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793 lines
26 KiB
793 lines
26 KiB
#!/usr/bin/perl
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# backuppcfs - a fuse module to access backuppc backups through the filesystem.
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# Copyright (C) 2009 Pieter Wuille
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# Based on the backuppc-fuse script by Stephen Day
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Changelog:
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# - 2017 Jun 17: updated for 4.x; added mtimes to backup directories;
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# added support for getxattr and listxattr (Craig Barratt)
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# - 2009 Nov 10: default_permissions on by default
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# - 2009 Jun 10: LRU cache to limit number of cached nodes
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# - 2009 Jun 09: Correction of absolute symlinks
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# - 2009 Jun 05: Errors propagate forced re-reads upwards
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# - 2009 Jun 05: Support for type!=mode, hardlinks, empty files
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# - 2009 Jun 03: Full directory merging (for share-directories)
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# - 2009 Jun 02: Initial version
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# Changes w.r.t. Stephen Day's version:
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# - cached tree - huge speedup
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# - support for character/blockdevices
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# - correct linkcounts for directories
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# - support for /'s in sharenames
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# - daemonization
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# - stateful open()'s to prevent seeking for every read
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# - correct merged view for incremental backups
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# - latest/oldest link in hosts to latest/oldest archive
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# - getopt for somewhat more configurability
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# - support for empty files
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# - support for xfermethods that don't set filetype bits in mode, like tar
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# - support for hardlinks (linkcount=1, however)
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# TODO:
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# - testing!
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# - error output/logging
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# - escaping of dangerous characters in host/sharenames
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# - fsstats
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# - mtime of root/hosts/links
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# - forced uid/perms/umask of virtual dirs/all dirs
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# - uid mapping
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# - common getattr generation - a lot seems shared
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# - mtime for virtual dirs (eg. most recent backup)
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# - some way of finding the last/first backup before/after a given date/time?
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use strict;
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use Fuse;
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use Fcntl ':mode';
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use POSIX qw/EROFS EOPNOTSUPP ENOENT EINVAL setsid strftime/;
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use Getopt::Long qw(:config permute bundling);
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require Carp;
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use lib "/usr/share/BackupPC/lib";
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use BackupPC::Lib;
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use BackupPC::XS qw( :all );
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use BackupPC::DirOps;
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use BackupPC::View;
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my $TTL_ROOT = 80000; # don't expect new hosts within a day
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my $TTL_HOST = 40000; # don't expect new archives within half a day
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my $TTL_ARCHIVE = 1000000; # +- infinite timeout for archives/shares
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my $TTL_SHARE = 1000000; # as as long as they exist, their content
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my $TTL_REST = 1000000; # does not change
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my $BLKSIZE = 512; # reasonable number - is it used for anything?
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my $DEFDEV = 0;
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my $DEFINODE = 1;
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my $DEFUID = $<; # your uid
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my ($DEFGID) = split(/ /,$(); # your gid
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my $DEFPERM = 0755; # u=rwx,g=rx,o=rx (for directories)
