initial commit

scripts/backup/pg-dump.sh

@@ -0,0 +1,69 @@
+#!/bin/sh
+set -eu
+
+# Minimal PATH for cron-like environments
+PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
+
+log() {
+    printf '%s %s\n' "$(date -u +%Y-%m-%dT%H:%M:%SZ)" "$*"
+}
+
+err() {
+    log "ERROR: $*" >&2
+}
+
+log "pg-dump.sh starting"
+
+# Validate required env vars
+: "${POSTGRES_USER:?POSTGRES_USER not set}"
+: "${POSTGRES_HOST:?POSTGRES_HOST not set}"
+
+date_formatted() {
+    local format="${1:-%F_%H-%M}"
+    # Use TIMEZONE env var if present; fall back to UTC
+    if [ -n "${TIMEZONE:-}" ]; then
+        TZ="$TIMEZONE" date +"$format"
+    else
+        date +"$format"
+    fi
+}
+
+BACKUP_DIR=/backups/databases
+mkdir -p "$BACKUP_DIR"
+log "Using backup dir: $BACKUP_DIR"
+
+STATUS_FILE="$BACKUP_DIR/.last_backup_complete"
+
+# Function to dump a specific database
+dump_database() {
+    local db=$1
+    log "Checking existence of $db database..."
+    local db_exists
+    db_exists=$(psql -U "$POSTGRES_USER" -h "$POSTGRES_HOST" -tAc "SELECT 1 FROM pg_database WHERE datname='$db'")
+    if [[ "$db_exists" != "1" ]]; then
+        err "Database '$db' does not exist. Skipping dump."
+        return 2
+    fi
+
+    log "Dumping $db database..."
+    local outfile="$BACKUP_DIR/${db}_$(date_formatted).sql.gz"
+    if pg_dump -U "$POSTGRES_USER" -h "$POSTGRES_HOST" "$db" | gzip > "$outfile"; then
+        log "$db database dumped and compressed: $outfile"
+        return 0
+    else
+        err "Failed to dump $db database"
+        return 1
+    fi
+}
+
+# Dump each database
+for db in $DB_LIST; do
+    dump_database "$db" || exit 1
+done
+
+tmp_status=$(mktemp "$BACKUP_DIR/.last_backup_complete.XXXXXX")
+date -u +%s > "$tmp_status"
+mv "$tmp_status" "$STATUS_FILE"
+log "Recorded database backup completion marker at $STATUS_FILE"
+
+log "pg-dump.sh finished successfully"