Backup git dirs and workdir to remote

diff --git a/backup_git_dirs b/backup_git_dirs
new file mode 100755 (executable)
index 0000000..9822bab
--- /dev/null
+++ b/backup_git_dirs
@@ -0,0 +1,70 @@
+#!/bin/bash
+# The MIT License (MIT)
+# 
+# Copyright (c) 2011-2016 Ismaël Bouya http://www.normalesup.org/~bouya/
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+REMOTE=origin
+REF_NS=auto_backup
+
+function backup_refs() {
+  pushd "$1" > /dev/null
+
+  if git rev-parse --git-dir > /dev/null 2>&1; then
+    git for-each-ref --format='%(refname)' refs/$REF_NS | while read ref; do
+      git update-ref -d "$ref"
+    done
+
+    git for-each-ref --format='%(refname)' refs/heads refs/tags | while read ref; do
+      new_ref=$(echo "$ref" | sed -e "s@^refs/@refs/$REF_NS/@")
+      git update-ref $new_ref $ref
+    done
+
+    stash=0
+    git reflog --pretty=tformat:'%H' refs/stash 2>/dev/null | while read ref; do
+      git update-ref refs/$REF_NS/stash/stash_$stash $ref
+      stash=$(($stash + 1))
+    done
+
+    export GIT_INDEX_FILE=`mktemp /tmp/git-backup-index.XXXXXX`
+    git read-tree HEAD
+    head_commit=$(git show-ref --hash --head ^HEAD)
+    git add .
+    COMMIT=`git commit-tree $(git write-tree) -p $head_commit -m "Automatic backup"`
+    git update-ref refs/$REF_NS/workdir $COMMIT
+    rm -f "$GIT_INDEX_FILE"
+    unset GIT_INDEX_FILE
+
+    if git remote | grep -q "^$REMOTE$"; then
+      git push -q --force $REMOTE "refs/$REF_NS/*:refs/$REF_NS/*"
+      git for-each-ref --format='%(refname)' refs/$REF_NS | while read ref; do
+        git update-ref -d "$ref"
+      done
+      # Pour récupérer: 
+      # git fetch $REMOTE --force "refs/$REF_NS/*:refs/$REF_NS/*"
+    fi
+  fi
+
+  popd > /dev/null
+}
+
+for directory in "$@"; do
+  backup_refs $directory
+done