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@wopfel
Created June 16, 2018 13:17
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What would you like to do?
Delete old backups
#!/usr/bin/perl
use strict;
use warnings;
use File::Path qw( remove_tree );
# Call it by ./delete-old-hourly-backups DIRNAME
# Keeps exactly 1 backup directory per day
# Assumes the following directory structure below DIRNAME/:
# back-2018-01-15T13_15_00
# back-2018-01-15T14_45_00
# ...
# In fact, it's irrelevant how often the backup was run each day.
# Following the above example, at the end only the newest directory from back-2018-01-15T* is there.
# All other directories from this day will be removed.
# But it doesn't touch the newest 5 days.
my $now = time;
print "Now: $now.\n";
my %backups;
foreach my $dir ( @ARGV ) {
print "# Dir: $dir\n";
opendir( my $dh, $dir );
while ( readdir $dh ) {
next unless /^back-(2...-..-..)T(.._.._..)$/;
my $date = $1;
my $time = $2;
#print "# Subdir: $_\n";
my $age_in_s = $now - (stat "$dir/$_")[10]; # 10 = ctime
#printf "%s: %07d - %07d seconds old\n", $_, $now, $age_in_s;
next if $age_in_s < 3600 * 24 * 5; # Skip newest 5 days
$backups{ $date }{ 'count' }++;
$backups{ $date }{ 'age_in_s' } = $age_in_s;
$backups{ $date }{ 'parent_dir' } = $dir;
push @{ $backups{ $date }{ 'dirs' } }, $_;
}
foreach my $date ( sort keys %backups ) {
my $count = $backups{$date}{'count'};
next if $count <= 1;
print "Date: $date";
print ", count: $count";
print "\n";
my @dirs = sort @{ $backups{ $date }{ 'dirs' } };
my $array_count = scalar @dirs;
next if $array_count != $count; # Double check
print @dirs;
print "\n";
my $parent_dir = $backups{ $date }{ 'parent_dir' };
while ( scalar @dirs > 1 ) {
my $dir2delete = shift @dirs;
print "<<$dir2delete>>\n";
## REMOVE THE COMMENT TO REMOVE THE DIR :-) ## remove_tree( "$parent_dir/$dir2delete" );
}
}
}
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