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cmd/go: automatically check and use vendored packages #33848

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bcmills opened this issue Aug 26, 2019 · 57 comments
Closed

cmd/go: automatically check and use vendored packages #33848

bcmills opened this issue Aug 26, 2019 · 57 comments

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@bcmills
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bcmills commented Aug 26, 2019

Abstract

This is a proposal to enable the use of the main module's vendor directory, by default, in module mode. This proposal replaces #30240 and #29058, and subsumes #27227.

Background

The Go 1.5 release included support for a vendor subdirectory for each package subtree within GOPATH. A vendor directory, if present, implicitly changed the interpretation of import statements within that subtree to always refer to packages within the vendor directory if present.

In module mode, the meaning of each import is instead determined by the dependencies of the main module used for the build. However, from the first release of module mode (in Go 1.11), the go command has included a go mod vendor subcommand, which populates a vendor directory at the root of the main module with source code from those dependencies; and a -mod=vendor flag, which instructs the go command to use that source code for building.

In module mode, unlike GOPATH mode, the vendor subdirectories of other packages and modules are ignored — only the vendor directory at the root of the main module is used. This gives the author of the main module complete control over their dependencies via require and replace directives.

Go users have built a variety of workflows around vendored dependencies for a variety of use-cases — including self-contained builds, language-agnostic code review, and ephemeral patches — and since the launch of module mode in Go 1.11 they have made it clear that those workflows remain important in module mode.

However, vendoring in module mode today has a few rough edges:

  • A maintainer who introduces a new import statement may easily and accidentally introduce skew between the versions in the go.mod file and those in the vendor directory (cmd/go: the vendor/ folder should be kept up to date if present #29058).

    • In CL 174528, we added a simple check for this skew in the std and cmd modules in the standard library, but it relies on some assumptions about the dependencies of std and cmd that do not hold in general.
  • The maintainers of projects that use vendoring expect the vendor directory to be used by default (cmd/go: should default to use mod=vendor flag if the vendor folder exists #27227), but today in module mode that requires users to set -mod=vendor, either explicitly on the command line or in a GOFLAGS variable. For users working on multiple modules with different vendoring strategies, setting the variable may require repeated intervention over the course of the day.

This proposal attempts to address those rough edges.

Proposal

The concrete proposal is posted in a comment below. (Any updates will be linked from here.)

Latest update: #33848 (comment)

(CC @jayconrod @ianthehat)

@gopherbot gopherbot added this to the Proposal milestone Aug 26, 2019
@bcmills
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bcmills commented Aug 26, 2019

This comment contains my original proposal.

An updated version can be found below (in #33848 (comment)).

Proposal

I propose to enable -mod=vendor automatically, and to fail build operations when -mod=vendor is enabled if the vendor/ directory is out of sync with the go.mod file.

In order to detect when the vendor/ directory is out of sync with the go.mod file, we need to know the constraints imposed by the main module — that is, its require and replace directives. Given those, the remaining module requirements are computed deterministically, so we do not need to store or check the complete module graph, which may be much larger than the explicit requirements or even the final list of selected versions.

Concretely, the changes are:

  • In the vendor/modules.txt file, add an annotation indicating which modules were listed explicitly in a require or replace directive in the go.mod file as of the last invocation of go mod vendor. (This implies that every module path and version that appears in the main module's go.mod file must be listed in modules.txt, even if no packages are vendored from within that module or version.)

    • To maintain compatibility with the Go 1.11 modules.txt parser, this annotation must have the following properties:

      • Does not change the number of fields in the # <module-path> <version> lines, which must be equal to 3 in order for the existing parser to recognize the line.
      • Does not occur as a line with exactly one field (which would be interpreted as a package path within the preceding module).
      • Either does not have the prefix # , or does not occur in between the # <module-path> <version> lines and the associated <package-path> lines. (Otherwise, it would break the association between modules and packages.)
    • To comply with the above requirements, I propose that we use a line of the form:

      ## explicit
      

      or

      ## replaced by example.com/some/module vX.Y.Z
      

      or

      ## explicit; replaced by example.com/some/module vX.Y.Z
      
    • To allow for future expansion, the updated parser should check lines beginning with ## for any semicolon-delimited field matching the expected annotation, ignoring any whitespace surrounding the field. (All other tokens within such comments are reserved for future use.)

