Re: [PATCH 2/2] sh-setup: make require_clean_work_tree() work on orphan branches

["SZEDER Gábor" <szeder@ira.uka.de>]

Quoting Johannes Sixt <j6t@kdbg.org>:

>> --- a/git-sh-setup.sh
>> +++ b/git-sh-setup.sh
>> @@ -200,7 +200,19 @@ require_work_tree () {
>> }
>>
>> require_clean_work_tree () {
>> -	git rev-parse --verify HEAD >/dev/null || exit 1
>> +	if git rev-parse --verify HEAD >/dev/null 2>/dev/null
>> +	then
>> +		compare_to=HEAD
>> +	else
>> +		if [ -z "$ORPHAN_OK" ]
>> +		then
>> +			echo >&2 "Cannot $1: Your current branch does not have any commits yet."
>> +			exit 1
>> +		else
>> +			# SHA1 of an empty tree
>> +			compare_to=4b825dc642cb6eb9a060e54bf8d69288fbee4904
>> +		fi
>> +	fi
>
> It is worrysome that this now throws away any error message of
> rev-parse. A more conservative approach would be to test for -z
> "$ORPHAN_OK" first and entail new behavior only for the "$ORPHAN_OK"
> case.

Those error messages didn't seem to be helpful and in some cases they
were even misleading, e.g.:

    $ git checkout --orphan orphan
    $ git rm -rf .
    $ git script valid-branch
    fatal: Needed a single revision
    $ # Huh?  Didn't I just gave you one?!

Gábor