| [2460] | 1 | /* $NetBSD: cd.c,v 1.34 2003/11/14 20:00:28 dsl Exp $ */
|
|---|
| 2 |
|
|---|
| 3 | /*-
|
|---|
| 4 | * Copyright (c) 1991, 1993
|
|---|
| 5 | * The Regents of the University of California. All rights reserved.
|
|---|
| 6 | *
|
|---|
| 7 | * This code is derived from software contributed to Berkeley by
|
|---|
| 8 | * Kenneth Almquist.
|
|---|
| 9 | *
|
|---|
| 10 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 11 | * modification, are permitted provided that the following conditions
|
|---|
| 12 | * are met:
|
|---|
| 13 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 14 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 15 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 16 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 17 | * documentation and/or other materials provided with the distribution.
|
|---|
| 18 | * 3. Neither the name of the University nor the names of its contributors
|
|---|
| 19 | * may be used to endorse or promote products derived from this software
|
|---|
| 20 | * without specific prior written permission.
|
|---|
| 21 | *
|
|---|
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 32 | * SUCH DAMAGE.
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #include <sys/cdefs.h>
|
|---|
| 36 | #ifndef lint
|
|---|
| 37 | #if 0
|
|---|
| 38 | static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
|
|---|
| 39 | #else
|
|---|
| 40 | __RCSID("$NetBSD: cd.c,v 1.34 2003/11/14 20:00:28 dsl Exp $");
|
|---|
| 41 | #endif
|
|---|
| 42 | #endif /* not lint */
|
|---|
| 43 |
|
|---|
| 44 | #include <sys/types.h>
|
|---|
| 45 | #include <sys/stat.h>
|
|---|
| 46 | #include <stdlib.h>
|
|---|
| 47 | #include <string.h>
|
|---|
| 48 | #include <unistd.h>
|
|---|
| 49 | #include <errno.h>
|
|---|
| 50 |
|
|---|
| 51 | /*
|
|---|
| 52 | * The cd and pwd commands.
|
|---|
| 53 | */
|
|---|
| 54 |
|
|---|
| 55 | #include "shell.h"
|
|---|
| 56 | #include "var.h"
|
|---|
| 57 | #include "nodes.h" /* for jobs.h */
|
|---|
| 58 | #include "jobs.h"
|
|---|
| 59 | #include "options.h"
|
|---|
| 60 | #include "output.h"
|
|---|
| 61 | #include "memalloc.h"
|
|---|
| 62 | #include "error.h"
|
|---|
| 63 | #include "exec.h"
|
|---|
| 64 | #include "redir.h"
|
|---|
| 65 | #include "mystring.h"
|
|---|
| 66 | #include "show.h"
|
|---|
| 67 | #include "cd.h"
|
|---|
| 68 |
|
|---|
| 69 | STATIC int docd(char *, int);
|
|---|
| 70 | STATIC char *getcomponent(void);
|
|---|
| 71 | STATIC void updatepwd(char *);
|
|---|
| 72 | STATIC void find_curdir(int noerror);
|
|---|
| 73 |
|
|---|
| 74 | char *curdir = NULL; /* current working directory */
|
|---|
| 75 | char *prevdir; /* previous working directory */
|
|---|
| 76 | STATIC char *cdcomppath;
|
|---|
| 77 |
|
|---|
| 78 | int
|
|---|
| 79 | cdcmd(int argc, char **argv)
|
|---|
| 80 | {
|
|---|
| 81 | const char *dest;
|
|---|
| 82 | const char *path;
|
|---|
| 83 | char *p, *d;
|
|---|
| 84 | struct stat statb;
|
|---|
| 85 | int print = cdprint; /* set -cdprint to enable */
|
|---|
| 86 |
|
|---|
| 87 | nextopt(nullstr);
|
|---|
| 88 |
|
|---|
| 89 | /*
|
|---|
| 90 | * Try (quite hard) to have 'curdir' defined, nothing has set
|
|---|
| 91 | * it on entry to the shell, but we want 'cd fred; cd -' to work.
