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    1 Vendoring in std and cmd
    2 ========================
    4 The Go command maintains copies of external packages needed by the
    5 standard library in the src/vendor and src/cmd/vendor directories.
    7 In GOPATH mode, imports of vendored packages are resolved to these
    8 directories following normal vendor directory logic
    9 (see golang.org/s/go15vendor).
   11 In module mode, std and cmd are modules (defined in src/go.mod and
   12 src/cmd/go.mod). When a package outside std or cmd is imported
   13 by a package inside std or cmd, the import path is interpreted
   14 as if it had a "vendor/" prefix. For example, within "crypto/tls",
   15 an import of "golang.org/x/crypto/cryptobyte" resolves to
   16 "vendor/golang.org/x/crypto/cryptobyte". When a package with the
   17 same path is imported from a package outside std or cmd, it will
   18 be resolved normally. Consequently, a binary may be built with two
   19 copies of a package at different versions if the package is
   20 imported normally and vendored by the standard library.
   22 Vendored packages are internally renamed with a "vendor/" prefix
   23 to preserve the invariant that all packages have distinct paths.
   24 This is necessary to avoid compiler and linker conflicts. Adding
   25 a "vendor/" prefix also maintains the invariant that standard
   26 library packages begin with a dotless path element.
   28 The module requirements of std and cmd do not influence version
   29 selection in other modules. They are only considered when running
   30 module commands like 'go get' and 'go mod vendor' from a directory
   31 in GOROOT/src.
   33 Maintaining vendor directories
   34 ==============================
   36 Before updating vendor directories, ensure that module mode is enabled.
   37 Make sure GO111MODULE=off is not set ('on' or 'auto' should work).
   39 Requirements may be added, updated, and removed with 'go get'.
   40 The vendor directory may be updated with 'go mod vendor'.
   41 A typical sequence might be:
   43     cd src
   44     go get -d golang.org/x/net@latest
   45     go mod tidy
   46     go mod vendor
   48 Use caution when passing '-u' to 'go get'. The '-u' flag updates
   49 modules providing all transitively imported packages, not only
   50 the module providing the target package.
   52 Note that 'go mod vendor' only copies packages that are transitively
   53 imported by packages in the current module. If a new package is needed,
   54 it should be imported before running 'go mod vendor'.