#!/usr/bin/perl
+# full
+# Main backup script - does a full dump or execs increm. Do NOT run directly!
+#
+# 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.
BEGIN {
- $etc= '/etc/backup';
+ $etc= '/etc/chiark-backup';
require "$etc/settings.pl";
require 'backuplib.pl';
}
$|=1;
-print "Configuration check ...\n" or die $!;
-system 'checkallused'; $? and die $?;
+while (@ARGV) {
+ $_= shift @ARGV;
+ if (m/^\-\-no\-reten$/) {
+ $noreten=1;
+ } elsif (m/^\-\-no\-config\-check$/) {
+ $nocheck=1;
+ } else {
+ die "unknown option/argument \`$_'\n";
+ }
+}
+
+# Check to see whether the tape.nn and fsys.nn files are sane.
+# checkallused checks that all the filesystems mounted are in fact
+# dumped in both full and incremental dumps.
+
+openlog();
+
+if (!$nocheck) {
+ setstatus "FAILED configuration check";
+ print "Configuration check ...\n" or die $!;
+ system 'backup-checkallused'; $? and die $?;
+} else {
+ setstatus "FAILED rewinding";
+ rewind_raw();
+}
printdate();
-unlink 'TAPEID';
-system "mt -f $tape rewind"; $? and die $?;
-system "mt -f $tape setblk $blocksizebytes"; $? and die $?;
-system "dd if=$tape bs=${blocksize}b count=10 | tar -b$blocksize -vvxf - TAPEID";
+setstatus "FAILED reading TAPEID";
+# Try to read the tape ID from the tape into the file TAPEID
+
+readtapeid_raw();
setstatus "FAILED during startup";
+# We need some ID; if the tape has one already that takes precedence;
+# otherwise the user might have set a tape ID that this should be
+# by creating really-TAPEID.
if (open T, "TAPEID") {
unlink 'really-TAPEID';
} elsif (open T, "really-TAPEID") {
die "No TAPEID.\n";
}
+# read the ID; it had better be a non-empty string of alphanumeric chars.
chomp($tapeid= <T>);
$tapeid =~ m/[^0-9a-zA-Z]/ and die "Bad TAPEID ($&).\n";
$tapeid =~ m/[0-9a-zA-Z]/ or die "Empty TAPEID.\n";
setstatus "FAILED at tape identity check";
+# We don't let the user overwrite the tape used for the last backup.
if (open L, "last-tape") {
chomp($lasttape= <L>);
close L;
die "Tape $tapeid same as last time.\n" if $tapeid eq $lasttape;
+# $tapeid identifies the individual tape; $tapedesc is its current
+# identity and function, for printing in messages. You can make these
+# namespaces the same if you like, or you can make the tape.<tapeid>
+# files be links to tape.<tapedesc> files.
if (defined($tapedesc= readlink "$etc/tape.$tapeid")) {
$tapedesc =~ s/^.*\.//;
$tapedesc .= "($tapeid)";
$tapedesc = $tapeid;
}
+# Parse the appropriate tape.nn file.
+# Format is: empty lines and lines starting '#' are ignored. Trailing
+# whitespace is ignored. File must end with 'end' on a line by itself.
+# Either there should be a line 'incremental' to indicate that this is
+# a tape for incremental backups, or a pair of lines 'filesystems fsg'
+# and 'next tapeid', indicating that this tape is part of a full
+# backup, containing the filesystem group fsg.
undef $fsys;
open D, "$etc/tape.$tapeid" or die "Unknown tape $tapeid ($!).\n";
for (;;) {
}
close D or die $!;
+# Incremental backups are handled by increm, not us.
if ($incremental) {
die "incremental tape $tapeid has next or filesystems\n"
if defined($next) || defined($fsys);
die $!;
}
+# Read the filesystem group definition (file fsys.nnn)
readfsys("$fsys");
-openlog();
$doing= "dump of $fsys to tape $tapedesc in drive $tape";
print LOG "$doing:\n" or die $!;
-open T, ">TAPEID" or die $!;
-print T "$tapeid\n$tapedesc\n" or die $!;
-close T or die $!;
+if (!$noreten) {
+ setstatus "FAILED retensioning";
+ runsystem("mt -f $tape reten");
+}
+
+setstatus "FAILED writing tape ID";
+# First write the tape ID to this tape.
