6089bf07c7
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.
694 lines
18 KiB
Plaintext
694 lines
18 KiB
Plaintext
if [ ! "$_COMMON_SUBR" ]; then _COMMON_SUBR=1
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#
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# Copyright (c) 2012 Ron McDowell
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# Copyright (c) 2012-2013 Devin Teske
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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############################################################ CONFIGURATION
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#
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# Default file descriptors to link to stdout/stderr for passthru allowing
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# redirection within a sub-shell to bypass directly to the terminal.
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#
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: ${TERMINAL_STDOUT_PASSTHRU:=3}}
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: ${TERMINAL_STDERR_PASSTHRU:=4}}
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############################################################ GLOBALS
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#
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# Program name
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#
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pgm="${0##*/}"
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#
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# Program arguments
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#
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ARGC="$#"
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ARGV="$@"
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#
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# Global exit status variables
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#
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SUCCESS=0
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FAILURE=1
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#
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# Operating environment details
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#
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export UNAME_S="$(uname -s)" # Operating System (i.e. FreeBSD)
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export UNAME_P="$(uname -p)" # Processor Architecture (i.e. i386)
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export UNAME_R="$(uname -r)" # Release Level (i.e. X.Y-RELEASE)
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#
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# Default behavior is to call f_debug_init() automatically when loaded.
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#
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: ${DEBUG_SELF_INITIALIZE=1}
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############################################################ FUNCTIONS
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# f_dprintf $fmt [ $opts ... ]
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#
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# Sensible debug function. Override in ~/.bsdconfigrc if desired.
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# See /usr/share/examples/bsdconfig/bsdconfigrc for example.
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#
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# If $debug is set and non-NULL, prints DEBUG info using printf(1) syntax:
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# + To $debugFile, if set and non-NULL
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# + To standard output if $debugFile is either NULL or unset
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# + To both if $debugFile begins with a single plus-sign (`+')
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#
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f_dprintf()
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{
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[ "$debug" ] || return $SUCCESS
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local fmt="$1"; shift
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case "$debugFile" in ""|+*)
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printf "DEBUG: $fmt${fmt:+\n}" "$@" >&${TERMINAL_STDOUT_PASSTHRU:-1}
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esac
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[ "${debugFile#+}" ] &&
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printf "DEBUG: $fmt${fmt:+\n}" "$@" >> "${debugFile#+}"
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return $SUCCESS
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}
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# f_debug_init
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#
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# Initialize debugging. Truncates $debugFile to zero bytes if set.
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#
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f_debug_init()
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{
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#
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# Process stored command-line arguments
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#
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( set -- "$ARGV"
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while getopts d flag > /dev/null; do
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case "$flag" in
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d) true; exit;;
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\?) continue;;
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esac
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done
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false
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) && debug=1
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debugFile=$( set -- "$ARGV"
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while getopts D flag > /dev/null; do
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case "$flag" in
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D) echo "$OPTARG";;
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\?) continue;;
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esac
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done
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)
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#
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# Make debugging persistant if set
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#
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[ "$debug" ] && export debug
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#
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# Truncate the debug file upon. Note that we will trim a leading plus
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# (`+') from the value of debugFile to support persistant meaning that
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# f_dprintf() should print both to standard output and $debugFile
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# (minus the leading plus, of course).
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#
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local _debug_file="${debugFile#+}"
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if [ "$_debug_file" ]; then
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if ( umask 022 && :> "$_debug_file" ); then
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f_dprintf "Successfully initialized debugFile \`%s'" \
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"$_debug_file"
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[ "${debug+set}" ] ||
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debug=1 # turn debugging on if not set
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else
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unset debugFile
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f_dprintf "Unable to initialize debugFile \`%s'" \
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"$_debug_file"
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fi
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fi
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}
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# f_err $fmt [ $opts ... ]
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#
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# Print a message to stderr (fd=2).
