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cmd/go/internal/modload: only check root-promotion during tidy for lazy modules

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In a lazy module, it is important that tidyRoots does not add any new
roots because the dependencies of non-roots are pruned out.

In an eager module, that property is not important (and does not hold
in general) because no dependencies are ever pruned out.

Fixes #45952

Change-Id: I5c95b5696b7112b9219e38af04e0dece7fb6e202
Reviewed-on: https://go-review.googlesource.com/c/go/+/316754
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Bryan C. Mills 2021-05-04 16:41:13 -04:00
parent 6a6aa32783
commit 62a87f64b9
2 changed files with 29 additions and 9 deletions
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18
src/cmd/go/internal/modload/load.go
View File

@ -1065,13 +1065,17 @@ func loadFromRoots(ctx context.Context, params loaderParams) *loader {
ld.errorf("go: %v\n", err)
}
// We continuously add tidy roots to ld.requirements during loading, so at
// this point the tidy roots should be a subset of the roots of
// ld.requirements. If not, there is a bug in the loading loop above.
for _, m := range rs.rootModules {
if v, ok := ld.requirements.rootSelected(m.Path); !ok || v != m.Version {
ld.errorf("go: internal error: a requirement on %v is needed but was not added during package loading\n", m)
base.ExitIfErrors()
if ld.requirements.depth == lazy {
// We continuously add tidy roots to ld.requirements during loading, so at
// this point the tidy roots should be a subset of the roots of
// ld.requirements, ensuring that no new dependencies are brought inside
// the lazy-loading horizon.
// If that is not the case, there is a bug in the loading loop above.
for _, m := range rs.rootModules {
if v, ok := ld.requirements.rootSelected(m.Path); !ok || v != m.Version {
ld.errorf("go: internal error: a requirement on %v is needed but was not added during package loading\n", m)
base.ExitIfErrors()
}
}
}
ld.requirements = rs

20
src/cmd/go/testdata/script/mod_tidy_newroot.txt vendored
View File

@ -12,8 +12,8 @@
# dependency (or else no new root would be needed). An additional package D
# in its own module satisfies that condition, reproducing the bug.
! go mod tidy
stderr 'internal error'
go mod tidy
cmp go.mod go.mod.tidy
-- go.mod --
module example.net/a
@ -25,6 +25,22 @@ require (
example.net/d v0.1.0
)
replace (
example.net/b v0.1.0 => ./b
example.net/c v0.1.0 => ./c
example.net/c v0.2.0 => ./c
example.net/d v0.1.0 => ./d
)
-- go.mod.tidy --
module example.net/a
go 1.16
require (
example.net/c v0.2.0 // indirect
example.net/d v0.1.0
)
replace (
example.net/b v0.1.0 => ./b
example.net/c v0.1.0 => ./c