basebackup_to_shell adds a custom basebackup target
called shell. This makes it possible to run
pg_basebackup --target=shell or, depending on how this
module is configured,
pg_basebackup --target=shell:,
and cause a server command chosen by the server administrator to be executed
for each tar archive generated by the backup process. The command will receive
the contents of the archive via standard input.
DETAIL_STRING
This module is primarily intended as an example of how to create a new backup targets via an extension module, but in some scenarios it may be useful for its own sake. In order to function, this module must be loaded via shared_preload_libraries or local_preload_libraries.
basebackup_to_shell.command (string)
The command which the server should execute for each archive generated
by the backup process. If %f occurs in the command
string, it will be replaced by the name of the archive (e.g.
base.tar). If %d occurs in the
command string, it will be replaced by the target detail provided by
the user. A target detail is required if %d is
used in the command string, and prohibited otherwise. For security
reasons, it may contain only alphanumeric characters. If
%% occurs in the command string, it will be replaced
by a single %. If % occurs in
the command string followed by any other character or at the end of the
string, an error occurs.
basebackup_to_shell.required_role (string)
The role required in order to make use of the shell
backup target. If this is not set, any replication user may make use of
the shell backup target.
Robert Haas <rhaas@postgresql.org>