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Re: pre-release [PATCH] git-service

From: Ricardo Wurmus
Subject: Re: pre-release [PATCH] git-service
Date: Fri, 08 Jul 2016 22:41:30 +0200
User-agent: mu4e 0.9.16; emacs 24.5.1

Thompson, David <address@hidden> writes:

> On Fri, Jul 8, 2016 at 11:53 AM, ng0 <address@hidden> wrote:
>> I need some feedback on the git-service.
>> The inserted patch gives me this output:
>> +(define-record-type* <git-configuration>
>> +  git-configuration make-git-configuration
>> +  git-configuration?
>> +  (git       git-configuration-git ; <package>
>> +             (default git))
>> +  (base-path git-configuration-base-path) ; string
>> +  (port      git-configuration-port)) ; string
> So, this is a record type...
>> +
>> +(define git-shepherd-service
>> +  (match-lambda
>> +    (($ <git-configuration> git base-path port)
>> +     (let ((conf (string-append
>> +                  "--base-path="base-path
>> +                  "--port="(number->string port))))
>> +       (list (shepherd-service
>> +              (provision '(git))
>> +              (requirement '(networking loopback syslogd))
>> +              (documentation "Run the git-daemon server for git 
>> repositories")
>> +              (start #~(make-forkexec-constructor
>> +                        (list (string-append #$git "/bin/git")
>> +                              "daemon" "--syslog" "--informative-errors"
>> +                              #$conf)))
> ...and you (ungexp conf), where conf is an instance of that record
> type, into what is supposed to be a list of strings that form command
> line arguments for git.  See the issue?

I might be misreading this, but “conf” here is literally the string


when “base-path” is the string “something” and “port” is the number

The let binding for “conf” is incorrect.

First, you say earlier that “port” is a string:

> +  (port      git-configuration-port)) ; string

but then you pass it to “number->string”, so it’s actually expected to
be a number.

Second, the argument to “make-forkexec-constructor” is supposed to be a
list of strings, each representing one argument.  So defining “conf” as
a concatenation is not okay.  You don’t need a let-binding for “conf” at
all.  Just use “base-path” and “port” directly.  (I haven’t tested

    (list (string-append #$git "/bin/git")
          "daemon" "--syslog" "--informative-errors"
          (string-append "--base-path=" $#base-path)
          (string-append "--port=" $#port))

But the error you get stems from passing a value of
“<git-configuration>” to something that expects a package.  I don’t see
where this happens.  Since I cannot see “~/testvm.scm” I cannot tell you
anything more.

~~ Ricardo

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