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#
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f_err()
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{
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printf "$@" >&${TERMINAL_STDERR_PASSTHRU:-2}
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}
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# f_quietly $command [ $arguments ... ]
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#
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# Run a command quietly (quell any output to stdout or stderr)
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#
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f_quietly()
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{
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"$@" > /dev/null 2>&1
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}
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# f_have $anything ...
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#
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# A wrapper to the `type' built-in. Returns true if argument is a valid shell
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# built-in, keyword, or externally-tracked binary, otherwise false.
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#
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f_have()
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{
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f_quietly type "$@"
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}
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# f_getvar $var_to_get [$var_to_set]
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#
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# Utility function designed to go along with the already-builtin setvar.
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# Allows clean variable name indirection without forking or sub-shells.
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#
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# Returns error status if the requested variable ($var_to_get) is not set.
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#
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# If $var_to_set is missing or NULL, the value of $var_to_get is printed to
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# standard output for capturing in a sub-shell (which is less-recommended
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# because of performance degredation; for example, when called in a loop).
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#
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f_getvar()
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{
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local __var_to_get="$1" __var_to_set="$2"
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[ "$__var_to_set" ] || local value
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eval ${__var_to_set:-value}=\"\${$__var_to_get}\"
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eval [ \"\${$__var_to_get+set}\" ]
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local __retval=$?
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eval f_dprintf '"f_getvar: var=[%s] value=[%s] r=%u"' \
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\"\$__var_to_get\" \"\$${__var_to_set:-value}\" \$__retval
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[ "$__var_to_set" ] || { [ "$value" ] && echo "$value"; }
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return $__retval
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}
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# f_die [ $status [ $fmt [ $opts ... ]]]
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#
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# Abruptly terminate due to an error optionally displaying a message in a
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# dialog box using printf(1) syntax.
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#
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f_die()
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{
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local status=$FAILURE
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# If there is at least one argument, take it as the status
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if [ $# -gt 0 ]; then
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status=$1
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shift 1 # status
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fi
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# If there are still arguments left, pass them to f_show_msg
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[ $# -gt 0 ] && f_show_msg "$@"
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# Optionally call f_clean_up() function if it exists
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f_have f_clean_up && f_clean_up
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exit $status
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}
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# f_interrupt
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#
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# Interrupt handler.
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#
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f_interrupt()
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{
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exec 2>&1 # fix sh(1) bug where stderr gets lost within async-trap
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f_die
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}
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# f_show_info $fmt [ $opts ... ]
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#
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# Display a message in a dialog infobox using printf(1) syntax.
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#
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f_show_info()
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{
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local msg
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msg=$( printf "$@" )
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#
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# Use f_dialog_infobox from dialog.subr if possible, otherwise fall
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# back to dialog(1) (without options, making it obvious when using
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# un-aided system dialog).
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#
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if f_have f_dialog_info; then
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f_dialog_info "$msg"
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else
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dialog --infobox "$msg" 0 0
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fi
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}
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# f_show_msg $fmt [ $opts ... ]
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#
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# Display a message in a dialog box using printf(1) syntax.
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#
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f_show_msg()
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{
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local msg
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msg=$( printf "$@" )
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#
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# Use f_dialog_msgbox from dialog.subr if possible, otherwise fall
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# back to dialog(1) (without options, making it obvious when using
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# un-aided system dialog).
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#
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if f_have f_dialog_msgbox; then
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f_dialog_msgbox "$msg"
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else
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dialog --msgbox "$msg" 0 0
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fi
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}
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# f_yesno $fmt [ $opts ... ]
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#
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# Display a message in a dialog yes/no box using printf(1) syntax.
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#
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f_yesno()
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{
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local msg
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msg=$( printf "$@" )
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#
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# Use f_dialog_yesno from dialog.subr if possible, otherwise fall
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# back to dialog(1) (without options, making it obvious when using
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# un-aided system dialog).
