diff --git a/doc/go1.13.html b/doc/go1.13.html
index 4240d4b1a7a00..69bb1b0741b3c 100644
--- a/doc/go1.13.html
+++ b/doc/go1.13.html
@@ -302,8 +302,10 @@ Version validation
between pseudo-versions and
version-control metadata. Specifically:
- - The version prefix must be derived from a tag on the named revision or
- one of its ancestors, or be of the form
vX.0.0.
+ - The version prefix must be of the form
vX.0.0, or derived
+ from a tag on an ancestor of the named revision, or derived from a tag that
+ includes build metadata on
+ the named revision itself.
- The date string must match the UTC timestamp of the revision.
diff --git a/src/cmd/go/internal/modfetch/coderepo.go b/src/cmd/go/internal/modfetch/coderepo.go
index 491fe11f50b84..548c6846d2613 100644
--- a/src/cmd/go/internal/modfetch/coderepo.go
+++ b/src/cmd/go/internal/modfetch/coderepo.go
@@ -479,6 +479,11 @@ func (r *codeRepo) validatePseudoVersion(info *codehost.RevInfo, version string)
return fmt.Errorf("does not match version-control timestamp (%s)", info.Time.UTC().Format(time.RFC3339))
}
+ tagPrefix := ""
+ if r.codeDir != "" {
+ tagPrefix = r.codeDir + "/"
+ }
+
// A pseudo-version should have a precedence just above its parent revisions,
// and no higher. Otherwise, it would be possible for library authors to "pin"
// dependency versions (and bypass the usual minimum version selection) by
@@ -504,11 +509,26 @@ func (r *codeRepo) validatePseudoVersion(info *codehost.RevInfo, version string)
return fmt.Errorf("major version without preceding tag must be v0, not v1")
}
return nil
- }
-
- tagPrefix := ""
- if r.codeDir != "" {
- tagPrefix = r.codeDir + "/"
+ } else {
+ for _, tag := range info.Tags {
+ versionOnly := strings.TrimPrefix(tag, tagPrefix)
+ if versionOnly == base {
+ // The base version is canonical, so if the version from the tag is
+ // literally equal (not just equivalent), then the tag is canonical too.
+ //
+ // We allow pseudo-versions to be derived from non-canonical tags on the
+ // same commit, so that tags like "v1.1.0+some-metadata" resolve as
+ // close as possible to the canonical version ("v1.1.0") while still
+ // enforcing a total ordering ("v1.1.1-0.[…]" with a unique suffix).
+ //
+ // However, canonical tags already have a total ordering, so there is no
+ // reason not to use the canonical tag directly, and we know that the
+ // canonical tag must already exist because the pseudo-version is
+ // derived from it. In that case, referring to the revision by a
+ // pseudo-version derived from its own canonical tag is just confusing.
+ return fmt.Errorf("tag (%s) found on revision %s is already canonical, so should not be replaced with a pseudo-version derived from that tag", tag, rev)
+ }
+ }
}
tags, err := r.code.Tags(tagPrefix + base)
diff --git a/src/cmd/go/internal/modfetch/coderepo_test.go b/src/cmd/go/internal/modfetch/coderepo_test.go
index b5c9be52ad00f..1f2b95bd2384e 100644
--- a/src/cmd/go/internal/modfetch/coderepo_test.go
+++ b/src/cmd/go/internal/modfetch/coderepo_test.go
@@ -83,6 +83,26 @@ var codeRepoTests = []codeRepoTest{
"pkg/p.go",
},
},
+ {
+ vcs: "git",
+ path: "github.com/rsc/vgotest1",
+ rev: "v0.0.0-20180219231006-80d85c5d4d17",
+ version: "v0.0.0-20180219231006-80d85c5d4d17",
+ name: "80d85c5d4d17598a0e9055e7c175a32b415d6128",
+ short: "80d85c5d4d17",
+ time: time.Date(2018, 2, 19, 23, 10, 6, 0, time.UTC),
+ zip: []string{
+ "LICENSE",
+ "README.md",
+ "pkg/p.go",
+ },
+ },
+ {
+ vcs: "git",
+ path: "github.com/rsc/vgotest1",
+ rev: "v0.0.1-0.20180219231006-80d85c5d4d17",
+ err: `github.com/rsc/vgotest1@v0.0.1-0.20180219231006-80d85c5d4d17: invalid pseudo-version: tag (v0.0.0) found on revision 80d85c5d4d17 is already canonical, so should not be replaced with a pseudo-version derived from that tag`,
+ },
{
vcs: "git",
path: "github.com/rsc/vgotest1",
@@ -515,7 +535,7 @@ func TestCodeRepo(t *testing.T) {
}
var hgmap = map[string]string{
- "github.com/rsc/vgotest1/": "vcs-test.golang.org/hg/vgotest1.hg/",
+ "github.com/rsc/vgotest1": "vcs-test.golang.org/hg/vgotest1.hg",
"f18795870fb14388a21ef3ebc1d75911c8694f31": "a9ad6d1d14eb544f459f446210c7eb3b009807c6",
"ea65f87c8f52c15ea68f3bdd9925ef17e20d91e9": "f1fc0f22021b638d073d31c752847e7bf385def7",
"b769f2de407a4db81af9c5de0a06016d60d2ea09": "92c7eb888b4fac17f1c6bd2e1060a1b881a3b832",
diff --git a/src/cmd/go/testdata/script/mod_invalid_version.txt b/src/cmd/go/testdata/script/mod_invalid_version.txt
index 2be0d01cce95d..a587b4422f888 100644
--- a/src/cmd/go/testdata/script/mod_invalid_version.txt
+++ b/src/cmd/go/testdata/script/mod_invalid_version.txt
@@ -144,6 +144,16 @@ cd ..
! go list -m golang.org/x/text
stderr 'golang.org/x/text@v0.2.1-0.20170915032832-14c0d48ead0c: invalid pseudo-version: revision 14c0d48ead0c is not a descendent of preceding tag \(v0.2.0\)'
+# A pseudo-version derived from a canonical tag on the same revision is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.2.1-0.20171213102548-c4d099d611ac
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.2.1-0.20171213102548-c4d099d611ac: invalid pseudo-version: tag \(v0.2.0\) found on revision c4d099d611ac is already canonical, so should not be replaced with a pseudo-version derived from that tag'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.2.1-0.20171213102548-c4d099d611ac: invalid pseudo-version: tag \(v0.2.0\) found on revision c4d099d611ac is already canonical, so should not be replaced with a pseudo-version derived from that tag'
+
# A +incompatible suffix is not allowed on a version that is actually compatible.
cp go.mod.orig go.mod
go mod edit -require golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0c+incompatible
@@ -165,15 +175,15 @@ go list -m github.com/pierrec/lz4
stdout 'github.com/pierrec/lz4 v1.0.2-0.20190131084431-473cd7ce01a1'
cd ..
-# A +incompatible version for a module that has an explicit go.mod file is invalid.
+# A +incompatible pseudo-version for a module that has an explicit go.mod file is invalid.
cp go.mod.orig go.mod
-go mod edit -require github.com/pierrec/lz4@v2.0.9-0.20190131084431-473cd7ce01a1+incompatible
+go mod edit -require github.com/pierrec/lz4@v2.0.9-0.20190209155647-9a39efadad3d+incompatible
cd outside
! go list -m github.com/pierrec/lz4
-stderr 'go: example.com@v0.0.0 requires\n\tgithub.com/pierrec/lz4@v2.0.9-0.20190131084431-473cd7ce01a1\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
+stderr 'go: example.com@v0.0.0 requires\n\tgithub.com/pierrec/lz4@v2.0.9-0.20190209155647-9a39efadad3d\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
cd ..
! go list -m github.com/pierrec/lz4
-stderr 'github.com/pierrec/lz4@v2.0.9-0.20190131084431-473cd7ce01a1\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
+stderr 'github.com/pierrec/lz4@v2.0.9-0.20190209155647-9a39efadad3d\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
# A +incompatible pseudo-version is valid for a revision of the module
# that lacks a go.mod file.