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