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#
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if f_have f_dialog_yesno; then
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f_dialog_yesno "$msg"
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else
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dialog --yesno "$msg" 0 0
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fi
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}
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# f_noyes $fmt [ $opts ... ]
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#
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# Display a message in a dialog yes/no box using printf(1) syntax.
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# NOTE: THis is just like the f_yesno function except "No" is default.
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#
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f_noyes()
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{
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local msg
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msg=$( printf "$@" )
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#
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# Use f_dialog_noyes from dialog.subr if possible, otherwise fall
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# back to dialog(1) (without options, making it obvious when using
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# un-aided system dialog).
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#
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if f_have f_dialog_noyes; then
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f_dialog_noyes "$msg"
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else
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dialog --defaultno --yesno "$msg" 0 0
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fi
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}
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# f_show_help $file
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#
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# Display a language help-file. Automatically takes $LANG and $LC_ALL into
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# consideration when displaying $file (suffix ".$LC_ALL" or ".$LANG" will
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# automatically be added prior to loading the language help-file).
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#
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# If a language has been requested by setting either $LANG or $LC_ALL in the
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# environment and the language-specific help-file does not exist we will fall
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# back to $file without-suffix.
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#
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# If the language help-file does not exist, an error is displayed instead.
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#
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f_show_help()
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{
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local file="$1"
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local lang="${LANG:-$LC_ALL}"
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[ -f "$file.$lang" ] && file="$file.$lang"
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#
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# Use f_dialog_textbox from dialog.subr if possible, otherwise fall
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# back to dialog(1) (without options, making it obvious when using
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# un-aided system dialog).
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#
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if f_have f_dialog_textbox; then
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f_dialog_textbox "$file"
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else
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dialog --msgbox "$( cat "$file" 2>&1 )" 0 0
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fi
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}
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# f_include $file
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#
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# Include a shell subroutine file.
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#
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# If the subroutine file exists but returns error status during loading, exit
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# is called and execution is prematurely terminated with the same error status.
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#
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f_include()
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{
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local file="$1"
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f_dprintf "f_include: file=[%s]" "$file"
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. "$file" || exit $?
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}
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# f_include_lang $file
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#
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# Include a language file. Automatically takes $LANG and $LC_ALL into
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# consideration when including $file (suffix ".$LC_ALL" or ".$LANG" will
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# automatically by added prior to loading the language file).
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#
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# No error is produced if (a) a language has been requested (by setting either
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# $LANG or $LC_ALL in the environment) and (b) the language file does not
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# exist -- in which case we will fall back to loading $file without-suffix.
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#
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# If the language file exists but returns error status during loading, exit
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# is called and execution is prematurely terminated with the same error status.
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#
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f_include_lang()
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{
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local file="$1"
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local lang="${LANG:-$LC_ALL}"
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f_dprintf "f_include_lang: file=[%s] lang=[%s]" "$file" "$lang"
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if [ -f "$file.$lang" ]; then
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. "$file.$lang" || exit $?
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else
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. "$file" || exit $?
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fi
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}
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# f_usage $file [ $key1 $value1 ... ]
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#
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# Display USAGE file with optional pre-processor macro definitions. The first
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# argument is the template file containing the usage text to be displayed. If
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# $LANG or $LC_ALL (in order of preference, respectively) is set, ".encoding"
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# will automatically be appended as a suffix to the provided $file pathname.
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#
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# When processing $file, output begins at the first line containing that is
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# (a) not a comment, (b) not empty, and (c) is not pure-whitespace. All lines
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# appearing after this first-line are output, including (a) comments (b) empty
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# lines, and (c) lines that are purely whitespace-only.
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#
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# If additional arguments appear after $file, substitutions are made while
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# printing the contents of the USAGE file. The pre-processor macro syntax is in
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# the style of autoconf(1), for example:
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#
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# f_usage $file "FOO" "BAR"
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#
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# Will cause instances of "@FOO@" appearing in $file to be replaced with the
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# text "BAR" before bering printed to the screen.
