toybox_scripts_functions.sh

#!/bin/sh
addline()
{
  NEXT="$(printf "%s% $((50-${#LASTNAME}))d% 10d %10d" "$LASTNAME" "$OLD" "$NEW" "$DELTA")"
  [ -z "$STUFF" ] &&
    STUFF="$NEXT" ||
    STUFF="$(printf "%s\n%s" "$STUFF" "$NEXT")"
}

bloatcheck()
{
  if [ $# -ne 2 ]
  then
    echo "usage: bloatcheck old new"
    exit 1
  fi
  
  DIFF1=`mktemp base.XXXXXXX`
  DIFF2=`mktemp bloat.XXXXXXX`
  trap "rm $DIFF1 $DIFF2" EXIT
  nm --size-sort "$1" | sort -k3,3 > $DIFF1
  nm --size-sort "$2" | sort -k3,3 > $DIFF2
  diff -U 0 $DIFF1 $DIFF2 | tail -n +3 | sed -n 's/^\([-+]\)/\1 /p' \
    | sort -k4,4 | do_bloatcheck
}

change_sh()
{
# build each command as a standalone executable

  NOBUILD=1 make_sh > /dev/null &&
  ${HOSTCC:-cc} -I . scripts/install.c -o generated/instlist &&
  export PREFIX=${PREFIX:-change/} &&
  mkdir -p "$PREFIX" || exit 1

# Build all the commands standalone except:

# sh - shell builtins like "cd" and "exit" need the multiplexer
# help - needs to know what other commands are enabled (use command --help)

  for i in $(generated/instlist | egrep -vw "sh|help")
  do
    echo -n " $i" &&
    single_sh $i > /dev/null 2>$PREFIX/${i}.bad &&
      rm $PREFIX/${i}.bad || echo -n '*'
  done
  echo
}

configure(){
# Toybox configuration file.

# This sets environment variables used by scripts/make.sh

# A synonym.
[ -z "$CROSS_COMPILE" ] && CROSS_COMPILE="$CROSS"

# CFLAGS and OPTIMIZE are different so you can add extra CFLAGS without
# disabling default optimizations
[ -z "$CFLAGS" ] && CFLAGS="-Wall -Wundef -Wno-char-subscripts -Werror=implicit-function-declaration"
# Required for our expected ABI. we're 8-bit clean thus "char" must be unsigned.
CFLAGS="$CFLAGS -funsigned-char"
[ -z "$OPTIMIZE" ] && OPTIMIZE="-Os -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-strict-aliasing"

# We accept LDFLAGS, but by default don't have anything in it
[ -z "$LDOPTIMIZE" ] && LDOPTIMIZE="-Wl,--gc-sections"

# The makefile provides defaults for these, so this only gets used if
# you call scripts/make.sh and friends directly.

[ -z "$CC" ] && CC=cc

# If HOSTCC needs CFLAGS or LDFLAGS, just add them to the variable
# ala HOSTCC="blah-cc --static"
[ -z "$HOSTCC" ] && HOSTCC=cc
}

do_bloatcheck()
{
  LASTNAME=
  DELTA=0
  TOTAL=0
  OLD=0
  NEW=0
  STUFF=

  printf "name% 46s% 10s% 11s\n" old new delta
  echo "-----------------------------------------------------------------------"
  while read a b c d
  do
    THISNAME=$(echo "$d" | sed 's/[.][0-9]*$//')

    if [ "$LASTNAME" != "$THISNAME" ]
    then
      TOTAL=$(($TOTAL+$DELTA))
      [ $DELTA -ne 0 ] && addline
      LASTNAME="$THISNAME"
      DELTA=0
      OLD=0
      NEW=0
    fi

    SIZE=$(printf "%d" "0x$b")
    if [ "$a" == "-" ]
    then
      OLD=$(($OLD+$SIZE))
      SIZE=$((-1*$SIZE))
    else
      NEW=$(($NEW+$SIZE))
    fi
    DELTA=$(($DELTA+$SIZE))
  done

  TOTAL=$(($TOTAL+$DELTA))
  [ $DELTA -ne 0 ] && addline

  echo "$STUFF" | sort -k4,4nr
  echo "-----------------------------------------------------------------------"
  printf "% 71d total\n" "$TOTAL"
}

# Set up a chroot environment and run commands within it.
# Needed commands listed on command line
# Script fed to stdin.
dochroot()
{
  mkdir tmpdir4chroot
  mount -t ramfs tmpdir4chroot tmpdir4chroot
  mkdir -p tmpdir4chroot/{etc,sys,proc,tmp,dev}
  cp -L testing.sh tmpdir4chroot

  # Copy utilities from command line arguments

  echo -n "Setup chroot"
  mkchroot tmpdir4chroot $*
  echo

  mknod tmpdir4chroot/dev/tty c 5 0
  mknod tmpdir4chroot/dev/null c 1 3
  mknod tmpdir4chroot/dev/zero c 1 5

