fix: show a 100% cost increase with prior empty projects

cmd/infracost/diff_test.go

@@ -320,3 +320,17 @@ func TestDiffWithPolicyDataUpload(t *testing.T) {
 		},
 	)
 }
+
+func TestDiffPriorEmptyProject(t *testing.T) {
+	testName := testutil.CalcGoldenFileTestdataDirName()
+	dir := path.Join("./testdata", testName)
+	GoldenFileCommandTest(
+		t,
+		testutil.CalcGoldenFileTestdataDirName(), []string{
+			"diff",
+			"--compare-to",
+			path.Join(dir, "base.json"),
+			"--path",
+			dir,
+		}, nil)
+}

cmd/infracost/run.go

@@ -245,10 +245,9 @@ func (r *parallelRunner) run() ([]projectResult, error) {
 
 		if err != nil {
 			m := fmt.Sprintf("%s\n\n", err)
-			m += fmt.Sprintf("Try adding a config-file to configure how Infracost should run. See %s for details and examples.", ui.LinkString("https://infracost.io/config-file"))
+			m += fmt.Sprintf("  Try adding a config-file to configure how Infracost should run. See %s for details and examples.", ui.LinkString("https://infracost.io/config-file"))
 
-			err = clierror.NewCLIError(errors.New(m), "Could not detect path type")
-			queue = append(queue, projectJob{index: i, err: err, ctx: ctx})
+			queue = append(queue, projectJob{index: i, err: schema.NewEmptyPathTypeError(errors.New(m)), ctx: ctx})
 			continue
 		}
 

cmd/infracost/testdata/breakdown_invalid_path/breakdown_invalid_path.golden

@@ -3,7 +3,7 @@ Project: infracost/infracost/cmd/infracost/invalid
 Errors:
   No such file or directory invalid
 
-Try adding a config-file to configure how Infracost should run. See https://infracost.io/config-file for details and examples.
+  Try adding a config-file to configure how Infracost should run. See https://infracost.io/config-file for details and examples.
 
  OVERALL TOTAL       $0.00 
 ──────────────────────────────────

cmd/infracost/testdata/diff_prior_empty_project/base.json

@@ -0,0 +1,72 @@
+{
+  "version": "0.2",
+  "metadata": {
+    "infracostCommand": "breakdown",
+    "vcsBranch": "master",
+    "vcsCommitSha": "71785af96bce822bd54f359d0883cfa4ca805432",
+    "vcsCommitAuthorName": "Hugo",
+    "vcsCommitAuthorEmail": "",
+    "vcsCommitTimestamp": "2024-02-23T11:04:26Z",
+    "vcsCommitMessage": "wip",
+    "vcsRepositoryUrl": "https://github.com/infracost/infracost.git"
+  },
+  "currency": "USD",
+  "projects": [
+    {
+      "name": "infracost/infracost/cmd/infracost/testdata/diff_prior_empty_project",
+      "metadata": {
+        "path": ".",
+        "type": "error",
+        "vcsSubPath": "cmd/infracost/testdata/diff_prior_empty_project",
+        "errors": [
+          {
+            "code": 106,
+            "message": "could not detect path type for '.'\n\nTry adding a config-file to configure how Infracost should run. See \u001b[4;1mhttps://infracost.io/config-file\u001b[0m for details and examples.",
+            "data": null,
+            "isError": true
+          }
+        ]
+      },
+      "pastBreakdown": {
+        "resources": [],
+        "totalHourlyCost": "0",
+        "totalMonthlyCost": "0"
+      },
+      "breakdown": {
+        "resources": [],
+        "totalHourlyCost": "0",
+        "totalMonthlyCost": "0"
+      },
+      "diff": {
+        "resources": [],
+        "totalHourlyCost": "0",
+        "totalMonthlyCost": "0"
+      },
+      "summary": {
+        "totalDetectedResources": 0,
+        "totalSupportedResources": 0,
+        "totalUnsupportedResources": 0,
+        "totalUsageBasedResources": 0,
+        "totalNoPriceResources": 0,
+        "unsupportedResourceCounts": {},
+        "noPriceResourceCounts": {}
+      }
+    }
+  ],
+  "totalHourlyCost": "0",
+  "totalMonthlyCost": "0",
+  "pastTotalHourlyCost": "0",
+  "pastTotalMonthlyCost": "0",
+  "diffTotalHourlyCost": "0",
+  "diffTotalMonthlyCost": "0",
+  "timeGenerated": "2024-02-23T12:58:15.71255Z",
+  "summary": {
+    "totalDetectedResources": 0,
+    "totalSupportedResources": 0,
+    "totalUnsupportedResources": 0,
+    "totalUsageBasedResources": 0,
+    "totalNoPriceResources": 0,
+    "unsupportedResourceCounts": {},
+    "noPriceResourceCounts": {}
+  }
+}

