[Unix|*] Rework and share the logic for determining __DistroRid (#22628)

* [Unix|*] Rework and share the logic for determining __DistroRid

This will consolidate all of our different functions which determine
the __DistroRid into one file. In addition, it will remove the unused
__HostDistroRid file.

Lastly, it corrects the rid choice when crossbuilding musl-arm64 as the
cross-rootfs non-portable build will correctly be picked up.

* Fix typo and use __BuildArch in place of __Arch

* Correct non-portable build decision

* Add error for missing redhat-release

* Fix redhat comparison

* Correct previous rhel or

* Fix cross scenerio

* Fix missed $

* Set __RuntimeId for runtest.proj

* Correct naming convention of file

* Address feedback and support -portablebuild=0

With this change:

1. build.sh and build-test.sh should build portable by default.
2. init-distro-rid.sh checks __PortableBuild=1. If so, then it must force rhel 6 and freebsd to __PortableBuild=0 and use the non-portable build
    - For __PortableBuild=0 init-distro-rid.sh sets the non-portable rid correctly to "${ID}.${VERSION_ID}-${buildArch}"

* Correct arguments

* Fix if to include then

* A few more changes to correct linux-musl-arm64

* Add error for non-cross build and correctly pass ROOTFS_DIR

* Correctly exit instead of echo

* Correct isCrossBuild and use rootfsDir only

* Add documentation

* Address feedback

* Rework rhel if

1 files changed, 176 insertions, 0 deletions

diff --git a/init-distro-rid.sh b/init-distro-rid.sh
new file mode 100644
index 0000000000..ebf77fc42e
--- /dev/null
+++ b/init-distro-rid.sh
@@ -0,0 +1,176 @@
+#!/usr/bin/env bash
+
+# initNonPortableDistroRid
+#
+# Input:
+#   buildOs: (str)
+#   buildArch: (str)
+#   isPortable: (int)
+#   rootfsDir: (str)
+#
+# Return:
+#   None
+#
+# Notes:
+#
+# initNonPortableDistroRid will attempt to initialize a non portable rid. These
+# rids are specific to distros need to build the product/package and consume
+# them on the same platform.
+#
+# If -portablebuild=false is passed a non-portable rid will be created for any
+# distro.
+#
+# Below is the list of current non-portable platforms.
+#
+# Builds from the following *must* be non-portable:
+#
+#   |    OS     |           Expected RID            |
+#   -------------------------------------------------
+#   |   rhel6   |           rhel.6-x64              |
+#   |  alpine*  |        linux-musl-(arch)          |
+#   |  freeBSD  |        freebsd.(version)-x64      |
+#
+# It is important to note that the function does not return anything, but it 
+# will set __DistroRid if there is a non-portable distro rid to be used.
+#
+initNonPortableDistroRid()
+{
+    # Make sure out parameter is cleared.
+    __DistroRid=
+
+    local buildOs=$1
+    local buildArch=$2
+    local isPortable=$3
+    local rootfsDir=$4
+
+    if [ "$buildOs" = "Linux" ]; then
+        # RHEL 6 is the only distro we will check redHat release for.
+        if [ -e "${rootfsDir}/etc/os-release" ]; then
+            source "${rootfsDir}/etc/os-release"
+
+            # We have forced __PortableBuild=0. This is because -portablebuld
+            # has been passed as false.
+            if (( ${isPortable} == 0 )); then
+                if [ "${ID}" == "rhel" ]; then
+                    # remove the last version digit	
+                    VERSION_ID=${VERSION_ID%.*}
+                fi
+
+                nonPortableBuildID="${ID}.${VERSION_ID}-${buildArch}"
+            fi
+            
+        elif [ -e "${rootfsDir}/etc/redhat-release" ]; then
+            local redhatRelease=$(<${rootfsDir}/etc/redhat-release)
+
+            if [[ "${redhatRelease}" == "CentOS release 6."* || "$redhatRelease" == "Red Hat Enterprise Linux Server release 6."* ]]; then
+                nonPortableBuildID="rhel.6-${buildArch}"
+            fi
+        elif [ -e "${rootfsDir}/android_platform" ]; then
+            source $rootfsDir/android_platform
+            nonPortableBuildID="$RID"
+        fi
+    fi
+
+    if [ "$buildOs" = "FreeBSD" ]; then
+        __freebsd_version=`sysctl -n kern.osrelease | cut -f1 -d'.'`
+        nonPortableBuildID="freebsd.$__freebsd_version-${buildArch}"
+    fi
+
+    if [ "${nonPortableBuildID}" != "" ]; then
+        export __DistroRid=${nonPortableBuildID}
+
+        # We are using a non-portable build rid. Force __PortableBuild to false.
+        export __PortableBuild=0
+    fi
+}
+
+
+# initDistroRidGlobal
+#
+# Input:
+#   os: (str)
+#   arch: (str)
+#   isPortable: (int)
+#   rootfsDir?: (nullable:string)
+#
+# Return:
+#   None
+#
+# Notes:
+#
+# The following out parameters are returned
+#
+#   __DistroRid
+#   __PortableBuild
+#
+initDistroRidGlobal()
+{
+    # __DistroRid must be set at the end of the function.
+    # Previously we would create a variable __HostDistroRid and/or __DistroRid.
+    #
+    # __HostDistroRid was used in the case of a non-portable build, it has been
+    # deprecated. Now only __DistroRid is supported. It will be used for both
+    # portable and non-portable rids and will be used in build-packages.sh
+
+    local buildOs=$1
+    local buildArch=$2
+    local isPortable=$3
+    local rootfsDir=$4
+
+    # Setup whether this is a crossbuild. We can find this out if rootfsDir
+    # is set. 
+    local isCrossBuild=0
+
+    if [ -z "${rootfsDir}" ]; then
+        isCrossBuild=0
+    else
+        # We may have a cross build. Check for the existance of the rootfsDir
+        if [ -e ${rootfsDir} ]; then
+            isCrossBuild=1
+        else
+            echo "Error rootfsDir has been passed, but the location is not valid."
+            exit 1
+        fi
+    fi
+
+    initNonPortableDistroRid ${buildOs} ${buildArch} ${isPortable} ${rootfsDir}
+
+    if [ -z "${__DistroRid}" ]; then
+        # The non-portable build rid was not set. Set the portable rid.
+
+        export __PortableBuild=1
+        local distroRid=""
+
+        # Check for alpine. It is the only portable build that will will have
+        # its name in the portable build rid.
+        if [ -e "${rootfsDir}/etc/os-release" ]; then
+            source "${rootfsDir}/etc/os-release"
+            if [ "${ID}" = "alpine" ]; then
+                distroRid="linux-musl-${buildArch}"
+            fi
+        fi
+
+        if [ "${distroRid}" == "" ]; then
+            if [ "$buildOs" = "Linux" ]; then
+                distroRid="linux-$buildArch"
+            elif [ "$buildOs" = "OSX" ]; then
+                distroRid="osx-$buildArch"
+            elif [ "$buildOs" = "FreeBSD" ]; then
+                distroRid="freebsd-$buildArch"
+            fi
+        fi
+
+        export __DistroRid=${distroRid}
+    fi
+
+    if [ -z "$__DistroRid" ]; then
+        echo "DistroRid is not set. This is almost certainly an error"
+
+        exit 1
+    else
+        echo "__DistroRid: ${__DistroRid}"
+        echo "__RuntimeId: ${__DistroRid}"
+        
+        export __RuntimeId=${__DistroRid}
+    fi
+}
\ No newline at end of file