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my $CORLINKS = 0; # modify absolute symlinks to point to the archive root
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my $MOUNTPOINT = undef;
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my $MAXCACHE = 2048;
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#my $CONF_REALINODES = 1;
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#################################
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########### LRU lib #############
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#################################
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# an LRU (least recently used) datastructure:
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# a circular double-linked list, with one
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# marker node (which initially refers to itself)
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# the data of the marker node is a hash reference
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# that maps data elements to the lru nodes containing them
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# each node is [$prevRef,$data,$nextRef], while the
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# marker node is [$lastRef,$hash,$firstRef]
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# create a new lru data structure
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sub lru_create {
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my $x=[undef,{},undef];
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$x->[0]=$x;
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$x->[2]=$x;
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return $x;
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}
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# delete an entry from an lru
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sub lru_delete {
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my ($lru,$data) = @_;
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my $x = $lru->[1];
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if (exists $x->{$data}) {
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my $n = $x->{$data};
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my $prev = $n->[0];
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my $next = $n->[2];
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$prev->[2] = $next;
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$next->[0] = $prev;
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@{$n} = ();
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delete $x->{$data};
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}
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}
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# move an entry to the end of the structure, creating it if necessary
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sub lru_access {
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my ($lru,$data) = @_;
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my $x = $lru->[1];
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my $n;
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my $last;
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if (defined $x->{$data}) {
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$n = $x->{$data}; # find existing node
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my $prev = $n->[0]; # find its predecessor/successor
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my $next = $n->[2];
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$prev->[2] = $next; # make them point to eachother
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$next->[0] = $prev;
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$last = $lru->[0];
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$n->[0] = $last; # make the reused node know its new predecessor/successor
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$n->[2] = $lru;
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} else {
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$last = $lru->[0];
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$n = [$last,$data,$lru]; # create new node
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$x->{$data} = $n; # add it to the hashtable
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}
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$last->[2] = $n; # insert the entry itself
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$lru->[0] = $n;
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}
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# destroy a complete lru structure
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sub lru_destroy {
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my ($lru) = @_;
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my $x = $lru;
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while (defined $x->[2]) {
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my $nx = $x->[2];
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undef @{$x};
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$x = $nx;
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}
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}
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# retrieve the element least recently lru_access'ed
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sub lru_lru {
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my ($lru) = @_;
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my $x = $lru->[2];
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return undef if ($x == $lru);
