build-package,termux_step_make_install: build .deb also on device

Do this using the termux-build-chroot script. Some tools are necessary
during `make install`. For an autoconf program these are typically
mkdir, sed, grep, install, and their paths are hardcoded into the
Makefil. Therefore symlink these into the new $PREFIX before running
`make install`, so that they can be found if necessary,

build-package.sh

@@ -6,12 +6,26 @@ set -e -o pipefail -u
 : "${TMPDIR:=/tmp}"
 export TMPDIR
 
+cd "$(realpath "$(dirname "$0")")"
+TERMUX_SCRIPTDIR=$(pwd)
+export TERMUX_SCRIPTDIR
+
+# Lock file to prevent parallel running in the same environment.
+TERMUX_BUILD_LOCK_FILE="${TMPDIR}/.termux-build.lck"
+if [ ! -e "$TERMUX_BUILD_LOCK_FILE" ]; then
+	touch "$TERMUX_BUILD_LOCK_FILE"
+fi
+
 if [ "$(uname -o)" = "Android" ] || [ -e "/system/bin/app_process" ]; then
 	if [ "$(id -u)" = "0" ]; then
 		echo "On-device execution of this script as root is disabled."
 		exit 1
 	fi
 
+	# termux-build-chroot sets up a new PREFIX with proot to which
+	# the built package can be installed without modifying $PREFIX
+	source "$TERMUX_SCRIPTDIR/scripts/termux-build-chroot.sh"
+
 	# This variable tells all parts of build system that build
 	# is performed on device.
 	export TERMUX_ON_DEVICE_BUILD=true
@@ -19,16 +33,6 @@ else
 	export TERMUX_ON_DEVICE_BUILD=false
 fi
 
-cd "$(realpath "$(dirname "$0")")"
-TERMUX_SCRIPTDIR=$(pwd)
-export TERMUX_SCRIPTDIR
-
-# Lock file to prevent parallel running in the same environment.
-TERMUX_BUILD_LOCK_FILE="${TMPDIR}/.termux-build.lck"
-if [ ! -e "$TERMUX_BUILD_LOCK_FILE" ]; then
-	touch "$TERMUX_BUILD_LOCK_FILE"
-fi
-
 # Special variable for internal use. It forces script to ignore
 # lock file.
 : "${TERMUX_BUILD_IGNORE_LOCK:=false}"
@@ -328,13 +332,16 @@ while (($# > 0)); do
 		cd "$TERMUX_PKG_BUILDDIR"
 		termux_step_make
 		cd "$TERMUX_PKG_BUILDDIR"
+		mkdir -p "$TERMUX_PKG_MASSAGEDIR/data"
 		termux_step_make_install
 		cd "$TERMUX_PKG_BUILDDIR"
 		termux_step_post_make_install
-                termux_step_install_service_scripts
+		termux_step_install_service_scripts
 		termux_step_install_license
-		cd "$TERMUX_PKG_MASSAGEDIR"
-		termux_step_extract_into_massagedir
+		if [ "$TERMUX_ON_DEVICE_BUILD" = "false" ]; then
+			cd "$TERMUX_PKG_MASSAGEDIR"
+			termux_step_extract_into_massagedir
+		fi
 		cd "$TERMUX_PKG_MASSAGEDIR"
 		termux_step_massage
 		cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"

scripts/build/termux_step_make_install.sh

@@ -1,19 +1,31 @@
 termux_step_make_install() {
+	if [ $TERMUX_ON_DEVICE_BUILD = "true" ]; then
+		CHROOT="termux-build-chroot"
+        	MAKE_INSTALL_TOOLS="sed grep mkdir install"
+		# We need to symlink some tools into our new prefix
+		for tool in $MAKE_INSTALL_TOOLS; do
+			mkdir -p $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX/bin
+			ln -s /usr/bin/$tool $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX/bin/
+		done
+	else
+		CHROOT=""
+	fi
 	[ "$TERMUX_PKG_METAPACKAGE" = "true" ] && return
 
 	if test -f build.ninja; then
-		ninja -w dupbuild=warn -j $TERMUX_MAKE_PROCESSES install
+		$CHROOT ninja -w dupbuild=warn -j $TERMUX_MAKE_PROCESSES install
 	elif ls ./*akefile &> /dev/null || [ -n "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
 		: "${TERMUX_PKG_MAKE_INSTALL_TARGET:="install"}"
 		# Some packages have problem with parallell install, and it does not buy much, so use -j 1.
+		echo "Running $CHROOT make -j 1 ${TERMUX_PKG_EXTRA_MAKE_ARGS} ${TERMUX_PKG_MAKE_INSTALL_TARGET}"
 		if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
-			make -j 1 ${TERMUX_PKG_MAKE_INSTALL_TARGET}
+			$CHROOT make -j 1 ${TERMUX_PKG_MAKE_INSTALL_TARGET}
 		else
-			make -j 1 ${TERMUX_PKG_EXTRA_MAKE_ARGS} ${TERMUX_PKG_MAKE_INSTALL_TARGET}
+			$CHROOT make -j 1 ${TERMUX_PKG_EXTRA_MAKE_ARGS} ${TERMUX_PKG_MAKE_INSTALL_TARGET}
 		fi
 	elif test -f Cargo.toml; then
 		termux_setup_rust
-		cargo install \
+		$CHROOT cargo install \
 			--jobs $TERMUX_MAKE_PROCESSES \
 			--path . \
 			--force \
@@ -21,6 +33,11 @@ termux_step_make_install() {
 			--root $TERMUX_PREFIX \
 			$TERMUX_PKG_EXTRA_CONFIGURE_ARGS
 		# https://github.com/rust-lang/cargo/issues/3316:
-		rm $TERMUX_PREFIX/.crates.toml
+		$CHROOT rm $TERMUX_PREFIX/.crates.toml
+	fi
+	if [ $TERMUX_ON_DEVICE_BUILD = "true" ]; then
+		for tool in $MAKE_INSTALL_TOOLS; do
+			unlink $TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX/bin/$tool
+		done
 	fi
 }