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nerves_system_br

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Nerves System BR - Buildroot based build platform for Nerves Systems

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nerves_system_br scripts scrub-otp-release.sh
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scripts/scrub-otp-release.sh 

#!/bin/sh



# Remove or minimize files in an Erlang/OTP release directory

# in preparation for use packaging in a Nerves firmware image.

#

# scrub-otp-release.sh <Erlang/OTP release directory>



set -e

export LC_ALL=C



SCRIPT_NAME=$(basename "$0")

RELEASE_DIR="$1"



# Check that the release directory exists

if [ ! -d "$RELEASE_DIR" ]; then

    echo "$SCRIPT_NAME: ERROR: Missing Erlang/OTP release directory: ($RELEASE_DIR)"

    exit 1

fi



if [ ! -d "$RELEASE_DIR/lib" ] || [ ! -d "$RELEASE_DIR/releases" ]; then

    echo "$SCRIPT_NAME: ERROR: Expecting '$RELEASE_DIR' to contain 'lib' and 'releases' subdirectories"

    exit 1

fi



STRIP="$CROSSCOMPILE-strip"

READELF="$CROSSCOMPILE-readelf"

if [ ! -e "$STRIP" ] || [ ! -e "$READELF" ]; then

    echo "$SCRIPT_NAME: ERROR: Expecting \$CROSSCOMPILE to be set. Did you source nerves-env.sh?"

    echo "  \"mix firmware\" should do this for you. Please file an issue is using \"mix\"."

    echo "  Additional information:"

    echo "    strip=$STRIP"

    echo "    readelf=$READELF"

    exit 1

fi



# Clean up the Erlang release of all the files that we don't need.

# The user should create their releases without source code

# unless they want really big images..

rm -fr "${RELEASE_DIR:?}/bin" "$RELEASE_DIR"/erts-*



# Delete empty directories

find "$RELEASE_DIR" -type d -empty -delete



# Delete any temp files, release tarballs, etc from the base release directory

# Nothing is supposed to be there.

find "$RELEASE_DIR" -maxdepth 1 -type f -delete



# Clean up the releases directory

find "$RELEASE_DIR/releases" \( -name "*.sh" \

                                 -o -name "*.bat" \

                                 -o -name "*.ps1" \

                                 -o -name "*gz" \

                                 -o -name "start.boot" \

                                 -o -name "start_clean.boot" \

                                 -o -name "*.script" \

                                 \) -delete



#

# Scrub the executables

#



executable_type()

{

    FILE=$1



    # Try readelf first, since it's output seems more trustworthy for executables

    READELF_OUTPUT=$("$READELF" -h "$FILE" 2>/dev/null || true)

    if [ "$READELF_OUTPUT" ]; then

        ELF_MACHINE=$(echo "$READELF_OUTPUT" | sed -E -e '/^  Machine: +(.+)/!d; s//\1/;' | head -1)

        ELF_FLAGS=$(echo "$READELF_OUTPUT" | sed -E -e '/^  Flags: +(.+)/!d; s//\1/;' | head -1)



        if [ -z "$ELF_MACHINE" ]; then

            echo "$SCRIPT_NAME: ERROR: Didn't expect empty machine field in ELF header in $FILE." 1>&2

            echo "   Try running '$READELF -h $FILE' and" 1>&2

            echo "   and create an issue at https://github.com/nerves-project/nerves_system_br/issues." 1>&2

            exit 1

        fi

        echo "readelf:$ELF_MACHINE;$ELF_FLAGS"

    else

        # readelf didn't work, so try file and guess at things that will cause problems

        FILE_OUTPUT=$(file -b -h "$FILE")

        case "$FILE_OUTPUT" in

            *shared*library*)

                echo "file:$FILE_OUTPUT"

                ;;



            *x86_64*)

                echo "file:$FILE_OUTPUT"

                ;;



            *)

                echo "portable"

                ;;

        esac

    fi

}



get_expected_executable_type()

{

    # Compile a trivial C program with the crosscompiler

    # so that we know what the `file` output should look like.

    tmpfile=$(mktemp /tmp/scrub-otp-release.XXXXXX)

    echo "int main() {}" | "$CROSSCOMPILE-gcc" -x c -o "$tmpfile" -

    executable_type "$tmpfile"

    rm "$tmpfile"

}



EXECUTABLES=$(find "$RELEASE_DIR" -type f -perm -100)

EXPECTED_TYPE=$(get_expected_executable_type)



for EXECUTABLE in $EXECUTABLES; do

    TYPE=$(executable_type "$EXECUTABLE")

    if [ "$TYPE" != "portable" ]; then

        # Verify that the executable was compiled for the target

        if [ "$TYPE" != "$EXPECTED_TYPE" ]; then

            echo "$SCRIPT_NAME: ERROR: Unexpected executable format for '$EXECUTABLE'"

            echo

            echo "Got:"

            echo " $TYPE"

            echo

            echo "Expecting:"

            echo " $EXPECTED_TYPE"

            echo

            echo "This file was compiled for the host or a different target and probably"

            echo "will not work."

            echo

            echo "Check the following:"

            echo

            echo "1. Are you using a path dependency in your mix deps? If so, run"

            echo "   'mix clean' in that directory to avoid pulling in any of its"

            echo "   build products."

            echo

            echo "2. Did you recently upgrade to Nerves 1.3 or Distillery 2.0? Make"

            echo "   sure that your 'rel/config.exs' has 'plugin Nerves'. See"

            echo "   https://hexdocs.pm/nerves/updating-projects.html#updating-from-v1-0-to-v1-3-0"

            echo

            echo "3. Did you recently upgrade or change your Nerves system? If so,"

            echo "   try cleaning and rebuilding this project and its deps."

            echo

            echo "4. Are you building outside of Nerves' mix integration? If so,"

            echo "   make sure that you've sourced 'nerves-env.sh'."

            echo

            echo "If you're still having trouble, please file an issue on Github"

            echo "at https://github.com/nerves-project/nerves_system_br/issues."

            echo

            exit 1

        fi



        # Strip debug information from ELF binaries

        # Symbols are still available to the user in the release directory.

        $STRIP "$EXECUTABLE"

    fi

done