[Xen-devel] [PATCH] sqlite_backup.pl: Create backup of DB using locks to avoid problems with queuerunner.

[Birin Sanchez <birin.sanchez@xxxxxxxxxx>]

---
 config/emesinae.conf               |  3 +++
 config/examples/test/emesinae.conf |  3 +++
 scripts/sqlite_backup.pl           | 39 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+)
 create mode 100755 scripts/sqlite_backup.pl

diff --git a/config/emesinae.conf b/config/emesinae.conf
index 0aa1b3f..dd58c94 100644
--- a/config/emesinae.conf
+++ b/config/emesinae.conf
@@ -76,3 +76,6 @@ $c{ControlBlacklistPath} = "/etc/emesinae/control.blacklist";
 # Severity levels, in decending order of criticality
 @{ $c{SeverityLevels} } = qw/blocker critical normal wishlist/;
 $c{DefaultSeverity} = "normal";
+
+# Backup configuration
+$c{BackupDir}   = "/var/backups/";
diff --git a/config/examples/test/emesinae.conf 
b/config/examples/test/emesinae.conf
index 528dcb6..11e4fad 100644
--- a/config/examples/test/emesinae.conf
+++ b/config/examples/test/emesinae.conf
@@ -70,3 +70,6 @@ $c{ControlBlacklistPath} = "/srv/test/etc/control.blacklist";
 # Severity levels, in decending order of criticality
 @{ $c{SeverityLevels} } = qw/blocker critical normal wishlist/;
 $c{DefaultSeverity} = "normal";
+
+# Backup configuration
+$c{BackupDir}   = "/srv/test/var/backups/";
diff --git a/scripts/sqlite_backup.pl b/scripts/sqlite_backup.pl
new file mode 100755
index 0000000..557bc59
--- /dev/null
+++ b/scripts/sqlite_backup.pl
@@ -0,0 +1,39 @@
+#!/usr/bin/perl
+#
+# Creates a backup of the current DB in $c{BackupDir}
+# using locks to avoid race conditions with queuerunner
+
+use strict;
+use warnings;
+
+use Emesinae::Common;
+use Emesinae::Paths;
+use File::Copy;
+use File::Basename;
+
+readconfig();
+
+chdir( $c{BackupDir} ) || die("chdir to dir $c{BackupDir}: $!");
+
+
+my $lock = subsyslock('queuerunner');
+
+my $BackupDB = $c{BackupDir} . basename($c{DB});
+my $BackupDBxz = $c{BackupDir} . basename($c{DB}) . ".xz";
+my $OldBackupDBxz = $c{BackupDir} . basename($c{DB}) . ".old.xz";
+
+if ( -f $BackupDBxz ) {
+    move($BackupDBxz, $OldBackupDBxz) or die ("move failed: $!");
+}
+
+my $dbh = DBI->connect("dbi:SQLite:dbname=$c{DB}","","");
+$dbh->sqlite_backup_to_file( $BackupDB );
+undef $dbh;
+
+my @args = ("xz", "$BackupDB");
+system(@args) == 0
+    or die ("xz compress failed: $?");
+
+subsysunlock($lock);
+
+exit(0)
-- 
1.8.3.2


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