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return $x->[1];
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}
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# calculate the size of the lru
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sub lru_size {
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my ($lru) = @_;
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return (0+(keys %{$lru->[1]}));
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}
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#################################
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########## cache lib ############
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#################################
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# a cached array is represented as an array reference containing:
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# - a function reference to call when the data has expired
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# - a scalar to pass to the function
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# - a ttl value (in seconds)
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# - an expiration time (seconds sinds epoch when current value expires, -1 if certainly/already expired)
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# - ref to the cached array
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# if a cache has subentries, these must be the values of a hash, referenced by the first value returned
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my $cachelru = lru_create();
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my %cachefn;
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# create a cached value (function ref,data,ttl)
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sub cache_create {
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my ($fn,$data,$ttl) = @_;
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my @ret = ($fn,$data,$ttl,-1,undef);
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return \@ret;
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}
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sub cache_evict {
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my ($cache) = @_;
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if (defined $cache->[2] && defined $cache->[4]) {
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lru_delete($cachelru,$cache);
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}
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if (defined $cache->[4]) {
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my $d = $cache->[4];
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if (defined $d->[0]) {
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foreach my $x (values %{$d->[0]}) {
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cache_evict($x);
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}
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}
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}
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}
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sub cache_purge {
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while (lru_size($cachelru) > $MAXCACHE) {
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my $old = lru_lru($cachelru);
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cache_evict($old);
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$old->[3] = -1;
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$old->[4] = undef;
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}
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}
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# read data from cache (refreshing it if necessary)
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sub cache_read {
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my ($cache,$force) = @_;
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cache_purge;
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my $nt = time;
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if (defined($cache->[2]) && (defined($force) || ($cache->[3] < $nt))) {
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cache_evict($cache);
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my @ret;
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@ret = $cachefn{$cache->[0]}->($cache->[1]);
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$cache->[4] = \@ret;
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$cache->[3] = $nt+$cache->[2];
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}
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lru_access($cachelru,$cache) if (defined($cache->[2]));
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return (@{$cache->[4]});
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}
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# create a cached object that returns a constant array
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sub cache_const {
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my @val = @_;
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my @ret = (undef,undef,undef,undef,\@val);
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return \@ret;
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}
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#################################
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######## tree functions #########
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#################################
