Provided by: gccgo-go_1.24~2_amd64 
NAME
go-list - list packages or modules
SYNOPSIS
go list [-f format] [-json] [-m] [list flags] [build flags] [packages]
DESCRIPTION
List lists the packages named by the import paths, one per line.
The most commonly-used flags are -f and -json, which control the form of the output printed for each
package. Other list flags, documented below, control more specific details.
The default output shows the package import path:
bytes
encoding/json
github.com/gorilla/mux
golang.org/x/net/html
OPTIONS
-f The -f flag specifies an alternate format for the list, using the syntax of package template. The
default output is equivalent to -f '{{.ImportPath}}'. The struct being passed to the template is:
type Package struct {
Dir string // directory containing package sources
ImportPath string // import path of package in dir
ImportComment string // path in import comment on package statement
Name string // package name
Doc string // package documentation string
Target string // install path
Shlib string // the shared library that contains this package (only set when -linkshared)
Goroot bool // is this package in the Go root?
Standard bool // is this package part of the standard Go library?
Stale bool // would 'go install' do anything for this package?
StaleReason string // explanation for Stale==true
Root string // Go root or Go path dir containing this package
ConflictDir string // this directory shadows Dir in $GOPATH
BinaryOnly bool // binary-only package (no longer supported)
ForTest string // package is only for use in named test
Export string // file containing export data (when using -export)
BuildID string // build ID of the compiled package (when using -export)
Module *Module // info about package's containing module, if any (can be nil)
Match []string // command-line patterns matching this package
DepOnly bool // package is only a dependency, not explicitly listed
// Source files
GoFiles []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
CgoFiles []string // .go source files that import "C"
CompiledGoFiles []string // .go files presented to compiler (when using -compiled)
IgnoredGoFiles []string // .go source files ignored due to build constraints
IgnoredOtherFiles []string // non-.go source files ignored due to build constraints
CFiles []string // .c source files
CXXFiles []string // .cc, .cxx and .cpp source files
MFiles []string // .m source files
HFiles []string // .h, .hh, .hpp and .hxx source files
FFiles []string // .f, .F, .for and .f90 Fortran source files
SFiles []string // .s source files
SwigFiles []string // .swig files
SwigCXXFiles []string // .swigcxx files
SysoFiles []string // .syso object files to add to archive
TestGoFiles []string // _test.go files in package
XTestGoFiles []string // _test.go files outside package
// Embedded files
EmbedPatterns []string // //go:embed patterns
EmbedFiles []string // files matched by EmbedPatterns
TestEmbedPatterns []string // //go:embed patterns in TestGoFiles
TestEmbedFiles []string // files matched by TestEmbedPatterns
XTestEmbedPatterns []string // //go:embed patterns in XTestGoFiles
XTestEmbedFiles []string // files matched by XTestEmbedPatterns
// Cgo directives
CgoCFLAGS []string // cgo: flags for C compiler
CgoCPPFLAGS []string // cgo: flags for C preprocessor
CgoCXXFLAGS []string // cgo: flags for C++ compiler
CgoFFLAGS []string // cgo: flags for Fortran compiler
CgoLDFLAGS []string // cgo: flags for linker
CgoPkgConfig []string // cgo: pkg-config names
// Dependency information
Imports []string // import paths used by this package
ImportMap map[string]string // map from source import to ImportPath (identity entries omitted)
Deps []string // all (recursively) imported dependencies
TestImports []string // imports from TestGoFiles
XTestImports []string // imports from XTestGoFiles
// Error information
Incomplete bool // this package or a dependency has an error
Error *PackageError // error loading package
DepsErrors []*PackageError // errors loading dependencies
}
Packages stored in vendor directories report an ImportPath that includes the path to the vendor
directory (for example, "d/vendor/p" instead of "p"), so that the ImportPath uniquely identifies a
given copy of a package. The Imports, Deps, TestImports, and XTestImports lists also contain
these expanded import paths. See golang.org/s/go15vendor for more about vendoring.
