add GIT:SNAPSHOT-EXTRACTED

Signed-off-by: Sean Whitton <spwhitton@spwhitton.name>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/property/git.lisp b/src/property/git.lisp
new file mode 100644
index 0000000..6434575
--- /dev/null
+++ b/src/property/git.lisp
@@ -0,0 +1,46 @@
+;;; Consfigurator -- Lisp declarative configuration management system
+
+;;; Copyright (C) 2020-2021  Sean Whitton <spwhitton@spwhitton.name>
+
+;;; This file is free software; you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3, or (at your option)
+;;; any later version.
+
+;;; This file 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+(in-package :consfigurator.property.git)
+(named-readtables:in-readtable :consfigurator)
+
+(defprop snapshot-extracted :posix
+    (directory snapshot-name
+               &key replace
+               &aux (dest
+                     (merge-pathnames snapshot-name
+                                      (ensure-directory-pathname directory))))
+  "Extract a tarball as produced by DATA:GIT-SNAPSHOT under DIRECTORY.
+If REPLACE, delete and replace the snapshot (or anything else) that already
+exists at DIRECTORY/SNAPSHOT-NAME.  This is useful to ensure the latest
+available version of the snapshot is present on the remote system."
+  ;; TODO Keyword argument to replace only if a newer version of the
+  ;; prerequisite data is available.
+  (:desc (declare (ignore replace dest))
+         #?"git snapshot ${snapshot-name} extracted")
+  (:hostattrs (declare (ignore replace dest))
+              (require-data "--git-snapshot" snapshot-name))
+  (:check (and (not replace) (remote-exists-p dest)))
+  (:apply
+   (declare (ignore replace))
+   (delete-remote-tree dest)
+   (file:directory-exists directory)
+   (mrun :input (get-data-stream "--git-snapshot" snapshot-name)
+         #?"cd '${directory}'; tar xfz -"))
+  (:unapply
+   (declare (ignore replace))
+   (delete-remote-tree dest)))