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# the filesystem is internally represented by a (cached, see above) tree
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# each node is a cached array containing these elements:
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# - ref to hash containing [filename -> cached array] mappings
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# - attributes (corresponding to getinfo)
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# - backuppc attributes object
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# - actual data (currently: link data for symlinks)
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# reuse the same backuppc Lib object
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my $bpc;
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sub bpc {
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if (!defined $bpc) {
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$bpc = BackupPC::Lib->new(undef,undef,"",1);
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}
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return $bpc;
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}
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# a cache refresher that builds on top of another (directory) node, and adds some static subentries to it
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sub fs_dirmerge {
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my ($data) = @_;
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my ($type,$sdata,$ndir,$ent) = @{$data}; # nodetype name, data for node, number of added subentries that are dirs, hashref of subentries
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my ($sub,$attr,$a) = $cachefn{$type}->($sdata);
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return undef if (!defined $attr);
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if (S_ISDIR($attr->[2])) {
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my %nsub = %{$sub};
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my @nattr = @{$attr};
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foreach my $k (keys %{$ent}) {
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if (exists $nsub{$k}) { # a collision occurred
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my ($s1sub,$s1attr,$s1a) = cache_read($ent->{$k}); # check whether entry to add is a directory
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if (S_ISDIR($s1attr->[2])) {
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my ($s2sub,$s2attr,$s2a) = cache_read($nsub{$k}); # check whether entry in original dir is a directory
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if (S_ISDIR($s2attr->[2])) { # if so, substitute it with a new merge node
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$nsub{$k} = cache_create('dirmerge',[$nsub{$k}->[0],$nsub{$k}->[1],$s1attr->[3]-2,$s1sub],$nsub{$k}->[2]);
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next;
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}
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}
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if (!exists $nsub{$k.'_'}) { # try adding '_' otherwise
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$nsub{$k.'_'} = $ent->{$k};
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next;
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}
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my $i=1;
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$i++ while (exists $nsub{$k.'_'.$i}); # try adding subsequent '_<num>' otherwise
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$nsub{$k.'_'.$i} = $ent->{$k};
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} else {
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$nsub{$k} = $ent->{$k};
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}
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}
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$nattr[3] += $ndir;
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return (\%nsub,\@nattr,$a);
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} else {
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Carp::croak "Unable to add subentries to a non-directory"
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}
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}
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# the root cache refresher, no arguments
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sub fs_root {
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my $bpc=bpc();
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return undef if (!defined $bpc);
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my $hosts = $bpc->HostInfoRead();
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return undef if (!defined $hosts);
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my %hlist = map { ($_,cache_create('host',$_,$TTL_HOST)) } (keys %{$hosts});
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return (\%hlist,[$DEFDEV,$DEFINODE,S_IFDIR | $DEFPERM,2 + keys %hlist,$DEFUID,$DEFGID,0,1024,0,0,0,$BLKSIZE,2],undef);
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}
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sub fmtTime {
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my ($ut) = @_;
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return (strftime "%Y-%m-%d %H:%M:%S", localtime $ut);
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}
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# the host cache refresher, arguments (host)
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sub fs_host {
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my ($host) = @_;
