Bug #13786: Unexpected behavior handling shebang

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
• Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN

[vo.x (Vit Ondruch)]

Ruby exhibits unexpected behavior handling this shebang:

$ cat <<EOF > foo
> #!/usr/bin/scl enable rh-ruby22 -- ruby
> EOF

$ ruby foo
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- uby (LoadError)
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'

This was originally reported here 1.

[shevegen (Robert A. Heiler)]

May I ask, what is the scl program doing with the shebang line?

[vo.x (Vit Ondruch)]

shevegen (Robert A. Heiler) wrote:

May I ask, what is the scl program doing with the shebang line?

Ok, lets use different shebangs, where the "scl" won't distract you:

$ cat <<EOF > foo
> #!/usr/bin/ruby -- ruby
> EOF

$ ruby foo
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- uby (LoadError)
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'

$ cat <<EOF > foo
> #!rubbish ruby -- ruby
> EOF

$ ruby foo
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- uby (LoadError)
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'

[nobu (Nobuyoshi Nakada)]

Ruby tries to parse options after "ruby" in a shebang line, and assumes there are only options.
So the last "ruby" is treated as "-ruby" option.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r59564.

---

ruby.c: ignore non-option in shebang line

• ruby.c (moreswitches): process all words as options only in
  an environment variable, but not in a shebang line.
  [ruby-core:82267] [Bug #13786]