Script API
Introduction
Pre- and post-scripts are use to execute scripts before or after certain amanda commands. The scripts can be executed on the client or server, once for each DLE or once for each client host. Uses for pre- and post-scripts include:
- to stop and start database servers so that the binary backup is consistent
- to take a snapshot of a database
- to send emails or other notifications
Script calling convention
This is subject to change
/path/to/script [execute-on]+ [--config <config>] [--host <host>] [--disk <disk>] [--device <device>] input of fd0: tool property (see below) output on fd1 free format, will go to the amanda debug file.
execute-on is a comma-separated list of one or more words of the form (pre|post)-(dle|host)-(selfcheck|estimate|backup). The whole list is:
pre-dle-selfcheck pre-host-selfcheck post-dle-selfcheck post-host-selfcheck pre-dle-estimate pre-host-estimate post-dle-estimate post-host-estimate pre-dle-backup pre-host-backup post-dle-backup post-host-backup
The disk and device arguments to the script are provided only if the script is executed for a DLE.
tool property format
Each property is on one line, the property name followed by all values of the property:
property_name [property_value]+
They are quoted string if needed.
How to use
Scripts are defined in amanda.conf, and then referenced from a dumptype.
Define the script in amanda.conf
Define the "my_script" script using the "myscript" binary.
define script-tool my-script { "script-base" # inherit config of the script-base script-tool comment "a comment" plugin "myscript" # filename of the script, in the dumper dir execute-where server # or client execute-on pre-dle-backup property "mailto" "amandabackup" # can set arbitrary properties }
Use the script in a dumptype
Reference the script-tool with the script parameter:
define dumptype user-tar-scripted { user-tar script "my-script" }
Note that the dumptype declaration must be below the script-tool declaration in the configuation file.
Email example
define script-tool sc-email { comment "email me before this DLE is backed up" plugin "script-email" execute-on pre-dle-backup execute-where server property "mailto" "martinea" } define dumptype user-tar-email { user-tar script "sc-email" }
Complex Examples
Just as you can include dumptypes in a DLE, you can include script-tool definitions in a dumptype:
define dumptype user-tar-email2 { user-tar script { "sc-email" execute-where client execute-on post-dle-backup, post-host-estimate } }
You can even combine all of this in a DLE:
myhost /my/disk { user-tar script { "sc-email" execute-where client execute-on post-dle-backup, post-host-estimate } } -1 local