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Simplifies rollbacks: revert symlink to previous directory.
Also,
* make directory names more intuitive: use $(date) for the _new_
directory, instead of the old one;
* write update patches to the new directory, instead of the old one;
* tee update summary to the new directory, so that it survives the
transient shell the update was run from.
Also, ask the augurs why 'test' has both -h and -L for symbolic links,
https://pubs.opengroup.org/onlinepubs/9799919799/utilities/test.html
and get no answer 🤷
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Be cautiously optimistic: hope that the update process will work; stop
"generate dummy config & install everything from scratch" shenanigans.
(Do create a backup folder tho, just in case)
Also, compute patches for perusal.
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No idea how I managed to commit it in such a non-working state.
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I update somewhat infrequently, and more often than not some packages
will fail to compile for obscure reasons.
At this stage, I've done the "generate minimal .emacs with selected
packages, install from scratch" dance that I figure I might as well
automate it.
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