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#____________________________________________________________________
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# File: Cache.pm
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#____________________________________________________________________
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#
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# Author: Shaun Ashby <Shaun.Ashby@cern.ch>
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# (with contribution from Lassi.Tuura@cern.ch)
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# Update: 2003-11-27 16:45:18+0100
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# Revision: $Id: Cache.pm,v 1.5 2005/08/17 11:20:54 sashby Exp $
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#
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# Copyright: 2003 (C) Shaun Ashby
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#
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#--------------------------------------------------------------------
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=head1 NAME
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Cache::Cache - A generic directory cache object.
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=head1 SYNOPSIS
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my $cacheobject=Cache::Cache->new();
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=head1 DESCRIPTION
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A package to provide caching of directory information. Directory timestamps
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are tracked on further reading of an existing cache and lists of modified
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directories and BuildFiles can be obtained.
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=head1 METHODS
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=over
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=cut
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package Cache::Cache;
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require 5.004;
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use Exporter;
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@ISA=qw(Exporter);
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#
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=item C<new()>
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Create a new Cache::Cache object. The name of the cache is B<DirCache.db> by default.
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=cut
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sub new()
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###############################################################
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# new #
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###############################################################
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# modified : Thu Nov 27 16:45:27 2003 / SFA #
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# params : #
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# : #
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# function : #
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# : #
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###############################################################
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{
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my $proto=shift;
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my $class=ref($proto) || $proto;
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my $self=
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{
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CACHENAME => "DirCache.db", # Name of global file/dir cache;
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BFCACHE => {}, # BuildFile cache;
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DIRCACHE => {}, # Source code cache;
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STATUS => 0, # Status of cache: 1 => something changed. If so, force save;
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VERBOSE => 0 # Verbose mode (0/1);
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};
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bless $self,$class;
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return $self;
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}
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=item C<getdir($path)>
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Return a list of directories starting from $path.
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=cut
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sub getdir()
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{
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my $self=shift;
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my ($path) = @_;
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opendir (DIR, $path) || die "$path: cannot read: $!\n";
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# Skip .admin and CVS subdirectories too.
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# Also skip files that look like backup files or files being modified with emacs:
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my @items = map { "$path/$_" } grep (
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$_ ne "." && $_ ne ".." && $_ ne "CVS" &&
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$_ ne ".admin" && $_ !~ m|\.#*|,
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readdir(DIR)
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);
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closedir (DIR);
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return @items;
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}
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=item C<prune($path)>
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Recursively remove directories from the cache starting at $path.
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=cut
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sub prune()
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{
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my $self=shift;
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my ($path) = @_;
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$self->cachestatus(1);
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return if ! exists $self->{DIRCACHE}->{$path};
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my (undef, undef, @subs) = @{$self->{DIRCACHE}->{$path}};
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delete $self->{DIRCACHE}->{$path};
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foreach my $sub (@subs)
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{
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$self->prune($sub);
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}
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}
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=item C<checktree($path, $required, $dofiles)>
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A timestamp checking routine. Starting from $path, check all timestamps of
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directories and their files. Skip all files unless $dofiles is 1.
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=cut
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sub checktree()
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{
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my ($self, $path, $required, $dofiles) = @_;
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# Check if this path needs to be checked. If it exists, has the same mode
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# and the same time stamp, it's up to date and doesn't need to be checked.
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# Otherwise if it is a directory whose time-stamp has changed, rescan it.
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# If the path has be removed, prune it from the cache. Note that we skip
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# non-directories unless $dofiles is set. Considering only directories is
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# dramatically faster.
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next if ($path =~ /\.admin/); # skip .admin dirs
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next if ($path =~ /.*CVS/);
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# NB: We stat each path only once ever. The special "_" file handle uses
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# the results from the last stat we've made. See man perlfunc/stat.
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if (! stat($path))
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{
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die "$path: $!\n" if $required;
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$self->logmsg("SCRAM: $path: missing: removing from cache\n");
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$self->prune($path);
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# Something changed so force write of cache:
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$self->cachestatus(1);
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return;
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}
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# If the entry in the cache is not the same mode or time, force an update.
