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#!/usr/bin/wish
#
# xorriso-tcltk
# Copyright (C) 2012 - 2015
# Thomas Schmitt <scdbackup@gmx.net>, libburnia project.
# Provided under BSD license: Use, modify, and distribute as you like.
#
# This is mainly a proof of concept for xorriso serving under a frontend.
# It exercises several fundamental gestures of communication:
# - connecting via two named pipes
# - sending commands
# - receiving replies
# - inquiring the xorriso message sieve
# - using the xorriso parsing service
# Note that any other language than Tcl/Tk could be used, if it only can
# do i/o via standard input and standard output or via named pipes.
# Further it has to perform integer arithmetics and string manipulations.
# And, well, a graphical widget set would be nice.
set own_version "1.4.1"
# Minimum version of xorriso to be used as backend process.
# Older versions of xorriso do not offer commands -msg_op and -launch_frontend
set min_xorriso_version "1.2.6"
proc print_usage {argv0} {
puts stderr "Usage:"
puts stderr " $argv0 \[options\]"
puts stderr "Options:"
puts stderr " All options must be given with two dashes (\"--option\") in"
puts stderr " order to distinguish them from any options of the Tcl shell."
puts stderr " --help"
puts stderr " Print this text and exit."
puts stderr " --stdio"
puts stderr " Establish connection to xorriso via stdin and stdout."
puts stderr " E.g. when letting xorriso start this frontend program:"
puts stderr " xorriso -launch_frontend \$(which xorriso-tcltk) --stdio --"
puts stderr " --named_pipes cmd_fifo reply_fifo"
puts stderr " Establish connection to a xorriso process started by:"
puts stderr " xorriso -dialog on <cmd_fifo >reply_fifo"
puts stderr " which is then ready for a run of:"
puts stderr " xorriso-tcltk --named_pipes cmd_fifo reply_fifo"
puts stderr " It is important that the parent of xorriso and of this"
puts stderr " tcl/tk frontend opens the named pipe for commands before"
puts stderr " it opens the named pipe for replies. This avoids deadlock."
puts stderr " --silent_start"
puts stderr " Do not issue the start message xorriso-tcltk-version."
puts stderr " This works only if --silent_start is the first argument."
puts stderr " --no_extract"
puts stderr " Do not allow extraction of files from ISO filesystem to"
puts stderr " hard disk. This is not revokable during the program run."
puts stderr " --no_bwidget"
puts stderr " Do not try to load the Tcl/Tk package BWidget which is"
puts stderr " a prerequisite for the \"/\" file browser buttons."
puts stderr " --geometry {+|-}X{+|-}Y"
puts stderr " Sets the position of the main window."
puts stderr " --click_to_focus"
puts stderr " Chooses that input fields and list boxes get the keyboard"
puts stderr " focus only when being clicked by the mouse. (Default)"
puts stderr " --auto_focus"
puts stderr " Chooses that the keyboard focus is where the mouse"
puts stderr " pointer is."
puts stderr " --pipe_log_file path"
puts stderr " Set a file address for logging of xorriso commands and"
puts stderr " reply messages and enable this logging."
puts stderr " The log lines will be appended. Path \"-\" means stderr."
puts stderr " --script_log_file path"
puts stderr " Set a file address for logging of essential xorriso"
puts stderr " commands and enable this logging."
puts stderr " The log lines will be appended. Path \"-\" means stderr."
puts stderr " --script_log_all_commands"
puts stderr " With logging of commands log non-essential commands too."
puts stderr " --use_command_move"
puts stderr " Use xorriso command -move for the \"Move to:\" button"
puts stderr " if xorriso version is >= 1.2.8"
puts stderr " --use_command_mv"
puts stderr " Use xorriso command -mv for the \"Move to:\" button."
puts stderr ""
puts stderr "If neither --stdio nor --named_pipes is given, then this script"
puts stderr "will try to locate itself in the filesystem and start a xorriso"
puts stderr "run that launches it again."
puts stderr ""
puts stderr "In the running GUI, click with the rightmost mouse button on"
puts stderr "any GUI element to get its particular help text."
