Go: Move project analysis code to separate file

2025-12-17 01:03:14 +01:00 · 2024-01-23 13:44:11 +00:00
parent 0dc3c847bc
commit ee36e7424a
2 changed files with 259 additions and 245 deletions
--- a/go/extractor/cli/go-autobuilder/go-autobuilder.go
+++ b/go/extractor/cli/go-autobuilder/go-autobuilder.go
@@ -9,13 +9,13 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
-	"sort"
 	"strings"

 	"golang.org/x/mod/semver"

 	"github.com/github/codeql-go/extractor/autobuilder"
 	"github.com/github/codeql-go/extractor/diagnostics"
+	"github.com/github/codeql-go/extractor/project"
 	"github.com/github/codeql-go/extractor/toolchain"
 	"github.com/github/codeql-go/extractor/util"
 )
@@ -142,59 +142,6 @@ func restoreRepoLayout(fromDir string, dirEntries []string, scratchDirName strin
 	}
 }

-// DependencyInstallerMode is an enum describing how dependencies should be installed
-type DependencyInstallerMode int
-
-const (
-	// GoGetNoModules represents dependency installation using `go get` without modules
-	GoGetNoModules DependencyInstallerMode = iota
-	// GoGetWithModules represents dependency installation using `go get` with modules
-	GoGetWithModules
-	// Dep represent dependency installation using `dep ensure`
-	Dep
-	// Glide represents dependency installation using `glide install`
-	Glide
-)
-
-// ModMode corresponds to the possible values of the -mod flag for the Go compiler
-type ModMode int
-
-const (
-	ModUnset ModMode = iota
-	ModReadonly
-	ModMod
-	ModVendor
-)
-
-// argsForGoVersion returns the arguments to pass to the Go compiler for the given `ModMode` and
-// Go version
-func (m ModMode) argsForGoVersion(version string) []string {
-	switch m {
-	case ModUnset:
-		return []string{}
-	case ModReadonly:
-		return []string{"-mod=readonly"}
-	case ModMod:
-		if !semver.IsValid(version) {
-			log.Fatalf("Invalid Go semver: '%s'", version)
-		}
-		if semver.Compare(version, "v1.14") < 0 {
-			return []string{} // -mod=mod is the default behaviour for go <= 1.13, and is not accepted as an argument
-		} else {
-			return []string{"-mod=mod"}
-		}
-	case ModVendor:
-		return []string{"-mod=vendor"}
-	}
-	return nil
-}
-
-type BuildInfo struct {
-	DepMode DependencyInstallerMode
-	ModMode ModMode
-	BaseDir string
-}
-
 // addVersionToMod add a go version directive, e.g. `go 1.14` to a `go.mod` file.
 func addVersionToMod(version string) bool {
 	cmd := exec.Command("go", "mod", "edit", "-go="+version)
@@ -229,169 +176,9 @@ func getSourceDir() string {
 	return srcdir
 }

