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/mman.h>
  37 #include <sys/param.h>
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <fcntl.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 *  platformname;
  59 char *  machinename;
  60 char *  machinearchname;
  61
  62 struct cputype  *cputype;
  63 struct opt      *opt, *mkopt;
  64 struct opt_list *otab;
  65
  66 char *  PREFIX;
  67 char    destdir[MAXPATHLEN];
  68 char    srcdir[MAXPATHLEN - 32];
  69
  70 static int no_config_clobber = TRUE;
  71 int     debugging;
  72
  73 extern int yyparse(void);
  74 static void configfile(void);
  75 static void get_srcdir(void);
  76 static void usage(void);
  77
  78 /*
  79  * Config builds a set of files for building a UNIX
  80  * system given a description of the desired system.
  81  */
  82 int
  83 main(int argc, char *argv[])
  84 {
  85         struct stat buf;
  86         int ch, len;
  87         char *p;
  88         char linkdest[MAXPATHLEN];
  89 #if 0
  90         unsigned int i;
  91         char linksrc[64];
  92         static const char *emus[] = { "linux" };
  93 #endif
  94
  95         while ((ch = getopt(argc, argv, "d:gr")) != -1)
  96                 switch (ch) {
  97                 case 'd':
  98                         if (*destdir == '\0')
  99                                 strlcpy(destdir, optarg, sizeof(destdir));
 100                         else
 101                                 errx(2, "directory already set");
 102                         break;
 103                 case 'g':
 104                         debugging++;
 105                         break;
 106                 case 'r':
 107                         no_config_clobber = FALSE;
 108                         break;
 109                 case '?':
 110                 default:
 111                         usage();
 112                 }
 113         argc -= optind;
 114         argv += optind;
 115
 116         if (argc != 1)
 117                 usage();
 118
 119         if (freopen(PREFIX = *argv, "r", stdin) == NULL)
 120                 err(2, "%s", PREFIX);
 121
 122         if (*destdir != '\0') {
 123                 len = strlen(destdir);
 124                 while (len > 1 && destdir[len - 1] == '/')
 125                         destdir[--len] = '\0';
 126                 get_srcdir();
 127         } else {
 128                 strlcpy(destdir, CDIR, sizeof(destdir));
 129                 strlcat(destdir, PREFIX, sizeof(destdir));
 130         }
 131
 132         p = path(NULL);
 133         if (stat(p, &buf)) {
 134                 if (mkdir(p, 0777))
 135                         err(2, "%s", p);
 136         }
 137         else if ((buf.st_mode & S_IFMT) != S_IFDIR) {
 138                 errx(2, "%s isn't a directory", p);
 139         }
 140         else if (!no_config_clobber) {
 141                 char tmp[strlen(p) + 8];
 142
 143                 fprintf(stderr, "Removing old directory %s:  ", p);
 144                 fflush(stderr);
 145                 snprintf(tmp, sizeof(tmp), "rm -rf %s", p);
 146                 if (system(tmp)) {
 147                         fprintf(stderr, "Failed!\n");
 148                         err(2, "%s", tmp);
 149                 }
 150                 fprintf(stderr, "Done.\n");
 151                 if (mkdir(p, 0777))
 152                         err(2, "%s", p);
 153         }
 154
 155         dtab = NULL;
 156         if (yyparse())
 157                 exit(3);
 158         if (platformname == NULL) {
 159                 printf("Specify platform architecture, e.g. 'platform pc64'\n");
 160                 exit(1);
 161         }
 162         if (machinename == NULL) {
 163                 printf("Specify machine architecture, e.g. 'machine x86_64'\n");
 164                 exit(1);
 165         }
 166         if (machinearchname == NULL) {
 167                 printf("Specify cpu architecture, e.g. 'machine_arch x86_64'\n");
 168                 exit(1);
 169         }
 170         newbus_ioconf();
 171
 172         /*
 173          * "machine" points into platform/<PLATFORM>/include
 174          */
 175         if (*srcdir == '\0')
 176                 snprintf(linkdest, sizeof(linkdest), "../../platform/%s/include",
 177                     platformname);
 178         else
 179                 snprintf(linkdest, sizeof(linkdest), "%s/platform/%s/include",
 180                     srcdir, platformname);
 181         symlink(linkdest, path("machine"));