|
|---|
| 92 | */
|
|---|
| 93 | getpwd(1);
|
|---|
| 94 | dest = *argptr;
|
|---|
| 95 | if (dest == NULL) {
|
|---|
| 96 | dest = bltinlookup("HOME", 1);
|
|---|
| 97 | if (dest == NULL)
|
|---|
| 98 | error("HOME not set");
|
|---|
| 99 | } else {
|
|---|
| 100 | if (argptr[1]) {
|
|---|
| 101 | /* Do 'ksh' style substitution */
|
|---|
| 102 | if (!curdir)
|
|---|
| 103 | error("PWD not set");
|
|---|
| 104 | p = strstr(curdir, dest);
|
|---|
| 105 | if (!p)
|
|---|
| 106 | error("bad substitution");
|
|---|
| 107 | d = stalloc(strlen(curdir) + strlen(argptr[1]) + 1);
|
|---|
| 108 | memcpy(d, curdir, p - curdir);
|
|---|
| 109 | strcpy(d + (p - curdir), argptr[1]);
|
|---|
| 110 | strcat(d, p + strlen(dest));
|
|---|
| 111 | dest = d;
|
|---|
| 112 | print = 1;
|
|---|
| 113 | }
|
|---|
| 114 | }
|
|---|
| 115 |
|
|---|
| 116 | if (dest[0] == '-' && dest[1] == '\0') {
|
|---|
| 117 | dest = prevdir ? prevdir : curdir;
|
|---|
| 118 | print = 1;
|
|---|
| 119 | }
|
|---|
| 120 | if (*dest == '\0')
|
|---|
| 121 | dest = ".";
|
|---|
| 122 | if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
|
|---|
| 123 | path = nullstr;
|
|---|
| 124 | while ((p = padvance(&path, dest)) != NULL) {
|
|---|
| 125 | if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
|
|---|
| 126 | if (!print) {
|
|---|
| 127 | /*
|
|---|
| 128 | * XXX - rethink
|
|---|
| 129 | */
|
|---|
| 130 | if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
|
|---|
| 131 | p += 2;
|
|---|
| 132 | print = strcmp(p, dest);
|
|---|
| 133 | }
|
|---|
| 134 | if (docd(p, print) >= 0)
|
|---|
| 135 | return 0;
|
|---|
| 136 |
|
|---|
| 137 | }
|
|---|
| 138 | }
|
|---|
| 139 | error("can't cd to %s", dest);
|
|---|
| 140 | /* NOTREACHED */
|
|---|
| 141 | }
|
|---|
| 142 |
|
|---|
| 143 |
|
|---|
| 144 | /*
|
|---|
| 145 | * Actually do the chdir. In an interactive shell, print the
|
|---|
| 146 | * directory name if "print" is nonzero.
|
|---|
| 147 | */
|
|---|
| 148 |
|
|---|
| 149 | STATIC int
|
|---|
| 150 | docd(char *dest, int print)
|
|---|
| 151 | {
|
|---|
| 152 | char *p;
|
|---|
| 153 | char *q;
|
|---|
| 154 | char *component;
|
|---|
| 155 | struct stat statb;
|
|---|
| 156 | int first;
|
|---|
| 157 | int badstat;
|
|---|
| 158 |
|
|---|
| 159 | TRACE(("docd(\"%s\", %d) called\n", dest, print));
|
|---|
| 160 |
|
|---|
| 161 | /*
|
|---|
| 162 | * Check each component of the path. If we find a symlink or
|
|---|
| 163 | * something we can't stat, clear curdir to force a getcwd()
|
|---|
| 164 | * next time we get the value of the current directory.
|
|---|
| 165 | */
|
|---|
| 166 | badstat = 0;
|
|---|
| 167 | cdcomppath = stalloc(strlen(dest) + 1);
|
|---|
| 168 | scopy(dest, cdcomppath);
|
|---|
| 169 | STARTSTACKSTR(p);
|
|---|
| 170 | if (*dest == '/') {
|
|---|
| 171 | STPUTC('/', p);
|
|---|
| 172 | cdcomppath++;
|
|---|
| 173 | }
|
|---|
| 174 | first = 1;
|
|---|
| 175 | while ((q = getcomponent()) != NULL) {
|
|---|
| 176 | if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
|
|---|
| 177 | continue;
|
|---|
| 178 | if (! first)
|
|---|
| 179 | STPUTC('/', p);
|
|---|
| 180 | first = 0;
|
|---|
| 181 | component = q;
|
|---|
| 182 | while (*q)
|
|---|
| 183 | STPUTC(*q++, p);
|
|---|
| 184 | if (equal(component, ".."))
