Support enabling auto-updates for non-GitHub taps

Library/Homebrew/cmd/tap.rb

@@ -1,7 +1,7 @@
 #:  * `tap`:
 #:    List all installed taps.
 #:
-#:  * `tap` [`--full`] <user>`/`<repo> [<URL>]:
+#:  * `tap` [`--full`] [`--force-auto-update`] <user>`/`<repo> [<URL>]:
 #:    Tap a formula repository.
 #:
 #:    With <URL> unspecified, taps a formula repository from GitHub using HTTPS.
@@ -18,6 +18,10 @@
 #:    if `--full` is passed, a full clone will be used. To convert a shallow copy
 #:    to a full copy, you can retap passing `--full` without first untapping.
 #:
+#:    By default, only taps hosted on GitHub are auto-updated (for performance
+#:    reasons). If `--force-auto-update` is passed, this tap will be auto-updated
+#:    even if it is not hosted on GitHub.
+#:
 #:    `tap` is re-runnable and exits successfully if there's nothing to do.
 #:    However, retapping with a different <URL> will cause an exception, so first
 #:    `untap` if you need to modify the <URL>.
@@ -44,6 +48,7 @@ module Homebrew
       tap = Tap.fetch(ARGV.named[0])
       begin
         tap.install clone_target: ARGV.named[1],
+                    force_auto_update: force_auto_update?,
                     full_clone: full_clone?,
                     quiet: ARGV.quieter?
       rescue TapRemoteMismatchError => e
@@ -56,4 +61,9 @@ module Homebrew
   def full_clone?
     ARGV.include?("--full") || ARGV.homebrew_developer?
   end
+
+  def force_auto_update?
+    # if no relevant flag is present, return nil, meaning "no change"
+    true if ARGV.include?("--force-auto-update")
+  end
 end

Library/Homebrew/cmd/update.sh

@@ -493,8 +493,12 @@ EOS
         [[ -z "$HOMEBREW_UPDATE_FORCE" ]] && [[ "$UPSTREAM_SHA_HTTP_CODE" = "304" ]] && exit
       elif [[ -n "$HOMEBREW_UPDATE_PREINSTALL" ]]
       then
-        # Don't try to do a `git fetch` that may take longer than expected.
+        FORCE_AUTO_UPDATE="$(git config homebrew.forceautoupdate 2>/dev/null || echo "false")"
-        exit
+        if [[ "$FORCE_AUTO_UPDATE" != "true" ]]
+        then
+          # Don't try to do a `git fetch` that may take longer than expected.
+          exit
+        fi
       fi
 
       if [[ -n "$HOMEBREW_VERBOSE" ]]

Library/Homebrew/tap.rb

@@ -201,7 +201,9 @@ class Tap
   # install this {Tap}.
   #
   # @param [Hash] options
-  # @option options [String]  :clone_targe If passed, it will be used as the clone remote.
+  # @option options [String] :clone_target If passed, it will be used as the clone remote.
+  # @option options [Boolean, nil] :force_auto_update If present, whether to override the
+  #   logic that skips non-GitHub repositories during auto-updates.
   # @option options [Boolean] :full_clone If set as true, full clone will be used.
   # @option options [Boolean] :quiet If set, suppress all output.
   def install(options = {})
@@ -210,12 +212,14 @@ class Tap
     full_clone = options.fetch(:full_clone, false)
     quiet = options.fetch(:quiet, false)
     requested_remote = options[:clone_target] || default_remote
+    # if :force_auto_update is unset, use nil, meaning "no change"
+    force_auto_update = options.fetch(:force_auto_update, nil)
 
     if official? && DEPRECATED_OFFICIAL_TAPS.include?(repo)
       odie "#{name} was deprecated. This tap is now empty as all its formulae were migrated."
     end
 
-    if installed?
+    if installed? && force_auto_update.nil?
       raise TapAlreadyTappedError, name unless full_clone
       raise TapAlreadyUnshallowError, name unless shallow?
     end
@@ -224,6 +228,11 @@ class Tap
     Utils.ensure_git_installed!
 
     if installed?
+      unless force_auto_update.nil?
+        config["forceautoupdate"] = force_auto_update
+        return if !full_clone || !shallow?
+      end
+
       if options[:clone_target] && requested_remote != remote
         raise TapRemoteMismatchError.new(name, @remote, requested_remote)
       end
@@ -259,6 +268,8 @@ class Tap
       raise
     end
 
+    config["forceautoupdate"] = force_auto_update unless force_auto_update.nil?
+
     link_completions_and_manpages
 
     formula_count = formula_files.size

Library/Homebrew/test/dev-cmd/tap_spec.rb

@@ -55,11 +55,26 @@ describe "brew tap", :integration_test do
       .and not_to_output.to_stderr
       .and be_a_success
 
+    expect { brew "tap", "--force-auto-update", "homebrew/bar", path/".git" }
+      .to output(/Tapped/).to_stdout
+      .and output(/Cloning/).to_stderr
+      .and be_a_success
+
+    expect { brew "untap", "homebrew/bar" }
+      .to output(/Untapped/).to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+
     expect { brew "tap", "homebrew/bar", path/".git", "-q", "--full" }
       .to be_a_success
       .and not_to_output.to_stdout
       .and not_to_output.to_stderr
 
+    expect { brew "tap", "--force-auto-update", "homebrew/bar" }
+      .to be_a_success
+      .and not_to_output.to_stdout
+      .and not_to_output.to_stderr
+
     expect { brew "untap", "homebrew/bar" }
       .to output(/Untapped/).to_stdout
       .and not_to_output.to_stderr

Library/Homebrew/test/tap_spec.rb

@@ -209,6 +209,31 @@ describe Tap do
       expect { already_tapped_tap.install full_clone: true }.to raise_error(TapAlreadyUnshallowError)
     end
 
+    describe "force_auto_update" do
+      before do
+        setup_git_repo
+      end
+
+      let(:already_tapped_tap) { described_class.new("Homebrew", "foo") }
+
+      it "defaults to nil" do
+        expect(already_tapped_tap).to be_installed
+        expect(already_tapped_tap.config["forceautoupdate"]).to be_nil
+      end
+
+      it "enables forced auto-updates when true" do
+        expect(already_tapped_tap).to be_installed
+        already_tapped_tap.install force_auto_update: true
+        expect(already_tapped_tap.config["forceautoupdate"]).to eq("true")
+      end
+
+      it "disables forced auto-updates when false" do
+        expect(already_tapped_tap).to be_installed
+        already_tapped_tap.install force_auto_update: false
+        expect(already_tapped_tap.config["forceautoupdate"]).to eq("false")
+      end
+    end
+
     specify "Git error" do
       tap = described_class.new("user", "repo")
 

docs/Manpage.md

@@ -448,7 +448,7 @@ With `--verbose` or `-v`, many commands print extra debugging information. Note
   * `tap`:
     List all installed taps.
 
-  * `tap` [`--full`] `user``/``repo` [`URL`]:
+  * `tap` [`--full`] [`--force-auto-update`] `user``/``repo` [`URL`]:
     Tap a formula repository.
 
     With `URL` unspecified, taps a formula repository from GitHub using HTTPS.
@@ -465,6 +465,10 @@ With `--verbose` or `-v`, many commands print extra debugging information. Note
     if `--full` is passed, a full clone will be used. To convert a shallow copy
     to a full copy, you can retap passing `--full` without first untapping.
 
+    By default, only taps hosted on GitHub are auto-updated (for performance
+    reasons). If `--force-auto-update` is passed, this tap will be auto-updated
+    even if it is not hosted on GitHub.
+
     `tap` is re-runnable and exits successfully if there's nothing to do.
     However, retapping with a different `URL` will cause an exception, so first
     `untap` if you need to modify the `URL`.

manpages/brew.1

@@ -463,7 +463,7 @@ Symlink all of the specific \fIversion\fR of \fIformula\fR\'s install to Homebre
 List all installed taps\.
 .
 .TP
-\fBtap\fR [\fB\-\-full\fR] \fIuser\fR\fB/\fR\fIrepo\fR [\fIURL\fR]
+\fBtap\fR [\fB\-\-full\fR] [\fB\-\-force\-auto\-update\fR] \fIuser\fR\fB/\fR\fIrepo\fR [\fIURL\fR]
 Tap a formula repository\.
 .
 .IP
@@ -476,6 +476,9 @@ With \fIURL\fR specified, taps a formula repository from anywhere, using any tra
 By default, the repository is cloned as a shallow copy (\fB\-\-depth=1\fR), but if \fB\-\-full\fR is passed, a full clone will be used\. To convert a shallow copy to a full copy, you can retap passing \fB\-\-full\fR without first untapping\.
 .
 .IP
+By default, only taps hosted on GitHub are auto\-updated (for performance reasons)\. If \fB\-\-force\-auto\-update\fR is passed, this tap will be auto\-updated even if it is not hosted on GitHub\.
+.
+.IP
 \fBtap\fR is re\-runnable and exits successfully if there\'s nothing to do\. However, retapping with a different \fIURL\fR will cause an exception, so first \fBuntap\fR if you need to modify the \fIURL\fR\.
 .
 .TP