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guix package: Add '--switch-generation' option.

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* guix/scripts/package.scm (switch-to-generation): New procedure.
  (switch-to-previous-generation): Use it.
  (guix-package): Adjust for '--switch-generation' option.
* tests/guix-package.sh: Test it.
* doc/guix.texi (Invoking guix package): Document it.
This commit is contained in:
Alex Kost
2014-10-10 17:58:43 +04:00
parent 3ccde08752
commit b3bb82f154
3 changed files with 76 additions and 12 deletions
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15
doc/guix.texi
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@@ -806,6 +806,21 @@ Installing, removing, or upgrading packages from a generation that has
been rolled back to overwrites previous future generations. Thus, the
history of a profile's generations is always linear.
@item --switch-generation=@var{pattern}
@itemx -S @var{pattern}
Switch to a particular generation defined by @var{pattern}.
@var{pattern} may be either a generation number or a number prefixed
with ``+'' or ``-''. The latter means: move forward/backward by a
specified number of generations. For example, if you want to return to
the latest generation after @code{--roll-back}, use
@code{--switch-generation=+1}.
The difference between @code{--roll-back} and
@code{--switch-generation=-1} is that @code{--switch-generation} will
not make a zeroth generation, so if a specified generation does not
exist, the current generation will not be changed.
@item --search-paths
@cindex search paths
Report environment variable definitions, in Bash syntax, that may be