 182
 183         /*
 184          * "machine_base" points into platform/<PLATFORM>
 185          */
 186         if (*srcdir == '\0')
 187                 snprintf(linkdest, sizeof(linkdest), "../../platform/%s",
 188                     platformname);
 189         else
 190                 snprintf(linkdest, sizeof(linkdest), "%s/platform/%s",
 191                     srcdir, platformname);
 192         symlink(linkdest, path("machine_base"));
 193
 194         /*
 195          * "cpu" points to cpu/<MACHINE_ARCH>/include
 196          */
 197         if (*srcdir == '\0')
 198                 snprintf(linkdest, sizeof(linkdest),
 199                          "../../cpu/%s/include", machinearchname);
 200         else
 201                 snprintf(linkdest, sizeof(linkdest),
 202                          "%s/cpu/%s/include", srcdir, machinearchname);
 203         symlink(linkdest, path("cpu"));
 204
 205         /*
 206          * "cpu_base" points to cpu/<MACHINE_ARCH>
 207          */
 208         if (*srcdir == '\0')
 209                 snprintf(linkdest, sizeof(linkdest), "../../cpu/%s",
 210                     machinearchname);
 211         else
 212                 snprintf(linkdest, sizeof(linkdest), "%s/cpu/%s",
 213                     srcdir, machinearchname);
 214         symlink(linkdest, path("cpu_base"));
 215
 216         /*
 217          * XXX check directory structure for architecture subdirectories and
 218          * create the symlinks automatically XXX
 219          */
 220 #if 0
 221         for (i = 0; i < NELEM(emus); ++i) {
 222                 if (*srcdir == 0)  {
 223                         snprintf(linkdest, sizeof(linkdest),
 224                             "../../emulation/%s/%s",
 225                             emus[i], machinearchname);
 226                 } else {
 227                         snprintf(linkdest, sizeof(linkdest),
 228                             "%s/emulation/%s/%s",
 229                             srcdir, emus[i], machinearchname);
 230                 }
 231                 snprintf(linksrc, sizeof(linksrc), "arch_%s", emus[i]);
 232                 symlink(linkdest, path(linksrc));
 233         }
 234 #endif
 235
 236         options();                      /* make options .h files */
 237         makefile();                     /* build Makefile */
 238         headers();                      /* make a lot of .h files */
 239         configfile();                   /* put config file into kernel*/
 240         printf("Kernel build directory is %s\n", p);
 241         exit(EX_OK);
 242 }
 243
 244 /*
 245  * get_srcdir
 246  *      determine the root of the kernel source tree
 247  *      and save that in srcdir.
 248  */
 249 static void
 250 get_srcdir(void)
 251 {
 252
 253         if (realpath("..", srcdir) == NULL)
 254                 errx(2, "Unable to find root of source tree");
 255 }
 256
 257 static void
 258 usage(void)
 259 {
 260
 261         fprintf(stderr, "usage: config [-gpr] [-d destdir] sysname\n");
 262         exit(1);
 263 }
 264
 265 /*
 266  * get_word
 267  *      returns EOF on end of file
 268  *      NULL on end of line
 269  *      pointer to the word otherwise
 270  */
 271 char *
 272 get_word(FILE *fp)
 273 {
 274         static char line[80];
 275         int ch;
 276         char *cp;
 277         int escaped_nl = 0;
 278
 279 begin:
 280         while ((ch = getc(fp)) != EOF)
 281                 if (ch != ' ' && ch != '\t')
 282                         break;
 283         if (ch == EOF)
 284                 return((char *)EOF);
 285         if (ch == '\\') {
 286                 escaped_nl = 1;
 287                 goto begin;
 288         }
 289         if (ch == '\n') {
 290                 if (escaped_nl) {
 291                         escaped_nl = 0;
 292                         goto begin;
 293                 }
 294                 else
 295                         return(NULL);
 296         }
 297         cp = line;
 298         *cp++ = ch;
 299         while ((ch = getc(fp)) != EOF) {
 300                 if (isspace(ch))
 301                         break;
 302                 *cp++ = ch;
 303         }
 304         *cp = 0;
 305         if (ch == EOF)
 306                 return((char *)EOF);
 307         ungetc(ch, fp);
 308         return(line);
 309 }
 310
 311 /*
 312  * get_quoted_word
 313  *      like get_word but will accept something in double or single quotes
 314  *      (to allow embedded spaces).
