#!/usr/bin/perl
+# increm
+# Do an incremental backup; ONLY for invocation by full !
+#
+# This file is part of chiark backup, a system for backing up GNU/Linux and
+# other UN*X-compatible machines, as used on chiark.greenend.org.uk.
+#
+# chiark backup is:
+# Copyright (C) 1997-1998,2000-2001 Ian Jackson <ian@chiark.greenend.org.uk>
+# Copyright (C) 1999 Peter Maydell <pmaydell@chiark.greenend.org.uk>
+#
+# This is free software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2, or (at your option) any later version.
+#
+# This is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+# We are invoked by full if the tape description file says that it is
+# for an incremental backup. We expect two commandline argument which
+# is the ID string of the tape to use, and the description (which
+# includes ID and function).
BEGIN {
- $etc= '/etc/backup';
+ $etc= '/etc/chiark-backup';
require "$etc/settings.pl";
require 'backuplib.pl';
}
print "Running incremental onto $tapedesc ...\n" or die $!;
+# Just check that we weren't passed a bogus ID (the tape description
+# file for incrementals is just 'incremental\nend\n')
open T,"$etc/tape.$tapeid" or die "Tape $tapeid not found: $!\n";
close T;
+# This is only used for the 'next FULL backup is X' message at the end.
open NF,"next-full" or die $!;
chomp($next= <NF>);
close NF or die $!;
setstatus "FAILED during incremental";
+# Read the number of the incremental involved
+# (ie, (how many files are already on the tape) - 1)
open A,"increm-advance" or die $!;
chomp($advance= <A>);
close A or die $!;
+# better be a decimal number
$advance =~ m/^\d+$/ or die "$advance ?";
-system "mt -f $ntape rewind"; $? and die $?;
-if ($advance == 1) {
- open TI,">TAPEID" or die $!;
- print TI "$tapeid\n$tapedesc\n" or die $!;
- close TI or die $!;
+# Get a list of all filesystems
+readfsys('all');
+openlog();
- system "tar -b$blocksize -vvcf TAPEID.tar TAPEID"; $? and die $?;
- system "dd if=TAPEID.tar of=$ntape bs=${blocksize}b count=10"; $? and die $?;
+# Rewind the tape and if we are the first incremental on the tape then
+# write the TAPEID record, otherwise skip forward to the correct point.
+# (full will already have checked that this is the right tape before
+# it invoked us, so no need to read the existing TAPEID record first.)
+runsystem("mt -f $ntape rewind");
+if ($advance == 1) {
+ writetapeid($tapeid,$tapedesc);
} else {
- system "mt -f $ntape fsf $advance"; $? and die $?;
+ runsystem("mt -f $ntape fsf $advance");
+ $currenttapefilenumber= $advance;
}
-readfsys('all');
-openlog();
-
sub closepipes () {
close(DUMPOR); close(BUFOR);
close(DUMPOW); close(BUFOW);
+ close(GZOR); close(GZOW);
}
setstatus "PROBLEMS during incremental dump";
for $tf (@fsys) {
+
+ parsefsys();
+ prepfsys();
+
+ $bufir='DUMPOR';
+ $ddcmd= "$nasty dd ibs=$softblocksizebytes obs=$blocksizebytes of=$ntape";
+
pipe(DUMPOR,DUMPOW) or die $!;
pipe(BUFOR,BUFOW) or die $!;
- parsefsys();
- if ($tm ne 'dump') {
- print "Not dumping $atf ($prefix) - not \`dump'.\n" or die $!;
- print LOG "Not dumping $atf ($prefix) - not \`dump'.\n" or die $!;
+
+ $gz= $gzi if length $gzi;
+ if ($gz) {
+ $bufir='GZOR';
+ pipe(GZOR,GZOW) or die $!;
+ $ddcmd .= " conv=sync";
+ }
+
+ if ($tm eq 'dump') {
+ $dumplabel= $pcstr.$atf_print.'$';
+ $dumpcmd= "dump 1Lbfu $dumplabel $softblocksizekb - $atf";
+ } elsif ($tm eq 'gtar') {
+ $dumpcmd= "tar NCcfl $fsidfile $atf - .";
+ } else {
+ pboth("Not dumping $atf_print ($prefix) - not supported.\n");
next;
}
- startprocess '</dev/null','>&DUMPOW',$rstr."dump 1bfu $softblocksizekb - $atf";
- startprocess '<&DUMPOR','>&BUFOW','writebuffer';
- startprocess '<&BUFOR','>/dev/null'
- ,"dd ibs=$softblocksizebytes obs=$blocksizebytes of=$ntape";
+
+ nexttapefile("inc $prefix:$atf_print");
+
+ # Same trick as full uses to do a pipeline whilst keeping track
+ # of all exit statuses:
+ # dump </dev/null | writebuffer | dd >/dev/null
+ startprocess '</dev/null','>&DUMPOW',"$nice ".$rstr.$dumpcmd;
+ if ($gz) {
+ startprocess '<&DUMPOR','>&GZOW',"$nice gzip -v$gz";
+ }
+ startprocess "<&$bufir",'>&BUFOW',"$nasty writebuffer";
+ startprocess '<&BUFOR','>/dev/null',"$nasty $ddcmd";
closepipes();
endprocesses();
+ # advance is a file counter, so it needs to be updated for each
+ # dump we do to tape.
$advance++;
+
+ finfsys();
}
-system "mt -f $tape rewind"; $? and die $?;
+# Rewind the tape, and increment the counter of incremental backups.
+runsystem("mt -f $tape rewind");
open IAN,">increm-advance.new" or die $!;
print IAN "$advance\n" or die $!;
close IAN or die $!;
rename 'increm-advance.new','increm-advance' or die $!;
-print LOG "Next FULL dump tape is $next\n" or die $!;
-print "Next FULL dump tape is $next\n" or die $!;
+pboth("Next FULL dump tape is $next\n");
setstatus "INCREMENTAL successful: $tapedesc, next full is $next";
exit 0;
~ian / chiark-utils.git / blobdiff