Add some basic tests

.gitlab-ci.yml

+image: "$CI_REGISTRY_IMAGE"
+
+basic:
+  script: BATS_LIB_PATH="/root/bats" tests/help-and-version.bats -F junit > report.xml
+  artifacts:
+    reports:
+      junit: report.xml
+
+local:
+  tags:
+    - dind
+  script:
+    - sh -c 'for i in `seq 0 9`; do [ -e /dev/loop$i ] || mknod /dev/loop$i b 7 $i; done'
+    - BATS_LIB_PATH="/root/bats" tests/local-tests.bats -F junit > report.xml
+  artifacts:
+    reports:
+      junit: report.xml
+

tests/Dockerfile

+FROM alpine:latest
+
+ENV HOME=/root
+
+RUN apk --update add wget git bash sudo ncurses btrfs-progs util-linux-misc coreutils tar gpg
+
+# Get the newer release then the one available in Alpine
+RUN cd /root && wget -O - https://github.com/bats-core/bats-core/archive/refs/tags/v1.6.0.tar.gz | tar -xzf - && cd bats-core-* && ./install.sh /usr
+
+RUN cd /root && mkdir bats && cd bats && for i in bats-file bats-assert bats-support; do git clone https://github.com/bats-core/$i.git; done
+
+

tests/common_setup.bash

+#!/usr/bin/env bash
+
+_diskless_setup() {
+    ROOT_DIR="$(dirname "$( dirname "$BATS_TEST_FILENAME" )")"
+    [ -d "$ROOT_DIR" ]
+    bats_load_library 'bats-support'
+    bats_load_library 'bats-assert'
+}
+
+_disk_setup() {
+    sync
+    $SUDO btrfs subvol create "$ROOT_MOUNT"/@
+    $SUDO btrfs subvol create "$ROOT_MOUNT"/@other
+    $SUDO mount -t btrfs "$WD"/disk "$MAIN_MOUNT" -o subvol=@
+    $SUDO chmod a+rw "$MAIN_MOUNT"
+    $SUDO mount -t btrfs "$WD"/disk "$OTHER_MOUNT" -o subvol=@other
+    $SUDO chmod a+rw "$OTHER_MOUNT"
+    bats_load_library 'bats-file'
+    load "helpers.bash"
+}
+
+_remount_main() {
+    $SUDO umount "$MAIN_MOUNT"
+    $SUDO mount -t btrfs "$WD"/disk "$MAIN_MOUNT" -o subvol=@
+}
+
+_disk_teardown() {
+    $SUDO umount "$MAIN_MOUNT"
+    $SUDO umount "$OTHER_MOUNT"
+    for s in "$ROOT_MOUNT"/@*; do
+        $SUDO btrfs subvol delete "$s"
+    done
+    $SUDO rm -f "$ROOT_MOUNT"/*
+    sync
+}
+
+_disk_file_setup() {
+    SUDO=""
+    [ "$(id -u)" -eq 0 ] || SUDO=sudo
+    WD="$(mktemp -d schnapps-tests-XXXXXXX)"
+    dd if=/dev/zero of="$WD"/disk bs=1M count=250
+    mkfs.btrfs -L schnapps-test "$WD"/disk
+    ROOT_MOUNT="$WD"/mount-root
+    MAIN_MOUNT="$WD"/mount-main
+    OTHER_MOUNT="$WD"/mount-other
+    mkdir "$ROOT_MOUNT"
+    $SUDO mount -t btrfs "$WD"/disk "$ROOT_MOUNT"
+    mkdir "$MAIN_MOUNT"
+    mkdir "$OTHER_MOUNT"
+    export BATS_NO_PARALLELIZE_WITHIN_FILE=true
+    export SUDO MAIN_MOUNT OTHER_MOUNT ROOT_MOUNT WD
+}
+
+_disk_file_teardown() {
+    $SUDO umount "$ROOT_MOUNT"
+    rm -rf "$WD"
+}

tests/help-and-version.bats

+#!/usr/bin/env bats
+
+setup() {
+    load "common_setup.bash"
+    _diskless_setup
+}
+
+@test "Reports version" {
+    run "${ROOT_DIR}"/schnapps.sh version
+    assert_success
+    assert_output --partial '@VERSION@'
+}
+
+@test "Displays help" {
+    run "${ROOT_DIR}"/schnapps.sh help
+    assert_success
+    assert_output --partial 'Usage: schnapps'
+}
+

