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;;;; -------------------------------------------------------------------------
;;;; Finding systems
Francois-Rene Rideau
committed
(asdf/package:define-package :asdf/find-system
(:recycle :asdf/find-system :asdf)
Francois-Rene Rideau
committed
(:use :common-lisp :asdf/compatibility :asdf/utility :asdf/pathname :asdf/stream :asdf/os
:asdf/lisp-build :asdf/upgrade :asdf/component :asdf/system)
(:export
#:coerce-name #:find-system #:locate-system #:load-sysdef #:with-system-definitions
#:system-registered-p #:register-system #:registered-systems #:clear-system #:map-systems
#:system-definition-error #:missing-component #:missing-requires #:missing-parent
#:formatted-system-definition-error #:format-control #:format-arguments #:sysdef-error
#:load-system-definition-error #:error-name #:error-pathname #:error-condition
#:*system-definition-search-functions* #:search-for-system-definition
#:*central-registry* #:probe-asd #:sysdef-central-registry-search
#:make-temporary-package #:find-system-if-being-defined #:*systems-being-defined*
#:find-system-fallback #:sysdef-find-asdf
#:make-defined-systems-table #:*defined-systems*
;; defined in source-registry, but specially mentioned here:
#:initialize-source-registry #:sysdef-source-registry-search))
(in-package :asdf/find-system)
(declaim (ftype (function (&optional t) t) initialize-source-registry)) ; forward reference
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(define-condition system-definition-error (error) ()
;; [this use of :report should be redundant, but unfortunately it's not.
;; cmucl's lisp::output-instance prefers the kernel:slot-class-print-function
;; over print-object; this is always conditions::%print-condition for
;; condition objects, which in turn does inheritance of :report options at
;; run-time. fortunately, inheritance means we only need this kludge here in
;; order to fix all conditions that build on it. -- rgr, 28-Jul-02.]
#+cmu (:report print-object))
(define-condition missing-component (system-definition-error)
((requires :initform "(unnamed)" :reader missing-requires :initarg :requires)
(parent :initform nil :reader missing-parent :initarg :parent)))
(define-condition formatted-system-definition-error (system-definition-error)
((format-control :initarg :format-control :reader format-control)
(format-arguments :initarg :format-arguments :reader format-arguments))
(:report (lambda (c s)
(apply 'format s (format-control c) (format-arguments c)))))
(define-condition load-system-definition-error (system-definition-error)
((name :initarg :name :reader error-name)
(pathname :initarg :pathname :reader error-pathname)
(condition :initarg :condition :reader error-condition))
(:report (lambda (c s)
(format s (compatfmt "~@<Error while trying to load definition for system ~A from pathname ~A: ~3i~_~A~@:>")
(error-name c) (error-pathname c) (error-condition c)))))
(defun* sysdef-error (format &rest arguments)
(error 'formatted-system-definition-error :format-control
format :format-arguments arguments))
(defun* make-defined-systems-table ()
(make-hash-table :test 'equal))
(defvar *defined-systems* (make-defined-systems-table)
"This is a hash table whose keys are strings, being the
names of the systems, and whose values are pairs, the first
element of which is a universal-time indicating when the
system definition was last updated, and the second element
of which is a system object.")
(defun* coerce-name (name)
(typecase name
(component (component-name name))
(symbol (string-downcase (symbol-name name)))
(string name)
(t (sysdef-error (compatfmt "~@<Invalid component designator: ~3i~_~A~@:>") name))))
(defun* system-registered-p (name)
(gethash (coerce-name name) *defined-systems*))
(defun* registered-systems ()
(loop :for (() . system) :being :the :hash-values :of *defined-systems*
:collect (coerce-name system)))
(defun* register-system (system)
(check-type system system)
(let ((name (component-name system)))
(check-type name string)
(asdf-message (compatfmt "~&~@<; ~@;Registering ~3i~_~A~@:>~%") system)
(unless (eq system (cdr (gethash name *defined-systems*)))
(setf (gethash name *defined-systems*)
(cons (if-bind (file (ignore-errors (system-source-file system)))
(safe-file-write-date file))
system)))))
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(defun* clear-system (name)
"Clear the entry for a system in the database of systems previously loaded.
Note that this does NOT in any way cause the code of the system to be unloaded."
;; There is no "unload" operation in Common Lisp, and
;; a general such operation cannot be portably written,
;; considering how much CL relies on side-effects to global data structures.
