[PATCH v4 03/13] sdk: Add script to relocate SDK

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

When run inside the unpacked SDK, this script tunes interp and rpath
entry in relevant binaries so that the cross conpilation tool can be
called outside of the chroot, irrespective of the host distribution.
Then only "--sysroot /path/to/sdkroot" needs to be passed to the
compiler.

The script also supports restoring the original chroot-mode when invoked
with the --restore-chroot option.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 .../sdkchroot/files/relocate-sdk.sh           | 41 +++++++++++++++++++
 meta/recipes-devtools/sdkchroot/sdkchroot.bb  |  2 +
 2 files changed, 43 insertions(+)
 create mode 100755 meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh

diff --git a/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh b/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh
new file mode 100755
index 00000000..1c9b02fa
--- /dev/null
+++ b/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh
@@ -0,0 +1,41 @@
+#!/bin/sh
+#
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2020
+#
+# SPDX-License-Identifier: MIT
+
+sdkroot=$(realpath $(dirname $0))
+arch=$(uname -m)
+
+new_sdkroot=$sdkroot
+
+case "$1" in
+--help|-h)
+	echo "Usage: $0 [--restore-chroot|-r]"
+	exit 0
+	;;
+--restore-chroot|-r)
+	new_sdkroot=/
+	;;
+esac
+
+if [ -z $(which patchelf 2>/dev/null) ]; then
+	echo "Please install 'patchelf' package first."
+	exit 1
+fi
+
+echo -n "Adjusting path of SDK to '${new_sdkroot}'... "
+
+for binary in $(find ${sdkroot}/usr/bin ${sdkroot}/usr/sbin ${sdkroot}/usr/lib/gcc* -executable -type f); do
+	interpreter=$(patchelf --print-interpreter ${binary} 2>/dev/null)
+	oldpath=${interpreter%/lib*/ld-linux*}
+	interpreter=${interpreter#${oldpath}}
+	if [ -n "${interpreter}" ]; then
+		patchelf --set-interpreter ${new_sdkroot}${interpreter} \
+			--set-rpath ${new_sdkroot}/usr/lib:${new_sdkroot}/usr/lib/${arch}-linux-gnu \
+			$binary 2>/dev/null
+	fi
+done
+
+echo "done"
diff --git a/meta/recipes-devtools/sdkchroot/sdkchroot.bb b/meta/recipes-devtools/sdkchroot/sdkchroot.bb
index 05320a03..5fba09c3 100644
--- a/meta/recipes-devtools/sdkchroot/sdkchroot.bb
+++ b/meta/recipes-devtools/sdkchroot/sdkchroot.bb
@@ -10,6 +10,7 @@ LIC_FILES_CHKSUM = "file://${LAYERDIR_core}/licenses/COPYING.GPLv2;md5=751419260
 
 SRC_URI = " \
     file://configscript.sh \
+    file://relocate-sdk.sh \
     file://README.sdk"
 PV = "0.1"
 
@@ -59,6 +60,7 @@ ROOTFS_POSTPROCESS_COMMAND =+ "sdkchroot_install_files"
 sdkchroot_install_files() {
     # Configure root filesystem
     sudo install -m 644 ${WORKDIR}/README.sdk ${S}
+    sudo install -m 755 ${WORKDIR}/relocate-sdk.sh ${S}
     sudo install -m 755 ${WORKDIR}/configscript.sh ${S}
     sudo chroot ${S} /configscript.sh  ${DISTRO_ARCH}
 }
-- 
2.26.2