Re: texlive-20190410-texmf.tar.xz again and again

[Tobias Geerinckx-Rice]

Simon,

zimoun 写道：
> I am often annoyed because when I run "guix upgrade", Guix
> downloads again the heavy texlive-20190410-texmf.tar.xz if I 
> have
> forgotten to protect it from "guix gc" using the trick, e.g.,
>
>   https://lists.gnu.org/archive/html/help-guix/2020-02/msg00110.html
>
> What could be a more general solution independent of the trick?

You might be happy with ‘--gc-keep-outputs’.

From (guix)Invoking guix-daemon:

‘--gc-keep-outputs[=yes|no]’
    Tell whether the garbage collector (GC) must keep outputs of 
    live
    derivations.

    When set to ‘yes’, the GC will keep the outputs of any live
    derivation available in the store—the ‘.drv’ files.  The 
    default is
    ‘no’, meaning that derivation outputs are kept only if they 
    are
    reachable from a GC root.  *Note Invoking guix gc::, for more 
    on GC
    roots.

‘--gc-keep-derivations[=yes|no]’
    Tell whether the garbage collector (GC) must keep derivations
    corresponding to live outputs.

    When set to ‘yes’, as is the case by default, the GC keeps
    derivations—i.e., ‘.drv’ files—as long as at least one of 
    their
    outputs is live.  This allows users to keep track of the 
    origins of
    items in their store.  Setting it to ‘no’ saves a bit of disk
    space.

    In this way, setting ‘--gc-keep-derivations’ to ‘yes’ causes
    liveness to flow from outputs to derivations, and setting
    ‘--gc-keep-outputs’ to ‘yes’ causes liveness to flow from
  ▶ derivations to outputs.  When both are set to ‘yes’, the 
  effect is
  ▶ to keep all the build prerequisites (the sources, compiler,
  ▶ libraries, and other build-time tools) of live objects in the
    store, regardless of whether these prerequisites are 
    reachable from
    a GC root.  This is convenient for developers since it saves
    rebuilds or downloads.

Kind regards,

T G-R

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