1 if [ ! "$_COMMON_SUBR" ]; then _COMMON_SUBR=1
3 # Copyright (c) 2012 Ron McDowell
4 # Copyright (c) 2012-2014 Devin Teske
7 # Redistribution and use in source and binary forms, with or without
8 # modification, are permitted provided that the following conditions
10 # 1. Redistributions of source code must retain the above copyright
11 # notice, this list of conditions and the following disclaimer.
12 # 2. Redistributions in binary form must reproduce the above copyright
13 # notice, this list of conditions and the following disclaimer in the
14 # documentation and/or other materials provided with the distribution.
16 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 ############################################################ CONFIGURATION
33 # Default file descriptors to link to stdout/stderr for passthru allowing
34 # redirection within a sub-shell to bypass directly to the terminal.
36 : ${TERMINAL_STDOUT_PASSTHRU:=3}}
37 : ${TERMINAL_STDERR_PASSTHRU:=4}}
39 ############################################################ GLOBALS
53 # Global exit status variables
59 # Operating environment details
61 export UNAME_S="$( uname -s )" # Operating System (i.e. FreeBSD)
62 export UNAME_P="$( uname -p )" # Processor Architecture (i.e. i386)
63 export UNAME_M="$( uname -m )" # Machine platform (i.e. i386)
64 export UNAME_R="$( uname -r )" # Release Level (i.e. X.Y-RELEASE)
67 # Default behavior is to call f_debug_init() automatically when loaded.
69 : ${DEBUG_SELF_INITIALIZE=1}
72 # Default behavior of f_debug_init() is to truncate $debugFile (set to NULL to
73 # disable truncating the debug file when initializing). To get child processes
74 # to append to the same log file, export this variarable (with a NULL value)
75 # and also export debugFile with the desired value.
77 : ${DEBUG_INITIALIZE_FILE=1}
80 # Define standard optstring arguments that should be supported by all programs
81 # using this include (unless DEBUG_SELF_INITIALIZE is set to NULL to prevent
82 # f_debug_init() from autamatically processing "$@" for the below arguments):
85 # D: Sets $debugFile to $OPTARG
90 # The getopts builtin will return 1 either when the end of "$@" or the first
91 # invalid flag is reached. This makes it impossible to determine if you've
92 # processed all the arguments or simply have hit an invalid flag. In the cases
93 # where we want to tolerate invalid flags (f_debug_init() for example), the
94 # following variable can be appended to your optstring argument to getopts,
95 # preventing it from prematurely returning 1 before the end of the arguments.
97 # NOTE: This assumes that all unknown flags are argument-less.
99 GETOPTS_ALLFLAGS="abcdefghijklmnopqrstuvwxyz"
100 GETOPTS_ALLFLAGS="${GETOPTS_ALLFLAGS}ABCDEFGHIJKLMNOPQRSTUVWXYZ"
101 GETOPTS_ALLFLAGS="${GETOPTS_ALLFLAGS}0123456789"
104 # When we get included, f_debug_init() will fire (unless $DEBUG_SELF_INITIALIZE
105 # is set to disable automatic initialization) and process "$@" for a few global
106 # options such as `-d' and/or `-D file'. However, if your program takes custom
107 # flags that take arguments, this automatic processing may fail unexpectedly.
109 # The solution to this problem is to pre-define (before including this file)
110 # the following variable (which defaults to NULL) to indicate that there are
111 # extra flags that should be considered when performing automatic processing of
112 # globally persistent flags.
116 ############################################################ FUNCTIONS
118 # f_dprintf $format [$arguments ...]
120 # Sensible debug function. Override in ~/.bsdconfigrc if desired.
121 # See /usr/share/examples/bsdconfig/bsdconfigrc for example.
123 # If $debug is set and non-NULL, prints DEBUG info using printf(1) syntax:
124 # + To $debugFile, if set and non-NULL
125 # + To standard output if $debugFile is either NULL or unset
126 # + To both if $debugFile begins with a single plus-sign (`+')
130 [ "$debug" ] || return $SUCCESS
131 local fmt="$1"; shift
132 case "$debugFile" in ""|+*)
133 printf "DEBUG: $fmt${fmt:+\n}" "$@" >&${TERMINAL_STDOUT_PASSTHRU:-1}
135 [ "${debugFile#+}" ] &&
136 printf "DEBUG: $fmt${fmt:+\n}" "$@" >> "${debugFile#+}"
142 # Initialize debugging. Truncates $debugFile to zero bytes if set.