-func getDirs(paths []string) []string {
-	dirs := make([]string, len(paths))
-	for i, path := range paths {
-		dirs[i] = filepath.Dir(path)
-	}
-	return dirs
-}
-
-func checkDirsNested(inputDirs []string) (string, bool) {
-	// replace "." with "" so that we can check if all the paths are nested
-	dirs := make([]string, len(inputDirs))
-	for i, inputDir := range inputDirs {
-		if inputDir == "." {
-			dirs[i] = ""
-		} else {
-			dirs[i] = inputDir
-		}
-	}
-	// the paths were generated by a depth-first search so I think they might
-	// be sorted, but we sort them just in case
-	sort.Strings(dirs)
-	for _, dir := range dirs {
-		if !strings.HasPrefix(dir, dirs[0]) {
-			return "", false
-		}
-	}
-	return dirs[0], true
-}
-
-// Returns the directory to run the go build in and whether to use a go.mod
-// file.
-func findGoModFiles(emitDiagnostics bool) (baseDir string, useGoMod bool) {
-	goModPaths := util.FindAllFilesWithName(".", "go.mod", "vendor")
-	if len(goModPaths) == 0 {
-		baseDir = "."
-		useGoMod = false
-		return
-	}
-	goModDirs := getDirs(goModPaths)
-	if util.AnyGoFilesOutsideDirs(".", goModDirs...) {
-		if emitDiagnostics {
-			diagnostics.EmitGoFilesOutsideGoModules(goModPaths)
-		}
-		baseDir = "."
-		useGoMod = false
-		return
-	}
-	if len(goModPaths) > 1 {
-		// currently not supported
-		baseDir = "."
-		commonRoot, nested := checkDirsNested(goModDirs)
-		if nested && commonRoot == "" {
-			useGoMod = true
-		} else {
-			useGoMod = false
-		}
-		if emitDiagnostics {
-			if nested {
-				diagnostics.EmitMultipleGoModFoundNested(goModPaths)
-			} else {
-				diagnostics.EmitMultipleGoModFoundNotNested(goModPaths)
-			}
-		}
-		return
-	}
-	if emitDiagnostics {
-		if goModDirs[0] == "." {
-			diagnostics.EmitSingleRootGoModFound(goModPaths[0])
-		} else {
-			diagnostics.EmitSingleNonRootGoModFound(goModPaths[0])
-		}
-	}
-	baseDir = goModDirs[0]
-	useGoMod = true
-	return
-}
-
-// Returns the appropriate DependencyInstallerMode for the current project
-func getDepMode(emitDiagnostics bool) (DependencyInstallerMode, string) {
-	bazelPaths := util.FindAllFilesWithName(".", "BUILD", "vendor")
-	bazelPaths = append(bazelPaths, util.FindAllFilesWithName(".", "BUILD.bazel", "vendor")...)
-	if len(bazelPaths) > 0 {
-		// currently not supported
-		if emitDiagnostics {
-			diagnostics.EmitBazelBuildFilesFound(bazelPaths)
-		}
-	}
-
-	goWorkPaths := util.FindAllFilesWithName(".", "go.work", "vendor")
-	if len(goWorkPaths) > 0 {
-		// currently not supported
-		if emitDiagnostics {
-			diagnostics.EmitGoWorkFound(goWorkPaths)
-		}
-	}
-
-	baseDir, useGoMod := findGoModFiles(emitDiagnostics)
-	if useGoMod {
-		log.Println("Found go.mod, enabling go modules")
-		return GoGetWithModules, baseDir
-	}
-
-	if util.FileExists("Gopkg.toml") {
-		if emitDiagnostics {
-			diagnostics.EmitGopkgTomlFound()
-		}
-		log.Println("Found Gopkg.toml, using dep instead of go get")
-		return Dep, "."
-	}
-
-	if util.FileExists("glide.yaml") {
-		if emitDiagnostics {
-			diagnostics.EmitGlideYamlFound()
-		}
-		log.Println("Found glide.yaml, using Glide instead of go get")
-		return Glide, "."
-	}
-	return GoGetNoModules, "."
-}
-
-type GoVersionInfo struct {
-	// The version string, if any
-	Version string
-	// A value indicating whether a version string was found
-	Found bool
-}
-
-// Tries to open `go.mod` and read a go directive, returning the version and whether it was found.
-func tryReadGoDirective(buildInfo BuildInfo) GoVersionInfo {
-	if buildInfo.DepMode == GoGetWithModules {
-		versionRe := regexp.MustCompile(`(?m)^go[ \t\r]+([0-9]+\.[0-9]+(\.[0-9]+)?)$`)
-		goMod, err := os.ReadFile(filepath.Join(buildInfo.BaseDir, "go.mod"))
-		if err != nil {
-			log.Println("Failed to read go.mod to check for missing Go version")
-		} else {
-			matches := versionRe.FindSubmatch(goMod)
-			if matches != nil {
-				if len(matches) > 1 {
-					return GoVersionInfo{string(matches[1]), true}
-				}
-			}
-		}
-	}
-	return GoVersionInfo{"", false}
-}
-
-// Returns the appropriate ModMode for the current project
-func getModMode(depMode DependencyInstallerMode, baseDir string) ModMode {
-	if depMode == GoGetWithModules {
-		// if a vendor/modules.txt file exists, we assume that there are vendored Go dependencies, and
-		// skip the dependency installation step and run the extractor with `-mod=vendor`
-		if util.FileExists(filepath.Join(baseDir, "vendor", "modules.txt")) {
-			return ModVendor
-		} else if util.DirExists(filepath.Join(baseDir, "vendor")) {
-			return ModMod
-		}
-	}
-	return ModUnset
-}
-
 // fixGoVendorIssues fixes issues with go vendor for go version >= 1.14
-func fixGoVendorIssues(buildInfo *BuildInfo, goModVersionFound bool) {
-	if buildInfo.ModMode == ModVendor {
+func fixGoVendorIssues(buildInfo *project.BuildInfo, goModVersionFound bool) {
+	if buildInfo.ModMode == project.ModVendor {
 		// fix go vendor issues with go versions >= 1.14 when no go version is specified in the go.mod
 		// if this is the case, and dependencies were vendored with an old go version (and therefore
 		// do not contain a '## explicit' annotation, the go command will fail and refuse to do any
@@ -399,7 +186,7 @@ func fixGoVendorIssues(buildInfo *BuildInfo, goModVersionFound bool) {
 		//
 		// we work around this by adding an explicit go version of 1.13, which is the last version
 		// where this is not an issue
-		if buildInfo.DepMode == GoGetWithModules {
+		if buildInfo.DepMode == project.GoGetWithModules {
 			if !goModVersionFound {
 				// if the go.mod does not contain a version line
 				modulesTxt, err := os.ReadFile("vendor/modules.txt")
@@ -410,7 +197,7 @@ func fixGoVendorIssues(buildInfo *BuildInfo, goModVersionFound bool) {
 					log.Println("Adding a version directive to the go.mod file as the modules.txt does not have explicit annotations")
 					if !addVersionToMod("1.13") {
 						log.Println("Failed to add a version to the go.mod file to fix explicitly required package bug; not using vendored dependencies")
-						buildInfo.ModMode = ModMod
+						buildInfo.ModMode = project.ModMod
 					}
 				}
 			}
@@ -419,9 +206,9 @@ func fixGoVendorIssues(buildInfo *BuildInfo, goModVersionFound bool) {
 }