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# Otherwise use the cache as the list of items we need to change.
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my $cached = $self->{DIRCACHE}->{$path};
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my @items = ();
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if (! -d _)
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{
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if ($dofiles)
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{
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$self->logmsg("SCRAM: $path: updating cache\n");
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$self->{DIRCACHE}->{$path} = [ (stat(_))[2, 9] ];
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}
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else
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{
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$self->logmsg("SCRAM: $path: not a directory: removing from parent's list\n");
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my $parent = $path;
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$parent =~ s|(.*)/[^/]+$|$1|;
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if ($parent ne $path && exists $self->{DIRCACHE}->{$parent})
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{
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my ($mode, $time, @subs) = @{$self->{DIRCACHE}->{$parent}};
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$self->{DIRCACHE}->{$parent} = [ $mode, $time, grep ($_ ne $path, @subs) ];
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}
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$self->cachestatus(1);
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}
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}
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elsif (! $cached || $cached->[0] != (stat(_))[2])
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{
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# When a directory is added, this block is activated
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$self->added_dirs($path); # Store the newly-added dir
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$self->logmsg("SCRAM: $path: new or changed: pruning and recreating cache\n");
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$self->prune($path);
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$self->{DIRCACHE}->{$path} = [ (stat(_))[2, 9], @items = $self->getdir($path) ];
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$required = 1;
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$self->cachestatus(1);
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}
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elsif ($cached->[1] != (stat(_))[9])
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{
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# When a subdirectory is removed, this block is activated
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#
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# This is a parent directory. We store this as any
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# update can be taken recursively from this dir:
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$self->modified_parentdirs($path);
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$self->logmsg("SCRAM: $path: modified: updating cache\n");
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# Current subdirs:
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@items = $self->getdir($path);
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# Start checking from element number 2:
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for (my $i = 2; $i <= $#$cached; $i++)
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{
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if (! grep($cached->[$i] eq $_, @items))
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{
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# Add the removed path to a store for later access
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# from the project cache. This info is needed to update
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# the cached data:
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$self->schedremoval($cached->[$i]);
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# Remove all child data:
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$self->clean_cache_recursive($cached->[$i]);
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}
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}
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$self->{DIRCACHE}->{$path} = [ (stat(_))[2, 9], @items ];
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$required = 1;
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$self->cachestatus(1);
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}
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else
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{
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$self->logmsg("SCRAM: $path: valid: using cached directory list\n");
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(undef, undef, @items) = @{$self->{DIRCACHE}->{$path}};
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$required = 0;
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}
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# Process sub-directories
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foreach my $item (@items)
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{
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$self->checktree($item, $required, $dofiles);
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}
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}
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=item C<clean_cache_recursive($startdir)>
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Recursive remove cached data for directories under $startdir.
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=cut
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sub clean_cache_recursive()
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{
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my $self=shift;
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my ($startdir) = @_;
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my $children = $self->{DIRCACHE}->{$startdir};
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for (my $i = 2; $i <= $#$children; $i++)
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{
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# Remove all children:
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$self->schedremoval($children->[$i]);
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$self->clean_cache_recursive($children->[$i]);
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}
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delete $self->{DIRCACHE}->{$startdir};
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return $self;
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}
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=item C<dirtree($dir,$dofiles)>
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Starting from $dir, scan the directory tree. Ignore files unless $dofiles is set. This
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function just calls checktree().
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=cut
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sub dirtree()
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{
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my $self=shift;
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my ($dir,$dofiles) = @_;
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# Get the directory tree:
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$self->checktree($dir, 1, $dofiles);
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return $self;
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}
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=item C<checkfiles()>
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Function to actually run the timestamp checks. This is only run from
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SCRAM::CMD::build().