  # Copy script from stdin

  cat > tmpdir4chroot/test.sh
  chmod +x tmpdir4chroot/test.sh
  chroot tmpdir4chroot /test.sh
  umount -l tmpdir4chroot
  rmdir tmpdir4chroot
}

do_loudly()
{
  [ ! -z "$V" ] && echo "$@" || echo -n "$DOTPROG"
  "$@"
}

do_test()
{
  CMDNAME="${1##*/}"
  CMDNAME="${CMDNAME%.test}"
  if [ -z "$TEST_HOST" ]
  then
    [ -z "$2" ] && C="$(readlink -f ../$CMDNAME)" || C="$(which $CMDNAME)"
  else
    C="$CMDNAME"
  fi
  if [ ! -z "$C" ]
  then
    . "$1"
  else
    echo "$CMDNAME disabled"
  fi
}

findglobals_sh()
{
# Quick and dirty check to see if anybody's leaked global variables.
# We should have this, toy_list, toybuf, and toys.

  nm toybox_unstripped | grep '[0-9A-Fa-f]* [BCDGRS]' | cut -d ' ' -f 3
}

genbuildsh()
{
  # Write a canned build line for use on crippled build machines.

  echo "#!/bin/sh"
  echo
  echo "BUILD='$BUILD'"
  echo
  echo "FILES='$LIBFILES $TOYFILES'"
  echo
  echo "LINK='$LINK'"
  echo
  echo
  echo '$BUILD $FILES $LINK'
}

genconfig()
{
  # Reverse sort puts posix first, examples last.
  for j in $(ls toys/*/README | sort -s -r)
  do
    DIR="$(dirname "$j")"

    [ $(ls "$DIR" | wc -l) -lt 2 ] && continue

    echo "menu \"$(head -n 1 $j)\""
    echo

    # extract config stanzas from each source file, in alphabetical order
    for i in $(ls -1 $DIR/*.c)
    do
      # Grab the config block for Config.in
      echo "# $i"
      sed -n '/^\*\//q;/^config [A-Z]/,$p' $i || return 1
      echo
    done

    echo endmenu
  done
}

genconfig_sh()
{
# This has to be a separate function from make_sh so it can be called
# before menuconfig.  (It's called again from make_sh just to be sure.)

  mkdir -p generated

  . configure

  probeconfig > generated/Config.probed || rm generated/Config.probed
  genconfig > generated/Config.in || rm generated/Config.in
  WORKING=
  PENDING=
  toys toys/*/*.c | (
  while IFS=":" read FILE NAME
  do
    [ "$NAME" == help ] && continue
    [ "$NAME" == install ] && continue
    echo -e "$NAME: $FILE *.[ch] lib/*.[ch]\n\tscripts/toybox.sh single_sh $NAME\n"
    echo -e "test_$NAME:\n\tscripts/toybox.sh test_sh $NAME\n"
    [ "${FILE/pending//}" != "$FILE" ] &&
      PENDING="$PENDING $NAME" ||
      WORKING="$WORKING $NAME"
  done &&
  echo -e "clean::\n\trm -f $WORKING $PENDING" &&
  echo -e "list:\n\t@echo $(echo $WORKING | tr ' ' '\n' | sort | xargs)" &&
  echo -e "list_pending:\n\t@echo $(echo $PENDING | tr ' ' '\n' | sort | xargs)" &&
  echo -e ".PHONY: $WORKING $PENDING" | sed 's/ \([^ ]\)/ test_\1/g'
  ) > .singlemake
}

# Extract global structure definitions and flag definitions from toys/*/*.c
getglobals()
{
  for i in toys/*/*.c
  do
    NAME="$(echo $i | $SED 's@.*/\(.*\)\.c@\1@')"
    DATA="$($SED -n -e '/^GLOBALS(/,/^)/b got;b;:got' \
            -e 's/^GLOBALS(/struct '"$NAME"'_data {/' \
            -e 's/^)/};/' -e 'p' $i)"

    [ ! -z "$DATA" ] && echo -e "// $i\n\n$DATA\n"
  done
}

install_sh()
{
# Grab default values for $CFLAGS and such.

. ./configure

[ -z "$PREFIX" ] && PREFIX="/usr/toybox"

# Parse command line arguments.

LONG_PATH=""
while [ ! -z "$1" ]
do
  # Create symlinks instead of hardlinks?
  [ "$1" == "--symlink" ] && LINK_TYPE="-s"

  # Uninstall?
  [ "$1" == "--uninstall" ] && UNINSTALL=Uninstall

  # Delete destination command if it exists?
  [ "$1" == "--force" ] && DO_FORCE="-f"

  # Use {,usr}/{bin,sbin} paths instead of all files in one directory?
  [ "$1" == "--long" ] && LONG_PATH="bin/"

  # Symlink host toolchain binaries to destination to create cross compile $PATH
  [ "$1" == "--airlock" ] && AIRLOCK=1

  shift
done

echo "Compile instlist..."

