stack/hw/test/backup.bats

#!/usr/bin/env bats
# Tests for nightly backup script logic

load test_helper

setup() {
    setup_test_work

    # Create the backup script for testing
    cat > "${TEST_WORK}/backup-nightly" << 'BACKUP'
#!/bin/sh
set -e
LOGFILE="${TEST_WORK}/backup.log"
BACKUP_DIR="${TEST_WORK}/backup"
DATE=$(date +%Y-%m-%d)
RETAIN_DAYS=7

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >> "$LOGFILE"; }

# Simulate mount checks
check_volumes() {
    [ -d "$BACKUP_DIR" ] && [ -f "${BACKUP_DIR}/.mounted" ]
}

do_backup() {
    local SNAP_DIR="${BACKUP_DIR}/snapshots/${DATE}"
    local LATEST_LINK="${BACKUP_DIR}/latest"
    mkdir -p "$SNAP_DIR/rustfs" "$SNAP_DIR/docker-volumes" "$SNAP_DIR/config"
    # Simulate data
    echo "test-data-${DATE}" > "$SNAP_DIR/rustfs/test.dat"
    echo "config-data" > "$SNAP_DIR/config/fstab"
    # Update latest
    rm -f "$LATEST_LINK"
    ln -s "$SNAP_DIR" "$LATEST_LINK"
    log "DONE: backup complete"
}

rotate() {
    find "${BACKUP_DIR}/snapshots" -maxdepth 1 -type d -mtime +${RETAIN_DAYS} -exec rm -rf {} \; 2>/dev/null || true
}
BACKUP
    chmod +x "${TEST_WORK}/backup-nightly"
    # Source it for function access
    . "${TEST_WORK}/backup-nightly"

    mkdir -p "${TEST_WORK}/backup"
    touch "${TEST_WORK}/backup/.mounted"
}

teardown() {
    teardown_test_work
}

# ─── Backup directory structure ───

@test "backup creates dated snapshot directory" {
    do_backup
    local today
    today=$(date +%Y-%m-%d)
    assert [ -d "${TEST_WORK}/backup/snapshots/${today}" ]
}

@test "backup creates rustfs subdirectory" {
    do_backup
    local today
    today=$(date +%Y-%m-%d)
    assert [ -d "${TEST_WORK}/backup/snapshots/${today}/rustfs" ]
}

@test "backup creates docker-volumes subdirectory" {
    do_backup
    local today
    today=$(date +%Y-%m-%d)
    assert [ -d "${TEST_WORK}/backup/snapshots/${today}/docker-volumes" ]
}

@test "backup creates config subdirectory" {
    do_backup
    local today
    today=$(date +%Y-%m-%d)
    assert [ -d "${TEST_WORK}/backup/snapshots/${today}/config" ]
}

@test "backup writes data to snapshot" {
    do_backup
    local today
    today=$(date +%Y-%m-%d)
    assert [ -f "${TEST_WORK}/backup/snapshots/${today}/rustfs/test.dat" ]
}

# ─── Latest symlink ───

@test "backup updates latest symlink" {
    do_backup
    assert [ -L "${TEST_WORK}/backup/latest" ]
}

@test "latest symlink points to today's snapshot" {
    do_backup
    local today
    today=$(date +%Y-%m-%d)
    local target
    target=$(readlink "${TEST_WORK}/backup/latest")
    assert_equal "$target" "${TEST_WORK}/backup/snapshots/${today}"
}

@test "latest symlink is updated on second backup" {
    # Simulate two days
    BACKUP_DIR="${TEST_WORK}/backup"
    mkdir -p "${BACKUP_DIR}/snapshots/2026-03-27/rustfs"
    ln -sf "${BACKUP_DIR}/snapshots/2026-03-27" "${BACKUP_DIR}/latest"

    do_backup
    local target
    target=$(readlink "${TEST_WORK}/backup/latest")
    local today
    today=$(date +%Y-%m-%d)
    assert_equal "$target" "${TEST_WORK}/backup/snapshots/${today}"
}

# ─── Volume check ───

@test "backup skips when volumes not mounted" {
    rm -f "${TEST_WORK}/backup/.mounted"
    run check_volumes
    assert_failure
}

@test "backup proceeds when volumes mounted" {
    run check_volumes
    assert_success
}

# ─── Logging ───

@test "backup writes completion to log" {
    do_backup
    run grep "DONE: backup complete" "${TEST_WORK}/backup.log"
    assert_success
}

# ─── Rotation ───

@test "rotation removes old snapshots" {
    # Create old snapshot
    mkdir -p "${TEST_WORK}/backup/snapshots/2020-01-01"
    touch -d "2020-01-01" "${TEST_WORK}/backup/snapshots/2020-01-01"
    rotate
    assert [ ! -d "${TEST_WORK}/backup/snapshots/2020-01-01" ]
}

@test "rotation keeps recent snapshots" {
    # Create yesterday's snapshot
    local yesterday
    yesterday=$(date -d "yesterday" +%Y-%m-%d 2>/dev/null || date -v-1d +%Y-%m-%d 2>/dev/null || echo "2026-03-27")
    mkdir -p "${TEST_WORK}/backup/snapshots/${yesterday}"
    rotate
    assert [ -d "${TEST_WORK}/backup/snapshots/${yesterday}" ]
}

@test "rotation with no snapshots does not error" {
    rm -rf "${TEST_WORK}/backup/snapshots"
    mkdir -p "${TEST_WORK}/backup/snapshots"
    run rotate
    assert_success
}