https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6083
Summary: sa-update should periodically validate MIRRORED.BY files
Product: Spamassassin
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P5
Component: sa-update
AssignedTo: [email protected]
ReportedBy: [email protected]
I was noticing that after the initial update installation, sa-update will not
try to update MIRRORED.BY files unless there is an update to download. This
means that channels w/ infrequent updates will have clients using potentially
outdated/changed MIRRORED.BY files. That then leads to a potential situation
where all the old mirrors are no longer function, and updates will fail.
ie:
1- sa-update run completes, gets MIRRORED.BY file from mirrors.[channel] DNS
pointer, stores it. entries are for serverX, serverY, and serverZ.
2- time goes on, no channel updates are published, but the previous servers are
replaced by serverA, serverB, and serverC and the MIRRORED.BY file is updated.
3- eventually an update is published and DNS updated.
4- client machines see they have a cached MIRRORED.BY file so try to download
updates from serverX, serverY, and serverZ, all which fail. at this point,
sa-update fails the channel as no mirrors are available.
So I would suggest that step 3.5 be inserted such that if the MIRRORED.BY
timestamp is old (say, >30d?,) an update attempt is made using the mirrors
(current method) w/ failback to mirrors.[channel] if necessary.
It would also be useful, probably, to try this if the channel download fails
due to all mirrors failing.
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