feat(docker-stack): add archmirror stack

docker/stacks/archmirror/rsync/Dockerfile

@@ -0,0 +1,24 @@
+FROM alpine:latest AS builder
+
+RUN apk add --no-cache curl \
+    && curl -fsSLO https://github.com/aptible/supercronic/releases/download/v0.2.29/supercronic-linux-amd64 \
+    && echo "cd48d45c4b10f3f0bfdd3a57d054cd05ac96812b  supercronic-linux-amd64" | sha1sum -c - \
+    && chmod +x supercronic-linux-amd64
+
+FROM alpine:latest
+
+RUN apk add --no-cache rsync flock \
+    && rm -rf /var/cache/apk/*
+
+COPY --from=builder /supercronic-linux-amd64 /usr/local/bin/supercronic
+
+RUN mkdir -p /archlinux /var/log /var/lock
+
+COPY sync.sh /usr/local/bin/sync.sh
+COPY crontab /etc/crontab
+
+RUN chmod +x /usr/local/bin/sync.sh
+
+WORKDIR /archlinux
+
+CMD ["supercronic", "/etc/crontab"]

docker/stacks/archmirror/rsync/crontab

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+0 */6 * * * /usr/bin/flock -n /var/lock/archlinux-sync.lock /usr/local/bin/sync.sh
+* * * * * [ ! -f /var/lock/initial-sync-done ] && /usr/bin/flock -n /var/lock/archlinux-sync.lock /usr/local/bin/sync.sh && touch /var/lock/initial-sync-done

docker/stacks/archmirror/rsync/sync.sh

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+#!/bin/sh
+set -e
+
+TARGET_DIR="/archlinux"
+MAX_RETRIES=3
+
+log() {
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >&2
+}
+
+if [ -z "$MIRROR_URL" ]; then
+    log "ERROR: MIRROR_URL not set"
+    exit 1
+fi
+
+mkdir -p "$TARGET_DIR"
+for i in $(seq 1 $MAX_RETRIES); do
+    log "Sync attempt $i/$MAX_RETRIES from $MIRROR_URL"
+    
+    if rsync --timeout=7200 \
+             -rlptH --safe-links --delete-delay --delay-updates \
+             ${RSYNC_EXTRA_OPTIONS:-} \
+             "$MIRROR_URL/" "$TARGET_DIR/"; then
+        log "Sync completed successfully"
+        exit 0
+    fi
+    
+    [ $i -lt $MAX_RETRIES ] && sleep $((i * 300))
+done
+
+log "All sync attempts failed"
+exit 1