Unordered ’%actions’ process from ’guix package’
(address . bug-guix@gnu.org)
864kav2q73.fsf@gmail.com
Hi,
Let consider:
$ guix package -S 17 -d 18
but
$ guix package -d 18 -S 17
does not the same thing. The '%actions' (roll-back, delete-generation,
switch-generation) are processed in reversed order as they appear on the
command-line -- because 'for-each' and 'assoc-ref'.
However, the transaction plan is always the same:
step0 process %actions
step1 remove
step2 install
step3 manifest
Therefore, I propose to split the 'for-each' on '%actions' (step0) into
fixed steps, such as the transaction always happens using this plan:
1. roll-back
2. switch-generation
3. delete-generation
4. remove
5. install
6. manifest
whatever the order in the command line.
On one hand, it reduces the "power" of combining '-S', '-d' and
'--roll-back'. On the other hand, it enforces commutativity which is
somehow what we want a transaction to be.
WDYT? I can come up with a patch. This initial issue had been reported
by bug#40549 [1].
(Note that an issue about short-name with optional argument can also
happen and tracked by bug#50472 [2].)
All the best,
simon