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streamclone: support for producing and consuming stream clone bundles
Up to this point, stream clones only existed as a dynamically generated
data format produced and consumed during streaming clones. In order to
support this efficient cloning format with the clone bundles feature, we
need a more formal, on disk representation of the streaming clone data.
This patch introduces a new "bundle" type for streaming clones. Unlike
existing bundles, it does not contain changegroup data. It does,
however, share the same concepts like the 4 byte header which identifies
the type of data that follows and the 2 byte abbreviation for
compression types (of which only "UN" is currently supported).
The new bundle format is essentially the existing stream clone version 1
data format with some headers at the beginning.
Content negotiation at stream clone request time checked for repository
format/requirements compatibility before initiating a stream clone. We
can't do active content negotiation when using clone bundles. So, we put
this set of requirements inside the payload so consumers have a built-in
mechanism for checking compatibility before reading and applying lots of
data. Of course, we will also advertise this requirements set in clone
bundles. But that's for another patch.
We currently don't have a mechanism to produce and consume this new
bundle format. This will be implemented in upcoming patches.
It's worth noting that if a legacy client attempts to `hg unbundle` a
stream clone bundle (with the "HGS1" header), it will abort with:
"unknown bundle version S1," which seems appropriate.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 17 Oct 2015 11:14:52 -0700 |
parents | 7de7630053cb |
children |
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;;; mq.el --- Emacs support for Mercurial Queues ;; Copyright (C) 2006 Bryan O'Sullivan ;; Author: Bryan O'Sullivan <bos@serpentine.com> ;; mq.el is free software; you can redistribute it and/or modify it ;; under the terms of the GNU General Public License version 2 or any ;; later version. ;; mq.el is distributed in the hope that it will be useful, but ;; WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;; General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with mq.el, GNU Emacs, or XEmacs; see the file COPYING (`C-h ;; C-l'). If not, see <http://www.gnu.org/licenses/>. (eval-when-compile (require 'cl)) (require 'mercurial) (defcustom mq-mode-hook nil "Hook run when a buffer enters mq-mode." :type 'sexp :group 'mercurial) (defcustom mq-global-prefix "\C-cq" "The global prefix for Mercurial Queues keymap bindings." :type 'sexp :group 'mercurial) (defcustom mq-edit-mode-hook nil "Hook run after a buffer is populated to edit a patch description." :type 'sexp :group 'mercurial) (defcustom mq-edit-finish-hook nil "Hook run before a patch description is finished up with." :type 'sexp :group 'mercurial) (defcustom mq-signoff-address nil "Address with which to sign off on a patch." :type 'string :group 'mercurial) ;;; Internal variables. (defvar mq-mode nil "Is this file managed by MQ?") (make-variable-buffer-local 'mq-mode) (put 'mq-mode 'permanent-local t) (defvar mq-patch-history nil) (defvar mq-top-patch '(nil)) (defvar mq-prev-buffer nil) (make-variable-buffer-local 'mq-prev-buffer) (put 'mq-prev-buffer 'permanent-local t) (defvar mq-top nil) (make-variable-buffer-local 'mq-top) (put 'mq-top 'permanent-local t) ;;; Global keymap. (defvar mq-global-map (let ((map (make-sparse-keymap))) (define-key map "." 'mq-push) (define-key map ">" 'mq-push-all) (define-key map "," 'mq-pop) (define-key map "<" 'mq-pop-all) (define-key map "=" 'mq-diff) (define-key map "r" 'mq-refresh) (define-key map "e" 'mq-refresh-edit) (define-key map "i" 'mq-new) (define-key map "n" 'mq-next) (define-key map "o" 'mq-signoff) (define-key map "p" 'mq-previous) (define-key map "s" 'mq-edit-series) (define-key map "t" 'mq-top) map)) (global-set-key mq-global-prefix mq-global-map) (add-minor-mode 'mq-mode 'mq-mode) ;;; Refresh edit mode keymap. (defvar mq-edit-mode-map (let ((map (make-sparse-keymap))) (define-key map "\C-c\C-c" 'mq-edit-finish) (define-key map "\C-c\C-k" 'mq-edit-kill) (define-key map "\C-c\C-s" 'mq-signoff) map)) ;;; Helper functions. (defun mq-read-patch-name (&optional source prompt force) "Read