Re: [PATCH 1/3] Use startup_info->prefix rather than prefix.

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Nguyen Thai Ngoc Duy <pclouds@xxxxxxxxx> writes:

> This patch makes this function only usable when startup_info pointer
> is initialized. As "git" binary is the only caller, the change is ok.
> If non-builtin commands want to use this function, they need to
> initialize startup_info first.

Hrm, that explanation is understandable, but it strongly makes me suspect
that this change is making the code _more_ error prone in the longer term.

When somebody wants to add a new caller to a non-builtin, they need to
think about what prefix to pass, and would realize that they need to call
setup_git_directory() to get it. With the updated code, they can totally
forget and call it without any initialized startup_info.

Adding a totally new command is rare, new non-builtin is rarer, and adding
trace to it is even more so, so it may not be worth worrying about, but I
wonder if there is a cheap way to check such a programming mistake.
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