Add RetriedProvisioner to allow retry provisioners (#9061)

.circleci/config.yml

@@ -51,6 +51,7 @@ commands:
 jobs:
   test-linux:
     executor: golang
+    resource_class: large
     working_directory: /go/src/github.com/hashicorp/packer
     steps:
       - checkout

hcl2template/common_test.go

@@ -207,6 +207,23 @@ var (
 		},
 	}
 
+	emptyMockBuilder = &MockBuilder{
+		Config: MockConfig{
+			NestedMockConfig: NestedMockConfig{
+				Tags: []MockTag{},
+			},
+			Nested:      NestedMockConfig{},
+			NestedSlice: []NestedMockConfig{},
+		},
+	}
+
+	emptyMockProvisioner = &MockProvisioner{
+		Config: MockConfig{
+			NestedMockConfig: NestedMockConfig{Tags: []MockTag{}},
+			NestedSlice:      []NestedMockConfig{},
+		},
+	}
+
 	dynamicTagList = []MockTag{
 		{
 			Key:   "first_tag_key",

hcl2template/testdata/build/provisioner_paused_before_retry.pkr.hcl

@@ -0,0 +1,15 @@
+
+// starts resources to provision them.
+build {
+    sources = [
+        "source.virtualbox-iso.ubuntu-1204"
+    ]
+
+    provisioner "shell" {
+        pause_before = "10s"
+        max_retries = 5
+    }
+}
+
+source "virtualbox-iso" "ubuntu-1204" {
+}

hcl2template/testdata/build/provisioner_timeout.pkr.hcl

@@ -0,0 +1,14 @@
+
+// starts resources to provision them.
+build {
+    sources = [
+        "source.virtualbox-iso.ubuntu-1204"
+    ]
+
+    provisioner "shell" {
+        timeout = "10s"
+    }
+}
+
+source "virtualbox-iso" "ubuntu-1204" {
+}

hcl2template/types.build.provisioners.go

@@ -2,6 +2,7 @@ package hcl2template
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/gohcl"
@@ -10,8 +11,11 @@ import (
 
 // ProvisionerBlock references a detected but unparsed provisioner
 type ProvisionerBlock struct {
-	PType string
-	PName string
+	PType       string
+	PName       string
+	PauseBefore time.Duration
+	MaxRetries  int
+	Timeout     time.Duration
 	HCL2Ref
 }
 
@@ -21,17 +25,44 @@ func (p *ProvisionerBlock) String() string {
 
 func (p *Parser) decodeProvisioner(block *hcl.Block) (*ProvisionerBlock, hcl.Diagnostics) {
 	var b struct {
-		Name string   `hcl:"name,optional"`
-		Rest hcl.Body `hcl:",remain"`
+		Name        string   `hcl:"name,optional"`
+		PauseBefore string   `hcl:"pause_before,optional"`
+		MaxRetries  int      `hcl:"max_retries,optional"`
+		Timeout     string   `hcl:"timeout,optional"`
+		Rest        hcl.Body `hcl:",remain"`
 	}
 	diags := gohcl.DecodeBody(block.Body, nil, &b)
 	if diags.HasErrors() {
 		return nil, diags
 	}
+
 	provisioner := &ProvisionerBlock{
-		PType:   block.Labels[0],
-		PName:   b.Name,
-		HCL2Ref: newHCL2Ref(block, b.Rest),
+		PType:      block.Labels[0],
+		PName:      b.Name,
+		MaxRetries: b.MaxRetries,
+		HCL2Ref:    newHCL2Ref(block, b.Rest),
+	}
+
+	if b.PauseBefore != "" {
+		pauseBefore, err := time.ParseDuration(b.PauseBefore)
+		if err != nil {
+			return nil, append(diags, &hcl.Diagnostic{
+				Summary: "Failed to parse pause_before duration",
+				Detail:  err.Error(),
+			})
+		}
+		provisioner.PauseBefore = pauseBefore
+	}
+
+	if b.Timeout != "" {
+		timeout, err := time.ParseDuration(b.Timeout)
+		if err != nil {
+			return nil, append(diags, &hcl.Diagnostic{
+				Summary: "Failed to parse timeout duration",
+				Detail:  err.Error(),
+			})
+		}
+		provisioner.Timeout = timeout
 	}
 
 	if !p.ProvisionersSchemas.Has(provisioner.PType) {

hcl2template/types.packer_config.go

@@ -195,6 +195,26 @@ func (p *Parser) getCoreBuildProvisioners(source *SourceBlock, blocks []*Provisi
 		if moreDiags.HasErrors() {
 			continue
 		}
+
+		// If we're pausing, we wrap the provisioner in a special pauser.
+		if pb.PauseBefore != 0 {
+			provisioner = &packer.PausedProvisioner{
+				PauseBefore: pb.PauseBefore,
+				Provisioner: provisioner,
+			}
+		} else if pb.Timeout != 0 {
+			provisioner = &packer.TimeoutProvisioner{
+				Timeout:     pb.Timeout,
+				Provisioner: provisioner,
+			}
+		}
+		if pb.MaxRetries != 0 {
+			provisioner = &packer.RetriedProvisioner{
+				MaxRetries:  pb.MaxRetries,
+				Provisioner: provisioner,
+			}
+		}
+
 		res = append(res, packer.CoreBuildProvisioner{
 			PType:       pb.PType,
 			PName:       pb.PName,

hcl2template/types.packer_config_test.go

@@ -1,7 +1,9 @@
 package hcl2template
 
 import (
+	"path/filepath"
 	"testing"
+	"time"
 
 	"github.com/hashicorp/packer/packer"
 	"github.com/zclconf/go-cty/cty"
@@ -173,6 +175,90 @@ func TestParser_complete(t *testing.T) {
 			parseWantDiags:         true,
 			parseWantDiagHasErrors: true,
 		},
+		{"provisioner with wrappers pause_before and max_retriers",
+			defaultParser,
+			parseTestArgs{"testdata/build/provisioner_paused_before_retry.pkr.hcl", nil, nil},
+			&PackerConfig{
+				Basedir: filepath.Join("testdata", "build"),
+				Sources: map[SourceRef]*SourceBlock{
+					refVBIsoUbuntu1204: {Type: "virtualbox-iso", Name: "ubuntu-1204"},
+				},
+				Builds: Builds{
+					&BuildBlock{
+						Sources: []SourceRef{refVBIsoUbuntu1204},
+						ProvisionerBlocks: []*ProvisionerBlock{
+							{
+								PType:       "shell",
+								PauseBefore: time.Second * 10,
+								MaxRetries:  5,
+							},
+						},
+					},
+				},
+			},
+			false, false,
+			[]packer.Build{
+				&packer.CoreBuild{
+					Type:     "virtualbox-iso",
+					Prepared: true,
+					Builder:  emptyMockBuilder,
+					Provisioners: []packer.CoreBuildProvisioner{
+						{
+							PType: "shell",
+							Provisioner: &packer.RetriedProvisioner{
+								MaxRetries: 5,
+								Provisioner: &packer.PausedProvisioner{
+									PauseBefore: time.Second * 10,
+									Provisioner: emptyMockProvisioner,
+								},
+							},
+						},
+					},
+					PostProcessors: [][]packer.CoreBuildPostProcessor{},
+				},
+			},
+			false,
+		},
+		{"provisioner with wrappers timeout",
+			defaultParser,
+			parseTestArgs{"testdata/build/provisioner_timeout.pkr.hcl", nil, nil},
+			&PackerConfig{
+				Basedir: filepath.Join("testdata", "build"),
+				Sources: map[SourceRef]*SourceBlock{
+					refVBIsoUbuntu1204: {Type: "virtualbox-iso", Name: "ubuntu-1204"},
+				},
+				Builds: Builds{
+					&BuildBlock{
+						Sources: []SourceRef{refVBIsoUbuntu1204},
+						ProvisionerBlocks: []*ProvisionerBlock{
+							{
+								PType:   "shell",
+								Timeout: time.Second * 10,
+							},
+						},
+					},
+				},
+			},
+			false, false,
+			[]packer.Build{
+				&packer.CoreBuild{
+					Type:     "virtualbox-iso",
+					Prepared: true,
+					Builder:  emptyMockBuilder,
+					Provisioners: []packer.CoreBuildProvisioner{
+						{
+							PType: "shell",
+							Provisioner: &packer.TimeoutProvisioner{
+								Timeout:     time.Second * 10,
+								Provisioner: emptyMockProvisioner,
+							},
+						},
+					},
+					PostProcessors: [][]packer.CoreBuildPostProcessor{},
+				},
+			},
+			false,
+		},
 	}
 	testParse(t, tests)
 }

packer/builder_mock.hcl2spec.go

@@ -155,6 +155,7 @@ type FlatMockProvisioner struct {
 	PrepCalled       *bool         `cty:"prep_called"`
 	PrepConfigs      []interface{} `cty:"prep_configs"`
 	ProvCalled       *bool         `cty:"prov_called"`
+	ProvRetried      *bool         `cty:"prov_retried"`
 	ProvCommunicator Communicator  `cty:"prov_communicator"`
 	ProvUi           Ui            `cty:"prov_ui"`
 }
@@ -174,6 +175,7 @@ func (*FlatMockProvisioner) HCL2Spec() map[string]hcldec.Spec {
 		"prep_called":       &hcldec.AttrSpec{Name: "prep_called", Type: cty.Bool, Required: false},
 		"prep_configs":      &hcldec.AttrSpec{Name: "prep_configs", Type: cty.Bool, Required: false}, /* TODO(azr): could not find type */
 		"prov_called":       &hcldec.AttrSpec{Name: "prov_called", Type: cty.Bool, Required: false},
+		"prov_retried":      &hcldec.AttrSpec{Name: "prov_retried", Type: cty.Bool, Required: false},
 		"prov_communicator": &hcldec.AttrSpec{Name: "prov_communicator", Type: cty.Bool, Required: false}, /* TODO(azr): could not find type */
 		"prov_ui":           &hcldec.AttrSpec{Name: "prov_ui", Type: cty.Bool, Required: false},           /* TODO(azr): could not find type */
 	}

packer/core.go

@@ -170,6 +170,12 @@ func (c *Core) generateCoreBuildProvisioner(rawP *template.Provisioner, rawName
 			Provisioner: provisioner,
 		}
 	}
+	if rawP.MaxRetries != 0 {
+		provisioner = &RetriedProvisioner{
+			MaxRetries:  rawP.MaxRetries,
+			Provisioner: provisioner,
+		}
+	}
 	cbp = CoreBuildProvisioner{
 		PType:       rawP.Type,
 		Provisioner: provisioner,

packer/core_test.go

@@ -2,6 +2,7 @@ package packer
 
 import (
 	"context"
+	"errors"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -786,3 +787,42 @@ func testCoreTemplate(t *testing.T, c *CoreConfig, p string) {
 
 	c.Template = tpl
 }
+
+func TestCoreBuild_provRetry(t *testing.T) {
+	config := TestCoreConfig(t)
+	testCoreTemplate(t, config, fixtureDir("build-prov-retry.json"))
+	b := TestBuilder(t, config, "test")
+	p := TestProvisioner(t, config, "test")
+	core := TestCore(t, config)
+
+	b.ArtifactId = "hello"
+
+	build, err := core.Build("test")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if _, err := build.Prepare(); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	ui := testUi()
+	p.ProvFunc = func(ctx context.Context) error {
+		return errors.New("failed")
+	}
+
+	artifact, err := build.Run(context.Background(), ui)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if len(artifact) != 1 {
+		t.Fatalf("bad: %#v", artifact)
+	}
+
+	if artifact[0].Id() != b.ArtifactId {
+		t.Fatalf("bad: %s", artifact[0].Id())
+	}
+	if !p.ProvRetried {
+		t.Fatal("provisioner should retry")
+	}
+}

packer/provisioner.go

@@ -162,6 +162,48 @@ func (p *PausedProvisioner) Provision(ctx context.Context, ui Ui, comm Communica
 	return p.Provisioner.Provision(ctx, ui, comm, generatedData)
 }
 
+// RetriedProvisioner is a Provisioner implementation that retries
+// the provisioner whenever there's an error.
+type RetriedProvisioner struct {
+	MaxRetries  int
+	Provisioner Provisioner
+}
+
+func (r *RetriedProvisioner) ConfigSpec() hcldec.ObjectSpec { return r.ConfigSpec() }
+func (r *RetriedProvisioner) FlatConfig() interface{}       { return r.FlatConfig() }
+func (r *RetriedProvisioner) Prepare(raws ...interface{}) error {
+	return r.Provisioner.Prepare(raws...)
+}
+
+func (r *RetriedProvisioner) Provision(ctx context.Context, ui Ui, comm Communicator, generatedData map[string]interface{}) error {
+	if ctx.Err() != nil { // context was cancelled
+		return ctx.Err()
+	}
+
+	err := r.Provisioner.Provision(ctx, ui, comm, generatedData)
+	if err == nil {
+		return nil
+	}
+
+	leftTries := r.MaxRetries
+	for ; leftTries > 0; leftTries-- {
+		if ctx.Err() != nil { // context was cancelled
+			return ctx.Err()
+		}
+
+		ui.Say(fmt.Sprintf("Provisioner failed with %q, retrying with %d trie(s) left", err, leftTries))
+
+		err := r.Provisioner.Provision(ctx, ui, comm, generatedData)
+		if err == nil {
+			return nil
+		}
+
+	}
+	ui.Say("retry limit reached.")
+
+	return err
+}
+
 // DebuggedProvisioner is a Provisioner implementation that waits until a key
 // press before the provisioner is actually run.
 type DebuggedProvisioner struct {

packer/provisioner_mock.go

@@ -14,6 +14,7 @@ type MockProvisioner struct {
 	PrepCalled       bool
 	PrepConfigs      []interface{}
 	ProvCalled       bool
+	ProvRetried      bool
 	ProvCommunicator Communicator
 	ProvUi           Ui
 }
@@ -29,6 +30,11 @@ func (t *MockProvisioner) Prepare(configs ...interface{}) error {
 }
 
 func (t *MockProvisioner) Provision(ctx context.Context, ui Ui, comm Communicator, generatedData map[string]interface{}) error {
+	if t.ProvCalled {
+		t.ProvRetried = true
+		return nil
+	}
+
 	t.ProvCalled = true
 	t.ProvCommunicator = comm
 	t.ProvUi = ui

packer/provisioner_test.go

@@ -2,6 +2,7 @@ package packer
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"testing"
 	"time"
@@ -229,3 +230,114 @@ func TestDebuggedProvisionerCancel(t *testing.T) {
 		t.Fatal("should have error")
 	}
 }
+
+func TestRetriedProvisioner_impl(t *testing.T) {
+	var _ Provisioner = new(RetriedProvisioner)
+}
+
+func TestRetriedProvisionerPrepare(t *testing.T) {
+	mock := new(MockProvisioner)
+	prov := &RetriedProvisioner{
+		Provisioner: mock,
+	}
+
+	err := prov.Prepare(42)
+	if err != nil {
+		t.Fatal("should not have errored")
+	}
+	if !mock.PrepCalled {
+		t.Fatal("prepare should be called")
+	}
+	if mock.PrepConfigs[0] != 42 {
+		t.Fatal("should have proper configs")
+	}
+}
+
+func TestRetriedProvisionerProvision(t *testing.T) {
+	mock := &MockProvisioner{
+		ProvFunc: func(ctx context.Context) error {
+			return errors.New("failed")
+		},
+	}
+
+	prov := &RetriedProvisioner{
+		MaxRetries:  2,
+		Provisioner: mock,
+	}
+
+	ui := testUi()
+	comm := new(MockCommunicator)
+	err := prov.Provision(context.Background(), ui, comm, make(map[string]interface{}))
+	if err != nil {
+		t.Fatal("should not have errored")
+	}
+	if !mock.ProvCalled {
+		t.Fatal("prov should be called")
+	}
+	if !mock.ProvRetried {
+		t.Fatal("prov should be retried")
+	}
+	if mock.ProvUi != ui {
+		t.Fatal("should have proper ui")
+	}
+	if mock.ProvCommunicator != comm {
+		t.Fatal("should have proper comm")
+	}
+}
+
+func TestRetriedProvisionerCancelledProvision(t *testing.T) {
+	// Don't retry if context is cancelled
+	ctx, topCtxCancel := context.WithCancel(context.Background())
+
+	mock := &MockProvisioner{
+		ProvFunc: func(ctx context.Context) error {
+			topCtxCancel()
+			<-ctx.Done()
+			return ctx.Err()
+		},
+	}
+
+	prov := &RetriedProvisioner{
+		MaxRetries:  2,
+		Provisioner: mock,
+	}
+
+	ui := testUi()
+	comm := new(MockCommunicator)
+	err := prov.Provision(ctx, ui, comm, make(map[string]interface{}))
+	if err == nil {
+		t.Fatal("should have errored")
+	}
+	if !mock.ProvCalled {
+		t.Fatal("prov should be called")
+	}
+	if mock.ProvRetried {
+		t.Fatal("prov should NOT be retried")
+	}
+	if mock.ProvUi != ui {
+		t.Fatal("should have proper ui")
+	}
+	if mock.ProvCommunicator != comm {
+		t.Fatal("should have proper comm")
+	}
+}
+
+func TestRetriedProvisionerCancel(t *testing.T) {
+	topCtx, cancelTopCtx := context.WithCancel(context.Background())
+
+	mock := new(MockProvisioner)
+	prov := &RetriedProvisioner{
+		Provisioner: mock,
+	}
+
+	mock.ProvFunc = func(ctx context.Context) error {
+		cancelTopCtx()
+		<-ctx.Done()
+		return ctx.Err()
+	}
+
+	err := prov.Provision(topCtx, testUi(), new(MockCommunicator), make(map[string]interface{}))
+	if err == nil {
+		t.Fatal("should have err")
+	}
+}

