Jeff King venit, vidit, dixit 14.06.2016 11:41:
> On Tue, Jun 14, 2016 at 04:39:38PM +0800, ZhenTian wrote:
> 
>> I want to set gpg -v to pgp.program, but if I set it, it can't call gpg:
>> ```
>> error: cannot run gpg -v: No such file or directory
>> error: could not run gpg.
>> fatal: failed to write commit object
>> ```
>>
>> I have tried set gpg.program value to `gpg|/tmp/log`, `/usr/bin/gpg
>> -v`, `gpg -v`, `"/usr/bin/gpg -v"`
>>
>> only after I set to `gpg` or `/usr/bin/gpg` without any argument, it will 
>> work.
> 
> Ah, right. Most of the time we run such programs as shell commands, but
> it looks like we do not. So you'd have to do something like:
> 
>       cat >/tmp/fake-gpg <<-\EOF
>       #!/bin/sh
>       gpg -v "$@"
>       EOF
>       chmod +x /tmp/fake-gpg
>       git config gpg.program /tmp/fake-gpg
> 
> -Peff
> 

The content of "gpg.program" is used as argv[0] when we build up various
commands to be run; we expect it to heed standard gpg options.

On the other hand:

git -c gpg.program=echo commit -S

'successfully' creates a commit that has

gpgsig -bsau Michael J Gruber <mic...@mouse.dis>

as the last header line. gpg.program=true fails (as does cat, unhappy
with the options), so apparently we do some error checking but not enough.

Michael
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