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utils: Add a `path' argument to `patch-shebang'. 

* guix/build/utils.scm (patch-shebang): Add an optional `path'
  parameter.  Change SHEBANG-RX to match the whole interpreter file
  name.  Don't patch when BIN and CMD are the same.  Add docstring.
This commit is contained in:
Ludovic Courtès 2012-08-19 21:50:03 +02:00
parent 54ba617e9f
commit 525a59d6d3
1 changed files with 17 additions and 15 deletions
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32
guix/build/utils.scm
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@ -255,10 +255,12 @@ match substring."
(loop (get-bytevector-n! in buffer 0 buffer-size))))))
(define patch-shebang
(let ((shebang-rx (make-regexp "^[[:blank:]]*([[:graph:]]*)/([[:alnum:]]+)(.*)$")))
(lambda (file)
"Patch the #! interpreter path in FILE, if FILE actually starts with a
shebang."
(let ((shebang-rx (make-regexp "^[[:blank:]]*([[:graph:]]+)(.*)$")))
(lambda* (file
#:optional (path (search-path-as-string->list (getenv "PATH"))))
"Replace the #! interpreter file name in FILE by a valid one found in
PATH, when FILE actually starts with a shebang. Return #t when FILE was
patched, #f otherwise."
(define (patch p interpreter rest-of-line)
(let* ((template (string-append file ".XXXXXX"))
(out (mkstemp! template))
@ -287,21 +289,21 @@ shebang."
(let ((line (false-if-exception (read-line p))))
(and=> (and line (regexp-exec shebang-rx line))
(lambda (m)
(let* ((PATH
(search-path-as-string->list (getenv "PATH")))
(cmd (match:substring m 2))
(bin (search-path PATH cmd)))
(let* ((cmd (match:substring m 1))
(bin (search-path path
(basename cmd))))
(if bin
(begin
(format (current-error-port)
"patch-shebang: ~a: changing `~a/~a' to `~a'~%"
file (match:substring m 1)
cmd bin)
(patch p bin (match:substring m 3)))
(if (string=? bin cmd)
#f ; nothing to do
(begin
(format (current-error-port)
"patch-shebang: ~a: changing `~a' to `~a'~%"
file cmd bin)
(patch p bin (match:substring m 2))))
(begin
(format (current-error-port)
"patch-shebang: ~a: warning: no binary for interpreter `~a' found in $PATH~%"
file cmd)
file (basename cmd))
#f)))))))))))))
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