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:
Current backup or restore level.
Name or IP address of the host machine being dumped or restored.
Full path name to the file system being dumped or restored.
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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