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1 | package File::CheckTree; |
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2 | |
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3 | use 5.006; |
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4 | use Cwd; |
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5 | use Exporter; |
6 | use File::Spec; |
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7 | use warnings; |
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8 | use strict; |
9 | |
10 | our $VERSION = '4.2'; |
11 | our @ISA = qw(Exporter); |
12 | our @EXPORT = qw(validate); |
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13 | |
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14 | =head1 NAME |
15 | |
16 | validate - run many filetest checks on a tree |
17 | |
18 | =head1 SYNOPSIS |
19 | |
20 | use File::CheckTree; |
21 | |
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22 | $num_warnings = validate( q{ |
23 | /vmunix -e || die |
24 | /boot -e || die |
25 | /bin cd |
26 | csh -ex |
27 | csh !-ug |
28 | sh -ex |
29 | sh !-ug |
30 | /usr -d || warn "What happened to $file?\n" |
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31 | }); |
32 | |
33 | =head1 DESCRIPTION |
34 | |
35 | The validate() routine takes a single multiline string consisting of |
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36 | directives, each containing a filename plus a file test to try on it. |
37 | (The file test may also be a "cd", causing subsequent relative filenames |
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38 | to be interpreted relative to that directory.) After the file test |
39 | you may put C<|| die> to make it a fatal error if the file test fails. |
40 | The default is C<|| warn>. The file test may optionally have a "!' prepended |
41 | to test for the opposite condition. If you do a cd and then list some |
42 | relative filenames, you may want to indent them slightly for readability. |
43 | If you supply your own die() or warn() message, you can use $file to |
44 | interpolate the filename. |
45 | |
46 | Filetests may be bunched: "-rwx" tests for all of C<-r>, C<-w>, and C<-x>. |
47 | Only the first failed test of the bunch will produce a warning. |
48 | |
49 | The routine returns the number of warnings issued. |
50 | |
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51 | =head1 AUTHOR |
52 | |
53 | Unknown. Revised by Paul Grassie <F<grassie@perl.com>> in 2002. |
54 | |
55 | =head1 HISTORY |
56 | |
57 | File::CheckTree used to not display fatal error messages. |
58 | It used to count only those warnings produced by a generic C<|| warn> |
59 | (and not those in which the user supplied the message). In addition, |
60 | the validate() routine would leave the user program in whatever |
61 | directory was last entered through the use of "cd" directives. |
62 | These bugs were fixed during the development of perl 5.8. |
63 | The first fixed version of File::CheckTree was 4.2. |
64 | |
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65 | =cut |
66 | |
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67 | my $Warnings; |
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68 | |
69 | sub validate { |
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70 | my ($starting_dir, $file, $test, $cwd, $oldwarnings); |
71 | |
72 | $starting_dir = cwd; |
73 | |
74 | $cwd = ""; |
75 | $Warnings = 0; |
76 | |
77 | foreach my $check (split /\n/, $_[0]) { |
78 | my ($testlist, @testlist); |
79 | |
80 | # skip blanks/comments |
81 | next if $check =~ /^\s*#/ || $check =~ /^\s*$/; |
82 | |
83 | # Todo: |
84 | # should probably check for invalid directives and die |
85 | # but earlier versions of File::CheckTree did not do this either |
86 | |
87 | # split a line like "/foo -r || die" |
88 | # so that $file is "/foo", $test is "-rwx || die" |
89 | ($file, $test) = split(' ', $check, 2); # special whitespace split |
90 | |
91 | # change a $test like "!-ug || die" to "!-Z || die", |
92 | # capturing the bundled tests (e.g. "ug") in $2 |
93 | if ($test =~ s/ ^ (!?-) (\w{2,}) \b /$1Z/x) { |
94 | $testlist = $2; |
95 | # split bundled tests, e.g. "ug" to 'u', 'g' |
96 | @testlist = split(//, $testlist); |
97 | } |
98 | else { |
99 | # put in placeholder Z for stand-alone test |
100 | @testlist = ('Z'); |
101 | } |
102 | |
103 | # will compare these two later to stop on 1st warning w/in a bundle |
104 | $oldwarnings = $Warnings; |
105 | |
106 | foreach my $one (@testlist) { |
107 | # examples of $test: "!-Z || die" or "-w || warn" |
108 | my $this = $test; |
109 | |
110 | # expand relative $file to full pathname if preceded by cd directive |
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111 | $file = File::Spec->catfile($cwd, $file) |
112 | if $cwd && !File::Spec->file_name_is_absolute($file); |
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113 | |