NOBUILD=1 make_sh
$DEBUG $HOSTCC -I . scripts/install.c -o generated/instlist || exit 1
COMMANDS="$(generated/instlist $LONG_PATH)"

echo "${UNINSTALL:-Install} commands..."

# Copy toybox itself

if [ -z "$UNINSTALL" ]
then
  mkdir -p "${PREFIX}/${LONG_PATH}" &&
  rm -f "${PREFIX}/${LONG_PATH}/toybox" &&
  cp toybox ${PREFIX}/${LONG_PATH} || exit 1
else
  rm -f "${PREFIX}/${LONG_PATH}/toybox" 2>/dev/null
fi
cd "$PREFIX" || exit 1

# Make links to toybox

EXIT=0

for i in $COMMANDS
do
  # Figure out target of link

  if [ -z "$LONG_PATH" ]
  then
    DOTPATH=""
  else
    # Create subdirectory for command to go in (if necessary)

    DOTPATH="$(dirname "$i")"/
    if [ -z "$UNINSTALL" ]
    then
      mkdir -p "$DOTPATH" || exit 1
    fi

    if [ -z "$LINK_TYPE" ]
    then
      DOTPATH="bin/"
    else
      if [ "$DOTPATH" != "$LONG_PATH" ]
      then
        # For symlinks we need ../../bin style relative paths
        DOTPATH="$(echo $DOTPATH | sed -e 's@[^/]*/@../@g')"$LONG_PATH
      else
        DOTPATH=""
      fi
    fi
  fi

  # Create link
  if [ -z "$UNINSTALL" ]
  then
    ln $DO_FORCE $LINK_TYPE ${DOTPATH}toybox $i || EXIT=1
  else
    rm -f $i || EXIT=1
  fi
done

[ -z "$AIRLOCK" ] && exit 0

# --airlock creates a single directory you can point the $PATH to for cross
# compiling, which contains just toybox and symlinks to toolchain binaries.

# This not only means you're building with a known set of tools (insulated from
# variations in the host distro), but that everything else is NOT in your PATH
# and thus various configure stages won't find things on thie host that won't
# be there on the target (such as the distcc build noticing the host has
# python and deciding to #include Python.h).

# The following are commands toybox should provide, but doesn't yet.
# For now symlink the host version. This list must go away by 1.0.

PENDING="bunzip2 bzcat dd diff expr ftpd ftpget ftpput gunzip less ping route tar test tr vi wget zcat awk bzip2 fdisk gzip sh sha512sum unxz xzcat bc"

# "gcc" should go away for llvm, but some things still hardwire it
TOOLCHAIN="ar as nm cc make ld gcc objdump"

if [ ! -z "$AIRLOCK" ]
then

  # Tools needed to build packages
  for i in $TOOLCHAIN $PENDING $HOST_EXTRA
  do
    if [ ! -f "$i" ]
  then
    # Loop through each instance, populating fallback directories (used by
    # things like distcc, which require multiple instances of the same binary
    # in a known order in the $PATH).

    X=0
    FALLBACK="$PREFIX"
    which -a "$i" | while read j
    do
      if [ ! -e "$FALLBACK/$i" ]
      then
        mkdir -p "$FALLBACK" &&
        ln -sf "$j" "$FALLBACK/$i" || exit 1
      fi

      X=$[$X+1]
      FALLBACK="$PREFIX/fallback-$X"
    done

    if [ ! -f "$PREFIX/$i" ]
    then
      echo "Toolchain component missing: $i" >&2
      [ -z "$PEDANTIC" ] || EXIT=1
    fi
  fi
done



fi

exit $EXIT
}

# Is anything under directory $2 newer than file $1
isnewer()
{
  CHECK="$1"
  shift
  [ ! -z "$(find "$@" -newer "$CHECK" 2>/dev/null || echo yes)" ]
}

# Process config.h and newtoys.h to generate FLAG_x macros. Note we must
# always #define the relevant macro, even when it's disabled, because we
# allow multiple NEWTOY() in the same C file. (When disabled the FLAG is 0,
# so flags&0 becomes a constant 0 allowing dead code elimination.)
make_flagsh()
{
  # Parse files through C preprocessor twice, once to get flags for current
  # .config and once to get flags for allyesconfig
  for I in A B
  do
    (
    # define macros and select header files with option string data

    echo "#define NEWTOY(aa,bb,cc) aa $I bb"
    echo '#define OLDTOY(...)'
    if [ "$I" == A ]
    then
      cat generated/config.h
    else
      $SED '/USE_.*([^)]*)$/s/$/ __VA_ARGS__/' generated/config.h
    fi
    echo '#include "lib/toyflags.h"'
    cat generated/newtoys.h

    # Run result through preprocessor, glue together " " gaps leftover from USE
    # macros, delete comment lines, print any line with a quoted optstring,
    # turn any non-quoted opstring (NULL or 0) into " " (because fscanf can't
    # handle "" with nothing in it, and mkflags uses that).

