freebsd-skq/usr.sbin/bsdconfig/share/common.subr
dteske 6089bf07c7 Add new flags -d' (sets debug=1) and -D file' (sets debugFile) and
improve debugging initialization. Also fixup USAGE statements while we're
here. Also, change initialization of main program to _not_ change working
directory, allowing the debugFile to be relative without confusion.
2013-04-22 05:02:34 +00:00

694 lines
18 KiB
Plaintext

if [ ! "$_COMMON_SUBR" ]; then _COMMON_SUBR=1
#
# Copyright (c) 2012 Ron McDowell
# Copyright (c) 2012-2013 Devin Teske
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
############################################################ CONFIGURATION
#
# Default file descriptors to link to stdout/stderr for passthru allowing
# redirection within a sub-shell to bypass directly to the terminal.
#
: ${TERMINAL_STDOUT_PASSTHRU:=3}}
: ${TERMINAL_STDERR_PASSTHRU:=4}}
############################################################ GLOBALS
#
# Program name
#
pgm="${0##*/}"
#
# Program arguments
#
ARGC="$#"
ARGV="$@"
#
# Global exit status variables
#
SUCCESS=0
FAILURE=1
#
# Operating environment details
#
export UNAME_S="$(uname -s)" # Operating System (i.e. FreeBSD)
export UNAME_P="$(uname -p)" # Processor Architecture (i.e. i386)
export UNAME_R="$(uname -r)" # Release Level (i.e. X.Y-RELEASE)
#
# Default behavior is to call f_debug_init() automatically when loaded.
#
: ${DEBUG_SELF_INITIALIZE=1}
############################################################ FUNCTIONS
# f_dprintf $fmt [ $opts ... ]
#
# Sensible debug function. Override in ~/.bsdconfigrc if desired.
# See /usr/share/examples/bsdconfig/bsdconfigrc for example.
#
# If $debug is set and non-NULL, prints DEBUG info using printf(1) syntax:
# + To $debugFile, if set and non-NULL
# + To standard output if $debugFile is either NULL or unset
# + To both if $debugFile begins with a single plus-sign (`+')
#
f_dprintf()
{
[ "$debug" ] || return $SUCCESS
local fmt="$1"; shift
case "$debugFile" in ""|+*)
printf "DEBUG: $fmt${fmt:+\n}" "$@" >&${TERMINAL_STDOUT_PASSTHRU:-1}
esac
[ "${debugFile#+}" ] &&
printf "DEBUG: $fmt${fmt:+\n}" "$@" >> "${debugFile#+}"
return $SUCCESS
}
# f_debug_init
#
# Initialize debugging. Truncates $debugFile to zero bytes if set.
#
f_debug_init()
{
#
# Process stored command-line arguments
#
( set -- "$ARGV"
while getopts d flag > /dev/null; do
case "$flag" in
d) true; exit;;
\?) continue;;
esac
done
false
) && debug=1
debugFile=$( set -- "$ARGV"
while getopts D flag > /dev/null; do
case "$flag" in
D) echo "$OPTARG";;
\?) continue;;
esac
done
)
#
# Make debugging persistant if set
#
[ "$debug" ] && export debug
#
# Truncate the debug file upon. Note that we will trim a leading plus
# (`+') from the value of debugFile to support persistant meaning that
# f_dprintf() should print both to standard output and $debugFile
# (minus the leading plus, of course).
#
local _debug_file="${debugFile#+}"
if [ "$_debug_file" ]; then
if ( umask 022 && :> "$_debug_file" ); then
f_dprintf "Successfully initialized debugFile \`%s'" \
"$_debug_file"
[ "${debug+set}" ] ||
debug=1 # turn debugging on if not set
else
unset debugFile
f_dprintf "Unable to initialize debugFile \`%s'" \
"$_debug_file"
fi
fi
}
# f_err $fmt [ $opts ... ]
#
# Print a message to stderr (fd=2).
#
f_err()
{
printf "$@" >&${TERMINAL_STDERR_PASSTHRU:-2}
}
# f_quietly $command [ $arguments ... ]
#
# Run a command quietly (quell any output to stdout or stderr)
#
f_quietly()
{
"$@" > /dev/null 2>&1
}
# f_have $anything ...
#
# A wrapper to the `type' built-in. Returns true if argument is a valid shell
# built-in, keyword, or externally-tracked binary, otherwise false.
#
f_have()
{
f_quietly type "$@"
}
# f_getvar $var_to_get [$var_to_set]
#
# Utility function designed to go along with the already-builtin setvar.
# Allows clean variable name indirection without forking or sub-shells.
#
# Returns error status if the requested variable ($var_to_get) is not set.
#
# If $var_to_set is missing or NULL, the value of $var_to_get is printed to
# standard output for capturing in a sub-shell (which is less-recommended
# because of performance degredation; for example, when called in a loop).
#
f_getvar()
{
local __var_to_get="$1" __var_to_set="$2"
[ "$__var_to_set" ] || local value
eval ${__var_to_set:-value}=\"\${$__var_to_get}\"
eval [ \"\${$__var_to_get+set}\" ]
local __retval=$?
