+If nil, no PGP verification is done. If the package index database
+entries are not PGP signed and this variable is non-nil, require user
+confirmation to continue with the package-get procedure."
+ :type 'boolean
+ :group 'package-get)
+
+(defvar package-entries-are-signed nil
+ "Non-nil when the package index file has been PGP signed.")
+
+(defvar package-get-continue-update-base nil
+ "Non-nil update the index even if it hasn't been signed.")
+
+(defvar package-get-was-current nil
+ "Non-nil we did our best to fetch a current database.")
+
+;;;###autoload
+(defun package-get-require-base (&optional force-current)
+ "Require that a package-get database has been loaded.
+If the optional FORCE-CURRENT argument or the value of
+`package-get-always-update' is Non-nil, try to update the database
+from a location in `package-get-remote'. Otherwise a local copy is used
+if available and remote access is never done.
+
+Please use FORCE-CURRENT only when the user is explictly dealing with packages
+and remote access is likely in the near future."
+ (setq force-current (or force-current package-get-always-update))
+ (unless (and (boundp 'package-get-base)
+ package-get-base
+ (or (not force-current) package-get-was-current))
+ (package-get-update-base nil force-current))
+ (if (or (not (boundp 'package-get-base))
+ (not package-get-base))
+ (error 'void-variable
+ "Package-get database not loaded")
+ (setq package-get-was-current force-current)))
+
+(defconst package-get-pgp-signed-begin-line "^-----BEGIN PGP SIGNED MESSAGE-----"
+ "Text for start of PGP signed messages.")
+(defconst package-get-pgp-signature-begin-line "^-----BEGIN PGP SIGNATURE-----"
+ "Text for beginning of PGP signature.")
+(defconst package-get-pgp-signature-end-line "^-----END PGP SIGNATURE-----"
+ "Text for end of PGP signature.")
+
+;;;###autoload
+(defun package-get-update-base-entry (entry)
+ "Update an entry in `package-get-base'."
+ (let ((existing (assq (car entry) package-get-base)))
+ (if existing
+ (setcdr existing (cdr entry))
+ (setq package-get-base (cons entry package-get-base)))))
+
+(defun package-get-locate-file (file &optional nil-if-not-found no-remote)
+ "Locate an existing FILE with respect to `package-get-remote'.
+If FILE is an absolute path or is not found, simply return FILE.
+If optional argument NIL-IF-NOT-FOUND is non-nil, return nil
+if FILE can not be located.
+If NO-REMOTE is non-nil never search remote locations."
+ (if (file-name-absolute-p file)
+ file
+ (let ((site package-get-remote)
+ (expanded nil))
+ (when site
+ (unless (and no-remote (caar (list site)))
+ (let ((expn (package-get-remote-filename (car (list site)) file)))
+ (if (and expn (file-exists-p expn))
+ (setq site nil
+ expanded expn)))))
+ (or expanded
+ (and (not nil-if-not-found)
+ file)))))
+
+(defun package-get-locate-index-file (no-remote)
+ "Locate the package-get index file.
+
+Do not return remote paths if NO-REMOTE is non-nil. If the index
+file doesn't exist in `package-get-package-index-file-location', ask
+the user if one should be created using the index file in core as a
+template."
+ (or (package-get-locate-file package-get-base-filename t no-remote)
+ (if (file-exists-p (expand-file-name package-get-base-filename
+ package-get-package-index-file-location))
+ (expand-file-name package-get-base-filename
+ package-get-package-index-file-location)
+ (if (y-or-n-p (format "No index file, shall I create one in %s? "
+ package-get-package-index-file-location))
+ (progn
+ (save-excursion
+ (set-buffer
+ (find-file-noselect (expand-file-name
+ package-get-base-filename
+ package-get-package-index-file-location)))
+ (let ((coding-system-for-write 'binary))
+ (erase-buffer)
+ (insert-file-contents-literally
+ (locate-data-file package-get-base-filename))
+ (save-buffer (current-buffer))
+ (kill-buffer (current-buffer))))
+ (expand-file-name package-get-base-filename
+ package-get-package-index-file-location))
+ (error 'search-failed
+ "Can't locate a package index file.")))))
