neiam /neiam-devices

#!/bin/sh
# Correct the control file of .debs built by cargo-deb, which is made
# for Rust binaries and gets two things wrong for data-only packages:
#
#  - It takes the architecture from the Rust target and has no way to
#    override it, but these packages hold only images, QML and script:
#    an amd64-labelled splash screen is one an arm64 device can't
#    install. They are rewritten as `Architecture: all`.
#  - With nothing to link against, its automatic dependencies come out
#    as an empty `Depends:` line, which dpkg need not accept. Empty
#    fields are dropped.
#
# Only the control member is repacked; the payload is left
# byte-for-byte alone.
#
#   tools/deb-fixup.sh target/debian/*.deb
set -eu

for deb in "$@"; do
    deb=$(realpath "$deb")
    work=$(mktemp -d)
    (
        cd "$work"
        ar x "$deb"
        mkdir control
        tar -xJf control.tar.xz -C control
        sed -i -e 's/^Architecture: .*/Architecture: all/' \
               -e '/^[A-Za-z-]*:[[:space:]]*$/d' control/control
        tar --owner=0 --group=0 --numeric-owner -cJf control.tar.xz -C control .
        rm "$deb"
        # dpkg requires this member order.
        ar rc "$deb" debian-binary control.tar.xz data.tar.*
    )
    rm -rf "$work"

    out=$(echo "$deb" | sed 's/_[^_]*\.deb$/_all.deb/')
    [ "$deb" = "$out" ] || mv "$deb" "$out"
    echo "$out"
done