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my @archives = (bpc()->BackupInfoRead($host));
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return undef if ($#archives<0);
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my $lnum = undef;
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my $onum = undef;
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my $lnumMtime = time;
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my $onumMtime = time;
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my $view = BackupPC::View->new(bpc(), $host, \@archives);
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return undef if (!defined $view);
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my %alist = map {
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if (!defined($lnum) || $_->{num}>$lnum) {
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$lnum = $_->{num};
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$lnumMtime = $_->{startTime};
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}
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if (!defined($onum) || $_->{num}<$onum) {
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$onum = $_->{num};
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$onumMtime = $_->{startTime};
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}
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(
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$_->{num},cache_create('archive',[$_,$view],$TTL_ARCHIVE),
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fmtTime($_->{startTime}),cache_const(undef,[$DEFDEV,$DEFINODE,S_IFLNK | $DEFPERM,1,$DEFUID,$DEFGID,0,length($_->{num}),$_->{startTime},$_->{startTime},$_->{startTime},$BLKSIZE,0],undef,$_->{num})
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)
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} (@archives);
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$alist{latest} = cache_const(undef,[$DEFDEV,$DEFINODE,S_IFLNK | $DEFPERM,1,$DEFUID,$DEFGID,0,length($lnum),$lnumMtime,$lnumMtime,$lnumMtime,$BLKSIZE,0],undef,"$lnum") if (defined($lnum));
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$alist{oldest} = cache_const(undef,[$DEFDEV,$DEFINODE,S_IFLNK | $DEFPERM,1,$DEFUID,$DEFGID,0,length($onum),$onumMtime,$onumMtime,$onumMtime,$BLKSIZE,0],undef,"$onum") if (defined($onum));
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return (\%alist,[$DEFDEV,$DEFINODE,S_IFDIR | $DEFPERM,2 + @archives,$DEFUID,$DEFGID,0,1024,0,0,0,$BLKSIZE,2],undef);
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}
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# recursive helper function to build a tree containing all shares
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sub buildtree {
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my ($node,$view,$archive) = @_;
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my %sub; # hash for all subdirectories
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foreach my $se (keys %{$node}) {
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$sub{$se} = buildtree($node->{$se},$view,$archive) if ($se ne '');
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}
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if (exists $node->{''}) {
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my $se = [$view,$archive,$node->{''},undef,''];
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return cache_create('dirmerge',['share',$se,0+(keys %sub),\%sub],$TTL_SHARE) if ((keys %sub)>0); # both a share and virtual sharename-dirs
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return cache_create('share',$se,$TTL_SHARE); # only a real share
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} else { # only a virtual sharename dir
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my $archivetime = $archive->{startTime};
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return cache_const(\%sub,[$DEFDEV,$DEFINODE,S_IFDIR | $DEFPERM,2 + keys %sub,$DEFUID,$DEFGID,0,1024,$archivetime,$archivetime,$archivetime,$BLKSIZE,2],undef);
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}
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}
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# the archive cache refresher, arguments [archiveref,view]
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sub fs_archive {
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my ($data) = @_;
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my ($archive,$view) = @{$data};
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my $archivenum = $archive->{num};
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my @shares = $view->shareList($archivenum);
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return undef if ($#shares<0);
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my %tree; # abstract tree - each node can have some name->subnode mappings for subdirs, and/or a '' entry referring to a share
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foreach my $share (@shares) { # loop over all shares
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my @path = grep { $_ ne '' && $_ ne '.' && $_ ne '..' } (split(/[\\\/]+/,$share)); # split them in pieces (both / and \ seen as separators)
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my $node = \%tree; # start at the root - node is a hashref to the current treenode
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while ($#path >= 0) { # while there are path components left
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my $ent = shift @path; # get a component