puts stderr ""
}
# ------------------------------- the frontend ----------------------------
#
# Connects to a xorriso process, sends commands, receives replies,
# prepares replies for GUI
# Connection to xorriso
set cmd_conn ""
set reply_conn ""
# The addresses of the named pipes, if such are used (see option -named_pipe)
set cmd_pipe_adr ""
set reply_pipe_adr ""
# The command to send (resp. the command most recently sent)
set cmdline ""
# Wether to clear the cmdline after sending
set cmdline_clear true
# Command counter
set cmd_sent 0
# Current -mark synchronization text
set mark_count 0
# Results of most recent await_all_replies
set info_list ""
set info_count 0
set emerging_info ""
set result_list ""
set result_count 0
set emerging_result ""
# Highest severities encountered in total and with most recent command
set highest_total_sev ALL
set highest_total_sev_msg ""
set highest_cmd_sev ALL
set highest_cmd_sev_msg ""
# This one registers like highest_cmd_sev with threshold ALL
set highest_seen_cmd_sev ALL
# State of last read_sieve command
set sieve_ret 0
# How many texts to pass with one parse_bulk command
set bulk_parse_max_chunk 200
# Parse parameters
set bulk_parse_prefix ""
set bulk_parse_separators ""
set bulk_parse_max_words ""
set bulk_parse_flag ""
# The announced number of texts to parse
set bulk_parse_num_texts ""
# Whether to complain on stderr about broken pipes.
# This may be expected when xorriso is being shut down by this frontend.
set expect_broken_pipes "0"
# Whether to use command -move rather than -mv. Possible since xorriso-1.2.8.
set use_command_move 1
# Whether to enable -hardlinks mode "on". Too slow before xorriso-1.3.0.
set use_command_hardlinks_on 1
# Local copies of xorriso state
# Addresses of drives (or image files) as shown by their text fields in the GUI
set outdev_adr ""
set indev_adr ""
# Addresses of drives (or image files) as set in xorriso (after inquire_dev)
set eff_outdev_adr ""
set eff_indev_adr ""
# Whether the medium is blank, appendable, closed, missing
set indev_medium_status "missing"
set outdev_medium_status "missing"
# What kind of medium is presented by the drive
set indev_profile ""
set outdev_profile ""
# List of known drive addresses
set devlist ""
# Intermediate storage for messages until the GUI is up with .msglist box
set pre_msglist ""
# Whether overwriting of files in the ISO model is allowed
set overwrite_iso_files 1
# If overwrite_iso_files is 1: Wether overwriting of ISO directories is allowed
set overwrite_iso_dirs 0
# Whether overwriting of files on disk is allowed
set overwrite_disk_files 0
# The file where to log commands and replies for debugging purposes
set debug_log_file ""
set debug_log_conn stderr
# Whether to log all commands and replies to the debug_log_file
set debug_logging 0
# The result of the most recent isofs_ls run
set isofs_ls_result ""
# The result of the most recent localfs_ls run
set localfs_ls_result ""
# The communication channel where to log files (if it is not the empty text)
set cmd_log_conn ""
# The address under which cmd_log_conn was opened
set cmd_log_target ""
# Whether to log essential commands: 0=off , 1=no extract , 2=with extract
set cmd_logging_mode 0
# Whether to log all commands if cmd_logging_mode is 1: 0=off , 1=on
set cmd_logging_all 0
# The last logged -cd path. Used to prevent redundant logging of -cd.
set recent_cd_path ""
# The file address and the channel for xorriso command script execution
set execute_script_adr ""
set execute_script_conn ""
# Whether extraction to disk shall be allowed in scripts
set script_with_osirrox 0
# Whether extraction to disk is allowed
set osirrox_allowed 1
# xorriso specific constants
# List of severities (gets later overridden by -msg_op list_sev -)
set xorriso_severity_list {
ALL DEBUG UPDATE NOTE HINT WARNING SORRY MISHAP FAILURE FATAL ABORT NEVER
}
set scan_event_threshold HINT
# --------- Communication between frontend and xorriso ----------
# Open the connection to a pair of named pipes. Program option -named_pipes
#
proc init_frontend_named_pipes {cmd_pipe reply_pipe} {
global cmd_conn
global reply_conn
set cmd_conn [open $cmd_pipe w]
set reply_conn [open $reply_pipe r]