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=cut
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sub checkfiles()
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{
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my $self=shift;
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# Scan config dir for top-level data, then start from src:
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my @scandirs=($ENV{LOCALTOP}."/".$ENV{SCRAM_CONFIGDIR}, $ENV{SCRAM_SOURCEDIR});
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my $dofiles=1;
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# Loop over all directories that need scanning (normally just src and config):
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foreach my $scand (@scandirs)
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{
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$self->logmsg("SCRAM: Scanning $scand [dofiles set to ".$dofiles."]\n");
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# Check the directory tree:
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$self->dirtree($scand, $dofiles);
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$dofiles=0;
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}
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# Mark everything in the cache old:
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map { $_->[0] = 0 } values %{$self->{BFCACHE}};
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map { $_->[0] = 0 } values %{$self->{CONFIGCACHE}};
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# Remember which directories have buildfiles in them:
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my %files = map { -f $_ ? ($_ => [ (stat(_))[9] ]) : () }
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map { "$_/BuildFile" }
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keys %{$self->{DIRCACHE}};
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# Get list of files in config dir:
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my $configcache = {};
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my %configfiles = map { -f $_ &&
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$_ =~ m|$ENV{LOCALTOP}/$ENV{SCRAM_CONFIGDIR}.*?$|
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? ($_ => [ (stat(_))[9] ]) : () } keys %{$self->{DIRCACHE}};
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# Also add ToolCache.db to the cache: FIXME: should probably use aglob here so
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# that all SCRAM_ARCHs are taken into account.
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$configfiles{$ENV{LOCALTOP}."/.SCRAM/".$ENV{SCRAM_ARCH}."/ToolCache.db"} =
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[ (stat($ENV{LOCALTOP}."/.SCRAM/".$ENV{SCRAM_ARCH}."/ToolCache.db"))[9] ];
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# Compare or add to config file cache. We need this to be separate so we can tell if a
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# file affecting our build has been changed:
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while (my ($path, $vals) = each %configfiles)
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{
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if ($self->{CONFIGCACHE}->{$path} && $self->{CONFIGCACHE}->{$path}[1] == $vals->[0])
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{
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$configcache->{$path} = $self->{CONFIGCACHE}->{$path};
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delete $self->{CONFIGCACHE}->{$path};
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}
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else
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{
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$self->{STATUSCONFIG}=1;
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$self->logmsg("SCRAM: $path: changed\n");
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$configcache->{$path} = [ 1, @$vals ];
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delete $self->{CONFIGCACHE}->{$path};
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}
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}
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# Compare with existing cache: remove from cache what no longer
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# exists, then check which build files are newer than the cache.
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my $newcache = {};
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while (my ($path, $vals) = each %files)
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{
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if ($self->{BFCACHE}->{$path} && $self->{BFCACHE}->{$path}[1] == $vals->[0])
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{
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$newcache->{$path} = $self->{BFCACHE}->{$path};
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delete $self->{BFCACHE}->{$path};
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}
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else
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{
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$self->{STATUSSRC}=1;
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$self->logmsg("SCRAM: $path: changed\n");
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$newcache->{$path} = [ 1, @$vals ];
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delete $self->{BFCACHE}->{$path};
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}
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}
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# If there were BuildFiles that were removed, force update of cache
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# and remove the BUILDFILEDATA entries:
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foreach my $path (keys %{$self->{BFCACHE}})
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{
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| 349 |
$self->logmsg("SCRAM: $path: removed. Build data will be removed from build cache.\n");
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| 350 |
$self->cachestatus(1);
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# Store this so that later, we can tell the BuildDataStore to remove it:
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$self->schedremoval($path);
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}
|
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# Save the BuildFile cache:
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delete $self->{BFCACHE};
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| 357 |
$self->{BFCACHE} = $newcache;
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| 359 |
# Save the config cache:
|
| 360 |
delete $self->{CONFIGCACHE};
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| 361 |
$self->{CONFIGCACHE} = $configcache;
|
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return $self;
|
| 363 |
}
|
| 364 |
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=item C<dircache()>
|
| 366 |
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| 367 |
Return a reference to the directory cache hash.