    ) | ${CROSS_COMPILE}${CC} -E - | \
    $SED -n -e 's/" *"//g;/^#/d;t clear;:clear;s/"/"/p;t;s/\( [AB] \).*/\1 " "/p'

  # Sort resulting line pairs and glue them together into triplets of
  #   command "flags" "allflags"
  # to feed into mkflags C program that outputs actual flag macros
  # If no pair (because command's disabled in config), use " " for flags
  # so allflags can define the appropriate zero macros.

  done | sort -s | $SED -n -e 's/ A / /;t pair;h;s/\([^ ]*\).*/\1 " "/;x' \
    -e 'b single;:pair;h;n;:single;s/[^ ]* B //;H;g;s/\n/ /;p' | \
    tee generated/flags.raw | generated/mkflags > generated/flags.h || exit 1
}

make_sh()
{
# Grab default values for $CFLAGS and such.

export LANG=c
export LC_ALL=C
set -o pipefail
. ./configure

[ -z "$KCONFIG_CONFIG" ] && KCONFIG_CONFIG=.config
[ -z "$OUTNAME" ] && OUTNAME=toybox
UNSTRIPPED="generated/unstripped/$(basename "$OUTNAME")"

# Since each cc invocation is short, launch half again as many processes
# as we have processors so they don't exit faster than we can start them.
[ -z "$CPUS" ] && CPUS=$(($(nproc)+1))

if [ -z "$SED" ]
then
  [ ! -z "$(which gsed 2>/dev/null)" ] && SED=gsed || SED=sed
fi

# Respond to V= by echoing command lines as well as running them
DOTPROG=

echo "Generate headers from toys/*/*.c..."

mkdir -p generated/unstripped

if isnewer generated/Config.in toys
then
  echo "Extract configuration information from toys/*.c files..."
  genconfig_sh
fi

# Create a list of all the commands toybox can provide. Note that the first
# entry is out of order on purpose (the toybox multiplexer command must be the
# first element of the array). The rest must be sorted in alphabetical order
# for fast binary search.

if isnewer generated/newtoys.h toys
then
  echo -n "generated/newtoys.h "

  echo "USE_TOYBOX(NEWTOY(toybox, NULL, TOYFLAG_STAYROOT))" > generated/newtoys.h
  $SED -n -e 's/^USE_[A-Z0-9_]*(/&/p' toys/*/*.c \
	| $SED 's/\(.*TOY(\)\([^,]*\),\(.*\)/\2 \1\2,\3/' | sort -s -k 1,1 \
	| $SED 's/[^ ]* //'  >> generated/newtoys.h
  [ $? -ne 0 ] && exit 1
fi

[ ! -z "$V" ] && echo "Which C files to build..."

# Extract a list of toys/*/*.c files to compile from the data in $KCONFIG_CONFIG
# (First command names, then filenames with relevant {NEW,OLD}TOY() macro.)

[ -d ".git" ] && GITHASH="$(git describe --tags --abbrev=12 2>/dev/null)"
[ ! -z "$GITHASH" ] && GITHASH="-DTOYBOX_VERSION=\"$GITHASH\""
TOYFILES="$($SED -n 's/^CONFIG_\([^=]*\)=.*/\1/p' "$KCONFIG_CONFIG" | xargs | tr ' [A-Z]' '|[a-z]')"
TOYFILES="$(egrep -l "TOY[(]($TOYFILES)[ ,]" toys/*/*.c)"
CFLAGS="$CFLAGS $(cat generated/cflags)"
BUILD="$(echo ${CROSS_COMPILE}${CC} $CFLAGS -I . $OPTIMIZE $GITHASH)"
LIBFILES="$(ls lib/*.c | grep -v lib/help.c)"
TOYFILES="lib/help.c main.c $TOYFILES"

if [ "${TOYFILES/pending//}" != "$TOYFILES" ]
then
  echo -e "\n\033[1;31mwarning: using unfinished code from toys/pending\033[0m"
fi

if ! cmp -s <(genbuildsh | head -n 3) \
          <(head -n 3 generated/build.sh 2>/dev/null)
then
  echo -n "Library probe"

  # We trust --as-needed to remove each library if we don't use any symbols
  # out of it, this loop is because the compiler has no way to ignore a library
  # that doesn't exist, so we have to detect and skip nonexistent libraries
  # for it.

