Re: GIT_DIR in aliases [Re: Spurious GIT_DIR set when in a worktree [was Re: Nested submodule status bug]

From: Damien Robert <damien.olivier.robert@gmail.com>
Date: Mar 3, 2020, 21:56 UTC
Message-ID: <20200303215650.vpsfgcjrsv42dqob@doriath>
In-Reply-To: <6D4FEE68-EF3C-491E-A7C1-3454B88977C3@gmail.com>

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> If that’s what your are trying to do, ‘git submodule foreach’ [1] seems like a better way to go. 
> For example I have an alias ‘st-sub’ that calls git status in the superproject and then recursively in the submodules:
> 
>     $ cat ~/.gitconfig | grep st-sub
>           st-sub = !git status "$@" && git sub foreach --recursive git status "$@"

I have almost the same aliases :)
	s = status --short --branch
	subfor="submodule foreach --recursive"
	subs="!f() { git subfor git s \"$@\";}; f"
	recs="!f() { git s \"$@\"; git subs \"$@\";}; f"

But in practice I often want to run commands only in *changed* submodules.

For instance with the above 'git subs' yields a lot of non informative
messages like:
  Entering 'non/changed/submodule'
  ## master...origin/master
(and git foreach --quiet) removes the first line but not the second.

This is also useful for an alias like 'recursive_commit' where I only want
to commit changed submodules, to not get a lot of messages like
     nothing to commit, working tree clean.

So I wrote a script that parses the output of 'git status --porcelain=v2' and run a command only in changed submodules (where I can specify if changed means 'C', 'M' or 'U'). Except that I did not think about unseting GIT_DIR and stumbled into this bug (I am sorry I went a bit on a wild chase in this mailing list but I had already spent quite some time in trying to find a minimal exemple, I first thought that my program had a parsing bug).

Now that I think about it, I probably also could do that with 'git submodule foreach', by testing 'git diff --no-ext-diff [--cached] --quiet' first before running the subcommand. This would give me the 'M' submodules, but it is not clear to me how I could test for 'C' changed submodules with this method.

-- 
Damien Robert
http://www.normalesup.org/~robert/pro