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/*
* realpath -- canonicalize pathnames, resolving symlinks
*
* usage: realpath [-cqsv] [-a name] pathname [pathname...]
*
* options: -a name assign each canonicalized pathname to indexed array
* variable NAME
* -c check whether or not each resolved path exists
* -q no output, exit status determines whether path is valid
* -s strip . and .. from the pathname only, no symlink resolution
* -v produce verbose output
*
*
* exit status: 0 if all pathnames resolved
* 1 if any of the pathname arguments could not be resolved
*
*
* Bash loadable builtin version
*
* Chet Ramey
* chet@po.cwru.edu
*/
/*
Copyright (C) 1999-2009,2021,2022,2023 Free Software Foundation, Inc.
This file is part of GNU Bash.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "bashansi.h"
#include <maxpath.h>
#include <errno.h>
#include "builtins.h"
#include "shell.h"
#include "bashgetopt.h"
#include "common.h"
#ifndef errno
extern int errno;
#endif
extern char *sh_realpath(const char *, char *);
int
realpath_builtin(WORD_LIST *list)
{
int opt, cflag, vflag, qflag, sflag, aflag, es;
char *r, realbuf[PATH_MAX], *p, *newpath;
struct stat sb;
#if defined (ARRAY_VARS)
arrayind_t ind;
char *aname;
SHELL_VAR *v;
#endif
if (list == 0) {
builtin_usage();
return (EX_USAGE);
}
vflag = cflag = qflag = aflag = sflag = 0;
#if defined (ARRAY_VARS)
aname = NULL;
v = NULL;
ind = 0;
#endif
reset_internal_getopt();
while ((opt = internal_getopt (list, "a:cqsv")) != -1) {
switch (opt) {
#if defined (ARRAY_VARS)
case 'a':
aflag = 1;
aname = list_optarg;
break;
#endif
case 'c':
cflag = 1;
break;
case 'q':
qflag = 1;
break;
case 's':
sflag = 1;
break;
case 'v':
vflag = 1;
break;
CASE_HELPOPT;
default:
builtin_usage();
return (EX_USAGE);
}
}
list = loptend;
if (list == 0) {
builtin_usage();
return (EX_USAGE);
}
#if defined (ARRAY_VARS)
if (aflag && valid_identifier (aname) == 0) {
sh_invalidid(aname);
return (EXECUTION_FAILURE);
}
if (aname && builtin_unbind_variable (aname) == -2)
return (EXECUTION_FAILURE);
if (aname) {
v = find_or_make_array_variable (aname, 1);
if (v == 0 || readonly_p (v) || noassign_p (v)) {
if (v && readonly_p (v))
err_readonly (aname);
return (EXECUTION_FAILURE);
} else if (array_p (v) == 0) {
builtin_error ("%s: not an indexed array", aname);
return (EXECUTION_FAILURE);
}
if (invisible_p (v))
VUNSETATTR (v, att_invisible);
array_flush (array_cell (v));
}
#endif
for (es = EXECUTION_SUCCESS; list; list = list->next) {
p = list->word->word;
if (sflag) {
/* sh_canonpath doesn't convert to absolute pathnames */
newpath = make_absolute(p, get_string_value("PWD"));
r = sh_canonpath(newpath, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
free(newpath);
} else
r = sh_realpath(p, realbuf);
if (r == 0) {
es = EXECUTION_FAILURE;
if (qflag == 0)
builtin_error("%s: cannot resolve: %s", p, strerror(errno));
continue;
}
if (cflag && (stat(r, &sb) < 0)) {
es = EXECUTION_FAILURE;
if (qflag == 0)
builtin_error("%s: %s", p, strerror(errno));
continue;
}
#if defined (ARRAY_VARS)
if (aflag) {
bind_array_element (v, ind, r, 0);
ind++;
}
#endif
if (qflag == 0) {
if (vflag)
printf ("%s -> ", p);
printf("%s\n", r);
}
if (sflag)
free (r);
}
return es;
}
char *realpath_doc[] = {
"Display pathname in canonical form.",
"",
"Display the canonicalized version of each PATHNAME argument, resolving",
"symbolic links.",
"The -a option stores each canonicalized PATHNAME argument into the indexed",
"array VARNAME.",
"The -c option checks whether or not each resolved name exists.",
"The -q option produces no output; the exit status determines the",
"validity of each PATHNAME, but any array assignment is still performed.",
"If the -s option is supplied, canonicalize . and .. pathname components",
"without resolving symbolic links.",
"The -v option produces verbose output.",
"The exit status is 0 if each PATHNAME was resolved; non-zero otherwise.",
(char *)NULL
};
struct builtin realpath_struct = {
"realpath", /* builtin name */
realpath_builtin, /* function implementing the builtin */
BUILTIN_ENABLED, /* initial flags for builtin */
realpath_doc, /* array of long documentation strings */
"realpath [-a varname] [-cqsv] pathname [pathname...]", /* usage synopsis */
0 /* reserved for internal use */
};
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