On 2008.03.31 01:14:08 +0200, Miklos Vajna wrote:
quoted text
> This patch modifies git gc --auto so that it will not always repack when
> a user is on battery.
> 
> It introduces the new gc.deferonbattery configuration variable, which
> defaults to true. If it's true and the user is on battery, it will not
> run git gc --auto.
> 
> Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
> ---
> 
> Idea is from e2fsprogs, such a repack may take a lot of time and usually
> you don't have infinite time when you are on battery.. :)
> 
> If the patch looks OK, just it's too late for 1.5.5, then please let me
> know and I'll resend after 1.5.5.
> 
> Thanks.
> 
>  Documentation/git-gc.txt |    4 +++
>  builtin-gc.c             |   49 ++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 53 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/git-gc.txt b/Documentation/git-gc.txt
> index d424a4e..7d54148 100644
> --- a/Documentation/git-gc.txt
> +++ b/Documentation/git-gc.txt
> @@ -104,6 +104,10 @@ The optional configuration variable 'gc.pruneExpire' controls how old
>  the unreferenced loose objects have to be before they are pruned.  The
>  default is "2 weeks ago".
>  
> +The optional configuration variable 'gc.deferonbattery' determines if
> +`git gc --auto` should be disabled if the system is running on battery.
> +This defaults to true.
> +
>  See Also
>  --------
>  linkgit:git-prune[1]
> diff --git a/builtin-gc.c b/builtin-gc.c
> index 8cef36f..7beb046 100644
> --- a/builtin-gc.c
> +++ b/builtin-gc.c
> @@ -23,6 +23,7 @@ static const char * const builtin_gc_usage[] = {
>  };
>  
>  static int pack_refs = 1;
> +static int defer_on_battery = 1;
>  static int aggressive_window = -1;
>  static int gc_auto_threshold = 6700;
>  static int gc_auto_pack_limit = 50;
> @@ -67,6 +68,10 @@ static int gc_config(const char *var, const char *value)
>  		prune_expire = xstrdup(value);
>  		return 0;
>  	}
> +	if (!strcmp(var, "gc.deferonbattery")) {
> +		defer_on_battery = git_config_bool(var, value);
> +		return 0;
> +	}
>  	return git_default_config(var, value);
>  }
>  
> @@ -157,6 +162,45 @@ static int too_many_packs(void)
>  	return gc_auto_pack_limit <= cnt;
>  }
>  
> +static int is_on_battery(void)
> +{
> +	FILE *fp;
> +	DIR *dir;
> +	char buf[256], state[256], path[256];
> +	unsigned int ac = 0;
> +	struct dirent* entry;
> +
> +	if (!defer_on_battery)
> +		return 0;

Hm, maybe move that check into need_to_gc instead? Seems a bit weird to
lie about the status instead of just skipping the status check.

quoted text
> +
> +	if ((fp = fopen("/proc/apm", "r"))) {
> +		if (fscanf(fp, "%s %s %s %x", buf, buf, buf, &ac) != 4)
> +			ac = 1;
> +		fclose(fp);
> +		return ac != 1;
> +	}
> +	if((dir = opendir("/proc/acpi/ac_adapter"))) {
> +		while ((entry = readdir(dir))) {
> +			if (!strcmp(".", entry->d_name) || !strcmp("..",
> +						entry->d_name))
> +				continue;
> +			snprintf(path, 255, "/proc/acpi/ac_adapter/%s/state",
> +					entry->d_name);
> +			if ((fp = fopen(path, "r"))) {
> +				if (fscanf(fp, "%s %s", buf, state) != 2)
> +					state[0] = '__PLACEHOLDER__1_';
> +				fclose(fp);
> +				if (!strncmp(state, "off-line", 8)) {
> +					closedir(dir);
> +					return 1;
> +				}
> +			}
> +		}
> +		closedir(dir);
> +	}
> +	return 0;
> +}

The /proc stuff is already deprecated IIRC, the new file to check on
Linux is /sys/class/power_supply/AC/online.

Björn

quoted text
> +
>  static int need_to_gc(void)
>  {
>  	/*
> @@ -176,6 +220,11 @@ static int need_to_gc(void)
>  		append_option(argv_repack, "-A", MAX_ADD);
>  	else if (!too_many_loose_objects())
>  		return 0;
> +
> +	if(is_on_battery()) {
> +		fprintf(stderr, "Auto packing deferred; on battery");
> +		return 0;
> +	}
>  	return 1;
>  }
>  
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