09086b0499
to fail when the logical current directory no longer exists. Allow changes to absolute paths when logical cwd is invalid, fall back to physical cd if logical cd fails.
444 lines
9.8 KiB
C
444 lines
9.8 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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/*
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* The cd and pwd commands.
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*/
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#include "shell.h"
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#include "var.h"
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#include "nodes.h" /* for jobs.h */
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#include "jobs.h"
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#include "options.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "exec.h"
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#include "redir.h"
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#include "mystring.h"
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#include "show.h"
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#include "cd.h"
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STATIC int cdlogical(char *);
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STATIC int cdphysical(char *);
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STATIC int docd(char *, int, int);
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STATIC char *getcomponent(void);
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STATIC int updatepwd(char *);
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char *curdir = NULL; /* current working directory */
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char *prevdir; /* previous working directory */
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STATIC char *cdcomppath;
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int
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cdcmd(int argc, char **argv)
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{
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char *dest;
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char *path;
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char *p;
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struct stat statb;
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int ch, phys, print = 0;
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optreset = 1; optind = 1; /* initialize getopt */
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phys = 0;
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while ((ch = getopt(argc, argv, "LP")) != -1) {
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switch (ch) {
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case 'L':
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phys = 0;
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break;
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case 'P':
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phys = 1;
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break;
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default:
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error("unknown option: -%c", optopt);
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc > 1)
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error("too many arguments");
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if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
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error("HOME not set");
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if (*dest == '\0')
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dest = ".";
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if (dest[0] == '-' && dest[1] == '\0') {
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dest = prevdir ? prevdir : curdir;
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if (dest)
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print = 1;
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else
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dest = ".";
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}
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if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
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path = nullstr;
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while ((p = padvance(&path, dest)) != NULL) {
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if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
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if (!print) {
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/*
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* XXX - rethink
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*/
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if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
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p += 2;
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print = strcmp(p, dest);
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}
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if (docd(p, print, phys) >= 0)
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return 0;
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}
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}
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error("can't cd to %s", dest);
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/*NOTREACHED*/
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return 0;
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}
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/*
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* Actually change the directory. In an interactive shell, print the
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* directory name if "print" is nonzero.
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*/
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STATIC int
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docd(char *dest, int print, int phys)
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{
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TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
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/* If logical cd fails, fall back to physical. */
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if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
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return (-1);
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if (print && iflag && curdir)
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out1fmt("%s\n", curdir);
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return 0;
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}
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STATIC int
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cdlogical(char *dest)
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{
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char *p;
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char *q;
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char *component;
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struct stat statb;
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int first;
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int badstat;
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/*
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* Check each component of the path. If we find a symlink or
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* something we can't stat, clear curdir to force a getcwd()
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* next time we get the value of the current directory.
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*/
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badstat = 0;
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cdcomppath = stalloc(strlen(dest) + 1);
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scopy(dest, cdcomppath);
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STARTSTACKSTR(p);
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if (*dest == '/') {
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STPUTC('/', p);
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cdcomppath++;
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}
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first = 1;
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while ((q = getcomponent()) != NULL) {
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if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
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continue;
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if (! first)
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STPUTC('/', p);
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first = 0;
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component = q;
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while (*q)
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STPUTC(*q++, p);
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if (equal(component, ".."))
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continue;
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STACKSTRNUL(p);
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if (lstat(stackblock(), &statb) < 0) {
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badstat = 1;
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break;
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}
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}
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INTOFF;
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if (updatepwd(badstat ? NULL : dest) < 0 || chdir(curdir) < 0) {
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INTON;
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return (-1);
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}
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INTON;
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return (0);
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}
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STATIC int
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cdphysical(char *dest)
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{
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INTOFF;
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if (chdir(dest) < 0 || updatepwd(NULL) < 0) {
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INTON;
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return (-1);
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}
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INTON;
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return (0);
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}
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/*
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* Get the next component of the path name pointed to by cdcomppath.
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* This routine overwrites the string pointed to by cdcomppath.
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*/
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STATIC char *
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getcomponent(void)
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{
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char *p;
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char *start;
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if ((p = cdcomppath) == NULL)
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return NULL;
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start = cdcomppath;
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while (*p != '/' && *p != '\0')
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p++;
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if (*p == '\0') {
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cdcomppath = NULL;
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} else {
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*p++ = '\0';
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cdcomppath = p;
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}
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return start;
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}
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/*
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* Update curdir (the name of the current directory) in response to a
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* cd command. We also call hashcd to let the routines in exec.c know
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* that the current directory has changed.
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*/
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STATIC int
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updatepwd(char *dir)
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{
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char *new;
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char *p;
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hashcd(); /* update command hash table */
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/*
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* If our argument is NULL, we don't know the current directory
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* any more because we traversed a symbolic link or something
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* we couldn't stat().
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*/
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if (dir == NULL || curdir == NULL) {
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if (prevdir)
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ckfree(prevdir);
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INTOFF;
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prevdir = curdir;
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curdir = NULL;
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if (getpwd() == NULL) {
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INTON;
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return (-1);
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}
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setvar("PWD", curdir, VEXPORT);
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setvar("OLDPWD", prevdir, VEXPORT);
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INTON;
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return (0);
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}
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cdcomppath = stalloc(strlen(dir) + 1);
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scopy(dir, cdcomppath);
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STARTSTACKSTR(new);
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if (*dir != '/') {
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p = curdir;
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while (*p)
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STPUTC(*p++, new);
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if (p[-1] == '/')
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STUNPUTC(new);
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}
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while ((p = getcomponent()) != NULL) {
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if (equal(p, "..")) {
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while (new > stackblock() && (STUNPUTC(new), *new) != '/');
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} else if (*p != '\0' && ! equal(p, ".")) {
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STPUTC('/', new);
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while (*p)
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STPUTC(*p++, new);
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}
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}
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if (new == stackblock())
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STPUTC('/', new);
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STACKSTRNUL(new);
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INTOFF;
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if (prevdir)
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ckfree(prevdir);
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prevdir = curdir;
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curdir = savestr(stackblock());
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setvar("PWD", curdir, VEXPORT);
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setvar("OLDPWD", prevdir, VEXPORT);
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INTON;
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return (0);
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}
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#define MAXPWD 256
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int
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pwdcmd(int argc __unused, char **argv __unused)
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{
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char buf[MAXPWD];
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int ch, phys;
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optreset = 1; optind = 1; /* initialize getopt */
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phys = 0;
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while ((ch = getopt(argc, argv, "LP")) != -1) {
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switch (ch) {
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case 'L':
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phys = 0;
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break;
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case 'P':
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phys = 1;
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break;
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default:
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error("unknown option: -%c", optopt);
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 0)
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error("too many arguments");
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if (!phys && getpwd()) {
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out1str(curdir);
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out1c('\n');
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} else {
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if (getcwd(buf, sizeof(buf)) == NULL)
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error(".: %s", strerror(errno));
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out1str(buf);
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out1c('\n');
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}
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return 0;
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}
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/*
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* Find out what the current directory is. If we already know the current
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* directory, this routine returns immediately.
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*/
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char *
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getpwd(void)
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{
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char buf[MAXPWD];
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if (curdir)
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return curdir;
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/*
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* Things are a bit complicated here; we could have just used
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* getcwd, but traditionally getcwd is implemented using popen
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* to /bin/pwd. This creates a problem for us, since we cannot
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* keep track of the job if it is being ran behind our backs.
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* So we re-implement getcwd(), and we suppress interrupts
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* throughout the process. This is not completely safe, since
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* the user can still break out of it by killing the pwd program.
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* We still try to use getcwd for systems that we know have a
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* c implementation of getcwd, that does not open a pipe to
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* /bin/pwd.
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*/
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__SVR4)
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if (getcwd(buf, sizeof(buf)) == NULL) {
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char *pwd = getenv("PWD");
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struct stat stdot, stpwd;
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if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
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stat(pwd, &stpwd) != -1 &&
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stdot.st_dev == stpwd.st_dev &&
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stdot.st_ino == stpwd.st_ino) {
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curdir = savestr(pwd);
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return curdir;
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}
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return NULL;
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}
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curdir = savestr(buf);
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#else
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{
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char *p;
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int i;
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int status;
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struct job *jp;
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int pip[2];
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INTOFF;
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if (pipe(pip) < 0)
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error("Pipe call failed: %s", strerror(errno));
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jp = makejob((union node *)NULL, 1);
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if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
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(void) close(pip[0]);
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if (pip[1] != 1) {
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close(1);
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copyfd(pip[1], 1);
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close(pip[1]);
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}
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(void) execl("/bin/pwd", "pwd", (char *)0);
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error("Cannot exec /bin/pwd");
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}
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(void) close(pip[1]);
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pip[1] = -1;
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p = buf;
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while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0
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|| (i == -1 && errno == EINTR)) {
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if (i > 0)
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p += i;
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}
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(void) close(pip[0]);
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pip[0] = -1;
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status = waitforjob(jp);
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if (status != 0)
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error((char *)0);
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if (i < 0 || p == buf || p[-1] != '\n')
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error("pwd command failed");
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p[-1] = '\0';
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}
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curdir = savestr(buf);
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INTON;
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#endif
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return curdir;
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}
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