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-rw-r--r--lib/rubygems/installer.rb39
1 files changed, 23 insertions, 16 deletions
diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index bb08549c215..37264103b44 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -98,7 +98,12 @@ class Gem::Installer
:source_index => Gem.source_index,
}.merge options
- @env_shebang = options[:env_shebang]
+ if @env_shebang = options[:env_shebang]
+ unless File.executable?(shebang = "/usr/bin/env")
+ shebang = "/bin/env"
+ end
+ @env_shebang = shebang
+ end
@force = options[:force]
gem_home = options[:install_dir]
@gem_home = Pathname.new(gem_home).expand_path
@@ -387,22 +392,24 @@ class Gem::Installer
# necessary.
def shebang(bin_file_name)
- if @env_shebang then
- "#!/usr/bin/env " + Gem::ConfigMap[:ruby_install_name]
+ ruby_name = Gem::ConfigMap[:ruby_install_name] unless @env_shebang
+ path = File.join @gem_dir, @spec.bindir, bin_file_name
+ first_line = File.open(path, "rb") {|file| file.gets}
+ if /\A#!/ =~ first_line then
+ # Preserve extra words on shebang line, like "-w". Thanks RPA.
+ shebang = first_line.sub(/\A\#!.*?ruby\S*(?=\s*(\S+))/, "#!#{Gem.ruby}")
+ shebang.strip! # Avoid nasty ^M issues.
+ if ruby_name and $1
+ %{#!/bin/sh\n'exec' '#{ruby_name}' '-x' "$0" "$@"\n#{shebang}}
+ else
+ shebang
+ end
else
- path = File.join @gem_dir, @spec.bindir, bin_file_name
-
- File.open(path, "rb") do |file|
- first_line = file.gets
- if first_line =~ /^#!/ then
- # Preserve extra words on shebang line, like "-w". Thanks RPA.
- shebang = first_line.sub(/\A\#!.*?ruby\S*/, "#!#{Gem.ruby}")
- else
- # Create a plain shebang line.
- shebang = "#!#{Gem.ruby}"
- end
-
- shebang.strip # Avoid nasty ^M issues.
+ # Create a plain shebang line.
+ if ruby_name
+ "#!#@env_shebang #{ruby_name}"
+ else
+ "#!#{Gem.ruby}"
end
end
end