|
| 368 |
|
| 369 |
=cut
|
| 370 |
|
| 371 |
sub dircache()
|
| 372 |
{
|
| 373 |
my $self=shift;
|
| 374 |
# Return the file cache:
|
| 375 |
return $self->{DIRCACHE};
|
| 376 |
}
|
| 377 |
|
| 378 |
=item C<added_dirs($path)>
|
| 379 |
|
| 380 |
Add $path to the list of directories added since last scan, or return
|
| 381 |
the list of added directories if no argument given.
|
| 382 |
|
| 383 |
=cut
|
| 384 |
|
| 385 |
sub added_dirs()
|
| 386 |
{
|
| 387 |
my $self=shift;
|
| 388 |
my ($path) = @_;
|
| 389 |
|
| 390 |
# If we have a path to add, add it.
|
| 391 |
if ($path)
|
| 392 |
{
|
| 393 |
if (exists($self->{ADDEDDIRS}))
|
| 394 |
{
|
| 395 |
push(@{$self->{ADDEDDIRS}}, $path);
|
| 396 |
}
|
| 397 |
else
|
| 398 |
{
|
| 399 |
$self->{ADDEDDIRS} = [ $path ];
|
| 400 |
}
|
| 401 |
}
|
| 402 |
else
|
| 403 |
{
|
| 404 |
# Otherwise, return the array of added dirs:
|
| 405 |
my @addeddirs = @{$self->{ADDEDDIRS}};
|
| 406 |
delete $self->{ADDEDDIRS};
|
| 407 |
return \@addeddirs;
|
| 408 |
}
|
| 409 |
}
|
| 410 |
|
| 411 |
=item C<modified_parentdirs($path)>
|
| 412 |
|
| 413 |
Add a directory $path to the list of parent directories (directories
|
| 414 |
having subdirectories), or return a reference to the list.
|
| 415 |
Storing this parent allows any update to be taken recursively from this
|
| 416 |
location.
|
| 417 |
|
| 418 |
=cut
|
| 419 |
|
| 420 |
sub modified_parentdirs()
|
| 421 |
{
|
| 422 |
my $self=shift;
|
| 423 |
my ($path) = @_;
|
| 424 |
|
| 425 |
# If we have a path to add, add it.
|
| 426 |
# Don't bother if it's the main source dir as we don't
|
| 427 |
# want to rescan everything from src (that would be silly):
|
| 428 |
if ($path && $path ne $ENV{SCRAM_SOURCEDIR})
|
| 429 |
{
|
| 430 |
if (exists($self->{MODPARENTDIRS}))
|
| 431 |
{
|
| 432 |
push(@{$self->{MODPARENTDIRS}}, $path);
|
| 433 |
}
|
| 434 |
else
|
| 435 |
{
|
| 436 |
$self->{MODPARENTDIRS} = [ $path ];
|
| 437 |
}
|
| 438 |
}
|
| 439 |
else
|
| 440 |
{
|
| 441 |
# Otherwise, return the array of added dirs:
|
| 442 |
my @moddeddirs = @{$self->{MODPARENTDIRS}};
|
| 443 |
delete $self->{MODPARENTDIRS};
|
| 444 |
return \@moddeddirs;
|
| 445 |
}
|
| 446 |
}
|
| 447 |
|
| 448 |
=item C<schedremoval($d)>
|
| 449 |
|
| 450 |
Add directory $d to list of directories that should be removed
|
| 451 |
recursively from the cache.
|
| 452 |
If no arguments given, return a reference to a list of
|
| 453 |
directories to be removed.
|
| 454 |
|
| 455 |
=cut
|
| 456 |
|
| 457 |
sub schedremoval()
|
| 458 |
{
|
| 459 |
my $self=shift;
|
| 460 |
my ($d)=@_;
|
| 461 |
|
| 462 |
if ($d)
|
| 463 |
{
|
| 464 |
if (exists($self->{REMOVEDATA}))
|
| 465 |
{
|
| 466 |
push(@{$self->{REMOVEDATA}},$d);
|
| 467 |
}
|
| 468 |
else
|
| 469 |
{
|
| 470 |
$self->{REMOVEDATA} = [ $d ];
|
| 471 |
}
|
| 472 |
}
|
| 473 |
else
|
| 474 |
{
|
| 475 |
my $remove = [ @{$self->{REMOVEDATA}} ];
|
| 476 |
$self->{REMOVEDATA} = [];
|
| 477 |
return $remove;
|
| 478 |
}
|
| 479 |
}
|
| 480 |
|
| 481 |
=item C<filestatus()>
|
| 482 |
|
| 483 |
Return a true or false value depending on whether
|
| 484 |
a BuildFile was changed or not.
