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config_conditions.go
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/
config_conditions.go
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package config
import (
"fmt"
"strings"
"github.com/coveo/gotemplate/collections"
"github.com/coveo/gotemplate/errors"
"github.com/gruntwork-io/terragrunt/options"
)
// RunConditions defines the rules that are evaluated in order to determine
type RunConditions struct {
Allows []Condition `hcl:"run_if"`
Denies []Condition `hcl:"ignore_if"`
}
func (c RunConditions) String() (result string) {
var sep string
if len(c.Denies) > 0 {
sep = "\n"
result += fmt.Sprintf("Ignore if %s", c.rules(c.Denies))
}
if len(c.Allows) > 0 {
result += fmt.Sprintf("%sRun if %s", sep, c.rules(c.Allows))
}
return result
}
// ShouldRun returns whether or not the current project should be run based on its run conditions and the variables in its options.
func (c RunConditions) ShouldRun() bool {
answer := true
for _, deny := range c.Denies {
ok, err := deny.isTrue()
if err != nil {
deny.options().Logger.Warningf("Ignoring project because %v in %s", err, deny)
answer = false
}
if ok {
deny.options().Logger.Warningf("Ignoring project because of ignore rule %s", deny)
answer = false
}
}
if !answer {
// There is at least one deny condition
return false
}
if len(c.Allows) == 0 {
// There is no run_if condition, so we
return true
}
options, hasErr := c.Allows[0].options(), false
answer = false
for _, allow := range c.Allows {
if result, err := allow.isTrue(); err != nil {
allow.options().Logger.Warningf("Ignoring project because %v in %s", err, allow)
hasErr = true
} else if result {
answer = true
}
}
if answer && !hasErr {
return true
}
if !answer {
options.Logger.Warningf("Ignoring project because running condition is not met: %s", c.rules(c.Allows))
}
return false
}
// Merge combines RunConditions from another source into the current one
func (c *RunConditions) Merge(imported RunConditions) {
c.Allows = append(c.Allows, imported.Allows...)
c.Denies = append(c.Denies, imported.Denies...)
}
func (c RunConditions) rules(conditions []Condition) string {
result := make([]string, len(conditions))
for i, condition := range conditions {
result[i] = fmt.Sprint(condition)
}
return strings.Join(result, " or ")
}
func (c *RunConditions) init(options *options.TerragruntOptions) (err error) {
if options.TerragruntRawConfig == nil {
// If there is no TerragruntRawConfig, we do not have to initialize the RunConditions
// object, we are probably in test context.
return nil
}
// There is a problem with the native hcl parser and we lost grouping in conditions
// so, we reinitialize the structure with the raw information
defer func() { err = errors.Trap(err, recover()) }()
dict := func(i interface{}) map[string]interface{} { return collections.AsDictionary(i).AsMap() }
list := func(i interface{}) []interface{} { return collections.AsList(i).AsArray() }
conditions := list(options.TerragruntRawConfig.Get("run_conditions"))
c.Allows, c.Denies = nil, nil
for _, condition := range conditions {
condition := dict(condition)
for _, allow := range list(condition["run_if"]) {
c.Allows = append(c.Allows, Condition(dict(allow)).init(options))
}
for _, deny := range list(condition["ignore_if"]) {
c.Denies = append(c.Denies, Condition(dict(deny)).init(options))
}
}
return
}
// Condition defines a single condition
type Condition map[string]interface{}
func (c Condition) options() *options.TerragruntOptions {
return c[optionsConfigKey].(*options.TerragruntOptions)
}
func (c Condition) getVariable(v string) string {
options := c.options()
if options == nil {
return v
}
if value, found := options.GetVariableValue(v); found {
return fmt.Sprint(value)
}
if value := SubstituteVars(v, options); value != v {
return value
}
return noValue
}
const noValue = "<no value>"
func (c Condition) String() string {
conditions := make([]string, 0, len(c))
for key, val := range c {
if list, _ := val.(collections.IGenericList); list != nil {
keyValue := c.getVariable(key)
keyValue = collections.IIf(keyValue == noValue, "", fmt.Sprintf("(%s)", keyValue)).(string)
if list.Len() == 1 {
conditions = append(conditions, fmt.Sprintf("%s%s = %s", key, keyValue, list.First()))
} else {
conditions = append(conditions, fmt.Sprintf("%s%s in [%s]", key, keyValue, list.Join(", ")))
}
}
}
return strings.Join(conditions, " and ")
}
const optionsConfigKey = "#config!"
func (c Condition) init(options *options.TerragruntOptions) Condition {
for key, val := range c {
list, _ := val.(collections.IGenericList)
if list != nil {
c[key] = collections.AsList(list)
} else {
c[key] = collections.NewList(fmt.Sprint(val))
}
}
c[optionsConfigKey] = options
return c
}
func (c Condition) isTrue() (bool, error) {
for key, values := range c {
if list, _ := values.(collections.IGenericList); list != nil {
v := c.getVariable(key)
if strings.Contains(v, noValue) {
return false, fmt.Errorf("variable undefined (%s)", key)
}
if !list.Contains(v) {
return false, nil
}
}
}
return true, nil
}