Fix parser for root (only) dataset names - investigate #619
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jimklimov
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jimklimov
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…a pool [oetiker#585] Signed-off-by: Jim Klimov <[email protected]>
…Set [oetiker#585] Signed-off-by: Jim Klimov <[email protected]>
…) and splitDataSetSnapshot() [oetiker#585] Signed-off-by: Jim Klimov <[email protected]>
…ent is actually a "dataset@snapname", return an undef snapname in the array if not [oetiker#585] Signed-off-by: Jim Klimov <[email protected]>
…etiker#585] Signed-off-by: Jim Klimov <[email protected]>
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oetiker
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Jan 9, 2024
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Follows up from #585 and a Gitter discussion https://matrix.to/#/!XZJhhFzueFpkcSXLHR:gitter.im/$gVcghYo80LIz2zIdyJQyfxRYJkyb07mQjoB5bGH5zTU?via=gitter.im&via=inf.ethz.ch&via=matrix.org (and later posts during the day)
The crux of it is that
znapzendv0.21.2 (current release) got confused when a backup schedule was defined on a root dataset of a pool AND the customtsformatincluded colons to separate hours-minutes-seconds:So a request to snapshot a local
bpooldataset asbpool@znapzend-auto-2024-01-08T10:22:13Zgot interpreted by the generic routine asuser=bpool,host=znapzend-auto-2024-01-08T10,dsname=22:13Zand an absent snap. The latter part also got further parsed for the subsequent command intohost=22anddsname=13Z, it seems.This visibly strikes in
sub createSnapshot {...},sub destroySnapshots {...}and probably other consumers ofsub $splitHostDataSet.If the "DST" definition remains (per help/man) as
[[user@]host:]datasetwheredatasetis fixed for DST but may bedsname[@snap]for general parsing (andsnapmay have some but not all sorts of funny characters) -- we don't really have good criteria (for regex or beside it) to tell apart auser@hostfrom partialdataset@snapstrings, in some cases, it seems.There are various ideas in that thread that can be pursued as separate PRs. This one lays the foundations for such pursuits, by adding a few run-time sanity checks (e.g. to avoid destructive actions with bogus values), and some self-test code to gauge success of different solution attempts. A large helper in this effort is the
t/znapzend-lib-splitter.tscript which calls whatever implementations we have inZFS.pmand runs them against a matrix of known remote, dataset and snapname strings (concatenated into what can be seen in production from configs and ZFS queries), to see if they get parsed back properly.