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Add function to roll back elpa directory

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This commit is contained in:
Wojciech Kozlowski 2018-11-03 16:09:44 +00:00
parent 53e413126c
commit 7e63972553
1 changed files with 38 additions and 6 deletions
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44
emodule/emodule.el
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@ -151,20 +151,52 @@ after attempting to install all other packages first."
(defun emodule/backup ()
"Create a backup of the elpa directory in elpa.tar.xz."
(let* ((dir "elpa")
(let* ((default-directory "~/.emacs.d")
(dir "elpa")
(archive (format "%s.tar.xz" dir)))
(emodule/unset-logs-read-only)
(emodule/print (format "*** Creating backup of %s ***\n" dir) emodule/log)
(let* ((default-directory "~/.emacs.d")
(cmd (format "XZ_OPT=-9 tar -cJf %s %s" archive dir))
(emodule/print (format "Creating backup of %s into %s\n" dir archive)
emodule/log)
(let* ((cmd (format "XZ_OPT=-9 tar -cJf %s %s" archive dir))
(res (shell-command cmd nil emodule/error-log)))
(unless (zerop res)
(progn
(emodule/print "*** Failed to create backup ***" emodule/log)
(emodule/print "Failed to create backup" emodule/log)
(delete-file archive)
(emodule/set-logs-read-only)
(error (format "Command: '%s' failed with code %d" cmd res)))))
(emodule/print (format "*** Backup created in %s ***" archive) emodule/log)
(emodule/print (format "Backup created in %s" archive) emodule/log)
(emodule/set-logs-read-only)))
(defun emodule/clean-move-dir (dir1 dir2)
"Move DIR1 to DIR2 after ensuring DIR2 does not exist."
(when (file-directory-p dir2)
(delete-directory dir2 t))
(rename-file dir1 dir2))
(defun emodule/rollback ()
"Rollback to elpa directory state from backup."
(let* ((default-directory "~/.emacs.d")
(dir "elpa")
(dir-bkp (format "%s.bkp" dir))
(archive (format "%s.tar.xz" dir)))
(emodule/unset-logs-read-only)
(emodule/print (format "Rolling %s back from %s\n" dir archive)
emodule/log)
(when (file-directory-p dir)
(emodule/clean-move-dir dir dir-bkp))
(let* ((cmd (format "tar -xJf %s" archive))
(res (shell-command cmd nil emodule/error-log)))
(unless (zerop res)
(progn
(emodule/print "Failed to rollback" emodule/log)
(when (file-directory-p dir-bkp)
(emodule/clean-move-dir dir-bkp dir))
(emodule/set-logs-read-only)
(error (format "Command: '%s' failed with code %d" cmd res)))))
(emodule/print (format "Rolled back from %s" archive) emodule/log)
(when (file-directory-p dir-bkp)
(delete-directory dir-bkp t))
(emodule/set-logs-read-only)))
;;; Package management functions