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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)main.c   8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.sbin/config/main.c,v 1.37.2.3 2001/06/13 00:25:53 cg Exp $
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <sys/file.h>
  37 #include <sys/mman.h>
  38 #include <sys/param.h>
  39 #include <ctype.h>
  40 #include <err.h>
  41 #include <stdio.h>
  42 #include <dirent.h>
  43 #include <sysexits.h>
  44 #include <unistd.h>
  45 #include "y.tab.h"
  46 #include "config.h"
  47
  48 #ifndef TRUE
  49 #define TRUE    (1)
  50 #endif
  51
  52 #ifndef FALSE
  53 #define FALSE   (0)
  54 #endif
  55
  56 #define CDIR    "../compile/"
  57
  58 char *  PREFIX;
  59 char    destdir[MAXPATHLEN];
  60 char    srcdir[MAXPATHLEN];
  61
  62 static int no_config_clobber = TRUE;
  63 int     debugging;
  64 int     profiling;
  65
  66 extern int yyparse(void);
  67 static void configfile(void);
  68 static void get_srcdir(void);
  69 static void usage(void);
  70
  71 /*
  72  * Config builds a set of files for building a UNIX
  73  * system given a description of the desired system.
  74  */
  75 int
  76 main(int argc, char *argv[])
  77 {
  78         struct stat buf;
  79         int ch, len;
  80         char *p;
  81         char linkdest[MAXPATHLEN];
  82 #if 0
  83         unsigned int i;
  84         char linksrc[64];
  85         static const char *emus[] = { "linux" };
  86 #endif
  87
  88         while ((ch = getopt(argc, argv, "d:gpr")) != -1)
  89                 switch (ch) {
  90                 case 'd':
  91                         if (*destdir == '\0')
  92                                 strlcpy(destdir, optarg, sizeof(destdir));
  93                         else
  94                                 errx(2, "directory already set");
  95                         break;
  96                 case 'g':
  97                         debugging++;
  98                         break;
  99                 case 'p':
 100                         profiling++;
 101                         break;
 102                 case 'r':
 103                         no_config_clobber = FALSE;
 104                         break;
 105                 case '?':
 106                 default:
 107                         usage();
 108                 }
 109         argc -= optind;
 110         argv += optind;
 111
 112         if (argc != 1)
 113                 usage();
 114
 115         if (freopen(PREFIX = *argv, "r", stdin) == NULL)
 116                 err(2, "%s", PREFIX);
 117
 118         if (*destdir != '\0') {
 119                 len = strlen(destdir);
 120                 while (len > 1 && destdir[len - 1] == '/')
 121                         destdir[--len] = '\0';
 122                 get_srcdir();
 123         } else {
 124                 strlcpy(destdir, CDIR, sizeof(destdir));
 125                 strlcat(destdir, PREFIX, sizeof(destdir));
 126         }
 127
 128         p = path(NULL);
 129         if (stat(p, &buf)) {
 130                 if (mkdir(p, 0777))
 131                         err(2, "%s", p);
 132         }
 133         else if ((buf.st_mode & S_IFMT) != S_IFDIR) {
 134                 errx(2, "%s isn't a directory", p);
 135         }
 136         else if (!no_config_clobber) {
 137                 char tmp[strlen(p) + 8];
 138
 139                 fprintf(stderr, "Removing old directory %s:  ", p);
 140                 fflush(stderr);
 141                 snprintf(tmp, sizeof(tmp), "rm -rf %s", p);
 142                 if (system(tmp)) {
 143                         fprintf(stderr, "Failed!\n");
 144                         err(2, "%s", tmp);
 145                 }
 146                 fprintf(stderr, "Done.\n");
 147                 if (mkdir(p, 0777))
 148                         err(2, "%s", p);
 149         }
 150
 151         dtab = NULL;
 152         if (yyparse())
 153                 exit(3);
 154         if (platformname == NULL) {
 155                 printf("Specify platform architecture, e.g. 'platform pc64'\n");
 156                 exit(1);
 157         }
 158         if (machinename == NULL) {
 159                 printf("Specify machine architecture, e.g. 'machine x86_64'\n");
 160                 exit(1);
 161         }
 162         if (machinearchname == NULL) {
 163                 printf("Specify cpu architecture, e.g. 'machine_arch x86_64'\n");
 164                 exit(1);
 165         }
 166         newbus_ioconf();
 167
 168         /*
 169          * "machine" points into platform/<PLATFORM>/include
 170          */
 171         if (*srcdir == '\0')
 172                 snprintf(linkdest, sizeof(linkdest), "../../platform/%s/include",
