[RFC PATCH] hooks: add some defaults to support sane workflow to pre-commit

[Heiko Voigt <git-list@hvoigt.net>]

It sometimes happens that you move to a new machine and forget to setup your
name and email address. To find this out after 10 commits can be quite
frustrating.

As far as I know all "sane" workflows involve topic branches, so
normally a developer will never commit directly on master but use topic
branch instead and merge them into master once finished.

One thing which could be dangerous is if you clone a project containing
submodules. If you would immediately start working in a submodule you
would create commits with detached head. This can be a dangerous operation
in terms of loosing commits and should be forbidden by default.

Signed-off-by: Heiko Voigt <git-list@hvoigt.net>
---

I also would like to vote for enabling some hooks by default. 

 templates/hooks--pre-commit.sample |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/templates/hooks--pre-commit.sample b/templates/hooks--pre-commit.sample
index 0e49279..6360da0 100755
--- a/templates/hooks--pre-commit.sample
+++ b/templates/hooks--pre-commit.sample
@@ -16,3 +16,26 @@ else
 fi
 
 exec git diff-index --check --cached $against --
+
+# check if username and email are setup
+if [ -z "$(git config --global user.name)" ]; then
+    echo "Please set your name and email address"
+    exit 1
+fi
+if [ -z "$(git config --global user.email)" ]; then
+    echo "Please set your name and email address"
+    exit 1
+fi
+
+# work should always be done on a feature branch
+if git branch | grep "^* master" > /dev/null; then
+    echo "No commits on master, please !"
+    exit 1
+fi
+
+# do not allow commits on detached head
+if git branch | grep "^* (no branch)" > /dev/null; then
+    echo "Commit on detached HEAD is dangerous !"
+    echo "Please checkout a branch first ..."
+    exit 1
+fi
-- 
1.6.1.2.390.gba743