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doc: Describe how to update to a specific version.

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* doc/guix.texi (Invoking guix refresh): Describe how to update to a specific
version.
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Hartmut Goebel 2022-08-28 15:00:52 +02:00
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@ -13934,6 +13934,25 @@ gnu/packages/multiprecision.scm:40:12: 6.1.2 is already the latest version of gm
@end table
If for some reason you don't want to update to the latest version, you
can update to a specific version by appending an equal sign and the
desired version number to the package specification. Note that not all
updaters support this; an error is reported when an updater cannot
refresh to the specified version.
@example
$ guix refresh trytond-party
gnu/packages/guile.scm:392:2: guile would be upgraded from 3.0.3 to 3.0.5
$ guix refresh -u guile=3.0.4
@dots{}
gnu/packages/guile.scm:392:2: guile: updating from version 3.0.3 to version 3.0.4...
@dots{}
$ guix refresh -u guile@@2.0=2.0.12
@dots{}
gnu/packages/guile.scm:147:2: guile: updating from version 2.0.10 to version 2.0.12...
@dots{}
@end example
Sometimes the upstream name differs from the package name used in Guix,
and @command{guix refresh} needs a little help. Most updaters honor the
@code{upstream-name} property in package definitions, which can be used