Fix/buildgraph

.github/workflows/buildgraph.yml

@@ -37,6 +37,9 @@ jobs:
       - name: Run BuildGraph
         id: buildgraph
         uses: ./action
+        with:
+          working-directory: testproject
+          go-version-file: testproject/go.mod
 
   # ── 2. Build affected services ───────────────────────────────────────────────
   build:
@@ -55,12 +58,14 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
+          go-version-file: testproject/go.mod
           cache: true
 
       # ── Customize this step to match your project layout ──
       - name: Build ${{ matrix.service }}
+        working-directory: testproject
         run: go build -v -o bin/${{ matrix.service }} ./services/${{ matrix.service }}/...
 
       - name: Test ${{ matrix.service }}
+        working-directory: testproject
         run: go test -v ./services/${{ matrix.service }}/...

cli/root.go

@@ -3,6 +3,7 @@
 package cli
 
 import (
+	"errors"
 	"log"
 	"os"
 	"strings"
@@ -64,7 +65,12 @@ func initConfig() {
 	viper.SetDefault("exclude.patterns", defaults.Exclude.Patterns)
 
 	if err := viper.ReadInConfig(); err != nil {
-		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
+		// When SetConfigFile is used, viper returns a plain *fs.PathError for
+		// a missing file — not viper.ConfigFileNotFoundError (which is only
+		// returned when searching via SetConfigName/AddConfigPath). Use
+		// errors.Is(err, os.ErrNotExist) to correctly catch the missing-file
+		// case and only fatal on genuine read errors (bad permissions, etc.).
+		if !errors.Is(err, os.ErrNotExist) {
 			log.Fatalf("error reading config file %s: %v", cfgFile, err)
 		}
 	}