 // Determines whether the project needs a GOPATH set up
-func getNeedGopath(buildInfo BuildInfo, importpath string) bool {
+func getNeedGopath(buildInfo project.BuildInfo, importpath string) bool {
 	needGopath := true
-	if buildInfo.DepMode == GoGetWithModules {
+	if buildInfo.DepMode == project.GoGetWithModules {
 		needGopath = false
 	}
 	// if `LGTM_INDEX_NEED_GOPATH` is set, it overrides the value for `needGopath` inferred above
@@ -442,9 +229,9 @@ func getNeedGopath(buildInfo BuildInfo, importpath string) bool {
 }

 // Try to update `go.mod` and `go.sum` if the go version is >= 1.16.
-func tryUpdateGoModAndGoSum(buildInfo BuildInfo) {
+func tryUpdateGoModAndGoSum(buildInfo project.BuildInfo) {
 	// Go 1.16 and later won't automatically attempt to update go.mod / go.sum during package loading, so try to update them here:
-	if buildInfo.ModMode != ModVendor && buildInfo.DepMode == GoGetWithModules && semver.Compare(getEnvGoSemVer(), "v1.16") >= 0 {
+	if buildInfo.ModMode != project.ModVendor && buildInfo.DepMode == project.GoGetWithModules && semver.Compare(getEnvGoSemVer(), "v1.16") >= 0 {
 		// stat go.mod and go.sum
 		goModPath := filepath.Join(buildInfo.BaseDir, "go.mod")
 		beforeGoModFileInfo, beforeGoModErr := os.Stat(goModPath)
@@ -608,7 +395,7 @@ func setGopath(root string) {

 // Try to build the project without custom commands. If that fails, return a boolean indicating
 // that we should install dependencies ourselves.
-func buildWithoutCustomCommands(modMode ModMode) bool {
+func buildWithoutCustomCommands(modMode project.ModMode) bool {
 	shouldInstallDependencies := false
 	// try to build the project
 	buildSucceeded := autobuilder.Autobuild()
@@ -619,7 +406,7 @@ func buildWithoutCustomCommands(modMode ModMode) bool {
 		log.Println("Build failed, continuing to install dependencies.")

 		shouldInstallDependencies = true
-	} else if util.DepErrors("./...", modMode.argsForGoVersion(getEnvGoSemVer())...) {
+	} else if util.DepErrors("./...", modMode.ArgsForGoVersion(getEnvGoSemVer())...) {
 		log.Println("Dependencies are still not resolving after the build, continuing to install dependencies.")

 		shouldInstallDependencies = true
@@ -662,10 +449,10 @@ func buildWithCustomCommands(inst string) {
 }

