modload

package
Version: v0.0.0-...-4df6dd4 Latest Latest
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Published: Sep 4, 2018 License: BSD-3-Clause Imports: 32 Imported by: 0

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Constants

This section is empty.

Variables

View Source
var (
	MustUseModules = mustUseModules()

	ModRoot string

	Target module.Version

	CmdModInit   bool   // running 'go mod init'
	CmdModModule string // module argument for 'go mod init'
)
View Source
var ErrRequire = errors.New("error loading module requirements")

ErrRequire is the sentinel error returned when Require encounters problems. It prints the problems directly to standard error, so that multiple errors can be displayed easily.

View Source
var HelpGoMod = &base.Command{
	UsageLine: "go.mod",
	Short:     "the go.mod file",
	Long: `
A module version is defined by a tree of source files, with a go.mod
file in its root. When the go command is run, it looks in the current
directory and then successive parent directories to find the go.mod
marking the root of the main (current) module.

The go.mod file itself is line-oriented, with // comments but
no /* */ comments. Each line holds a single directive, made up of a
verb followed by arguments. For example:

	module my/thing
	require other/thing v1.0.2
	require new/thing v2.3.4
	exclude old/thing v1.2.3
	replace bad/thing v1.4.5 => good/thing v1.4.5

The verbs are module, to define the module path; require, to require
a particular module at a given version or later; exclude, to exclude
a particular module version from use; and replace, to replace a module
version with a different module version. Exclude and replace apply only
in the main module's go.mod and are ignored in dependencies.
See https://research.swtch.com/vgo-mvs for details.

The leading verb can be factored out of adjacent lines to create a block,
like in Go imports:

	require (
		new/thing v2.3.4
		old/thing v1.2.3
	)

The go.mod file is designed both to be edited directly and to be
easily updated by tools. The 'go mod edit' command can be used to
parse and edit the go.mod file from programs and tools.
See 'go help mod edit'.

The go command automatically updates go.mod each time it uses the
module graph, to make sure go.mod always accurately reflects reality
and is properly formatted. For example, consider this go.mod file:

        module M

        require (
                A v1
                B v1.0.0
                C v1.0.0
                D v1.2.3
                E dev
        )

        exclude D v1.2.3

The update rewrites non-canonical version identifiers to semver form,
so A's v1 becomes v1.0.0 and E's dev becomes the pseudo-version for the
latest commit on the dev branch, perhaps v0.0.0-20180523231146-b3f5c0f6e5f1.

The update modifies requirements to respect exclusions, so the
requirement on the excluded D v1.2.3 is updated to use the next
available version of D, perhaps D v1.2.4 or D v1.3.0.

The update removes redundant or misleading requirements.
For example, if A v1.0.0 itself requires B v1.2.0 and C v1.0.0,
then go.mod's requirement of B v1.0.0 is misleading (superseded by
A's need for v1.2.0), and its requirement of C v1.0.0 is redundant
(implied by A's need for the same version), so both will be removed.
If module M contains packages that directly import packages from B or
C, then the requirements will be kept but updated to the actual
versions being used.

Finally, the update reformats the go.mod in a canonical formatting, so
that future mechanical changes will result in minimal diffs.

Because the module graph defines the meaning of import statements, any
commands that load packages also use and therefore update go.mod,
including go build, go get, go install, go list, go test, go mod graph,
go mod tidy, and go mod why.
	`,
}
View Source
var HelpModules = &base.Command{
	UsageLine: "modules",
	Short:     "modules, module versions, and more",
	Long: `
A module is a collection of related Go packages.
Modules are the unit of source code interchange and versioning.
The go command has direct support for working with modules,
including recording and resolving dependencies on other modules.
Modules replace the old GOPATH-based approach to specifying
which source files are used in a given build.

Preliminary module support

Go 1.11 includes preliminary support for Go modules,
including a new module-aware 'go get' command.
We intend to keep revising this support, while preserving compatibility,
until it can be declared official (no longer preliminary),
and then at a later point we may remove support for work
in GOPATH and the old 'go get' command.

The quickest way to take advantage of the new Go 1.11 module support
is to check out your repository into a directory outside GOPATH/src,
create a go.mod file (described in the next section) there, and run
go commands from within that file tree.

