(tar.info.gz) User Hooks
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5.4.3 User Hooks
----------------
"User hooks" are shell functions executed before and after each 'tar'
invocation. Thus, there are "backup hooks", which are executed before
and after dumping each file system, and "restore hooks", executed before
and after restoring a file system. Each user hook is a shell function
taking four arguments:
-- User Hook Function: hook LEVEL HOST FS FSNAME
Its arguments are:
LEVEL
Current backup or restore level.
HOST
Name or IP address of the host machine being dumped or
restored.
FS
Full file name of the file system being dumped or restored.
FSNAME
File system name with directory separators replaced with
colons. This is useful, e.g., for creating unique files.
Following variables keep the names of user hook functions:
-- Backup variable: DUMP_BEGIN
Dump begin function. It is executed before dumping the file
system.
-- Backup variable: DUMP_END
Executed after dumping the file system.
-- Backup variable: RESTORE_BEGIN
Executed before restoring the file system.
-- Backup variable: RESTORE_END
Executed after restoring the file system.
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