quico-os-setup/zfs-pacman-hook
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docs(script): pkg name regex is encapsulated in parentheses (#1)

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hygienic-books 2023-03-07 00:01:45 +01:00
parent 9a92e99c6a
commit 3277e7a31a
2 changed files with 2 additions and 2 deletions
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2
README.md
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@ -32,7 +32,7 @@ Get started like so:
In `pacman` on every `PreTransaction`, meaning right before any actual operation on a package begins, we trigger a ZFS snapshot. By default we identify the active system dataset by doing `findmnt / --noheadings --output source`. 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. In `pacman` on every `PreTransaction`, meaning right before any actual operation on a package begins, we trigger a ZFS snapshot. By default we identify the active system dataset by doing `findmnt / --noheadings --output source`. 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$` is considered important. Whenever an important package is affected by a transaction a snapshot goes into the corresponding chain. In all other cases - when an important package is not affected - snapshots go into the trivial chain. We retain two different snapshot chains, one for `pacman` transactions that only affect what we are calling _trivial_ packages and a separate chain for _important_ packages. By default only the exact regular expression package name match `^(linux)$` is considered important. 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 15 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. The _trivial_ snapshot chain by default keeps 15 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.

2
pacman-zfs-snapshot.sh
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@ -61,7 +61,7 @@ function split_pkgs_by_importance () {
local pkgs_in_transaction local pkgs_in_transaction
pkgs_in_transaction=("${@}") pkgs_in_transaction=("${@}")
for pkg in "${pkgs_in_transaction[@]}"; do for pkg in "${pkgs_in_transaction[@]}"; do
if grep -Piq -- '^'"${important_names}"'$' <<<"${pkg}"; then if grep -Piq -- '^('"${important_names}"')$' <<<"${pkg}"; then
important_pkgs_in_transaction+=("${pkg}") important_pkgs_in_transaction+=("${pkg}")
else else
trivial_pkgs_in_transaction+=("${pkg}") trivial_pkgs_in_transaction+=("${pkg}")