Stop using shallow clones for taps

Library/Homebrew/cmd/tap.rb

@@ -27,11 +27,6 @@ module Homebrew
         assumptions, so taps can be cloned from places other than GitHub and
         using protocols other than HTTPS, e.g. SSH, git, HTTP, FTP(S), rsync.
       EOS
-      switch "--full",
-             description: "Convert a shallow clone to a full clone without untapping. Taps are only cloned as "\
-                          "shallow clones if `--shallow` was originally passed."
-      switch "--shallow",
-             description: "Fetch tap as a shallow clone rather than a full clone. Useful for continuous integration."
       switch "--force-auto-update",
              description: "Auto-update tap even if it is not hosted on GitHub. By default, only taps "\
                           "hosted on GitHub are auto-updated (for performance reasons)."
@@ -56,18 +51,11 @@ module Homebrew
     elsif args.no_named?
       puts Tap.names
     else
-      full_clone = if args.full?
-        true
-      else
-        !args.shallow?
-      end
-      odebug "Tapping as #{full_clone ? "full" : "shallow"} clone"
       tap = Tap.fetch(args.named.first)
       begin
         tap.install clone_target:      args.named.second,
                     force_auto_update: force_auto_update?(args: args),
-                    quiet:             args.quiet?,
-                    full_clone:        full_clone
+                    quiet:             args.quiet?
       rescue TapRemoteMismatchError => e
         odie e
       rescue TapAlreadyTappedError

Library/Homebrew/tap.rb

@@ -244,9 +244,8 @@ class Tap
   # @param clone_target [String] If passed, it will be used as the clone remote.
   # @param force_auto_update [Boolean, nil] If present, whether to override the
   #   logic that skips non-GitHub repositories during auto-updates.
-  # @param full_clone [Boolean] If set as true, full clone will be used. If unset/nil, means "no change".
   # @param quiet [Boolean] If set, suppress all output.
-  def install(full_clone: true, quiet: false, clone_target: nil, force_auto_update: nil)
+  def install(quiet: false, clone_target: nil, force_auto_update: nil)
     require "descriptions"
     require "readall"
 
@@ -270,11 +269,13 @@ class Tap
     if installed?
       unless force_auto_update.nil?
         config["forceautoupdate"] = force_auto_update
-        return if !full_clone || !shallow?
+        return
       end
 
-      $stderr.ohai "Unshallowing #{name}" unless quiet
-      args = %w[fetch --unshallow]
+      $stderr.ohai "Unshallowing #{name}" if shallow? && !quiet
+      args = %w[fetch]
+      # Git throws an error when attempting to unshallow a full clone
+      args << "--unshallow" if shallow?
       args << "-q" if quiet
       path.cd { safe_system "git", *args }
       return
@@ -288,7 +289,6 @@ class Tap
     # Override possible user configs like:
     #   git config --global clone.defaultRemoteName notorigin
     args << "--origin=origin"
-    args << "--depth=1" unless full_clone
     args << "-q" if quiet
 
     begin