The error information, if any, is
type PackageError struct {
ImportStack []string // shortest path from package named on command line to this one
Pos string // position of error (if present, file:line:col)
Err string // the error itself
}
The module information is a Module struct, defined in the discussion of list -m below.
The template function "join" calls strings.Join.
The template function "context" returns the build context, defined as:
type Context struct {
GOARCH string // target architecture
GOOS string // target operating system
GOROOT string // Go root
GOPATH string // Go path
CgoEnabled bool // whether cgo can be used
UseAllFiles bool // use files regardless of +build lines, file names
Compiler string // compiler to assume when computing target paths
BuildTags []string // build constraints to match in +build lines
ToolTags []string // toolchain-specific build constraints
ReleaseTags []string // releases the current release is compatible with
InstallSuffix string // suffix to use in the name of the install dir
}
For more information about the meaning of these fields see the documentation for the go/build
package's Context type.
-json The -json flag causes the package data to be printed in JSON format instead of using the template
format. The JSON flag can optionally be provided with a set of comma-separated required field
names to be output. If so, those required fields will always appear in JSON output, but others
may be omitted to save work in computing the JSON struct.
-compiled
The -compiled flag causes list to set CompiledGoFiles to the Go source files presented to the
compiler. Typically this means that it repeats the files listed in GoFiles and then also adds the
Go code generated by processing CgoFiles and SwigFiles. The Imports list contains the union of all
imports from both GoFiles and CompiledGoFiles.
-deps The -deps flag causes list to iterate over not just the named packages but also all their
dependencies. It visits them in a depth-first post-order traversal, so that a package is listed
only after all its dependencies. Packages not explicitly listed on the command line will have the
DepOnly field set to true.
-e The -e flag changes the handling of erroneous packages, those that cannot be found or are
malformed. By default, the list command prints an error to standard error for each erroneous
package and omits the packages from consideration during the usual printing. With the -e flag,
the list command never prints errors to standard error and instead processes the erroneous
packages with the usual printing. Erroneous packages will have a non-empty ImportPath and a non-
nil Error field; other information may or may not be missing (zeroed).
-export
The -export flag causes list to set the Export field to the name of a file containing up-to-date
export information for the given package, and the BuildID field to the build ID of the compiled
package.
-find The -find flag causes list to identify the named packages but not resolve their dependencies: the
Imports and Deps lists will be empty.
-test The -test flag causes list to report not only the named packages but also their test binaries (for
packages with tests), to convey to source code analysis tools exactly how test binaries are
constructed. The reported import path for a test binary is the import path of the package
followed by a ".test" suffix, as in "math/rand.test". When building a test, it is sometimes
necessary to rebuild certain dependencies specially for that test (most commonly the tested
package itself). The reported import path of a package recompiled for a particular test binary is
followed by a space and the name of the test binary in brackets, as in "math/rand
[math/rand.test]" or "regexp [sort.test]". The ForTest field is also set to the name of the
package being tested ("math/rand" or "sort" in the previous examples).
The Dir, Target, Shlib, Root, ConflictDir, and Export file paths are all absolute paths.
By default, the lists GoFiles, CgoFiles, and so on hold names of files in Dir (that is, paths relative to
Dir, not absolute paths). The generated files added when using the -compiled and -test flags are
absolute paths referring to cached copies of generated Go source files. Although they are Go source
files, the paths may not end in ".go".
-m The -m flag causes list to list modules instead of packages.
When listing modules, the -f flag still specifies a format template applied to a Go struct, but
now a Module struct:
type Module struct {
Path string // module path
Query string // version query corresponding to this version
Version string // module version
Versions []string // available module versions
Replace *Module // replaced by this module
Time *time.Time // time version was created
Update *Module // available update (with -u)
Main bool // is this the main module?
