cmd/go: require a module root in 'go list -m' with an unversioned path

Fixes #44803

Change-Id: Ie6ee2e3bca1809c91ecedec75d2c6620da914b29
Reviewed-on: https://go-review.googlesource.com/c/go/+/298752
Trust: Bryan C. Mills <[email protected]>
Run-TryBot: Bryan C. Mills <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Jay Conrod <[email protected]>

Author: Bryan C. Mills

src/cmd/go/internal/modload/list.go

@@ -72,8 +72,13 @@ func listModules(ctx context.Context, args []string, listVersions, listRetracted
 		if search.IsRelativePath(arg) {
 			base.Fatalf("go: cannot use relative path %s to specify module", arg)
 		}
-		if !HasModRoot() && (arg == "all" || strings.Contains(arg, "...")) {
-			base.Fatalf("go: cannot match %q: %v", arg, ErrNoModRoot)
+		if !HasModRoot() {
+			if arg == "all" || strings.Contains(arg, "...") {
+				base.Fatalf("go: cannot match %q: %v", arg, ErrNoModRoot)
+			}
+			if !listVersions && !strings.Contains(arg, "@") {
+				base.Fatalf("go: cannot match %q without -versions or an explicit version: %v", arg, ErrNoModRoot)
+			}
 		}
 		if i := strings.Index(arg, "@"); i >= 0 {
 			path := arg[:i]

src/cmd/go/testdata/script/mod_outside.txt

@@ -61,6 +61,11 @@ stderr 'go: cannot match "all": go.mod file not found in current directory or an
 stderr 'go: cannot match "all": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
 ! stdout 'example.com/version'
 
+# 'go list -m <mods>' should fail if any of the mods lacks an explicit version.
+! go list -m example.com/printversion
+stderr 'go: cannot match "example.com/printversion" without -versions or an explicit version: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! stdout 'example.com/version'
+
 # 'go list -m' with wildcards should fail. Wildcards match modules in the
 # build list, so they aren't meaningful outside a module.
 ! go list -m ...

src/cmd/go/testdata/script/mod_retract_versions.txt

@@ -15,3 +15,8 @@ stdout '^example.com/retract/self/pseudo ""$'
 
 go list -m -e -f $FMT --versions example.com/retract/self/pseudo@latest
 stdout '^example.com/retract/self/pseudo: "module example.com/retract/self/pseudo: no matching versions for query \\"latest\\"" "latest"$'
+
+-- go.mod --
+module test
+
+go 1.17