cmd/go: document the -mod=mod option
Updates #33848
Change-Id: I505490906be7cd6fbcdc6a05c1017c779dbf7bba
Reviewed-on: https://go-review.googlesource.com/c/go/+/207397
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
index 0be368d..add11a4 100644
--- a/src/cmd/go/alldocs.go
+++ b/src/cmd/go/alldocs.go
@@ -148,7 +148,7 @@
// build code that will be linked against shared libraries previously
// created with -buildmode=shared.
// -mod mode
-// module download mode to use: readonly or vendor.
+// module download mode to use: readonly, vendor, or mod.
// See 'go help modules' for more.
// -modcacherw
// leave newly-created directories in the module cache read-write
@@ -2495,6 +2495,9 @@
// directory holds the correct copies of dependencies and ignores
// the dependency descriptions in go.mod.
//
+// If invoked with -mod=mod, the go command loads modules from the module cache
+// even if there is a vendor directory present.
+//
// Pseudo-versions
//
// The go.mod file and the go command more generally use semantic versions as
diff --git a/src/cmd/go/internal/modload/help.go b/src/cmd/go/internal/modload/help.go
index 1927c1c..b47f3de 100644
--- a/src/cmd/go/internal/modload/help.go
+++ b/src/cmd/go/internal/modload/help.go
@@ -179,6 +179,9 @@
directory holds the correct copies of dependencies and ignores
the dependency descriptions in go.mod.
+If invoked with -mod=mod, the go command loads modules from the module cache
+even if there is a vendor directory present.
+
Pseudo-versions
The go.mod file and the go command more generally use semantic versions as
diff --git a/src/cmd/go/internal/work/build.go b/src/cmd/go/internal/work/build.go
index 45dd165..e3b25c9 100644
--- a/src/cmd/go/internal/work/build.go
+++ b/src/cmd/go/internal/work/build.go
@@ -100,7 +100,7 @@
build code that will be linked against shared libraries previously
created with -buildmode=shared.
-mod mode
- module download mode to use: readonly or vendor.
+ module download mode to use: readonly, vendor, or mod.
See 'go help modules' for more.
-modcacherw
leave newly-created directories in the module cache read-write