# Note: disencouraged flags would be necessary for opening idle fifo
# set reply_conn [open $reply_pipe {RDONLY NONBLOCK}]
}
# Send a command line to the xorriso process. Do not wait for reply.
#
proc send_async_cmd {cmd} {
global cmd_sent cmd_conn debug_logging debug_log_conn
display_busy 1
log_command $cmd 0
debug_log_puts \
" =============================================================="
debug_log_puts " $cmd"
display_msg "======> $cmd"
incr cmd_sent
puts $cmd_conn $cmd
flush $cmd_conn
}
# Send a command line and a -mark command to xorriso. Wait until the
# mark message confirms that all command output has been received.
#
proc send_marked_cmd {cmd} {
global cmd_conn mark_count
send_async_cmd $cmd
incr mark_count
set mark_cmd "-mark $mark_count"
debug_log_puts " $mark_cmd"
puts $cmd_conn $mark_cmd
flush $cmd_conn
await_all_replies
}
# Send a command and make it a candidate for the log script
#
proc send_loggable_cmd {cmd} {
log_command $cmd 1
send_marked_cmd $cmd
}
# Send a command that shall not be displayed in the message log
#
proc send_silent_cmd {cmd} {
set disp_en_mem [set_display_msg 0]
send_marked_cmd $cmd
set_display_msg $disp_en_mem
}
# Wait for the currently pending mark message to arrive.
# Buffer all received result lines and info messages.
#
proc await_all_replies {} {
global reply_conn mark_count result_count result_list
global info_count info_list expect_broken_pipes
global .busy_text
clear_reply_lists
while {1} {
set ret [gets $reply_conn line]
if {$ret < 0} {
if {$expect_broken_pipes != 1} {
puts stderr "EOF at reply pipe"
}
break
}
debug_log_puts $line
if {[string range $line 0 0] == "M"} {
if {[string range $line 5 end] == $mark_count} {
break
} else {
# outdated mark message
continue
}
}
de_pkt_line $line
}
display_busy 0
}
# Decode -pkt_output format to complete lines and buffer them.
#
proc de_pkt_line {line} {
global info_list
global info_count
global emerging_info
global result_list
global result_count
global emerging_result
# Distinguish R and I
set ch [string range $line 0 0]
set payload [string range $line 5 end]
if {$ch == "R"} {
set emerging_result "$emerging_result$payload"
} else { if {$ch == "I"} {
set emerging_info "$emerging_info$payload"
} else {
return ""
}}
# if line end : add to list
if {[string range $line 2 2] == "1"} {
if {$ch == "R"} {
lappend result_list $emerging_result
incr result_count
display_msg $emerging_result
set emerging_result ""
} else {
lappend info_list $emerging_info
incr info_count
display_msg $emerging_info
scan_info_for_event $emerging_info
set emerging_info ""
}
}
}
# Search in the decoded info messages for the most severe event reports.
#
proc scan_info_for_event {line} {
global highest_total_sev highest_total_sev_msg
global highest_cmd_sev highest_cmd_sev_msg highest_seen_cmd_sev
global scan_event_threshold
global display_msg_enabled
# check for word : CAPS : text ...
set ret [regexp {[a-z][a-z]*[ ]*: [A-Z][A-Z]* :} $line]
if {$ret != 1} {return ""}
# retrieve severity
set pos [string first ":" $line]
set sev [string range $line [expr $pos+2] end]
set pos [string first ":" $sev]
set sev [string range $sev 0 [expr $pos-2]];
if {[compare_sev $sev $highest_seen_cmd_sev] > 0} {
set highest_seen_cmd_sev $sev
}
if {[compare_sev $sev $scan_event_threshold] < 0} {return ""}
if {$display_msg_enabled == 0} {
set display_msg_enabled 1
display_msg $line
set display_msg_enabled 0
}
if {[compare_sev $sev $highest_total_sev] >= 0} {
set highest_total_sev $sev
set highest_total_sev_msg [escape_newline $line 0]
}
if {[compare_sev $sev $highest_cmd_sev] >= 0} {
set highest_cmd_sev $sev
set highest_cmd_sev_msg [escape_newline $line 0]
}
}
# Unpack the output format of -msg_op read_sieve into a result_list
# of strings which each hold one parsed word.
#
proc de_sieve {} {
global result_list
global sieve_ret
set sieve_ret [lindex $result_list 0]
set sieve_result_count [lindex $result_list 1]
set payload ""
set sieve_result_count 0
for {set i 2} {$i < [llength $result_list]} {incr i} {
set line ""
set num_lines [lindex $result_list $i]
for {set j 0} {$j < $num_lines} {incr j} {
incr i
set line "$line[lindex $result_list $i]"
if {$j < $num_lines - 1} {
set line "$line\n"