  > generated/optlibs.dat
  for i in util crypt m resolv selinux smack attr rt crypto z log
  do
    echo "int main(int argc, char *argv[]) {return 0;}" | \
    ${CROSS_COMPILE}${CC} $CFLAGS -xc - -o generated/libprobe -Wl,--as-needed -l$i > /dev/null 2>/dev/null &&
    echo -l$i >> generated/optlibs.dat
    echo -n .
  done
  rm -f generated/libprobe
  echo
fi

# LINK needs optlibs.dat, above

LINK="$(echo $LDOPTIMIZE $LDFLAGS -o "$UNSTRIPPED" -Wl,--as-needed $(cat generated/optlibs.dat))"
genbuildsh > generated/build.sh && chmod +x generated/build.sh || exit 1

#TODO: "make $SED && make" doesn't regenerate config.h because diff .config
if true #isnewer generated/config.h "$KCONFIG_CONFIG"
then
  echo "Make generated/config.h from $KCONFIG_CONFIG."

  # This long and roundabout sed invocation is to make old versions of sed
  # happy. New ones have '\n' so can replace one line with two without all
  # the branches and tedious mucking about with hold space.

  $SED -n \
    -e 's/^# CONFIG_\(.*\) is not set.*/\1/' \
    -e 't notset' \
    -e 's/^CONFIG_\(.*\)=y.*/\1/' \
    -e 't isset' \
    -e 's/^CONFIG_\([^=]*\)=\(.*\)/#define CFG_\1 \2/p' \
    -e 'd' \
    -e ':notset' \
    -e 'h' \
    -e 's/.*/#define CFG_& 0/p' \
    -e 'g' \
    -e 's/.*/#define USE_&(...)/p' \
    -e 'd' \
    -e ':isset' \
    -e 'h' \
    -e 's/.*/#define CFG_& 1/p' \
    -e 'g' \
    -e 's/.*/#define USE_&(...) __VA_ARGS__/p' \
    $KCONFIG_CONFIG > generated/config.h || exit 1
fi

if [ generated/mkflags -ot scripts/mkflags.c ]
then
  do_loudly $HOSTCC scripts/mkflags.c -o generated/mkflags || exit 1
fi

if isnewer generated/flags.h toys "$KCONFIG_CONFIG"
then
  echo -n "generated/flags.h "
  make_flagsh
fi

if isnewer generated/globals.h toys
then
  echo -n "generated/globals.h "
  GLOBSTRUCT="$(getglobals)"
  (
    echo "$GLOBSTRUCT"
    echo
    echo "extern union global_union {"
    echo "$GLOBSTRUCT" | \
      $SED -n 's/struct \(.*\)_data {/	struct \1_data \1;/p'
    echo "} this;"
  ) > generated/globals.h
fi

if [ generated/mktags -ot scripts/mktags.c ]
then
  do_loudly $HOSTCC scripts/mktags.c -o generated/mktags || exit 1
fi

if isnewer generated/tags.h toys
then
  echo -n "generated/tags.h "

  $SED -n '/TAGGED_ARRAY(/,/^)/{s/.*TAGGED_ARRAY[(]\([^,]*\),/\1/;p}' \
    toys/*/*.c lib/*.c | generated/mktags > generated/tags.h
fi

if [ generated/config2help -ot scripts/config2help.c ]
then
  do_loudly $HOSTCC scripts/config2help.c -I . lib/xwrap.c lib/llist.c \
    lib/lib.c lib/portability.c -o generated/config2help || exit 1
fi
if isnewer generated/help.h generated/Config.in
then
  echo "generated/help.h"
  generated/config2help Config.in $KCONFIG_CONFIG > generated/help.h || exit 1
fi

[ ! -z "$NOBUILD" ] && exit 0

echo -n "Compile toybox"
[ ! -z "$V" ] && echo
DOTPROG=.

# This is a parallel version of: do_loudly $BUILD $FILES $LINK || exit 1

# Any headers newer than the oldest generated/obj file?
X="$(ls -1t generated/obj/* 2>/dev/null | tail -n 1)"
# TODO: redo this
if [ ! -e "$X" ] || [ ! -z "$(find toys -name "*.h" -newer "$X")" ]
then
  rm -rf generated/obj && mkdir -p generated/obj || exit 1
else
  rm -f generated/obj/{main,lib_help}.o || exit 1
fi

# build each generated/obj/*.o file in parallel

PENDING=
LNKFILES=
DONE=0
COUNT=0
CLICK=

for i in $LIBFILES click $TOYFILES
do
  [ "$i" == click ] && CLICK=1 && continue

  X=${i/lib\//lib_}
  X=${X##*/}
  OUT="generated/obj/${X%%.c}.o"
  LNKFILES="$LNKFILES $OUT"