|
|---|
| 185 | continue;
|
|---|
| 186 | STACKSTRNUL(p);
|
|---|
| 187 | if ((lstat(stackblock(), &statb) < 0)
|
|---|
| 188 | || (S_ISLNK(statb.st_mode))) {
|
|---|
| 189 | /* print = 1; */
|
|---|
| 190 | badstat = 1;
|
|---|
| 191 | break;
|
|---|
| 192 | }
|
|---|
| 193 | }
|
|---|
| 194 |
|
|---|
| 195 | INTOFF;
|
|---|
| 196 | if (chdir(dest) < 0) {
|
|---|
| 197 | INTON;
|
|---|
| 198 | return -1;
|
|---|
| 199 | }
|
|---|
| 200 | updatepwd(badstat ? NULL : dest);
|
|---|
| 201 | INTON;
|
|---|
| 202 | if (print && iflag && curdir)
|
|---|
| 203 | out1fmt("%s\n", curdir);
|
|---|
| 204 | return 0;
|
|---|
| 205 | }
|
|---|
| 206 |
|
|---|
| 207 |
|
|---|
| 208 | /*
|
|---|
| 209 | * Get the next component of the path name pointed to by cdcomppath.
|
|---|
| 210 | * This routine overwrites the string pointed to by cdcomppath.
|
|---|
| 211 | */
|
|---|
| 212 |
|
|---|
| 213 | STATIC char *
|
|---|
| 214 | getcomponent()
|
|---|
| 215 | {
|
|---|
| 216 | char *p;
|
|---|
| 217 | char *start;
|
|---|
| 218 |
|
|---|
| 219 | if ((p = cdcomppath) == NULL)
|
|---|
| 220 | return NULL;
|
|---|
| 221 | start = cdcomppath;
|
|---|
| 222 | while (*p != '/' && *p != '\0')
|
|---|
| 223 | p++;
|
|---|
| 224 | if (*p == '\0') {
|
|---|
| 225 | cdcomppath = NULL;
|
|---|
| 226 | } else {
|
|---|
| 227 | *p++ = '\0';
|
|---|
| 228 | cdcomppath = p;
|
|---|
| 229 | }
|
|---|
| 230 | return start;
|
|---|
| 231 | }
|
|---|
| 232 |
|
|---|
| 233 |
|
|---|
| 234 |
|
|---|
| 235 | /*
|
|---|
| 236 | * Update curdir (the name of the current directory) in response to a
|
|---|
| 237 | * cd command. We also call hashcd to let the routines in exec.c know
|
|---|
| 238 | * that the current directory has changed.
|
|---|
| 239 | */
|
|---|
| 240 |
|
|---|
| 241 | STATIC void
|
|---|
| 242 | updatepwd(char *dir)
|
|---|
| 243 | {
|
|---|
| 244 | char *new;
|
|---|
| 245 | char *p;
|
|---|
| 246 |
|
|---|
| 247 | hashcd(); /* update command hash table */
|
|---|
| 248 |
|
|---|
| 249 | /*
|
|---|
| 250 | * If our argument is NULL, we don't know the current directory
|
|---|
| 251 | * any more because we traversed a symbolic link or something
|
|---|
| 252 | * we couldn't stat().