 // Install dependencies using the given dependency installer mode.
-func installDependencies(buildInfo BuildInfo) {
+func installDependencies(buildInfo project.BuildInfo) {
 	// automatically determine command to install dependencies
 	var install *exec.Cmd
-	if buildInfo.DepMode == Dep {
+	if buildInfo.DepMode == project.Dep {
 		// set up the dep cache if SEMMLE_CACHE is set
 		cacheDir := os.Getenv("SEMMLE_CACHE")
 		if cacheDir != "" {
@@ -695,14 +482,14 @@ func installDependencies(buildInfo BuildInfo) {
 			install = exec.Command("dep", "ensure", "-v")
 		}
 		log.Println("Installing dependencies using `dep ensure`.")
-	} else if buildInfo.DepMode == Glide {
+	} else if buildInfo.DepMode == project.Glide {
 		install = exec.Command("glide", "install")
 		log.Println("Installing dependencies using `glide install`")
 	} else {
 		// explicitly set go module support
-		if buildInfo.DepMode == GoGetWithModules {
+		if buildInfo.DepMode == project.GoGetWithModules {
 			os.Setenv("GO111MODULE", "on")
-		} else if buildInfo.DepMode == GoGetNoModules {
+		} else if buildInfo.DepMode == project.GoGetNoModules {
 			os.Setenv("GO111MODULE", "off")
 		}

@@ -715,15 +502,15 @@ func installDependencies(buildInfo BuildInfo) {
 }

 // Run the extractor.
-func extract(buildInfo BuildInfo) {
+func extract(buildInfo project.BuildInfo) {
 	extractor, err := util.GetExtractorPath()
 	if err != nil {
 		log.Fatalf("Could not determine path of extractor: %v.\n", err)
 	}

 	extractorArgs := []string{}
-	if buildInfo.DepMode == GoGetWithModules {
-		extractorArgs = append(extractorArgs, buildInfo.ModMode.argsForGoVersion(getEnvGoSemVer())...)
+	if buildInfo.DepMode == project.GoGetWithModules {
+		extractorArgs = append(extractorArgs, buildInfo.ModMode.ArgsForGoVersion(getEnvGoSemVer())...)
 	}
 	extractorArgs = append(extractorArgs, "./...")

@@ -738,12 +525,6 @@ func extract(buildInfo BuildInfo) {
 	}
 }

-func getBuildInfo(emitDiagnostics bool) BuildInfo {
-	depMode, baseDir := getDepMode(true)
-	modMode := getModMode(depMode, baseDir)
-	return BuildInfo{depMode, modMode, baseDir}
-}
-
 // Build the project and run the extractor.
 func installDependenciesAndBuild() {
 	log.Printf("Autobuilder was built with %s, environment has %s\n", runtime.Version(), toolchain.GetEnvGoVersion())
@@ -755,12 +536,12 @@ func installDependenciesAndBuild() {

 	// determine how to install dependencies and whether a GOPATH needs to be set up before
 	// extraction
-	buildInfo := getBuildInfo(true)
+	buildInfo := project.GetBuildInfo(true)
 	if _, present := os.LookupEnv("GO111MODULE"); !present {
 		os.Setenv("GO111MODULE", "auto")
 	}

-	goVersionInfo := tryReadGoDirective(buildInfo)
+	goVersionInfo := project.TryReadGoDirective(buildInfo)

 	// This diagnostic is not required if the system Go version is 1.21 or greater, since the
 	// Go tooling should install required Go versions as needed.
@@ -802,18 +583,18 @@ func installDependenciesAndBuild() {
 		buildWithCustomCommands(inst)
 	}

-	if buildInfo.ModMode == ModVendor {
+	if buildInfo.ModMode == project.ModVendor {
 		// test if running `go` with -mod=vendor works, and if it doesn't, try to fallback to -mod=mod
 		// or not set if the go version < 1.14. Note we check this post-build in case the build brings
 		// the vendor directory up to date.
 		if !checkVendor() {
-			buildInfo.ModMode = ModMod
+			buildInfo.ModMode = project.ModMod
 			log.Println("The vendor directory is not consistent with the go.mod; not using vendored dependencies.")
 		}
 	}

