Add musl/alpine packs (#429)

## What?
* Adds runtime/apphost packs for musl/alpine
* Makes the apphost/runtime transitions handle rids that only have packs for child rids

dotnet/private/common.bzl

@@ -383,6 +383,28 @@ def get_highest_compatible_target_framework(incoming_tfm, tfms):
 
     return None
 
+def get_highest_compatible_runtime_identifier(incoming_rid, rids):
+    """Returns the highest compatible runtime identifier for the incoming_rid.
+
+    Args:
+      incoming_rid: The runtime identifier to compare to
+      rids: A list of runtime identifiers to choose from
+    Returns:
+        The highest compatible runtime identifier
+    """
+    if incoming_rid in rids:
+        return incoming_rid
+
+    compatible_rids = RUNTIME_GRAPH.get(incoming_rid)
+    if compatible_rids == None:
+        return None
+
+    for compatible_rid in compatible_rids:
+        if compatible_rid in rids:
+            return compatible_rid
+
+    return None
+
 def get_nuget_relative_path(file):
     """Returns NuGet package relative path of a file that is part of a NuGet package
 

dotnet/private/sdk/apphost_packs/apphost_pack_lookup_table.bzl

@@ -4,27 +4,35 @@ apphost_pack_lookup_table = {
     "netcoreapp3.0": {
         "linux-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_linux-x64",
         "linux-arm64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_linux-arm64",
+        "linux-musl-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_linux-musl-x64",
+        "linux-musl-arm64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_linux-musl-arm64",
         "osx-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_osx-x64",
         "win-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_win-x64",
         "win-arm64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.0_win-arm64",
     },
     "netcoreapp3.1": {
         "linux-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_linux-x64",
         "linux-arm64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_linux-arm64",
+        "linux-musl-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_linux-musl-x64",
+        "linux-musl-arm64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_linux-musl-arm64",
         "osx-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_osx-x64",
         "win-x64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_win-x64",
         "win-arm64": "//dotnet/private/sdk/apphost_packs:netcoreapp3.1_win-arm64",
     },
     "net5.0": {
         "linux-x64": "//dotnet/private/sdk/apphost_packs:net5.0_linux-x64",
         "linux-arm64": "//dotnet/private/sdk/apphost_packs:net5.0_linux-arm64",
+        "linux-musl-x64": "//dotnet/private/sdk/apphost_packs:net5.0_linux-musl-x64",
+        "linux-musl-arm64": "//dotnet/private/sdk/apphost_packs:net5.0_linux-musl-arm64",
         "osx-x64": "//dotnet/private/sdk/apphost_packs:net5.0_osx-x64",
         "win-x64": "//dotnet/private/sdk/apphost_packs:net5.0_win-x64",
         "win-arm64": "//dotnet/private/sdk/apphost_packs:net5.0_win-arm64",
     },
     "net6.0": {
         "linux-x64": "//dotnet/private/sdk/apphost_packs:net6.0_linux-x64",
         "linux-arm64": "//dotnet/private/sdk/apphost_packs:net6.0_linux-arm64",
+        "linux-musl-x64": "//dotnet/private/sdk/apphost_packs:net6.0_linux-musl-x64",
+        "linux-musl-arm64": "//dotnet/private/sdk/apphost_packs:net6.0_linux-musl-arm64",
         "osx-x64": "//dotnet/private/sdk/apphost_packs:net6.0_osx-x64",
         "osx-arm64": "//dotnet/private/sdk/apphost_packs:net6.0_osx-arm64",
         "win-x64": "//dotnet/private/sdk/apphost_packs:net6.0_win-x64",
@@ -33,6 +41,8 @@ apphost_pack_lookup_table = {
     "net7.0": {
         "linux-x64": "//dotnet/private/sdk/apphost_packs:net7.0_linux-x64",
         "linux-arm64": "//dotnet/private/sdk/apphost_packs:net7.0_linux-arm64",
+        "linux-musl-x64": "//dotnet/private/sdk/apphost_packs:net7.0_linux-musl-x64",
+        "linux-musl-arm64": "//dotnet/private/sdk/apphost_packs:net7.0_linux-musl-arm64",
         "osx-x64": "//dotnet/private/sdk/apphost_packs:net7.0_osx-x64",
         "osx-arm64": "//dotnet/private/sdk/apphost_packs:net7.0_osx-arm64",
         "win-x64": "//dotnet/private/sdk/apphost_packs:net7.0_win-x64",
@@ -41,6 +51,8 @@ apphost_pack_lookup_table = {
     "net8.0": {
         "linux-x64": "//dotnet/private/sdk/apphost_packs:net8.0_linux-x64",
         "linux-arm64": "//dotnet/private/sdk/apphost_packs:net8.0_linux-arm64",
+        "linux-musl-x64": "//dotnet/private/sdk/apphost_packs:net8.0_linux-musl-x64",
+        "linux-musl-arm64": "//dotnet/private/sdk/apphost_packs:net8.0_linux-musl-arm64",
         "osx-x64": "//dotnet/private/sdk/apphost_packs:net8.0_osx-x64",
         "osx-arm64": "//dotnet/private/sdk/apphost_packs:net8.0_osx-arm64",
         "win-x64": "//dotnet/private/sdk/apphost_packs:net8.0_win-x64",

dotnet/private/sdk/apphost_packs/apphost_pack_transition.bzl

@@ -1,14 +1,16 @@
 "A transition that transitions between compatible target frameworks"
 
+load("//dotnet/private:common.bzl", "get_highest_compatible_runtime_identifier")
 load(":apphost_pack_lookup_table.bzl", "apphost_pack_lookup_table")
 
 def _impl(settings, _attr):
     incoming_target_framework = settings["//dotnet:target_framework"]
     incoming_rid = settings["//dotnet:rid"]
 
     supported_rids = apphost_pack_lookup_table.get(incoming_target_framework)
+    highest_compatible_rid = get_highest_compatible_runtime_identifier(incoming_rid, supported_rids.keys())
     if supported_rids:
-        apphost_pack = supported_rids.get(incoming_rid)
+        apphost_pack = supported_rids.get(highest_compatible_rid)
         if apphost_pack:
             return {"//dotnet/private/sdk/apphost_packs:apphost_pack": apphost_pack}
 

dotnet/private/sdk/apphost_packs/apphost_packs.bzl

@@ -8,33 +8,45 @@ def apphost_packs():
 
     apphost_pack(name = "netcoreapp3.0_linux-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-x64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "linux-x64")
     apphost_pack(name = "netcoreapp3.0_linux-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-arm64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "linux-arm64")
+    apphost_pack(name = "netcoreapp3.0_linux-musl-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-x64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "linux-musl-x64")
+    apphost_pack(name = "netcoreapp3.0_linux-musl-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-arm64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "linux-musl-arm64")
     apphost_pack(name = "netcoreapp3.0_osx-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-x64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "osx-x64")
     apphost_pack(name = "netcoreapp3.0_win-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-x64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "win-x64")
     apphost_pack(name = "netcoreapp3.0_win-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-arm64.v3.0.3", target_framework = "netcoreapp3.0", runtime_identifier = "win-arm64")
     apphost_pack(name = "netcoreapp3.1_linux-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-x64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "linux-x64")
     apphost_pack(name = "netcoreapp3.1_linux-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-arm64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "linux-arm64")
+    apphost_pack(name = "netcoreapp3.1_linux-musl-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-x64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "linux-musl-x64")
+    apphost_pack(name = "netcoreapp3.1_linux-musl-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-arm64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "linux-musl-arm64")
     apphost_pack(name = "netcoreapp3.1_osx-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-x64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "osx-x64")
     apphost_pack(name = "netcoreapp3.1_win-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-x64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "win-x64")
     apphost_pack(name = "netcoreapp3.1_win-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-arm64.v3.1.32", target_framework = "netcoreapp3.1", runtime_identifier = "win-arm64")
     apphost_pack(name = "net5.0_linux-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-x64.v5.0.17", target_framework = "net5.0", runtime_identifier = "linux-x64")
     apphost_pack(name = "net5.0_linux-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-arm64.v5.0.17", target_framework = "net5.0", runtime_identifier = "linux-arm64")
+    apphost_pack(name = "net5.0_linux-musl-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-x64.v5.0.17", target_framework = "net5.0", runtime_identifier = "linux-musl-x64")
+    apphost_pack(name = "net5.0_linux-musl-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-arm64.v5.0.17", target_framework = "net5.0", runtime_identifier = "linux-musl-arm64")
     apphost_pack(name = "net5.0_osx-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-x64.v5.0.17", target_framework = "net5.0", runtime_identifier = "osx-x64")
     apphost_pack(name = "net5.0_win-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-x64.v5.0.17", target_framework = "net5.0", runtime_identifier = "win-x64")
     apphost_pack(name = "net5.0_win-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-arm64.v5.0.17", target_framework = "net5.0", runtime_identifier = "win-arm64")
     apphost_pack(name = "net6.0_linux-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-x64.v6.0.28", target_framework = "net6.0", runtime_identifier = "linux-x64")
     apphost_pack(name = "net6.0_linux-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-arm64.v6.0.28", target_framework = "net6.0", runtime_identifier = "linux-arm64")
+    apphost_pack(name = "net6.0_linux-musl-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-x64.v6.0.28", target_framework = "net6.0", runtime_identifier = "linux-musl-x64")
+    apphost_pack(name = "net6.0_linux-musl-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-arm64.v6.0.28", target_framework = "net6.0", runtime_identifier = "linux-musl-arm64")
     apphost_pack(name = "net6.0_osx-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-x64.v6.0.28", target_framework = "net6.0", runtime_identifier = "osx-x64")
     apphost_pack(name = "net6.0_osx-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-arm64.v6.0.28", target_framework = "net6.0", runtime_identifier = "osx-arm64")
     apphost_pack(name = "net6.0_win-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-x64.v6.0.28", target_framework = "net6.0", runtime_identifier = "win-x64")
     apphost_pack(name = "net6.0_win-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-arm64.v6.0.28", target_framework = "net6.0", runtime_identifier = "win-arm64")
     apphost_pack(name = "net7.0_linux-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-x64.v7.0.17", target_framework = "net7.0", runtime_identifier = "linux-x64")
     apphost_pack(name = "net7.0_linux-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-arm64.v7.0.17", target_framework = "net7.0", runtime_identifier = "linux-arm64")
+    apphost_pack(name = "net7.0_linux-musl-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-x64.v7.0.17", target_framework = "net7.0", runtime_identifier = "linux-musl-x64")
+    apphost_pack(name = "net7.0_linux-musl-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-arm64.v7.0.17", target_framework = "net7.0", runtime_identifier = "linux-musl-arm64")
     apphost_pack(name = "net7.0_osx-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-x64.v7.0.17", target_framework = "net7.0", runtime_identifier = "osx-x64")
     apphost_pack(name = "net7.0_osx-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-arm64.v7.0.17", target_framework = "net7.0", runtime_identifier = "osx-arm64")
     apphost_pack(name = "net7.0_win-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-x64.v7.0.17", target_framework = "net7.0", runtime_identifier = "win-x64")
     apphost_pack(name = "net7.0_win-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-arm64.v7.0.17", target_framework = "net7.0", runtime_identifier = "win-arm64")
     apphost_pack(name = "net8.0_linux-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-x64.v8.0.3", target_framework = "net8.0", runtime_identifier = "linux-x64")
     apphost_pack(name = "net8.0_linux-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-arm64.v8.0.3", target_framework = "net8.0", runtime_identifier = "linux-arm64")
+    apphost_pack(name = "net8.0_linux-musl-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-x64.v8.0.3", target_framework = "net8.0", runtime_identifier = "linux-musl-x64")
+    apphost_pack(name = "net8.0_linux-musl-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.linux-musl-arm64.v8.0.3", target_framework = "net8.0", runtime_identifier = "linux-musl-arm64")
     apphost_pack(name = "net8.0_osx-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-x64.v8.0.3", target_framework = "net8.0", runtime_identifier = "osx-x64")
     apphost_pack(name = "net8.0_osx-arm64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.osx-arm64.v8.0.3", target_framework = "net8.0", runtime_identifier = "osx-arm64")
     apphost_pack(name = "net8.0_win-x64", pack = "@dotnet.apphost_packs//microsoft.netcore.app.host.win-x64.v8.0.3", target_framework = "net8.0", runtime_identifier = "win-x64")