New demo script frontend/xorriso_broker.sh (see Debian bug 805495)

master
Thomas Schmitt 7 years ago
parent 1d1adb9459
commit 21c2b5cd33
  1. 14
      README
  2. 203
      frontend/xorriso_broker.sh
  3. 14
      xorriso/README_gnu_xorriso

@ -190,8 +190,18 @@ In particular it connects to xorriso via two pipes, sends commands, waits
for all replies of a command, picks info out of the xorriso message sieve,
and parses reply message lines into words.
The bash script frontend/sh_on_named_pipes.sh forks a xorriso process and
operates it via two named pipes which it creates.
The bash script frontend/sh_on_named_pipes.sh forks a xorriso process
connected to two pipes. It then runs a dialog loop, sends commands to xorriso,
and displays the replies.
The sh script frontend/xorriso_broker.sh is intended to execute xorriso
commands on a permanently running xorriso process.
It gets an id_string by which it looks for named pipes with a running xorriso
process. If no such pipe is found, then it starts a xorriso connected to
newly created pipes.
After this is done, the optionally given xorriso arguments are written into
the stdin pipe from where xorriso will read and execute them. The script will
end but the xorriso process will go on and wait for more commands.
Drives and Disk File Objects

@ -0,0 +1,203 @@
#!/bin/sh
# Copyright (C) 2015
# Thomas Schmitt <scdbackup@gmx.net>, libburnia-project.org
# Provided under BSD license: Use, modify, and distribute as you like.
# set -x
# ---------------------------- functions ---------------------------
usage() {
echo >&2
echo "usage: $0 "'\' >&2
echo " [-xorriso path] id_string [-dev] iso_adr [xorriso_arguments ...]" >&2
echo >&2
echo " This script looks for named pipe" >&2
echo ' /tmp/xorriso_stdin_pipe_${id_string}' >&2
echo " which is supposed to be connected to a xorriso process." >&2
echo " If not found, the stdin pipe and a stdout pipe get created" >&2
echo " and a xorriso dialog process gets started and connected." >&2
echo " Each character in id_string must match [-+:.,=@0-9A-Za-z]." >&2
echo " If iso_adr differs from the previous run with the same id_string," >&2
echo " then any changes on the previous ISO are committed as session" >&2
echo " before command -dev is performed to load the meta data of" >&2
echo " the newly addressed ISO." >&2
echo " After this is done, the optionally given xorriso_arguments" >&2
echo " are written into the stdin pipe from where xorriso will read" >&2
echo " them as commands and their parameters." >&2
echo >&2
}
# Make filenames safe for transport by wrapping them in quotes and
# escaping quotes in their text
xorriso_esc() {
echo -n "'"
echo -n "$1" | sed -e "s/'/'"'"'"'"'"'"'/g"
echo -n "'"
}
# Send one or more command lines to xorriso
xorriso_send_cmd() {
# $1 : the lines to send
# >>> is it possible to have a timeout on echo ?
if test -p "$cmd_pipe"
then
echo " $1" >"$cmd_pipe"
else
xorriso_is_running=0
return 1
fi
}
# Send command and wait for answer
xorriso_cmd_and_result() {
# $1: command line for xorriso
# $2: if not empty, grep expression for stdout
if test "$xorriso_is_running" = 0
then
return 1
fi
xorriso_send_cmd "$1" || return 1
if test -n "$2"
then
cat "$result_pipe"
else
grep "$2" <"$result_pipe"
fi
return 0
}
# ------------------------------- main -----------------------------
# Argument interpreter
if test "$#" -lt 2
then
usage "$0"
exit 1
fi
xorriso=xorriso
if test o"$1" = o"-xorriso"
then
xorriso="$2"
shift 2
fi
export xorriso_is_running=0
if test "$#" -lt 2
then
usage "$0"
exit 1
fi
id_string=$(echo "$1" | sed -e 's/[^-+:.,=@0-9A-Za-z]/_/g' )
shift 1
# Ignore second argument -dev
if test o"$1" = o"-dev"
then
shift 1
if test "$#" -lt 1
then
usage "$0"
exit 1
fi
fi
device="$1"
shift 1
# Perform the action
export cmd_pipe=/tmp/xorriso_stdin_pipe_$id_string
export result_pipe=/tmp/xorriso_stdout_pipe_$id_string
if test -p "$cmd_pipe"
then
xorriso_is_running=1
else
xorriso_is_running=0
fi
if test "$xorriso_is_running" = "0"
then
# xorriso is not started yet
# Check for xorriso version which knows command -named_pipe_loop
xorriso_version_req="1.3.2"
version=$("$xorriso" -version | grep '^xorriso version' |
sed -e 's/^xorriso version : //')
smallest=$( (echo "$xorriso_version_req" ; echo "$version" ) | \
sort | head -1)
if test "$smallest" = "$xorriso_version_req"
then
dummy=dummy
else
echo "$0 : FATAL : Need xorriso version >= $xorriso_version_req" >&2
echo "Found version: $version" >&2
exit 2
fi
mknod "$cmd_pipe" p
mknod "$result_pipe" p
"$xorriso" -abort_on NEVER -for_backup \
-named_pipe_loop cleanup:buffered "$cmd_pipe" "$result_pipe" "-" \
>&2 &
# (stdout is redirected to stderr, in order not to keep a pipe waiting for
# input from the still open stdout copy of the background process.
# -named_pipe_loop will disconnect xorriso result channel from stdout.)
xorriso_is_running=1
fi
# Inquire current xorriso -dev
xorriso_device=$(xorriso_cmd_and_result "-status -dev" "^-dev" | \
sed -e 's/^-dev //')
if echo " $device" | grep "^ '" >/dev/null
then
quoted="$device"
else
quoted=$(xorriso_esc "$device")
fi
if test "$xorriso_device" = "$quoted"
then
dummy=dummy
else
# Inquire the need for a -commit command
pending=$(xorriso_cmd_and_result "-changes_pending show_status" \
"^-changes_pending" \
| sed -e 's/^-changes_pending //')
if test "$pending" = "yes"
then
if xorriso_cmd_and_result "-commit"
then
dummy=dummy
else
exit 1
fi
fi
# Now change ISO filesystem
if xorriso_cmd_and_result "-dev $device"
then
xorriso_device="$device"
else
exit 1
fi
fi
test "$*" = "" && exit 0
if xorriso_cmd_and_result "$*"
then
dummy=dummy
else
exit 1
fi
exit 0

@ -182,8 +182,18 @@ In particular it connects to xorriso via two pipes, sends commands, waits
for all replies of a command, picks info out of the xorriso message sieve,
and parses reply message lines into words.
The bash script frontend/sh_on_named_pipes.sh forks a xorriso process and
operates it via two named pipes which it creates.
The bash script frontend/sh_on_named_pipes.sh forks a xorriso process
connected to two pipes. It then runs a dialog loop, sends commands to xorriso,
and displays the replies.
The sh script frontend/xorriso_broker.sh is intended to execute xorriso
commands on a permanently running xorriso process.
It gets an id_string by which it looks for named pipes with a running xorriso
process. If no such pipe is found, then it starts a xorriso connected to
newly created pipes.
After this is done, the optionally given xorriso arguments are written into
the stdin pipe from where xorriso will read and execute them. The script will
end but the xorriso process will go on and wait for more commands.
Drives and Disk File Objects

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