Clean cache

src/startup.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -euo pipefail
+
+: "${ARCHIVE_PREFIX:?Set ARCHIVE_PREFIX to a non-empty archive prefix}"
+export BORG_HOST_ID=${BORG_HOST_ID:-$ARCHIVE_PREFIX}
+
+# Resolve Borg's cache settings before backups change directory.
+base_dir=${BORG_BASE_DIR-${HOME:-/root}}
+cache_home=${base_dir:+$base_dir/}.cache
+if [[ -z ${BORG_BASE_DIR:-} && -v XDG_CACHE_HOME ]]; then
+    cache_home=$XDG_CACHE_HOME
+fi
+cache_dir=${BORG_CACHE_DIR-${cache_home:+$cache_home/}borg}
+mkdir -p -- "$cache_dir"
+export BORG_CACHE_DIR
+BORG_CACHE_DIR=$(realpath -e -- "$cache_dir")
+
+# This cache belongs exclusively to this container. The previous container
+# must be stopped before startup; any remaining client-cache locks are orphaned.
+shopt -s nullglob
+for cache in "$BORG_CACHE_DIR"/*; do
+    [[ -d $cache && ! -L $cache && ${cache##*/} =~ ^[0-9a-f]{64}$ ]] || continue
+    grep -qx '\[cache\]' "$cache/config" || continue
+
+    if [[ -d $cache/lock.exclusive ]]; then
+        echo "Removing orphaned cache lock: $cache/lock.exclusive"
+        rm -r -- "$cache/lock.exclusive"
+    fi
+    
+    if [[ -e $cache/lock.roster ]]; then
+        rm -- "$cache/lock.roster"
+    fi
+done
+
+(( $# != 0 )) || set -- /src/schedule.sh
+exec "$@"