New demo script frontend/xorriso_broker.sh (see Debian bug 805495)
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README
14
README
@ -190,8 +190,18 @@ In particular it connects to xorriso via two pipes, sends commands, waits
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for all replies of a command, picks info out of the xorriso message sieve,
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and parses reply message lines into words.
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The bash script frontend/sh_on_named_pipes.sh forks a xorriso process and
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operates it via two named pipes which it creates.
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The bash script frontend/sh_on_named_pipes.sh forks a xorriso process
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connected to two pipes. It then runs a dialog loop, sends commands to xorriso,
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and displays the replies.
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The sh script frontend/xorriso_broker.sh is intended to execute xorriso
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commands on a permanently running xorriso process.
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It gets an id_string by which it looks for named pipes with a running xorriso
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process. If no such pipe is found, then it starts a xorriso connected to
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newly created pipes.
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After this is done, the optionally given xorriso arguments are written into
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the stdin pipe from where xorriso will read and execute them. The script will
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end but the xorriso process will go on and wait for more commands.
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Drives and Disk File Objects
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203
frontend/xorriso_broker.sh
Executable file
203
frontend/xorriso_broker.sh
Executable file
@ -0,0 +1,203 @@
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#!/bin/sh
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# Copyright (C) 2015
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# Thomas Schmitt <scdbackup@gmx.net>, libburnia-project.org
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# Provided under BSD license: Use, modify, and distribute as you like.
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# set -x
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# ---------------------------- functions ---------------------------
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usage() {
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echo >&2
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echo "usage: $0 "'\' >&2
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echo " [-xorriso path] id_string [-dev] iso_adr [xorriso_arguments ...]" >&2
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echo >&2
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echo " This script looks for named pipe" >&2
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echo ' /tmp/xorriso_stdin_pipe_${id_string}' >&2
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echo " which is supposed to be connected to a xorriso process." >&2
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echo " If not found, the stdin pipe and a stdout pipe get created" >&2
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echo " and a xorriso dialog process gets started and connected." >&2
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echo " Each character in id_string must match [-+:.,=@0-9A-Za-z]." >&2
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echo " If iso_adr differs from the previous run with the same id_string," >&2
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echo " then any changes on the previous ISO are committed as session" >&2
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echo " before command -dev is performed to load the meta data of" >&2
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echo " the newly addressed ISO." >&2
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echo " After this is done, the optionally given xorriso_arguments" >&2
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echo " are written into the stdin pipe from where xorriso will read" >&2
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echo " them as commands and their parameters." >&2
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echo >&2
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}
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# Make filenames safe for transport by wrapping them in quotes and
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# escaping quotes in their text
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xorriso_esc() {
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echo -n "'"
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echo -n "$1" | sed -e "s/'/'"'"'"'"'"'"'/g"
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echo -n "'"
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}
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# Send one or more command lines to xorriso
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xorriso_send_cmd() {
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# $1 : the lines to send
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# >>> is it possible to have a timeout on echo ?
