refactor(context): Implement more explicit merging of variables
The hierarchy for loading variables was previously not expressed explicitly. This commit refactors the logic for merging variables to explicitly set the different layers of variables as values on the context object and merge them for each resource set in `mergeContextValues`.
This commit is contained in:
parent
5cf9d53e80
commit
b33c353233
5 changed files with 96 additions and 62 deletions
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@ -43,11 +43,17 @@ type Context struct {
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Global map[string]interface{} `json:"global"`
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Global map[string]interface{} `json:"global"`
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// File names of YAML or JSON files including extra variables that should be globally accessible
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// File names of YAML or JSON files including extra variables that should be globally accessible
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VariableImports []string `json:"import"`
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VariableImportFiles []string `json:"import"`
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// The resource sets to include in this context
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// The resource sets to include in this context
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ResourceSets []ResourceSet `json:"include"`
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ResourceSets []ResourceSet `json:"include"`
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// Variables imported from additional files
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ImportedVars map[string]interface{}
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// Explicitly set variables (via `--var`) that should override all others
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ExplicitVars map[string]interface{}
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// This field represents the absolute path to the context base directory and should not be manually specified.
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// This field represents the absolute path to the context base directory and should not be manually specified.
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BaseDir string
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BaseDir string
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}
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}
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@ -57,41 +63,59 @@ func contextLoadingError(filename string, cause error) error {
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}
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}
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// Attempt to load and deserialise a Context from the specified file.
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// Attempt to load and deserialise a Context from the specified file.
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func LoadContextFromFile(filename string) (*Context, error) {
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func LoadContext(filename string, explicitVars *[]string) (*Context, error) {
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var c Context
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var ctx Context
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err := util.LoadJsonOrYaml(filename, &c)
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err := util.LoadJsonOrYaml(filename, &ctx)
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if err != nil {
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if err != nil {
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return nil, contextLoadingError(filename, err)
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return nil, contextLoadingError(filename, err)
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}
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}
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c.ResourceSets = flattenPrepareResourceSetPaths(&c.ResourceSets)
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ctx.BaseDir = path.Dir(filename)
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c.BaseDir = path.Dir(filename)
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c.ResourceSets = loadAllDefaultValues(&c)
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err = c.loadImportedVariables()
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// Prepare the resource sets by resolving parents etc.
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ctx.ResourceSets = flattenPrepareResourceSetPaths(&ctx.ResourceSets)
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// Add variables explicitly specified on the command line
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ctx.ExplicitVars, err = loadExplicitVars(explicitVars)
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if err != nil {
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return nil, fmt.Errorf("Error setting explicit variables: %v\n", err)
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}
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// Add variables loaded from import files
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ctx.ImportedVars, err = ctx.loadImportedVariables()
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if err != nil {
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if err != nil {
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return nil, contextLoadingError(filename, err)
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return nil, contextLoadingError(filename, err)
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}
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}
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return &c, nil
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// Merge variables (explicit > import > include > global > default)
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ctx.ResourceSets = ctx.mergeContextValues()
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if err != nil {
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return nil, contextLoadingError(filename, err)
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}
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return &ctx, nil
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}
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}
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// Kontemplate supports specifying additional variable files with the `import` keyword. This function loads those
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// Kontemplate supports specifying additional variable files with the
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// variable files and merges them together with the context's other global variables.
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// `import` keyword. This function loads those variable files and
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func (ctx *Context) loadImportedVariables() error {
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// merges them together with the context's other global variables.