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$node->{$ent}={} if (!exists $node->{$ent}); # create empty subnode if it doesn't exist yet
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$node = $node->{$ent}; # travel down
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}
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$node->{''} = $share; # finally make the reached leaf node point to the share (full, original share name)
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}
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return cache_read(buildtree(\%tree,$view,$archive)); # now call helper funtion to turn it into a tree of cached arrays and evaluate it
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}
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# mapping from backuppc file types to stat() file type modes
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my %iftype = (
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BPC_FTYPE_FILE, S_IFREG,
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BPC_FTYPE_HARDLINK, S_IFLNK,
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BPC_FTYPE_SYMLINK, S_IFLNK,
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BPC_FTYPE_CHARDEV, S_IFCHR,
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BPC_FTYPE_BLOCKDEV, S_IFBLK,
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BPC_FTYPE_DIR, S_IFDIR,
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BPC_FTYPE_FIFO, S_IFIFO,
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BPC_FTYPE_SOCKET, S_IFSOCK,
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BPC_FTYPE_UNKNOWN, 0,
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BPC_FTYPE_DELETED, 0
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);
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# the share/backupdata cache refresher, arguments [view,archive,share,fileattr,path]
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sub fs_share {
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my ($data) = @_;
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my ($view,$archive,$share,$a,$path) = @{$data};
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my $archivenum = $archive->{num};
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my $ino = $DEFINODE;
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my $dev = $DEFDEV;
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# if (defined($a) && $CONF_REALINODES) {
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# ($dev,$ino) = stat($a->{fullPath});
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# }
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if (!defined($a) || $a->{type}==BPC_FTYPE_DIR) { # directory (root dir which has no $a, or subdir which does)
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my $nattr = $view->dirAttrib($archivenum,$share,$path); # get attributes/list of directory entries
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return undef if (!defined $nattr);
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my $sdirs = 0; # number of subdirectories
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my %sub = map {
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my $key=$_;
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my $val = $nattr->{$key};
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$sdirs++ if ($val->{type}==BPC_FTYPE_DIR); # count subdirs
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($key,cache_create('share',[$view,$archive,$share,$val,$path.'/'.$key],$TTL_REST))
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} (keys %{$nattr});
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if (!defined($a)) { # root of share
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my $archivetime = $archive->{startTime};
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return (\%sub,[$dev,$ino,S_IFDIR | $DEFPERM,2 + $sdirs,$DEFUID,$DEFGID,0,1024,$archivetime,$archivetime,$archivetime,$BLKSIZE,2],undef);
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} else { # subdir in share
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my $mtime = $a->{mtime};
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my $size = $a->{size};
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$ino = $a->{inode};
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my $blocks = int ( $size / 512 );
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if ($size==0) { # some xfermethods don't store a meaningful size for directories
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$size = 1024;
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$blocks = 2;
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}
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return (\%sub,[$dev,$ino,S_IFDIR | ($a->{mode} & ~S_IFMT),2 + $sdirs,$a->{uid},$a->{gid},0,$size,$mtime,$mtime,$mtime,$BLKSIZE,$blocks],$a);
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}
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} else { # non-directory
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my $mtime = $a->{mtime};
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my $size = $a->{size};
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my $blocks = int ( $size / 512 );
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my $rdev = 0;
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my $nlinks = $a->{nlinks} > 0 ? $a->{nlinks} : 1;
|
|
my $fdata;
|
|
my $mode = ($a->{mode} & (~S_IFMT)) | $iftype{$a->{type}};
|
|
$ino = $a->{inode};
|
|
if (S_ISLNK($mode) || S_ISCHR($mode) || S_ISBLK($mode)) { # link, character or block device: read real backup data
|
|
my $f = BackupPC::XS::FileZIO::open($a->{fullPath}, 0, $a->{compress});