  # $LIBFILES doesn't need to be rebuilt if newer than .config, $TOYFILES does

  [ "$OUT" -nt "$i" ] && [ -z "$CLICK" -o "$OUT" -nt "$KCONFIG_CONFIG" ] &&
    continue

  do_loudly $BUILD -c $i -o $OUT &
  PENDING="$PENDING $!"
  COUNT=$(($COUNT+1))

  # ratelimit to $CPUS many parallel jobs, detecting errors

  for j in $PENDING
  do
    [ "$COUNT" -lt "$CPUS" ] && break;

    wait $j
    DONE=$(($DONE+$?))
    COUNT=$(($COUNT-1))
    PENDING="${PENDING## $j}"
  done
  [ $DONE -ne 0 ] && break
done

# wait for all background jobs, detecting errors

for i in $PENDING
do
  wait $i
  DONE=$(($DONE+$?))
done

[ $DONE -ne 0 ] && exit 1

do_loudly $BUILD $LNKFILES $LINK || exit 1
if [ ! -z "$NOSTRIP" ] ||
  ! do_loudly ${CROSS_COMPILE}strip "$UNSTRIPPED" -o "$OUTNAME"
then
  echo "strip failed, using unstripped" && cp "$UNSTRIPPED" "$OUTNAME" ||
  exit 1
fi

# gcc 4.4's strip command is buggy, and doesn't set the executable bit on
# its output the way SUSv4 suggests it do so. While we're at it, make sure
# we don't have the "w" bit set so things like bzip2's "cp -f" install don't
# overwrite our binary through the symlink.
do_loudly chmod 555 "$OUTNAME" || exit 1

echo
}

minicom_sh()
{
# If you want to use toybox netcat to talk to a serial port, use this.

if [ ! -c "$1" ]
then
  echo "Usage: minicom_sh /dev/ttyS0"
  exit 1
fi

SPEED="$2"
[ -z "$SPEED" ] && SPEED=115200

stty $SPEED -F "$1"
stty raw -echo -ctlecho -F "$1"
stty raw -echo  # Need to do it on stdin, too.
./toybox netcat -f "$1"
stty cooked echo  # Put stdin back.
}

# Recursively grab an executable and all the libraries needed to run it.
# Source paths beginning with / will be copied into destpath, otherwise
# the file is assumed to already be there and only its library dependencies
# are copied.
mkchroot()
{
  [ $# -lt 2 ] && return

  echo -n .

  dest=$1
  shift
  for i in "$@"
  do
    case "$i" in
    /*);;
    *)i=`which $i`;;
    esac
    [ -f "$dest/$i" ] && continue
    if [ -e "$i" ]
    then
      d=`echo "$i" | grep -o '.*/'` &&
      mkdir -p "$dest/$d" &&
      cat "$i" > "$dest/$i" &&
      chmod +x "$dest/$i"
    else
      echo "Not found: $i"
    fi
    mkchroot "$dest" $(ldd "$i" | egrep -o '/.* ')
  done
}

optional()
{
  option=`echo "$OPTIONFLAGS" | egrep "(^|:)$1(:|\$)"`
  # Not set?
  if [ -z "$1" ] || [ -z "$OPTIONFLAGS" ] || [ ${#option} -ne 0 ]
  then
    SKIP=""
    return
  fi
  SKIP=1
}

probecc()
{
  ${CROSS_COMPILE}${CC} $CFLAGS -xc -o /dev/null $1 -
}

probeconfig()
{
  > generated/cflags
  # llvm produces its own really stupid warnings about things that aren't wrong,
  # and although you can turn the warning off, gcc reacts badly to command line
  # arguments it doesn't understand. So probe.
  [ -z "$(probecc -Wno-string-plus-int <<< \#warn warn 2>&1 | grep string-plus-int)" ] &&
    echo -Wno-string-plus-int >> generated/cflags

  # Probe for container support on target
  probesymbol TOYBOX_CONTAINER << EOF
    #include <linux/sched.h>
    int x=CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET;
    int main(int argc, char *argv[]) { setns(0,0); return unshare(x); }
EOF

  probesymbol TOYBOX_FIFREEZE -c << EOF
    #include <linux/fs.h>
    #ifndef FIFREEZE
    #error nope
    #endif
EOF

  # Work around some uClibc limitations
  probesymbol TOYBOX_ICONV -c << EOF
    #include "iconv.h"
EOF
  probesymbol TOYBOX_FALLOCATE << EOF
    #include <fcntl.h>
    int main(int argc, char *argv[]) { return posix_fallocate(0,0,0); }
EOF
  