} else {
lappend payload $line
incr sieve_result_count
}
}
}
set result_list $payload
set result_count $sieve_result_count
}
# Alternative to proc await_all_replies. It waits for a line at one of the
# three channels and displays all lines which it receives before that line.
# Used before this frontend had the opportunity to set up xorriso by commands
# like -pkt_output "on".
#
proc wait_for_msg {prefix channel} {
global reply_conn
if {$channel == "M"} {
set channel_prefix "M:0: "
} else {
set channel_prefix "$channel:1: "
}
set prefix_l [string length $prefix]
while {1} {
# >>> Have a timeout
set ret [gets $reply_conn line]
if {$ret < 0} {
break
}
debug_log_puts $line
if {[string length $line] < $prefix_l} {
display_msg $line
continue
}
if {[string range $line 0 [expr $prefix_l-1]] == $prefix} {
return [string range $line $prefix_l end]
}
if {[string length $line] >= [expr $prefix_l+5]} {
if {[string range $line 0 4] == $channel_prefix} {
if {[string range $line 5 [expr $prefix_l+4]] == $prefix} {
return [string range $line [expr $prefix_l+5] end]
}
}
}
display_msg $line
}
}
# Reset the buffer for result lines and info messages.
#
proc clear_reply_lists {} {
global info_list
global info_count
global emerging_info
global result_list
global result_count
global emerging_result
set info_list ""
set info_count 0
set emerging_info ""
set result_list ""
set result_count 0
set emerging_result ""
}
# Reset the register of the most severe event for command sequences.
# Typically this is done before executing the commands of a procedure
# that is triggered by the user interface.
#
proc reset_highest_cmd_sev {} {
global highest_cmd_sev highest_cmd_sev_msg highest_seen_cmd_sev
set highest_cmd_sev ALL
set highest_cmd_sev_msg ""
set highest_seen_cmd_sev ALL
}
# Clear the recordings of the xorriso message sieve.
#
proc clear_sieve {} {
send_silent_cmd "-msg_op clear_sieve -"
}
# Obtain a recorded item from the xorriso message sieve.
#
proc read_sieve {name} {
send_silent_cmd "-msg_op read_sieve '$name'"
de_sieve
}
# ------- Inquiring xorriso status -------
# Get more information about drive that was inquired by recent -toc_of.
#
proc obtain_drive_info {dev} {
global result_list
global sieve_ret
global indev_medium_status outdev_medium_status
global indev_profile outdev_profile
set line ""
if {$dev == "in"} {
set indev_medium_status "missing"
set indev_profile ""
} else {
set outdev_medium_status "missing"
set outdev_profile ""
}
read_sieve "Media status :"
if {$sieve_ret > 0} {
set reply [lindex $result_list 0]
foreach i {blank appendable closed} {
if {[string first $i $reply] != -1} {
set line "$i "
if {$dev == "in"} {
set indev_medium_status $i
} else {
set outdev_medium_status $i
}
break
}
}
}
read_sieve "Media current:"
if {$sieve_ret > 0} {
set profile [lindex $result_list 0]
if {$profile == "is not recognizable"} {
set profile "no recognizable medium"
set line "$line$profile"
return $line
} else {
set line "$line$profile, "
if {$dev == "in"} {
set indev_profile $profile
} else {
set outdev_profile $profile
}
}
}
read_sieve "Media summary:"
if {$sieve_ret > 0} {
set line "$line[lindex $result_list 0] sessions, "
if {$dev == "in"} {
set line "$line[lindex $result_list 2] used"
} else {
set line "$line[lindex $result_list 3] free"
}
}
return $line
}
# Inquire whether changes of the ISO image are pending.
# This is a precondition for writing the session. Vice versa pending changes
# block a change of the input drive or the program end.
#
proc changes_are_pending {} {
global result_count result_list
send_silent_cmd "-changes_pending show_status"
if {$result_count >= 1} {
if {[lindex $result_list 0] == "-changes_pending no"} {
return "0"
}
return "1"
}
return ""