|
| 485 |
|
| 486 |
=cut
|
| 487 |
|
| 488 |
sub filestatus()
|
| 489 |
{
|
| 490 |
my $self=shift;
|
| 491 |
# Here we want to return a true or false value depending on whether
|
| 492 |
# or not a buildfile was changed:
|
| 493 |
return $self->{STATUSSRC};
|
| 494 |
}
|
| 495 |
|
| 496 |
=item C<configstatus()>
|
| 497 |
|
| 498 |
Return a true or false value depending on whether
|
| 499 |
a file in the config directory was changed or not.
|
| 500 |
|
| 501 |
=cut
|
| 502 |
|
| 503 |
sub configstatus()
|
| 504 |
{
|
| 505 |
my $self=shift;
|
| 506 |
# Here we want to return a true or false value depending on whether or not a file
|
| 507 |
# in config dir was changed:
|
| 508 |
return $self->{STATUSCONFIG};
|
| 509 |
}
|
| 510 |
|
| 511 |
=item C<bf_for_scanning()>
|
| 512 |
|
| 513 |
Return a list of BuildFiles to re-read. Note that this is only done
|
| 514 |
if the status was changed (i.e. not necessary to read through the list
|
| 515 |
of BuildFiles to know whether something changed as the flag B<STATUSSRC>
|
| 516 |
is set as the source tree is checked).
|
| 517 |
If B<STATUSCONFIG> is true, all BuildFiles are marked to be read.
|
| 518 |
|
| 519 |
=cut
|
| 520 |
|
| 521 |
sub bf_for_scanning()
|
| 522 |
{
|
| 523 |
my $self=shift;
|
| 524 |
my $MODIFIED = [];
|
| 525 |
|
| 526 |
$self->{STATUSSRC} = 0;
|
| 527 |
|
| 528 |
# Return a list of buildfiles to be reread. Note that we only do this
|
| 529 |
# if the status was changed (i.e. don't have to read through the list of BFs to know
|
| 530 |
# whether something changed as the flags STATUSSRC is set as the src tree is checked).
|
| 531 |
# Also we check to see if STATUSCONFIG is true. If so all BuildFiles are marked to be read:
|
| 532 |
if ($self->{STATUSCONFIG})
|
| 533 |
{
|
| 534 |
$self->{STATUSCONFIG} = 0;
|
| 535 |
# Return all the buildfiles since they'll all to be read:
|
| 536 |
return [ keys %{$self->{BFCACHE}} ];
|
| 537 |
}
|
| 538 |
else
|
| 539 |
{
|
| 540 |
# Only return the files that changed:
|
| 541 |
map { ( $self->{BFCACHE}{$_}->[0] == 1 ) && push(@$MODIFIED, $_) } keys %{$self->{BFCACHE}};
|
| 542 |
# Reset the flag:
|
| 543 |
$self->{STATUSCONFIG} = 0;
|
| 544 |
}
|
| 545 |
return $MODIFIED;
|
| 546 |
}
|
| 547 |
|
| 548 |
=item C<paths()>
|
| 549 |
|
| 550 |
Return a reference to an array of directories for the current source tree.
