Re: [PATCH v2] ssh signing: return an error when signature cannot be read

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On 04.10.2022 10:01, Phillip Wood via GitGitGadget wrote:
From: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>

If the signature file cannot be read we print an error message but do
not return an error to the caller. In practice it seems unlikely that
the file would be unreadable if the call to ssh-keygen succeeds.

The unlink_or_warn() call is moved to the end of the function so that
we always try and remove the signature file. This isn't strictly
necessary at the moment but it protects us against any extra code
being added between trying to read the signature file and the cleanup
at the end of the function in the future. unlink_or_warn() only prints
a warning if it exists and cannot be removed.

Sounds sensible and the change looks good to me.


Signed-off-by: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
---
   ssh signing: return an error when signature cannot be read

   Thanks to Junio for his comments. I've updated the patch to always use
   unlink_or_warn() to remove the signature file as it does not warn on
   missing files.

   V1 cover letter

   This patch is based on maint. In the longer term the code could be
   simplified by using pipes rather than tempfiles as we do for gpg.
   ssh-keygen has supported reading the data to be signed from stdin and
   writing the signature to stdout since it introduced signing.

The ssh-keygen call is already using stdin for the content to sign or verify. The signature and the signing key need to be files passed as parameters to ssh-keygen. I'm not aware of any other option of providing them to it.

Cheers,
Fabian




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