/usr/share/lilypond/2.18.2/ly/init.ly is in lilypond-data 2.18.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%% switch on debugging.
#(if (and #t (defined? 'set-debug-cell-accesses!))
(set-debug-cell-accesses! 5000))
\version "2.16.0"
#(session-initialize
(lambda ()
;; we can't use ly:parser-include-string here since that does not
;; actually do any parsing but merely switches inputs, so the
;; session saved by the session initializer after calling this
;; function has not actually started. A parser clone, in contrast,
;; can run and complete synchronously and shares the module with
;; the current parser.
(ly:parser-parse-string (ly:parser-clone parser)
"\\include \"declarations-init.ly\"")))
#(note-names-language parser default-language)
#(define location #f)
#(define toplevel-scores (list))
#(define toplevel-bookparts (list))
#(define $defaultheader #f)
#(define $current-book #f)
#(define $current-bookpart #f)
#(define version-seen #f)
#(define expect-error #f)
#(define output-empty-score-list #f)
#(define output-suffix #f)
#(use-modules (scm clip-region))
#(use-modules (srfi srfi-1))
$(if (ly:get-option 'include-settings)
(ly:parser-include-string parser
(format #f "\\include \"~a\"" (ly:get-option 'include-settings))))
\maininput
%% there is a problem at the end of the input file
%%
%% Above and below comments compensate for the parser's look-ahead.
%%
#(if (and (not version-seen)
(defined? 'input-file-name))
(version-not-seen-message input-file-name))
#(ly:set-option 'protected-scheme-parsing #f)
#(let ((book-handler (if (defined? 'default-toplevel-book-handler)
default-toplevel-book-handler
toplevel-book-handler)))
(cond ((pair? toplevel-bookparts)
(let ((book (ly:make-book $defaultpaper $defaultheader)))
(for-each (lambda (part)
(ly:book-add-bookpart! book part))
(reverse! toplevel-bookparts))
(set! toplevel-bookparts (list))
;; if scores have been defined after the last explicit \bookpart:
(if (pair? toplevel-scores)
(for-each (lambda (score)
(ly:book-add-score! book score))
(reverse! toplevel-scores)))
(set! toplevel-scores (list))
(book-handler parser book)))
((or (pair? toplevel-scores) output-empty-score-list)
(let ((book (apply ly:make-book $defaultpaper
$defaultheader toplevel-scores)))
(set! toplevel-scores (list))
(book-handler parser book)))))
#(if (eq? expect-error (ly:parser-has-error? parser))
(ly:parser-clear-error parser)
(if expect-error
(ly:parser-error parser (_ "expected error, but none found"))))
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