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annotate lib/lstat.c @ 17463:203c036eb0c6

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bootstrap: support checksum utils without a --status option * build-aux/bootstrap: Only look for sha1sum if updating po files. Add sha1 to the list of supported checksum utils since it's now supported through adjustments below. (update_po_files): Remove the use of --status in a way that will suppress all error messages, but since this is only used to minimize updates, it shouldn't cause an issue. Exit early if there is a problem updating the po file checksums. (find_tool): Remove the check for --version support as this is optional as per commit 86186b17. Don't even check for the presence of the command as if that is needed, it's supported through configuring prerequisites in bootstrap.conf. Prompt that when a tool isn't found, one can define an environment variable to add to the hardcoded search list.
author Pádraig Brady <P@draigBrady.com>
date Thu, 08 Aug 2013 11:08:49 +0100
parents e542fd46ad6f
children
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1 /* Work around a bug of lstat on some systems
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2
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3 Copyright (C) 1997-2006, 2008-2013 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* written by Jim Meyering */
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19
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20 /* If the user's config.h happens to include <sys/stat.h>, let it include only
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21 the system's <sys/stat.h> here, so that orig_lstat doesn't recurse to
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22 rpl_lstat. */
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23 #define __need_system_sys_stat_h
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24 #include <config.h>
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25
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26 #if !HAVE_LSTAT
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27 /* On systems that lack symlinks, our replacement <sys/stat.h> already
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28 defined lstat as stat, so there is nothing further to do other than
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29 avoid an empty file. */
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30 typedef int dummy;
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31 #else /* HAVE_LSTAT */
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32
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33 /* Get the original definition of lstat. It might be defined as a macro. */
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34 # include <sys/types.h>
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35 # include <sys/stat.h>
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36 # undef __need_system_sys_stat_h
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37
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38 static int
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39 orig_lstat (const char *filename, struct stat *buf)
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40 {
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41 return lstat (filename, buf);
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42 }
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43
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44 /* Specification. */
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45 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
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46 eliminates this include because of the preliminary #include <sys/stat.h>
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47 above. */
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48 # include "sys/stat.h"
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49
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50 # include <string.h>
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51 # include <errno.h>
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52
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53 /* lstat works differently on Linux and Solaris systems. POSIX (see
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54 "pathname resolution" in the glossary) requires that programs like
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55 'ls' take into consideration the fact that FILE has a trailing slash
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56 when FILE is a symbolic link. On Linux and Solaris 10 systems, the
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57 lstat function already has the desired semantics (in treating
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58 'lstat ("symlink/", sbuf)' just like 'lstat ("symlink/.", sbuf)',
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59 but on Solaris 9 and earlier it does not.
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60
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61 If FILE has a trailing slash and specifies a symbolic link,
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62 then use stat() to get more info on the referent of FILE.
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63 If the referent is a non-directory, then set errno to ENOTDIR
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64 and return -1. Otherwise, return stat's result. */
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65
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66 int
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67 rpl_lstat (const char *file, struct stat *sbuf)
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68 {
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69 size_t len;
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70 int lstat_result = orig_lstat (file, sbuf);
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71
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72 if (lstat_result != 0)
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73 return lstat_result;
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74
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75 /* This replacement file can blindly check against '/' rather than
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76 using the ISSLASH macro, because all platforms with '\\' either
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77 lack symlinks (mingw) or have working lstat (cygwin) and thus do
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78 not compile this file. 0 len should have already been filtered
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79 out above, with a failure return of ENOENT. */
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80 len = strlen (file);
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81 if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
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82 return 0;
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83
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84 /* At this point, a trailing slash is only permitted on
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85 symlink-to-dir; but it should have found information on the
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86 directory, not the symlink. Call stat() to get info about the
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87 link's referent. Our replacement stat guarantees valid results,
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88 even if the symlink is not pointing to a directory. */
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89 if (!S_ISLNK (sbuf->st_mode))
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90 {
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91 errno = ENOTDIR;
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92 return -1;
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93 }
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94 return stat (file, sbuf);
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95 }
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96
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97 #endif /* HAVE_LSTAT */