UpdateController/update_psa_helpers

#!/bin/bash

# if [ ${git_helpers_sourced:-1} = "1" ]; then
#    readonly git_helpers_sourced=${BASH_SOURCE[0]}
#else
#    return 0
#fi

exec_opkg_command () {
    local func="${FUNCNAME[0]}"
    
    log_debug "$func:${LINENO} exec-ing [$*]"

    exec {fd}< <(eval "$@")
    local ps_pid=$!             # remember pid of process substitution

    local opkg_result=""
    while read tmp <&$fd; do
        if ! [ -z "$tmp" ]; then
            opkg_result="${opkg_result}$tmp"
        fi
    done
        
    exec {fd}>&-                # close fd (i.e. process substitution)
    wait $ps_pid                # wait for the subshell to finish

    printf '%s' "$opkg_result"
}

# Fetch/merge updates from predefined repository using git.
# 
fetch_customer_updates() {
    local func="${FUNCNAME[0]}"
    if ! pull_customer_repository $1; then
        return 1
    fi
    return 0
}

# Check if the fetched/merged files have the correct md5 and are
# valid for the PSA.
#
check_md5_for_changed_customer_files () {
    local func="${FUNCNAME[0]}"
    #for file in ($1); do
        # Check the updates for correct MD5
        # log_error "$func:${LINENO}: new customer files wrong"
        #    revert_customer_repository ; exit 1
        # fi
    #done
    return 0
}

check_md5_for_opkg_packages () {
    local func="${FUNCNAME[0]}"
    local -n opkg_output_ref=$1
    local package=""
    local md5sum=""
    local filename=""
    for line in ${opkg_output_ref[@]}; do
        if grep -qE "^\s*Package\s*:.*?$" <<< "$line"; then
            package=${line#*:* }
            printf 'package=%s\n' "$package"
        elif grep -qE "^\s*MD5Sum\s*:.*?$" <<< "$line"; then
            md5sum=${line#*:* }
            printf 'md5sum=%s\n' "$md5sum"
        elif grep -qE "^\s*Filename\s*:.*?$" <<< "$line"; then
            filename=${line#*:* }
            printf 'filename=%s\n' "$filename"
        fi
    done

    log_debug "$func:${LINENO}: $package | $md5sum | $filename"
    return 0
}

# In case the new checked-out files are not correct, revert the git
# repository to its previous state.
#
revert_customer_repository() {
    local func="${FUNCNAME[0]}"
    return 0
}

# Backup before the update-process. 
#
backup_previous_version () {
    local func="${FUNCNAME[0]}"
    return 0
}

exec_opkg_info () {
    local func="${FUNCNAME[0]}"
    log_info "$func:${LINENO}: executing $opkg_command"
    
    opkg_result=$(exec_opkg_command "opkg info $1")
    
    # make sure the keywords start with '\n'
    opkg_result=$(sed -E -e "s/(^.*)(Package)(.*$)/\n\2\3/g"\
              -e "s/(^.*)(Version)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Depends)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Status)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Architecture)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Maintainer)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(MD5Sum)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Filename)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Source)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Description)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Installed-Size)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Section)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*[^-])(Size)(.*$)/\1\n\2\3/g"\
              -e "s/(^.*)(Installed-Time)(.*$)/\1\n\2\3/g" <<< "$opkg_result")

    local -n output_ref=$2

    readarray -d $'\n' output_ref < <(printf '%s' "$opkg_result")
    if [ $? -ne 0 ]; then
        log_error "$func:${LINENO}: readarray finished with error"
        return 1
    fi
    
    log_info "$func:${LINENO}: ... done"
    log_info "$func:${LINENO}: opkg_result=${output_ref[@]}"
    return 0
}

# Try to install new opkg-packages (in case the are some
# in the new git-checkout).
#
exec_opkg_no_action() {
    local func="${FUNCNAME[0]}"
    local opkg_command_no_action="opkg --noaction $1"
    log_info "$func:${LINENO}: executing $opkg_command_no_action"
    return 0
}

# Install the new packages using opkg. 
#
exec_opkg () {
    local func="${FUNCNAME[0]}"
    log_info "$func:${LINENO}: executing $opkg_command"
    
    local opkg_result=$(exec_opkg_command "opkg $1")

    return 0
}

# In case there was some error, re-install the previous package(s)
# and use the backup to restore any conf/ini-files.
#
fallback_to_previous_version() {
    local func="${FUNCNAME[0]}"
    return 0;
}

# If all went well, then execute all necessary cleanup steps.
#
cleanup_previous_version() {
    local func="${FUNCNAME[0]}"
    return 0
}