seems to work with test case: PATH=~ian/things/chiark-utils/cprogs:$PATH ./snaprsync...

[chiark-utils.git] / backup / backuplib.pl

diff --git a/backup/backuplib.pl b/backup/backuplib.pl
index 50cc70a745f9aa070ed6778f12e3455c3df1303a..b537f2ff7544874d6693141f8f851cf7630d305f 100644 (file)
--- a/backup/backuplib.pl
+++ b/backup/backuplib.pl
@@ -43,8 +43,7 @@ sub setstatus ($) {
 # used to implement the funky pipeline stuff.
 sub startprocess ($$$) {
     my ($i,$o,$c) = @_;
-    print LOG "  $c\n" or die $!;
-    print "  $c\n" or die $!;
+    pboth("  $c\n");
     defined($p= fork) or die $!;
     if ($p) { $processes{$p}= $c; return; }
     open STDIN,"$i" or die "$c stdin $i: $!";
@@ -54,7 +53,7 @@ sub startprocess ($$$) {
 }
 
 sub rewind_raw () {
-    system "mt -f $tape rewind"; $? and die $?;
+    runsystem("mt -f $tape rewind");
 }
 
 sub readtapeid_raw () {
@@ -66,11 +65,34 @@ sub readtapeid_raw () {
           "| tar -b$blocksize -vvxf - TAPEID";
 }
 
+sub runsystem ($) {
+    pboth("    $_[0]\n");
+    system $_[0];
+    $? and die $?;
+}
+
+sub pboth ($) {
+    my ($str) = @_;
+    print LOG $str or die $!;
+    print $str or die $!;
+}
+
+sub nexttapefile ($) {
+    my ($what) = @_;
+    $currenttapefilenumber++;
+    $currenttapefilename= $what;
+    pboth(sprintf "writing tape file #%d (mt fsf %d): %s\n",
+         $currenttapefilenumber, $currenttapefilenumber-1, $what);
+}
+
 sub writetapeid ($$) {
     open T, ">TAPEID" or die $!;
     print T "$_[0]\n$_[1]\n" or die $!;
     close T or die $!;
 
+    $currenttapefilenumber= 0;
+    nexttapefile('TAPEID');
+
     system "tar -b$blocksize -vvcf TAPEID.tar TAPEID"; $? and die $?;
     system "dd if=TAPEID.tar of=$ntape bs=${blocksize}b count=10";
     $? and die $?;
@@ -84,8 +106,7 @@ sub endprocesses () {
        delete $processes{$p};
        $? && die "error: command gave code $?: $c\n";
     }
-    print LOG "  ok\n" or die $!;
-    print "  ok\n" or die $!;
+    pboth("  ok\n");
 }
 
 sub killprocesses {
@@ -115,6 +136,8 @@ sub readfsysfile ($) {
            $prefix{$1}= $2;
        } elsif (m/^prefix\-df\s+(\w+)\s+(\S.*\S)$/) {
            $prefixdf{$1}= $2;
+       } elsif (m/^snap(?:\=(\w+))?\s+(\w+)\s+(\w+)$/) {
+            push @excldir,$1;
        } elsif (m/^excludedir\s+(\S.*\S)$/) {
             push @excldir,$1;
         } elsif (m/^exclude\s+(\S.*\S)$/) {
@@ -150,8 +173,6 @@ sub parsefsys () {
        $dopts= $3;
        $prefix= '<local>';
        $pcstr= '';
-       stat $atf or die "stat $atf: $!";
-       -d _ or die "not a dir: $atf";
        $rstr= '';
     } elsif ($tf =~ m#^(/\S*)\s+(\w+)([,=0-9a-z]*)\s+(\w+)$#) {
         # Line of form '[/device:]/file/system dumptype[,options] prefix'
@@ -167,13 +188,25 @@ sub parsefsys () {
        die "fsys $tf ?";
     }
 
+    $fsidstr= $pcstr.$atf;
+    $fsidstr =~ s/[,+]/+$&/g;
+    $fsidstr =~ s#/#,#g;
+    $fsidfile= "/var/lib/chiark-backup/incstamp,$fsidstr";
+
     $dev = $atf =~ s,^(.*)\:,, ? $1 : '';
 
+    if (!length $pcstr) {
+       stat $atf or die "stat $atf: $!";
+       -d _ or die "not a dir: $atf";
+    }
+
     undef %dopt;
     foreach $dopt (split /\,/,$dopts) {
        if (grep { $dopt eq $_ } qw(gz)) {
            $dopt{$dopt}= 'y';
-       } elsif ($dopt =~ m/\=/ && grep { $` eq $_ } qw(gz)) {
+       } elsif (grep { $dopt eq $_ } qw(snap)) {
+           $dopt{$dopt}= $dopt;
+       } elsif ($dopt =~ m/\=/ && grep { $` eq $_ } qw(gz snap)) {
            $dopt{$`}= $';
        } elsif (length $dopt) {
            die "unknown option $dopt (in $dopts $tf)";
@@ -192,6 +225,50 @@ sub parsefsys () {
            $$gzo= '';
        }
     }
+
+    if (length $dopt{'snap'}) {
+       length $dev or die "$pcstr:$atf no device but needed for snap";
+    }
+}
+
+sub execute ($) {
+    pboth("  $_[0]\n");
+    system $_[0]; $? and die "$_[0] $?";
+}
+
+sub prepfsys () {
+    $dev_print= $dev;
+    $atf_print= $atf;
+    
+    if (length $dopt{'snap'}) {
+       
+       system('snap-drop'); $? and die $?;
+       
+       $snapscripts= '/etc/chiark-backup/snap';
+       $snapbase= "$rstr $snapscripts/$dopt{'snap'}";
+       $snapargs= "/var/lib/chiark-backup";
+
+       $snapsnap= "$snapbase snap $snapargs $dev $atf";
+       $snapdrop= "$snapbase drop $snapargs";
+
+       open SD, ">snap-drop.new" or die $!;
+       print SD $snapdrop,"\n" or die $!;
+       close SD or die $!;
+       rename "snap-drop.new","snap-drop" or die $!;
+
+       execute($snapsnap);
+
+       $dev_nosnap= $dev;
+       $atf_nosnap= $atf;
+       $dev= "/var/lib/chiark-backup/snap-device";
+       $atf= "/var/lib/chiark-backup/snap-mount";
+    }
+}
+
+sub finfsys () {
+    if (length $dopt{'snap'}) {
+       system('snap-drop'); $? and die $?;
+    }
 }
 
 sub openlog () {