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cmd/go: preserve sums for contents of modules required by go.mod #41103

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jayconrod opened this issue Aug 28, 2020 · 4 comments
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cmd/go: preserve sums for contents of modules required by go.mod #41103

jayconrod opened this issue Aug 28, 2020 · 4 comments
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FrozenDueToAge modules NeedsFix The path to resolution is known, but the work has not been done. release-blocker
Milestone
Go1.16

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@jayconrod
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What version of Go are you using (go version)?

3b6c812f3defa90bfd7dbddf24bc6135adc5a7eb

Does this issue reproduce with the latest release?

No, this is a regression in 1.16 development, probably caused by CL 237017.

What did you do?

go get any module that has no package in its root directory.

go mod init m
go get golang.org/x/tools
grep 'golang.org/x/tools [^/]* ' go.sum

go get will add a sum for the module's go.mod file to go.sum, but it won't add a sum for the module's content to go.sum.

What did you expect to see?

go get should add sums for the module's go.mod file and its content to go.sum.

What did you see instead?

go get only adds a sum for the module's go.mod file.
@jayconrod jayconrod added NeedsFix The path to resolution is known, but the work has not been done. modules labels Aug 28, 2020
@jayconrod jayconrod added this to the Go1.16 milestone Aug 28, 2020
@jayconrod jayconrod self-assigned this Aug 28, 2020
@ekalinin
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Looks like it fixed:

➜ git log -n1 | head -n5
commit ba0fab3cb731fe9a383bd61c3480cccfe32bb1f4
Author: Ian Lance Taylor <iant@golang.org>
Date:   Sat Aug 29 14:11:18 2020 -0700

    debug/elf: run relocation tests in parallel

➜ ./make.bash

➜ go version               
go version devel +ba0fab3cb7 Sun Aug 30 03:53:59 2020 +0000 linux/amd64

➜ cat cmd/go/testdata/script/mod_get_gosum_fill.txt      
go mod init m
go get rsc.io/sampler
grep 'rsc.io/sampler [^/]* ' go.mod
grep 'rsc.io/sampler [^/]* ' go.sum
cmp go.sum x.sum
-- x.sum --
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
rsc.io/sampler v1.99.99 h1:iMG9lbEG/8MdeR4lgL+Q8IcwbLNw7ijW7fTiK8Miqts=
rsc.io/sampler v1.99.99/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

➜ go test cmd/go -run=TestScript/mod_get_gosum_fill   
ok  	cmd/go	(cached)

@jayconrod
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@ekalin rsc.io/sampler has a package in its root directory, so it's not affected by this issue.

This is specifically about modules without packages in their root directories, like golang.org/x/tools.

@gopherbot
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Change https://golang.org/cl/251880 mentions this issue: cmd/go: make 'go get' preserve sums for content of new requirements

@gopherbot
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Change https://golang.org/cl/282692 mentions this issue: cmd/go: preserve sums for indirect deps fetched by 'go mod download'

gopherbot pushed a commit that referenced this issue Jan 8, 2021
cmd/go: preserve sums for indirect deps fetched by 'go mod download'
25886cf 
Previously, commands that wrote go.sum (except 'go mod tidy') would
retain sums for zip files of directly required modules. Sums of
indirect dependencies wouldn't be retained unless they were used to
load packages.

With this change, sums for indirect dependencies will be retained if
they're available. This allows users to add missing sums with
'go mod download example.com/mod', which previously only worked for
directly required modules.

Note that 'go mod download' without arguments now adds sums for every
module in the build list. That matches 1.15 behavior.

For #41103

Change-Id: I4cce2bf1c73578dae836bdb5adb32da071554f1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/282692
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
@bcmills bcmills mentioned this issue Jan 29, 2021
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@bcmills bcmills mentioned this issue Mar 2, 2021
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@golang golang locked and limited conversation to collaborators Jan 8, 2022
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