|
| 551 |
|
| 552 |
=cut
|
| 553 |
|
| 554 |
sub paths()
|
| 555 |
{
|
| 556 |
my $self=shift;
|
| 557 |
my $paths = {};
|
| 558 |
|
| 559 |
$self->{ALLDIRS} = [];
|
| 560 |
|
| 561 |
# Pass over each dir, skipping those that are not wanted and
|
| 562 |
# storing those that are relevant to an array:
|
| 563 |
foreach my $path (keys %{$self->{DIRCACHE}})
|
| 564 |
{
|
| 565 |
if ( ! -d $path && $path != m|$ENV{LOCALTOP}/$ENV{SCRAM_CONFIGDIR}.*?$|)
|
| 566 |
{
|
| 567 |
$self->logmsg("SCRAM: $path no longer exists. Clearing from cache.\n");
|
| 568 |
$self->cachestatus(1);
|
| 569 |
delete $self->{DIRCACHE}->{$path};
|
| 570 |
}
|
| 571 |
else
|
| 572 |
{
|
| 573 |
next if $path =~ m|/CVS$|; # Ignore CVS directories.
|
| 574 |
next if $path =~ m|/\.admin$|; # Ignore .admin directories.
|
| 575 |
next if $path =~ m|\Q$ENV{LOCALTOP}/$ENV{SCRAM_CONFIGDIR}\L|;
|
| 576 |
push(@{$self->{ALLDIRS}},$path);
|
| 577 |
}
|
| 578 |
}
|
| 579 |
|
| 580 |
# Return the array:
|
| 581 |
return $self->{ALLDIRS};
|
| 582 |
}
|
| 583 |
|
| 584 |
=item C<verbose()>
|
| 585 |
|
| 586 |
Turn verbosity for the cache on or off.
|
| 587 |
|
| 588 |
=cut
|
| 589 |
|
| 590 |
sub verbose()
|
| 591 |
{
|
| 592 |
my $self=shift;
|
| 593 |
# Turn on verbose mode:
|
| 594 |
@_ ? $self->{VERBOSE} = shift
|
| 595 |
: $self->{VERBOSE}
|
| 596 |
}
|
| 597 |
|
| 598 |
=item C<cachestatus()>
|
| 599 |
|
| 600 |
Set or return the cache status to indicate whether or not a file
|
| 601 |
timestamp has changed since the last pass.
|
| 602 |
|
| 603 |
=cut
|
| 604 |
|
| 605 |
sub cachestatus()
|
| 606 |
{
|
| 607 |
my $self=shift;
|
| 608 |
# Set/return the status of the cache:
|
| 609 |
@_ ? $self->{STATUS} = shift
|
| 610 |
: $self->{STATUS}
|
| 611 |
}
|
| 612 |
|
| 613 |
=item C<logmsg(@message)>
|
| 614 |
|
| 615 |
Print a message to B<STDERR>. This is only used in
|
| 616 |
checktree(), checkfiles() and paths().
|
| 617 |
|
| 618 |
=cut
|
| 619 |
|
| 620 |
sub logmsg()
|
| 621 |
{
|
| 622 |
my $self=shift;
|
| 623 |
# Print a message to STDOUT if VERBOSE is true:
|
| 624 |
print STDERR @_ if $self->verbose();
|
| 625 |
}
|
| 626 |
|
| 627 |
=item C<name()>
|
| 628 |
|
| 629 |
Set or return the name of the cache. Normally set
|
| 630 |
to B<DirCache.db> (and not architecture dependent).
|
| 631 |
|
| 632 |
=cut
|
| 633 |
|
| 634 |
sub name()
|
| 635 |
{
|
| 636 |
my $self=shift;
|
| 637 |
# Set/return the name of the cache to use:
|
| 638 |
@_ ? $self->{CACHENAME} = shift
|
| 639 |
: $self->{CACHENAME}
|
| 640 |
}
|
| 641 |
|
| 642 |
1;
|
| 643 |
|
| 644 |
=back
|
| 645 |
|
| 646 |
=head1 AUTHOR
|
| 647 |
|
| 648 |
Shaun Ashby (with contribution from Lassi Tuura)
|
| 649 |
|
| 650 |
=head1 MAINTAINER
|
| 651 |
|
| 652 |
Shaun Ashby
|
| 653 |
|
| 654 |
=cut
|
| 655 |
|