Indirect bool // module is only indirectly needed by main module
Dir string // directory holding local copy of files, if any
GoMod string // path to go.mod file describing module, if any
GoVersion string // go version used in module
Retracted []string // retraction information, if any (with -retracted or -u)
Deprecated string // deprecation message, if any (with -u)
Error *ModuleError // error loading module
Origin any // provenance of module
Reuse bool // reuse of old module info is safe
}
type ModuleError struct {
Err string // the error itself
}
The file GoMod refers to may be outside the module directory if the module is in the module cache
or if the -modfile flag is used.
The default output is to print the module path and then information about the version and
replacement if any. For example, 'go list -m all' might print:
my/main/module
golang.org/x/text v0.3.0 => /tmp/text
rsc.io/pdf v0.1.1
The Module struct has a String method that formats this line of output, so that the default format
is equivalent to -f '{{.String}}'.
Note that when a module has been replaced, its Replace field describes the replacement module, and
its Dir field is set to the replacement's source code, if present. (That is, if Replace is non-
nil, then Dir is set to Replace.Dir, with no access to the replaced source code.)
-u The -u flag adds information about available upgrades. When the latest version of a given module
is newer than the current one, list -u sets the Module's Update field to information about the
newer module. list -u will also set the module's Retracted field if the current version is
retracted. The Module's String method indicates an available upgrade by formatting the newer
version in brackets after the current version. If a version is retracted, the string
"(retracted)" will follow it. For example, 'go list -m -u all' might print:
my/main/module
golang.org/x/text v0.3.0 [v0.4.0] => /tmp/text
rsc.io/pdf v0.1.1 (retracted) [v0.1.2]
(For tools, 'go list -m -u -json all' may be more convenient to parse.)
-versions
The -versions flag causes list to set the Module's Versions field to a list of all known versions
of that module, ordered according to semantic versioning, earliest to latest. The flag also
changes the default output format to display the module path followed by the space-separated
version list.
-retracted
The -retracted flag causes list to report information about retracted module versions. When
-retracted is used with -f or -json, the Retracted field will be set to a string explaining why
the version was retracted. The string is taken from comments on the retract directive in the
module's go.mod file. When -retracted is used with -versions, retracted versions are listed
together with unretracted versions. The -retracted flag may be used with or without -m.
The arguments to list -m are interpreted as a list of modules, not packages. The main module is the
module containing the current directory. The active modules are the main module and its dependencies.
With no arguments, list -m shows the main module. With arguments, list -m shows the modules specified by
the arguments. Any of the active modules can be specified by its module path. The special pattern "all"
specifies all the active modules, first the main module and then dependencies sorted by module path. A
pattern containing "..." specifies the active modules whose module paths match the pattern. A query of
the form path@version specifies the result of that query, which is not limited to active modules. See
'go help modules' for more about module queries.
The template function "module" takes a single string argument that must be a module path or query and
returns the specified module as a Module struct. If an error occurs, the result will be a Module struct
with a non-nil Error field.
When using -m, the -reuse=old.json flag accepts the name of file containing the JSON output of a previous
‘go list -m -json’ invocation with the same set of modifier flags (such as -u, -retracted, and
-versions). The go command may use this file to determine that a module is unchanged since the previous
invocation and avoid redownloading information about it. Modules that are not redownloaded will be
marked in the new output by setting the Reuse field to true. Normally the module cache provides this kind
of reuse automatically; the -reuse flag can be useful on systems that do not preserve the module cache.
For more about build flags, see go-build(1) or 'go help build'.
For more about specifying packages, see go-packages(7) or 'go help packages'.
For more about modules, see https://golang.org/ref/mod.
AUTHOR
This manual page was written by Michael Stapelberg <stapelberg@debian.org> and is maintained by the
Debian Go Compiler Team <team+go-compiler@tracker.debian.org> based on the output of 'go help list' for
the Debian project (and may be used by others).
2022-08-02 GO-LIST(1)