eval f_dprintf '"f_getvar: var=[%s] value=[%s] r=%u"' \
\"\$__var_to_get\" \"\$${__var_to_set:-value}\" \$__retval
[ "$__var_to_set" ] || { [ "$value" ] && echo "$value"; }
return $__retval
}
# f_die [ $status [ $fmt [ $opts ... ]]]
#
# Abruptly terminate due to an error optionally displaying a message in a
# dialog box using printf(1) syntax.
#
f_die()
{
local status=$FAILURE
# If there is at least one argument, take it as the status
if [ $# -gt 0 ]; then
status=$1
shift 1 # status
fi
# If there are still arguments left, pass them to f_show_msg
[ $# -gt 0 ] && f_show_msg "$@"
# Optionally call f_clean_up() function if it exists
f_have f_clean_up && f_clean_up
exit $status
}
# f_interrupt
#
# Interrupt handler.
#
f_interrupt()
{
exec 2>&1 # fix sh(1) bug where stderr gets lost within async-trap
f_die
}
# f_show_info $fmt [ $opts ... ]
#
# Display a message in a dialog infobox using printf(1) syntax.
#
f_show_info()
{
local msg
msg=$( printf "$@" )
#
# Use f_dialog_infobox from dialog.subr if possible, otherwise fall
# back to dialog(1) (without options, making it obvious when using
# un-aided system dialog).
#
if f_have f_dialog_info; then
f_dialog_info "$msg"
else
dialog --infobox "$msg" 0 0
fi
}
# f_show_msg $fmt [ $opts ... ]
#
# Display a message in a dialog box using printf(1) syntax.
#
f_show_msg()
{
local msg
msg=$( printf "$@" )
#
# Use f_dialog_msgbox from dialog.subr if possible, otherwise fall
# back to dialog(1) (without options, making it obvious when using
# un-aided system dialog).
#
if f_have f_dialog_msgbox; then
f_dialog_msgbox "$msg"
else
dialog --msgbox "$msg" 0 0
fi
}
# f_yesno $fmt [ $opts ... ]
#
# Display a message in a dialog yes/no box using printf(1) syntax.
#
f_yesno()
{
local msg
msg=$( printf "$@" )
#
# Use f_dialog_yesno from dialog.subr if possible, otherwise fall
# back to dialog(1) (without options, making it obvious when using
# un-aided system dialog).
#
if f_have f_dialog_yesno; then
f_dialog_yesno "$msg"
else
dialog --yesno "$msg" 0 0
fi
}
# f_noyes $fmt [ $opts ... ]
#
# Display a message in a dialog yes/no box using printf(1) syntax.
# NOTE: THis is just like the f_yesno function except "No" is default.
#
f_noyes()
{
local msg
msg=$( printf "$@" )
#
# Use f_dialog_noyes from dialog.subr if possible, otherwise fall
# back to dialog(1) (without options, making it obvious when using
# un-aided system dialog).
#
if f_have f_dialog_noyes; then
f_dialog_noyes "$msg"
else
dialog --defaultno --yesno "$msg" 0 0
fi
}
# f_show_help $file
#
# Display a language help-file. Automatically takes $LANG and $LC_ALL into
# consideration when displaying $file (suffix ".$LC_ALL" or ".$LANG" will
# automatically be added prior to loading the language help-file).
#
# If a language has been requested by setting either $LANG or $LC_ALL in the
# environment and the language-specific help-file does not exist we will fall
# back to $file without-suffix.
#
# If the language help-file does not exist, an error is displayed instead.
#
f_show_help()
{
local file="$1"
local lang="${LANG:-$LC_ALL}"
[ -f "$file.$lang" ] && file="$file.$lang"
#
# Use f_dialog_textbox from dialog.subr if possible, otherwise fall
# back to dialog(1) (without options, making it obvious when using
# un-aided system dialog).
#
if f_have f_dialog_textbox; then
f_dialog_textbox "$file"
else
dialog --msgbox "$( cat "$file" 2>&1 )" 0 0
fi
}
# f_include $file
#
# Include a shell subroutine file.
#
# If the subroutine file exists but returns error status during loading, exit
# is called and execution is prematurely terminated with the same error status.
#
f_include()
{
local file="$1"
f_dprintf "f_include: file=[%s]" "$file"
. "$file" || exit $?
