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# Usage:
# require "find.pl";
#
# &find('/foo','/bar');
#
# sub wanted { ... }
# where wanted does whatever you want. $dir contains the
# current directory name, and $_ the current filename within
# that directory. $name contains "$dir/$_". You are cd'ed
# to $dir when the function is called. The function may
# set $prune to prune the tree.
#
# This library is primarily for find2perl, which, when fed
#
# find2perl / -name .nfs\* -mtime +7 -exec rm -f {} \; -o -fstype nfs -prune
#
# spits out something like this
#
# sub wanted {
# /^\.nfs.*$/ &&
# (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
# int(-M _) > 7 &&
# unlink($_)
# ||
# ($nlink || (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_))) &&
# $dev < 0 &&
# ($prune = 1);
# }
#
# Set the variable $dont_use_nlink if you're using AFS, since AFS cheats.
sub find {
chop($cwd = `pwd`);
foreach $topdir (@_) {
(($topdev,$topino,$topmode,$topnlink) = stat($topdir))
|| (warn("Can't stat $topdir: $!\n"), next);
if (-d _) {
if (chdir($topdir)) {
($dir,$_) = ($topdir,'.');
$name = $topdir;
&wanted;
($fixtopdir = $topdir) =~ s,/$,, ;
&finddir($fixtopdir,$topnlink);
}
else {
warn "Can't cd to $topdir: $!\n";
}
}
else {
unless (($dir,$_) = $topdir =~ m#^(.*/)(.*)$#) {
($dir,$_) = ('.', $topdir);
}
$name = $topdir;
chdir $dir && &wanted;
}
chdir $cwd;
}
}
sub finddir {
local($dir,$nlink) = @_;
local($dev,$ino,$mode,$subcount);
local($name);
# Get the list of files in the current directory.
opendir(DIR,'.') || (warn "Can't open $dir: $!\n", return);
local(@filenames) = readdir(DIR);
closedir(DIR);
if ($nlink == 2 && !$dont_use_nlink) { # This dir has no subdirectories.
for (@filenames) {
next if $_ eq '.';
next if $_ eq '..';
$name = "$dir/$_";
$nlink = 0;
&wanted;
}
}
else { # This dir has subdirectories.
$subcount = $nlink - 2;
for (@filenames) {
next if $_ eq '.';
next if $_ eq '..';
$nlink = $prune = 0;
$name = "$dir/$_";
&wanted;
if ($subcount > 0 || $dont_use_nlink) { # Seen all the subdirs?
# Get link count and check for directoriness.
($dev,$ino,$mode,$nlink) = lstat($_) unless $nlink;
if (-d _) {
# It really is a directory, so do it recursively.
if (!$prune && chdir $_) {
&finddir($name,$nlink);
chdir '..';
}
--$subcount;
}
}
}
}
}
1;
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