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#!/bin/sh
#
# Cross-compiles utilities needed for git-annex on Android,
# and builds the Android app.

set -e

androidversion=$1
if [ -z "$androidversion" ]; then
	echo "need android version (4 or 5) as parameter" >&2
	exit 1
fi

VER="$(perl -e '$_=<>;print m/\((.*?)\)/'<../../CHANGELOG)"

wrap () {
	sed -e "s!PROG!$1!" -e "s!OPTS!$3!" < wrapper.pl > "$2"
	chmod +x "$2"
}

# Add Android cross-compiler to PATH (as installed by ghc-android)
androidtoolchain="$HOME/.ghc/$(cat abiversion)/bin"
# For Android 5, use a wrapped version of the C compiler,
# which sets PIE build flags.
if [ "$androidversion" = 5 ]; then
	rm -rf "$androidtoolchain/5"
	mkdir -p "$androidtoolchain/5"
	for f in $(find "$androidtoolchain" -maxdepth 1 -not -type d -printf '%f\n'); do
		src="$androidtoolchain/$f"
		dest="$androidtoolchain/5/$f"
		case "$f" in
		*-ld*)
			wrap "$src" "$dest" "-pie"
		;;
		*-gcc)
			wrap "$src" "$dest" "-pie -fPIE"
		;;
		*'-g++')
			wrap "$src" "$dest" "-pie -fPIE"
		;;
		*)
			cp -a "$src" "$dest"
		;;
		esac
	done
	PATH="$androidtoolchain/5:$PATH"
else
	PATH="$androidtoolchain:$PATH"
fi
export PATH

# Paths to the Android SDK and NDK.
export ANDROID_SDK_ROOT="$HOME/.android/adt-bundle-linux-x86/sdk"
export ANDROID_NDK_ROOT="$HOME/.android/android-ndk"

GIT_ANNEX_ANDROID_SOURCETREE="$HOME/.android/git-annex-sourcetree"
export GIT_ANNEX_ANDROID_SOURCETREE
if [ ! -e "$GIT_ANNEX_ANDROID_SOURCETREE" ]; then
	make source
fi
src="$GIT_ANNEX_ANDROID_SOURCETREE-$androidversion"
if [ ! -e "$src" ] ; then
	cp -a "$GIT_ANNEX_ANDROID_SOURCETREE" "$src"
fi
GIT_ANNEX_ANDROID_SOURCETREE="$src"
export GIT_ANNEX_ANDROID_SOURCETREE

gittree="$GIT_ANNEX_ANDROID_SOURCETREE/git/installed-tree"

make "$GIT_ANNEX_ANDROID_SOURCETREE/openssl/build-stamp"
make "$GIT_ANNEX_ANDROID_SOURCETREE/openssh/build-stamp"
make "$GIT_ANNEX_ANDROID_SOURCETREE/busybox/build-stamp"
make "$GIT_ANNEX_ANDROID_SOURCETREE/rsync/build-stamp"
make "$GIT_ANNEX_ANDROID_SOURCETREE/gnupg/build-stamp"
make "$GIT_ANNEX_ANDROID_SOURCETREE/git/build-stamp"
make "$GIT_ANNEX_ANDROID_SOURCETREE/term/build-stamp"

perl -i -pe 's/(android:versionName=)"[^"]+"/$1"'"$VER"'"/' \
	"$GIT_ANNEX_ANDROID_SOURCETREE/term/AndroidManifest.xml"

# Debug build because it does not need signing keys.
(cd "$GIT_ANNEX_ANDROID_SOURCETREE/term" && tools/build-debug)

# Install executables as pseudo-libraries so they will be
# unpacked from the .apk.
mkdir -p "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/busybox/busybox" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.busybox.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/openssh/ssh" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.ssh.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/openssh/ssh-keygen" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.ssh-keygen.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/rsync/rsync" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.rsync.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/gnupg/g10/gpg" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.gpg.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/git/git" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.git.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/git/git-shell" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.git-shell.so"
cp "$GIT_ANNEX_ANDROID_SOURCETREE/git/git-upload-pack" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.git-upload-pack.so"
arm-linux-androideabi-strip --strip-unneeded --remove-section=.comment --remove-section=.note "$GIT_ANNEX_ANDROID_SOURCETREE"/term/libs/armeabi/*
cp runshell "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.runshell.so"
cc start.c -o "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.start.so"

# remove git stuff we don't need to save space
rm -rf $gittree/bin/git-cvsserver \
	$gittree/libexec/git-core/git-daemon \
	$gittree/libexec/git-core/git-show-index \
	$gittree/libexec/git-core/mergetools \
	$gittree/libexec/git-core/git-credential-* \
	$gittree/libexec/git-core/git-cvsserver \
	$gittree/libexec/git-core/git-cvsimport \
	$gittree/libexec/git-core/git-fast-import \
	$gittree/libexec/git-core/git-http-backend \
	$gittree/libexec/git-core/git-imap-send \
	$gittree/libexec/git-core/git-instaweb \
	$gittree/libexec/git-core/git-p4 \
	$gittree/libexec/git-core/git-remote-test* \
	$gittree/libexec/git-core/git-submodule \
	$gittree/libexec/git-core/git-svn \
	$gittree/libexec/git-core/git-web--browse

# Most of git is in one multicall binary, but a few important
# commands are still shell scripts. Those are put into
# a tarball, along with a list of all the links that should be
# set up.
(cd $gittree && mkdir -p links)
(cd $gittree && find -samefile bin/git -not -wholename ./bin/git > links/git)
(cd $gittree && find -samefile bin/git-shell -not -wholename ./bin/git-shell > links/git-shell)
(cd $gittree && find -samefile bin/git-upload-pack -not -wholename ./bin/git-upload-pack > links/git-upload-pack)
(cd $gittree && find -type f -not -samefile bin/git -not -samefile bin/git-shell -not -samefile bin/git-upload-pack | tar czf ../git.tar.gz -T -)
(cp "$GIT_ANNEX_ANDROID_SOURCETREE/git/git.tar.gz" "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.git.tar.gz.so")

git rev-parse HEAD > "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.version.so"
cp ../trustedkeys.gpg "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.trustedkeys.so"

genapk () {
	mkdir -p ../../tmp/$1; \
	cp ../../tmp/androidtree/dist/build/git-annex/$1/git-annex "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.git-annex.so"
	arm-linux-androideabi-strip --strip-unneeded --remove-section=.comment --remove-section=.note "$GIT_ANNEX_ANDROID_SOURCETREE/term/libs/armeabi/lib.git-annex.so"
	(cd "$GIT_ANNEX_ANDROID_SOURCETREE/term" && ant debug)
	cp "$GIT_ANNEX_ANDROID_SOURCETREE/term/bin/Term-debug.apk" ../../tmp/$1/git-annex.apk
}

if [ "$androidversion" = 4 ]; then
	for v in 4.0 4.3; do
		genapk $v
	done
else
	genapk 5.0
fi