Pipe opencode prompts via stdin instead of argv#1950
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TooTallNate merged 1 commit intomainfrom May 6, 2026
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Large backport prompts (commit message + diff capped at 200KB) can exceed Linux's `ARG_MAX` and cause `opencode run` to fail with "Argument list too long" (exit 126). Redirect the prompt files into `opencode run`'s stdin instead of passing them on the command line.
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Pull request overview
This PR updates the backport GitHub Actions workflow to avoid Linux ARG_MAX limits by feeding large opencode prompts via stdin instead of passing them as command-line arguments, preventing execve failures on large diffs/metadata.
Changes:
- Pipe
.backport-decision-prompt.txtintoopencode runvia stdin in the “Decide whether to backport” step. - Pipe
.backport-conflict-prompt.txtintoopencode runvia stdin in the “Resolve conflicts with opencode” step.
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No backport to This commit only modifies To override, add the |
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Summary
The backport workflow on the v4/v5 docs split commit (run 25418088947) failed with:
The large diff (capped at 200KB) plus the prompt prologue / commit metadata / PR body was big enough that the constructed argv blew past Linux's
ARG_MAX(~128KB), causingexecveto fail.Redirecting the prompt files into
opencode run's stdin instead of passing them on the command line avoids the limit. Verified locally thatopencode runreads the prompt from stdin when no positional message argument is given.