|
|---|
| 253 | */
|
|---|
| 254 | if (dir == NULL || curdir == NULL) {
|
|---|
| 255 | if (prevdir)
|
|---|
| 256 | ckfree(prevdir);
|
|---|
| 257 | INTOFF;
|
|---|
| 258 | prevdir = curdir;
|
|---|
| 259 | curdir = NULL;
|
|---|
| 260 | getpwd(1);
|
|---|
| 261 | INTON;
|
|---|
| 262 | if (curdir)
|
|---|
| 263 | setvar("PWD", curdir, VEXPORT);
|
|---|
| 264 | else
|
|---|
| 265 | unsetvar("PWD", 0);
|
|---|
| 266 | return;
|
|---|
| 267 | }
|
|---|
| 268 | cdcomppath = stalloc(strlen(dir) + 1);
|
|---|
| 269 | scopy(dir, cdcomppath);
|
|---|
| 270 | STARTSTACKSTR(new);
|
|---|
| 271 | if (*dir != '/') {
|
|---|
| 272 | p = curdir;
|
|---|
| 273 | while (*p)
|
|---|
| 274 | STPUTC(*p++, new);
|
|---|
| 275 | if (p[-1] == '/')
|
|---|
| 276 | STUNPUTC(new);
|
|---|
| 277 | }
|
|---|
| 278 | while ((p = getcomponent()) != NULL) {
|
|---|
| 279 | if (equal(p, "..")) {
|
|---|
| 280 | while (new > stackblock() && (STUNPUTC(new), *new) != '/');
|
|---|
| 281 | } else if (*p != '\0' && ! equal(p, ".")) {
|
|---|
| 282 | STPUTC('/', new);
|
|---|
| 283 | while (*p)
|
|---|
| 284 | STPUTC(*p++, new);
|
|---|
| 285 | }
|
|---|
| 286 | }
|
|---|
| 287 | if (new == stackblock())
|
|---|
| 288 | STPUTC('/', new);
|
|---|
| 289 | STACKSTRNUL(new);
|
|---|
| 290 | INTOFF;
|
|---|
| 291 | if (prevdir)
|
|---|
| 292 | ckfree(prevdir);
|
|---|
| 293 | prevdir = curdir;
|
|---|
| 294 | curdir = savestr(stackblock());
|
|---|
| 295 | setvar("PWD", curdir, VEXPORT);
|
|---|
| 296 | INTON;
|
|---|
| 297 | }
|
|---|
| 298 |
|
|---|
| 299 | /*
|
|---|
| 300 | * Posix says the default should be 'pwd -L' (as below), however
|
|---|
| 301 | * the 'cd' command (above) does something much nearer to the
|
|---|
| 302 | * posix 'cd -P' (not the posix default of 'cd -L').
|
|---|
| 303 | * If 'cd' is changed to support -P/L then the default here
|
|---|
| 304 | * needs to be revisited if the historic behaviour is to be kept.
|
|---|
| 305 | */
|
|---|
| 306 |
|
|---|
| 307 | int
|
|---|
| 308 | pwdcmd(int argc, char **argv)
|
|---|
| 309 | {
|
|---|
| 310 | int i;
|
|---|
| 311 | char opt = 'L';
|
|---|
| 312 |
|
|---|
| 313 | while ((i = nextopt("LP")) != '\0')
|
|---|
| 314 | opt = i;
|
|---|
| 315 | if (*argptr)
|
|---|
| 316 | error("unexpected argument");
|
|---|
| 317 |
|
|---|
| 318 | if (opt == 'L')
|
|---|
| 319 | getpwd(0);
|
|---|
| 320 | else
|
|---|
| 321 | find_curdir(0);
|
|---|
| 322 |
|
|---|
| 323 | setvar("PWD", curdir, VEXPORT);
|
|---|
| 324 | out1str(curdir);
|
|---|
| 325 | out1c('\n');
|
|---|
| 326 | return 0;
|
|---|
| 327 | }
|
|---|
| 328 |
|
|---|
| 329 |
|
|---|
| 330 |
|
|---|
| 331 |
|
|---|
| 332 | #define MAXPWD 256
|
|---|
| 333 |
|
|---|
| 334 | /*
|
|---|
| 335 | * Find out what the current directory is. If we already know the current
|
|---|
| 336 | * directory, this routine returns immediately.
|
|---|
| 337 | */
|
|---|
| 338 | void
|
|---|
| 339 | getpwd(int noerror)
|
|---|
| 340 | {
|
|---|
| 341 | char *pwd;
|
|---|
| 342 | struct stat stdot, stpwd;
|
|---|
| 343 | static int first = 1;
|
|---|
| 344 |
|
|---|
| 345 | if (curdir)
|
|---|
| 346 | return;
|
|---|
| 347 |
|
|---|
| 348 | if (first) {
|
|---|
| 349 | first = 0;
|
|---|
| 350 | pwd = getenv("PWD");
|
|---|
| 351 | if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
|
|---|
| 352 | stat(pwd, &stpwd) != -1 &&
|
|---|
| 353 | stdot.st_dev == stpwd.st_dev &&
|
|---|
| 354 | stdot.st_ino == stpwd.st_ino) {
|
|---|
| 355 | curdir = savestr(pwd);
|
|---|
| 356 | return;
|
|---|
| 357 | }
|
|---|
| 358 | }
|
|---|
| 359 |
|
|---|
| 360 | find_curdir(noerror);
|
|---|
| 361 |
|
|---|
| 362 | return;
|
|---|
| 363 | }
|
|---|
| 364 |
|
|---|
| 365 | STATIC void
|
|---|
| 366 | find_curdir(int noerror)
|
|---|
| 367 | {
|
|---|
| 368 | int i;
|
|---|
| 369 | char *pwd;
|
|---|
| 370 |
|
|---|
| 371 | /*
|
|---|
| 372 | * Things are a bit complicated here; we could have just used
|
|---|
| 373 | * getcwd, but traditionally getcwd is implemented using popen
|
|---|
| 374 | * to /bin/pwd. This creates a problem for us, since we cannot
|
|---|
| 375 | * keep track of the job if it is being ran behind our backs.
