automated: android-test-lib: add adb_shell_which()

Change-Id: Ieec3d241a33c5d9a645a2e5ca2c1aeab96cc955d
Signed-off-by: Chase Qi <chase.qi@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/automated/lib/android-test-lib b/automated/lib/android-test-lib
index 3fe6831..8a11279 100755
--- a/automated/lib/android-test-lib
+++ b/automated/lib/android-test-lib
@@ -141,3 +141,17 @@ adb_pull() {
     info_msg "Pulling ${remote} from devcie ${ANDROID_SERIAL}"
     adb pull "${remote}" "${local}"
 }
+
+adb_shell_which() {
+    [ "$#" -ne 1 ] && error_msg "Usage: adb_shell_which <cmd>"
+    cmd="$1"
+    # Only latest version adb able to return exit code.
+    # Check if output of which is empty is a more reliable way.
+    which_output="$(adb shell "which ${cmd}")"
+    info_msg "Output of which: *${which_output}*"
+    if [ -n "${which_output}" ]; then
+        return 0
+    else
+        return 1
+    fi
+}