}
# Inquire whether an ISO image model has been created inside xorriso.
# This is a precondition for inserting files into the ISO tree model.
#
proc assert_iso_image {with_msg} {
global highest_seen_cmd_sev scan_event_threshold
set highest_seen_cmd_sev ""
set set_mem $scan_event_threshold
set scan_event_threshold "FATAL"
send_silent_cmd "-lsd / --"
set scan_event_threshold $set_mem
if {[compare_sev $highest_seen_cmd_sev "FAILURE"] >= 0} {
if {$with_msg == 1} {
xorriso_tcltk_errmsg "xorriso-tcltk : SORRY : First you need to create or load an ISO image by selecting a drive or an image file"
}
return "0"
}
return "1"
}
# Obtain the list of possible event severity names, sorted in ascending order
#
proc inquire_severity_list {} {
global xorriso_severity_list
global result_list
set disp_en_mem [set_display_msg 0]
send_marked_cmd "-msg_op list_sev -"
set_display_msg $disp_en_mem
if {[lindex $result_list 0] != ""} {
set xorriso_severity_list [split [lindex $result_list 0] " "]
}
}
# Parse-by-xorriso handler function for proc inquire_dev
#
proc set_inquired_dev {} {
global result_list eff_indev_adr eff_outdev_adr
if {[llength $result_list] < 2} {return ""}
set what [lindex $result_list 0]
if {$what == "-dev" || $what == "-indev"} {
set eff_indev_adr [lindex $result_list 1]
}
if {$what == "-dev" || $what == "-outdev"} {
set eff_outdev_adr [lindex $result_list 1]
}
}
# Inquire -indev and -outdev from xorriso and install in eff_indev_adr
# and eff_outdev_adr.
# (This could be done by -toc_of like in proc refresh_indev. But here
# i demonstrate the use of command -status and parsing its result by
# help of xorriso.)
#
proc inquire_dev {} {
set disp_en_mem [set_display_msg 0]
send_marked_cmd "-status -dev"
handle_result_list set_inquired_dev "''" "''" 2 0
set_display_msg $disp_en_mem
update idletasks
return ""
}
# Inquire -indev and -outdev from xorriso and install in indev_adr
# and outdev_adr.
#
proc update_dev_var {} {
global result_list eff_indev_adr eff_outdev_adr indev_adr outdev_adr
inquire_dev
set indev_adr $eff_indev_adr
set outdev_adr $eff_outdev_adr
}
# Parse-by-xorriso handler function for proc isofs_ls
#
proc isofs_ls_handler {} {
global result_list isofs_ls_result
if {[lindex $result_list 0] == "total"} {return ""}
lappend isofs_ls_result \
"[string range [lindex $result_list 0] 0 0] [lindex $result_list 8]"
}
# Produce a list of all files in a directory of the ISO model
#
proc isofs_ls {dir} {
global isofs_ls_result
set isofs_ls_result ""
set disp_en_mem [set_display_msg 0]
send_marked_cmd "-lsl [make_text_shellsafe $dir]"
handle_result_list isofs_ls_handler "''" "''" 0 0
set_display_msg $disp_en_mem
return $isofs_ls_result
}
# Tells the file type of an absolute path in the ISO model.
# Indicator characters like with ls -l. Empty text means non existing file.
#
proc isofs_filetype {path} {
global result_list result_count scan_event_threshold
set scan_event_mem $scan_event_threshold
set scan_event_threshold "SORRY"
send_silent_cmd "-lsdl [make_text_shellsafe $path]"
set scan_event_threshold $scan_event_mem
if {$result_count < 1} {return ""}
return [string range [lindex $result_list 0] 0 0]
}
# Inspection of hard disk is done via xorriso.
# The xorriso commands have the advantage to be always available and to
# need no unescaping. On the other hand, shell and tcl lstat would be
# faster with large directories.
# Parse-by-xorriso handler function for proc localfs_ls
#
proc localfs_ls_handler {} {
global result_list localfs_ls_result
if {[lindex $result_list 0] == "total"} {return ""}
lappend localfs_ls_result \
"[string range [lindex $result_list 0] 0 0] [lindex $result_list 8]"
}
# Return the list of files of a hard disk filesystem directory
#
proc localfs_ls {dir} {
global localfs_ls_result
set localfs_ls_result ""
if {[localfs_filetype $dir] != "d"} {return ""}
set disp_en_mem [set_display_msg 0]
send_marked_cmd "-lslx [make_text_shellsafe $dir]"