For more fine-grained control, the module support in Go 1.11 respects
a temporary environment variable, GO111MODULE, which can be set to one
of three string values: off, on, or auto (the default).
If GO111MODULE=off, then the go command never uses the
new module support. Instead it looks in vendor directories and GOPATH
to find dependencies; we now refer to this as "GOPATH mode."
If GO111MODULE=on, then the go command requires the use of modules,
never consulting GOPATH. We refer to this as the command being
module-aware or running in "module-aware mode".
If GO111MODULE=auto or is unset, then the go command enables or
disables module support based on the current directory.
Module support is enabled only when the current directory is outside
GOPATH/src and itself contains a go.mod file or is below a directory
containing a go.mod file.

In module-aware mode, GOPATH no longer defines the meaning of imports
during a build, but it still stores downloaded dependencies (in GOPATH/pkg/mod)
and installed commands (in GOPATH/bin, unless GOBIN is set).

Defining a module

A module is defined by a tree of Go source files with a go.mod file
in the tree's root directory. The directory containing the go.mod file
is called the module root. Typically the module root will also correspond
to a source code repository root (but in general it need not).
The module is the set of all Go packages in the module root and its
subdirectories, but excluding subtrees with their own go.mod files.

The "module path" is the import path prefix corresponding to the module root.
The go.mod file defines the module path and lists the specific versions
of other modules that should be used when resolving imports during a build,
by giving their module paths and versions.

For example, this go.mod declares that the directory containing it is the root
of the module with path example.com/m, and it also declares that the module
depends on specific versions of golang.org/x/text and gopkg.in/yaml.v2:

	module example.com/m

	require (
		golang.org/x/text v0.3.0
		gopkg.in/yaml.v2 v2.1.0
	)

The go.mod file can also specify replacements and excluded versions
that only apply when building the module directly; they are ignored
when the module is incorporated into a larger build.
For more about the go.mod file, see 'go help go.mod'.

To start a new module, simply create a go.mod file in the root of the
module's directory tree, containing only a module statement.
The 'go mod init' command can be used to do this:

	go mod init example.com/m

In a project already using an existing dependency management tool like
godep, glide, or dep, 'go mod init' will also add require statements
matching the existing configuration.

Once the go.mod file exists, no additional steps are required:
go commands like 'go build', 'go test', or even 'go list' will automatically
add new dependencies as needed to satisfy imports.

The main module and the build list

The "main module" is the module containing the directory where the go command
is run. The go command finds the module root by looking for a go.mod in the
current directory, or else the current directory's parent directory,
or else the parent's parent directory, and so on.

The main module's go.mod file defines the precise set of packages available
for use by the go command, through require, replace, and exclude statements.
Dependency modules, found by following require statements, also contribute
to the definition of that set of packages, but only through their go.mod
files' require statements: any replace and exclude statements in dependency
modules are ignored. The replace and exclude statements therefore allow the
main module complete control over its own build, without also being subject
to complete control by dependencies.

The set of modules providing packages to builds is called the "build list".
The build list initially contains only the main module. Then the go command
adds to the list the exact module versions required by modules already
on the list, recursively, until there is nothing left to add to the list.
If multiple versions of a particular module are added to the list,
then at the end only the latest version (according to semantic version
ordering) is kept for use in the build.

The 'go list' command provides information about the main module
and the build list. For example:

	go list -m              # print path of main module
	go list -m -f={{.Dir}}  # print root directory of main module
	go list -m all          # print build list

Maintaining module requirements

The go.mod file is meant to be readable and editable by both
programmers and tools. The go command itself automatically updates the go.mod file
to maintain a standard formatting and the accuracy of require statements.

Any go command that finds an unfamiliar import will look up the module
containing that import and add the latest version of that module
to go.mod automatically. In most cases, therefore, it suffices to
add an import to source code and run 'go build', 'go test', or even 'go list':
as part of analyzing the package, the go command will discover
and resolve the import and update the go.mod file.

Any go command can determine that a module requirement is
missing and must be added, even when considering only a single
package from the module. On the other hand, determining that a module requirement
is no longer necessary and can be deleted requires a full view of
all packages in the module, across all possible build configurations
(architectures, operating systems, build tags, and so on).
The 'go mod tidy' command builds that view and then
adds any missing module requirements and removes unnecessary ones.

As part of maintaining the require statements in go.mod, the go command
tracks which ones provide packages imported directly by the current module
and which ones provide packages only used indirectly by other module
dependencies. Requirements needed only for indirect uses are marked with a
"// indirect" comment in the go.mod file. Indirect requirements are
automatically removed from the go.mod file once they are implied by other
direct requirements. Indirect requirements only arise when using modules
that fail to state some of their own dependencies or when explicitly
upgrading a module's dependencies ahead of its own stated requirements.

Because of this automatic maintenance, the information in go.mod is an
up-to-date, readable description of the build.

The 'go get' command updates go.mod to change the module versions used in a
build. An upgrade of one module may imply upgrading others, and similarly a
downgrade of one module may imply downgrading others. The 'go get' command
makes these implied changes as well. If go.mod is edited directly, commands
like 'go build' or 'go list' will assume that an upgrade is intended and
automatically make any implied upgrades and update go.mod to reflect them.

The 'go mod' command provides other functionality for use in maintaining
and understanding modules and go.mod files. See 'go help mod'.

The -mod build flag provides additional control over updating and use of go.mod.

If invoked with -mod=readonly, the go command is disallowed from the implicit
automatic updating of go.mod described above. Instead, it fails when any changes
to go.mod are needed. This setting is most useful to check that go.mod does
not need updates, such as in a continuous integration and testing system.
The "go get" command remains permitted to update go.mod even with -mod=readonly,
and the "go mod" commands do not take the -mod flag (or any other build flags).

If invoked with -mod=vendor, the go command assumes that the vendor
directory holds the correct copies of dependencies and ignores
the dependency descriptions in go.mod.

Pseudo-versions

The go.mod file and the go command more generally use semantic versions as
the standard form for describing module versions, so that versions can be
compared to determine which should be considered earlier or later than another.
A module version like v1.2.3 is introduced by tagging a revision in the
underlying source repository. Untagged revisions can be referred to
using a "pseudo-version" like v0.0.0-yyyymmddhhmmss-abcdefabcdef,
where the time is the commit time in UTC and the final suffix is the prefix
of the commit hash. The time portion ensures that two pseudo-versions can
be compared to determine which happened later, the commit hash identifes
the underlying commit, and the prefix (v0.0.0- in this example) is derived from
the most recent tagged version in the commit graph before this commit.

There are three pseudo-version forms:

vX.0.0-yyyymmddhhmmss-abcdefabcdef is used when there is no earlier
versioned commit with an appropriate major version before the target commit.
(This was originally the only form, so some older go.mod files use this form
even for commits that do follow tags.)

vX.Y.Z-pre.0.yyyymmddhhmmss-abcdefabcdef is used when the most
recent versioned commit before the target commit is vX.Y.Z-pre.

vX.Y.(Z+1)-0.yyyymmddhhmmss-abcdefabcdef is used when the most
recent versioned commit before the target commit is vX.Y.Z.

Pseudo-versions never need to be typed by hand: the go command will accept
the plain commit hash and translate it into a pseudo-version (or a tagged
version if available) automatically. This conversion is an example of a
module query.

Module queries

The go command accepts a "module query" in place of a module version
both on the command line and in the main module's go.mod file.
(After evaluating a query found in the main module's go.mod file,
the go command updates the file to replace the query with its result.)

A fully-specified semantic version, such as "v1.2.3",
evaluates to that specific version.

A semantic version prefix, such as "v1" or "v1.2",
evaluates to the latest available tagged version with that prefix.

A semantic version comparison, such as "<v1.2.3" or ">=v1.5.6",
evaluates to the available tagged version nearest to the comparison target
(the latest version for < and <=, the earliest version for > and >=).

The string "latest" matches the latest available tagged version,
or else the underlying source repository's latest untagged revision.

A revision identifier for the underlying source repository,
such as a commit hash prefix, revision tag, or branch name,
selects that specific code revision. If the revision is
also tagged with a semantic version, the query evaluates to
that semantic version. Otherwise the query evaluates to a
pseudo-version for the commit.

All queries prefer release versions to pre-release versions.
For example, "<v1.2.3" will prefer to return "v1.2.2"
instead of "v1.2.3-pre1", even though "v1.2.3-pre1" is nearer
to the comparison target.

Module versions disallowed by exclude statements in the
main module's go.mod are considered unavailable and cannot
be returned by queries.

For example, these commands are all valid:

	go get github.com/gorilla/mux@latest    # same (@latest is default for 'go get')
	go get github.com/gorilla/mux@v1.6.2    # records v1.6.2
	go get github.com/gorilla/mux@e3702bed2 # records v1.6.2
	go get github.com/gorilla/mux@c856192   # records v0.0.0-20180517173623-c85619274f5d
	go get github.com/gorilla/mux@master    # records current meaning of master

Module compatibility and semantic versioning

The go command requires that modules use semantic versions and expects that
the versions accurately describe compatibility: it assumes that v1.5.4 is a
backwards-compatible replacement for v1.5.3, v1.4.0, and even v1.0.0.
More generally the go command expects that packages follow the
"import compatibility rule", which says:

"If an old package and a new package have the same import path,
the new package must be backwards compatible with the old package."

Because the go command assumes the import compatibility rule,
a module definition can only set the minimum required version of one
of its dependencies: it cannot set a maximum or exclude selected versions.
Still, the import compatibility rule is not a guarantee: it may be that
v1.5.4 is buggy and not a backwards-compatible replacement for v1.5.3.
Because of this, the go command never updates from an older version
to a newer version of a module unasked.

In semantic versioning, changing the major version number indicates a lack
of backwards compatibility with earlier versions. To preserve import
compatibility, the go command requires that modules with major version v2
or later use a module path with that major version as the final element.
For example, version v2.0.0 of example.com/m must instead use module path
example.com/m/v2, and packages in that module would use that path as
their import path prefix, as in example.com/m/v2/sub/pkg. Including the
major version number in the module path and import paths in this way is
called "semantic import versioning". Pseudo-versions for modules with major
version v2 and later begin with that major version instead of v0, as in
v2.0.0-20180326061214-4fc5987536ef.

As a special case, module paths beginning with gopkg.in/ continue to use the
conventions established on that system: the major version is always present,
and it is preceded by a dot instead of a slash: gopkg.in/yaml.v1
and gopkg.in/yaml.v2, not gopkg.in/yaml and gopkg.in/yaml/v2.

The go command treats modules with different module paths as unrelated:
it makes no connection between example.com/m and example.com/m/v2.
Modules with different major versions can be used together in a build
and are kept separate by the fact that their packages use different
import paths.

In semantic versioning, major version v0 is for initial development,
indicating no expectations of stability or backwards compatibility.
Major version v0 does not appear in the module path, because those
versions are preparation for v1.0.0, and v1 does not appear in the
module path either.

Code written before the semantic import versioning convention
was introduced may use major versions v2 and later to describe
the same set of unversioned import paths as used in v0 and v1.
To accommodate such code, if a source code repository has a
v2.0.0 or later tag for a file tree with no go.mod, the version is
considered to be part of the v1 module's available versions
and is given an +incompatible suffix when converted to a module
version, as in v2.0.0+incompatible. The +incompatible tag is also
applied to pseudo-versions derived from such versions, as in
v2.0.1-0.yyyymmddhhmmss-abcdefabcdef+incompatible.

In general, having a dependency in the build list (as reported by 'go list -m all')
on a v0 version, pre-release version, pseudo-version, or +incompatible version
is an indication that problems are more likely when upgrading that
dependency, since there is no expectation of compatibility for those.

See https://research.swtch.com/vgo-import for more information about
semantic import versioning, and see https://semver.org/ for more about
semantic versioning.

Module code layout

For now, see https://research.swtch.com/vgo-module for information
about how source code in version control systems is mapped to
module file trees.

Module downloading and verification

The go command maintains, in the main module's root directory alongside
go.mod, a file named go.sum containing the expected cryptographic checksums
of the content of specific module versions. Each time a dependency is
used, its checksum is added to go.sum if missing or else required to match
the existing entry in go.sum.

The go command maintains a cache of downloaded packages and computes
and records the cryptographic checksum of each package at download time.
In normal operation, the go command checks these pre-computed checksums
against the main module's go.sum file, instead of recomputing them on
each command invocation. The 'go mod verify' command checks that
the cached copies of module downloads still match both their recorded
checksums and the entries in go.sum.

The go command can fetch modules from a proxy instead of connecting
to source control systems directly, according to the setting of the GOPROXY
environment variable.

See 'go help goproxy' for details about the proxy and also the format of
the cached downloaded packages.

Modules and vendoring

When using modules, the go command completely ignores vendor directories.

By default, the go command satisfies dependencies by downloading modules
from their sources and using those downloaded copies (after verification,
as described in the previous section). To allow interoperation with older
versions of Go, or to ensure that all files used for a build are stored
together in a single file tree, 'go mod vendor' creates a directory named
vendor in the root directory of the main module and stores there all the
packages from dependency modules that are needed to support builds and
tests of packages in the main module.

To build using the main module's top-level vendor directory to satisfy
dependencies (disabling use of the usual network sources and local
caches), use 'go build -mod=vendor'. Note that only the main module's
top-level vendor directory is used; vendor directories in other locations
are still ignored.
	`,
}
View Source
var LoadTests bool

LoadTests controls whether the loaders load tests of the root packages.

Functions

func AllowWriteGoMod

func AllowWriteGoMod()

AllowWriteGoMod undoes the effect of DisallowWriteGoMod: future calls to WriteGoMod will update go.mod if needed. Note that any past calls have been discarded, so typically a call to AlowWriteGoMod should be followed by a call to WriteGoMod.

func Allowed

func Allowed(m module.Version) bool

Allowed reports whether module m is allowed (not excluded) by the main module's go.mod.

func BinDir

func BinDir() string

func BuildList

func BuildList() []module.Version

BuildList returns the module build list, typically constructed by a previous call to LoadBuildList or ImportPaths. The caller must not modify the returned list.

func DirImportPath

func DirImportPath(dir string) string

DirImportPath returns the effective import path for dir, provided it is within the main module, or else returns ".".

func DisallowWriteGoMod

func DisallowWriteGoMod()

DisallowWriteGoMod causes future calls to WriteGoMod to do nothing at all.

func Enabled

func Enabled() bool

Enabled reports whether modules are (or must be) enabled. If modules must be enabled but are not, Enabled returns true and then the first use of module information will call die (usually through InitMod and MustInit).

func Failed

func Failed() bool

Failed reports whether module loading failed. If Failed returns true, then any use of module information will call die.

func FindModulePath

func FindModulePath(dir string) (string, error)

Exported only for testing.

func FindModuleRoot

func FindModuleRoot(dir, limit string, legacyConfigOK bool) (root, file string)

Exported only for testing.

func Import

func Import(path string) (m module.Version, dir string, err error)

Import finds the module and directory in the build list containing the package with the given import path. The answer must be unique: Import returns an error if multiple modules attempt to provide the same package. Import can return a module with an empty m.Path, for packages in the standard library. Import can return an empty directory string, for fake packages like "C" and "unsafe".

If the package cannot be found in the current build list, Import returns an ImportMissingError as the error. If Import can identify a module that could be added to supply the package, the ImportMissingError records that module.

func ImportFromFiles

func ImportFromFiles(gofiles []string)

ImportFromFiles adds modules to the build list as needed to satisfy the imports in the named Go source files.

func ImportMap

func ImportMap(path string) string

ImportMap returns the actual package import path for an import path found in source code. If the given import path does not appear in the source code for the packages that have been loaded, ImportMap returns the empty string.

func ImportPaths

func ImportPaths(patterns []string) []*search.Match

ImportPaths returns the set of packages matching the args (patterns), adding modules to the build list as needed to satisfy new imports.

func Init

func Init()

func InitMod

func InitMod()

func ListModules

func ListModules(args []string, listU, listVersions bool) []*modinfo.ModulePublic

func LoadALL

func LoadALL() []string

LoadALL returns the set of all packages in the current module and their dependencies in any other modules, without filtering due to build tags, except "+build ignore". It adds modules to the build list as needed to satisfy new imports. This set is useful for deciding whether a particular import is needed anywhere in a module.

func LoadBuildList

func LoadBuildList() []module.Version

LoadBuildList loads and returns the build list from go.mod. The loading of the build list happens automatically in ImportPaths: LoadBuildList need only be called if ImportPaths is not (typically in commands that care about the module but no particular package).

func LoadVendor

func LoadVendor() []string

LoadVendor is like LoadALL but only follows test dependencies for tests in the main module. Tests in dependency modules are ignored completely. This set is useful for identifying the which packages to include in a vendor directory.

func Lookup

func Lookup(path string) (dir, realPath string, err error)

Lookup returns the source directory, import path, and any loading error for the package at path. Lookup requires that one of the Load functions in this package has already been called.

func MinReqs

func MinReqs() mvs.Reqs

MinReqs returns a Reqs with minimal dependencies of Target, as will be written to go.mod.

func ModFile

func ModFile() *modfile.File

ModFile returns the parsed go.mod file.

