"W. Trevor King" <wk...@tremily.us> writes:

> From: "W. Trevor King" <wk...@tremily.us>
> Descriptions borrowed from templates/hooks--pre-rebase.sample.
> Signed-off-by: W. Trevor King <wk...@tremily.us>
> ---
> I'm not 100% convinced about this, because the git-rebase.sh uses:
>   "$GIT_DIR/hooks/pre-rebase" ${1+"$@"}
> I haven't been able to find documentation for the ${1+"$@"} syntax.
> Is it in POSIX?  It's not in the Bash manual:
>   $ man bash | grep '\${.*[+]'
>               (${BASH_SOURCE[$i+1]})  where  ${FUNCNAME[$i]}  was  called  (or
>               ${BASH_SOURCE[$i+1]}.
>               ${BASH_SOURCE[$i+1]}  at  line  number  ${BASH_LINENO[$i]}.  The
>        ${parameter:+word}
> In my local tests, it seems equivalent to "$@".
> Also, it appears that the `git-rebase--*.sh` handlers don't use the
> pre-rebase hook.  Is this intentional?

The codeflow of git-rebase front-end, when you start rebasing, will
call run_pre_rebase_hook before calling run_specific_rebase.  It
will be redundant for handlers to then call it again, no?

In "rebase --continue" and later steps, you would not want to see
the hook trigger.

>  Documentation/githooks.txt | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
> index b9003fe..bc837c6 100644
> --- a/Documentation/githooks.txt
> +++ b/Documentation/githooks.txt
> @@ -140,9 +140,10 @@ the outcome of 'git commit'.
>  pre-rebase
>  ~~~~~~~~~~
> -This hook is called by 'git rebase' and can be used to prevent a branch
> -from getting rebased.
> -
> +This hook is called by 'git rebase' and can be used to prevent a
> +branch from getting rebased.  The hook takes two parameters: the
> +upstream the series was forked from and the branch being rebased.  The
> +second parameter will be empty when rebasing the current branch.

Technically this is incorrect.

We call it with one or two parameters, and sometimes the second
parameter is _missing_, which is different from calling with an
empty string.  For a script written in some scripting languages like
shell and perl, the distinction may not matter (i.e. $2 and $ARGV[1]
will be an empty string when stringified) but not all (accessing
sys.argv[2] may give you an IndexError in Python).

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