From 3d6208f5b5b2877f277fc80419020427ab03b978 Mon Sep 17 00:00:00 2001
From: Tony Duckles <tony@nynim.org>
Date: Wed, 23 Jan 2013 19:17:09 -0600
Subject: [PATCH] bin/git-subup: Init child submodules, optionally pull

Refactor the 'git-subup' (submodule update) script to only
conditionally pull changes from each submodule's origin remote.

"git subup" will just ensure all submodules are checked-out.
"git subup pull" will additionally do a pull on each submodule to
look for updates.

* Use '--recursive' flag for update/sync/foreach subcommands to
  update any child submodules of first-level submodules.
* Conditionalize 'git pull' handling only if $1 == "pull".
* Don't assume that "remotes/origin/HEAD" is a valid ref; not all
  repo's will have an "origin/HEAD" ref. Instead, just force-update
  local "master" branch based on the current checked-out rev, so
  that when 'git submodule update --checkout' creates a detached
  HEAD we'll update our local 'master' branch to jive with HEAD so
  that any later 'git pull' will show all new revisions compared to
  the previous HEAD.
---
 bin/git-subup | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/bin/git-subup b/bin/git-subup
index aec9632..52d4f09 100755
--- a/bin/git-subup
+++ b/bin/git-subup
@@ -1,8 +1,22 @@
-#!/bin/sh
-# Checkout and update source for all registered submodules (.gitmodules)
+#!/bin/bash
+# Checkout and update source for all registered submodules (.gitmodules).
+# Optionally 'git pull' on each submodule to check for updates.
 
+# Change to root directory
 cd $(git rev-parse --show-toplevel)
-git submodule update --init --checkout --quiet
-git submodule sync --quiet
-git submodule foreach --quiet git checkout --quiet -B master origin/HEAD
-git submodule foreach git pull --prune origin
+
+# Ensure all submodules (and child submodules) are checked-out
+git submodule update --init --checkout --recursive
+
+# Update submodules' remotes based on .gitmodules
+git submodule sync --quiet --recursive
+
+# Forcibly update each submodule's "master" branch to be the current revision
+# in case HEAD is detached (e.g. due to "git submodule update --checkout")
+git submodule foreach --quiet --recursive 'git checkout --quiet -B master'
+
+if [ "$1" = "pull" ]; then
+    # Fetch & pull any new updates from submodule's origin (but *NOT* any child
+    # submodule updates -- those should come from the submodule proper)
+    git submodule foreach --quiet 'echo "\n\033[32m${path}:\033[0m" && git-up origin'
+fi
-- 
2.45.2