Build Android targeting API 26 and test with API 24 system image.

Testing with API 24 images because there are no API 26 ARM images available.

I agree to license my contributions to each file under the terms given
at the top of each file I changed.

.travis.yml

@@ -4,7 +4,7 @@ cache:
     - $HOME/kcov-i686-unknown-linux-gnu
     - $HOME/kcov-x86_64-unknown-linux-gnu
     - $HOME/android/android-sdk-linux
-    - $HOME/android/android-18-arm-linux-androideabi-4.8
+    - $HOME/android/armv7a-linux-androideabi26
 matrix:
   fast_finish: true
   allow_failures:

README.md

@@ -215,8 +215,8 @@ the table below. The C compilers listed are used for compiling the C portions.
 </tr>
 <tr><td>Android</td>
     <td>32&#8209;bit&nbsp;ARM</td>
-    <td>Built using the Android SDK 24.4.1 and Android NDK 14, tested using the
-        Android emulator.</td>
+    <td>Built using the Android SDK 24.4.1 and Android NDK 17 targeting API level 26,
+        tested using the Android emulator on API levle 24 system images..</td>
 </tr>
 <tr><td>Mac&nbsp;OS&nbsp;X</td>
     <td>x64</td>

mk/travis-install-android.sh

@@ -28,8 +28,8 @@ ANDROID_NDK_VERSION=${ANDROID_NDK_VERSION:-17}
 ANDROID_NDK_URL=https://dl.google.com/android/repository/android-ndk-r${ANDROID_NDK_VERSION}-linux-x86_64.zip
 
 ANDROID_INSTALL_PREFIX="${HOME}/android"
-ANDROID_SDK_INSTALL_DIR="${HOME}/android/android-sdk-linux"
-ANDROID_NDK_INSTALL_DIR="${ANDROID_INSTALL_PREFIX}/android-18-arm-linux-androideabi-4.8"
+ANDROID_SDK_INSTALL_DIR="${ANDROID_INSTALL_PREFIX}/android-sdk-linux"
+ANDROID_NDK_INSTALL_DIR="${ANDROID_INSTALL_PREFIX}/armv7a-linux-androideabi26"
 
 if [[ ! -f $ANDROID_SDK_INSTALL_DIR/tools/emulator ]];then
   mkdir -p "${ANDROID_INSTALL_PREFIX}"
@@ -39,7 +39,7 @@ if [[ ! -f $ANDROID_SDK_INSTALL_DIR/tools/emulator ]];then
 
   expect -c '
 set timeout 600;
-spawn ./android-sdk-linux/tools/android update sdk -a --no-ui --filter tools,platform-tools,android-18,sys-img-armeabi-v7a-android-18;
+spawn ./android-sdk-linux/tools/android update sdk -a --no-ui --filter tools,platform-tools,android-24,sys-img-armeabi-v7a-android-24;
 expect {
     "Do you accept the license" { exp_send "y\r" ; exp_continue }
     eof
@@ -58,10 +58,11 @@ if [[ ! -d $ANDROID_NDK_INSTALL_DIR/sysroot/usr/include/arm-linux-androideabi ]]
   ./android-ndk-r${ANDROID_NDK_VERSION}/build/tools/make_standalone_toolchain.py \
 		 --force \
 		 --arch arm \
-		 --api 18 \
+		 --api 26 \
 		 --install-dir ${ANDROID_NDK_INSTALL_DIR}
 
   popd
+  rm -rf "${ANDROID_INSTALL_PREFIX}/downloads"
 fi
 
 echo end of mk/travis-install-android

mk/travis.sh

@@ -30,7 +30,7 @@ armv7-linux-androideabi)
   # install the android sdk/ndk
   mk/travis-install-android.sh
 
-  export PATH=$HOME/android/android-18-arm-linux-androideabi-4.8/bin:$PATH
+  export PATH=$HOME/android/armv7a-linux-androideabi26/bin:$PATH
   export PATH=$HOME/android/android-sdk-linux/platform-tools:$PATH
   export PATH=$HOME/android/android-sdk-linux/tools:$PATH
   ;;
@@ -94,9 +94,46 @@ fi
 case $TARGET_X in
 armv7-linux-androideabi)
   cargo test -vv -j2 --no-run ${mode-} ${FEATURES_X-} --target=$TARGET_X
-  # TODO: There used to be some logic for running the tests here using the
-  # Android emulator. That was removed because something broke this. See
-  # https://github.com/briansmith/ring/issues/603.
+
+  # Building the AVD is slow. Do it here, after we build the code so that any
+  # build breakage is reported sooner, instead of being delayed by this.
+  echo no | android create avd --name arm-24 --target android-24 --abi armeabi-v7a
+  android list avd
+
+  emulator @arm-24 -memory 2048 -no-skin -no-boot-anim -no-window &
+  adb wait-for-device
+  adb root
+  adb wait-for-device
+
+  # Run the unit tests first. The file named ring-<something> in $target_dir is
+  # the test executable.
+
+  find $target_dir -maxdepth 1 -name ring-* ! -name "*.*" \
+    -exec adb push {} /data/ring-test \;
+  for testfile in `find src crypto -name "*_test*.txt" -o -name "*test*.pk8"`; do
+    adb shell "mkdir -p /data/`dirname $testfile`"
+    adb push $testfile /data/$testfile
+  done
+  adb shell "mkdir -p /data/third_party/NIST"
+  adb push third_party/NIST/SHAVS /data/third_party/NIST/SHAVS
+  adb shell "cd /data && ./ring-test" 2>&1 | tee /tmp/ring-test-log
+  grep "test result: ok" /tmp/ring-test-log
+
+  # Run the integration/functional tests.
+  for testfile in `find tests -name "*_test*.txt" -o -name "*test*.pk8"`; do
+    adb shell "mkdir -p /data/`dirname $testfile`"
+    adb push $testfile /data/$testfile
+  done
+
+  for test_exe in `find $target_dir -maxdepth 1 -name "*test*" -type f ! -name "*.*" `; do
+      adb push $test_exe /data/`basename $test_exe`
+      adb shell "cd /data && ./`basename $test_exe`" 2>&1 | \
+          tee /tmp/`basename $test_exe`-log
+      grep "test result: ok" /tmp/`basename $test_exe`-log
+  done
+
+  adb emu kill
+
   ;;
 *)
   cargo test -vv -j2 ${mode-} ${FEATURES_X-} --target=$TARGET_X