José Almeida
35 lines
948 B
Bash
35 lines
948 B
Bash
#!/usr/bin/env bash
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# Resolve one npm package/version spec. A missing package, version, or dist-tag
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# is a successful empty result; registry and network failures are errors.
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set -euo pipefail
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if [[ "$#" -ne 1 || -z "$1" ]]; then
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echo "Usage: $0 <package-spec>" >&2
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exit 2
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fi
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SPEC="$1"
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ERROR_FILE="$(mktemp)"
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trap 'rm -f "$ERROR_FILE"' EXIT
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MAX_ATTEMPTS=3
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RETRY_DELAY_SECONDS=2
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for ((attempt = 1; attempt <= MAX_ATTEMPTS; attempt++)); do
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if VERSION="$(npm view "$SPEC" version --loglevel=error 2>"$ERROR_FILE")"; then
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printf '%s\n' "$VERSION"
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exit 0
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fi
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if grep -qiE '^npm (error|ERR!) (code E404|404([[:space:]]|$)|No match found for version|[^[:space:]]+ is not in this registry)' "$ERROR_FILE"; then
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exit 0
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fi
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if ((attempt < MAX_ATTEMPTS)); then
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echo "npm view attempt $attempt/$MAX_ATTEMPTS failed for $SPEC; retrying" >&2
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sleep "$RETRY_DELAY_SECONDS"
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fi
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done
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echo "npm view failed for $SPEC" >&2
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exit 1
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