-system "tar -b$blocksize -vvcf TAPEID.tar TAPEID"; $? and die $?;
-system "dd if=TAPEID.tar of=$ntape bs=${blocksize}b count=10"; $? and die $?;
+writetapeid($tapeid,$tapedesc);
unlink 'this-md5sums';
print "Doing $doing ...\n" or die $!;
unlink 'p';
-system 'mknod p p'; $? and die $?;
+system 'mknod -m600 p p'; $? and die $?;
setstatus "FAILED during dump";
sub closepipes () {
close(DUMPOR); close(TEEOR); close(BUFOR); close(FINDOR);
close(DUMPOW); close(TEEOW); close(BUFOW); close(FINDOW);
+ close(GZOR); close(GZOW);
+ close(DDERRR); close(DDERRW);
+}
+
+# work out a find option string that will exclude the required files
+# Note that dump pays no attention to exclude options.
+$exclopt = '';
+foreach $exc (@excldir) {
+ $exclopt .= "-regex $exc -prune -o ";
+}
+foreach $exc (@excl) {
+ $exclopt .= "-regex $exc -o ";
}
+# For each filesystem to be put on this tape:
for $tf (@fsys) {
printdate();
+ parsefsys();
+ prepfsys();
+
pipe(FINDOR,FINDOW) or die $!;
pipe(DUMPOR,DUMPOW) or die $!;
pipe(TEEOR,TEEOW) or die $!;
+ pipe(TEEOR,TEEOW) or die $!;
pipe(BUFOR,BUFOW) or die $!;
- parsefsys();
+ pipe(DDERRR,DDERRW) or die $!;
+
+ $bufir='TEEOR';
+ $ddcmd= "dd ibs=$softblocksizebytes obs=$blocksizebytes of=$ntape 2>&1";
+
+ if ($gz) {
+ $bufir='GZOR';
+ pipe(GZOR,GZOW) or die $!;
+ $ddcmd .= " conv=sync";
+ }
+
+ nexttapefile("full $prefix:$atf_print");
+
+ # We can back up via dump or cpio or zafio
+ $dumpin= '</dev/null';
if ($tm eq 'dump') {
- $dumpcmd= "dump 0bfu $softblocksizekb - $atf";
- $dumpin= '</dev/null';
- } else {
+ $dumplabel= $pcstr.$atf_print.'$';
+ $dumpcmd= "dump 0Lbfu $dumplabel $softblocksizekb - $atf";
+ } elsif ($tm eq 'cpio') {
startprocess '</dev/null','>&FINDOW',$rstr."find $atf -xdev -noleaf -print0";
$dumpcmd= "cpio -Hustar -o0C$softblocksizebytes";
$dumpin= '<&FINDOR';
+ } elsif ($tm eq 'zafio') {
+ # compress-each-file-then-archive using afio
+ startprocess '</dev/null','>&FINDOW',$rstr."find $atf -xdev -noleaf $exclopt -print";
+ # don't use verbose flag as this generates 2MB report emails :->
+ $dumpcmd = "afio -b $softblocksizebytes -Zo -";
+ $dumpin = '<&FINDOR';
+ } elsif ($tm eq 'ntfsimage') {
+ $dumpcmd= "ntfsimage -svvf --dirty $dev";
+ } elsif ($tm eq 'gtar') {
+ execute("$rstr touch $fsidfile+new");
+ $dumpcmd= "tar Ccfl $atf - .";
+ } else {
+ die "unknown method $tm for $prefix:$atf_print\n";
}
- startprocess '<p','>>this-md5sums','md5sum';
- startprocess $dumpin,'>&DUMPOW',$rstr.$dumpcmd;
- startprocess '<&DUMPOR','>&TEEOW','tee p';
- startprocess '<&TEEOR','>&BUFOW','writebuffer';
- startprocess '<&BUFOR','>/dev/null'
- ,"dd ibs=$softblocksizebytes obs=$blocksizebytes of=$ntape";
+ # This is a funky way of doing a pipeline which pays attention
+ # to the exit status of all the commands in the pipeline.
