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#!/bin/sh
#
# generate_core.sh extracts the core part from buildgcc script,
# most importantly the checksum calculation/verification functions.
#
# Copyright (C) 2019 Mike Banon <mikebdp2@gmail.com>
#
##############################################################################
#
# USAGE:
# ./generate_core.sh <buildgcc> <corescript> prepare_before_patch
# where
# buildgcc - path to input buildgcc script
# corescript - path to output core part script
# prepare_before_patch - optional argument to insert prepare_${package}
# call into the unpack_and_patch function, e.g.
# for removing some files with rm command
# in order to reduce the size of patch file
#
##############################################################################
buildgcc="$1"
corescript="$2"
prepare_before_patch="$3"
#
# Imports the source file fragment between start and end into the
# destination file, optionally excluding the last line if not needed
#
import_from_file() {
source="$1"
destination="$2"
start="$3"
end="$4"
last_line_disabled="$5"
if [ -z "${last_line_disabled}" ] ; then
sed -n "/^${start}/,/^${end}/{/^${start}/{p;n};{p}}" "$source" >> "$destination"
else
sed -n "/^${start}/,/^${end}/{/^${start}/{p;n};/^${end}/{q};{p}}" "$source" >> "$destination"
fi
}
#
# Import the color defines together with UNAME/HALT_FOR_TOOLS variables
#
import_from_file "$buildgcc" "$corescript" "red=" "HALT_FOR_TOOLS=0" || exit "$?"
#
# Import the core functions
#
FUNCTIONS="please_install searchtool download compute_hash error_hash_mismatch verify_hash unpack_and_patch"
for F in $FUNCTIONS ; do
import_from_file "$buildgcc" "$corescript" "$F()" "}" || exit "$?"
done
#
# Import a fragment where we find tar/patch/make and other essential tools
#
import_from_file "$buildgcc" "$corescript" "# Find all the required tools" "# Allow" "last_line_disabled" || exit "$?"
#
# Import a fragment with conditional exit if some required tools were not found
#
import_from_file "$buildgcc" "$corescript" "if \[ \"\$HALT_FOR_TOOLS" "fi" || exit "$?"
#
# Avoid the unnecessary subdirectories holding a single file each
#
sed -i -e "s/patches\///g" "$corescript"
sed -i -e "s/sum\///g" "$corescript"
sed -i -e "s/tarballs\///g" "$corescript"
sed -i -e "s/cd tarballs || exit 1//g" "$corescript"
sed -i -e "s/cd \.\.//g" "$corescript"
#
# Get the known checksum without using a dedicated single-line file
#
sed -i -e "s/\tknown_hash=\"\$(get_known_hash.*/\tknown_hash=\"\$2\"/g" "$corescript"
#
# Update the paths printed at the error messages
#
sed -i -e "s/util\/crossgcc\///g" "$corescript"
#
# Insert prepare_${package} function call between the unpack and patch operations
#
if [ ! -z "${prepare_before_patch}" ] ; then
sed -i -e "/\$TAR \$FLAGS \"\$(basename \"\$archive\")\"/a prepare_\${package} || exit \"\$?\"" "$corescript"
fi
#
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