  • When a top-level vendor/modules.txt file exists and contains at least one ## annotation, then for all build commands except go get:

    • Change the default value of the -mod build flag to vendor.

    • Verify that the set of modules annotated as explicit in vendor/modules.txt is exactly equal to the set of modules (and versions) found in require directives in the main module's go.mod file.

    • Verify that the set of modules annotated as replaced by a module in vendor/modules.txt is exactly equal to the set of replace directives (including both path and version, if applicable) in the main module's go.mod file.

  • Add a new value for the -mod flag, -mod=mod, to explicitly request the non-vendor behavior: that is, to ignore the contents of the vendor directory and to automatically update the go.mod file as needed.

The proposed approach allows the following commands to work from a vendor directory with an empty module cache and no network access:

  • go list -deps ./...
  • go build ./...
  • go test ./…

Other commands may fail without an explicit -mod=mod override:

  • go list all
  • go test all
  • go list -test $(go list -deps ./…)
  • go list -m example.com/some/module

Note that the go mod subcommands do not have a -mod= flag and therefore never look at the vendor directory for information. They always require access to a module cache or module proxy. The check in this proposal ensures that the results produced by any go mod subcommand remain accurate even when the corresponding build commands use vendored sources.

Example workflow

# Upgrade the golang.org/x/sys module and fetch it from $GOPROXY.
# Also ensure that the rest of the module dependencies are consistent
# with the requirements of the upgraded module.
# This step updates the go.mod file, but not the vendor directory.
$ go get -d golang.org/x/sys

# A plain 'go test ./…' at this point may fail,
# because vendor/modules.txt may be out of sync with the go.mod file.
# However, 'go test -mod=mod ./…' should succeed,
# because it explicitly ignores the vendor directory.
$ go test -mod=mod ./...

# Download any newly-upgraded dependencies to the module cache,
# and copy them from the module cache to the vendor directory.
$ go mod vendor

# Test the packages within the module
# using the newly-updated dependencies in the vendor directory.
$ go test ./...

Caveats

Intentional modifications

The above checks do not detect intentional modifications to the vendored sources. Users who want to ensure that no intentional modifications are present will need to re-run go mod vendor and look for diffs, or (after #27348 is addressed) run go mod verify.

Local filesystem changes

The above checks also do not detect skew due to changes in local files within a directory specified in a replace directive. I do not recommend the use of filesystem replace directives in general, but the potential for skew makes them particularly important to avoid when using a vendor directory.

If we believe that changes in the local filesystem will be a significant source of skew in practice, we could expand the replaced by annotation to include a hash of the replacement directory. However, computing that hash could significantly increase the cost of the consistency check, which in the current proposal only requires us to read the go.mod and vendor/modules.txt files.

Dependency analysis

Because the approach proposed here does not retain go.mod files for modules that do not contribute packages to the build (including older-than-selected versions of packages that do contribute packages), the vendor directory will not support analysis of the module graph (go list -m all, go mod why -m, and go mod graph).

That seems like an acceptable tradeoff: adding those go.mod files would require some scheme for encoding their versions within the vendor directory, which we do not have today, and would introduce diffs that are largely irrelevant to the build during code review.

@bcmills
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bcmills commented Aug 27, 2019

One point I'm a bit uncertain on: above I proposed to trigger the automatic -mod=vendor behavior based on the presence of a ## annotation in the vendor/modules.txt file.

Would it be better to instead trigger it based on a go 1.14 directive in the go.mod file (plus the existence of vendor/modules.txt? (Why or why not?)

@thepudds
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thepudds commented Aug 27, 2019

That seems like it would be simpler to understand, including because I think it has been previously stated that the format of the modules.txt file is an internal and undocumented implementation detail?

Could you even take it a step further to have it trigger off of the presence of the vendor directory itself plus go 1.14 in the go.mod, rather than vendor/modules.txt plus go 1.14?

It would then be triggering off of things that are both more visible and actually documented, and hence would likely be easier to understand.

@ardan-bkennedy
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I propose to enable -mod=vendor automatically, and to fail build operations when -mod=vendor is enabled if the vendor/ directory is out of sync with the go.mod file.

When I build in a container, I will be copying the entire projects source tree of code into that container manually. This will cause things to be out of sync. So now, I will have to make sure that I don't copy the go.mod|sum files into the container.

This also means that anyone else on my team working with this project, will need to run throught the proxy server to validate their vendor folder is "correct". I am concerned that in the end, the vendor folder is not really acting as a vendor folder. If the module system doesn't like what it sees in vendor, the build breaks. The deps needs to be cached anyway. So might as well not even use vendor.

@bcmills
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bcmills commented Sep 18, 2019

When I build in a container, I will be copying the entire projects source tree of code into that container manually. This will cause things to be out of sync. So now, I will have to make sure that I don't copy the go.mod|sum files into the container.

I think I'm missing something. How would copying the entire source tree into the container cause the vendor directory to get out of sync with the go.mod file? Presumably you'd be copying in the same go.mod file that you used to generate the vendor directory in the first place.

@ardan-bkennedy
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How are you going to verify that the vendor folder and the go.mod file is in sync? This is going to require network calls against the proxy server I assume? I am wondering if the deps are going to be downloaded as well during this process?

@bcmills
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bcmills commented Sep 18, 2019

@ardan-bkennedy, that's all covered in the text of the proposal above (#33848 (comment)).

@ardan-bkennedy
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I read that several more times and I think it’s starting to make sense. What the above proposal is saying is, given a vendor folder with a modules.txt file, just verify that this file is in sync with the go.mod file? If they are, build against the vendor folder. If they are not, issue a build error? Therefore no calls to the proxy server are required. The original workflow is maintained?

@bcmills
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bcmills commented Sep 18, 2019

Yep. Being able to do that without hitting the network at all requires that we include some extra information in the vendor/modules.txt file compared to what we're writing today, but the amount of extra information seems reasonable to me, and the resulting file should be backward-compatible to earlier Go releases.

@ardan-bkennedy
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That's brilliant and allows vendoring to be an option again. Which is much appreciated. So the next question is, will this make a point release for 1.13 or do we need to wait for 1.14?

My concern is that projects may just give up on vendoring because of the current breakage in workflows. Which is a shame because I think vendoring has strong advantages when it's reasonable to use it.

@bcmills
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bcmills commented Sep 18, 2019

This would not be backported to 1.13. (Per the minor release policy, we only backport “security issues, serious problems with no workaround, and documentation fixes”.)

In the interim, users who rely on vendoring workflows can enable vendoring for all build commands by setting GOFLAGS=-mod=vendor, explicitly disable module mode in Go 1.13 by setting GO111MODULE=off, or implicitly disable module mode within GOPATH/src by staying on Go 1.12 until they're ready to try a 1.14 pre-release.

@rsc
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rsc commented Sep 19, 2019

It sounds like the general consensus here is that we should accept this proposal for Go 1.14.
This is probably important to do before we set GO111MODULE=on for people using the dev branch.

Am I reading this wrong? Does anyone object to accepting this proposal? Thanks.

@bcmills
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bcmills commented Sep 27, 2019

An interesting wrinkle: if a replaced module does not contribute any imported packages, we omit it from vendor/modules.txt. However, that replacement can still have an effect on the overall build list, because the replacement go.mod file may differ from the original.

This implies that we need to duplicate (and verify) all replace entries found in the go.mod file to modules.txt, even if they do not affect any module in the actual build list.