+
+(defun package-get-maybe-save-index (filename)
+ "Offer to save the current buffer as the local package index file,
+if different."
+ (let ((location (package-get-locate-index-file t)))
+ (unless (and filename (equal filename location))
+ (unless (and location
+ (equal (md5 (current-buffer))
+ (with-temp-buffer
+ (insert-file-contents-literally location)
+ (md5 (current-buffer)))))
+ (when (not (file-writable-p location))
+ (if (y-or-n-p (format "Sorry, %s is read-only, can I use %s? "
+ location user-init-directory))
+ (setq location (expand-file-name
+ package-get-base-filename
+ package-get-package-index-file-location))
+ (error 'file-error
+ (format "%s is read-only" location))))
+ (when (y-or-n-p (concat "Update package index in " location "? "))
+ (let ((coding-system-for-write 'binary))
+ (write-file location)))))))
+
+;;;###autoload
+(defun package-get-update-base (&optional db-file force-current)
+ "Update the package-get database file with entries from DB-FILE.
+Unless FORCE-CURRENT is non-nil never try to update the database."
+ (interactive
+ (let ((dflt (package-get-locate-index-file nil)))
+ (list (read-file-name "Load package-get database: "
+ (file-name-directory dflt)
+ dflt
+ t
+ (file-name-nondirectory dflt)))))
+ (setq db-file (expand-file-name (or db-file
+ (package-get-locate-index-file
+ (not force-current)))))
+ (if (not (file-exists-p db-file))
+ (error 'file-error
+ (format "Package-get database file `%s' does not exist" db-file)))
+ (if (not (file-readable-p db-file))
+ (error 'file-error
+ (format "Package-get database file `%s' not readable" db-file)))
+ (let ((buf (get-buffer-create "*package database*")))
+ (unwind-protect
+ (save-excursion
+ (set-buffer buf)
+ (erase-buffer buf)
+ (insert-file-contents-literally db-file)
+ (package-get-update-base-from-buffer buf)
+ (if (file-remote-p db-file)
+ (package-get-maybe-save-index db-file)))
+ (kill-buffer buf))))
+
+;; This is here because the `process-error' datum doesn't exist in
+;; 21.4. --SY.
+(define-error 'process-error "Process error")
+
+;;;###autoload
+(defun package-get-update-base-from-buffer (&optional buf)
+ "Update the package-get database with entries from BUFFER.
+BUFFER defaults to the current buffer. This command can be
+used interactively, for example from a mail or news buffer."
+ (interactive)
+ (setq buf (or buf (current-buffer)))
+ (let ((coding-system-for-read 'binary)
+ (coding-system-for-write 'binary)
+ content-beg content-end)
+ (save-excursion
+ (set-buffer buf)
+ (goto-char (point-min))
+ (setq content-beg (point))
+ (setq content-end (save-excursion (goto-char (point-max)) (point)))
+ (when (re-search-forward package-get-pgp-signed-begin-line nil t)
+ (setq content-beg (match-end 0)))
+ (when (re-search-forward package-get-pgp-signature-begin-line nil t)
+ (setq content-end (match-beginning 0))
+ (setq package-entries-are-signed t))
+ (re-search-forward package-get-pgp-signature-end-line nil t)
+ (setq package-get-continue-update-base t)
+ ;; This is a little overkill because the default value of
+ ;; `package-get-require-signed-base-updates' is the return of
+ ;; `package-get-pgp-available-p', but we have to allow for
+ ;; someone explicitly setting
+ ;; `package-get-require-signed-base-updates' to t. --SY
+ (when (and package-get-require-signed-base-updates
+ (package-get-pgp-available-p))
+ (if package-entries-are-signed
+ (let (good-sig)
+ (setq package-get-continue-update-base nil)
+ (autoload 'mc-verify "mc-toplev")
+ (when (mc-verify)
+ (setq good-sig t))
+ (if good-sig
+ (setq package-get-continue-update-base t)
+ (error 'process-error
+ "GnuPG error. Package database not updated")))
+ (if (yes-or-no-p
+ "Package Index is not PGP signed. Continue anyway? ")
+ (setq package-get-continue-update-base t)
+ (setq package-get-continue-update-base nil)
+ (warn "Package database not updated"))))
+ ;; ToDo: We should call package-get-maybe-save-index on the region
+ (when package-get-continue-update-base
+ (package-get-update-base-entries content-beg content-end)
+ (message "Updated package database")))))
+
+(defun package-get-update-base-entries (start end)
+ "Update the package-get database with the entries found between
+START and END in the current buffer."
+ (save-excursion
+ (goto-char start)
+ (if (not (re-search-forward "^(package-get-update-base-entry" nil t))
+ (error 'search-failed
+ "Buffer does not contain package-get database entries"))
+ (beginning-of-line)
+ (let ((count 0))
+ (while (and (< (point) end)
+ (re-search-forward "^(package-get-update-base-entry" nil t))
+ (beginning-of-line)
+ (let ((entry (read (current-buffer))))
+ (if (or (not (consp entry))
+ (not (eq (car entry) 'package-get-update-base-entry)))
+ (error 'syntax-error
+ "Invalid package-get database entry found"))
+ (package-get-update-base-entry
+ (car (cdr (car (cdr entry)))))
+ (setq count (1+ count))))
+ (message "Got %d package-get database entries" count))))
+
+;;;###autoload
+(defun package-get-save-base (file)
+ "Write the package-get database to FILE.
+
+Note: This database will be unsigned of course."
+ (interactive "FSave package-get database to: ")
+ (package-get-require-base t)
+ (let ((buf (get-buffer-create "*package database*")))
+ (unwind-protect
+ (save-excursion
+ (set-buffer buf)
+ (erase-buffer buf)
+ (goto-char (point-min))
+ (let ((entries package-get-base) entry plist)
+ (insert ";; Package Index file -- Do not edit manually.\n")
+ (insert ";;;@@@\n")
+ (while entries
+ (setq entry (car entries))
+ (setq plist (car (cdr entry)))
+ (insert "(package-get-update-base-entry (quote\n")
+ (insert (format "(%s\n" (symbol-name (car entry))))
+ (while plist
+ (insert (format " %s%s %S\n"
+ (if (eq plist (car (cdr entry))) "(" " ")
+ (symbol-name (car plist))
+ (car (cdr plist))))
+ (setq plist (cdr (cdr plist))))
+ (insert "))\n))\n;;;@@@\n")
+ (setq entries (cdr entries))))
+ (insert ";; Package Index file ends here\n")
+ (write-region (point-min) (point-max) file))
+ (kill-buffer buf))))
+
+(defun package-get-interactive-package-query (get-version package-symbol)
+ "Perform interactive querying for package and optional version.
+Query for a version if GET-VERSION is non-nil. Return package name as
+a symbol instead of a string if PACKAGE-SYMBOL is non-nil.
+The return value is suitable for direct passing to `interactive'."
+ (package-get-require-base t)
+ (let ((table (mapcar #'(lambda (item)
+ (let ((name (symbol-name (car item))))
+ (cons name name)))
+ package-get-base))
+ package package-symbol default-version version)
+ (save-window-excursion
+ (setq package (completing-read "Package: " table nil t))
+ (setq package-symbol (intern package))
+ (if get-version
+ (progn
+ (setq default-version
+ (package-get-info-prop
+ (package-get-info-version
+ (package-get-info-find-package package-get-base
+ package-symbol) nil)
+ 'version))
+ (while (string=
+ (setq version (read-string "Version: " default-version))
+ ""))
+ (if package-symbol
+ (list package-symbol version)
+ (list package version)))
+ (if package-symbol
+ (list package-symbol)
+ (list package))))))
+
+;;;###autoload
+(defun package-get-delete-package (package &optional pkg-topdir)
+ "Delete an installation of PACKAGE below directory PKG-TOPDIR.
+PACKAGE is a symbol, not a string.
+This is just an interactive wrapper for `package-admin-delete-binary-package'."
+ (interactive (package-get-interactive-package-query nil t))
+ (package-admin-delete-binary-package package pkg-topdir))