  # Android and some other platforms miss utmpx
  probesymbol TOYBOX_UTMPX -c << EOF
    #include <utmpx.h>
    #ifndef BOOT_TIME
    #error nope
    #endif
    int main(int argc, char *argv[]) {
      struct utmpx *a; 
      if (0 != (a = getutxent())) return 0;
      return 1;
    }
EOF

  # Android is missing shadow.h
  probesymbol TOYBOX_SHADOW -c << EOF
    #include <shadow.h>
    int main(int argc, char *argv[]) {
      struct spwd *a = getspnam("root"); return 0;
    }
EOF

  # Some commands are android-specific
  probesymbol TOYBOX_ON_ANDROID -c << EOF
    #ifndef __ANDROID__
    #error nope
    #endif
EOF

  probesymbol TOYBOX_ANDROID_SCHEDPOLICY << EOF
    #include <cutils/sched_policy.h>
    int main(int argc,char *argv[]) { get_sched_policy_name(0); }
EOF

  # nommu support
  probesymbol TOYBOX_FORK << EOF
    #include <unistd.h>
    int main(int argc, char *argv[]) { return fork(); }
EOF
  echo -e '\tdepends on !TOYBOX_MUSL_NOMMU_IS_BROKEN'

  probesymbol TOYBOX_PRLIMIT << EOF
    #include <sys/time.h>
    #include <sys/resource.h>
    int main(int argc, char *argv[]) { prlimit(0, 0, 0, 0); }
EOF
}

# Probe for a single config symbol with a "compiles or not" test.
# Symbol name is first argument, flags second, feed C file to stdin
probesymbol()
{
  probecc $2 2>/dev/null && DEFAULT=y || DEFAULT=n
  rm a.out 2>/dev/null
  echo -e "config $1\n\tbool" || exit 1
  echo -e "\tdefault $DEFAULT\n" || exit 1
}

runtest_sh()
{
# Simple test harness infrastructure
#
# Copyright 2005 by Rob Landley

# This file defines two main functions, "testcmd" and "optional". The
# first performs a test, the second enables/disables tests based on
# configuration options.

# The following environment variables enable optional behavior in "testing":
#    DEBUG - Show every command run by test script.
#    VERBOSE - Print the diff -u of each failed test case.
#              If equal to "fail", stop after first failed test.
#
# The "testcmd" function takes five arguments:
#	$1) Description to display when running command
#	$2) Command line arguments to command
#	$3) Expected result (on stdout)
#	$4) Data written to file "input"
#	$5) Data written to stdin
#
# The "testing" function is like testcmd but takes a complete command line
# (I.E. you have to include the command name.) The variable $C is an absolute
# path to the command being tested, which can bypass shell builtins.
#
# The exit value of testcmd is the exit value of the command it ran.
#
# The environment variable "FAILCOUNT" contains a cumulative total of the
# number of failed tests.
#
# The "optional" function is used to skip certain tests (by setting the
# environment variable SKIP), ala:
#   optional CFG_THINGY
#
# The "optional" function checks the environment variable "OPTIONFLAGS",
# which is either empty (in which case it always clears SKIP) or
# else contains a colon-separated list of features (in which case the function
# clears SKIP if the flag was found, or sets it to 1 if the flag was not found).

export FAILCOUNT=0
export SKIP=

# Helper functions

# Check config to see if option is enabled, set SKIP if not.

SHOWPASS=PASS
SHOWFAIL=FAIL
SHOWSKIP=SKIP

if tty -s <&1
then
  SHOWPASS="$(echo -e "\033[1;32m${SHOWPASS}\033[0m")"
  SHOWFAIL="$(echo -e "\033[1;31m${SHOWFAIL}\033[0m")"
  SHOWSKIP="$(echo -e "\033[1;33m${SHOWSKIP}\033[0m")"
fi
}

showasm()
{
# Copyright 2006 Rob Landley <rob@landley.net>

# Dumb little utility function to print out the assembly dump of a single
# function, or list the functions so dumpable in an executable.  You'd think
# there would be a way to get objdump to do this, but I can't find it.

[ $# -lt 1 ] || [ $# -gt 2 ] && { echo "usage: showasm file function"; exit 1; }

[ ! -f $1 ] && { echo "File $1 not found"; exit 1; }

if [ $# -eq 1 ]
then
  objdump -d $1 | sed -n -e 's/^[0-9a-fA-F]* <\(.*\)>:$/\1/p'
  exit 0
fi

objdump -d $1 | sed -n -e '/./{H;$!d}' -e "x;/^.[0-9a-fA-F]* <$2>:/p"
}

# Build a standalone toybox command
single_sh(){
if [ -z "$1" ]
then
  echo "usage: single_sh command..." >&2
  exit 1
fi

# Harvest TOYBOX_* symbols from .config
if [ ! -e .config ]
then
  echo "Need .config for toybox global settings. Run defconfig/menuconfig." >&2
  exit 1
fi