114 | # put filename in after the test operator |
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115 | $this =~ s/(-\w\b)/$1 "\$file"/g; |
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116 | |
117 | # change the "-Z" representing a bundle with the $one test |
118 | $this =~ s/-Z/-$one/; |
119 | |
120 | # if it's a "cd" directive... |
121 | if ($this =~ /^cd\b/) { |
122 | # add "|| die ..." |
123 | $this .= ' || die "cannot cd to $file\n"'; |
124 | # expand "cd" directive with directory name |
125 | $this =~ s/\bcd\b/chdir(\$cwd = '$file')/; |
126 | } |
127 | else { |
128 | # add "|| warn" as a default disposition |
129 | $this .= ' || warn' unless $this =~ /\|\|/; |
130 | |
131 | # change a generic ".. || die" or ".. || warn" |
132 | # to call valmess instead of die/warn directly |
133 | # valmess will look up the error message from %Val_Message |
134 | $this =~ s/ ^ ( (\S+) \s+ \S+ ) \s* \|\| \s* (die|warn) \s* $ |
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135 | /$1 || valmess('$3', '$2', \$file)/x; |
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136 | } |
137 | |
138 | { |
139 | # count warnings, either from valmess or '-r || warn "my msg"' |
140 | # also, call any pre-existing signal handler for __WARN__ |
141 | my $orig_sigwarn = $SIG{__WARN__}; |
142 | local $SIG{__WARN__} = sub { |
143 | ++$Warnings; |
144 | if ( $orig_sigwarn ) { |
145 | $orig_sigwarn->(@_); |
146 | } |
147 | else { |
148 | warn "@_"; |
149 | } |
150 | }; |
151 | |
152 | # do the test |
153 | eval $this; |
154 | |
155 | # re-raise an exception caused by a "... || die" test |
156 | if ($@) { |
157 | # in case of any cd directives, return from whence we came |
158 | if ($starting_dir ne cwd) { |
159 | chdir($starting_dir) || die "$starting_dir: $!"; |
160 | } |
161 | die $@ if $@; |
162 | } |
163 | } |
164 | |
165 | # stop on 1st warning within a bundle of tests |
166 | last if $Warnings > $oldwarnings; |
167 | } |
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168 | } |
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169 | |
170 | # in case of any cd directives, return from whence we came |
171 | if ($starting_dir ne cwd) { |
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172 | chdir($starting_dir) || die "chdir $starting_dir: $!"; |
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173 | } |
174 | |
175 | return $Warnings; |
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176 | } |
177 | |
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178 | my %Val_Message = ( |
179 | 'r' => "is not readable by uid $>.", |
180 | 'w' => "is not writable by uid $>.", |
181 | 'x' => "is not executable by uid $>.", |
182 | 'o' => "is not owned by uid $>.", |
183 | 'R' => "is not readable by you.", |
184 | 'W' => "is not writable by you.", |
185 | 'X' => "is not executable by you.", |
186 | 'O' => "is not owned by you.", |
187 | 'e' => "does not exist.", |
188 | 'z' => "does not have zero size.", |
189 | 's' => "does not have non-zero size.", |
190 | 'f' => "is not a plain file.", |
191 | 'd' => "is not a directory.", |
192 | 'l' => "is not a symbolic link.", |
193 | 'p' => "is not a named pipe (FIFO).", |
194 | 'S' => "is not a socket.", |
195 | 'b' => "is not a block special file.", |
196 | 'c' => "is not a character special file.", |
197 | 'u' => "does not have the setuid bit set.", |
198 | 'g' => "does not have the setgid bit set.", |
199 | 'k' => "does not have the sticky bit set.", |
200 | 'T' => "is not a text file.", |
201 | 'B' => "is not a binary file." |
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202 | ); |
203 | |
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204 | sub valmess { |
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205 | my ($disposition, $test, $file) = @_; |
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206 | my $ferror; |
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207 | |
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208 | if ($test =~ / ^ (!?) -(\w) \s* $ /x) { |
209 | my ($neg, $ftype) = ($1, $2); |
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210 | |
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211 | $ferror = "$file $Val_Message{$ftype}"; |
212 | |
213 | if ($neg eq '!') { |
214 | $ferror =~ s/ is not / should not be / || |
215 | $ferror =~ s/ does not / should not / || |
216 | $ferror =~ s/ not / /; |
217 | } |
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218 | } |
219 | else { |
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220 | $ferror = "Can't do $test $file.\n"; |
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221 | } |
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222 | |
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223 | die "$ferror\n" if $disposition eq 'die'; |
224 | warn "$ferror\n"; |
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225 | } |
226 | |
227 | 1; |