}
# f_include_lang $file
#
# Include a language file. Automatically takes $LANG and $LC_ALL into
# consideration when including $file (suffix ".$LC_ALL" or ".$LANG" will
# automatically by added prior to loading the language file).
#
# No error is produced if (a) a language has been requested (by setting either
# $LANG or $LC_ALL in the environment) and (b) the language file does not
# exist -- in which case we will fall back to loading $file without-suffix.
#
# If the language file exists but returns error status during loading, exit
# is called and execution is prematurely terminated with the same error status.
#
f_include_lang()
{
local file="$1"
local lang="${LANG:-$LC_ALL}"
f_dprintf "f_include_lang: file=[%s] lang=[%s]" "$file" "$lang"
if [ -f "$file.$lang" ]; then
. "$file.$lang" || exit $?
else
. "$file" || exit $?
fi
}
# f_usage $file [ $key1 $value1 ... ]
#
# Display USAGE file with optional pre-processor macro definitions. The first
# argument is the template file containing the usage text to be displayed. If
# $LANG or $LC_ALL (in order of preference, respectively) is set, ".encoding"
# will automatically be appended as a suffix to the provided $file pathname.
#
# When processing $file, output begins at the first line containing that is
# (a) not a comment, (b) not empty, and (c) is not pure-whitespace. All lines
# appearing after this first-line are output, including (a) comments (b) empty
# lines, and (c) lines that are purely whitespace-only.
#
# If additional arguments appear after $file, substitutions are made while
# printing the contents of the USAGE file. The pre-processor macro syntax is in
# the style of autoconf(1), for example:
#
# f_usage $file "FOO" "BAR"
#
# Will cause instances of "@FOO@" appearing in $file to be replaced with the
# text "BAR" before bering printed to the screen.
#
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_usage_awk='
BEGIN { found = 0 }
{
if ( !found && $0 ~ /^[[:space:]]*($|#)/ ) next
found = 1
print
}
'
f_usage()
{
local file="$1"
local lang="${LANG:-$LC_ALL}"
f_dprintf "f_usage: file=[%s] lang=[%s]" "$file" "$lang"
shift 1 # file
local usage
if [ -f "$file.$lang" ]; then
usage=$( awk "$f_usage_awk" "$file.$lang" ) || exit $FAILURE
else
usage=$( awk "$f_usage_awk" "$file" ) || exit $FAILURE
fi
while [ $# -gt 0 ]; do
local key="$1"
export value="$2"
usage=$( echo "$usage" | awk \
"{ gsub(/@$key@/, ENVIRON[\"value\"]); print }" )
shift 2
done
f_err "%s\n" "$usage"
exit $FAILURE
}
# f_index_file $keyword
#
# Process all INDEX files known to bsdconfig and return the path to first file
# containing a menu_selection line with a keyword portion matching $keyword.
#
# If $LANG or $LC_ALL (in order of preference, respectively) is set,
# "INDEX.encoding" files will be searched first.
#
# If no file is found, error status is returned along with the NULL string.
#
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_index_file_awk='
# Variables that should be defined on the invocation line:
# -v keyword="keyword"
BEGIN { found = 0 }
( $0 ~ "^menu_selection=\"" keyword "\\|" ) {
print FILENAME
found++
exit
}
END { exit ! found }
'
f_index_file()
{
local keyword="$1"
local lang="${LANG:-$LC_ALL}"
f_dprintf "f_index_file: keyword=[%s] lang=[%s]" "$keyword" "$lang"