147 # Process stored command-line arguments
150 local OPTIND OPTARG flag
151 f_dprintf "f_debug_init: ARGV=[%s] GETOPTS_STDARGS=[%s]" \
152 "$ARGV" "$GETOPTS_STDARGS"
153 while getopts "$GETOPTS_STDARGS$GETOPTS_EXTRA$GETOPTS_ALLFLAGS" flag \
157 D) debugFile="$OPTARG" ;;
160 shift $(( $OPTIND - 1 ))
161 f_dprintf "f_debug_init: debug=[%s] debugFile=[%s]" \
162 "$debug" "$debugFile"
165 # Automagically enable debugging if debugFile is set (and non-NULL)
167 [ "$debugFile" ] && { [ "${debug+set}" ] || debug=1; }
170 # Make debugging persistant if set
172 [ "$debug" ] && export debug
173 [ "$debugFile" ] && export debugFile
176 # Truncate debug file unless requested otherwise. Note that we will
177 # trim a leading plus (`+') from the value of debugFile to support
178 # persistant meaning that f_dprintf() should print both to standard
179 # output and $debugFile (minus the leading plus, of course).
181 local _debug_file="${debugFile#+}"
182 if [ "$_debug_file" -a "$DEBUG_INITIALIZE_FILE" ]; then
183 if ( umask 022 && :> "$_debug_file" ); then
184 f_dprintf "Successfully initialized debugFile \`%s'" \
186 f_isset debug || debug=1 # turn debugging on if not set
189 f_dprintf "Unable to initialize debugFile \`%s'" \
195 # f_err $format [$arguments ...]
197 # Print a message to stderr (fd=2).
204 # f_quietly $command [$arguments ...]
206 # Run a command quietly (quell any output to stdout or stderr)
210 "$@" > /dev/null 2>&1
213 # f_have $anything ...
215 # A wrapper to the `type' built-in. Returns true if argument is a valid shell
216 # built-in, keyword, or externally-tracked binary, otherwise false.
223 # setvar $var_to_set [$value]
225 # Implement setvar for shells such as unlike FreeBSD sh(1).
227 if ! f_have setvar; then
230 [ $# -gt 0 ] || return $SUCCESS
231 local __setvar_var_to_set="$1" __setvar_right="$2" __setvar_left=
233 1) unset "$__setvar_var_to_set"
236 *) f_err "setvar: too many arguments\n"
239 while case "$__setvar_r" in *\'*) : ;; *) false ; esac
241 __setvar_left="$__setvar_left${__setvar_right%%\'*}'\\''"
242 __setvar_right="${__setvar_right#*\'}"
244 __setvar_left="$__setvar_left${__setvar_right#*\'}"
245 eval "$__setvar_var_to_set='$__setvar_left'"
249 # f_which $anything [$var_to_set]
251 # A fast built-in replacement for syntaxes such as foo=$( which bar ). In a
252 # comparison of 10,000 runs of this function versus which, this function
253 # completed in under 3 seconds, while `which' took almost a full minute.
255 # If $var_to_set is missing or NULL, output is (like which) to standard out.
256 # Returns success if a match was found, failure otherwise.
260 local __name="$1" __var_to_set="$2"
261 case "$__name" in */*|'') return $FAILURE; esac
262 local __p IFS=":" __found=
264 local __exec="$__p/$__name"
265 [ -f "$__exec" -a -x "$__exec" ] && __found=1 && break
267 if [ "$__found" ]; then
268 if [ "$__var_to_set" ]; then
269 setvar "$__var_to_set" "$__exec"
278 # f_getvar $var_to_get [$var_to_set]
280 # Utility function designed to go along with the already-builtin setvar.
281 # Allows clean variable name indirection without forking or sub-shells.
283 # Returns error status if the requested variable ($var_to_get) is not set.
285 # If $var_to_set is missing or NULL, the value of $var_to_get is printed to
286 # standard output for capturing in a sub-shell (which is less-recommended
287 # because of performance degredation; for example, when called in a loop).