packer/test-fixtures/build-prov-retry.json

@@ -0,0 +1,10 @@
+{
+    "builders": [{
+        "type": "test"
+    }],
+
+    "provisioners": [{
+        "type": "test",
+        "max_retries": 1
+    }]
+}

provisioner/shell-local/provisioner_acc_test.go

@@ -0,0 +1,64 @@
+package shell_test
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/hashicorp/packer/helper/tests/acc"
+	"github.com/hashicorp/packer/provisioner/shell"
+
+	"github.com/hashicorp/packer/packer"
+
+	"github.com/hashicorp/packer/command"
+)
+
+func TestShellLocalProvisionerWithRetryOption(t *testing.T) {
+	acc.TestProvisionersPreCheck("shell-local", t)
+	acc.TestProvisionersAgainstBuilders(new(ShellLocalProvisionerAccTest), t)
+}
+
+type ShellLocalProvisionerAccTest struct{}
+
+func (s *ShellLocalProvisionerAccTest) GetName() string {
+	return "file"
+}
+
+func (s *ShellLocalProvisionerAccTest) GetConfig() (string, error) {
+	filePath := filepath.Join("./test-fixtures", "shell-local-provisioner.txt")
+	config, err := os.Open(filePath)
+	if err != nil {
+		return "", fmt.Errorf("Expected to find %s", filePath)
+	}
+	defer config.Close()
+
+	file, err := ioutil.ReadAll(config)
+	return string(file), err
+}
+
+func (s *ShellLocalProvisionerAccTest) GetProvisionerStore() packer.MapOfProvisioner {
+	return packer.MapOfProvisioner{
+		"shell-local": func() (packer.Provisioner, error) { return &shell.Provisioner{}, nil },
+	}
+}
+
+func (s *ShellLocalProvisionerAccTest) IsCompatible(builder string, vmOS string) bool {
+	return vmOS == "linux"
+}
+
+func (s *ShellLocalProvisionerAccTest) RunTest(c *command.BuildCommand, args []string) error {
+	if code := c.Run(args); code != 0 {
+		ui := c.Meta.Ui.(*packer.BasicUi)
+		out := ui.Writer.(*bytes.Buffer)
+		err := ui.ErrorWriter.(*bytes.Buffer)
+		return fmt.Errorf(
+			"Bad exit code.\n\nStdout:\n\n%s\n\nStderr:\n\n%s",
+			out.String(),
+			err.String())
+	}
+
+	return nil
+}

provisioner/shell-local/test-fixtures/script.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+if [[ ! -f file.txt ]] ; then
+    echo 'hello' > file.txt
+    exit 1
+fi

provisioner/shell-local/test-fixtures/shell-local-provisioner.txt

@@ -0,0 +1,5 @@
+{
+    "type": "shell-local",
+    "script": "test-fixtures/script.sh",
+    "max_retries" : 5
+}

