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docs(script): Expand on trivial and important packages distinction (#1)

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hygienic-books 2023-05-06 19:52:53 +02:00
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@ -44,6 +44,16 @@ zpool/root/archlinux
``` ```
If exactly one source returns that is the exact name of a ZFS dataset in an imported zpool we create a snapshot on it. If no source returns we silently exit. If more than one source returns we raise an error and halt the `pacman` transaction. If exactly one source returns that is the exact name of a ZFS dataset in an imported zpool we create a snapshot on it. If no source returns we silently exit. If more than one source returns we raise an error and halt the `pacman` transaction.
We retain two different snapshot chains, one for `pacman` transactions that only affect what we are calling _trivial_ packages and a separate chain for _important_ packages. By default only the exact regular expression package name match `^(linux|systemd|zfs-(dkms|utils))$` is considered important so in plain English any one of:
- `linux`
- `systemd`
- `zfs-dkms`
- `zfs-utils`
Whenever an important package is affected by a transaction a snapshot goes into the corresponding chain. In all other cases - when an important package is not affected - snapshots go into the trivial chain.
The _trivial_ snapshot chain by default keeps 25 snapshots, the _important_ chain keeps 5. The thought process here is that you will likely not futz around with a kernel every day whereas you may very well install arbitrary packages multiple times a day. Snapshots should keep you safe for a couple of days hence the defaults of 5 and 15 snapshots, respectively.
Snapshots may look like so: Snapshots may look like so:
``` ```