291 local __var_to_get="$1" __var_to_set="$2"
292 [ "$__var_to_set" ] || local value
293 eval [ \"\${$__var_to_get+set}\" ]
295 eval ${__var_to_set:-value}=\"\${$__var_to_get}\"
296 eval f_dprintf '"f_getvar: var=[%s] value=[%s] r=%u"' \
297 \"\$__var_to_get\" \"\$${__var_to_set:-value}\" \$__retval
298 [ "$__var_to_set" ] || { [ "$value" ] && echo "$value"; }
304 # Check if variable $var is set. Returns success if variable is set, otherwise
309 eval [ \"\${${1%%[$IFS]*}+set}\" ]
312 # f_die [$status [$format [$arguments ...]]]
314 # Abruptly terminate due to an error optionally displaying a message in a
315 # dialog box using printf(1) syntax.
319 local status=$FAILURE
321 # If there is at least one argument, take it as the status
322 if [ $# -gt 0 ]; then
327 # If there are still arguments left, pass them to f_show_msg
328 [ $# -gt 0 ] && f_show_msg "$@"
330 # Optionally call f_clean_up() function if it exists
331 f_have f_clean_up && f_clean_up
342 exec 2>&1 # fix sh(1) bug where stderr gets lost within async-trap
346 # f_show_info $format [$arguments ...]
348 # Display a message in a dialog infobox using printf(1) syntax.
356 # Use f_dialog_infobox from dialog.subr if possible, otherwise fall
357 # back to dialog(1) (without options, making it obvious when using
358 # un-aided system dialog).
360 if f_have f_dialog_info; then
363 dialog --infobox "$msg" 0 0
367 # f_show_msg $format [$arguments ...]
369 # Display a message in a dialog box using printf(1) syntax.
377 # Use f_dialog_msgbox from dialog.subr if possible, otherwise fall
378 # back to dialog(1) (without options, making it obvious when using
379 # un-aided system dialog).
381 if f_have f_dialog_msgbox; then
382 f_dialog_msgbox "$msg"
384 dialog --msgbox "$msg" 0 0
388 # f_show_err $format [$arguments ...]
390 # Display a message in a dialog box with ``Error'' i18n title (overridden by
391 # setting msg_error) using printf(1) syntax.
398 : ${msg:=${msg_an_unknown_error_occurred:-An unknown error occurred}}
400 if [ "$_DIALOG_SUBR" ]; then
401 f_dialog_title "${msg_error:-Error}"
402 f_dialog_msgbox "$msg"
403 f_dialog_title_restore
405 dialog --title "${msg_error:-Error}" --msgbox "$msg" 0 0
410 # f_yesno $format [$arguments ...]
412 # Display a message in a dialog yes/no box using printf(1) syntax.
420 # Use f_dialog_yesno from dialog.subr if possible, otherwise fall
421 # back to dialog(1) (without options, making it obvious when using
422 # un-aided system dialog).
424 if f_have f_dialog_yesno; then
425 f_dialog_yesno "$msg"
427 dialog --yesno "$msg" 0 0
431 # f_noyes $format [$arguments ...]
433 # Display a message in a dialog yes/no box using printf(1) syntax.
434 # NOTE: THis is just like the f_yesno function except "No" is default.
442 # Use f_dialog_noyes from dialog.subr if possible, otherwise fall
443 # back to dialog(1) (without options, making it obvious when using
444 # un-aided system dialog).
446 if f_have f_dialog_noyes; then
447 f_dialog_noyes "$msg"
449 dialog --defaultno --yesno "$msg" 0 0
455 # Display a language help-file. Automatically takes $LANG and $LC_ALL into
456 # consideration when displaying $file (suffix ".$LC_ALL" or ".$LANG" will
457 # automatically be added prior to loading the language help-file).
459 # If a language has been requested by setting either $LANG or $LC_ALL in the
460 # environment and the language-specific help-file does not exist we will fall
461 # back to $file without-suffix.
463 # If the language help-file does not exist, an error is displayed instead.
468 local lang="${LANG:-$LC_ALL}"
470 [ -f "$file.$lang" ] && file="$file.$lang"
473 # Use f_dialog_textbox from dialog.subr if possible, otherwise fall
474 # back to dialog(1) (without options, making it obvious when using
475 # un-aided system dialog).
