Re: [REGRESSION] uninitialized value $address in git send-email

[Michael Strawbridge <michael.strawbridge@amd.com>]

Hi,

Author of a8022c5f7b67 (send-email: expose header information to
git-send-email's sendemail-validate hook, 2023-04-19) here.

On 2023-09-18 08:56, Bagas Sanjaya wrote:
> Hi,
>
> Recently when I was submitting doc fixes to linux-doc mailing list [1]
> using git-send-email(1), I got perl-related error:
>
> ```
> Use of uninitialized value $address in sprintf at /home/bagas/.app/git/dist/v2.42.0/libexec/git-core/git-send-email line 1172.
> error: unable to extract a valid address from:
> ```
>
> My linux.git clone has sendemail-validate hook which uses patatt (from b4
> package). The hook is:
>
> ```
> #!/bin/sh
> # installed by patatt install-hook
> patatt sign --hook "${1}"
> ```
>
> This issue occurs on Git v2.41.0 but not in v2.40.0. Bisecting, the culprit is
> commit a8022c5f7b67 (send-email: expose header information to git-send-email's
> sendemail-validate hook, 2023-04-19). Emily's earlier report [2] also points to
> the same culprit, but with different bug.
>
> I triggered this issue on patch series with cover letter. To reproduce:
>
> 1. Clone git.git repo, then branch off:
>
>    ```
>    $ git clone https://github.com/git/git.git && cd git
>    $ git checkout -b test
>    ```
>
> 2. Make two dummy signed-off commits:
>
>    ```
>    $ echo test > test && git add test && git commit -s -m "test"
>    $ echo "test test" >> test && git commit -a -s -m "test test"
>    ```
>
> 3. Generate patch series:
>
>    ```
>    $ mkdir /tmp/test
>    $ git format-patch -o /tmp/test --cover-letter main
>    ```
>
> 4. Send the series to dummy address:
>
>    ```
>    $ git send-email --to="pi <pi@pi>" /tmp/test/*.patch
>    ```

I tried to repro this today on my side.  I can repro the error when
using the address "pi <pi@pi>" but that's not a valid email address and
so one would expect it to fail in the extract_valid_address_or_die
function with the error that you mention.  As soon as I make the address
valid like "pi <pi@pi.com>", git send-email no longer complains.

In your original case, are you trying to send email to an invalid email
address?  Is it an alias by chance?

Thanks.

> git-send-email(1) trips on the cover letter since there is no recipient
> addresses detected. It also errored out on patches without Signed-off-by
> trailer. When the command should have been succeeded, I expected that it
> asked me whether to send each patch or not.
>
> My system runs Debian testing (trixie/sid) with perl 5.36.0.
>
> Thanks.
>
> [1]: https://lore.kernel.org/linux-doc/20230918093240.29824-1-bagasdotme@gmail.com/
> [2]: https://lore.kernel.org/git/CAJoAoZ=GGgjGOeaeo6RFBO7=6msdRf-Ze6XcnL04K5ugupLUJA@mail.gmail.com/
>