template/parse.go

@@ -76,6 +76,7 @@ func (r *rawTemplate) decodeProvisioner(raw interface{}) (Provisioner, error) {
 	delete(p.Config, "only")
 	delete(p.Config, "override")
 	delete(p.Config, "pause_before")
+	delete(p.Config, "max_retries")
 	delete(p.Config, "type")
 	delete(p.Config, "timeout")
 

template/parse_test.go

@@ -106,6 +106,19 @@ func TestParse(t *testing.T) {
 			false,
 		},
 
+		{
+			"parse-provisioner-retry.json",
+			&Template{
+				Provisioners: []*Provisioner{
+					{
+						Type:       "something",
+						MaxRetries: 5,
+					},
+				},
+			},
+			false,
+		},
+
 		{
 			"parse-provisioner-timeout.json",
 			&Template{

template/template.go

@@ -141,6 +141,7 @@ type Provisioner struct {
 	Config      map[string]interface{} `json:"config,omitempty"`
 	Override    map[string]interface{} `json:"override,omitempty"`
 	PauseBefore time.Duration          `mapstructure:"pause_before" json:"pause_before,omitempty"`
+	MaxRetries  int                    `mapstructure:"max_retries" json:"max_retries,omitempty"`
 	Timeout     time.Duration          `mapstructure:"timeout" json:"timeout,omitempty"`
 }
 

template/template.hcl2spec.go

@@ -15,6 +15,7 @@ type FlatProvisioner struct {
 	Config      map[string]interface{} `json:"config,omitempty" cty:"config"`
 	Override    map[string]interface{} `json:"override,omitempty" cty:"override"`
 	PauseBefore *string                `mapstructure:"pause_before" json:"pause_before,omitempty" cty:"pause_before"`
+	MaxRetries  *int                   `mapstructure:"max_retries" json:"max_retries,omitempty" cty:"max_retries"`
 	Timeout     *string                `mapstructure:"timeout" json:"timeout,omitempty" cty:"timeout"`
 }
 
@@ -36,6 +37,7 @@ func (*FlatProvisioner) HCL2Spec() map[string]hcldec.Spec {
 		"config":       &hcldec.AttrSpec{Name: "config", Type: cty.Map(cty.String), Required: false},
 		"override":     &hcldec.AttrSpec{Name: "override", Type: cty.Map(cty.String), Required: false},
 		"pause_before": &hcldec.AttrSpec{Name: "pause_before", Type: cty.String, Required: false},
+		"max_retries":  &hcldec.AttrSpec{Name: "max_retries", Type: cty.Number, Required: false},
 		"timeout":      &hcldec.AttrSpec{Name: "timeout", Type: cty.String, Required: false},
 	}
 	return s

template/test-fixtures/parse-provisioner-retry.json

@@ -0,0 +1,8 @@
+{
+    "provisioners": [
+        {
+            "type": "something",
+            "max_retries": 5
+        }
+    ]
+}

website/pages/docs/templates/provisioners.mdx

@@ -177,6 +177,27 @@ that provisioner. By default, there is no pause. An example is shown below:
 For the above provisioner, Packer will wait 10 seconds before uploading and
 executing the shell script.
 
+## Retry on error
+
+With certain provisioners it is sometimes desirable to retry when it fails.
+Specifically, in cases where the provisioner depends on external processes that are not done yet.
+
+
+Every provisioner definition in a Packer template can take a special
+configuration `max_retries` that is the maximum number of times a provisioner will retry on error.
+By default, there `max_retries` is zero and there is no retry on error. An example is shown below:
+
+```json
+{
+  "type": "shell",
+  "script": "script.sh",
+  "max_retries": 5
+}
+```
+
+For the above provisioner, Packer will retry maximum five times until stops failing.
+If after five retries the provisioner still fails, then the complete build will fail.
+
 ## Timeout
 
 Sometimes a command can take much more time than expected

website/pages/partials/provisioners/common-config.mdx

@@ -2,6 +2,8 @@ Parameters common to all provisioners:
 
 - `pause_before` (duration) - Sleep for duration before execution.
 
+- `max_retries` (int) - Max times the provisioner will retry in case of failure. Defaults to zero (0). Zero means an error will not be retried.
+
 - `only` (array of string) - Only run the provisioner for listed builder(s)
   by name.