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if test -p "$cmd_pipe"
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then
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echo " $1" >"$cmd_pipe"
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else
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xorriso_is_running=0
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return 1
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fi
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}
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# Send command and wait for answer
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xorriso_cmd_and_result() {
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# $1: command line for xorriso
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# $2: if not empty, grep expression for stdout
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if test "$xorriso_is_running" = 0
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then
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return 1
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fi
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xorriso_send_cmd "$1" || return 1
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if test -n "$2"
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then
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cat "$result_pipe"
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else
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grep "$2" <"$result_pipe"
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fi
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return 0
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}
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# ------------------------------- main -----------------------------
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# Argument interpreter
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if test "$#" -lt 2
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then
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usage "$0"
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exit 1
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fi
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xorriso=xorriso
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if test o"$1" = o"-xorriso"
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then
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xorriso="$2"
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shift 2
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fi
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export xorriso_is_running=0
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if test "$#" -lt 2
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then
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usage "$0"
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exit 1
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fi
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id_string=$(echo "$1" | sed -e 's/[^-+:.,=@0-9A-Za-z]/_/g' )
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shift 1
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# Ignore second argument -dev
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if test o"$1" = o"-dev"
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then
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shift 1
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if test "$#" -lt 1
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then
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usage "$0"
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exit 1
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fi
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fi
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device="$1"
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shift 1
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# Perform the action
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export cmd_pipe=/tmp/xorriso_stdin_pipe_$id_string
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export result_pipe=/tmp/xorriso_stdout_pipe_$id_string
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if test -p "$cmd_pipe"
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then
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xorriso_is_running=1
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else
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xorriso_is_running=0
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fi
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if test "$xorriso_is_running" = "0"
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then
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# xorriso is not started yet
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# Check for xorriso version which knows command -named_pipe_loop
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xorriso_version_req="1.3.2"
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version=$("$xorriso" -version | grep '^xorriso version' |
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sed -e 's/^xorriso version : //')
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smallest=$( (echo "$xorriso_version_req" ; echo "$version" ) | \
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sort | head -1)
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if test "$smallest" = "$xorriso_version_req"
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then
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dummy=dummy
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else
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echo "$0 : FATAL : Need xorriso version >= $xorriso_version_req" >&2
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echo "Found version: $version" >&2
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exit 2
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fi
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mknod "$cmd_pipe" p
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mknod "$result_pipe" p
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"$xorriso" -abort_on NEVER -for_backup \
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-named_pipe_loop cleanup:buffered "$cmd_pipe" "$result_pipe" "-" \
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>&2 &
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# (stdout is redirected to stderr, in order not to keep a pipe waiting for
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# input from the still open stdout copy of the background process.
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# -named_pipe_loop will disconnect xorriso result channel from stdout.)
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xorriso_is_running=1
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fi
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# Inquire current xorriso -dev
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xorriso_device=$(xorriso_cmd_and_result "-status -dev" "^-dev" | \
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sed -e 's/^-dev //')
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if echo " $device" | grep "^ '" >/dev/null
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then
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quoted="$device"
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else
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quoted=$(xorriso_esc "$device")
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fi
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if test "$xorriso_device" = "$quoted"
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then
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dummy=dummy
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else
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# Inquire the need for a -commit command
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pending=$(xorriso_cmd_and_result "-changes_pending show_status" \
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"^-changes_pending" \
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| sed -e 's/^-changes_pending //')
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if test "$pending" = "yes"
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then
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if xorriso_cmd_and_result "-commit"
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then
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dummy=dummy
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else
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exit 1
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fi
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fi
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# Now change ISO filesystem
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if xorriso_cmd_and_result "-dev $device"
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then
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xorriso_device="$device"
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else
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exit 1
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fi
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fi
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test "$*" = "" && exit 0
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if xorriso_cmd_and_result "$*"
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then
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dummy=dummy
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else
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exit 1
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fi
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exit 0
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@ -182,8 +182,18 @@ In particular it connects to xorriso via two pipes, sends commands, waits
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for all replies of a command, picks info out of the xorriso message sieve,
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and parses reply message lines into words.
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The bash script frontend/sh_on_named_pipes.sh forks a xorriso process and
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operates it via two named pipes which it creates.
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The bash script frontend/sh_on_named_pipes.sh forks a xorriso process
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connected to two pipes. It then runs a dialog loop, sends commands to xorriso,
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and displays the replies.
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The sh script frontend/xorriso_broker.sh is intended to execute xorriso
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commands on a permanently running xorriso process.
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It gets an id_string by which it looks for named pipes with a running xorriso
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process. If no such pipe is found, then it starts a xorriso connected to
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newly created pipes.
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After this is done, the optionally given xorriso arguments are written into
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the stdin pipe from where xorriso will read and execute them. The script will
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end but the xorriso process will go on and wait for more commands.
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Drives and Disk File Objects
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