fix: Determine remote-os build version from git

Use script directory to determine git version and git hash.
The output directory might be outside the git branch, e.g. in the Docker
build image.

This also fixes a build issue in #46 where the Docker build failed
calling `git rev-parse` in the wrong directory.

rpi0/git-version.sh

@@ -21,6 +21,7 @@ VERSION_FILE=$1
 DEF_VER=UNKNOWN
 LF='
 '
+cd $(dirname $0)
 
 if test -f "$VERSION_FILE"
 then
@@ -40,7 +41,6 @@ then
 	# BUILD_VERSION=$(echo "$BUILD_VERSION" | sed -e 's/-/./g');
 	:
 else
-    # TODO add version logic for develop and feature branches?
 	BUILD_VERSION="$DEF_VER"
 fi
 

rpi0/post-build.sh

@@ -12,29 +12,26 @@ if [ -e ${TARGET_DIR}/etc/inittab ]; then
 tty1::respawn:/sbin/getty -L  tty1 0 vt100 # HDMI console' ${TARGET_DIR}/etc/inittab
 fi
 
+echo "Creating systemd services"
 ln -fs ../../../../usr/lib/systemd/system/[email protected] $1/etc/systemd/system/multi-user.target.wants/[email protected]
-
 ln -fs ../../../../usr/lib/systemd/system/backlight.service $1/etc/systemd/system/multi-user.target.wants/backlight.service
-
 ln -fs ../../../../usr/lib/systemd/system/sharp-init.service $1/etc/systemd/system/multi-user.target.wants/sharp-init.service
-
 ln -fs ../../../../usr/lib/systemd/system/app.service $1/etc/systemd/system/multi-user.target.wants/app.service
 
 
 rm -rf $1/var/log/journal
 
 #rm -r $1/etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service
-
 #rm -r $1/etc/systemd/system/multi-user.target.wants/dhcpcd.service
 
 # Determine build version
 BUILD_VERSION=$("$SCRIPT_DIR/git-version.sh" "$BR2_EXTERNAL/version")
 
-# We need the Git hash of remote-os and not of the buildroot submodule!
-GIT_HASH=`cd $1; git rev-parse HEAD`
-
 echo "Setting build version in YIO env variable: $BUILD_VERSION"
 sed -i "s/\$BUILD_VERSION/$BUILD_VERSION/g" $1/etc/profile.d/yio.sh
 
+# We need the Git hash of remote-os and not of the buildroot submodule!
+GIT_HASH=`cd $SCRIPT_DIR; git rev-parse HEAD`
+
 echo "Setting Git hash in YIO env variable: $GIT_HASH"
 sed -i "s/\$GIT_HASH/$GIT_HASH/g" $1/etc/profile.d/yio.sh