atime mtime)
(sb!unix:unix-stat filename)
(declare (ignore ino nlink gid rdev size atime))
- (if existsp
- (case query-for
- (:existence (nth-value
- 0
- (parse-native-namestring
- filename
- (pathname-host pathname)
- (sane-default-pathname-defaults)
- :as-directory (eql (logand mode sb!unix:s-ifmt)
- sb!unix:s-ifdir))))
- (:truename (nth-value
- 0
- (parse-native-namestring
- ;; Note: in case the file is stat'able, POSIX
- ;; realpath(3) gets us a canonical absolute
- ;; filename, even if the post-merge PATHNAME
- ;; is not absolute...
- (multiple-value-bind (realpath errno)
- (sb!unix:unix-realpath filename)
- (if realpath
- realpath
- (fail "couldn't resolve ~A" filename errno)))
- (pathname-host pathname)
- (sane-default-pathname-defaults)
- ;; ... but without any trailing slash.
- :as-directory (eql (logand mode sb!unix:s-ifmt)
- sb!unix:s-ifdir))))
- (:author (sb!unix:uid-username uid))
- (:write-date (+ unix-to-universal-time mtime)))
- (progn
- ;; SBCL has for many years had a policy that a pathname
- ;; that names an existing, dangling or self-referential
- ;; symlink denotes the symlink itself. stat(2) fails
- ;; and sets errno to ENOENT or ELOOP respectively, but
- ;; we must distinguish cases where the symlink exists
- ;; from ones where there's a loop in the apparent
- ;; containing directory.
- (multiple-value-bind (linkp ignore ino mode nlink uid gid rdev
- size atime mtime)
- (sb!unix:unix-lstat filename)
- (declare (ignore ignore ino mode nlink gid rdev size atime))
- (when (and (or (= errno sb!unix:enoent)
- (= errno sb!unix:eloop))
- linkp)
- (return-from query-file-system
- (case query-for
- (:existence
- ;; We do this reparse so as to return a
- ;; normalized pathname.
- (parse-native-namestring
- filename (pathname-host pathname)))
- (:truename
- ;; So here's a trick: since lstat succeded,
- ;; FILENAME exists, so its directory exists and
- ;; only the non-directory part is loopy. So
- ;; let's resolve FILENAME's directory part with
- ;; realpath(3), in order to get a canonical
- ;; absolute name for the directory, and then
- ;; return a pathname having PATHNAME's name,
- ;; type, and version, but the rest from the
- ;; truename of the directory. Since we turned
- ;; PATHNAME into FILENAME "as a file", FILENAME
- ;; does not end in a slash, and so we get the
- ;; directory part of FILENAME by reparsing
- ;; FILENAME and masking off its name, type, and
- ;; version bits. But note not to call ourselves
- ;; recursively, because we don't want to
- ;; re-merge against *DEFAULT-PATHNAME-DEFAULTS*,
- ;; since PATHNAME may be a relative pathname.
- (merge-pathnames
- (nth-value
- 0
- (parse-native-namestring
- (multiple-value-bind (realpath errno)
- (sb!unix:unix-realpath
- (native-namestring
- (make-pathname
- :name :unspecific
- :type :unspecific
- :version :unspecific
- :defaults (parse-native-namestring
- filename
- (pathname-host pathname)
- (sane-default-pathname-defaults)))))
- (if realpath
- realpath
- (fail "couldn't resolve ~A" filename errno)))
- (pathname-host pathname)
- (sane-default-pathname-defaults)
- :as-directory t))
- pathname))
- (:author (sb!unix:uid-username uid))
- (:write-date (+ unix-to-universal-time mtime))))))
- ;; If we're still here, the file doesn't exist; error.
- (fail
- (format nil "failed to find the ~A of ~~A" query-for)
- pathspec errno))))))))
+ (labels ((parse (filename &key (as-directory
+ (eql (logand mode
+ sb!unix:s-ifmt)
+ sb!unix:s-ifdir)))
+ (values
+ (parse-native-namestring
+ filename
+ (pathname-host pathname)
+ (sane-default-pathname-defaults)
+ :as-directory as-directory)))
+ (resolve-problematic-symlink (&optional realpath-failed)
+ ;; SBCL has for many years had a policy that a pathname
+ ;; that names an existing, dangling or self-referential
+ ;; symlink denotes the symlink itself. stat(2) fails
+ ;; and sets errno to ENOENT or ELOOP respectively, but
+ ;; we must distinguish cases where the symlink exists
+ ;; from ones where there's a loop in the apparent
+ ;; containing directory.
+ ;; Also handles symlinks in /proc/pid/fd/ to
+ ;; pipes or sockets on Linux
+ (multiple-value-bind (linkp ignore ino mode nlink uid gid rdev
+ size atime mtime)
+ (sb!unix:unix-lstat filename)
+ (declare (ignore ignore ino mode nlink gid rdev size atime))
+ (when (and (or (= errno sb!unix:enoent)
+ (= errno sb!unix:eloop)
+ realpath-failed)
+ linkp)
+ (return-from query-file-system
+ (case query-for
+ (:existence
+ ;; We do this reparse so as to return a
+ ;; normalized pathname.
+ (parse filename :as-directory nil))
+ (:truename
+ ;; So here's a trick: since lstat succeded,
+ ;; FILENAME exists, so its directory exists and
+ ;; only the non-directory part is loopy. So
+ ;; let's resolve FILENAME's directory part with
+ ;; realpath(3), in order to get a canonical
+ ;; absolute name for the directory, and then
+ ;; return a pathname having PATHNAME's name,
+ ;; type, and version, but the rest from the
+ ;; truename of the directory. Since we turned
+ ;; PATHNAME into FILENAME "as a file", FILENAME
+ ;; does not end in a slash, and so we get the
+ ;; directory part of FILENAME by reparsing
+ ;; FILENAME and masking off its name, type, and
+ ;; version bits. But note not to call ourselves
+ ;; recursively, because we don't want to
+ ;; re-merge against *DEFAULT-PATHNAME-DEFAULTS*,
+ ;; since PATHNAME may be a relative pathname.
+ (merge-pathnames
+ (parse
+ (multiple-value-bind (realpath errno)
+ (sb!unix:unix-realpath
+ (native-namestring
+ (make-pathname
+ :name :unspecific
+ :type :unspecific
+ :version :unspecific
+ :defaults (parse filename
+ :as-directory nil))))
+ (or realpath
+ (fail "couldn't resolve ~A" filename errno)))
+ :as-directory t)
+ pathname))
+ (:author (sb!unix:uid-username uid))
+ (:write-date (+ unix-to-universal-time mtime))))))
+ ;; If we're still here, the file doesn't exist; error.
+ (fail
+ (format nil "failed to find the ~A of ~~A" query-for)
+ pathspec errno)))
+ (if existsp
+ (case query-for
+ (:existence (parse filename))
+ (:truename
+ ;; Note: in case the file is stat'able, POSIX
+ ;; realpath(3) gets us a canonical absolute
+ ;; filename, even if the post-merge PATHNAME
+ ;; is not absolute
+ (parse (or (sb!unix:unix-realpath filename)
+ (resolve-problematic-symlink t))))
+ (:author (sb!unix:uid-username uid))
+ (:write-date (+ unix-to-universal-time mtime)))
+ (resolve-problematic-symlink))))))))
(defun probe-file (pathspec)
projects / sbcl.git / commitdiff