Fetch necessary revision of bundled gems

Author: nobu

tool/fetch-bundled_gems.rb

@@ -32,12 +32,12 @@
   system(*%W"git clone #{u} #{n}") or abort
 end
 
-if r
-  puts "fetching #{color.notice(r)} ..."
-  system("git", "fetch", "origin", r, chdir: n) or abort
+c = [r, v, "v#{v}"].find do |c|
+  next unless c
+  puts "fetching #{color.notice(c)} ..."
+  system("git", "fetch", "origin", c, chdir: n)
 end
 
-c = r || "v#{v}"
 checkout = %w"git -c advice.detachedHead=false checkout"
 print %[checking out #{color.notice(c)} (v=#{color.info(v)}]
 print %[, r=#{color.info(r)}] if r