 173                     platformname);
 174         else
 175                 snprintf(linkdest, sizeof(linkdest), "%s/platform/%s/include",
 176                     srcdir, platformname);
 177         symlink(linkdest, path("machine"));
 178
 179         /*
 180          * "machine_base" points into platform/<PLATFORM>
 181          */
 182         if (*srcdir == '\0')
 183                 snprintf(linkdest, sizeof(linkdest), "../../platform/%s",
 184                     platformname);
 185         else
 186                 snprintf(linkdest, sizeof(linkdest), "%s/platform/%s",
 187                     srcdir, platformname);
 188         symlink(linkdest, path("machine_base"));
 189
 190         /*
 191          * "cpu" points to cpu/<MACHINE_ARCH>/include
 192          */
 193         if (*srcdir == '\0')
 194                 snprintf(linkdest, sizeof(linkdest),
 195                          "../../cpu/%s/include", machinearchname);
 196         else
 197                 snprintf(linkdest, sizeof(linkdest),
 198                          "%s/cpu/%s/include", srcdir, machinearchname);
 199         symlink(linkdest, path("cpu"));
 200
 201         /*
 202          * "cpu_base" points to cpu/<MACHINE_ARCH>
 203          */
 204         if (*srcdir == '\0')
 205                 snprintf(linkdest, sizeof(linkdest), "../../cpu/%s",
 206                     machinearchname);
 207         else
 208                 snprintf(linkdest, sizeof(linkdest), "%s/cpu/%s",
 209                     srcdir, machinearchname);
 210         symlink(linkdest, path("cpu_base"));
 211
 212         /*
 213          * XXX check directory structure for architecture subdirectories and
 214          * create the symlinks automatically XXX
 215          */
 216 #if 0
 217         for (i = 0; i < sizeof(emus) / sizeof(emus[0]); ++i) {
 218                 if (*srcdir == 0)  {
 219                         snprintf(linkdest, sizeof(linkdest),
 220                             "../../emulation/%s/%s",
 221                             emus[i], machinearchname);
 222                 } else {
 223                         snprintf(linkdest, sizeof(linkdest),
 224                             "%s/emulation/%s/%s",
 225                             srcdir, emus[i], machinearchname);
 226                 }
 227                 snprintf(linksrc, sizeof(linksrc), "arch_%s", emus[i]);
 228                 symlink(linkdest, path(linksrc));
 229         }
 230 #endif
 231
 232         options();                      /* make options .h files */
 233         makefile();                     /* build Makefile */
 234         headers();                      /* make a lot of .h files */
 235         configfile();                   /* put config file into kernel*/
 236         printf("Kernel build directory is %s\n", p);
 237         exit(EX_OK);
 238 }
 239
 240 /*
 241  * get_srcdir
 242  *      determine the root of the kernel source tree
 243  *      and save that in srcdir.
 244  */
 245 static void
 246 get_srcdir(void)
 247 {
 248
 249         if (realpath("..", srcdir) == NULL)
 250                 errx(2, "Unable to find root of source tree");
 251 }
 252
 253 static void
 254 usage(void)
 255 {
 256
 257         fprintf(stderr, "usage: config [-gpr] [-d destdir] sysname\n");
 258         exit(1);
 259 }
 260
 261 /*
 262  * get_word
 263  *      returns EOF on end of file
 264  *      NULL on end of line
 265  *      pointer to the word otherwise
 266  */
 267 char *
 268 get_word(FILE *fp)
 269 {
 270         static char line[80];
 271         int ch;
 272         char *cp;
 273         int escaped_nl = 0;
 274
 275 begin:
 276         while ((ch = getc(fp)) != EOF)
 277                 if (ch != ' ' && ch != '\t')
 278                         break;
 279         if (ch == EOF)
 280                 return((char *)EOF);
 281         if (ch == '\\') {
 282                 escaped_nl = 1;
 283                 goto begin;
 284         }
 285         if (ch == '\n') {
 286                 if (escaped_nl) {
 287                         escaped_nl = 0;
 288                         goto begin;
 289                 }
 290                 else
 291                         return(NULL);
 292         }
 293         cp = line;
 294         *cp++ = ch;
 295         while ((ch = getc(fp)) != EOF) {
 296                 if (isspace(ch))
 297                         break;
 298                 *cp++ = ch;
 299         }
 300         *cp = 0;
 301         if (ch == EOF)
 302                 return((char *)EOF);
 303         ungetc(ch, fp);
 304         return(line);
 305 }
 306
 307 /*
 308  * get_quoted_word
 309  *      like get_word but will accept something in double or single quotes
 310  *      (to allow embedded spaces).
