Add database command

- Allows to override the system db and create/remove entries as desired.
  The input format is the same metadata as the one generated by the
  artifacts. It contains the Package and the file list that we need.
- Add integration test

Closes #47

tests/integration/18_database.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+export LUET_NOLOCK=true
+
+oneTimeSetUp() {
+export tmpdir="$(mktemp -d)"
+}
+
+oneTimeTearDown() {
+    rm -rf "$tmpdir"
+}
+
+testBuild() {
+    mkdir $tmpdir/testbuild
+    luet build --tree "$ROOT_DIR/tests/fixtures/buildableseed" --destination $tmpdir/testbuild --compression gzip test/c #> /dev/null
+    buildst=$?
+    assertEquals 'builds successfully' "$buildst" "0"
+    assertTrue 'create package dep B' "[ -e '$tmpdir/testbuild/b-test-1.0.package.tar.gz' ]"
+    assertTrue 'create package' "[ -e '$tmpdir/testbuild/c-test-1.0.package.tar.gz' ]"
+}
+
+testRepo() {
+    assertTrue 'no repository' "[ ! -e '$tmpdir/testbuild/repository.yaml' ]"
+    luet create-repo --tree "$ROOT_DIR/tests/fixtures/buildableseed" \
+    --output $tmpdir/testbuild \
+    --packages $tmpdir/testbuild \
+    --name "test" \
+    --descr "Test Repo" \
+    --urls $tmpdir/testrootfs \
+    --type disk > /dev/null
+
+    createst=$?
+    assertEquals 'create repo successfully' "$createst" "0"
+    assertTrue 'create repository' "[ -e '$tmpdir/testbuild/repository.yaml' ]"
+}
+
+testConfig() {
+    mkdir $tmpdir/testrootfs
+    cat <<EOF > $tmpdir/luet.yaml
+general:
+  debug: true
+system:
+  rootfs: $tmpdir/testrootfs
+  database_path: "/"
+  database_engine: "boltdb"
+repositories:
+   - name: "main"
+     type: "disk"
+     enable: true
+     urls:
+       - "$tmpdir/testbuild"
+EOF
+    luet config --config $tmpdir/luet.yaml
+    res=$?
+    assertEquals 'config test successfully' "$res" "0"
+}
+
+testDatabase() {
+    luet database create --config $tmpdir/luet.yaml $tmpdir/testbuild/c-test-1.0.metadata.yaml
+    #luet install --config $tmpdir/luet.yaml test/c-1.0 > /dev/null
+    createst=$?
+    assertEquals 'created package successfully' "$createst" "0"
+    assertTrue 'package not installed' "[ ! -e '$tmpdir/testrootfs/c' ]"
+
+    installed=$(luet --config $tmpdir/luet.yaml search --installed .)
+    searchst=$?
+    assertEquals 'search exists successfully' "$searchst" "0"
+    assertContains 'contains test/c-1.0' "$installed" 'test/c-1.0'
+    touch $tmpdir/testrootfs/c
+    
+    luet database remove --config $tmpdir/luet.yaml test/c-1.0
+    removetest=$?
+    assertEquals 'package removed successfully' "$removetest" "0"
+    assertTrue 'file not touched' "[ -e '$tmpdir/testrootfs/c' ]"
+
+    luet database create --config $tmpdir/luet.yaml $tmpdir/testbuild/c-test-1.0.metadata.yaml
+    #luet install --config $tmpdir/luet.yaml test/c-1.0 > /dev/null
+    createst=$?
+    assertEquals 'created package successfully' "$createst" "0"
+    assertTrue 'file still present' "[ -e '$tmpdir/testrootfs/c' ]"
+    
+    luet uninstall --config $tmpdir/luet.yaml test/c
+    installst=$?
+    assertEquals 'uninstall test successfully' "$installst" "0"
+    assertTrue 'package uninstalled' "[ ! -e '$tmpdir/testrootfs/c' ]"
+}
+
+# Load shUnit2.
+. "$ROOT_DIR/tests/integration/shunit2"/shunit2
+