testproject/.buildgraph/baseline.json

@@ -1,7 +1,7 @@
 {
   "version": "1.0",
-  "generated_at": "2026-03-07T16:37:56.954428+01:00",
-  "commit": "7f06877b7034f2f5d047264c051f10a1ba2c608f",
+  "generated_at": "2026-03-08T04:17:49.934595+01:00",
+  "commit": "eb20a183665091ed92e356c6b034bafcd11b04c8",
   "go_version": "go1.24.2",
   "module_path": "github.com/bubunyo/buildgraph/testproject",
   "graph": {
@@ -11,8 +11,8 @@
         "full_name": "github.com/bubunyo/buildgraph/testproject/core/module-a.Fetch",
         "package": "github.com/bubunyo/buildgraph/testproject/core/module-a",
         "file": "core/module-a/foo.go",
-        "start_line": 10,
-        "end_line": 10,
+        "start_line": 12,
+        "end_line": 12,
         "is_exported": true,
         "is_main": false,
         "ast_hash": "",
@@ -41,6 +41,17 @@
             "type": "internal",
             "name": "Transform",
             "full_name": "github.com/bubunyo/buildgraph/testproject/core/module-a.Transform"
+          },
+          {
+            "package": {
+              "path": "fmt",
+              "name": "fmt",
+              "version": "",
+              "module": "fmt"
+            },
+            "type": "external",
+            "name": "Println",
+            "full_name": "fmt.Println"
           }
         ]
       },
@@ -49,8 +60,8 @@
         "full_name": "github.com/bubunyo/buildgraph/testproject/core/module-a.Transform",
         "package": "github.com/bubunyo/buildgraph/testproject/core/module-a",
         "file": "core/module-a/foo.go",
-        "start_line": 14,
-        "end_line": 14,
+        "start_line": 17,
+        "end_line": 17,
         "is_exported": true,
         "is_main": false,
         "ast_hash": "",
@@ -74,8 +85,8 @@
         "full_name": "github.com/bubunyo/buildgraph/testproject/core/module-b.Delete",
         "package": "github.com/bubunyo/buildgraph/testproject/core/module-b",
         "file": "core/module-b/bar.go",
-        "start_line": 10,
-        "end_line": 10,
+        "start_line": 11,
+        "end_line": 11,
         "is_exported": true,
         "is_main": false,
         "ast_hash": "",
@@ -222,8 +233,8 @@
         "github.com/bubunyo/buildgraph/testproject/services/service-a.main"
       ],
       "github.com/bubunyo/buildgraph/testproject/core/module-a.Transform": [
-        "github.com/bubunyo/buildgraph/testproject/services/service-b.main",
-        "github.com/bubunyo/buildgraph/testproject/core/module-a.Process"
+        "github.com/bubunyo/buildgraph/testproject/core/module-a.Process",
+        "github.com/bubunyo/buildgraph/testproject/services/service-b.main"
       ],
       "github.com/bubunyo/buildgraph/testproject/core/module-b.Save": [
         "github.com/bubunyo/buildgraph/testproject/services/service-a.main"
@@ -241,28 +252,30 @@
   },
   "function_hashes": {
     "github.com/bubunyo/buildgraph/testproject/core/module-a.Fetch": {
-      "ast_hash": "sha256:5327810cfd8a408b88efe27f692bf8e9bf2dfa04b305eeb318f69d30dceff7e3",
-      "transitive_hash": "sha256:bb4d99c46014d97034fb67690a66d43290fa35904e3613f4665d3bd61876373e",
+      "ast_hash": "sha256:3021ccf5567e3c72f785030c2051fcf0b781826084b2d7682040fa1306677a22",
+      "transitive_hash": "sha256:d20792fcba5f1ab337e8084c060562e81531e21f93a4d2a70b98daa973f49669",
       "deps_hash": "",
       "external_deps": null
     },
     "github.com/bubunyo/buildgraph/testproject/core/module-a.Process": {
-      "ast_hash": "sha256:d875a15f77128861bcaf64e487f4c1313363f8a3746f6f20fa05b285fe9758fc",
-      "transitive_hash": "sha256:c4a9866cb819111932045fbcca32e5e16dd256d02df6e09915a5bf5a57c7efcc",
+      "ast_hash": "sha256:7e3acc042a595f937d69d71d830bead9b5a8fecf80eb712fd560862b144013a9",
+      "transitive_hash": "sha256:cb63b3f89736f46e972dad5d870c9d436d1856307f54486458116de770ad02e2",
       "deps_hash": "",
-      "external_deps": null
+      "external_deps": [
+        "fmt"
+      ]
     },
     "github.com/bubunyo/buildgraph/testproject/core/module-a.Transform": {
-      "ast_hash": "sha256:9eb1c193ecb1cd9466b59b73e568bfbe94a329dddc40618d0c4252771900436e",
-      "transitive_hash": "sha256:9d796685935eb3e31f60e7fc5329cccac208714a92b8127c1d0d85e2fbf3ace0",
+      "ast_hash": "sha256:2479b9059a0497952bb56c013f24aa0514ee9f685be16b6920252d29c64215a3",
+      "transitive_hash": "sha256:62b22b56e613ee61695a05c6a8cfd481f400653e9e5c7b805d7719f8ae031b76",
       "deps_hash": "",
       "external_deps": [
         "fmt"
       ]
     },
     "github.com/bubunyo/buildgraph/testproject/core/module-b.Delete": {
-      "ast_hash": "sha256:2f493b90b3b1eccda25859e3e3b25c2042bba69fbf6c258a96d844262078851d",
-      "transitive_hash": "sha256:2e0f94d48b710de5db0de8cecb9cac3ac002ba88428d70d8848534eac7c0272c",
+      "ast_hash": "sha256:32a122d9d36f00b8d0b164a36ef8240f67cd698e6bbc6783b351128483c9c389",
+      "transitive_hash": "sha256:4b3161289620ba7dfc7fd712a9873d62d9f7e1f11a3fa91f53f8eb2d5e855cdd",
       "deps_hash": "",
       "external_deps": [
         "fmt"
@@ -278,15 +291,15 @@
     },
     "github.com/bubunyo/buildgraph/testproject/services/service-a.main": {
       "ast_hash": "sha256:1a597aedbc5452adebf65614dd3e540a46c94ca959fad3d20a8702ec4b6ad934",
-      "transitive_hash": "sha256:f845f9cde7af38e09553571c2f1284da87b9123005fb9c51d1b6c45c4397281c",
+      "transitive_hash": "sha256:c0777cdd121ac0357fdfd9dd1bb37c67dcc06942e9bc2e575a45885e870f79f9",
       "deps_hash": "",
       "external_deps": [
         "fmt"
       ]
     },
     "github.com/bubunyo/buildgraph/testproject/services/service-b.main": {
       "ast_hash": "sha256:9cee7f741285afcc51ac1c37c1e34fd3880420f417a3d374091911e1187b2a13",
-      "transitive_hash": "sha256:12bad9e597d8dd6c250994783344a2510e6125b958031625b7778beb2b2834bd",
+      "transitive_hash": "sha256:091b00e1706de1df7463c31567025ba5f3f831224961a8f512802adcdedc46d2",
       "deps_hash": "",
       "external_deps": [
         "fmt"

testproject/README.md

@@ -0,0 +1,40 @@
+# testproject
+
+A minimal Go monorepo used as a fixture for `pkg/analyzer` integration tests
+and as the target project for the BuildGraph CI workflow.
+
+## Structure
+
+```
+testproject/
+├── buildgraph.yaml        # BuildGraph config — scans services/
+├── go.mod                 # module: github.com/bubunyo/buildgraph/testproject
+├── core/
+│   ├── module-a/          # Shared library used by both services
+│   │   └── foo.go         # Process(), Fetch(), Transform()
+│   └── module-b/          # Shared library used only by service-a
+│       └── bar.go         # Save(), Delete()
+└── services/
+    ├── service-a/         # Depends on module-a and module-b
+    │   └── main.go        # Calls module_a.Process → module_b.Save
+    └── service-b/         # Depends on module-a only
+        └── main.go        # Calls module_a.Fetch, module_a.Transform
+```
+
+## Dependency graph
+
+```
+service-a → module-a (Process, via Transform)
+service-a → module-b (Save)
+service-b → module-a (Fetch, Transform)
+```
+
+Because `module-a` is shared, a change there will cause **both** services to
+be flagged for rebuild. A change to `module-b` only affects `service-a`.
+`service-b` is isolated from `module-b` entirely.
+
+## What tests it
+
+The `pkg/analyzer` integration tests load this project via `go/packages` to
+exercise the full analysis pipeline — call graph construction, hash
+computation, and source hash caching — against real Go source.

testproject/core/module-a/foo.go

@@ -4,6 +4,7 @@ import "fmt"
 
 func Process(input string) string {
 	result := Transform(input)
+	fmt.Println("Syntetic change 3")
 	return result
 }