eSliderandCursor
2d674de546
Root usage documents commands; help/-h/--help and unknown-command paths print the same text. test_hang.sh reproduces blocking reads on stdin. Co-authored-by: Cursor <cursoragent@cursor.com>
70 lines
2.2 KiB
Bash
Executable File
70 lines
2.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Reproduce and explain envc "hangs": default input is stdin (-); io.ReadAll
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# blocks until EOF. A TTY waits for Ctrl-D; /dev/zero never EOF (infinite read).
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set -euo pipefail
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ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
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cd "$ROOT"
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ENVC="${TMPDIR:-/tmp}/envc-hang-test.$$"
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cleanup() { rm -f "$ENVC"; }
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trap cleanup EXIT
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echo "== build envc -> $ENVC"
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go build -o "$ENVC" ./cmd/envc
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echo
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echo "== 1) expected to finish quickly (YAML on stdin, explicit -)"
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printf 'k: 1\n' | "$ENVC" convert --from yaml --to json --input - --output - | head -c 200
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echo
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echo " (ok)"
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echo
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echo "== 2) empty stdin should finish quickly (EOF immediately)"
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if ! out="$( "$ENVC" convert --from yaml --to json --input - --output - </dev/null 2>&1 )"; then
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echo " exit non-zero (often empty YAML parse); stderr/out:"
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echo "$out" | sed 's/^/ | /'
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echo " (ok — no hang, process terminated)"
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else
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echo "$out" | sed 's/^/ /'
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echo " (ok — no hang)"
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fi
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echo
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echo "== 3) infinite stdin: should hit wall-clock limit (GNU timeout -> 124)"
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if ! command -v timeout >/dev/null; then
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echo " skip: no 'timeout' in PATH"
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else
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set +e
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timeout -v 2s "$ENVC" convert --from yaml --to json --input - --output - </dev/zero >/dev/null 2>&1
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ec=$?
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set -e
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if [[ "$ec" -eq 124 ]]; then
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echo " timeout fired (exit 124) — binary was blocked in read (no EOF on stdin)."
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elif [[ "$ec" -eq 137 ]] || [[ "$ec" -eq 143 ]]; then
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echo " killed by signal (exit $ec) — still indicates blocked read until SIGKILL/SIGTERM."
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else
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echo " unexpected exit $ec (expected 124 from GNU timeout on hang)"
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exit 1
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fi
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fi
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echo
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echo "== why it happens"
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cat <<'EOF'
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convert/get default to reading the input source once with io.ReadAll.
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For --input - (convert) or positional "-" (get), that is os.Stdin until EOF.
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- Interactive shell, no pipe: stdin is a TTY — blocked until you press Ctrl-D
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or pipe data in.
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- /dev/zero (or any endless reader): never EOF — blocked until killed or OOM.
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merge uses the same pattern for non-"-" inputs via bytesutil; URL fetches use
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a 30s HTTP client timeout (see internal/source.URL).
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Fix for users: pass a file or URL (--input path), or pipe finite data into stdin.
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EOF
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echo
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echo "== done"
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