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205af7cd01
## Problem Several runner code paths could drop the **tail** of a step's log output, so a failing (or cancelled) step would show output that is missing its last line(s). This was observed in practice and traced to four independent issues. ## Root causes & fixes ### 1. Trailing line without a newline was never flushed `common.lineWriter` buffers output until it sees a `\n`. A final line **without** a trailing newline (e.g. an error message printed right before a process exits, a panic, `printf` without `\n`) stayed in the internal buffer and was never emitted — the writer exposed no flush at all. - Added `lineWriter.Flush()` (idempotent), a `Flusher` interface, and a `FlushWriter(io.Writer)` helper. - Flush at every stream EOF: the exec copy goroutine, the container `attach()` streaming goroutine, and at step end (`useStepLogger`). ### 2. Cancellation/timeout truncated output `waitForCommand` returned immediately on `ctx.Done()` and abandoned the output-copy goroutine, losing output the command had already produced. It now drains with a bounded grace period before returning. The response channel is buffered so the goroutine can't leak if the drain times out. ### 3. `attach()` raced the final bytes Container output was streamed in a fire-and-forget goroutine that `wait()` did not synchronize with, so the step could proceed before the last bytes were written. `wait()` now blocks on the streaming goroutine (bounded) so output is fully drained and flushed first. ### 4. `::stop-commands::` silently dropped lines from the step log Lines between `::stop-commands::<token>` and its end token were echoed without the `raw_output` field **and** short-circuited the handler chain (`return false`), so they never reached the step log (non-raw entries aren't appended while a step is running). Now returns `true` so they are still captured. Reviewed-on: https://gitea.com/gitea/runner/pulls/1028 Reviewed-by: Zettat123 <39446+zettat123@noreply.gitea.com>