 315  */
 316 char *
 317 get_quoted_word(FILE *fp)
 318 {
 319         static char line[256];
 320         int ch;
 321         char *cp;
 322         int escaped_nl = 0;
 323
 324 begin:
 325         while ((ch = getc(fp)) != EOF)
 326                 if (ch != ' ' && ch != '\t')
 327                         break;
 328         if (ch == EOF)
 329                 return((char *)EOF);
 330         if (ch == '\\') {
 331                 escaped_nl = 1;
 332                 goto begin;
 333         }
 334         if (ch == '\n') {
 335                 if (escaped_nl) {
 336                         escaped_nl = 0;
 337                         goto begin;
 338                 }
 339                 else
 340                         return(NULL);
 341         }
 342         cp = line;
 343         if (ch == '"' || ch == '\'') {
 344                 int quote = ch;
 345
 346                 while ((ch = getc(fp)) != EOF) {
 347                         if (ch == quote)
 348                                 break;
 349                         if (ch == '\n') {
 350                                 *cp = 0;
 351                                 printf("config: missing quote reading `%s'\n",
 352                                         line);
 353                                 exit(2);
 354                         }
 355                         *cp++ = ch;
 356                 }
 357         } else {
 358                 *cp++ = ch;
 359                 while ((ch = getc(fp)) != EOF) {
 360                         if (isspace(ch))
 361                                 break;
 362                         *cp++ = ch;
 363                 }
 364                 if (ch != EOF)
 365                         ungetc(ch, fp);
 366         }
 367         *cp = 0;
 368         if (ch == EOF)
 369                 return((char *)EOF);
 370         return(line);
 371 }
 372
 373 /*
 374  * prepend the path to a filename
 375  */
 376 char *
 377 path(const char *file)
 378 {
 379         char *cp;
 380
 381         cp = malloc((size_t)(strlen(destdir) + (file ? strlen(file) : 0) + 2));
 382         strcpy(cp, destdir);
 383         if (file != NULL) {
 384                 strcat(cp, "/");
 385                 strcat(cp, file);
 386         }
 387         return(cp);
 388 }
 389
 390 static void
 391 configfile(void)
 392 {
 393         FILE *fi, *fo;
 394         char *p;
 395         int i;
 396
 397         fi = fopen(PREFIX, "r");
 398         if (fi == NULL)
 399                 err(2, "%s", PREFIX);
 400         fo = fopen(p = path("config.c.new"), "w");
 401         if (fo == NULL)
 402                 err(2, "%s", p);
 403         fprintf(fo, "#include \"opt_config.h\"\n");
 404         fprintf(fo, "#ifdef INCLUDE_CONFIG_FILE \n");
 405         fprintf(fo, "/* Mark config as used, so gcc doesn't optimize it away. */\n");
 406         fprintf(fo, "#include <sys/types.h>\n");
 407         fprintf(fo, "__used\n");
 408         fprintf(fo, "static const char config[] = \"\\\n");
 409         fprintf(fo, "START CONFIG FILE %s\\n\\\n___", PREFIX);
 410         while (EOF != (i = getc(fi))) {
 411                 if (i == '\n') {
 412                         fprintf(fo, "\\n\\\n___");
 413                 } else if (i == '\"') {
 414                         fprintf(fo, "\\\"");
 415                 } else if (i == '\\') {
 416                         fprintf(fo, "\\\\");
 417                 } else {
 418                         putc(i, fo);
 419                 }
 420         }
 421         fprintf(fo, "\\n\\\nEND CONFIG FILE %s\\n\\\n", PREFIX);
 422         fprintf(fo, "\";\n");
 423         fprintf(fo, "\n#endif /* INCLUDE_CONFIG_FILE */\n");
 424         fclose(fi);
 425         fclose(fo);
 426         moveifchanged(path("config.c.new"), path("config.c"));
 427 }
 428
 429 /*
 430  * moveifchanged --
 431  *      compare two files; rename if changed.
 432  */
 433 void
 434 moveifchanged(const char *from_name, const char *to_name)
 435 {
 436         char *p, *q;
 437         int changed;
 438         size_t tsize;
 439         struct stat from_sb, to_sb;
 440         int from_fd, to_fd;
 441
 442         changed = 0;
 443
 444         if ((from_fd = open(from_name, O_RDONLY)) < 0)
 445                 err(EX_OSERR, "moveifchanged open(%s)", from_name);
 446
 447         if ((to_fd = open(to_name, O_RDONLY)) < 0)
 448                 changed++;
 449
 450         if (!changed && fstat(from_fd, &from_sb) < 0)
 451                 err(EX_OSERR, "moveifchanged fstat(%s)", from_name);
 452
 453         if (!changed && fstat(to_fd, &to_sb) < 0)
 454                 err(EX_OSERR, "moveifchanged fstat(%s)", to_name);
 455
 456         if (!changed && from_sb.st_size != to_sb.st_size)
 457                 changed++;
 458
 459         tsize = (size_t)from_sb.st_size;
 460
 461         if (!changed) {
 462                 p = mmap(NULL, tsize, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 463 #ifndef MAP_FAILED
 464 #define MAP_FAILED ((caddr_t)-1)
 465 #endif
 466                 if (p == MAP_FAILED)
 467                         err(EX_OSERR, "mmap %s", from_name);
 468                 q = mmap(NULL, tsize, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 469                 if (q == MAP_FAILED)
 470                         err(EX_OSERR, "mmap %s", to_name);
 471
 472                 changed = memcmp(p, q, tsize);
 473                 munmap(p, tsize);
 474                 munmap(q, tsize);
 475         }
 476         if (changed) {
 477                 if (rename(from_name, to_name) < 0)
 478                         err(EX_OSERR, "rename(%s, %s)", from_name, to_name);
 479         } else {
 480                 if (unlink(from_name) < 0)
 481                         err(EX_OSERR, "unlink(%s)", from_name);
 482         }
 483 }