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for _, file := range ctx.VariableImports {
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func (ctx *Context) loadImportedVariables() (map[string]interface{}, error) {
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allImportedVars := make(map[string]interface{})
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for _, file := range ctx.VariableImportFiles {
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var importedVars map[string]interface{}
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var importedVars map[string]interface{}
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err := util.LoadJsonOrYaml(path.Join(ctx.BaseDir, file), &importedVars)
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err := util.LoadJsonOrYaml(path.Join(ctx.BaseDir, file), &importedVars)
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if err != nil {
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if err != nil {
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return err
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return nil, err
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}
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}
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ctx.Global = *util.Merge(&ctx.Global, &importedVars)
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allImportedVars = *util.Merge(&allImportedVars, &importedVars)
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}
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}
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return nil
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return allImportedVars, nil
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}
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}
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// Correctly prepares the file paths for resource sets by inferring implicit paths and flattening resource set
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// Correctly prepares the file paths for resource sets by inferring implicit paths and flattening resource set
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@ -128,11 +152,16 @@ func flattenPrepareResourceSetPaths(rs *[]ResourceSet) []ResourceSet {
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return flattened
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return flattened
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}
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}
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func loadAllDefaultValues(c *Context) []ResourceSet {
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// Merges the context and resource set variables according in the
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updated := make([]ResourceSet, len(c.ResourceSets))
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// desired precedence order.
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func (ctx *Context) mergeContextValues() []ResourceSet {
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updated := make([]ResourceSet, len(ctx.ResourceSets))
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for i, rs := range c.ResourceSets {
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for i, rs := range ctx.ResourceSets {
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merged := loadDefaultValues(&rs, c)
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merged := loadDefaultValues(&rs, ctx)
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merged = util.Merge(&ctx.Global, merged)
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merged = util.Merge(merged, &ctx.ImportedVars)
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merged = util.Merge(merged, &ctx.ExplicitVars)
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rs.Values = *merged
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rs.Values = *merged
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updated[i] = rs
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updated[i] = rs
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}
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}
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@ -160,22 +189,19 @@ func loadDefaultValues(rs *ResourceSet, c *Context) *map[string]interface{} {
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return &rs.Values
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return &rs.Values
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}
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}
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// New variables can be defined or default values overridden with command line arguments when executing kontemplate.
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// Prepares the variables specified explicitly via `--var` when
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func (ctx *Context) SetVariablesFromArguments(vars *[]string) error {
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// executing kontemplate for adding to the context.
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// Resource set files might not have defined any global variables, if so we have to
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func loadExplicitVars(vars *[]string) (map[string]interface{}, error) {
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// create that a map before potentially writing variables into it
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explicitVars := make(map[string]interface{}, len(*vars))
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if ctx.Global == nil {
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ctx.Global = make(map[string]interface{}, len(*vars))
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}
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for _, v := range *vars {
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for _, v := range *vars {
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varParts := strings.Split(v, "=")
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varParts := strings.Split(v, "=")
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if len(varParts) != 2 {
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if len(varParts) != 2 {
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return fmt.Errorf(`invalid explicit variable provided (%s), name and value should be divided with "="`, v)
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return nil, fmt.Errorf(`invalid explicit variable provided (%s), name and value should be separated with "="`, v)
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}
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}
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ctx.Global[varParts[0]] = varParts[1]
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explicitVars[varParts[0]] = varParts[1]
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}
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}
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return nil
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return explicitVars, nil
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}
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}
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@ -14,8 +14,10 @@ import (
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"testing"
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"testing"
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)
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)
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var noExplicitVars []string = make([]string, 0)
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func TestLoadFlatContextFromFile(t *testing.T) {
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func TestLoadFlatContextFromFile(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/flat-test.yaml")
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ctx, err := LoadContext("testdata/flat-test.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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@ -35,12 +37,15 @@ func TestLoadFlatContextFromFile(t *testing.T) {
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"apiPort": float64(4567), // yep!
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"apiPort": float64(4567), // yep!