cmd/infracost/testdata/diff_prior_empty_project/diff_prior_empty_project.golden

@@ -0,0 +1,40 @@
+──────────────────────────────────
+Project: infracost/infracost/cmd/infracost/testdata/diff_prior_empty_project
+
++ aws_instance.web_app
+  +$743
+
+    + Instance usage (Linux/UNIX, on-demand, m5.4xlarge)
+      +$561
+
+    + root_block_device
+
+        + Storage (general purpose SSD, gp2)
+          +$5
+
+    + ebs_block_device[0]
+
+        + Storage (provisioned IOPS SSD, io1)
+          +$125
+
+        + Provisioned IOPS
+          +$52
+
+Monthly cost change for infracost/infracost/cmd/infracost/testdata/diff_prior_empty_project
+Amount:  +$743 ($0.00 → $743)
+
+──────────────────────────────────
+Key: ~ changed, + added, - removed
+
+1 cloud resource was detected:
+∙ 1 was estimated, it includes usage-based costs, see https://infracost.io/usage-file
+
+Infracost estimate: Monthly cost will increase by $743 ↑
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
+┃ Project                                                          ┃ Cost change ┃ New monthly cost ┃
+┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━┫
+┃ infracost/infracost/cmd/infraco...tdata/diff_prior_empty_project ┃       +$743 ┃ $743             ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━━━━┛
+
+Err:
+

cmd/infracost/testdata/diff_prior_empty_project/main.tf

@@ -0,0 +1,23 @@
+provider "aws" {
+  region                      = "us-east-1" # <<<<< Try changing this to eu-west-1 to compare the costs
+  skip_credentials_validation = true
+  skip_requesting_account_id  = true
+  access_key                  = "mock_access_key"
+  secret_key                  = "mock_secret_key"
+}
+
+resource "aws_instance" "web_app" {
+  ami           = "ami-674cbc1e"
+  instance_type = "m5.4xlarge"
+
+  root_block_device {
+    volume_size = 50
+  }
+
+  ebs_block_device {
+    device_name = "my_data"
+    volume_type = "io1"
+    volume_size = 1000
+    iops        = 800
+  }
+}

internal/output/combined.go

@@ -137,7 +137,7 @@ func CompareTo(c *config.Config, current, prior Root) (Root, error) {
 				scp.Diff = schema.CalculateDiff(scp.PastResources, scp.Resources)
 			}
 
-			if !p.Metadata.HasErrors() && v.Metadata.HasErrors() {
+			if !p.Metadata.HasErrors() && !v.Metadata.IsEmptyProjectError() && v.Metadata.HasErrors() {
 				// the prior project has errors, but the current one does not
 				// The prior errors will be copied over to the current, but we
 				// also need to remove the current project costs

internal/output/diff.go

@@ -27,7 +27,7 @@ func ToDiff(out Root, opts Options) ([]byte, error) {
 
 	s += "──────────────────────────────────\n"
 	for _, project := range out.Projects {
-		if project.Metadata.HasErrors() {
+		if project.Metadata.HasErrors() && !project.Metadata.IsEmptyProjectError() {
 			erroredProjects = append(erroredProjects, project)
 			continue
 		}

internal/schema/project.go

@@ -21,6 +21,7 @@ const (
 	diagTerragruntEvaluationFailure       = 103
 	diagTerragruntModuleEvaluationFailure = 104
 	diagMissingVars                       = 105
+	diagEmptyPathType                     = 106
 
 	// Diags for git module issues
 	diagPrivateModuleDownloadFailure = 201
@@ -44,6 +45,12 @@ type ProjectDiag struct {
 	FriendlyMessage string `json:"-"`
 }
 
+// NewEmptyPathTypeError returns a project diag to indicate that a path type
+// cannot be detected.
+func NewEmptyPathTypeError(err error) *ProjectDiag {
+	return newDiag(diagEmptyPathType, err.Error(), true, nil, err)
+}
+
 // NewDiagRunQuotaExceeded returns a project diag for a run quota exceeded error.
 func NewDiagRunQuotaExceeded(err error) *ProjectDiag {
 	return &ProjectDiag{
@@ -208,6 +215,14 @@ func (m *ProjectMetadata) HasErrors() bool {
 	return len(m.Errors) > 0
 }
 
+func (m *ProjectMetadata) IsEmptyProjectError() bool {
+	if len(m.Errors) == 0 || len(m.Errors) > 1 {
+		return false
+	}
+
+	return m.Errors[0].Code == diagEmptyPathType
+}
+
 // IsRunQuotaExceeded checks if any of the project diags are of type "run quota
 // exceeded". If found it returns the associated message with this diag. This
 // should be used when in any output that notifies the user.