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add support for using BTRFS subvolumes instead of copying subdirectories #140

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add support for using BTRFS subvolumes instead of copying subdirectories #140

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172 changes: 152 additions & 20 deletions rsnapshot-program.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,7 @@
# partitions within a backup point)
my $link_dest = 0; # use the --link-dest option to rsync
my $stop_on_stale_lockfile = 0; # stop if there is a stale lockfile
my $btrfs_mode = 0; # use BTRFS subvolumes

# how much noise should we make? the default is 2
#
Expand Down Expand Up @@ -1245,6 +1246,23 @@ sub parse_config_file {
next;
}

# BTRFS_MODE
if ($var eq 'btrfs_mode') {
if (!defined($value)) {
config_err($file_line_num, "$line - btrfs_mode can not be blank");
next;
}
if (!is_boolean($value)) {
config_err($file_line_num,
"$line - \"$value\" is not a legal value for btrfs_mode, must be 0 or 1 only");
next;
}

$btrfs_mode = $value;
$line_syntax_ok = 1;
next;
}

# LOCKFILE
if ($var eq 'lockfile') {
if (!defined($value)) { config_err($file_line_num, "$line - lockfile can not be blank"); }
Expand Down Expand Up @@ -3390,14 +3408,25 @@ sub rotate_lowest_snapshots {

# otherwise the default is to delete the oldest directory for this interval
else {
display_rm_rf("$config_vars{'snapshot_root'}/$interval.$interval_max/");

if (0 == $test) {
my $result = rm_rf("$config_vars{'snapshot_root'}/$interval.$interval_max/");
if (0 == $result) {
bail("Error! rm_rf(\"$config_vars{'snapshot_root'}/$interval.$interval_max/\")\n");
}
}
if (0 == $btrfs_mode) {
display_rm_rf("$config_vars{'snapshot_root'}/$interval.$interval_max/");

if (0 == $test) {
my $result = rm_rf("$config_vars{'snapshot_root'}/$interval.$interval_max/");
if (0 == $result) {
bail("Error! rm_rf(\"$config_vars{'snapshot_root'}/$interval.$interval_max/\")\n");
}
}
}
else {
display_rm_subvolume("$config_vars{'snapshot_root'}/$interval.$interval_max/");
if (0 == $test) {
my $result = rm_subvolume("$config_vars{'snapshot_root'}/$interval.$interval_max/");
if (0 == $result) {
bail("Error! rm_subvolume(\"$config_vars{'snapshot_root'}/$interval.$interval_max/\")\n");
}
}
}
}
}

Expand Down Expand Up @@ -3539,18 +3568,35 @@ sub rotate_lowest_snapshots {

# call generic cp_al() subroutine
if (-d "$config_vars{'snapshot_root'}/$interval.0/") {
display_cp_al("$config_vars{'snapshot_root'}/$interval.0",
"$config_vars{'snapshot_root'}/$interval.1");
if (0 == $test) {
$result =
cp_al("$config_vars{'snapshot_root'}/$interval.0/", "$config_vars{'snapshot_root'}/$interval.1/");
if (!$result) {
my $errstr = '';
$errstr .= "Error! cp_al(\"$config_vars{'snapshot_root'}/$interval.0/\", ";
$errstr .= "\"$config_vars{'snapshot_root'}/$interval.1/\")";
bail($errstr);
}
}

if (0 == $btrfs_mode) {
display_cp_al("$config_vars{'snapshot_root'}/$interval.0",
"$config_vars{'snapshot_root'}/$interval.1");
if (0 == $test) {
$result =
cp_al("$config_vars{'snapshot_root'}/$interval.0/", "$config_vars{'snapshot_root'}/$interval.1/");
if (!$result) {
my $errstr = '';
$errstr .= "Error! cp_al(\"$config_vars{'snapshot_root'}/$interval.0/\", ";
$errstr .= "\"$config_vars{'snapshot_root'}/$interval.1/\")";
bail($errstr);
}
}
}
else {
display_cp_subvolume("$config_vars{'snapshot_root'}/$interval.0",
"$config_vars{'snapshot_root'}/$interval.1");
if (0 == $test) {
$result =
cp_subvolume("$config_vars{'snapshot_root'}/$interval.0/", "$config_vars{'snapshot_root'}/$interval.1/");
if (!$result) {
my $errstr = '';
$errstr .= "Error! cp_subvolume(\"$config_vars{'snapshot_root'}/$interval.0/\", ";
$errstr .= "\"$config_vars{'snapshot_root'}/$interval.1/\") did yield $result";
bail($errstr);
}
}
}
}
}
}
Expand Down Expand Up @@ -5300,6 +5346,92 @@ sub cmd_rm_rf {
return (1);
}

# accepts a path
# displays the BTRFS command for removing a subvolume
sub display_rm_subvolume {
my $path = shift(@_);

if (!defined($path)) { bail('display_rm_subvolume() requires an argument'); }

if (defined($config_vars{'cmd_btrfs'})) {
print_cmd("$config_vars{'cmd_btrfs'} subvolume delete $path");
}
else {
print_cmd("btrfs subvolume delete $path");
}
}

# calls btrfs to remove a subvolume
# returns 1 on success, 0 on failure
sub rm_subvolume {
my $path = shift(@_);
my $result = 0;
my $btrfs = "btrfs";
if (defined($config_vars{'cmd_btrfs'})) {
$btrfs = $config_vars{'cmd_btrfs'}
}

# make sure we were passed an argument
if (!defined($path)) { return (0); }

# extra bonus safety feature!
# confirm that whatever we're deleting must be inside the snapshot_root
if (index($path, $config_vars{'snapshot_root'}) != 0) {
bail("rm_subvolume() tried to delete something outside of $config_vars{'snapshot_root'}! Quitting now!");
}

$result = system($btrfs, 'subvolume', 'delete', "$path");
if ($result != 0) {
return (0);
}

return (1);
}

# accepts a path
# displays the BTRFS command for duplicating a subvolume
sub display_cp_subvolume {
my $src = shift(@_);
my $dst = shift(@_);

if (!defined($src) or !defined($dst)) { bail('display_cp_subvolume() requires two arguments'); }

if (defined($config_vars{'cmd_btrfs'})) {
print_cmd("$config_vars{'cmd_btrfs'} subvolume snapshot $src $dst");
}
else {
print_cmd("btrfs subvolume snapshot $src $dst");
}
}

# calls btrfs to diplicate a subvolume
# returns 1 on success, 0 on failure
sub cp_subvolume {
my $src = shift(@_);
my $dst = shift(@_);
my $result = 0;
my $btrfs = "btrfs";
if (defined($config_vars{'cmd_btrfs'})) {
$btrfs = $config_vars{'cmd_btrfs'}
}

# make sure we were passed an argument
if (!defined($src) or !defined($dst)) { return (0); }

# extra bonus safety feature!
# confirm that whatever we're deleting must be inside the snapshot_root
if (index($src, $config_vars{'snapshot_root'}) != 0) {
bail("cp_subvolume() tried to copy something outside of $config_vars{'snapshot_root'}! Quitting now!");
}

$result = system($btrfs, 'subvolume', 'snapshot', "$src", "$dst");

if ($result != 0) {
return (0);
}
return (1);
}

# accepts no arguments
# calls the 'du' command to show rsnapshot's disk usage
# exits the program with 0 for success, 1 for failure
Expand Down