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"importantFeature": true,
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"importantFeature": true,
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"version": "1.0-0e6884d",
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"version": "1.0-0e6884d",
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"globalVar": "lizards",
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},
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},
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Include: nil,
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Include: nil,
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Parent: "",
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Parent: "",
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},
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},
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},
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},
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BaseDir: "testdata",
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BaseDir: "testdata",
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ImportedVars: make(map[string]interface{}, 0),
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ExplicitVars: make(map[string]interface{}, 0),
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}
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}
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if !reflect.DeepEqual(*ctx, expected) {
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if !reflect.DeepEqual(*ctx, expected) {
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@ -50,7 +55,7 @@ func TestLoadFlatContextFromFile(t *testing.T) {
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}
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}
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func TestLoadContextWithResourceSetCollections(t *testing.T) {
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func TestLoadContextWithResourceSetCollections(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/collections-test.yaml")
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ctx, err := LoadContext("testdata/collections-test.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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@ -70,6 +75,7 @@ func TestLoadContextWithResourceSetCollections(t *testing.T) {
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"apiPort": float64(4567), // yep!
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"apiPort": float64(4567), // yep!
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"importantFeature": true,
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"importantFeature": true,
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"version": "1.0-0e6884d",
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"version": "1.0-0e6884d",
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"globalVar": "lizards",
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},
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},
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Include: nil,
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Include: nil,
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Parent: "",
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Parent: "",
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@ -79,12 +85,15 @@ func TestLoadContextWithResourceSetCollections(t *testing.T) {
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Path: "collection/nested",
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Path: "collection/nested",
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Values: map[string]interface{}{
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Values: map[string]interface{}{
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"lizards": "good",
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"lizards": "good",
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"globalVar": "lizards",
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},
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},
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Include: nil,
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Include: nil,
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Parent: "collection",
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Parent: "collection",
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},
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},
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},
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},
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BaseDir: "testdata",
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BaseDir: "testdata",
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ImportedVars: make(map[string]interface{}, 0),
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ExplicitVars: make(map[string]interface{}, 0),
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}
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}
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if !reflect.DeepEqual(*ctx, expected) {
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if !reflect.DeepEqual(*ctx, expected) {
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@ -95,7 +104,7 @@ func TestLoadContextWithResourceSetCollections(t *testing.T) {
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}
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}
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func TestSubresourceVariableInheritance(t *testing.T) {
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func TestSubresourceVariableInheritance(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/parent-variables.yaml")
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ctx, err := LoadContext("testdata/parent-variables.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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@ -117,6 +126,8 @@ func TestSubresourceVariableInheritance(t *testing.T) {
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},
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},
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},
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},
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BaseDir: "testdata",
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BaseDir: "testdata",
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ImportedVars: make(map[string]interface{}, 0),
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ExplicitVars: make(map[string]interface{}, 0),
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}
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}
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if !reflect.DeepEqual(*ctx, expected) {
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if !reflect.DeepEqual(*ctx, expected) {
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@ -126,7 +137,7 @@ func TestSubresourceVariableInheritance(t *testing.T) {
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}
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}
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func TestSubresourceVariableInheritanceOverride(t *testing.T) {
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func TestSubresourceVariableInheritanceOverride(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/parent-variable-override.yaml")
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ctx, err := LoadContext("testdata/parent-variable-override.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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@ -147,6 +158,8 @@ func TestSubresourceVariableInheritanceOverride(t *testing.T) {
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},
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},
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},
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},
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BaseDir: "testdata",
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BaseDir: "testdata",
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ImportedVars: make(map[string]interface{}, 0),
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ExplicitVars: make(map[string]interface{}, 0),
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}
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}
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if !reflect.DeepEqual(*ctx, expected) {
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if !reflect.DeepEqual(*ctx, expected) {
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@ -156,7 +169,7 @@ func TestSubresourceVariableInheritanceOverride(t *testing.T) {
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}
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}
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func TestDefaultValuesLoading(t *testing.T) {
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func TestDefaultValuesLoading(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/default-loading.yaml")
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ctx, err := LoadContext("testdata/default-loading.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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t.Fail()
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t.Fail()
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@ -175,7 +188,7 @@ func TestDefaultValuesLoading(t *testing.T) {
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}
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}
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func TestImportValuesLoading(t *testing.T) {
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func TestImportValuesLoading(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/import-vars-simple.yaml")
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ctx, err := LoadContext("testdata/import-vars-simple.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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t.Fail()
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t.Fail()
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@ -189,14 +202,14 @@ func TestImportValuesLoading(t *testing.T) {
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},
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},
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}
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}
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if !reflect.DeepEqual(ctx.Global, expected) {
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if !reflect.DeepEqual(ctx.ImportedVars, expected) {
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t.Error("Expected global values after loading imports did not match!")
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t.Error("Expected imported values after loading imports did not match!")
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t.Fail()
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t.Fail()
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}
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}
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}
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}
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func TestImportValuesOverride(t *testing.T) {
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func TestValuesOverride(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/import-vars-override.yaml")
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ctx, err := LoadContext("testdata/import-vars-override.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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t.Fail()
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t.Fail()
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@ -208,18 +221,18 @@ func TestImportValuesOverride(t *testing.T) {
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"artist": "Pallida",
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"artist": "Pallida",
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"track": "Tractor Beam",
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"track": "Tractor Beam",
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},
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},
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"place": "Oslo",
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"place": "Oslo",
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"globalVar": "very global!",
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"globalVar": "very global!",
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}
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}
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if !reflect.DeepEqual(ctx.Global, expected) {
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if !reflect.DeepEqual(ctx.ResourceSets[0].Values, expected) {
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t.Error("Expected global values after loading imports did not match!")
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t.Error("Expected overrides after loading imports did not match!")
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t.Fail()
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t.Fail()
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}
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}
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}
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}
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func TestExplicitPathLoading(t *testing.T) {
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func TestExplicitPathLoading(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/explicit-path.yaml")
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ctx, err := LoadContext("testdata/explicit-path.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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t.Fail()
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t.Fail()
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@ -248,6 +261,8 @@ func TestExplicitPathLoading(t *testing.T) {
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},
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},
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},
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},
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BaseDir: "testdata",
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BaseDir: "testdata",
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ImportedVars: make(map[string]interface{}, 0),
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ExplicitVars: make(map[string]interface{}, 0),
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}
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}
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if !reflect.DeepEqual(*ctx, expected) {
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if !reflect.DeepEqual(*ctx, expected) {
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@ -257,7 +272,7 @@ func TestExplicitPathLoading(t *testing.T) {
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}
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}
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func TestExplicitSubresourcePathLoading(t *testing.T) {
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func TestExplicitSubresourcePathLoading(t *testing.T) {
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ctx, err := LoadContextFromFile("testdata/explicit-subresource-path.yaml")
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ctx, err := LoadContext("testdata/explicit-subresource-path.yaml", &noExplicitVars)
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if err != nil {
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if err != nil {
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t.Error(err)
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t.Error(err)
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t.Fail()
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t.Fail()
