X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fmakepath.c;h=460129477b81bb3e210433a2721bb779d1e7ce60;hb=58dc681a9b810db4f7fc8b47d6c216bb169b7da4;hp=4c19630e661a782ab1f520338e05a4ffee3aefed;hpb=d7b5315b0e0d2ebba292ccf0de92fd0e7a2123e8;p=gnulib.git diff --git a/lib/makepath.c b/lib/makepath.c index 4c19630e6..460129477 100644 --- a/lib/makepath.c +++ b/lib/makepath.c @@ -1,5 +1,5 @@ /* makepath.c -- Ensure that a directory path exists. - Copyright (C) 1990 Free Software Foundation, Inc. + Copyright (C) 1990, 1997 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -12,50 +12,63 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -/* Written by David MacKenzie and - Jim Meyering . */ +/* Written by David MacKenzie and Jim Meyering. */ -#ifdef __GNUC__ -#define alloca __builtin_alloca -#else -#ifdef HAVE_ALLOCA_H -#include -#else -#ifdef _AIX - #pragma alloca +#if HAVE_CONFIG_H +# include +#endif + +#if __GNUC__ +# define alloca __builtin_alloca #else +# if HAVE_ALLOCA_H +# include +# else +# ifdef _AIX + # pragma alloca +# else char *alloca (); -#endif -#endif +# endif +# endif #endif #include #include #include -#ifdef HAVE_UNISTD_H -#include +#if HAVE_UNISTD_H +# include +#endif + +#if STAT_MACROS_BROKEN +# undef S_ISDIR #endif + #if !defined(S_ISDIR) && defined(S_IFDIR) -#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) +# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) #endif -#ifdef STDC_HEADERS -#include -#include -#else -extern int errno; +#if STDC_HEADERS +# include #endif -#if defined(STDC_HEADERS) || defined(HAVE_STRING_H) -#include -#ifndef index -#define index strchr +#if HAVE_ERRNO_H +# include #endif + +#ifndef errno +extern int errno; +#endif + +#if HAVE_STRING_H +# include #else -#include +# include +# ifndef strchr +# define strchr index +# endif #endif #ifdef __MSDOS__ @@ -63,42 +76,79 @@ typedef int uid_t; typedef int gid_t; #endif -void error (); +#include "save-cwd.h" +#include "makepath.h" +#include "error.h" + +void strip_trailing_slashes (); + +#define CLEANUP_CWD \ + do \ + { \ + /* We're done operating on basename_dir. \ + Restore working directory. */ \ + if (saved_cwd) \ + { \ + int fail = restore_cwd (&cwd, NULL, NULL); \ + free_cwd (&cwd); \ + if (fail) \ + return 1; \ + } \ + } \ + while (0) + +#define CLEANUP \ + do \ + { \ + umask (oldmask); \ + CLEANUP_CWD; \ + } \ + while (0) /* Ensure that the directory ARGPATH exists. Remove any trailing slashes from ARGPATH before calling this function. - Make any leading directories that don't already exist, with + Create any leading directories that don't already exist, with permissions PARENT_MODE. If the last element of ARGPATH does not exist, create it as a new directory with permissions MODE. - If OWNER and GROUP are non-negative, make them the UID and GID of - created directories. + If OWNER and GROUP are non-negative, use them to set the UID and GID of + any created directories. If VERBOSE_FMT_STRING is nonzero, use it as a printf format string for printing a message after successfully making a directory, with the name of the directory that was just made as an argument. + If PRESERVE_EXISTING is non-zero and ARGPATH is an existing directory, + then do not attempt to set its permissions and ownership. Return 0 if ARGPATH exists as a directory with the proper ownership and permissions when done, otherwise 1. */ +#if __STDC__ +int +make_path (const char *argpath, + int mode, + int parent_mode, + uid_t owner, + gid_t group, + int preserve_existing, + const char *verbose_fmt_string) +#else int -make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) - char *argpath; +make_path (argpath, mode, parent_mode, owner, group, preserve_existing, + verbose_fmt_string) + const char *argpath; int mode; int parent_mode; uid_t owner; gid_t group; - char *verbose_fmt_string; + int preserve_existing; + const char *verbose_fmt_string; +#endif { - char *dirpath; /* A copy we can scribble NULs on. */ struct stat stats; int retval = 0; - int oldmask = umask (0); - dirpath = (char *) alloca (strlen (argpath) + 1); - strcpy (dirpath, argpath); - - if (stat (dirpath, &stats)) + if (stat (argpath, &stats)) { char *slash; int tmp_mode; /* Initial perms for leading dirs. */ @@ -109,6 +159,19 @@ make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) struct ptr_list *next; }; struct ptr_list *p, *leading_dirs = NULL; + int saved_cwd = 0; + struct saved_cwd cwd; + char *basename_dir; + int first_subdir = 1; + char *dirpath; + + /* Temporarily relax umask in case it's overly restrictive. */ + int oldmask = umask (0); + + /* Make a copy of ARGPATH that we can scribble NULs on. */ + dirpath = (char *) alloca (strlen (argpath) + 1); + strcpy (dirpath, argpath); + strip_trailing_slashes (dirpath); /* If leading directories shouldn't be writable or executable, or should have set[ug]id or sticky bits set and we are setting @@ -127,17 +190,36 @@ make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) } slash = dirpath; + + /* Skip over leading slashes. */ while (*slash == '/') slash++; - while ((slash = index (slash, '/'))) + + while (1) { + /* slash points to the leftmost unprocessed component of dirpath. */ + basename_dir = slash; + + slash = strchr (slash, '/'); + if (slash == NULL) + break; + + if (first_subdir) + { + first_subdir = 0; + saved_cwd = !save_cwd (&cwd); + } + + if (!saved_cwd) + basename_dir = dirpath; + *slash = '\0'; - if (stat (dirpath, &stats)) + if (stat (basename_dir, &stats)) { - if (mkdir (dirpath, tmp_mode)) + if (mkdir (basename_dir, tmp_mode)) { - error (0, errno, "cannot make directory `%s'", dirpath); - umask (oldmask); + error (0, errno, "cannot create directory `%s'", dirpath); + CLEANUP; return 1; } else @@ -146,15 +228,17 @@ make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) error (0, 0, verbose_fmt_string, dirpath); if (owner != (uid_t) -1 && group != (gid_t) -1 - && chown (dirpath, owner, group) -#ifdef AFS + && chown (basename_dir, owner, group) +#if defined(AFS) && defined (EPERM) && errno != EPERM #endif ) { error (0, errno, "%s", dirpath); - retval = 1; + CLEANUP; + return 1; } + if (re_protect) { struct ptr_list *new = (struct ptr_list *) @@ -168,7 +252,14 @@ make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) else if (!S_ISDIR (stats.st_mode)) { error (0, 0, "`%s' exists but is not a directory", dirpath); - umask (oldmask); + CLEANUP; + return 1; + } + + if (saved_cwd && chdir (basename_dir) < 0) + { + error (0, errno, "cannot chdir to directory, %s", dirpath); + CLEANUP; return 1; } @@ -180,37 +271,49 @@ make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) slash++; } + if (!saved_cwd) + basename_dir = dirpath; + /* We're done making leading directories. - Make the final component of the path. */ + Create the final component of the path. */ + + /* The path could end in "/." or contain "/..", so test + if we really have to create the directory. */ - if (mkdir (dirpath, mode)) + if (stat (basename_dir, &stats) && mkdir (basename_dir, mode)) { - error (0, errno, "cannot make directory `%s'", dirpath); - umask (oldmask); + error (0, errno, "cannot create directory `%s'", dirpath); + CLEANUP; return 1; } + + /* Done creating directories. Restore original umask. */ + umask (oldmask); + if (verbose_fmt_string != NULL) error (0, 0, verbose_fmt_string, dirpath); if (owner != (uid_t) -1 && group != (gid_t) -1) { - if (chown (dirpath, owner, group) + if (chown (basename_dir, owner, group) #ifdef AFS && errno != EPERM #endif ) { - error (0, errno, "%s", dirpath); + error (0, errno, "cannot chown %s", dirpath); retval = 1; } /* chown may have turned off some permission bits we wanted. */ - if ((mode & 07000) != 0 && chmod (dirpath, mode)) + if ((mode & 07000) != 0 && chmod (basename_dir, mode)) { - error (0, errno, "%s", dirpath); + error (0, errno, "cannot chmod %s", dirpath); retval = 1; } } + CLEANUP_CWD; + /* If the mode for leading directories didn't include owner "wx" privileges, we have to reset their protections to the correct value. */ @@ -228,36 +331,39 @@ make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string) { /* We get here if the entire path already exists. */ + const char *dirpath = argpath; + if (!S_ISDIR (stats.st_mode)) { error (0, 0, "`%s' exists but is not a directory", dirpath); - umask (oldmask); return 1; } - /* chown must precede chmod because on some systems, - chown clears the set[ug]id bits for non-superusers, - resulting in incorrect permissions. - On System V, users can give away files with chown and then not - be able to chmod them. So don't give files away. */ + if (!preserve_existing) + { + /* chown must precede chmod because on some systems, + chown clears the set[ug]id bits for non-superusers, + resulting in incorrect permissions. + On System V, users can give away files with chown and then not + be able to chmod them. So don't give files away. */ - if (owner != (uid_t) -1 && group != (gid_t) -1 - && chown (dirpath, owner, group) + if (owner != (uid_t) -1 && group != (gid_t) -1 + && chown (dirpath, owner, group) #ifdef AFS - && errno != EPERM + && errno != EPERM #endif - ) - { - error (0, errno, "%s", dirpath); - retval = 1; - } - if (chmod (dirpath, mode)) - { - error (0, errno, "%s", dirpath); - retval = 1; + ) + { + error (0, errno, "%s", dirpath); + retval = 1; + } + if (chmod (dirpath, mode)) + { + error (0, errno, "%s", dirpath); + retval = 1; + } } } - umask (oldmask); return retval; }