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internal/report: make openSourceFile cognizant of Go modules #612

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internal/report: make openSourceFile cognizant of Go modules #612

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14 changes: 13 additions & 1 deletion internal/report/source.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ import (
"os"
"path/filepath"
"regexp"
"runtime"
"sort"
"strconv"
"strings"
Expand Down Expand Up @@ -917,8 +918,19 @@ func openSourceFile(path, searchPath, trim string) (*os.File, error) {
f, err := os.Open(path)
return f, err
}
possibleBases := filepath.SplitList(searchPath)
if gopath := os.Getenv("GOPATH"); gopath != "" {
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An alternative would be to somehow make sure that the SourcePath field in options is set correctly earlier?

And if it is the case that all/most Go users are using "go tool pprof" then perhaps we can just arrange for the Go invocation code to pass the right source path settings? Or are you worried about "pprof" invocations that are not via "go tool pprof"?

// We can also look through:
// * $GOPATH/pkg/mod
// * runtime.GOROOT()/src
// in case the file originates from Go modules.
// See https://github.com/google/pprof/issues/611.
possibleBases = append(possibleBases,
filepath.Join(gopath, "pkg", "mod"),
filepath.Join(runtime.GOROOT(), "src"))
}
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Perhaps nitpicking slightly, but this is not entirely correct; the only way to reliably find these out would be to run go env -json GOMODCACHE GOROOT.

Using just os.Getenv("GOPATH") will not see if the user set up their own GOMODCACHE, nor will it work with env vars set with go env -w.

// Scan each component of the path.
for _, dir := range filepath.SplitList(searchPath) {
for _, dir := range possibleBases {
// Search up for every parent of each possible path.
for {
filename := filepath.Join(dir, path)
Expand Down