tests/helpers.bash

+#!/usr/bin/env bash
+
+create_dataset_A() {
+    pushd "$1"
+    mkdir -p a/aa/aaa
+    echo a > a/test
+    echo aa > a/aa/test
+    echo aaa > a/aa/aaa/test
+    echo nothing > test
+    popd
+}
+
+check_dataset_A() {
+    assert_dir_exists "$1"/a
+    assert_dir_exists "$1"/a/aa
+    assert_dir_exists "$1"/a/aa/aaa
+    assert_file_exists "$1"/test
+    assert_file_contains "$1"/test '^nothing$'
+    assert_file_exists "$1"/a/test
+    assert_file_contains "$1"/a/test '^a$'
+    assert_file_exists "$1"/a/aa/test
+    assert_file_contains "$1"/a/aa/test '^aa$'
+    assert_file_exists "$1"/a/aa/aaa/test
+    assert_file_contains "$1"/a/aa/aaa/test '^aaa$'
+}
+
+change_dataset_A_to_AB() {
+    pushd "$1"
+    echo ab > a/test
+    echo aabb > a/aa/test
+    rm -rf a/aa/aaa
+    popd
+}
+
+check_dataset_AB() {
+    assert_dir_exists "$1"/a
+    assert_dir_exists "$1"/a/aa
+    assert_dir_not_exists "$1"/a/aa/aaa
+    assert_file_exists "$1"/test
+    assert_file_contains "$1"/test '^nothing$'
+    assert_file_exists "$1"/a/test
+    assert_file_contains "$1"/a/test '^ab$'
+    assert_file_exists "$1"/a/aa/test
+    assert_file_contains "$1"/a/aa/test '^aabb$'
+    assert_file_not_exists "$1"/a/aaa/test
+}

tests/local-tests.bats

+#!/usr/bin/env bats
+
+setup_file() {
+    load "common_setup.bash"
+    _disk_file_setup
+}
+
+setup() {
+    load "common_setup.bash"
+    _diskless_setup
+    _disk_setup
+}
+
+teardown() {
+    _disk_teardown
+}
+
+teardown_file() {
+    _disk_file_teardown
+}
+
+@test "List works" {
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" list
+    assert_success
+    assert_output --regexp "Type.*Size.*Date.*Description"
+}
+
+@test "Snapshot creation works" {
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" create Testing snapshot
+    assert_success
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" list
+    assert_output --partial "Testing snapshot"
+    assert_dir_exists "$ROOT_MOUNT"/@1
+    assert_file_exists "$ROOT_MOUNT"/1.info
+}
+
+@test "Snapshot are really snapshots" {
+    create_dataset_A "$MAIN_MOUNT"
+    check_dataset_A "$MAIN_MOUNT"
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" create Testing snapshot
+    assert_success
+    change_dataset_A_to_AB "$MAIN_MOUNT"
+    check_dataset_AB "$MAIN_MOUNT"
+    check_dataset_A "$ROOT_MOUNT"/@1
+}
+
+@test "Rollback works" {
+    create_dataset_A "$MAIN_MOUNT"
+    check_dataset_A "$MAIN_MOUNT"
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" create Testing snapshot
+    assert_success
+    change_dataset_A_to_AB "$MAIN_MOUNT"
+    check_dataset_AB "$MAIN_MOUNT"
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" rollback
+    _remount_main
+    check_dataset_A "$MAIN_MOUNT"
+}
+
+@test "Delete works" {
+    create_dataset_A "$MAIN_MOUNT"
+    check_dataset_A "$MAIN_MOUNT"
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" create Testing snapshot
+    assert_success
+    assert_dir_exists "$ROOT_MOUNT"/@1
+    assert_file_exists "$ROOT_MOUNT"/1.info
+    run $SUDO "${ROOT_DIR}"/schnapps.sh -d "$MAIN_MOUNT" delete 1
+    assert_success
+    assert_dir_not_exists "$ROOT_MOUNT"/@1
+    assert_file_not_exists "$ROOT_MOUNT"/1.info
+}