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annotate lib/fts-cycle.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 (2013-08-08)
parents e542fd46ad6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Detect cycles in file tree walks.
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2
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3 Copyright (C) 2003-2006, 2009-2013 Free Software Foundation, Inc.
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4
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5 Written by Jim Meyering.
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6
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7 This program is free software: you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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19
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20 #include "cycle-check.h"
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21 #include "hash.h"
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22
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23 /* Use each of these to map a device/inode pair to an FTSENT. */
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24 struct Active_dir
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25 {
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26 dev_t dev;
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27 ino_t ino;
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28 FTSENT *fts_ent;
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29 };
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30
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31 static bool
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32 AD_compare (void const *x, void const *y)
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33 {
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34 struct Active_dir const *ax = x;
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35 struct Active_dir const *ay = y;
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36 return ax->ino == ay->ino
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37 && ax->dev == ay->dev;
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38 }
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39
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40 static size_t
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41 AD_hash (void const *x, size_t table_size)
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42 {
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43 struct Active_dir const *ax = x;
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44 return (uintmax_t) ax->ino % table_size;
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45 }
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46
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47 /* Set up the cycle-detection machinery. */
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48
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49 static bool
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50 setup_dir (FTS *fts)
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51 {
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52 if (fts->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL))
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53 {
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54 enum { HT_INITIAL_SIZE = 31 };
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55 fts->fts_cycle.ht = hash_initialize (HT_INITIAL_SIZE, NULL, AD_hash,
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56 AD_compare, free);
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57 if (! fts->fts_cycle.ht)
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58 return false;
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59 }
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60 else
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61 {
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62 fts->fts_cycle.state = malloc (sizeof *fts->fts_cycle.state);
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63 if (! fts->fts_cycle.state)
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64 return false;
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65 cycle_check_init (fts->fts_cycle.state);
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66 }
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67
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68 return true;
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69 }
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70
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71 /* Enter a directory during a file tree walk. */
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72
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73 static bool
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74 enter_dir (FTS *fts, FTSENT *ent)
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75 {
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76 if (fts->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL))
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77 {
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78 struct stat const *st = ent->fts_statp;
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79 struct Active_dir *ad = malloc (sizeof *ad);
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80 struct Active_dir *ad_from_table;
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81
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82 if (!ad)
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83 return false;
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84
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85 ad->dev = st->st_dev;
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86 ad->ino = st->st_ino;
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87 ad->fts_ent = ent;
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88
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89 /* See if we've already encountered this directory.
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90 This can happen when following symlinks as well as
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91 with a corrupted directory hierarchy. */
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92 ad_from_table = hash_insert (fts->fts_cycle.ht, ad);
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93
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94 if (ad_from_table != ad)
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95 {
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96 free (ad);
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97 if (!ad_from_table)
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98 return false;
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99
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100 /* There was an entry with matching dev/inode already in the table.
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101 Record the fact that we've found a cycle. */
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102 ent->fts_cycle = ad_from_table->fts_ent;
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103 ent->fts_info = FTS_DC;
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104 }
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105 }
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106 else
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107 {
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108 if (cycle_check (fts->fts_cycle.state, ent->fts_statp))
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109 {
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110 /* FIXME: setting fts_cycle like this isn't proper.
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111 To do what the documentation requires, we'd have to
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112 go around the cycle again and find the right entry.
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113 But no callers in coreutils use the fts_cycle member. */
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114 ent->fts_cycle = ent;
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115 ent->fts_info = FTS_DC;
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116 }
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117 }
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118
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119 return true;
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120 }
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121
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122 /* Leave a directory during a file tree walk. */
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123
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124 static void
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125 leave_dir (FTS *fts, FTSENT *ent)
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126 {
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127 struct stat const *st = ent->fts_statp;
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128 if (fts->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL))
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129 {
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130 struct Active_dir obj;
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131 void *found;
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132 obj.dev = st->st_dev;
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133 obj.ino = st->st_ino;
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134 found = hash_delete (fts->fts_cycle.ht, &obj);
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135 if (!found)
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136 abort ();
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137 free (found);
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138 }
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139 else
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140 {
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141 FTSENT *parent = ent->fts_parent;
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142 if (parent != NULL && 0 <= parent->fts_level)
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143 CYCLE_CHECK_REFLECT_CHDIR_UP (fts->fts_cycle.state,
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144 *(parent->fts_statp), *st);
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145 }
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146 }
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147
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148 /* Free any memory used for cycle detection. */
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149
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150 static void
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151 free_dir (FTS *sp)
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152 {
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153 if (sp->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL))
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154 {
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155 if (sp->fts_cycle.ht)
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156 hash_free (sp->fts_cycle.ht);
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157 }
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158 else
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159 free (sp->fts_cycle.state);
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160 }