|
|---|
| 376 | * So we re-implement getcwd(), and we suppress interrupts
|
|---|
| 377 | * throughout the process. This is not completely safe, since
|
|---|
| 378 | * the user can still break out of it by killing the pwd program.
|
|---|
| 379 | * We still try to use getcwd for systems that we know have a
|
|---|
| 380 | * c implementation of getcwd, that does not open a pipe to
|
|---|
| 381 | * /bin/pwd.
|
|---|
| 382 | */
|
|---|
| 383 | #if defined(__NetBSD__) || defined(__SVR4)
|
|---|
| 384 |
|
|---|
| 385 | for (i = MAXPWD;; i *= 2) {
|
|---|
| 386 | pwd = stalloc(i);
|
|---|
| 387 | if (getcwd(pwd, i) != NULL) {
|
|---|
| 388 | curdir = savestr(pwd);
|
|---|
| 389 | return;
|
|---|
| 390 | }
|
|---|
| 391 | stunalloc(pwd);
|
|---|
| 392 | if (errno == ERANGE)
|
|---|
| 393 | continue;
|
|---|
| 394 | if (!noerror)
|
|---|
| 395 | error("getcwd() failed: %s", strerror(errno));
|
|---|
| 396 | return;
|
|---|
| 397 | }
|
|---|
| 398 | #else
|
|---|
| 399 | {
|
|---|
| 400 | char *p;
|
|---|
| 401 | int status;
|
|---|
| 402 | struct job *jp;
|
|---|
| 403 | int pip[2];
|
|---|
| 404 |
|
|---|
| 405 | pwd = stalloc(MAXPWD);
|
|---|
| 406 | INTOFF;
|
|---|
| 407 | if (pipe(pip) < 0)
|
|---|
| 408 | error("Pipe call failed");
|
|---|
| 409 | jp = makejob((union node *)NULL, 1);
|
|---|
| 410 | if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
|
|---|
| 411 | (void) close(pip[0]);
|
|---|
| 412 | if (pip[1] != 1) {
|
|---|
| 413 | close(1);
|
|---|
| 414 | copyfd(pip[1], 1);
|
|---|
| 415 | close(pip[1]);
|
|---|
| 416 | }
|
|---|
| 417 | (void) execl("/bin/pwd", "pwd", (char *)0);
|
|---|
| 418 | error("Cannot exec /bin/pwd");
|
|---|
| 419 | }
|
|---|
| 420 | (void) close(pip[1]);
|
|---|
| 421 | pip[1] = -1;
|
|---|
| 422 | p = pwd;
|
|---|
| 423 | while ((i = read(pip[0], p, pwd + MAXPWD - p)) > 0
|
|---|
| 424 | || (i == -1 && errno == EINTR)) {
|
|---|
| 425 | if (i > 0)
|
|---|
| 426 | p += i;
|
|---|
| 427 | }
|
|---|
| 428 | (void) close(pip[0]);
|
|---|
| 429 | pip[0] = -1;
|
|---|
| 430 | status = waitforjob(jp);
|
|---|
| 431 | if (status != 0)
|
|---|
| 432 | error((char *)0);
|
|---|
| 433 | if (i < 0 || p == pwd || p[-1] != '\n') {
|
|---|
| 434 | if (noerror) {
|
|---|
| 435 | INTON;
|
|---|
| 436 | return;
|
|---|
| 437 | }
|
|---|
| 438 | error("pwd command failed");
|
|---|
| 439 | }
|
|---|
| 440 | p[-1] = '\0';
|
|---|
| 441 | INTON;
|
|---|
| 442 | curdir = savestr(pwd);
|
|---|
| 443 | return;
|
|---|
| 444 | }
|
|---|
| 445 | #endif
|
|---|
| 446 | }
|
|---|
