First steps for generating nuget packages for ARM64/Android. (#10286)

* First steps for generating nuget packages for ARM64/Android. Adds Android RIDS and related conditionals to appropriate files

* Additional changes for Android package build

* Revert addition of Android to supported packages

* Allow Android .nuget package build

Adding runtime.Android files for package generation
Adding TODO for reliable generation of __DistroRid for Android

* Added/corrected logic for detecting __DistroRid at commandline
Removed hack and TODO

* Removed newline

* Revert unintentional change to osx rid

* Removed commenting of __DistroRid initialization

* Latest fixes for __DistroRid cmdline detection

Removed __DistroRid initialization (clobbers value set at cmdline)
Removed echo test of __DistroRid in generate nuget pkg function
(Hopefully) fixed cross-build os-release detection

* Removed android.21-arm from supported RIDs

Removed arm32 from supported RIDs until test build can be done or CI for arm32 added (?)

* Fixes for package generation for android

Modified build-android-rootfs.sh so it would generate file w/platform info
Reverted all prior changes to initTargetDistroRid, added new android platform detection

* Fixed conditional for Android

* Added platform generation for Android portable build, if ever needed

* Added information about android_platform

Added help info about android_platform file
Added TODO for dynamic generation of RID based on $__ApiLevel and $__BuildArch

* Syntax cleanup for build.sh

Removed extra space in initTargetDistroRid() logic

* Recommended review changes

removed Android-specific runtime files for packaging
added conditional to have Android use Linux runtime files

* Updated topic branch from master, resolving SPC.ni.dll file nuget pkg issue

* ericstj review changes

Fixed accidental fedora version change
Fixed indenting

* Removed TODO comment; logic already in place, added in earlier commit

* Removed Android OfficialBuildRID

1 files changed, 4 insertions, 0 deletions

diff --git a/cross/build-android-rootfs.sh b/cross/build-android-rootfs.sh
index 703083764c..636618c864 100755
--- a/cross/build-android-rootfs.sh
+++ b/cross/build-android-rootfs.sh
@@ -15,6 +15,7 @@ usage()
     echo.
     echo "By default, the NDK will be downloaded into the cross/android-rootfs/android-ndk-$__NDK_Version directory. If you already have an NDK installation,"
     echo "you can set the NDK_DIR environment variable to have this script use that installation of the NDK."
+    echo "By default, this script will generate a file, android_platform, in the root of the ROOTFS_DIR directory that contains the RID for the supported and tested Android build: android.21-arm64. This file is to replace '/etc/os-release', which is not available for Android."
     exit 1
 }
 
@@ -136,7 +137,10 @@ dpkg -x $__Android_Cross_Dir/deb/libunwind_1.2.20170304_$__AndroidArch.deb $__An
 
 cp -R $__Android_Cross_Dir/tmp/$__AndroidArch/data/data/com.termux/files/usr/* $__ToolchainDir/sysroot/usr/
 
+# Generate platform file for build.sh script to assign to __DistroRid
+echo "Generating platform file..."
 
+echo "RID=android.21-arm64" > $__ToolchainDir/sysroot/android_platform
 echo Now run:
 echo CONFIG_DIR=\`realpath cross/android/$__BuildArch\` ROOTFS_DIR=\`realpath $__ToolchainDir/sysroot\` ./build.sh cross $__BuildArch skipgenerateversion skipnuget cmakeargs -DENABLE_LLDBPLUGIN=0