# Force dependencies to rebuild headers if we build multiplexer after this.
touch -c .config

export KCONFIG_CONFIG=.singleconfig
for i in "$@"
do
  echo -n "$i:"
  TOYFILE="$(egrep -l "TOY[(]($i)[ ,]" toys/*/*.c)"

  if [ -z "$TOYFILE" ]
  then
    echo "Unknown command '$i'" >&2
    exit 1
  fi

  # Enable stuff this command depends on
  DEPENDS="$(sed -n "/^config *$i"'$/,/^$/{s/^[ \t]*depends on //;T;s/[!][A-Z0-9_]*//g;s/ *&& */|/g;p}' $TOYFILE | xargs | tr ' ' '|')"

  NAME=$(echo $i | tr a-z- A-Z_)
  make allnoconfig > /dev/null &&
  sed -ri -e '/CONFIG_TOYBOX/d' \
    -e "s/# (CONFIG_($NAME|${NAME}_.*${DEPENDS:+|$DEPENDS})) is not set/\1=y/" \
    "$KCONFIG_CONFIG" &&
  echo "# CONFIG_TOYBOX is not set" >> "$KCONFIG_CONFIG" &&
  grep "CONFIG_TOYBOX_" .config >> "$KCONFIG_CONFIG" &&

  rm -f "$PREFIX$i" &&
  OUTNAME="$PREFIX$i" make_sh || exit 1
done
}

test_sh(){

TOPDIR="$PWD"
FILES="$PWD"/tests/files

trap 'kill $(jobs -p) 2>/dev/null; exit 1' INT

rm -rf generated/testdir
mkdir -p generated/testdir/testdir

if [ -z "$TEST_HOST" ]
then
  if [ $# -ne 0 ]
  then
    PREFIX=generated/testdir/ single_sh "$@" || exit 1
  else
    make install_flat PREFIX=generated/testdir || exit 1
  fi
fi

cd generated/testdir
PATH="$PWD:$PATH"
cd testdir
export LC_COLLATE=C

runtest_sh
[ -f "$TOPDIR/generated/config.h" ] && export OPTIONFLAGS=:$(echo $(sed -nr 's/^#define CFG_(.*) 1/\1/p' "$TOPDIR/generated/config.h") | sed 's/ /:/g')

if [ $# -ne 0 ]
then
  for i in "$@"
  do
    do_test "$TOPDIR"/tests/$i.test
  done
else
  for i in "$TOPDIR"/tests/*.test
  do
    if [ -z "$TEST_HOST" ]
    then
      do_test "$i" 1
    else
      rm -rf testdir && mkdir testdir && cd testdir || exit 1
      do_test "$i"
      cd ..
    fi
  done
fi
}
testcmd()
{
  wrong_args "$@"

  testing "$1" "$C $2" "$3" "$4" "$5"
}

# The testing function
testing()
{
  wrong_args "$@"

  NAME="$CMDNAME $1"
  [ -z "$1" ] && NAME=$2

  [ -n "$DEBUG" ] && set -x

  if [ -n "$SKIP" ] || ( [ -n "$SKIP_HOST" ] && [ -n "$TEST_HOST" ])
  then
    [ ! -z "$VERBOSE" ] && echo "$SHOWSKIP: $NAME"
    return 0
  fi

  echo -ne "$3" > expected
  echo -ne "$4" > input
  echo -ne "$5" | ${EVAL:-eval} "$2" > actual
  RETVAL=$?

  # Catch segfaults
  [ $RETVAL -gt 128 ] && [ $RETVAL -lt 255 ] &&
    echo "exited with signal (or returned $RETVAL)" >> actual

  DIFF="$(diff -au${NOSPACE:+b} expected actual)"
  if [ ! -z "$DIFF" ]
  then
    FAILCOUNT=$[$FAILCOUNT+1]
    echo "$SHOWFAIL: $NAME"
    if [ -n "$VERBOSE" ]
    then
      [ ! -z "$4" ] && echo "echo -ne \"$4\" > input"
      echo "echo -ne '$5' |$EVAL $2"
      echo "$DIFF"
      [ "$VERBOSE" == fail ] && exit 1
    fi
  else
    echo "$SHOWPASS: $NAME"
  fi
  rm -f input expected actual

  [ -n "$DEBUG" ] && set +x

  return 0
}

# Find names of commands that can be built standalone in these C files
toys()
{
  grep 'TOY(.*)' "$@" | grep -v TOYFLAG_NOFORK | grep -v "0))" | \
    sed -rn 's/([^:]*):.*(OLD|NEW)TOY\( *([a-zA-Z][^,]*) *,.*/\1:\3/p'
}

wrong_args()
{
  if [ $# -ne 5 ]
  then
    echo "Test $NAME has the wrong number of arguments ($# $*)" >&2
    exit
  fi
}