If we're not loading transitive dependencies, we don't know whether a replaced module actually exists in the build list, so we can't add an entry of the form # <module> <version>: otherwise, older versions of the go command will erroneously interpret them as being in the build list.

Fortunately, the old modules.txt parser skips module entries that have additional text after the version, so the following styles of lines should be ignored (and thus safe to use).

# example.org/unused v1.0.0 (unused)
## replaced by github.com/unused v1.0.0
# example.com/other/unused * (unused)
## replaced by ./other-unused

@bcmills
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bcmills commented Sep 27, 2019

Well that's funny. The current go mod vendor implementation already writes replacements, using the form # MODULE VERSION => MODULE [VERSION]:

fmt.Fprintf(&buf, "# %s %s%s\n", m.Path, m.Version, repl)

I think that means that go mod vendor is currently writing vendor/modules.txt files that it isn`t capable of parsing correctly.

@gopherbot
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Change https://golang.org/cl/198319 mentions this issue: cmd/go: automatically check and use vendored packages

@bcmills
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bcmills commented Oct 1, 2019

I have updated the proposal below, based on information learned during prototyping. This version supersedes the one in #33848 (comment).

Proposal

I propose to enable -mod=vendor automatically for operations that do not explicitly query or manipulate the build list, and to fail build operations when -mod=vendor is enabled if the vendor/ directory is out of sync with the go.mod file.

In order to detect when the vendor/ directory is out of sync with the go.mod file, we need to know the constraints imposed by the main module — that is, its require and replace directives. Given those, the remaining module requirements are computed deterministically, so we do not need to store or check the complete module graph, which may be much larger than the explicit requirements or even the final list of selected versions.

Concretely, the changes are:

  • In the vendor/modules.txt file, add an annotation indicating which modules were listed explicitly in a require or replace directive in the go.mod file as of the last invocation of go mod vendor. (This implies that every module path and version that appears in the main module's go.mod file must be listed in modules.txt, even if no packages are vendored from within that module or version.)

    • To maintain compatibility with the Go 1.11 modules.txt parser, this annotation must have the following properties:

      • Does not change the number of fields in the # <module-path> <version> lines [edit: for unreplaced modules only], which must be equal to 3 in order for the existing parser to recognize the line.
      • Does not occur as a line with exactly one field (which would be interpreted as a package path within the preceding module).
      • Either does not have the prefix # , or does not occur in between the # <module-path> <version> lines and the associated <package-path> lines. (Otherwise, it would break the association between modules and packages.)
    • [edit: Adopted the existing syntax generated by go mod vendor for replacements, as discovered above .]
      To comply with the above requirements, I propose that we use a line of the form:

      # example.com/some/module vA.B.C
      ## explicit
      

      to annotate explicit dependencies, and

      # example.com/some/module vA.B.C => example.com/some/other/module vX.Y.Z
      

      for replacements.

    • To allow for future expansion, the updated parser should check lines beginning with ## for any semicolon-delimited field matching the expected annotation, ignoring any whitespace surrounding the field. (All other tokens within such comments are reserved for future use.)

  • [edit: Adopted @thepudds' suggestion for trigger condition.]
    When the go.mod file specifies go 1.14 and a top-level vendor directory exists, then for all build commands except go get:

    • Change the default value of the -mod build flag to vendor.

    • Verify that the set of modules annotated as explicit in vendor/modules.txt is exactly equal to the set of modules (and versions) found in require directives in the main module's go.mod file.

    • [edit: Expanded this point to ensure that the replacements in the go.mod file account for all of the replacements reported in vendor/modules.txt.]
      Verify that the set of replacements indicated in vendor/modules.txt includes the complete set of replace directives (including both path and version, if applicable) in the main module's go.mod file, and that the replacements in the go.mod file account for all of the module replacements reported in vendor/modules.txt.

  • Add a new value for the -mod flag, -mod=mod, to explicitly request the non-vendor behavior: that is, to ignore the contents of the vendor directory and to automatically update the go.mod file as needed.

