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#!/bin/bash
#
# Checkout a branch in a submodule whose latest commit is the given branch and
# checkout to that branch.
#
# Intended to run only in development environments. In production, always use
# "git submodule update" only.
#
# There are a git-submodule feature to help tracking subdmoule branches:
#
# Git submodules: Specify a branch/tag - Stack Overflow
# https://stackoverflow.com/questions/1777854/git-submodules-specify-a-branch-tag
#
# But note that using "git submodule add -b" coupled with "git submodule update --remote"
# does not leverage the additional security of using the commit ID of the submodule's
# commit recoreded in the parent commit.
#
# Given that the benefits of using git-submodule is both tracking sub-repository state
# and ensuring a basic integrity check on it's contents, the following implementation
# is different from the sollution given by the article above by ensuring we only checkout
# to the branch if it's latest commit is the one having the revision recorded by the parent
# repository.
# Parameters
BASENAME="`basename $0`"
# Checkout the branch containing a commit
function checkout_branch {
# Check if we are in a detached HEAD
if git branch | grep -q '* (HEAD detached'; then
# Determine the commit we're in
local commit="`git log -n 1 | head -1 | cut -d ' ' -f 2`"
# Get all branches were the commit occurs
local branches="`git branch -r --contains $commit 2> /dev/null | grep -v 'HEAD'`"
# Get the first branch whose last commit is our commit
if [ ! -z "$branches" ]; then
for branch in $branches; do
branch_commit="`git log $branch -1 | head -1 | cut -d ' ' -f 2`"
# In the future some criteria might be stablished to determine how to decide
# if the comment is present in more than one branch. Which one to prioritize?
#
# - A branch recorded in `config -f $toplevel/.gitmodules submodule.$name.branch`?
# - A topic branch in the form of "feature/"?
# - The "develop" branch?
#
# This whole business is getting too complicated!
if [ "$commit" == "$branch_commit" ]; then
# Remove an eventual remote name from branch name
local_branch="`echo $branch | sed -e 's|^[^/]*/||'`"
# Get the commit of the local branch for the case the matching branch is a remote one
if git branch | grep -q " $local_branch$"; then
local_commit="`git log $local_branch -1 | head -1 | cut -d ' ' -f 2`"
else
# Branch does not exist
local_commit="$branch_commit"
fi
# Checkout to the given commit
#
# Note that there's space for a race condition here during this
# checkout and the merge from the next statement block.
#
# So be careful and use this script just in development.
git checkout $local_branch
# Update the local branch if needed
if [ "$branch_commit" != "$local_commit" ]; then
git merge $branch
fi
# Done
break
fi
done
else
echo "$BASENAME: no such branch containing $commit as it's latest commit"
fi
fi
}
# Dispatch
checkout_branch
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