handle_result_list localfs_ls_handler "''" "''" 0 0
set_display_msg $disp_en_mem
return $localfs_ls_result
}
# Tells the file type of an absolute path in the ISO model.
# Indicator characters like with ls -l. Empty text means non existing file.
#
proc localfs_filetype {path} {
global result_list result_count scan_event_threshold
set scan_event_mem $scan_event_threshold
set scan_event_threshold "SORRY"
send_silent_cmd "-lsdlx [make_text_shellsafe $path]"
set scan_event_threshold $scan_event_mem
if {[llength $result_list] < 1} {return ""}
return [string range [lindex $result_list 0] 0 0]
}
# Verify that the connected process runs a xorriso program that is modern
# enough. This is done before sending xorriso the setup commands.
#
proc check_xorriso_version {} {
global sieve_ret result_list pre_msglist xorriso_version min_xorriso_version
global use_command_move use_command_hardlinks_on
global reply_conn
set version "0.0.0 (= unknown)"
set disp_en_mem [set_display_msg 0]
# In order to see the pre-frontend messages of xorriso
# set an individual -mark and use send_async_cmd
set mark_text "xorriso-tcltk-version-check-[clock seconds]"
send_async_cmd "-mark [make_text_shellsafe $mark_text]"
set_display_msg $disp_en_mem
wait_for_msg $mark_text "M"
set_display_msg 0
send_async_cmd "-version"
set xorriso_version [wait_for_msg "xorriso version : " "R"]
if {$xorriso_version < $min_xorriso_version} {
puts stderr "xorriso-tcltk: xorriso-$xorriso_version is too old."
puts stderr "xorriso-tcltk: Need at least version $min_xorriso_version"
window_ack \
"xorriso-$xorriso_version is too old. Need at least version $min_xorriso_version" \
"red" "embedded"
central_exit 2
}
if {$xorriso_version < "1.2.8"} {
set use_command_move 0
}
if {$xorriso_version < "1.3.0"} {
set use_command_hardlinks_on 0
}
set_display_msg $disp_en_mem
}
# Commands which bring the connected xorriso process into the state that
# is expected by this frontend.
#
proc setup_xorriso {} {
global osirrox_allowed
set cmd ""
# Invalidate possible -mark 1
set cmd "$cmd -mark 0"
# Make replies digestible for await_all_replies
set cmd "$cmd -pkt_output on"
# Report version early
set cmd "$cmd -version"
# This frontend relies heavily on the message sieve
set cmd "$cmd -msg_op start_sieve -"
# -reassure questions from xorriso would not be properly handled by
# this frontend
set cmd "$cmd -reassure off"
set cmd "$cmd -abort_on NEVER"
set cmd "$cmd -return_with ABORT 32"
set cmd "$cmd -report_about UPDATE"
set cmd "$cmd -iso_rr_pattern off"
set cmd "$cmd -disk_pattern off"
if {$osirrox_allowed == 0} {
set cmd "$cmd -osirrox banned"
}
set cmd "$cmd [xorriso_loggable_init_cmds]"
send_marked_cmd $cmd
inquire_severity_list
}
# Commands which should also be at the start of a log script
#
proc xorriso_loggable_init_cmds {} {
global use_command_hardlinks_on
set cmd "-for_backup"
# Before xorriso-1.3.0 there is a performance problem with -hardlinks "on"
# and image manipulations before xorriso-1.3.0.
if {$use_command_hardlinks_on == 0} {
set cmd "$cmd -hardlinks off"
} else {
set cmd "$cmd -hardlinks on"
}
set cmd "$cmd -backslash_codes on"
set cmd "$cmd -follow mount:limit=100"
return $cmd
}
proc effectuate_permission_policy {} {
global permission_policy
if {$permission_policy == "readable"} {
send_loggable_cmd \
"-find / -exec chmod a+r -- -find / -type d -exec chmod a+x --"
}
if {$permission_policy == "readonly"} {
send_loggable_cmd \
"-find / -exec chmod a=r -- -find / -type d -exec chmod a+x --"
}
if {$permission_policy == "mkisofs_r"} {
send_loggable_cmd \
"-find / -exec mkisofs_r"
}
}
# ------ Parsing by help of xorriso ------
# Parsing by xorriso takes from the frontend the burden to understand
# and implement the quoting rules of xorriso input and output.
# Lines which are supposed to consist of several words get sent to
# xorriso command -msg_op. The result lines of this command encode
# the words unambigously in one or more text lines.
# This is supposed to be safe for even the weirdest file names.
# Only NUL characters cannot be part of names.
# Start a bulk parser job by which xorriso shall split the output of e.g. -lsl