Caching and fetching Android NDK and SDK?

Environments
1

Hi Everyone,

I have a few projects that test on Android. There are four recipes covering armv7a, aarch64, x86 and x86_64. That means I have to fetch the Android SDK and NDK four times.

I noticed if the SDK and NDK fetches occur around the same time, then the Google server throttles the requests and I get intermittent NDK download failures.

My question is, does Travis provide a cached copy of the download somewhere? If so, where is it?

For completeness, here is what the recipe looks like when preparing the Android environment. It is run four times during Travis testing.

#!/usr/bin/env bash

if [ -z "$ANDROID_SDK_ROOT" ]; then
    echo "ERROR: ANDROID_SDK_ROOT is not set. Please set it."
    echo "SDK root is $ANDROID_SDK_ROOT"
    exit 1
fi

if [ -z "$ANDROID_NDK_ROOT" ]; then
    echo "ERROR: ANDROID_NDK_ROOT is not set. Please set it."
    echo "NDK root is $ANDROID_NDK_ROOT"
    exit 1
fi

echo "Using ANDROID_SDK_ROOT: $ANDROID_SDK_ROOT"
echo "Using ANDROID_NDK_ROOT: $ANDROID_NDK_ROOT"

echo "Downloading SDK"
if ! curl -k -s -o "$HOME/android-sdk.zip" https://dl.google.com/android/repository/commandlinetools-linux-6200805_latest.zip;
then
    echo "Failed to download SDK"
    exit 1
fi

echo "Downloading NDK"
if ! curl -k -s -o "$HOME/android-ndk.zip" https://dl.google.com/android/repository/android-ndk-r20b-linux-x86_64.zip;
then
    echo "Failed to download NDK"
    exit 1
fi

echo "Unpacking SDK to $ANDROID_SDK_ROOT"
if ! unzip -qq "$HOME/android-sdk.zip" -d "$ANDROID_SDK_ROOT";
then
    echo "Failed to unpack SDK"
    exit 1
fi

echo "Unpacking NDK to $ANDROID_NDK_ROOT"
if ! unzip -qq "$HOME/android-ndk.zip" -d "$HOME";
then
    echo "Failed to unpack NDK"
    exit 1
fi

if ! mv "$HOME/android-ndk-r20b" "$ANDROID_NDK_ROOT";
then
    echo "Failed to move $HOME/android-ndk-r20b to $ANDROID_NDK_ROOT"
    exit 1
fi

rm -f "$HOME/android-sdk.zip"
rm -f "$HOME/android-ndk.zip"

# https://stackoverflow.com/a/47028911/608639
touch "$ANDROID_SDK_ROOT/repositories.cfg"

echo "Finished installing SDK and NDK"

exit 0