guix system: If the new system generation already exists, overwrite it.
Fixes <http://bugs.gnu.org/25100>. Before that, 'guix system reconfigure' would fail if the next generation already existed. * guix/scripts/system.scm (switch-to-system): Use 'switch-symlink' instead of 'symlink'. * doc/guix.texi (Using the Configuration System, Invoking guix system): Document the behavior. Signed-off-by: Ludovic Courtès <ludo@gnu.org>master
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@ -7174,7 +7174,15 @@ modifying or deleting previous generations. Old system generations get
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an entry in the GRUB boot menu, allowing you to boot them in case
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something went wrong with the latest generation. Reassuring, no? The
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@command{guix system list-generations} command lists the system
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generations available on disk.
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generations available on disk. It is also possible to roll back the
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system via the commands @command{guix system roll-back} and
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@command{guix system switch-generation}.
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Although the command @command{guix system reconfigure} will not modify
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previous generations, must take care when the current generation is not
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the latest (e.g., after invoking @command{guix system roll-back}), since
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the operation might overwrite a later generation (@pxref{Invoking guix
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system}).
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@unnumberedsubsubsec The Programming Interface
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@ -12599,6 +12607,12 @@ currently running; if a service is currently running, it does not
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attempt to upgrade it since this would not be possible without stopping it
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first.
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This command creates a new generation whose number is one greater than
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the current generation (as reported by @command{guix system
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list-generations}). If that generation already exists, it will be
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overwritten. This behavior mirrors that of @command{guix package}
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(@pxref{Invoking guix package}).
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It also adds a GRUB menu entry for the new OS configuration, and moves
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entries for older configurations to a submenu---unless
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@option{--no-grub} is passed.
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@ -326,7 +326,7 @@ it atomically, and then run OS's activation script."
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(let* ((system (derivation->output-path drv))
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(number (+ 1 (generation-number profile)))
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(generation (generation-file-name profile number)))
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(symlink system generation)
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(switch-symlinks generation system)
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(switch-symlinks profile generation)
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(format #t (_ "activating system...~%"))
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