|
|
return undef if (!defined $f);
|
|
$f->read(\$fdata,65536);
|
|
$f->close;
|
|
}
|
|
if ((S_ISCHR($mode) || S_ISBLK($mode)) && $fdata =~ /(\d+),(\d+)/) {
|
|
$rdev = $1*256 + $2;
|
|
}
|
|
if ($a->{type} == BPC_FTYPE_HARDLINK) {
|
|
my $sa = $view->fileAttrib($archivenum,$share,'/'.$fdata);
|
|
return undef if (!defined $sa);
|
|
return fs_share([$view,$archive,$share,$sa,$fdata]);
|
|
}
|
|
if ($a->{type} == BPC_FTYPE_SYMLINK) {
|
|
if ($CORLINKS && ((substr $fdata,0,1) eq '/')) {
|
|
$fdata = $MOUNTPOINT . '/' . $view->{host} . '/' . $archivenum . '/' . $fdata;
|
|
}
|
|
}
|
|
return (undef,[$dev,$ino,$mode,$nlinks,$a->{uid},$a->{gid},$rdev,$size,$mtime,$mtime,$mtime,$BLKSIZE,$blocks],$a,$fdata);
|
|
}
|
|
}
|
|
|
|
my $root = cache_create('root',undef,$TTL_ROOT);
|
|
|
|
%cachefn = (
|
|
root => \&fs_root,
|
|
host => \&fs_host,
|
|
archive => \&fs_archive,
|
|
share => \&fs_share,
|
|
dirmerge => \&fs_dirmerge,
|
|
);
|
|
|
|
# lookup a node in the tree
|
|
sub get_data {
|
|
my ($path) = @_;
|
|
my @path = grep { $_ ne '' && $_ ne '.' && $_ ne '..' } (split(/\/+/,$path));
|
|
my $done="";
|
|
my $node = $root;
|
|
foreach my $ent (@path) {
|
|
my ($sub,$attr) = (cache_read($node));
|
|
if (!defined $attr) { # entry itself doesn't seem te exist - cache tree is wrong
|
|
prop_failure($done);
|
|
return undef;
|
|
}
|
|
($sub)=(cache_read($node,1)) if (!defined $sub || !defined $sub->{$ent}); # requested subnode does not seem te exist - force re-read
|
|
return undef if (!defined $sub || !defined $sub->{$ent}); # it really doesn't exist
|
|
$done .= '/'.$ent;
|
|
$node = $sub->{$ent};
|
|
}
|
|
return cache_read($node);
|
|
}
|
|
|
|
# called when a particular path doesn't seem to exist anymore - forces re-evaluations until
|
|
# it finds what caused the failure
|
|
sub prop_failure {
|
|
my ($path) = @_;
|
|
my @path = grep { $_ ne '' && $_ ne '.' && $_ ne '..' } (split(/\/+/,$path)); # path components
|
|
my @node = ($root); # subsequent nodes in the (currently cached) tree
|
|
my @ent = (); # entries we'd like to exist
|
|
while (@path) {
|
|
my $ent = shift @path;
|
|
push @ent,$ent;
|
|
my ($sub,$attr) = (cache_read($node[$#node]));
|
|
last if (!defined $attr);
|
|
return if (!defined $sub);
|
|
return if (!exists $sub->{$ent});
|
|
last if (!@path);
|
|
push @node,$sub->{$ent};
|
|
}
|
|
while (@node) {
|
|
my $node = pop @node;
|
|
my $ent = pop @ent;
|
|
my ($sub,$attr) = (cache_read($node,1));
|
|
last if (!defined $ent || (defined $attr && (!defined $sub || !exists $sub->{$ent})));
|
|
}
|
|
}
|
|
|
|
#################################
|
|
######## Fuse functions #########
|
|
#################################
|
|
|
|
sub bpc_getattr {
|
|
my ($path) = @_;
|
|
my ($sub,$attr) = get_data($path);
|
|
return -ENOENT() if (!defined $attr);
|
|
return (@{$attr});
|
|
}
|
|
|
|
sub bpc_readlink {
|
|
my ($path) = @_;
|
|
my ($sub,$attr,$a,$fd) = get_data($path);
|
|
return -ENOENT() if (!defined $attr);
|
|
return -EINVAL() if (!defined $fd);
|
|
return $fd;
|
|
}
|
|
|
|
sub bpc_getdir {
|
|
my ($path) = @_;
|
|
my ($sub) = get_data($path);
|
|
return -ENOENT() if (!defined $sub);
|
|
my @list = keys %{$sub};
|
|
return ( '.', '..', @list, 0 );
|
|
}
|
|
|
|
sub bpc_rwop {
|
|
return -EROFS();
|
|
}
|
|
|
|
sub bpc_unsupp {
|
|
return -EOPNOTSUPP();
|
|
}
|
|
|
|
my %files; # pathname -> [(zio,pos)] # zio==undef means file is empty
|
|
|
|
sub bpc_open {
|
|
my ($path,$mode) = @_;
|
|
my ($sub,$attr,$a) = get_data($path);
|
|
return -ENOENT() if (!defined $attr);
|
|
my $zio;
|
|
if ($attr->[7]!=0) { # non-empty file
|
|
$zio = BackupPC::XS::FileZIO::open($a->{fullPath}, 0, $a->{compress}); # create zio object
|
|
if (!defined $zio) {
|
|
my $err = 0-$!;
|
|
prop_failure($path);
|
|
return $err;
|
|
}
|
|
}
|
|
push @{$files{$path}},[$zio,0]; # add the zio (which now has position 0) to the list of zio's for the requested file
|
|
return 0;
|
|
}
|
|
|
|
sub bpc_release {
|
|
my ($path,$mode) = @_;
|
|
my $lastpos=-1;
|
|
my $lasti=undef;
|
|
my $lst = $files{$path};
|
|
# find zio with highest pos
|
|
foreach my $i (0..$#{$lst}) {
|
|
my $ent = $lst->[$i];
|
|
my ($zio,$pos) = @{$ent};
|
|
if ($pos>$lastpos) {
|
|
$lastpos = $pos;
|
|
$lasti = $i;
|
|
}
|
|
}
|
|
if (!defined $lasti) { # fail miserably when nothing found - this means a fuse 'release' call happened without corresponding 'open' call
|
|
Carp::croak "Closing unopened file '$path'";
|
|
}
|
|
my ($zio) = @{$lst->[$lasti]}; # retrieve that 'best' zio
|
|
$zio->close() if (defined $zio); # close it
|
|
if ($#{$lst}==0) { # remove it from the hash
|
|
delete $files{$path};
|
|
} else {
|
|
splice @{$files{$path}},$lasti,1;
|
|
}
|
|
}
|
|
|
|
sub bpc_read {
|
|
my ($path,$size,$offset) = @_;
|
|
my $bestpos=-1;
|
|
my $besti=undef;
|
|
my $lst = $files{$path};
|
|
# find zio with highest pos - if possible highest pos <= offset, otherwise highest pos whatsoever
|
|
foreach my $i (0..$#{$lst}) {
|
|
my $ent = $lst->[$i];
|
|
my ($zio,$pos) = @{$ent};
|
|
if (($pos<=$offset && ($pos>$bestpos || $bestpos>$offset)) || ($pos>$offset && $pos>$bestpos && ($bestpos>$offset || $bestpos<0))) {
|
|
$bestpos = $pos;
|
|
$besti = $i;
|
|
}
|
|
}
|
|
if (!defined $besti) { # fail miserable when nothing was found - it means fuse requested a read from an unopened file
|
|
Carp::croak "Reading from unopened file '$path'";
|
|
}
|
|
my ($zio,$pos) = @{$lst->[$besti]}; # retrieve zio object and its file position
|
|
return '' if (!defined $zio);
|
|
if ($pos>$offset) {
|
|
$zio->rewind; # rewind the zio object if it already passed the requested start position for the read
|
|
$pos=0;
|
|
}
|
|
my $data;
|
|