+ # It is roughly equivalent to:
+ # md5sum <p >>this-md5sums
+ # dump <$dumpin | tee p [| gzip] | writebuffer | dd >/dev/null
+
+ startprocess '<p','>>this-md5sums',"$nice md5sum";
+ startprocess $dumpin,'>&DUMPOW',"$nice ".$rstr.$dumpcmd;
+ startprocess '<&DUMPOR','>&TEEOW',"$nice tee p";
+ if ($gz) {
+ startprocess '<&TEEOR','>&GZOW',"$nice gzip -v$gz";
+ }
+ startprocess "<&$bufir",'>&BUFOW',"$nasty writebuffer";
+ startprocess '<&DDERRR','>/dev/null',"$nice tee dderr >&2";
+ startprocess '<&BUFOR','>&DDERRW',"$nasty $ddcmd";
closepipes();
endprocesses();
+
+ open DDERR, "dderr" or die $!;
+ defined(read DDERR,$_,1023) or die $!;
+ close DDERR;
+ m/\n(\d+)\+0 records out\n/ or die ">$dderr< ?";
+ push @tapefilesizes, [ $1, $currenttapefilename ];
+ $totalrecords += $1;
+ pboth("total blocks written so far: $totalrecords\n");
+
+ if ($tm eq 'gtar') {
+ execute("$rstr mv -f $fsidfile+new $fsidfile");
+ }
+
+ finfsys();
}
+# The backup should now be complete; verify it
+
setstatus "FAILED during check";
-system "mt -f $tape rewind"; $? and die $?;
-system "mt -f $ntape fsf 1"; $? and die $?;
+# Rewind the tape and skip the TAPEID record
+runsystem("mt -f $tape rewind");
+runsystem("mt -f $ntape fsf 1");
+# Check the md5sums match for each filesystem on the tape
open S,"this-md5sums" or die $!;
for $tf (@fsys) {
printdate();
- chomp($orgsum= <S>);
+ parsefsys();
+ chomp($orgsum= <S>); $orgsum =~ s/\ +\-?$//;
$orgsum =~ m/^[0-9a-fA-F]{32}$/i or die "orgsum \`$orgsum' ?";
- chomp($csum= `readbuffer <$ntape | md5sum`);
+ $cmd= "$nasty dd if=$ntape ibs=$blocksizebytes";
+ $cmd .= " | $nasty readbuffer";
+ $cmd .= " | $nice gzip -vd" if $gz;
+ $cmd .= " | $nice md5sum";
+ pboth(" $cmd\n");
+ chomp($csum= `$cmd`);
+ $csum =~ s/\ +\-?$//;
$orgsum eq $csum or die "MISMATCH $tf $csum $orgsum\n";
print "checksum ok $csum\t$tf\n" or die $!;
print LOG "checksum ok $csum\t$tf\n" or die $!;
}
printdate();
-system "mt -f $tape rewind"; $? and die $?;
+runsystem("mt -f $tape rewind");
setstatus "FAILED during cleanup";
+$summary= '';
+foreach $tfs (@tapefilesizes) {
+ $summary .= sprintf " %10d blocks for %s\n", $tfs->[0], $tfs->[1]
+}
+$summary .=
+ sprintf " %10d blocks total (of %d bytes) plus TAPEID and headers\n",
+ $totalrecords, $blocksizebytes;
+
+pboth("size-summary:\n");
+pboth($summary);
+
+open SS, ">size-summary..new" or die $!;
+print SS $summary or die $!;
+close SS or die $!;
+rename 'size-summary..new',"size-summary.$fsys" or die $!;
+
+# Write to some status files to indicate what the backup system
+# ought to do when next invoked.
+# reset incremental backup count to 1.
open IAN,">increm-advance.new" or die $!;
print IAN "1\n" or die $!;
close IAN or die $!;
+# Next full backup is whatever the next link in the tape description
+# file says it ought to be.
open TN,">next-full.new" or die $!;
print TN "$next\n" or die $!;
close TN or die $!;
unlink 'last-tape','next-full';
+# We are the last tape to have been backed up
rename 'TAPEID','last-tape' or die $!;
rename 'this-md5sums',"md5sums.$fsys" or die $!;
rename 'log',"log.$fsys" or die $!;
~ian / chiark-utils.git / blobdiff