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#
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# This function is a two-parter. Below is the awk(1) portion of the function,
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# afterward is the sh(1) function which utilizes the below awk script.
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#
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f_usage_awk='
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BEGIN { found = 0 }
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{
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if ( !found && $0 ~ /^[[:space:]]*($|#)/ ) next
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found = 1
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print
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}
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'
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f_usage()
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{
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local file="$1"
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local lang="${LANG:-$LC_ALL}"
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f_dprintf "f_usage: file=[%s] lang=[%s]" "$file" "$lang"
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shift 1 # file
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local usage
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if [ -f "$file.$lang" ]; then
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usage=$( awk "$f_usage_awk" "$file.$lang" ) || exit $FAILURE
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else
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usage=$( awk "$f_usage_awk" "$file" ) || exit $FAILURE
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fi
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while [ $# -gt 0 ]; do
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local key="$1"
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export value="$2"
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usage=$( echo "$usage" | awk \
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"{ gsub(/@$key@/, ENVIRON[\"value\"]); print }" )
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shift 2
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done
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f_err "%s\n" "$usage"
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exit $FAILURE
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}
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# f_index_file $keyword
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#
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# Process all INDEX files known to bsdconfig and return the path to first file
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# containing a menu_selection line with a keyword portion matching $keyword.
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#
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# If $LANG or $LC_ALL (in order of preference, respectively) is set,
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# "INDEX.encoding" files will be searched first.
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#
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# If no file is found, error status is returned along with the NULL string.
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#
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# This function is a two-parter. Below is the awk(1) portion of the function,
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# afterward is the sh(1) function which utilizes the below awk script.
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#
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f_index_file_awk='
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# Variables that should be defined on the invocation line:
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# -v keyword="keyword"
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BEGIN { found = 0 }
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( $0 ~ "^menu_selection=\"" keyword "\\|" ) {
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print FILENAME
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found++
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exit
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}
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END { exit ! found }
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'
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f_index_file()
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{
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local keyword="$1"
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local lang="${LANG:-$LC_ALL}"
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f_dprintf "f_index_file: keyword=[%s] lang=[%s]" "$keyword" "$lang"
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if [ "$lang" ]; then
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awk -v keyword="$keyword" "$f_index_file_awk" \
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$BSDCFG_LIBE${BSDCFG_LIBE:+/}*/INDEX.$lang &&
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return
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# No match, fall-thru to non-i18n sources
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fi
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awk -v keyword="$keyword" "$f_index_file_awk" \
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$BSDCFG_LIBE${BSDCFG_LIBE:+/}*/INDEX
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}
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# f_index_menusel_keyword $indexfile $pgm
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#
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# Process $indexfile and return only the keyword portion of the menu_selection
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# line with a command portion matching $pgm.
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#
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# This function is for internationalization (i18n) mapping of the on-disk
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# scriptname ($pgm) into the localized language (given language-specific
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# $indexfile). If $LANG or $LC_ALL (in orderder of preference, respectively) is
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# set, ".encoding" will automatically be appended as a suffix to the provided
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# $indexfile pathname.
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#
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# If, within $indexfile, multiple $menu_selection values map to $pgm, only the
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# first one will be returned. If no mapping can be made, the NULL string is
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# returned.
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#
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# If $indexfile does not exist, error status is returned with NULL.
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#
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# This function is a two-parter. Below is the awk(1) portion of the function,
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# afterward is the sh(1) function which utilizes the below awk script.
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#
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f_index_menusel_keyword_awk='
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# Variables that should be defined on the invocation line:
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# -v pgm="program_name"
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#
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BEGIN {
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prefix = "menu_selection=\""
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plen = length(prefix)
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found = 0
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}
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{
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if (!match($0, "^" prefix ".*\\|.*\"")) next
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keyword = command = substr($0, plen + 1, RLENGTH - plen - 1)
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sub(/^.*\|/, "", command)
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sub(/\|.*$/, "", keyword)
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if ( command == pgm )
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|
{
|
|
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
|