while ($pos<$offset) { # as long a there is unrequested data left, seek
|
|
my $do = $offset-$pos;
|
|
$do=65536 if ($do>65536);
|
|
my $ret = $zio->read(\$data,$do);
|
|
if ($ret<=0) { # upon eof, return nothing; upon error, return failure
|
|
$lst->[$besti]->[1]=$pos;
|
|
if ($ret<0) {
|
|
my $err = 0 - $!;
|
|
prop_failure($path);
|
|
return $ret;
|
|
}
|
|
return '';
|
|
}
|
|
$pos += $ret;
|
|
}
|
|
my $ret = $zio->read(\$data,$size); # do the actual read request
|
|
if ($ret<=0) { # upon eof, return nothing, upon error, return failure
|
|
$lst->[$besti]->[1]=$pos;
|
|
if ($ret<0) {
|
|
my $err = 0 - $!;
|
|
prop_failure($path);
|
|
return $ret;
|
|
}
|
|
return '';
|
|
}
|
|
$pos += $ret; # update position
|
|
$lst->[$besti]->[1]=$pos; # update position in hash
|
|
return $data; # return data
|
|
}
|
|
|
|
sub bpc_statfs {
|
|
return 0;
|
|
}
|
|
|
|
sub bpc_flush {
|
|
return 0;
|
|
}
|
|
|
|
sub bpc_fsync {
|
|
return 0;
|
|
}
|
|
|
|
sub bpc_listxattr {
|
|
my ($path) = @_;
|
|
my ($sub,$attr, $a) = get_data($path);
|
|
return -ENOENT() if (!defined $a);
|
|
return (0) if ( !defined($a->{xattr}) );
|
|
return (sort(keys(%{$a->{xattr}})), 0);
|
|
}
|
|
|
|
sub bpc_getxattr {
|
|
my ($path,$param) = @_;
|
|
my ($sub,$attr, $a) = get_data($path);
|
|
return -ENOENT() if (!defined $a);
|
|
return 0 if ( !defined($a->{xattr}) );
|
|
return $a->{xattr}{$param};
|
|
}
|
|
|
|
#################################
|
|
############# Main ##############
|
|
#################################
|
|
|
|
my $showhelp = 0;
|
|
my $foreground = 0;
|
|
my %fuseopts = ('default_permissions');
|
|
|
|
my $ok = GetOptions(
|
|
'foreground|f!' => \$foreground,
|
|
'uid|u=i' => sub { $DEFUID = $_[1]; die "uid out of range: $_[1]" if ($DEFUID<0 || $DEFUID>65535) },
|
|
'gid|g=i' => sub { $DEFGID = $_[1]; die "gid out of range: $_[1]" if ($DEFGID<0 || $DEFGID>65535) },
|
|
'user|U=s' => sub { $DEFUID = getpwnam($_[1]); die "unknown user '$_[1]'" if (!defined $DEFUID) },
|
|
'group|G=s' => sub { $DEFGID = getgrnam($_[1]); die "unknown group '$_[1]'" if (!defined $DEFGID) },
|
|
'mode|m=o' => sub { $DEFPERM = $_[1]; die "mode out of range: $_[1]" if ($DEFPERM<0 || $DEFPERM>32767) },
|
|
'cache|c=i' => sub { $MAXCACHE = $_[1]; die "cache out of range: $_[1]" if ($MAXCACHE<32 || $MAXCACHE>1048576) },
|
|
'correct-links|l!' => \$CORLINKS,
|
|
'help|h|?' => \$showhelp,
|
|
'o=s' => sub { foreach my $opt (split /,+/,$_[1]) { if (substr($opt,0,3) eq 'no_') { delete $fuseopts{lc $opt} } else { $fuseopts{lc $opt}=1; } } },
|
|
);
|
|
if ($ok && !$showhelp) {
|
|
if ($#ARGV>=0) {
|
|
$MOUNTPOINT = shift(@ARGV) if ($#ARGV>=0);
|
|
}
|
|
$ok = 0 if (!defined $MOUNTPOINT);
|
|
}
|
|
if ($ok && !$showhelp) {
|
|
die "mountpoint '$MOUNTPOINT' if not valid" if (! -d $MOUNTPOINT);
|
|
}
|
|
|
|
if (!$ok || $showhelp) {
|
|
print "Usage: $0 [options] mountpoint\n";
|
|
print "Example: $0 /mnt/fuse\n";
|
|
print " -> all backups will be read-only below /mnt/fuse\n";
|
|
print "\n";
|
|
print "Options:\n";
|
|
print " -u,--uid UID Use UID as owner of the mounted filesystem\n";
|
|
print " -U,--user USER Use USER as owner of the mounted filesystem\n";
|
|
print " -g,--gid GID Use GID as owner of the mounted filesystem\n";
|
|
print " -G,--group GROUP Use GROUP as owner of the mounted filesystem\n";
|
|
print " -m,--mode MODE Use MODE as permissions of the filesystem\n";
|
|
print " -h,--help Show this help text\n";
|
|
print " -f,--foreground Do not daemonize\n";
|
|
print " -l,--correct-links Correct absolute symlinks - mountpoint must be absolute\n";
|
|
print " -c,--cache SIZE Keep directory cache smaller than SIZE nodes\n";
|
|
print " -o OPT1[,OPT2[,...]] Fuse options\n";
|
|
print "\n";
|
|
print "FUSE options (may or may not work, depending on fuse version):\n";
|
|
print " -o allow_other allow access to other users\n";
|
|
print " -o nonempty allow mounts over non-empty file/dir\n";
|
|
print " -o no_default_permissions disable permission checking by kernel\n";
|
|
print " -o fsname=NAME set filesystem name\n";
|
|
print "\n";
|
|
print "By default you/your primary group are owners of the filesystem\n";
|
|
print "directories, using mode 0755 (owner rwx, others rx).\n";
|
|
print "Use 'fusermount -u mountpoint' to unmount.\n";
|
|
print "By daemonizing (default), no errors will be shown.\n";
|
|
exit (!$ok);
|
|
}
|
|
|
|
# daemonize
|
|
sub daemonize {
|
|
umask 0;
|
|
open STDIN, '</dev/null' or die "Can't read /dev/null: $!";
|
|
open STDOUT, '>/dev/null' or die "Can't write to /dev/null: $!";
|
|
open STDERR, '>/dev/null' or die "Can't write to /dev/null: $!";
|
|
defined(my $pid = fork) or die "Can't fork: $!";
|
|
exit if $pid;
|
|
setsid or die "Can't start a new session: $!";
|
|
}
|
|
|
|
daemonize if (!$foreground);
|
|
|
|
# run fuse
|
|
Fuse::main(
|
|
mountopts => join(',',keys %fuseopts),
|
|
mountpoint => $MOUNTPOINT,
|
|
threaded => 0,
|
|
debug => 0,
|
|
|
|
# supported operations
|
|
open=> \&bpc_open,
|
|
release=> \&bpc_release,
|
|
getattr=> \&bpc_getattr,
|
|
readlink=> \&bpc_readlink,
|
|
getdir=> \&bpc_getdir,
|
|
read=> \&bpc_read,
|
|
flush=> \&bpc_flush,
|
|
statfs=> \&bpc_statfs,
|
|
|
|
# not meaningful for read-only view
|
|
write=> \&bpc_rwop,
|
|
mknod=> \&bpc_rwop,
|
|
mkdir=> \&bpc_rwop,
|
|
unlink=> \&bpc_rwop,
|
|
rmdir=> \&bpc_rwop,
|
|
symlink=> \&bpc_rwop,
|
|
rename=> \&bpc_rwop,
|
|
link=> \&bpc_rwop,
|
|
chmod=> \&bpc_rwop,
|
|
chown=> \&bpc_rwop,
|
|
truncate=> \&bpc_rwop,
|
|
utime=> \&bpc_rwop,
|
|
fsync=> \&bpc_fsync,
|
|
|
|
# not supported
|
|
setxattr=> \&bpc_unsupp,
|
|
getxattr=> \&bpc_getxattr,
|
|
listxattr=> \&bpc_listxattr,
|
|
removexattr=> \&bpc_unsupp
|
|
|
|
);
|
|
|
|
lru_destroy($cachelru);
|
|
|