(remhash (coerce-name name) *defined-systems*))
(defun* map-systems (fn)
"Apply FN to each defined system.
FN should be a function of one argument. It will be
called with an object of type asdf:system."
(loop :for (nil . system) :being :the hash-values :of *defined-systems*
:do (funcall fn system)))
;;; for the sake of keeping things reasonably neat, we adopt a
;;; convention that functions in this list are prefixed SYSDEF-
(defvar *system-definition-search-functions* '())
(setf *system-definition-search-functions*
(append
;; Remove known-incompatible sysdef functions from ancient sbcl asdf.
(remove 'contrib-sysdef-search *system-definition-search-functions*)
;; Tuck our defaults at the end of the list if they were absent.
;; This is imperfect, in case they were removed on purpose,
;; but then it will be the responsibility of whoever does that
;; to upgrade asdf before he does such a thing rather than after.
(remove-if #'(lambda (x) (member x *system-definition-search-functions*))
'(sysdef-central-registry-search
sysdef-source-registry-search
sysdef-find-asdf))))
(defun* search-for-system-definition (system)
(some (let ((name (coerce-name system))) #'(lambda (x) (funcall x name)))
(cons 'find-system-if-being-defined
*system-definition-search-functions*)))
(defvar *central-registry* nil
"A list of 'system directory designators' ASDF uses to find systems.
A 'system directory designator' is a pathname or an expression
which evaluates to a pathname. For example:
(setf asdf:*central-registry*
(list '*default-pathname-defaults*
#p\"/home/me/cl/systems/\"
#p\"/usr/share/common-lisp/systems/\"))
This is for backward compatibilily.
Going forward, we recommend new users should be using the source-registry.
")
(defun* probe-asd (name defaults)
(block nil
(when (directory-pathname-p defaults)
(let* ((file (probe-file* (subpathname defaults (strcat name ".asd")))))
(when file
(return file)))
#-(or clisp genera) ; clisp doesn't need it, plain genera doesn't have read-sequence(!)
(when (os-windows-p)
(let ((shortcut
(make-pathname
:defaults defaults :version :newest :case :local
:name (strcat name ".asd")
:type "lnk")))
(when (probe-file* shortcut)
(let ((target (parse-windows-shortcut shortcut)))
(when target
(return (pathname target))))))))))
(defun* sysdef-central-registry-search (system)
(let ((name (coerce-name system))
(to-remove nil)
(to-replace nil))
(block nil
(unwind-protect
(dolist (dir *central-registry*)
(let ((defaults (eval dir)))
(when defaults
(cond ((directory-pathname-p defaults)
(let ((file (probe-asd name defaults)))
(when file
(return file))))
(t
(restart-case
(let* ((*print-circle* nil)
(message
(format nil
(compatfmt "~@<While searching for system ~S: ~3i~_~S evaluated to ~S which is not a directory.~@:>")
system dir defaults)))
(error message))
(remove-entry-from-registry ()
:report "Remove entry from *central-registry* and continue"
(push dir to-remove))
(coerce-entry-to-directory ()
:report (lambda (s)
(format s (compatfmt "~@<Coerce entry to ~a, replace ~a and continue.~@:>")
(ensure-directory-pathname defaults) dir))
(push (cons dir (ensure-directory-pathname defaults)) to-replace))))))))
;; cleanup
(dolist (dir to-remove)
(setf *central-registry* (remove dir *central-registry*)))
(dolist (pair to-replace)
(let* ((current (car pair))
(new (cdr pair))
(position (position current *central-registry*)))
(setf *central-registry*
(append (subseq *central-registry* 0 position)
(list new)
(subseq *central-registry* (1+ position))))))))))
(defun* make-temporary-package ()
(flet ((try (counter)
(ignore-errors
(make-package (format nil "~A~D" :asdf counter)
:use '(:cl :asdf/interface)))))
(do* ((counter 0 (+ counter 1))
(package (try counter) (try counter)))
(package package))))
(defmethod find-system ((name null) &optional (error-p t))
(declare (ignorable name))
(when error-p
(sysdef-error (compatfmt "~@<NIL is not a valid system name~@:>"))))
(defmethod find-system (name &optional (error-p t))
(find-system (coerce-name name) error-p))
(defvar *systems-being-defined* nil
"A hash-table of systems currently being defined keyed by name, or NIL")
(defun* find-system-if-being-defined (name)
(when *systems-being-defined*
(gethash (coerce-name name) *systems-being-defined*)))
(defun* call-with-system-definitions (thunk)
(if *systems-being-defined*
(funcall thunk)
(let ((*systems-being-defined* (make-hash-table :test 'equal)))
(funcall thunk))))
(defmacro with-system-definitions ((&optional) &body body)
`(call-with-system-definitions #'(lambda () ,@body)))
(defun* load-sysdef (name pathname)
;; Tries to load system definition with canonical NAME from PATHNAME.