477 if f_have f_dialog_textbox; then
478 f_dialog_textbox "$file"
480 dialog --msgbox "$( cat "$file" 2>&1 )" 0 0
486 # Include a shell subroutine file.
488 # If the subroutine file exists but returns error status during loading, exit
489 # is called and execution is prematurely terminated with the same error status.
494 f_dprintf "f_include: file=[%s]" "$file"
498 # f_include_lang $file
500 # Include a language file. Automatically takes $LANG and $LC_ALL into
501 # consideration when including $file (suffix ".$LC_ALL" or ".$LANG" will
502 # automatically by added prior to loading the language file).
504 # No error is produced if (a) a language has been requested (by setting either
505 # $LANG or $LC_ALL in the environment) and (b) the language file does not
506 # exist -- in which case we will fall back to loading $file without-suffix.
508 # If the language file exists but returns error status during loading, exit
509 # is called and execution is prematurely terminated with the same error status.
514 local lang="${LANG:-$LC_ALL}"
516 f_dprintf "f_include_lang: file=[%s] lang=[%s]" "$file" "$lang"
517 if [ -f "$file.$lang" ]; then
518 . "$file.$lang" || exit $?
524 # f_usage $file [$key1 $value1 ...]
526 # Display USAGE file with optional pre-processor macro definitions. The first
527 # argument is the template file containing the usage text to be displayed. If
528 # $LANG or $LC_ALL (in order of preference, respectively) is set, ".encoding"
529 # will automatically be appended as a suffix to the provided $file pathname.
531 # When processing $file, output begins at the first line containing that is
532 # (a) not a comment, (b) not empty, and (c) is not pure-whitespace. All lines
533 # appearing after this first-line are output, including (a) comments (b) empty
534 # lines, and (c) lines that are purely whitespace-only.
536 # If additional arguments appear after $file, substitutions are made while
537 # printing the contents of the USAGE file. The pre-processor macro syntax is in
538 # the style of autoconf(1), for example:
540 # f_usage $file "FOO" "BAR"
542 # Will cause instances of "@FOO@" appearing in $file to be replaced with the
543 # text "BAR" before being printed to the screen.
545 # This function is a two-parter. Below is the awk(1) portion of the function,
546 # afterward is the sh(1) function which utilizes the below awk script.
551 if ( !found && $0 ~ /^[[:space:]]*($|#)/ ) next
559 local lang="${LANG:-$LC_ALL}"
561 f_dprintf "f_usage: file=[%s] lang=[%s]" "$file" "$lang"
566 if [ -f "$file.$lang" ]; then
567 usage=$( awk "$f_usage_awk" "$file.$lang" ) || exit $FAILURE
569 usage=$( awk "$f_usage_awk" "$file" ) || exit $FAILURE
572 while [ $# -gt 0 ]; do
575 usage=$( echo "$usage" | awk \
576 "{ gsub(/@$key@/, ENVIRON[\"value\"]); print }" )
580 f_err "%s\n" "$usage"
585 # f_index_file $keyword [$var_to_set]
587 # Process all INDEX files known to bsdconfig and return the path to first file
588 # containing a menu_selection line with a keyword portion matching $keyword.
590 # If $LANG or $LC_ALL (in order of preference, respectively) is set,
591 # "INDEX.encoding" files will be searched first.
593 # If no file is found, error status is returned along with the NULL string.
595 # If $var_to_set is NULL or missing, output is printed to stdout (which is less
596 # recommended due to performance degradation; in a loop for example).
598 # This function is a two-parter. Below is the awk(1) portion of the function,
599 # afterward is the sh(1) function which utilizes the below awk script.
