Add comments about how bpipe works

diff --git a/docs/manuals/en/main/newfeatures.tex b/docs/manuals/en/main/newfeatures.tex
index 066fc2acaafe4f5f06814e24c4c88a3736868fb9..d3497dd4962ca85e444abe47412290cbe1aedf4e 100644 (file)
--- a/docs/manuals/en/main/newfeatures.tex
+++ b/docs/manuals/en/main/newfeatures.tex
@@ -1479,6 +1479,9 @@ plugin.
 The {\bf bpipe} plugin is provided in the directory src/plugins/fd/bpipe-fd.c of
 the Bacula source distribution. When the plugin is compiled and linking into
 the resulting dynamic shared object (DSO), it will have the name {\bf bpipe-fd.so}.
+Please note that this is a very simple plugin that was written for
+demonstration and test purposes. It is and can be used in production, but
+that was never really intended.
 
 The purpose of the plugin is to provide an interface to any system program for
 backup and restore. As specified above the {\bf bpipe} plugin is specified in
@@ -1506,13 +1509,24 @@ a conflict with a path and filename that actually exists on your system.
 \item {\bf field3} for the {\bf bpipe} plugin 
 specifies the "reader" program that is called by the plugin during
 backup to read the data. {\bf bpipe} will call this program by doing a
-{\bf popen} on it.
+{\bf popen} on it. 
 
 \item {\bf field4} for the {\bf bpipe} plugin
 specifies the "writer" program that is called by the plugin during
 restore to write the data back to the filesystem.  
 \end{description}
 
+Please note that for two items above describing the "reader" and "writer"
+fields, these programs are "executed" by Bacula, which
+means there is no shell interpretation of any command line arguments
+you might use.  If you want to use shell characters (redirection of input
+or output, ...), then we recommend that you put your command or commands
+in a shell script and execute the script. In addition if you backup a
+file with the reader program, when running the writer program during
+the restore, Bacula will not automatically create the path to the file.
+Either the path must exist, or you must explicitly do so with your command
+or in a shell script.
+
 Putting it all together, the full plugin directive line might look
 like the following: