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This change adds two possible upgrade paths for lazy loading: 1. Run 'go mod tidy -go=1.17'. 2. Starting in a module with no existing 'go' directive, run any 'go' command that updates the go.mod file. In the latter case, commands other than 'go mod tidy' may leave the go.mod file *very* untidy if it had non-trivial dependencies. (The 'go' invocation will promote all implicit eager dependencies to explicit lazy ones, which preserves the original module graph — most of which is not actually relevant.) 'go mod tidy -go=1.17' can be used to enable lazy loading without accidentally downgrading existing transitive dependencies. 'go mod tidy -go=1.16' can be used to disable lazy loading and clear away redundant roots in a single step (if reducing the go version), or to prune away dependencies of tests-of-external-tests (if increasing the go version). 'go mod tidy -go=1.15' can be used to add dependencies of tests-of-external-tests, although there isn't much point to that. DO NOT MERGE This change still needs an explicit test and a release note. Fixes #45094 For #36460 Change-Id: I68f057e39489dfd6a667cd11dc1e320c1ee1aec1 Reviewed-on: https://go-review.googlesource.com/c/go/+/315210 Trust: Bryan C. Mills <bcmills@google.com> Run-TryBot: Bryan C. Mills <bcmills@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Michael Matloob <matloob@golang.org> |
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Vendoring in std and cmd
========================
The Go command maintains copies of external packages needed by the
standard library in the src/vendor and src/cmd/vendor directories.
In GOPATH mode, imports of vendored packages are resolved to these
directories following normal vendor directory logic
(see golang.org/s/go15vendor).
In module mode, std and cmd are modules (defined in src/go.mod and
src/cmd/go.mod). When a package outside std or cmd is imported
by a package inside std or cmd, the import path is interpreted
as if it had a "vendor/" prefix. For example, within "crypto/tls",
an import of "golang.org/x/crypto/cryptobyte" resolves to
"vendor/golang.org/x/crypto/cryptobyte". When a package with the
same path is imported from a package outside std or cmd, it will
be resolved normally. Consequently, a binary may be built with two
copies of a package at different versions if the package is
imported normally and vendored by the standard library.
Vendored packages are internally renamed with a "vendor/" prefix
to preserve the invariant that all packages have distinct paths.
This is necessary to avoid compiler and linker conflicts. Adding
a "vendor/" prefix also maintains the invariant that standard
library packages begin with a dotless path element.
The module requirements of std and cmd do not influence version
selection in other modules. They are only considered when running
module commands like 'go get' and 'go mod vendor' from a directory
in GOROOT/src.
Maintaining vendor directories
==============================
Before updating vendor directories, ensure that module mode is enabled.
Make sure GO111MODULE=off is not set ('on' or 'auto' should work).
Requirements may be added, updated, and removed with 'go get'.
The vendor directory may be updated with 'go mod vendor'.
A typical sequence might be:
cd src
go get -d golang.org/x/net@latest
go mod tidy
go mod vendor
Use caution when passing '-u' to 'go get'. The '-u' flag updates
modules providing all transitively imported packages, not only
the module providing the target package.
Note that 'go mod vendor' only copies packages that are transitively
imported by packages in the current module. If a new package is needed,
it should be imported before running 'go mod vendor'.