3 # Copyright 2006 Ian Jackson <ijackson@chiark.greenend.org.uk>
5 # This script and its documentation (if any) are free software; you
6 # can redistribute it and/or modify them under the terms of the GNU
7 # General Public License as published by the Free Software Foundation;
8 # either version 3, or (at your option) any later version.
10 # chiark-named-conf and its manpage are distributed in the hope that
11 # it will be useful, but WITHOUT ANY WARRANTY; without even the
12 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
13 # PURPOSE. See the GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License along
16 # with this program; if not, consult the Free Software Foundation's
17 # website at www.fsf.org, or the GNU Project website at www.gnu.org.
23 expire-iso8601 [<options>] <number>x<interval> [<number>x<interval> ...]
25 -u<unitlen> <interval> is measured in units of <unitlen> seconds
26 (default is 86400, so <interval> is in days)
27 -s<slop> allow kept items to be <slop> seconds shorter apart than
28 specified; default is 10% of <unitlen>
29 -n do not really delete
30 -r recursive removal (rm -r)
32 /home/ian/junk/expire-iso8601 14x1 4x7
33 uses units of 86400s (1 day) with a slop of 8640
34 it keeps 14 daily items
35 (that is 14 items, dated no less than 86400-8640 apart)
37 (that is 4 items, dated no less than 7*86400-8640 apart)
38 the 14 daily and 7 weekly items may be the same, or not
39 There is no need to sort the list of <number>x<interval> pairs.
44 16 catastrophic failure
51 use DateTime::Format::Strptime;
62 print STDERR "bad usage: $_[0]\n$usage" or die $!;
67 # my $strp = DateTime::Format::Strptime->new();
68 foreach my $f (<[0-9]*>) {
69 if ($f !~ m/^ \d\d\d\d - \d\d - \d\d
70 (?: T \d\d \: \d\d (?: \: \d\d )?
71 (?: [-+] \d{1,2} \:? \d\d )? )? /x) {
72 print STDERR "ignoring $f\n";
74 my @t = Date::Parse::strptime($f);
75 @t = map { $_ // 0 } @t;
78 # my $t = $strp->parse_datetime($f);
80 # my @t = Date::Parse::strptime($f);
81 #print STDERR Dumper(\@t);
83 # $!=0; $?=0; my $t = `date -d '$&' +%s`;
84 # die "date(!) failed on $&: $? $!" if $! || $?;
85 # chomp $t or confess;
86 push @files, { F => $f, T => $t, U => [] };
92 print STDERR "none at all yet!\n";
96 # newest first, which means biggest T
97 @files = sort { $b->{T} <=> $a->{T} || $b->{F} cmp $a->{F} } @files;
98 my $newest_t = $files[0]{T};
99 $_->{A} = ($newest_t - $_->{T}) / $unit foreach @files;
102 push @{$files[0]{U}}, "newest";
104 print DEBUG Dumper(scalar(@files), \@files, \@intervals) if $debug >= 2;
111 my $dmax = $d + $slop;
112 my $spec = $int->{Spec};
113 my $start_age = ($n-1) * $d - $slop;
116 print DEBUG "FLAG $spec sa=$start_age dmax=$dmax\n";
118 # find $i, the youngest which is at least $start_age
120 print DEBUG "i #$i $files[$i]{A}\n";
121 last if $files[$i]{A} >= $start_age;
123 print STDERR "insufficiently old for $spec\n";
130 push @{ $files[$i]{U} }, $spec;
132 # find $j, the closest to $i, preferably no more than $dmax younger
136 # at each point in this loop $j is the next candidate
138 my $dt = $files[$i]{A} - $files[$j]{A};
139 print DEBUG "j #$j $files[$j]{A} dt=$dt\n";
146 print STDERR "insufficiently dense for $spec after $files[$j]{F}\n";
148 print DEBUG "i #$j\n";
156 next unless @{$_->{U}};
157 printf "keep %s for %s - age %.1f\n",
158 $_->{F}, "@{$_->{U}}", $_->{A};
162 printf "remove %s - age %.1f\n",
165 my $r= system 'rm', ($recurse ? ('-r') : ()), "--", $_->{F};
166 die "run rm: $!\n" unless defined($r) && $r >= 0;
172 open DEBUG, ">/dev/null" or die $!;
174 while (@ARGV && $ARGV[0] =~ m/^-/) {
176 last if $_ eq '-' || $_ eq '--';
179 if (s/^-n/-/) { $rm=0; }
180 elsif (s/-r/-/) { $recurse=1; }
181 elsif (s/-D/-/) { $debug++; }
182 elsif (s/-u(\d+)$//) { $unit=$1; }
183 elsif (s/-s(\d+)$//) { $slop=$1; }
184 else { badusage "unknown short option $_" }
186 } elsif (m/^--help$/) {
187 print $usage or die $!;
190 badusage "unknown long option $_"
194 badusage "too few arguments" unless @ARGV;
197 open DEBUG, ">&STDERR" or die $!;
201 $slop //= $unit * 0.1;
204 m/^(\d+)x(\d+)$/ or badusage "bad <number>x<interval> $_";
205 push @intervals, { Spec => $&, N => $1, D => $2 };
210 foreach (@intervals) { flag $_ }