602 # Variables that should be defined on the invocation line:
603 # -v keyword="keyword"
605 ( $0 ~ "^menu_selection=\"" keyword "\\|" ) {
614 local __keyword="$1" __var_to_set="$2"
615 local __lang="${LANG:-$LC_ALL}"
616 local __indexes="$BSDCFG_LIBE${BSDCFG_LIBE:+/}*/INDEX"
618 f_dprintf "f_index_file: keyword=[%s] lang=[%s]" "$__keyword" "$__lang"
620 if [ "$__lang" ]; then
621 if [ "$__var_to_set" ]; then
622 eval "$__var_to_set"='"$( awk -v keyword="$__keyword" \
623 "$f_index_file_awk" $__indexes.$__lang
624 )"' && return $SUCCESS
626 awk -v keyword="$__keyword" "$f_index_file_awk" \
627 $__indexes.$__lang && return $SUCCESS
629 # No match, fall-thru to non-i18n sources
631 if [ "$__var_to_set" ]; then
632 eval "$__var_to_set"='"$( awk -v keyword="$__keyword" \
633 "$f_index_file_awk" $__indexes )"' && return $SUCCESS
635 awk -v keyword="$__keyword" "$f_index_file_awk" $__indexes &&
639 # No match? Fall-thru to `local' libexec sources (add-on modules)
641 [ "$BSDCFG_LOCAL_LIBE" ] || return $FAILURE
642 __indexes="$BSDCFG_LOCAL_LIBE/*/INDEX"
643 if [ "$__lang" ]; then
644 if [ "$__var_to_set" ]; then
645 eval "$__var_to_set"='"$( awk -v keyword="$__keyword" \
646 "$f_index_file_awk" $__indexes.$__lang
647 )"' && return $SUCCESS
649 awk -v keyword="$__keyword" "$f_index_file_awk" \
650 $__indexes.$__lang && return $SUCCESS
652 # No match, fall-thru to non-i18n sources
654 if [ "$__var_to_set" ]; then
655 eval "$__var_to_set"='$( awk -v keyword="$__keyword" \
656 "$f_index_file_awk" $__indexes )"'
658 awk -v keyword="$__keyword" "$f_index_file_awk" $__indexes
662 # f_index_menusel_keyword $indexfile $pgm [$var_to_set]
664 # Process $indexfile and return only the keyword portion of the menu_selection
665 # line with a command portion matching $pgm.
667 # This function is for internationalization (i18n) mapping of the on-disk
668 # scriptname ($pgm) into the localized language (given language-specific
669 # $indexfile). If $LANG or $LC_ALL (in orderder of preference, respectively) is
670 # set, ".encoding" will automatically be appended as a suffix to the provided
671 # $indexfile pathname.
673 # If, within $indexfile, multiple $menu_selection values map to $pgm, only the
674 # first one will be returned. If no mapping can be made, the NULL string is
677 # If $indexfile does not exist, error status is returned with NULL.
679 # If $var_to_set is NULL or missing, output is printed to stdout (which is less
680 # recommended due to performance degradation; in a loop for example).
682 # This function is a two-parter. Below is the awk(1) portion of the function,
683 # afterward is the sh(1) function which utilizes the below awk script.
685 f_index_menusel_keyword_awk='
686 # Variables that should be defined on the invocation line:
687 # -v pgm="program_name"
690 prefix = "menu_selection=\""
691 plen = length(prefix)
695 if (!match($0, "^" prefix ".*\\|.*\"")) next
697 keyword = command = substr($0, plen + 1, RLENGTH - plen - 1)
698 sub(/^.*\|/, "", command)
699 sub(/\|.*$/, "", keyword)
701 if ( command == pgm )
710 f_index_menusel_keyword()
712 local __indexfile="$1" __pgm="$2" __var_to_set="$3"
713 local __lang="${LANG:-$LC_ALL}" __file="$__indexfile"
715 [ -f "$__indexfile.$__lang" ] && __file="$__indexfile.$__lang"
716 f_dprintf "f_index_menusel_keyword: index=[%s] pgm=[%s] lang=[%s]" \
717 "$__file" "$__pgm" "$__lang"
719 if [ "$__var_to_set" ]; then
720 setvar "$__var_to_set" "$( awk \
721 -v pgm="$__pgm" "$f_index_menusel_keyword_awk" "$__file"
724 awk -v pgm="$__pgm" "$f_index_menusel_keyword_awk" "$__file"
728 # f_index_menusel_command $indexfile $keyword [$var_to_set]
730 # Process $indexfile and return only the command portion of the menu_selection
731 # line with a keyword portion matching $keyword.
733 # This function is for mapping [possibly international] keywords into the
734 # command to be executed. If $LANG or $LC_ALL (order of preference) is set,
735 # ".encoding" will automatically be appended as a suffix to the provided
736 # $indexfile pathname.
738 # If, within $indexfile, multiple $menu_selection values map to $keyword, only
739 # the first one will be returned. If no mapping can be made, the NULL string is
742 # If $indexfile doesn't exist, error status is returned with NULL.