(with-system-definitions ()
(let ((package (make-temporary-package)))
(unwind-protect
(handler-bind
((error #'(lambda (condition)
(error 'load-system-definition-error
:name name :pathname pathname
:condition condition))))
(let ((*package* package)
(*default-pathname-defaults*
;; resolve logical-pathnames so they won't wreak havoc in parsing namestrings.
(pathname-directory-pathname (translate-logical-pathname pathname)))
(external-format (encoding-external-format (detect-encoding pathname))))
(asdf-message (compatfmt "~&~@<; ~@;Loading system definition from ~A into ~A~@:>~%")
pathname package)
(with-controlled-loader-conditions ()
(load* pathname :external-format external-format))))
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(delete-package package)))))
(defun* locate-system (name)
"Given a system NAME designator, try to locate where to load the system from.
Returns five values: FOUNDP FOUND-SYSTEM PATHNAME PREVIOUS PREVIOUS-TIME
FOUNDP is true when a system was found,
either a new unregistered one or a previously registered one.
FOUND-SYSTEM when not null is a SYSTEM object that may be REGISTER-SYSTEM'ed as is
PATHNAME when not null is a path from where to load the system,
either associated with FOUND-SYSTEM, or with the PREVIOUS system.
PREVIOUS when not null is a previously loaded SYSTEM object of same name.
PREVIOUS-TIME when not null is the time at which the PREVIOUS system was loaded."
(let* ((name (coerce-name name))
(in-memory (system-registered-p name)) ; load from disk if absent or newer on disk
(previous (cdr in-memory))
(previous (and (typep previous 'system) previous))
(previous-time (car in-memory))
(found (search-for-system-definition name))
(found-system (and (typep found 'system) found))
(pathname (or (and (typep found '(or pathname string)) (pathname found))
(and found-system (system-source-file found-system))
(and previous (system-source-file previous))))
(foundp (and (or found-system pathname previous) t)))
(check-type found (or null pathname system))
(when foundp
(setf pathname (resolve-symlinks* pathname))
(when (and pathname (not (absolute-pathname-p pathname)))
(setf pathname (ensure-pathname-absolute pathname))
(when found-system
(%set-system-source-file pathname found-system)))
(when (and previous (not (#-cormanlisp equal #+cormanlisp equalp
(system-source-file previous) pathname)))
(%set-system-source-file pathname previous)
(setf previous-time nil))
(values foundp found-system pathname previous previous-time))))
(defmethod find-system ((name string) &optional (error-p t))
(with-system-definitions ()
(loop
(restart-case
(multiple-value-bind (foundp found-system pathname previous previous-time)
(locate-system name)
(declare (ignore foundp))
(when (and found-system (not previous))
(register-system found-system))
(unless (and (equal pathname (and previous (system-source-file previous)))
(stamp<= (safe-file-write-date pathname) previous-time))
;; only load when it's a different pathname, or newer file content
(load-sysdef name pathname))
(let ((in-memory (system-registered-p name))) ; try again after loading from disk if needed
(return
(cond
(in-memory
(when pathname
(setf (car in-memory) (safe-file-write-date pathname)))
(cdr in-memory))
(error-p
(error 'missing-component :requires name))))))
(reinitialize-source-registry-and-retry ()
:report (lambda (s)
(format s (compatfmt "~@<Retry finding system ~A after reinitializing the source-registry.~@:>") name))
(initialize-source-registry))))))
(defun* find-system-fallback (requested fallback &rest keys &key source-file &allow-other-keys)
(setf fallback (coerce-name fallback)
requested (coerce-name requested))
(when (equal requested fallback)
(let ((registered (cdr (gethash fallback *defined-systems*))))
(or registered
(apply 'make-instance 'system
:name fallback :source-file source-file keys)))))
(defun* sysdef-find-asdf (name)
;; Bug: :version *asdf-version* won't be updated when ASDF is updated.
(find-system-fallback name "asdf" :version (asdf-version)))