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71 lines
2.5 KiB
Bash
71 lines
2.5 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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# Check for required arguments.
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if [ "$#" -lt 3 ]; then
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echo "Usage: $0 <output directory> <architecture> <version1> [<version2> ...]"
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exit 1
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fi
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OUTPUT_DIR=$1
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ARCHITECTURE=$2
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shift 2
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VERSIONS=("$@")
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URLS=$(lynx -dump -listonly -nonumbers https://mirrors.wikimedia.org/debian/pool/main/l/linux/)
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readonly URLS
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# Find the latest revision of each kernel version.
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FILES=()
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for VERSION in "${VERSIONS[@]}"; do
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REGEX="linux-image-${VERSION//./\\.}\\.[0-9]+(-[0-9]+)?(\+bpo|\+deb[0-9]+)?-cloud-${ARCHITECTURE}-unsigned_.*\\.deb"
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match=$(printf '%s\n' "$URLS" | grep -E "$REGEX" | sort -V | tail -n1) || {
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printf '%s\nVERSION=%s\nREGEX=%s\n' "$URLS" "$VERSION" "$REGEX" >&2
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exit 1
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}
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FILES+=("$match")
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# The debug package contains the actual System.map. Debian has transitioned
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# between -dbg and -dbgsym suffixes, so match either for the specific kernel
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# we just selected.
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kernel_basename=$(basename "$match")
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kernel_prefix=${kernel_basename%%_*}
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kernel_suffix=${kernel_basename#${kernel_prefix}_}
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base_prefix=${kernel_prefix%-unsigned}
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base_prefix_regex=$(printf '%s\n' "$base_prefix" | sed 's/[][(){}.^$*+?|\\-]/\\&/g')
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kernel_suffix_regex=$(printf '%s\n' "$kernel_suffix" | sed 's/[][(){}.^$*+?|\\-]/\\&/g')
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DEBUG_REGEX="${base_prefix_regex}-dbg(sym)?_${kernel_suffix_regex}"
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debug_match=$(printf '%s\n' "$URLS" | grep -E "$DEBUG_REGEX" | sort -V | tail -n1) || {
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printf 'Failed to locate debug package matching %s\n%s\nVERSION=%s\nREGEX=%s\n' \
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"$kernel_basename" "$URLS" "$VERSION" "$DEBUG_REGEX" >&2
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exit 1
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}
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FILES+=("$debug_match")
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done
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# Note: `--etag-{compare,save}` are not idempotent until curl 8.9.0 which included
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# https://github.com/curl/curl/commit/85efbb92b8e6679705e122cee45ce76c56414a3e. At the time of
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# writing our CI uses Ubuntu 22.04 which has curl 7.81.0 and the latest available is Ubuntu 24.04
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# which has curl 8.5.0. Since neither has a new enough curl, we don't bother to update, but we
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# should do so when Ubuntu 24.10 or later is available.
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mkdir -p "$OUTPUT_DIR"
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KEEP=()
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for FILE in "${FILES[@]}"; do
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name=$(basename "$FILE")
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etag_name="$name.etag"
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KEEP+=("$name" "$etag_name")
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etag="$OUTPUT_DIR/$etag_name"
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curl -sfSL --output-dir "$OUTPUT_DIR" --remote-name-all --etag-compare "$etag" --etag-save "$etag" "$FILE"
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done
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# Remove any files that were previously downloaded that are no longer needed.
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FIND_ARGS=()
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for FILE in "${KEEP[@]}"; do
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FIND_ARGS+=("!" "-name" "$FILE")
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done
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find "$OUTPUT_DIR" -type f "${FIND_ARGS[@]}" -exec rm {} +
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