 	if shouldInstallDependencies {
-		if buildInfo.ModMode == ModVendor {
+		if buildInfo.ModMode == project.ModVendor {
 			log.Printf("Skipping dependency installation because a Go vendor directory was found.")
 		} else {
 			installDependencies(buildInfo)
@@ -1079,8 +860,8 @@ func (v versionInfo) String() string {
 // Get the version of Go to install and output it to stdout as json.
 func identifyEnvironment() {
 	var v versionInfo
-	buildInfo := getBuildInfo(false)
-	goVersionInfo := tryReadGoDirective(buildInfo)
+	buildInfo := project.GetBuildInfo(false)
+	goVersionInfo := project.TryReadGoDirective(buildInfo)
 	v.goModVersion, v.goModVersionFound = goVersionInfo.Version, goVersionInfo.Found

 	v.goEnvVersionFound = toolchain.IsInstalled()
--- a/go/extractor/project/project.go
+++ b/go/extractor/project/project.go
@@ -0,0 +1,233 @@
+package project
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+
+	"github.com/github/codeql-go/extractor/diagnostics"
+	"github.com/github/codeql-go/extractor/util"
+	"golang.org/x/mod/semver"
+)
+
+func getDirs(paths []string) []string {
+	dirs := make([]string, len(paths))
+	for i, path := range paths {
+		dirs[i] = filepath.Dir(path)
+	}
+	return dirs
+}
+
+func checkDirsNested(inputDirs []string) (string, bool) {
+	// replace "." with "" so that we can check if all the paths are nested
+	dirs := make([]string, len(inputDirs))
+	for i, inputDir := range inputDirs {
+		if inputDir == "." {
+			dirs[i] = ""
+		} else {
+			dirs[i] = inputDir
+		}
+	}
+	// the paths were generated by a depth-first search so I think they might
+	// be sorted, but we sort them just in case
+	sort.Strings(dirs)
+	for _, dir := range dirs {
+		if !strings.HasPrefix(dir, dirs[0]) {
+			return "", false
+		}
+	}
+	return dirs[0], true
+}
+
+// Returns the directory to run the go build in and whether to use a go.mod
+// file.
+func findGoModFiles(emitDiagnostics bool) (baseDir string, useGoMod bool) {
+	goModPaths := util.FindAllFilesWithName(".", "go.mod", "vendor")
+	if len(goModPaths) == 0 {
+		baseDir = "."
+		useGoMod = false
+		return
+	}
+	goModDirs := getDirs(goModPaths)
+	if util.AnyGoFilesOutsideDirs(".", goModDirs...) {
+		if emitDiagnostics {
+			diagnostics.EmitGoFilesOutsideGoModules(goModPaths)
+		}
+		baseDir = "."
+		useGoMod = false
+		return
+	}
+	if len(goModPaths) > 1 {
+		// currently not supported
+		baseDir = "."
+		commonRoot, nested := checkDirsNested(goModDirs)
+		if nested && commonRoot == "" {
+			useGoMod = true
+		} else {
+			useGoMod = false
+		}
+		if emitDiagnostics {
+			if nested {
+				diagnostics.EmitMultipleGoModFoundNested(goModPaths)
+			} else {
+				diagnostics.EmitMultipleGoModFoundNotNested(goModPaths)
+			}
+		}
+		return
+	}
+	if emitDiagnostics {
+		if goModDirs[0] == "." {
+			diagnostics.EmitSingleRootGoModFound(goModPaths[0])
+		} else {
+			diagnostics.EmitSingleNonRootGoModFound(goModPaths[0])
+		}
+	}
+	baseDir = goModDirs[0]
+	useGoMod = true
+	return
+}
+
+// DependencyInstallerMode is an enum describing how dependencies should be installed
+type DependencyInstallerMode int
+
+const (
+	// GoGetNoModules represents dependency installation using `go get` without modules
+	GoGetNoModules DependencyInstallerMode = iota
+	// GoGetWithModules represents dependency installation using `go get` with modules
+	GoGetWithModules
+	// Dep represent dependency installation using `dep ensure`
+	Dep
+	// Glide represents dependency installation using `glide install`
+	Glide
+)
+
+// Returns the appropriate DependencyInstallerMode for the current project
+func getDepMode(emitDiagnostics bool) (DependencyInstallerMode, string) {