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@ -270,9 +285,12 @@ func TestExplicitSubresourcePathLoading(t *testing.T) {
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Name: "parent/child",
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Name: "parent/child",
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Path: "parent-path/child-path",
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Path: "parent-path/child-path",
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Parent: "parent",
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Parent: "parent",
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Values: make(map[string]interface{}, 0),
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},
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},
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},
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},
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BaseDir: "testdata",
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BaseDir: "testdata",
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ImportedVars: make(map[string]interface{}, 0),
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ExplicitVars: make(map[string]interface{}, 0),
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}
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}
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if !reflect.DeepEqual(*ctx, expected) {
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if !reflect.DeepEqual(*ctx, expected) {
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@ -283,22 +301,18 @@ func TestExplicitSubresourcePathLoading(t *testing.T) {
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func TestSetVariablesFromArguments(t *testing.T) {
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func TestSetVariablesFromArguments(t *testing.T) {
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vars := []string{"version=some-service-version"}
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vars := []string{"version=some-service-version"}
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ctx, _ := LoadContextFromFile("testdata/default-loading.yaml")
|
ctx, _ := LoadContext("testdata/default-loading.yaml", &vars)
|
||||||
|
|
||||||
if err := ctx.SetVariablesFromArguments(&vars); err != nil {
|
if version := ctx.ExplicitVars["version"]; version != "some-service-version" {
|
||||||
t.Error(err)
|
|
||||||
}
|
|
||||||
|
|
||||||
if version := ctx.Global["version"]; version != "some-service-version" {
|
|
||||||
t.Errorf(`Expected variable "version" to have value "some-service-version" but was "%s"`, version)
|
t.Errorf(`Expected variable "version" to have value "some-service-version" but was "%s"`, version)
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
func TestSetInvalidVariablesFromArguments(t *testing.T) {
|
func TestSetInvalidVariablesFromArguments(t *testing.T) {
|
||||||
vars := []string{"version: some-service-version"}
|
vars := []string{"version: some-service-version"}
|
||||||
ctx, _ := LoadContextFromFile("testdata/default-loading.yaml")
|
_, err := LoadContext("testdata/default-loading.yaml", &vars)
|
||||||
|
|
||||||
if err := ctx.SetVariablesFromArguments(&vars); err == nil {
|
if err == nil {
|
||||||
t.Error("Expected invalid variable to return an error")
|
t.Error("Expected invalid variable to return an error")
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
3
context/testdata/import-vars-override.yaml
vendored
3
context/testdata/import-vars-override.yaml
vendored
|
@ -6,4 +6,5 @@ global:
|
||||||
import:
|
import:
|
||||||
- test-vars.yaml
|
- test-vars.yaml
|
||||||
- test-vars-override.yaml
|
- test-vars-override.yaml
|
||||||
include: []
|
include:
|
||||||
|
- name: test-set
|
||||||
|
|
7
main.go
7
main.go
|
@ -184,16 +184,11 @@ func createCommand() {
|
||||||
}
|
}
|
||||||
|
|
||||||
func loadContextAndResources(file *string) (*context.Context, *[]templater.RenderedResourceSet) {
|
func loadContextAndResources(file *string) (*context.Context, *[]templater.RenderedResourceSet) {
|
||||||
ctx, err := context.LoadContextFromFile(*file)
|
ctx, err := context.LoadContext(*file, variables)
|
||||||
if err != nil {
|
if err != nil {
|
||||||
app.Fatalf("Error loading context: %v\n", err)
|
app.Fatalf("Error loading context: %v\n", err)
|
||||||
}
|
}
|
||||||
|
|
||||||
err = ctx.SetVariablesFromArguments(variables)
|
|
||||||
if err != nil {
|
|
||||||
app.Fatalf("Error setting explicit variables in context: %v\n", err)
|
|
||||||
}
|
|
||||||
|
|
||||||
resources, err := templater.LoadAndApplyTemplates(includes, excludes, ctx)
|
resources, err := templater.LoadAndApplyTemplates(includes, excludes, ctx)
|
||||||
if err != nil {
|
if err != nil {
|
||||||
app.Fatalf("Error templating resource sets: %v\n", err)
|
app.Fatalf("Error templating resource sets: %v\n", err)
|
||||||
|
|
|
@ -111,8 +111,6 @@ func templateFile(c *context.Context, rs *context.ResourceSet, filename string)
|
||||||
|
|
||||||
var b bytes.Buffer
|
var b bytes.Buffer
|
||||||
|
|
||||||
rs.Values = *util.Merge(&c.Global, &rs.Values)
|
|
||||||
|
|
||||||
err = tpl.Execute(&b, rs.Values)
|
err = tpl.Execute(&b, rs.Values)
|
||||||
|
|
||||||
if err != nil {
|
if err != nil {
|
||||||
|
|
Loading…
Reference in a new issue