Differences

This shows you the differences between two versions of the page.

--- backuppc-notes [2015/04/17 17:42] – created snarg
+++ backuppc-notes [2018/11/26 09:00] (current) – snarg
@@ Line 1: / Line 1: @@
-== notes on transfering backuppc pc directories *with* hardlinks ==
+==== Notes on transfering backuppc pc directories *with* hardlinks ====
 === Untarring with hardlinks ===
 The command for extracting a tar made with BackupPC_tarPCCopy:
-<code>tar -xPv  in newbackupfs/pc</code>
+<code>cd newbackupfs/pc
+tar -xPv</code>
 (the P is important)
-=== Piping the restore through netcat ===
+=== Piping the transfe through netcat ===
 on source server:
 <code>BackupPC_tarPCCopy  /var/lib/backuppc/pc/hostname | nc mystic 9800</code>
@@ Line 14: / Line 15: @@
 <code>cd /var/lib/backuppc/pc
 nc -l -p 9800 | tar -xPpvf -</code>
+If getting a heap of "Cant find xx/x/x in pool, will copy file" errors - It could be because at some point backuppc was configured to not use the compressed pool. Try this patch which checks both pools for the file when generating a hardlink for the pipe to tar.
+<code>
+--- /usr/bin/BackupPC_tarPCCopy 2018-10-01 08:52:07.000000000 +0800
++++ /usr/local/bin/BackupPC_tarPCCopy-check-both-pools  2018-10-07 15:01:11.000000000 +0800
+@@ -496,6 +496,32 @@
+                     }
+                     $i++;
+                 }
++
++               if ( ! defined($linkName) ) {
++                       # now second take for the non compressed pool (next line sets compressed flag to 0)
++                       # - no idea why compressed files are making it into there - orlr 201810
++
++                       my $path = $bpc->MD52Path($digest, 0);
++                       my $i = -1;
++
++                       #print(STDERR "didnt find it, trying forcing compression off Looking up $hdr->{fullPath} at $path\n");
++                       while ( 1 ) {
++                           my $testPath = $path;
++                           $testPath .= "_$i" if ( $i >= 0 );
++                           last if ( !-f $testPath );
++                           my $inode = (stat(_))[1];
++                           if ( $inode == $hdr->{inode} ) {
++                               #
++                               # Found it!  Just emit a tar hardlink
++                               #
++                               $testPath =~ s{\Q$TopDir\E}{..};
++                               $linkName = $testPath;
++                               last;
++                           }
++                           $i++;
++                       }
++               }
++
+             }
+         }
+         if ( defined($linkName) ) {
+</code>
+==== Easy backuppc restore via netcat ====
+In this example the backup hostname is propertywestlocal, and some sample restore directories are given:
+(as backuppc on server)
+<code>BackupPC_tarCreate -h propertywestlocal -n 1464 -s /mnt/space/blockwall-client-mirrors/propertywest.com.au -r /mnt/space/blockwall-client-mirrors/propertywest.com.au -p samba /home/samba | nc localhost 38999</code>
+(as root on target pc [backuppc server if you like])
+<code>nc -l -p 38999 | tar -xvp</code>