Note that after calling ImportPaths or LoadBuildList, the require statements in the modfile.File are no longer the source of truth and will be ignored: edits made directly will be lost at the next call to WriteGoMod. To make permanent changes to the require statements in go.mod, edit it before calling ImportPaths or LoadBuildList.

func ModInfoProg

func ModInfoProg(info string) []byte

func ModuleInfo

func ModuleInfo(path string) *modinfo.ModulePublic

func ModuleUsedDirectly

func ModuleUsedDirectly(path string) bool

ModuleUsedDirectly reports whether the main module directly imports some package in the module with the given path.

func MustInit

func MustInit()

MustInit calls Init if needed and checks that modules are enabled and the main module has been found. If not, MustInit calls base.Fatalf with an appropriate message.

func PackageBuildInfo

func PackageBuildInfo(path string, deps []string) string

func PackageDir

func PackageDir(path string) string

PackageDir returns the directory containing the source code for the package named by the import path.

func PackageModule

func PackageModule(path string) module.Version

PackageModule returns the module providing the package named by the import path.

func PackageModuleInfo

func PackageModuleInfo(pkgpath string) *modinfo.ModulePublic

func Query

func Query(path, query string, allowed func(module.Version) bool) (*modfetch.RevInfo, error)

Query looks up a revision of a given module given a version query string. The module must be a complete module path. The version must take one of the following forms:

- the literal string "latest", denoting the latest available, allowed tagged version,
  with non-prereleases preferred over prereleases.
  If there are no tagged versions in the repo, latest returns the most recent commit.
- v1, denoting the latest available tagged version v1.x.x.
- v1.2, denoting the latest available tagged version v1.2.x.
- v1.2.3, a semantic version string denoting that tagged version.
- <v1.2.3, <=v1.2.3, >v1.2.3, >=v1.2.3,
   denoting the version closest to the target and satisfying the given operator,
   with non-prereleases preferred over prereleases.
- a repository commit identifier, denoting that commit.

If the allowed function is non-nil, Query excludes any versions for which allowed returns false.

If path is the path of the main module and the query is "latest", Query returns Target.Version as the version.

func QueryPackage

func QueryPackage(path, query string, allowed func(module.Version) bool) (module.Version, *modfetch.RevInfo, error)

QueryPackage looks up a revision of a module containing path.

If multiple modules with revisions matching the query provide the requested package, QueryPackage picks the one with the longest module path.

If the path is in the the main module and the query is "latest", QueryPackage returns Target as the version.

func ReloadBuildList

func ReloadBuildList() []module.Version

func Replacement

func Replacement(mod module.Version) module.Version

Replacement returns the replacement for mod, if any, from go.mod. If there is no replacement for mod, Replacement returns a module.Version with Path == "".

func Reqs

func Reqs() mvs.Reqs

Reqs returns the current module requirement graph. Future calls to SetBuildList do not affect the operation of the returned Reqs.

func SetBuildList

func SetBuildList(list []module.Version)

SetBuildList sets the module build list. The caller is responsible for ensuring that the list is valid. SetBuildList does not retain a reference to the original list.

func TargetPackages

func TargetPackages() []string

TargetPackages returns the list of packages in the target (top-level) module, under all build tag settings.

func Why

func Why(path string) string

Why returns the "go mod why" output stanza for the given package, without the leading # comment. The package graph must have been loaded already, usually by LoadALL. If there is no reason for the package to be in the current build, Why returns an empty string.

func WhyDepth

func WhyDepth(path string) int

WhyDepth returns the number of steps in the Why listing. If there is no reason for the package to be in the current build, WhyDepth returns 0.

func WriteGoMod

func WriteGoMod()

WriteGoMod writes the current build list back to go.mod.

Types

type ImportMissingError

type ImportMissingError struct {
	ImportPath string
	Module     module.Version
}

func (*ImportMissingError) Error

func (e *ImportMissingError) Error() string

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