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nerves_system_br

1.4.3
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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 "$RELEASE_DIR/lib" -o ! -d "$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 "$STRIP" -o ! -e "$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 "*gz" \

                                 -o -name "start.boot" \

                                 -o -name "start_clean.boot" \

                                 \) -delete



#

# Scrub the executables

#



readelf_headers()

{

    if ! "$READELF" -h "$1" 2>/dev/null; then

        echo "not_elf"

    fi

}



executable_type()

{

    FILE="$1"

    READELF_OUTPUT="$2"



    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 "$ELF_MACHINE;$ELF_FLAGS"

}



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 "$tmpfile" "$(readelf_headers "$tmpfile")"

    rm "$tmpfile"

}



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

EXPECTED_TYPE=$(get_expected_executable_type)



for EXECUTABLE in $EXECUTABLES; do

    READELF_OUTPUT=$(readelf_headers "$EXECUTABLE")

    if [ "$READELF_OUTPUT" != "not_elf" ]; then

        # Verify that the executable was compiled for the target

        TYPE=$(executable_type "$EXECUTABLE" "$READELF_OUTPUT")

        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 may have been compiled for the host or a different target."

            echo " Make sure that nerves-env.sh has been sourced and rebuild to fix this."

            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