https://git.ruby-lang.org/ruby.git/commit/?id=d819d97cf0

From d819d97cf02fd0a5b5b1f6ee69c9fdb83276e6c2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 22 May 2019 23:18:09 +0900
Subject: Default to the current branch

* tool/make-snapshot: default to the current branch if no branch
  but srcdir is given.

diff --git a/tool/make-snapshot b/tool/make-snapshot
index cac32d3..423a4a4 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -143,7 +143,7 @@ end https://github.com/ruby/ruby/blob/trunk/tool/make-snapshot#L143
 unless destdir = ARGV.shift
   abort usage
 end
-revisions = ARGV.empty? ? ["trunk"] : ARGV
+revisions = ARGV.empty? ? [nil] : ARGV
 unless tmp = $exported
   FileUtils.mkpath(destdir)
   destdir = File.expand_path(destdir)
@@ -201,10 +201,12 @@ end https://github.com/ruby/ruby/blob/trunk/tool/make-snapshot#L201
 def package(vcs, rev, destdir, tmp = nil)
   patchlevel = false
   prerelease = false
-  if revision = rev[/@(\d+)\z/, 1]
+  if rev and revision = rev[/@(\d+)\z/, 1]
     rev = $`
   end
   case rev
+  when nil
+    url = nil
   when /\Atrunk\z/
     url = vcs.trunk
   when /\Abranches\//
@@ -234,7 +236,10 @@ def package(vcs, rev, destdir, tmp = nil) https://github.com/ruby/ruby/blob/trunk/tool/make-snapshot#L236
     warn "#{$0}: unknown version - #{rev}"
     return
   end
-  revision ||= vcs.get_revisions(url)[0]
+  if !revision and revision = vcs.get_revisions(url)
+    url ||= vcs.branch(revision[3])
+    revision = revision[0]
+  end
   version = nil
   unless revision
     url = vcs.trunk
diff --git a/tool/vcs.rb b/tool/vcs.rb
index 3f0a331..f251c96 100644
--- a/tool/vcs.rb
+++ b/tool/vcs.rb
@@ -278,6 +278,7 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/vcs.rb#L278
     end
 
     def branch(name)
+      return trunk if name == "trunk"
       url + "branches/#{name}"
     end
 
-- 
cgit v0.10.2


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