add GIT:SNAPSHOT-EXTRACTED

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

4 files changed, 65 insertions, 0 deletions

diff --git a/consfigurator.asd b/consfigurator.asd
index 5cf18cc..2f5ac38 100644
--- a/consfigurator.asd
+++ b/consfigurator.asd
@@ -31,6 +31,7 @@
                (:file "src/property/apt")
                (:file "src/property/chroot")
                (:file "src/property/user")
+               (:file "src/property/git")
                (:file "src/connection/shell-wrap")
 	       (:file "src/connection/fork")
                (:file "src/connection/ssh")
diff --git a/src/connection.lisp b/src/connection.lisp
index b993761..56f2985 100644
--- a/src/connection.lisp
+++ b/src/connection.lisp
@@ -327,6 +327,17 @@ start with RUN."
 (defun test (&rest args)
   (zerop (apply #'mrun :for-exit "test" args)))
 
+(defun delete-remote-tree (&rest paths)
+  "Recursively delete each of PATHS."
+  (mrun "rm" "-rf" paths))
+
+(defun remote-exists-p (&rest paths)
+  "Does each of PATHS exists?
+PATH may be any kind of file, including directories."
+  (test (loop for path on paths
+              nconc (list "-e" (car path))
+              when (cdr path) collect "-a")))
+
 (defun readfile (&rest args)
   (apply #'connection-readfile *connection* args))
 
diff --git a/src/package.lisp b/src/package.lisp
index 0f33b7d..2c6afd8 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -91,6 +91,8 @@
            #:run-failed
            #:runlines
            #:test
+           #:remote-exists-p
+           #:delete-remote-tree
            #:readfile
            #:writefile
 
@@ -274,6 +276,11 @@
 (defpackage :consfigurator.property.gnupg
   (:use #:cl #:consfigurator))
 
+(defpackage :consfigurator.property.git
+  (:use #:cl #:consfigurator)
+  (:local-nicknames (#:file      #:consfigurator.property.file))
+  (:export #:snapshot-extracted))
+
 (defpackage :consfigurator.connection.shell-wrap
   (:use #:cl #:consfigurator)
   (:export #:shell-wrap-connection #:connection-shell-wrap))
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)))