Change packaging to differentiate only between major versions and previews (#6968)

Change the *nix packaging over with the following changes:

Package name (as used by e.g. apt):
Non-preview releases are namedpowershell
Preview releases are named powershell-preview
Installation path:
No longer looks like /opt/microsoft/powershell/6.1.0/ or /opt/microsoft/powershell/6.1.0-preview.1/
Non-previews go to a path like /opt/microsoft/powershell/6/
Previews go to a path like /opt/microsoft/powershell/6-preview/
Path to executable symlink:
Allows SxS with preview
Non-previews linked to /usr/bin/pwsh or /usr/local/bin/pwsh on macOS
Previews linked to /usr/bin/pwsh-preview or /usr/local/bin/pwsh-preview on macOS
Implements PowerShell/PowerShell-RFC#115 (comment)

tools/appimage.sh

@@ -405,7 +405,7 @@ OPTIONS="-o Debug::NoLocking=1
 -o APT::Install-Suggests=0
 "
 
-cp ../powershell_*ubuntu.14.04_amd64.deb .
+cp ../powershell*ubuntu.14.04_amd64.deb .
 
 # Add local repository so that we can install deb files
 # that were downloaded outside of a repository

tools/packaging/packaging.psm1

@@ -600,17 +600,23 @@ function New-UnixPackage {
             }
         }
 
+        # Determine if the version is a preview version
+        $IsPreview = $Version.Contains("-preview")
+
+        # Preview versions have preview in the name
+        $Name = if ($IsPreview) { "powershell-preview" } else { "powershell" }
+
         # Verify dependencies are installed and in the path
         Test-Dependencies
 
         $Description = $packagingStrings.Description
 
-        # Suffix is used for side-by-side package installation
-        $Suffix = $Name -replace "^powershell"
-        if (!$Suffix) {
-            Write-Verbose "Suffix not given, building primary PowerShell package!"
-            $Suffix = $packageVersion
-        }
+        # Break the version down into its components, we are interested in the major version
+        $VersionMatch = [regex]::Match($Version, '(\d+)(?:.(\d+)(?:.(\d+)(?:-preview(?:.(\d+))?)?)?)?')
+        $MajorVersion = $VersionMatch.Groups[1].Value
+
+        # Suffix is used for side-by-side preview/release package installation
+        $Suffix = if ($IsPreview) { $MajorVersion + "-preview" } else { $MajorVersion }
 
         # Setup staging directory so we don't change the original source directory
         $Staging = "$PSScriptRoot/staging"
@@ -627,9 +633,9 @@ function New-UnixPackage {
 
         # Destination for symlink to powershell executable
         $Link = if ($Environment.IsLinux) {
-            "/usr/bin/"
+            if ($IsPreview) { "/usr/bin/pwsh-preview" } else { "/usr/bin/pwsh" }
         } elseif ($Environment.IsMacOS) {
-            "/usr/local/bin/"
+            if ($IsPreview) { "/usr/local/bin/pwsh-preview" } else { "/usr/local/bin/pwsh" }
         }
         $linkSource = "/tmp/pwsh"
 

tools/travis.ps1

@@ -269,8 +269,6 @@ elseif($Stage -eq 'Build')
 
         # Only build packages for branches, not pull requests
         $packages = @(Start-PSPackage @packageParams -SkipReleaseChecks)
-        # Packaging AppImage depends on the deb package
-        $packages += Start-PSPackage  @packageParams -Type AppImage -SkipReleaseChecks
         foreach($package in $packages)
         {
             # Publish the packages to the nuget feed if: