Extend config/version.rb with more informations (#5061)

This gives installations not using git checkouts
to provide all the informations needed for the
internal version checks and version display in
the dashboard.

The build:stamp rake task was extended to also
add the new informations.

lib/discourse.rb

@@ -311,25 +311,44 @@ module Discourse
   def self.git_version
     return $git_version if $git_version
 
-    # load the version stamped by the "build:stamp" task
-    f = Rails.root.to_s + "/config/version"
-    require f if File.exists?("#{f}.rb")
-
-    begin
-      $git_version ||= `git rev-parse HEAD`.strip
-    rescue
-      $git_version = Discourse::VERSION::STRING
-    end
+    git_cmd='git rev-parse HEAD'
+    self.load_version_or_git(git_cmd, Discourse::VERSION::STRING) { $git_version }
   end
 
   def self.git_branch
     return $git_branch if $git_branch
+    git_cmd='git rev-parse --abbrev-ref HEAD'
+    self.load_version_or_git(git_cmd, 'unknown') { $git_branch }
+  end
 
-    begin
-      $git_branch ||= `git rev-parse --abbrev-ref HEAD`.strip
-    rescue
-      $git_branch = "unknown"
+  def self.full_version
+    return $full_version if $full_version
+    git_cmd='git describe --dirty --match "v[0-9]*"'
+    self.load_version_or_git(git_cmd, 'unknown') { $full_version }
+  end
+
+  def self.load_version_or_git(git_cmd, default_value)
+    version_file  = "#{Rails.root}/config/version.rb"
+    version_value = false
+
+    if File.exists?(version_file)
+      require version_file
+      version_value = yield
     end
+
+    # file does not exist or does not define the expected global variable
+    unless version_value
+      begin
+        version_value = `#{git_cmd}`.strip
+      rescue # sollte noch ausspezifiziert werden…
+        version_value = default_value
+      end
+    end
+    if version_value.empty?
+      version_value = default_value
+    end
+
+    version_value
   end
 
   # Either returns the site_contact_username user or the first admin.

lib/discourse_updates.rb

@@ -7,7 +7,7 @@ module DiscourseUpdates
         DiscourseVersionCheck.new(
           installed_version: Discourse::VERSION::STRING,
           installed_sha: (Discourse.git_version == 'unknown' ? nil : Discourse.git_version),
-          installed_describe: `git describe --dirty --match "v[0-9]*"`,
+          installed_describe: Discourse.full_version,
           git_branch: Discourse.git_branch,
           updated_at: nil
         )
@@ -17,7 +17,7 @@ module DiscourseUpdates
           critical_updates: critical_updates_available?,
           installed_version: Discourse::VERSION::STRING,
           installed_sha: (Discourse.git_version == 'unknown' ? nil : Discourse.git_version),
-          installed_describe: `git describe --dirty --match "v[0-9]*"`,
+          installed_describe: Discourse.full_version,
           missing_versions_count: missing_versions_count,
           git_branch: Discourse.git_branch,
           updated_at: updated_at

lib/tasks/build.rake

@@ -1,8 +1,13 @@
 desc "stamp the current build with the git hash placed in version.rb"
 task "build:stamp" => :environment do
-  git_version = `git rev-parse HEAD`.strip
+  git_version  = `git rev-parse HEAD`.strip
+  git_branch   = `git rev-parse --abbrev-ref HEAD`
+  full_version = `git describe --dirty --match "v[0-9]*"`
+
   File.open(Rails.root.to_s + '/config/version.rb', 'w') do |f|
-    f.write("$git_version = #{git_version.inspect}\n")
+    f.write("$git_version  = #{git_version.inspect}\n")
+    f.write("$git_branch   = #{git_branch.inspect}\n")
+    f.write("$full_version = #{full_version.inspect}\n")
   end
-  puts "Stamped current build with #{git_version}"
+  puts "Stamped current build with #{git_version} #{git_branch} #{full_version}"
 end