tools: Add git utility scripts.

tools/deploy-branch

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+function error_out {
+    echo -en '\e[0;31m'
+    echo "$1"
+    echo -en '\e[0m'
+    exit 1
+}
+
+status=$(git status --porcelain | grep -v '^??')
+[ ! -z "$status" ] && error_out "Working directory or index not clean"
+
+old_ref=$(git rev-list --max-count=1 HEAD)
+branch=$1
+branch_ref=$(git rev-list --max-count=1 "$branch")
+
+[ $? -ne 0 ] && error_out "Unknown branch: $branch"
+
+if [ "$old_ref" == "$branch_ref" ]; then
+    new_ref=master
+else
+    ref_name=$(git describe --all --exact "$old_ref")
+    if [ $? -eq 0 ]; then
+        new_ref=$(echo "$ref_name" | perl -pe 's{^(heads|remotes)/}{}')
+    else
+        new_ref=$old_ref
+    fi
+fi
+
+[ -z "$branch" ] && error_out "You must specify a branch name to deploy"
+
+git fetch -p
+
+git rebase origin/master "$branch"
+[ $? -ne 0 ] && error_out "Rebase onto origin/master failed"
+
+git push . HEAD:master
+git push origin master
+[ $? -ne 0 ] && error_out "Push of master to origin/master failed"
+
+git checkout "$new_ref"
+git branch -D "$branch"
+git push origin ":$branch"