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;;; LOOKUP-GROUP-NAME translates a group id into a group name. Previous
;;; lookups are cached in a hash table since groveling the group(s) files
;;; is somewhat expensive. The table may hold nil for id's that cannot
;;; be looked up since this means the files are searched in their entirety
;;; each time this id is translated.
;;;
(defun lookup-group-name (gid)
(multiple-value-bind (group-name foundp) (gethash gid *gid-hash-table*)
(if foundp
group-name
(setf (gethash gid *gid-hash-table*)
(get-group-or-user-name :group gid)))))
;;; GET-GROUP-OR-USER-NAME first tries "/etc/passwd" ("/etc/group") since it is
;;; a much smaller file, contains all the local id's, and most uses probably
;;; involve id's on machines one would login into. Then if necessary, we look
;;; in "/etc/passwds" ("/etc/groups") which is really long and has to be
;;; fetched over the net.
;;;
(defun get-group-or-user-name (group-or-user id)
"Returns the simple-string user or group name of the user whose uid or gid
is id, or NIL if no such user or group exists. Group-or-user is either
:group or :user."
(let ((id-string (let ((*print-base* 10)) (prin1-to-string id))))
(declare (simple-string id-string))
(multiple-value-bind (file1 file2)
(ecase group-or-user
(:group (values "/etc/group" "/etc/groups"))
(:user (values "/etc/passwd" "/etc/passwd")))
(or (get-group-or-user-name-aux id-string file1)
(get-group-or-user-name-aux id-string file2)))))
(defun get-group-or-user-name-aux (id-string passwd-file)
(with-open-file (stream passwd-file)
(loop
(let ((entry (read-line stream nil)))
(unless entry (return nil))
(let ((name-end (position #\: (the simple-string entry)
:test #'char=)))
(when name-end
(let ((id-start (position #\: (the simple-string entry)
:start (1+ name-end) :test #'char=)))
(when id-start
(incf id-start)
(let ((id-end (position #\: (the simple-string entry)
:start id-start :test #'char=)))
(when (and id-end
(string= id-string entry
:start2 id-start :end2 id-end))
(return (subseq entry 0 name-end))))))))))))
;;;; File completion.
(defun complete-file (pathname &key (defaults *default-pathname-defaults*)
ignore-types)
(let ((files (directory (complete-file-directory-arg pathname defaults)
:check-for-subdirs nil
:follow-links nil)))
(cond ((null files)
(values nil nil))
((null (cdr files))
(values (merge-pathnames (file-namestring (car files))
pathname)
t))
(t
(let ((good-files
(delete-if #'(lambda (pathname)
(and (simple-string-p
(pathname-type pathname))
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(member (pathname-type pathname)
ignore-types
:test #'string=)))
files)))
(cond ((null good-files))
((null (cdr good-files))
(return-from complete-file
(values (merge-pathnames (file-namestring
(car good-files))
pathname)
t)))
(t
(setf files good-files)))
(let ((common (file-namestring (car files))))
(dolist (file (cdr files))
(let ((name (file-namestring file)))
(dotimes (i (min (length common) (length name))
(when (< (length name) (length common))
(setf common name)))
(unless (char= (schar common i) (schar name i))
(setf common (subseq common 0 i))
(return)))))
(values (merge-pathnames common pathname)
nil)))))))
;;; COMPLETE-FILE-DIRECTORY-ARG -- Internal.
;;;
(defun complete-file-directory-arg (pathname defaults)
(let* ((pathname (merge-pathnames pathname (directory-namestring defaults)))
(type (pathname-type pathname)))
(flet ((append-multi-char-wild (thing)
(etypecase thing
(null :wild)
(pattern
(make-pattern (append (pattern-pieces thing)
(list :multi-char-wild))))
(simple-string
(make-pattern (list thing :multi-char-wild))))))
(if (or (null type) (eq type :unspecific))
;; There is no type.
(make-pathname :defaults pathname
:name (append-multi-char-wild (pathname-name pathname))
:type :wild)
;; There already is a type, so just extend it.
(make-pathname :defaults pathname
:name (pathname-name pathname)
:type (append-multi-char-wild (pathname-type pathname)))))))
;;; Ambiguous-Files -- Public
(defun ambiguous-files (pathname
&optional (defaults *default-pathname-defaults*))
"Return a list of all files which are possible completions of Pathname.
We look in the directory specified by Defaults as well as looking down
the search list."
(directory (complete-file-directory-arg pathname defaults)
:follow-links nil
:check-for-subdirs nil))
;;; File-writable -- exported from extensions.
;;;
;;; Determines whether the single argument (which should be a pathname)
(defun file-writable (name)
"File-writable accepts a pathname and returns T if the current
process can write it, and NIL otherwise."
(let ((name (unix-namestring name nil)))
(cond ((null name)
nil)
((unix:unix-file-kind name)
(values (unix:unix-access name unix:w_ok)))
(t
(values
0
(or (position #\/ name :from-end t)
0))
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;;; Pathname-Order -- Internal
;;;
;;; Predicate to order pathnames by. Goes by name.
;;;
(defun pathname-order (x y)
(let ((xn (%pathname-name x))
(yn (%pathname-name y)))
(if (and xn yn)
(let ((res (string-lessp xn yn)))
(cond ((not res) nil)
((= res (length (the simple-string xn))) t)
((= res (length (the simple-string yn))) nil)
(t t)))
xn)))
;;; Default-Directory -- Public
;;;
(defun default-directory ()
"Returns the pathname for the default directory. This is the place where
a file will be written if no directory is specified. This may be changed
with setf."
(multiple-value-bind (gr dir-or-error)
(let ((*ignore-wildcards* t))
(pathname (concatenate 'simple-string dir-or-error "/")))
;;; %Set-Default-Directory -- Internal
;;;
(defun %set-default-directory (new-val)
(let ((namestring (unix-namestring new-val t)))
(unless namestring
(error "~S doesn't exist." new-val))
(multiple-value-bind (gr error)
(if gr
(setf (search-list "default:") (default-directory))
;;;
(defsetf default-directory %set-default-directory)
(defun filesys-init ()
(setf *default-pathname-defaults*
(%make-pathname *unix-host* nil nil nil nil :newest))
(setf (search-list "default:") (default-directory))
nil)
;;; Ensure-Directories-Exist -- Public
;;;
(defun ensure-directories-exist (pathspec &key verbose (mode #o777))
"Tests whether the directories containing the specified file
actually exist, and attempts to create them if they do not.
Portable programs should avoid using the :MODE keyword argument."
(let* ((pathname (pathname pathspec))
(pathname (if (logical-pathname-p pathname)
(translate-logical-pathname pathname)
pathname))
(created-p nil))
(when (wild-pathname-p pathname)
(error 'simple-file-error
:format-control "Bad place for a wild pathname."
:pathname pathspec))
(enumerate-search-list (pathname pathname)
(let ((dir (pathname-directory pathname)))
(loop for i from 1 upto (length dir)
do (let ((newpath (make-pathname
:host (pathname-host pathname)
:device (pathname-device pathname)
:directory (subseq dir 0 i))))
(unless (probe-file newpath)
(let ((namestring (namestring newpath)))
(when verbose
(format *standard-output* "~&Creating directory: ~A~%"
namestring))
(unix:unix-mkdir namestring mode)
(unless (probe-file namestring)
(error 'simple-file-error
:pathname pathspec
:format-control "Can't create directory ~A."
:format-arguments (list namestring)))
(setf created-p t)))))
;; Only the first path in a search-list is considered.
(return (values pathname created-p))))))