From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#35701: guix size should account for hard links in its disk space
	calculation
Date: Tue, 14 May 2019 10:17:59 +0200
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References: <878svbv5v7.fsf@gmail.com>
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In-Reply-To: <878svbv5v7.fsf@gmail.com> (Maxim Cournoyer's message of "Sun, 12
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To: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Cc: 35701@debbugs.gnu.org

Salut Maxim,

Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:

> Conclusion: the size of grafts is added multiple times even though they
> should be very light on disk usage given that they are mostly hard links
> to the original, ungrafted output.

I think there should be an option to take hard links into account, but
it should probably not be done by default.  There are cases (e.g., when
using =E2=80=98guix pack=E2=80=99 or when evaluating the amount of data tha=
t will
actually be transferred over the wire) where you want to know the
=E2=80=9Capparent size=E2=80=9D, ignoring hard links.

Note that it=E2=80=99s a bit more work to take hard links into account since
currently =E2=80=98guix size=E2=80=99 just queries each store item=E2=80=99=
s size to the
daemon.

Thanks,
Ludo=E2=80=99.