a patch name to use with a command. May return nil, meaning \"use the default\"." (let ((patches (split-string (hg-chomp (hg-run0 (or source "qseries"))) "\n"))) (when force (completing-read (format "Patch%s: " (or prompt "")) (mapcar (lambda (x) (cons x x)) patches) nil nil nil 'mq-patch-history)))) (defun mq-refresh-buffers (root) (save-excursion (dolist (buf (hg-buffers-visiting-repo root)) (when (not (verify-visited-file-modtime buf)) (set-buffer buf) (let ((ctx (hg-buffer-context))) (message "Refreshing %s..." (buffer-name)) (revert-buffer t t t) (hg-restore-context ctx) (message "Refreshing %s...done" (buffer-name)))))) (hg-update-mode-lines root) (mq-update-mode-lines root)) (defun mq-last-line () (goto-char (point-max)) (beginning-of-line) (when (looking-at "^$") (forward-line -1)) (let ((bol (point))) (end-of-line) (let ((line (buffer-substring bol (point)))) (when (> (length line) 0) line)))) (defun mq-push (&optional patch) "Push patches until PATCH is reached. If PATCH is nil, push at most one patch." (interactive (list (mq-read-patch-name "qunapplied" " to push" current-prefix-arg))) (let ((root (hg-root)) (prev-buf (current-buffer)) last-line ok) (unless root (error "Cannot push outside a repository!")) (hg-sync-buffers root) (let ((buf-name (format "MQ: Push %s" (or patch "next patch")))) (kill-buffer (get-buffer-create buf-name)) (split-window-vertically) (other-window 1) (switch-to-buffer (get-buffer-create buf-name)) (cd root) (message "Pushing...") (setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpush" (if patch (list patch)))) last-line (mq-last-line)) (let ((lines (count-lines (point-min) (point-max)))) (if (or (<= lines 1) (and (equal lines 2) (string-match "Now at:" last-line))) (progn (kill-buffer (current-buffer)) (delete-window)) (hg-view-mode prev-buf)))) (mq-refresh-buffers root) (sit-for 0) (when last-line (if ok (message "Pushing... %s" last-line) (error "Pushing... %s" last-line))))) (defun mq-push-all () "Push patches until all are applied." (interactive) (mq-push "-a")) (defun mq-pop (&optional patch) "Pop patches until PATCH is reached. If PATCH is nil, pop at most one patch." (interactive (list (mq-read-patch-name "qapplied" " to pop to" current-prefix-arg))) (let ((root (hg-root)) last-line ok) (unless root (error "Cannot pop outside a repository!")) (hg-sync-buffers root) (set-buffer (generate-new-buffer "qpop")) (cd root) (message "Popping...") (setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpop" (if patch (list patch)))) last-line (mq-last-line)) (kill-buffer (current-buffer)) (mq-refresh-buffers root) (sit-for 0) (when last-line (if ok (message "Popping... %s" last-line) (error "Popping... %s" last-line))))) (defun mq-pop-all () "Push patches until none are applied." (interactive) (mq-pop "-a")) (defun mq-refresh-internal (root &rest args) (hg-sync-buffers root) (let ((patch (mq-patch-info "qtop"))) (message "Refreshing %s..." patch) (let ((ret (apply 'hg-run "qrefresh" args))) (if (equal (car ret) 0) (message "Refreshing %s... done." patch) (error "Refreshing %s... %s" patch (hg-chomp (cdr ret))))))) (defun mq-refresh (&optional git) "Refresh the topmost applied patch. With a prefix argument, generate a git-compatible patch." (interactive "P") (let ((root (hg-root))) (unless root (error "Cannot refresh outside of a repository!")) (apply 'mq-refresh-internal root (if git '("--git"))))) (defun mq-patch-info (cmd &optional msg) (let* ((ret (hg-run cmd)) (info (hg-chomp (cdr ret)))) (if (equal (car ret) 0) (if msg (message "%s patch: %s" msg info) info) (error "%s" info)))) (defun mq-top () "Print the name of the topmost applied patch." (interactive) (mq-patch-info "qtop" "Top")) (defun mq-next () "Print the name of the next patch to be pushed." (interactive) (mq-patch-info "qnext" "Next")) (defun mq-previous () "Print the name of the first patch below the topmost applied patch. This would become the active patch if popped to." (interactive) (mq-patch-info "qprev" "Previous")) (defun mq-edit-finish () "Finish editing the description of this patch, and refresh the patch." (interactive) (unless (equal (mq-patch-info "qtop") mq-top) (error "Topmost patch has changed!")) (hg-sync-buffers hg-root) (run-hooks 'mq-edit-finish-hook) (mq-refresh-internal hg-root "-m" (buffer-substring (point-min) (point-max))) (let ((buf mq-prev-buffer)) (kill-buffer nil) (switch-to-buffer buf))) (defun mq-edit-kill () "Kill the edit currently being prepared." (interactive) (when (or (not (buffer-modified-p)) (y-or-n-p "Really kill this edit? ")) (let ((buf mq-prev-buffer)) (kill-buffer nil) (switch-to-buffer buf)))) (defun mq-get-top (root) (let ((entry (assoc root mq-top-patch))) (if entry (cdr entry)))) (defun mq-set-top (root patch) (let ((entry (assoc root mq-top-patch))) (if entry (if patch (setcdr entry patch) (setq mq-top-patch (delq entry mq-top-patch))) (setq mq-top-patch (cons (cons root patch) mq-top-patch))))) (defun mq-update-mode-lines (root) (let ((cwd default-directory)) (cd root) (condition-case nil (mq-set-top root (mq-patch-info "qtop")) (error (mq-set-top root nil))) (cd cwd)) (let ((patch (mq-get-top root))) (save-excursion (dolist (buf (hg-buffers-visiting-repo root)) (set-buffer buf) (if mq-mode (setq mq-mode (or (and patch (concat " MQ:" patch)) " MQ"))))))) (defun mq-mode (&optional arg) "Minor mode for Mercurial repositories with an MQ patch queue" (interactive "i") (cond ((hg-root) (setq mq-mode (if (null arg) (not mq-mode) arg)) (mq-update-mode-lines (hg-root)))) (run-hooks 'mq-mode-hook)) (defun mq-edit-mode () "Mode for editing the description of a patch. Key bindings ------------ \\[mq-edit-finish] use this description \\[mq-edit-kill] abandon this description" (interactive) (use-local-map mq-edit-mode-map) (set-syntax-table text-mode-syntax-table) (setq local-abbrev-table text-mode-abbrev-table major-mode 'mq-edit-mode mode-name "MQ-Edit") (set-buffer-modified-p nil) (setq buffer-undo-list nil) (run-hooks 'text-mode-hook 'mq-edit-mode-hook)) (defun mq-refresh-edit () "Refresh the topmost applied patch, editing the patch description." (interactive) (while mq-prev-buffer (set-buffer mq-prev-buffer)) (let ((root (hg-root)) (prev-buffer (current-buffer)) (patch (mq-patch-info "qtop"))) (hg-sync-buffers root) (let ((buf-name (format "*MQ: Edit description of %s*" patch))) (switch-to-buffer (get-buffer-create buf-name)) (when (= (point-min) (point-max)) (set (make-local-variable 'hg-root) root) (set (make-local-variable 'mq-top) patch) (setq mq-prev-buffer prev-buffer) (insert (hg-run0 "qheader")) (goto-char (point-min))) (mq-edit-mode) (cd root))) (message "Type `C-c C-c' to finish editing and refresh the patch.")) (defun mq-new (name) "Create a new empty patch named NAME. The patch is applied on top of the current topmost patch. With a prefix argument, forcibly create the patch even if the working directory is modified." (interactive (list (mq-read-patch-name "qseries" " to create" t))) (message "Creating patch...") (let ((ret (if current-prefix-arg (hg-run "qnew" "-f" name) (hg-run "qnew" name)))) (if (equal (car ret) 0) (progn (hg-update-mode-lines (buffer-file-name)) (message "Creating patch... done.")) (error "Creating patch... %s" (hg-chomp (cdr ret)))))) (defun mq-edit-series () "Edit the MQ series file directly." (interactive) (let ((root (hg-root))) (unless root (error "Not in an MQ repository!")) (find-file (concat root ".hg/patches/series")))) (defun mq-diff (&optional git) "Display a diff of the topmost applied patch. With a prefix argument, display a git-compatible diff." (interactive "P") (hg-view-output ((format "MQ: Diff of %s" (mq-patch-info "qtop"))) (if git (call-process (hg-binary) nil t nil "qdiff" "--git") (call-process (hg-binary) nil t nil "qdiff")) (diff-mode) (font-lock-fontify-buffer))) (defun mq-signoff () "Sign off on the current patch, in the style used by the Linux kernel. If the variable mq-signoff-address is non-nil, it will be used, otherwise the value of the ui.username item from your hgrc will be used." (interactive) (let ((was-editing (eq major-mode 'mq-edit-mode)) signed) (unless was-editing (mq-refresh-edit)) (save-excursion (let* ((user (or mq-signoff-address (hg-run0 "debugconfig" "ui.username"))) (signoff (concat "Signed-off-by: " user))) (if (search-forward signoff nil t) (message "You have already signed off on this patch.") (goto-char (point-max)) (let ((case-fold-search t)) (if (re-search-backward "^Signed-off-by: " nil t) (forward-line 1) (insert "\n"))) (insert signoff) (message "%s" signoff) (setq signed t)))) (unless was-editing (if signed (mq-edit-finish) (mq-edit-kill))))) (provide 'mq) ;;; Local Variables: ;;; prompt-to-byte-compile: nil ;;; end: