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Add tail to print and follow a fleet's logs - #36
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tail takes a fleet id and optional IMEIs. Without -n it follows new logs. -n prints the newest logs, and --offset skips that many of the newest first so a tool can page back.
Plain tail prints the newest 100 logs before following, and retries from the same cursor while the server is unavailable. -o replaces --offset and sends offset with last, so a window never pages. Later lines of a log are indented under the first.
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tail <fleet_id> [imei ...] [-n num [-o num]]reads a fleet's logs fromGET /fleets/{id}/logs.-n, it prints the newest 100 logs, then follows the fleet until Ctrl-C. A request that fails because the network or the server is unavailable is retried from the same cursor after one second.-nprints a window of past logs and exits. It is 1 to 1,000 and is one request withlast, so it never waits and never pages.-osits the window back by that many of the newest logs, 1 or more, and needs-n. It sendsoffsetwithlast.Each log prints as
<local time with offset> <IMEI> <kind> [<name>] <text>. Later lines of a text are indented by the width of the fields, so the text forms one column. Tabs, newlines and printable characters print as they are, and every other character is escaped.CGO_ENABLED=0go build,go vet,gofmt -l,go mod tidyandgo test ./...pass. Tests cover the argument refusals, windows with and without-oincluding the largest window over 2,500 stored logs, the printed layout of a multi-line log, and a follow that prints the newest 100, retries a 503 from the same cursor, and ends on the server's refusal. The binary atc161b08ran against the server route in superstack-servered8e54d. The binary ata891f96has not run against a server.