iOS: use recommended variable for bundle ID

We used to hard-code the bundle ID which meant that developers always had to
manually override the bundle ID in order to be able to sign the iOS app for
local testing.  With this change, the official builds will continue to work
without manually opening the project in Xcode, yet other developers will use
the Apple-recommended format in order to set their own bundle ID.

This is based on a suggestion by Murillo Bernardes.

See #1246

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

packaging/ios/Info.plist.in

@@ -11,7 +11,7 @@
 	<key>CFBundleIconName</key>
 	<string>AppIcon</string>
 	<key>CFBundleIdentifier</key>
-	<string>org.subsurface-divelog.subsurface-mobile</string>
+	<string>@PRODUCT_BUNDLE_IDENTIFIER@</string>
 	<key>CFBundleName</key>
 	<string>Subsurface-mobile</string>
 	<key>CFBundlePackageType</key>

packaging/ios/build.sh

@@ -4,6 +4,7 @@
 set -x
 set -e
 
+PRODUCT_BUNDLE_IDENTIFIER="\$(PRODUCT_BUNDLE_IDENTIFIER)"
 DEBUGRELEASE="Release"
 DRCONFIG="release"
 ARCHS="armv7 arm64 x86_64"
@@ -13,6 +14,12 @@ TARGET2="Device"
 while [[ $# -gt 0 ]] ; do
 	arg="$1"
 	case $arg in
+		-official)
+			# build an app identified as org.subsurface-divelog.subsurface-mobile
+			# without having to set this explicitly in Xcode (this way this works,
+			# e.g., in Travis)
+			PRODUCT_BUNDLE_IDENTIFIER="org.subsurface-divelog.subsurface-mobile"
+			;;
 		-debug)
 			# build for debugging
 			DEBUGRELEASE="Debug"
@@ -80,7 +87,7 @@ echo "#define CANONICAL_VERSION_STRING \"$CANONICALVERSION\"" >> subsurface-mobi
 echo "#define MOBILE_VERSION_STRING \"$MOBILEVERSION\"" >> subsurface-mobile/ssrf-version.h
 
 # create Info.plist with the correct versions
-cat Info.plist.in | sed "s/@MOBILE_VERSION@/$MOBILEVERSION/;s/@CANONICAL_VERSION@/$CANONICALVERSION/" > Info.plist
+cat Info.plist.in | sed "s/@MOBILE_VERSION@/$MOBILEVERSION/;s/@CANONICAL_VERSION@/$CANONICALVERSION/;s/@PRODUCT_BUNDLE_IDENTIFIER@/$PRODUCT_BUNDLE_IDENTIFIER/" > Info.plist
 
 if [ "$1" = "version" ] ; then
 	exit 0

scripts/ios/travisbuild.sh

@@ -12,7 +12,7 @@ VERSION=$(echo $GITVERSION | sed -e 's/-/./')
 echo "preparing dependencies for Subsurface-mobile ${VERSION} for iOS"
 
 cd packaging/ios
-bash -x build.sh -simulator
+bash -x build.sh -simulator -official
 
 echo "now it's time to build Subsurface-mobile ${VERSION} for iOS"