mixandClaude Opus 5.5
4678015bbd
At start, a saved offset whose fingerprint was not the current file's meant "start on the new file": what Postfix wrote between the panel's stop and the rotation was never read - delivery statuses, stored lines, refusals, inbound journal rows, the deferred counter. - tracker.resume marks the case (behind, prev); follow calls readRotated before the new file: it opens mail.log.1 (delaycompress leaves it plain), checks by fingerprint that it is the file the place belongs to, reads it from the saved offset to its end through handle (catching up: the once-protections apply) and flushes the stored lines. - Not found, not that file, or the offset past its end (rotated twice): logged, with the saved place's time - from when nothing was read. - The fingerprint gains the file's identity (device.inode, fileid_unix.go; empty elsewhere): two logs that begin alike are two files - the review-2026-08-followups row on collisions. A fingerprint saved before (hash alone) still matches by its hash (sameLog), so the first start after the upgrade resumes where it was. - store.LogtailState reads back updated_at. Tests: stop, append, rotate, append, start - both halves read, once each, the earlier line not again; a mail.log.1 that is another file is not read from the place; sameLog with an old and a new fingerprint. CHANGELOG [Unreleased], audit plan line ticked, roadmap 23/62. Evidence: GOOS=linux go vet ./internal/logtail clean; go test ./internal/logtail ok on Windows but for TestFollowTailsAndRotates; the server run follows before the push. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
25 lines
491 B
Go
25 lines
491 B
Go
//go:build unix
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package logtail
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import (
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"fmt"
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"os"
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"syscall"
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)
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// fileID names the file itself - device and inode - which a rename keeps and
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// a new file does not share. It is part of the log's fingerprint, so two log
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// files whose first bytes happen to match are still told apart.
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func fileID(f *os.File) string {
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info, err := f.Stat()
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if err != nil {
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return ""
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}
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st, ok := info.Sys().(*syscall.Stat_t)
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if !ok {
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return ""
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}
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return fmt.Sprintf("%d.%d", st.Dev, st.Ino)
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}
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