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#!/usr/bin/perl
use MDK::Common;
@ARGV == 2 or die "merge_users <existing files dir> <new files dir>\n";
my ($existing_dir, $new_dir) = @ARGV;
merge('passwd', 'shadow');
merge('group', 'gshadow');
sub merge {
my ($main, $shadow) = @_;
my @new = cat_("$new_dir/$main");
my %new_ids = map { (split ':')[2] => $_ } @new;
my %names_to_have;
foreach (cat_("$existing_dir/$main")) {
my @l = split ':';
next if $l[0] eq 'nobody' || $l[2] < 500;
if (my $e = $new_ids{$l[2]}) {
$_ eq $e or warn "ERROR: conflicting entries:\n $_ $e";
} else {
push @new, $_;
$names_to_have{$l[0]} = 1;
}
}
my @new_shadow = grep { !/^root:/ } cat_("$new_dir/$shadow");
foreach (cat_("$existing_dir/$shadow")) {
my ($name) = split ':';
if ($name eq 'root') {
unshift @new_shadow, $_;
} elsif ($names_to_have{$name}) {
push @new_shadow, $_;
}
}
if (rename "$existing_dir/$main", "$existing_dir/$main.old") {
output("$existing_dir/$main", @new);
} else {
warn "rename $existing_dir/$main failed: $?\n";
<STDIN>;
}
if (rename "$existing_dir/$shadow", "$existing_dir/$shadow.old") {
output("$existing_dir/$shadow", @new_shadow);
} else {
warn "rename $existing_dir/$shadow failed: $?\n";
<STDIN>;
}
}
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