+	bazelPaths := util.FindAllFilesWithName(".", "BUILD", "vendor")
+	bazelPaths = append(bazelPaths, util.FindAllFilesWithName(".", "BUILD.bazel", "vendor")...)
+	if len(bazelPaths) > 0 {
+		// currently not supported
+		if emitDiagnostics {
+			diagnostics.EmitBazelBuildFilesFound(bazelPaths)
+		}
+	}
+
+	goWorkPaths := util.FindAllFilesWithName(".", "go.work", "vendor")
+	if len(goWorkPaths) > 0 {
+		// currently not supported
+		if emitDiagnostics {
+			diagnostics.EmitGoWorkFound(goWorkPaths)
+		}
+	}
+
+	baseDir, useGoMod := findGoModFiles(emitDiagnostics)
+	if useGoMod {
+		log.Println("Found go.mod, enabling go modules")
+		return GoGetWithModules, baseDir
+	}
+
+	if util.FileExists("Gopkg.toml") {
+		if emitDiagnostics {
+			diagnostics.EmitGopkgTomlFound()
+		}
+		log.Println("Found Gopkg.toml, using dep instead of go get")
+		return Dep, "."
+	}
+
+	if util.FileExists("glide.yaml") {
+		if emitDiagnostics {
+			diagnostics.EmitGlideYamlFound()
+		}
+		log.Println("Found glide.yaml, using Glide instead of go get")
+		return Glide, "."
+	}
+	return GoGetNoModules, "."
+}
+
+// ModMode corresponds to the possible values of the -mod flag for the Go compiler
+type ModMode int
+
+const (
+	ModUnset ModMode = iota
+	ModReadonly
+	ModMod
+	ModVendor
+)
+
+// argsForGoVersion returns the arguments to pass to the Go compiler for the given `ModMode` and
+// Go version
+func (m ModMode) ArgsForGoVersion(version string) []string {
+	switch m {
+	case ModUnset:
+		return []string{}
+	case ModReadonly:
+		return []string{"-mod=readonly"}
+	case ModMod:
+		if !semver.IsValid(version) {
+			log.Fatalf("Invalid Go semver: '%s'", version)
+		}
+		if semver.Compare(version, "v1.14") < 0 {
+			return []string{} // -mod=mod is the default behaviour for go <= 1.13, and is not accepted as an argument
+		} else {
+			return []string{"-mod=mod"}
+		}
+	case ModVendor:
+		return []string{"-mod=vendor"}
+	}
+	return nil
+}
+
+// Returns the appropriate ModMode for the current project
+func getModMode(depMode DependencyInstallerMode, baseDir string) ModMode {
+	if depMode == GoGetWithModules {
+		// if a vendor/modules.txt file exists, we assume that there are vendored Go dependencies, and
+		// skip the dependency installation step and run the extractor with `-mod=vendor`
+		if util.FileExists(filepath.Join(baseDir, "vendor", "modules.txt")) {
+			return ModVendor
+		} else if util.DirExists(filepath.Join(baseDir, "vendor")) {
+			return ModMod
+		}
+	}
+	return ModUnset
+}
+
+type BuildInfo struct {
+	DepMode DependencyInstallerMode
+	ModMode ModMode
+	BaseDir string
+}
+
+func GetBuildInfo(emitDiagnostics bool) BuildInfo {
+	depMode, baseDir := getDepMode(true)
+	modMode := getModMode(depMode, baseDir)
+	return BuildInfo{depMode, modMode, baseDir}
+}
+
+type GoVersionInfo struct {
+	// The version string, if any
+	Version string
+	// A value indicating whether a version string was found
+	Found bool
+}
+
+// Tries to open `go.mod` and read a go directive, returning the version and whether it was found.
+func TryReadGoDirective(buildInfo BuildInfo) GoVersionInfo {
+	if buildInfo.DepMode == GoGetWithModules {
+		versionRe := regexp.MustCompile(`(?m)^go[ \t\r]+([0-9]+\.[0-9]+(\.[0-9]+)?)$`)
+		goMod, err := os.ReadFile(filepath.Join(buildInfo.BaseDir, "go.mod"))
+		if err != nil {
+			log.Println("Failed to read go.mod to check for missing Go version")
+		} else {
+			matches := versionRe.FindSubmatch(goMod)
+			if matches != nil {
+				if len(matches) > 1 {
+					return GoVersionInfo{string(matches[1]), true}
+				}
+			}
+		}
+	}
+	return GoVersionInfo{"", false}
+}