744 # If $var_to_set is NULL or missing, output is printed to stdout (which is less
745 # recommended due to performance degradation; in a loop for example).
747 # This function is a two-parter. Below is the awk(1) portion of the function,
748 # afterward is the sh(1) function which utilizes the below awk script.
750 f_index_menusel_command_awk='
751 # Variables that should be defined on the invocation line:
755 prefix = "menu_selection=\""
756 plen = length(prefix)
760 if (!match($0, "^" prefix ".*\\|.*\"")) next
762 keyword = command = substr($0, plen + 1, RLENGTH - plen - 1)
763 sub(/^.*\|/, "", command)
764 sub(/\|.*$/, "", keyword)
766 if ( keyword == key )
775 f_index_menusel_command()
777 local __indexfile="$1" __keyword="$2" __var_to_set="$3" __command
778 local __lang="${LANG:-$LC_ALL}" __file="$__indexfile"
780 [ -f "$__indexfile.$__lang" ] && __file="$__indexfile.$__lang"
781 f_dprintf "f_index_menusel_command: index=[%s] key=[%s] lang=[%s]" \
782 "$__file" "$__keyword" "$__lang"
784 [ -f "$__file" ] || return $FAILURE
785 __command=$( awk -v key="$__keyword" \
786 "$f_index_menusel_command_awk" "$__file" ) || return $FAILURE
789 # If the command pathname is not fully qualified fix-up/force to be
790 # relative to the $indexfile directory.
793 /*) : already fully qualified ;;
795 local __indexdir="${__indexfile%/*}"
796 [ "$__indexdir" != "$__indexfile" ] || __indexdir="."
797 __command="$__indexdir/$__command"
800 if [ "$__var_to_set" ]; then
801 setvar "$__var_to_set" "$__command"
809 # Returns true if running as init(1).
814 # When a custom init(8) performs an exec(3) to invoke a shell script,
815 # PID 1 becomes sh(1) and $PPID is set to 1 in the executed script.
817 [ ${PPID:-0} -eq 1 ] # Return status
820 # f_mounted $local_directory
821 # f_mounted -b $device
823 # Return success if a filesystem is mounted on a particular directory. If `-b'
824 # is present, instead check that the block device (or a partition thereof) is
829 local OPTIND OPTARG flag use_device=
830 while getopts b flag; do
835 shift $(( $OPTIND - 1 ))
836 if [ "$use_device" ]; then
839 "^$device([[:space:]]|p[0-9]|s[0-9]|\.nop|\.eli)"
841 [ -d "$dir" ] || return $FAILURE
842 mount | grep -Eq " on $dir \([^)]+\)$"
844 # Return status is that of last grep(1)
847 # f_eval_catch [-de] [-k $var_to_set] $funcname $utility \
848 # $format [$arguments ...]
850 # Silently evaluate a command in a sub-shell and test for error. If debugging
851 # is enabled a copy of the command and its output is sent to debug (either
852 # stdout or file depending on environment). If an error occurs, output of the
853 # command is displayed in a dialog(1) msgbox using the [above] f_show_err()
854 # function (unless optional `-d' flag is given, then no dialog).
856 # The $funcname argument is sent to debugging while the $utility argument is
857 # used in the title of the dialog box. The command that is executed as well as
858 # sent to debugging with $funcname is the product of the printf(1) syntax
859 # produced by $format with optional $arguments.
861 # The following options are supported:
863 # -d Do not use dialog(1).
864 # -e Produce error text from failed command on stderr.
865 # -k var Save output from the command in var.
870 # f_eval_catch myfunc echo 'echo "%s"' "Hello, World!"
872 # Produces the following debug output:
874 # DEBUG: myfunc: echo "Hello, World!"
