Validate if commit exists

Question

How to validate whether the commit with given sha exists in current branch?

There are many ways to parse outputs, but I need optimal way which returns boolean (for u

Answer 1

You can look at the output of

git rev-list HEAD..$sha

If this command fails because the sha1 does not exist at all in the repository, the exit code will be non-zero. If the output is empty, the commit is in the current branch, and if it is non-empty, it is not. So your script would look like

if revlist=`git rev-list HEAD..$sha 2>/dev/null` && [ -z "$revlist" ]; then
    :
fi

In case you already know that $sha really names a commit (as a SHA1 hash or in any other way), this simplifies to

if [ -z "`git rev-list HEAD..$sha`" ]; then
    :
fi