if [ "$lang" ]; then
awk -v keyword="$keyword" "$f_index_file_awk" \
$BSDCFG_LIBE${BSDCFG_LIBE:+/}*/INDEX.$lang &&
return
# No match, fall-thru to non-i18n sources
fi
awk -v keyword="$keyword" "$f_index_file_awk" \
$BSDCFG_LIBE${BSDCFG_LIBE:+/}*/INDEX
}
# f_index_menusel_keyword $indexfile $pgm
#
# Process $indexfile and return only the keyword portion of the menu_selection
# line with a command portion matching $pgm.
#
# This function is for internationalization (i18n) mapping of the on-disk
# scriptname ($pgm) into the localized language (given language-specific
# $indexfile). If $LANG or $LC_ALL (in orderder of preference, respectively) is
# set, ".encoding" will automatically be appended as a suffix to the provided
# $indexfile pathname.
#
# If, within $indexfile, multiple $menu_selection values map to $pgm, only the
# first one will be returned. If no mapping can be made, the NULL string is
# returned.
#
# If $indexfile does not exist, error status is returned with NULL.
#
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_index_menusel_keyword_awk='
# Variables that should be defined on the invocation line:
# -v pgm="program_name"
#
BEGIN {
prefix = "menu_selection=\""
plen = length(prefix)
found = 0
}
{
if (!match($0, "^" prefix ".*\\|.*\"")) next
keyword = command = substr($0, plen + 1, RLENGTH - plen - 1)
sub(/^.*\|/, "", command)
sub(/\|.*$/, "", keyword)
if ( command == pgm )
{
print keyword
found++
exit
}
}
END { exit ! found }
'
f_index_menusel_keyword()
{
local indexfile="$1" pgm="$2"
local lang="${LANG:-$LC_ALL}"
f_dprintf "f_index_menusel_keyword: index=[%s] pgm=[%s] lang=[%s]" \
"$indexfile" "$pgm" "$lang"
if [ -f "$indexfile.$lang" ]; then
awk -v pgm="$pgm" \
"$f_index_menusel_keyword_awk" \
"$indexfile.$lang"
elif [ -f "$indexfile" ]; then
awk -v pgm="$pgm" \
"$f_index_menusel_keyword_awk" \
"$indexfile"
fi
}
# f_index_menusel_command $indexfile $keyword
#
# Process $indexfile and return only the command portion of the menu_selection
# line with a keyword portion matching $keyword.
#
# This function is for mapping [possibly international] keywords into the
# command to be executed. If $LANG or $LC_ALL (order of preference) is set,
# ".encoding" will automatically be appended as a suffix to the provided
# $indexfile pathname.
#
# If, within $indexfile, multiple $menu_selection values map to $keyword, only
# the first one will be returned. If no mapping can be made, the NULL string is
# returned.
#
# If $indexfile doesn't exist, error status is returned with NULL.
#
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_index_menusel_command_awk='
# Variables that should be defined on the invocation line:
# -v key="keyword"
#
BEGIN {
prefix = "menu_selection=\""
plen = length(prefix)
found = 0
}
{
if (!match($0, "^" prefix ".*\\|.*\"")) next
keyword = command = substr($0, plen + 1, RLENGTH - plen - 1)
sub(/^.*\|/, "", command)
sub(/\|.*$/, "", keyword)
if ( keyword == key )
{
print command
found++
exit
}
}
END { exit ! found }
'
f_index_menusel_command()
{
local indexfile="$1" keyword="$2" command
local lang="${LANG:-$LC_ALL}"
f_dprintf "f_index_menusel_command: index=[%s] key=[%s] lang=[%s]" \
"$indexfile" "$keyword" "$lang"
if [ -f "$indexfile.$lang" ]; then
command=$( awk -v key="$keyword" \
"$f_index_menusel_command_awk" \
"$indexfile.$lang" ) || return $FAILURE
elif [ -f "$indexfile" ]; then
command=$( awk -v key="$keyword" \
"$f_index_menusel_command_awk" \
"$indexfile" ) || return $FAILURE
else
return $FAILURE
fi
#
# If the command pathname is not fully qualified fix-up/force to be
# relative to the $indexfile directory.
#
case "$command" in
/*) : already fully qualified ;;
*)
local indexdir="${indexfile%/*}"
[ "$indexdir" != "$indexfile" ] || indexdir="."
command="$indexdir/$command"
esac
echo "$command"
}
# f_running_as_init
#
# Returns true if running as init(1).
#
f_running_as_init()
{
#
# When a custom init(8) performs an exec(3) to invoke a shell script,
# PID 1 becomes sh(1) and $PPID is set to 1 in the executed script.
#
[ ${PPID:-0} -eq 1 ] # Return status
}
# f_mounted $local_directory
#
# Return success if a filesystem is mounted on a particular directory.
#
f_mounted()
{
local dir="$1"
[ -d "$dir" ] || return $FAILURE
mount | grep -Eq " on $dir \([^)]+\)$"
}
############################################################ MAIN
#
# Trap signals so we can recover gracefully
#
trap 'f_interrupt' SIGINT
trap 'f_die' SIGTERM SIGPIPE SIGXCPU SIGXFSZ \
SIGFPE SIGTRAP SIGABRT SIGSEGV
trap '' SIGALRM SIGPROF SIGUSR1 SIGUSR2 SIGHUP SIGVTALRM
#
# Clone terminal stdout/stderr so we can redirect to it from within sub-shells
#
eval exec $TERMINAL_STDOUT_PASSTHRU\>\&1
eval exec $TERMINAL_STDERR_PASSTHRU\>\&2
#
# Self-initialize unless requested otherwise
#
f_dprintf "%s: DEBUG_SELF_INITIALIZE=[%s]" \
dialog.subr "$DEBUG_SELF_INITIALIZE"
case "$DEBUG_SELF_INITIALIZE" in
""|0|[Nn][Oo]|[Oo][Ff][Ff]|[Ff][Aa][Ll][Ss][Ee]) : do nothing ;;
*) f_debug_init
esac
#
# Log our operating environment for debugging purposes
#
f_dprintf "UNAME_S=[%s] UNAME_P=[%s] UNAME_R=[%s]" \
"$UNAME_S" "$UNAME_P" "$UNAME_R"
f_dprintf "%s: Successfully loaded." common.subr
fi # ! $_COMMON_SUBR