 311  */
 312 char *
 313 get_quoted_word(FILE *fp)
 314 {
 315         static char line[256];
 316         int ch;
 317         char *cp;
 318         int escaped_nl = 0;
 319
 320 begin:
 321         while ((ch = getc(fp)) != EOF)
 322                 if (ch != ' ' && ch != '\t')
 323                         break;
 324         if (ch == EOF)
 325                 return((char *)EOF);
 326         if (ch == '\\') {
 327                 escaped_nl = 1;
 328                 goto begin;
 329         }
 330         if (ch == '\n') {
 331                 if (escaped_nl) {
 332                         escaped_nl = 0;
 333                         goto begin;
 334                 }
 335                 else
 336                         return(NULL);
 337         }
 338         cp = line;
 339         if (ch == '"' || ch == '\'') {
 340                 int quote = ch;
 341
 342                 while ((ch = getc(fp)) != EOF) {
 343                         if (ch == quote)
 344                                 break;
 345                         if (ch == '\n') {
 346                                 *cp = 0;
 347                                 printf("config: missing quote reading `%s'\n",
 348                                         line);
 349                                 exit(2);
 350                         }
 351                         *cp++ = ch;
 352                 }
 353         } else {
 354                 *cp++ = ch;
 355                 while ((ch = getc(fp)) != EOF) {
 356                         if (isspace(ch))
 357                                 break;
 358                         *cp++ = ch;
 359                 }
 360                 if (ch != EOF)
 361                         ungetc(ch, fp);
 362         }
 363         *cp = 0;
 364         if (ch == EOF)
 365                 return((char *)EOF);
 366         return(line);
 367 }
 368
 369 /*
 370  * prepend the path to a filename
 371  */
 372 char *
 373 path(const char *file)
 374 {
 375         char *cp;
 376
 377         cp = malloc((size_t)(strlen(destdir) + (file ? strlen(file) : 0) + 2));
 378         strcpy(cp, destdir);
 379         if (file != NULL) {
 380                 strcat(cp, "/");
 381                 strcat(cp, file);
 382         }
 383         return(cp);
 384 }
 385
 386 static void
 387 configfile(void)
 388 {
 389         FILE *fi, *fo;
 390         char *p;
 391         int i;
 392
 393         fi = fopen(PREFIX, "r");
 394         if (fi == NULL)
 395                 err(2, "%s", PREFIX);
 396         fo = fopen(p = path("config.c.new"), "w");
 397         if (fo == NULL)
 398                 err(2, "%s", p);
 399         fprintf(fo, "#include \"opt_config.h\"\n");
 400         fprintf(fo, "#ifdef INCLUDE_CONFIG_FILE \n");
 401         fprintf(fo, "/* Mark config as used, so gcc doesn't optimize it away. */\n");
 402         fprintf(fo, "#include <sys/types.h>\n");
 403         fprintf(fo, "__used\n");
 404         fprintf(fo, "static const char config[] = \"\\\n");
 405         fprintf(fo, "START CONFIG FILE %s\\n\\\n___", PREFIX);
 406         while (EOF != (i = getc(fi))) {
 407                 if (i == '\n') {
 408                         fprintf(fo, "\\n\\\n___");
 409                 } else if (i == '\"') {
 410                         fprintf(fo, "\\\"");
 411                 } else if (i == '\\') {
 412                         fprintf(fo, "\\\\");
 413                 } else {
 414                         putc(i, fo);
 415                 }
 416         }
 417         fprintf(fo, "\\n\\\nEND CONFIG FILE %s\\n\\\n", PREFIX);
 418         fprintf(fo, "\";\n");
 419         fprintf(fo, "\n#endif /* INCLUDE_CONFIG_FILE */\n");
 420         fclose(fi);
 421         fclose(fo);
 422         moveifchanged(path("config.c.new"), path("config.c"));
 423 }
 424
 425 /*
 426  * moveifchanged --
 427  *      compare two files; rename if changed.
 428  */
 429 void
 430 moveifchanged(const char *from_name, const char *to_name)
 431 {
 432         char *p, *q;
 433         int changed;
 434         size_t tsize;
 435         struct stat from_sb, to_sb;
 436         int from_fd, to_fd;
 437
 438         changed = 0;
 439
 440         if ((from_fd = open(from_name, O_RDONLY)) < 0)
 441                 err(EX_OSERR, "moveifchanged open(%s)", from_name);
 442
 443         if ((to_fd = open(to_name, O_RDONLY)) < 0)
 444                 changed++;
 445
 446         if (!changed && fstat(from_fd, &from_sb) < 0)
 447                 err(EX_OSERR, "moveifchanged fstat(%s)", from_name);
 448
 449         if (!changed && fstat(to_fd, &to_sb) < 0)
 450                 err(EX_OSERR, "moveifchanged fstat(%s)", to_name);
 451
 452         if (!changed && from_sb.st_size != to_sb.st_size)
 453                 changed++;
 454
 455         tsize = (size_t)from_sb.st_size;
 456
 457         if (!changed) {
 458                 p = mmap(NULL, tsize, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 459 #ifndef MAP_FAILED
 460 #define MAP_FAILED ((caddr_t)-1)
 461 #endif
 462                 if (p == MAP_FAILED)
 463                         err(EX_OSERR, "mmap %s", from_name);
 464                 q = mmap(NULL, tsize, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 465                 if (q == MAP_FAILED)
 466                         err(EX_OSERR, "mmap %s", to_name);
 467
 468                 changed = memcmp(p, q, tsize);
 469                 munmap(p, tsize);
 470                 munmap(q, tsize);
 471         }
 472         if (changed) {
 473                 if (rename(from_name, to_name) < 0)
 474                         err(EX_OSERR, "rename(%s, %s)", from_name, to_name);
 475         } else {
 476                 if (unlink(from_name) < 0)
 477                         err(EX_OSERR, "unlink(%s)", from_name);
 478         }
 479 }