linux-kernel - Re: [PATCH 1/2] kconfig: add support for type handlers

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Date:	Sat, 26 Feb 2011 12:27:51 -0500
From:	Jeff Mahoney <jeffm@...e.com>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 1/2] kconfig: add support for type handlers

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On 02/25/2011 08:28 PM, Arnaud Lacombe wrote:
> Hi,
> 
> On Fri, Feb 25, 2011 at 7:44 PM, Jeff Mahoney <jeffm@...e.com> wrote:
>>  This patch adds type handlers for compressed config files. Initial
>>  support provides callouts for gzip and bzip2, but there's no reason
>>  others could be added if demand is there.
>>
>>  This is intended to allow /proc/config.gz be a configuration source
>>  for 'make oldconfig' when .config is absent.
>>
> this can be trivially scripted, any reason it _has_ to be done within kconfig ?

This is what the original patch I posted did, and I was asked to teach
kconfig how to do it itself.

- -Jeff


>> Signed-off-by: Jeff Mahoney <jeffm@...e.com>
>> ---
>>
>>  scripts/kconfig/zconf.l |   50 ++++++++++++++++++++++++++++++++++++++++++++++--
>>  1 file changed, 48 insertions(+), 2 deletions(-)
>>
>> --- a/scripts/kconfig/zconf.l
>> +++ b/scripts/kconfig/zconf.l
>> @@ -256,6 +256,44 @@ static void zconf_endhelp(void)
>>        BEGIN(INITIAL);
>>  }
>>
>> +static const struct type_handler {
>> +       const char *suffix;
>> +       const char *command;
>> +} type_handlers[] = {
>> +       {
>> +               .suffix = ".gz",
>> +               .command = "zcat",
>> +       },
>> +       {
>> +               .suffix = ".bz2",
>> +               .command = "bzcat",
>> +       },
>> +       /* Whatever other algorithms you like */
>> +       {}
>> +};
>> +
>> +static const struct type_handler *get_type_handler(const char *name)
>> +{
>> +       char *p = rindex(name, '.');
>> +       if (p) {
>> +               const struct type_handler *ops = type_handlers;
>> +               for (ops = type_handlers; ops->suffix; ops++) {
>> +                       if (!strcasecmp(ops->suffix, p))
>> +                               break;
>> +               }
>> +               if (!ops->suffix)
>> +                       return NULL;
>> +               return ops;
>> +       }
>> +       return NULL;
>> +}
>> +
>> +static FILE *zconf_popen(const char *command, const char *name)
>> +{
>> +       char cmdbuf[PATH_MAX + strlen(command) + 2];
>> +       snprintf(cmdbuf, sizeof(cmdbuf), "%s %s", command, name);
>> +       return popen(cmdbuf, "r");
>> +}
>>
>>  /*
>>  * Try to open specified file with following names:
>> @@ -267,15 +305,23 @@ static void zconf_endhelp(void)
>>  */
>>  FILE *zconf_fopen(const char *name)
>>  {
>> +       const struct type_handler *handler = get_type_handler(name);
>>        char *env, fullname[PATH_MAX+1];
>>        FILE *f;
>>
>> -       f = fopen(name, "r");
>> +       if (handler)
>> +               f = zconf_popen(handler->command, name);
>> +       else
>> +               f = fopen(name, "r");
>> +
>>        if (!f && name != NULL && name[0] != '/') {
>>                env = getenv(SRCTREE);
>>                if (env) {
>>                        sprintf(fullname, "%s/%s", env, name);
>> -                       f = fopen(fullname, "r");
>> +                       if (handler)
>> +                               f = zconf_popen(handler->command, fullname);
>> +                       else
>> +                               f = fopen(fullname, "r");
>>                }
>>        }
>>        return f;
>>
>> --
>> Jeff Mahoney
>> SUSE Labs
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>


- -- 
Jeff Mahoney
SUSE Labs
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