOF)
 383                         ungetc(ch, fp);
 384         }
 385         *cp = 0;
 386         if (ch == EOF)
 387                 return((char *)EOF);
 388         return(line);
 389 }
 390
 391 /*
 392  * prepend the path to a filename
 393  */
 394 char *
 395 path(const char *file)
 396 {
 397         char *cp;
 398
 399         cp = malloc((size_t)(strlen(destdir) + (file ? strlen(file) : 0) + 2));
 400         strcpy(cp, destdir);
 401         if (file != NULL) {
 402                 strcat(cp, "/");
 403                 strcat(cp, file);
 404         }
 405         return(cp);
 406 }
 407
 408 static void
 409 configfile(void)
 410 {
 411         FILE *fi, *fo;
 412         char *p;
 413         int i;
 414
 415         fi = fopen(PREFIX, "r");
 416         if (fi == NULL)
 417                 err(2, "%s", PREFIX);
 418         fo = fopen(p = path("config.c.new"), "w");
 419         if (fo == NULL)
 420                 err(2, "%s", p);
 421         fprintf(fo, "#include \"opt_config.h\"\n");
 422         fprintf(fo, "#ifdef INCLUDE_CONFIG_FILE \n");
 423         fprintf(fo, "static const char config[] = \"\\\n");
 424         fprintf(fo, "START CONFIG FILE %s\\n\\\n___", PREFIX);
 425         while (EOF != (i = getc(fi))) {
 426                 if (i == '\n') {
 427                         fprintf(fo, "\\n\\\n___");
 428                 } else if (i == '\"') {
 429                         fprintf(fo, "\\\"");
 430                 } else if (i == '\\') {
 431                         fprintf(fo, "\\\\");
 432                 } else {
 433                         putc(i, fo);
 434                 }
 435         }
 436         fprintf(fo, "\\n\\\nEND CONFIG FILE %s\\n\\\n", PREFIX);
 437         fprintf(fo, "\";\n");
 438         fprintf(fo, "\n#endif /* INCLUDE_CONFIG_FILE */\n");
 439         fclose(fi);
 440         fclose(fo);
 441         moveifchanged(path("config.c.new"), path("config.c"));
 442 }
 443
 444 /*
 445  * moveifchanged --
 446  *      compare two files; rename if changed.
 447  */
 448 void
 449 moveifchanged(const char *from_name, const char *to_name)
 450 {
 451         char *p, *q;
 452         int changed;
 453         size_t tsize;
 454         struct stat from_sb, to_sb;
 455         int from_fd, to_fd;
 456
 457         changed = 0;
 458
 459         if ((from_fd = open(from_name, O_RDONLY)) < 0)
 460                 err(EX_OSERR, "moveifchanged open(%s)", from_name);
 461
 462         if ((to_fd = open(to_name, O_RDONLY)) < 0)
 463                 changed++;
 464
 465         if (!changed && fstat(from_fd, &from_sb) < 0)
 466                 err(EX_OSERR, "moveifchanged fstat(%s)", from_name);
 467
 468         if (!changed && fstat(to_fd, &to_sb) < 0)
 469                 err(EX_OSERR, "moveifchanged fstat(%s)", to_name);
 470
 471         if (!changed && from_sb.st_size != to_sb.st_size)
 472                 changed++;
 473
 474         tsize = (size_t)from_sb.st_size;
 475
 476         if (!changed) {
 477                 p = mmap(NULL, tsize, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 478 #ifndef MAP_FAILED
 479 #define MAP_FAILED ((caddr_t)-1)
 480 #endif
 481                 if (p == MAP_FAILED)
 482                         err(EX_OSERR, "mmap %s", from_name);
 483                 q = mmap(NULL, tsize, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 484                 if (q == MAP_FAILED)
 485                         err(EX_OSERR, "mmap %s", to_name);
 486
 487                 changed = memcmp(p, q, tsize);
 488                 munmap(p, tsize);
 489                 munmap(q, tsize);
 490         }
 491         if (changed) {
 492                 if (rename(from_name, to_name) < 0)
 493                         err(EX_OSERR, "rename(%s, %s)", from_name, to_name);
 494         } else {
 495                 if (unlink(from_name) < 0)
 496                         err(EX_OSERR, "unlink(%s)", from_name);
 497         }
 498 }
 499
 500 static
 501 void
 502 generate_forwarding_headers(void)
 503 {
 504         char buf[MAXPATHLEN];
 505         char upper[256];
 506         char *ptr;
 507         struct dirent *den;
 508         DIR *dir;
 509         FILE *fp;
 510
 511         if (*srcdir == '\0')
 512                 snprintf(buf, sizeof(buf), "../../cpu/%s/include",
 513                     machinearchname);
 514         else
 515                 snprintf(buf, sizeof(buf), "%s/cpu/%s/include",
 516                     srcdir, machinearchname);
 517
 518         if ((dir = opendir(buf)) != NULL) {
 519                 while ((den = readdir(dir)) != NULL) {
 520                         if (den->d_name[0] == '.')
 521                                 continue;
 522
 523                         /*
 524                          * Is this a header file?
 525                          */
 526                         snprintf(upper, sizeof(upper), "%s", den->d_name);
 527                         ptr = strrchr(upper, '.');
 528                         if (ptr == NULL || strcmp(ptr, ".h") != 0)
 529                                 continue;
 530
 531                         /*
 532                          * Generate an upper case symbol
 533                          */
 534                         *ptr = 0;
 535                         for (ptr = upper; *ptr; ++ptr) {
 536                             if (*ptr == '.')
 537                                 *ptr = '_';
 538                             else if (islower(*ptr))
 539                                 *ptr = toupper(*ptr);
 540                         }
 541
 542                         /*
 543                          * Generate a forwarding header file
 544                          */
 545                         snprintf(buf, sizeof(buf), "%s/%s",
 546                                 path("include/machine"), den->d_name);
 547                         fp = fopen(buf, "w");
 548                         fprintf(fp, "/*\n"
 549                                     " * CONFIG-GENERATED FILE, DO NOT EDIT\n"
 550                                     " */\n"
 551                                     "\n"
 552                                     "#ifndef _MACHINE_%s_H_\n"
 553                                     "#define _MACHINE_%s_H_\n"
 554                                     "#include <cpu/%s>\n"
 555                                     "#endif\n"
 556                                     "\n",
 557                                     upper,
 558                                     upper,
 559                                     den->d_name
 560                         );
 561                         fclose(fp);
 562                 }
 563                 closedir(dir);
 564         }
 565 }
 566