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#!/usr/bin/env perl
## Copyright © 2008-2009 by Daniel Friesel <derf@derf.homelinux.org>
## License: WTFPL <http://sam.zoy.org/wtfpl>
use strict;
use warnings;
use Getopt::Long;
use Term::ANSIColor;
my $base = $ENV{HOME};
my $msglevel = 0;
my $remove = 0;
my %substitute;
my $linkfile;
my $exit = 0;
if (-f '.links') {
$linkfile = '.links';
} elsif (-f 'links') {
$linkfile = 'links';
} else {
exit(0);
}
GetOptions(
'm|msglevel=i' => \$msglevel,
'p|parameter=s' => \%substitute,
'q|quiet' => sub {$msglevel = 1},
'r|remove' => \$remove,
);
open(my $links, '<', $linkfile) or die("Can't open $linkfile: $!");
while(<$links>) {
chomp;
foreach my $key (keys(%substitute)) {
s/\$$key/$substitute{$key}/g;
}
my ($type, $src, $dst) = split;
next unless ($type eq 'soft' or $type eq 'hard');
if ($remove) {
remove_link($type, $src, $dst);
} elsif ($type eq 'soft') {
check_symlink($src, $dst);
} elsif ($type eq 'hard') {
check_hardlink($src, $dst);
}
}
close($links);
sub remove_link {
my ($type, $src, $dst) = @_;
if (
($type eq 'soft' and -l "$base/$src")
or ($type eq 'hard' and -e "$base/$src" and -e "$base/$dst")
) {
unlink("$base/$src") or warn("cannot unlink $base/$src: $!");
print_format('removed', $src, '', 'red', 1);
}
return;
}
sub check_symlink {
my $src = shift;
my $dst = shift;
mkdirs($src);
if (not -l "$base/$src" and not -e "$base/$src") {
symlink($dst, "$base/$src");
print_format('created', $src, $dst, 'cyan', 1);
}
elsif (-l "$base/$src" and readlink("$base/$src") eq $dst) {
print_format('ok', $src, $dst, 'green', 0);
}
elsif (-l "$base/$src" and readlink("$base/$src") eq "$base/$dst") {
print_format('absolute', $src, $dst, 'yellow', 0);
}
elsif (not -l "$base/$src" and -e "$base/$src") {
print_format('EXISTS', $src, $dst, 'bold red', 2);
}
elsif (-l "$base/$src") {
unlink("$base/$src");
symlink($dst, "$base/$src");
print_format('fixed', $src, $dst, 'cyan', 1);
}
return;
}
sub check_hardlink {
my $src = shift;
my $dst = shift;
mkdirs($src);
if (not -e "$base/$dst") {
print_format('no dest', $src, $dst, 'red bold', 2);
}
elsif (not -f "$base/$src") {
link("$base/$dst", "$base/$src") or warn($!);
print_format('created', $src, $dst, 'cyan', 1);
}
elsif ((stat("$base/$src"))[1] != (stat("$base/$dst"))[1]) {
unlink("$base/$src");
link("$base/$dst", "$base/$src") or warn($!);
print_format('updated', $src, $dst, 'cyan', 1);
}
elsif ((stat("$base/$src"))[1] == (stat("$base/$dst"))[1]) {
print_format('ok', $src, $dst, 'green', 0);
}
return;
}
sub mkdirs {
my $source = shift;
my $path = $base;
my @dirs = split(/\//, $source);
# the last element is the file
pop(@dirs);
foreach(@dirs) {
unless(-d "$path/$_") {
mkdir("$path/$_") or die("Can't create $path/$_: $!");
}
$path .= $_;
}
return;
}
sub print_format {
my ($message, $src, $dst, $color, $level) = @_;
if ($level > 1) {
$exit++;
}
return if ($level < $msglevel);
if (defined($color)) {
printf(colored('%-9s', $color), $message);
} else {
printf('%-9s', $message);
}
printf(" %-15s -> %-15s\n", $src, $dst);
return;
}
exit($exit);
__END__
=head1 NAME
checklinks - create/update links
=head1 SYNOPSIS
B<checklinks> [ I<options> ]
=head1 DESCRIPTION
Create or update links based on a file
=head1 OPTIONS
=over
=item B<-m>, B<--msglevel>=I<level>
Set the level threshold to show status messages.
0 show everything
1 filter "ok" and "absolute" messages
2 filter everything but "EXISTS" and "no dst"
>2 no messages
=item B<-p>, B<--parameter> I<parameter>=I<value>
While reading the links file, replace $I<parameter> with I<value>.
When used in conjuction with ct(1), $package will be set to the current
package's relative path (as seen from $HOME, like C<packages/caretaker>),
and $etc will be set to $package/etc (like C<packages/caretaker/etc>)
=item B<-q>, B<--quiet>
Shortcut for C<< --msglevel=1 >>
=item B<-r>, B<--remove>
Remove all link sources (hardlinks: only if their destination exists)
=back
=head1 OUTPUT
Typical checklinks output might look like this:
ok .zshrc -> packages/zsh/etc/rc
ok .zprofile -> packages/zsh/etc/profile
absolute .zlogin -> packages/zsh/etc/login
created .zlogout -> packages/zsh/etc/logout
ok .zshenv -> packages/zsh/etc/env
The first item is the status, the second the link source (as in, the link),
the third the link target.
The following status messages are possible:
=over
=item ok
The link exists and points to the right file
=item absolute (soft links only)
The link exists and points to the right file, however it is an absolute link
=item fixed (soft links only)
The link pointed to the wrong file and has been corrected
=item updated (hard links only)
The source existed, but was not identical to the target. It has been deleted
and replaced with a link to the target
=item created
The link did not exist and has been created
=item EXISTS (soft links only)
The source already exists, but is not a symlink
=item no dest
The link destination does not exist
=back
=head1 FILES
The symlink definitions are read from the file F<.links> or F<links> in the
current working directory. Each line contains, separated by spaces:
=over
=item the symlink type
This may be one of 'soft' or 'hard', indicating either a symlink or a hardlink.
=item the source
path of the source, i.e. the link. Relative to $HOME
In symlink mode, the source will only be updated if it either does not exist or
already is a symlink. This should prevent accidental data loss.
Note that in hardlink mode, the source will I<always> be deleted unless it is
already the correct hardlink
=item the target
path of the target, i.e. the link's destination.
This is relative to the source. See L<path_resolution>(7)
=back
Lines beginning with an invalid symlink type will be ignored.
Example:
# checklinks --parameter etc=packages/zsh
soft .zshrc $etc/rc
soft .zprofile $etc/profile
soft .zlogin $etc/login
soft .zlogout $etc/logout
soft .zshenv $etc/env
=head1 DIAGNOSTICS
The exit value is the number of files with grave errors
(a status of "EXISTS" or "no dst").
=head1 BUGS
There are no checks whether the symlink target actually exists.
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