875 # DEBUG: myfunc: retval=0 <output below>
881 # f_eval_catch -k contents myfunc cat 'cat "%s"' /some/file
882 # # dialog(1) Error ``cat: /some/file: No such file or directory''
883 # # contents=[cat: /some/file: No such file or directory]
885 # Produces the following debug output:
887 # DEBUG: myfunc: cat "/some/file"
888 # DEBUG: myfunc: retval=1 <output below>
889 # cat: /some/file: No such file or directory
894 # echo 123 | f_eval_catch myfunc rev rev
896 # Produces the following debug output:
899 # DEBUG: myfunc: retval=0 <output below>
905 # f_eval_catch myfunc true true
907 # Produces the following debug output:
909 # DEBUG: myfunc: true
910 # DEBUG: myfunc: retval=0 <no output>
914 # f_eval_catch -de myfunc ls 'ls "%s"' /some/dir
915 # # Output on stderr ``ls: /some/dir: No such file or directory''
919 # f_eval_catch -dek contents myfunc ls 'ls "%s"' /etc
920 # # Output from `ls' sent to stderr and also saved in $contents
924 local __no_dialog= __show_err= __var_to_set=
927 # Process local function arguments
929 local OPTIND OPTARG __flag
930 while getopts "dek:" __flag > /dev/null; do
934 k) __var_to_set="$OPTARG" ;;
937 shift $(( $OPTIND - 1 ))
939 local __funcname="$1" __utility="$2"; shift 2
940 local __cmd __output __retval
942 __cmd=$( printf -- "$@" )
943 f_dprintf "%s: %s" "$__funcname" "$__cmd" # Log command *before* eval
944 __output=$( exec 2>&1; eval "$__cmd" )
946 if [ "$__output" ]; then
947 [ "$__show_err" ] && echo "$__output" >&2
948 f_dprintf "%s: retval=%i <output below>\n%s" "$__funcname" \
949 $__retval "$__output"
951 f_dprintf "%s: retval=%i <no output>" "$__funcname" $__retval
954 ! [ "$__no_dialog" -o "$nonInteractive" -o $__retval -eq $SUCCESS ] &&
955 msg_error="${msg_error:-Error}${__utility:+: $__utility}" \
956 f_show_err "%s" "$__output"
957 # NB: f_show_err will handle NULL output appropriately
959 [ "$__var_to_set" ] && setvar "$__var_to_set" "$__output"
964 # f_count $var_to_set arguments ...
966 # Sets $var_to_set to the number of arguments minus one (the effective number
967 # of arguments following $var_to_set).
970 # f_count count dog house # count=[2]
974 setvar "$1" $(( $# - 1 ))
977 # f_count_ifs $var_to_set string ...
979 # Sets $var_to_set to the number of words (split by the internal field
980 # separator, IFS) following $var_to_set.
984 # string="word1 word2 word3"
985 # f_count_ifs count "$string" # count=[3]
986 # f_count_ifs count $string # count=[3]
990 # IFS=. f_count_ifs count www.freebsd.org # count=[3]
992 # NB: Make sure to use double-quotes if you are using a custom value for IFS
993 # and you don't want the current value to effect the result. See example 3.
998 # IFS=- f_count_ifs count "$string" # count=[3]
999 # IFS=- f_count_ifs count $string # count=[4]
1003 local __var_to_set="$1"
1006 setvar "$__var_to_set" $#
1009 ############################################################ MAIN
1012 # Trap signals so we can recover gracefully
1014 trap 'f_interrupt' SIGINT
1015 trap 'f_die' SIGTERM SIGPIPE SIGXCPU SIGXFSZ \
1016 SIGFPE SIGTRAP SIGABRT SIGSEGV
1017 trap '' SIGALRM SIGPROF SIGUSR1 SIGUSR2 SIGHUP SIGVTALRM
1020 # Clone terminal stdout/stderr so we can redirect to it from within sub-shells
1022 eval exec $TERMINAL_STDOUT_PASSTHRU\>\&1
1023 eval exec $TERMINAL_STDERR_PASSTHRU\>\&2
1026 # Self-initialize unless requested otherwise
1028 f_dprintf "%s: DEBUG_SELF_INITIALIZE=[%s]" \
1029 dialog.subr "$DEBUG_SELF_INITIALIZE"
1030 case "$DEBUG_SELF_INITIALIZE" in
1031 ""|0|[Nn][Oo]|[Oo][Ff][Ff]|[Ff][Aa][Ll][Ss][Ee]) : do nothing ;;
1036 # Log our operating environment for debugging purposes
1038 f_dprintf "UNAME_S=[%s] UNAME_P=[%s] UNAME_R=[%s]" \
1039 "$UNAME_S" "$UNAME_P" "$UNAME_R"
1041 f_dprintf "%s: Successfully loaded." common.subr
1043 fi # ! $_COMMON_SUBR