    • The go get command today treats an explicit -mod=vendor flag as an error. With this change, go get should instead always provide the behavior of -mod=mod, treating the -mod flag as unrecognized (see cmd/go: readonly does not affect all go mod sub-commands #26850 (comment)).

      In particular, go get should ignore any implicit -mod=vendor from the presence of a vendor/modules.txt file or from a -mod flag set via GOFLAGS (see also cmd/go: go get can't fetch tools with mod=vendor #32502), and treat an explicit -mod=vendor, -mod=readonly, or -mod=mod as an error (see cmd/go: explicit '-mod=readonly' argument to go get is not rejected #30345).

    • [edit: Added discussion of go list.]
      go list -m command today accepts -mod=vendor, and displays a truncated version of the build list (restricted to what was found in the vendor/modules.txt file) without further warning. Implicitly truncating the build list seems like a mistake.

      Since -mod=vendor will now be enabled implicitly, that difference will become even more subtle, especially since go mod graph will not similarly truncate the graph. I propose that go list -m should instead fail with a helpful error if -mod=vendor is set.

The proposed approach allows the following commands to work from a vendor directory with an empty module cache and no network access:

  • go list -deps ./...
  • go build ./...
  • go test ./…

Explicitly build-list related commands will continue to download missing modules to the cache:

  • go mod graph
  • go list -m example.com/some/module

Other commands may fail without an explicit -mod=mod override:

  • go list all
  • go test all
  • go list -test $(go list -deps ./…)

Note that the go mod subcommands do not have a -mod= flag and therefore never look at the vendor directory for information. They always require access to a module cache or module proxy. The check in this proposal ensures that the results produced by any go mod subcommand remain accurate even when the corresponding build commands use vendored sources.

Example workflow

# Upgrade the golang.org/x/sys module and fetch it from $GOPROXY.
# Also ensure that the rest of the module dependencies are consistent
# with the requirements of the upgraded module.
# This step updates the go.mod file, but not the vendor directory.
$ go get -d golang.org/x/sys

# A plain 'go test ./…' at this point may fail,
# because vendor/modules.txt may be out of sync with the go.mod file.
# However, 'go test -mod=mod ./…' should succeed,
# because it explicitly ignores the vendor directory.
$ go test -mod=mod ./...

# Download any newly-upgraded dependencies to the module cache,
# and copy them from the module cache to the vendor directory.
$ go mod vendor

# Test the packages within the module
# using the newly-updated dependencies in the vendor directory.
$ go test ./...

Caveats

Intentional modifications

The above checks do not detect intentional modifications to the vendored sources. Users who want to ensure that no intentional modifications are present will need to re-run go mod vendor and look for diffs, or (after #27348 is addressed) run go mod verify.

Local filesystem changes

The above checks also do not detect skew due to changes in local files within a directory specified in a replace directive. I do not recommend the use of filesystem replace directives in general, but the potential for skew makes them particularly important to avoid when using a vendor directory.

If we believe that changes in the local filesystem will be a significant source of skew in practice, we could expand the replaced by annotation to include a hash of the replacement directory. However, computing that hash could significantly increase the cost of the consistency check, which in the current proposal only requires us to read the go.mod and vendor/modules.txt files.

Dependency analysis

Because the approach proposed here does not retain go.mod files for modules that do not contribute packages to the build (including older-than-selected versions of packages that do contribute packages), the vendor directory will not support analysis of the module graph (go list -m all, go mod why -m, and go mod graph).

That seems like an acceptable tradeoff: adding those go.mod files would require some scheme for encoding their versions within the vendor directory, which we do not have today, and would introduce diffs that are largely irrelevant to the build during code review.

@gopherbot
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Change https://golang.org/cl/198318 mentions this issue: internal/goversion: update to 1.14

gopherbot pushed a commit that referenced this issue Oct 1, 2019
In #33848, we propose to use 'go 1.14' in the go.mod file to enable
new default behavior. That means that 'go mod init' needs to start
generating that directive by default, which requires the presence of
the updated version tag in the build environment.

Updates #33848

Change-Id: I9f3b8845fdfd843fd76de32f4b55d8f765d691de
Reviewed-on: https://go-review.googlesource.com/c/go/+/198318
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
@bcmills
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bcmills commented Oct 1, 2019

The (unused) annotations turn out to be very complex to implement, and for relatively little gain in usability. Probably we should leave them out.

@bcmills
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bcmills commented Oct 2, 2019

Updated #33848 (comment) and the prototype CL to omit the (unused) annotations.

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bcmills commented Oct 2, 2019

The prototype implementation (CL 198319 and CL 198438) is ready for review.

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Change https://golang.org/cl/207397 mentions this issue: cmd/go: document the -mod=mod option

gopherbot pushed a commit that referenced this issue Nov 15, 2019
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>
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Change https://golang.org/cl/210341 mentions this issue: cmd/go: include cfg.BuildModReason in 'import lookup disabled' errors

gopherbot pushed a commit that referenced this issue Dec 6, 2019
This location was missed in CL 204521.

Updates #33326
Updates #33848

Change-Id: I0ece6d9b37548d8abb54f79c69be5548a0428c76
Reviewed-on: https://go-review.googlesource.com/c/go/+/210341
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
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Change https://golang.org/cl/214081 mentions this issue: cmd/go: explicitly reject 'list -u' and 'list -versions' when '-mod=vendor' is set

gopherbot pushed a commit that referenced this issue Jan 9, 2020
…endor' is set

The information requested by these flags is not available from the
vendor directory.

Noticed while diagnosing #36478.

Updates #33848

Change-Id: I2b181ba5c27f01fdd6277d8d0ab1003c05774ff7
Reviewed-on: https://go-review.googlesource.com/c/go/+/214081
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
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Change https://golang.org/cl/222538 mentions this issue: vendor: migrate from govendor to go mod vendor

gopherbot pushed a commit to golang/arch that referenced this issue Mar 12, 2020
The rsc.io/pdf package was added to the vendor directory 5 years ago
in CL 13968, back when the vendor directory was a part of the Go 1.5
vendor experiment.

The vendor.json file was written by hand in a format compatible with
the govendor tool. By now, that tool has been deprecated in favor of
the go command in module mode.

A go.mod file requiring a newer version of rsc.io/pdf was added in
CL 167137. Modify the vendor directory to use the newer rsc.io/pdf
version by recreating vendor directory using go command in Go 1.14:

	rm -rf vendor
	go mod vendor

It's possible the vendor directory isn't needed anymore and can be
safely deleted in a future change. The scope of this CL is only to
migrate from the deprecated govendor tool to the supported go tool;
deleting the vendor directory can still be done in a future change.

Remove the explicit mention of Go 1.5 vendor experiment from README
since it's old, and not relevant by now. Add a contributing section.

Updates golang/go#30228
Updates golang/go#33848

Change-Id: I95de95a3b2d81faf7235c675e5b8d425141f8d7a
Reviewed-on: https://go-review.googlesource.com/c/arch/+/222538
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Change https://golang.org/cl/251159 mentions this issue: cmd/go/internal/modload: remove (*loader).forceStdVendor

gopherbot pushed a commit that referenced this issue Sep 9, 2020
forceStdVendor was a special-case mechanism to allow Go contributors
to use vendored dependencies by default when working in GOROOT/src.

As of Go 1.14,¹ the 'go' command uses vendored dependencies by default
within all modules, so the 'std' and 'cmd' modules no longer need to
be special cases, and we can remove this special-case code.

¹ https://golang.org/doc/go1.14#vendor

Updates #33848
Updates #30241

Change-Id: Ib2fb5841c253113b17fa86a086ce85a22ac3d121
Reviewed-on: https://go-review.googlesource.com/c/go/+/251159
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
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