/usr/share/gocode/src/github.com/constabulary/gb/build.go is in golang-github-constabulary-gb-dev 0.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"errors"
"fmt"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/constabulary/gb/internal/debug"
"github.com/constabulary/gb/internal/fileutils"
)
// Build builds each of pkgs in succession. If pkg is a command, then the results of build include
// linking the final binary into pkg.Context.Bindir().
func Build(pkgs ...*Package) error {
build, err := BuildPackages(pkgs...)
if err != nil {
return err
}
return ExecuteConcurrent(build, runtime.NumCPU(), nil)
}
// BuildPackages produces a tree of *Actions that can be executed to build
// a *Package.
// BuildPackages walks the tree of *Packages and returns a corresponding
// tree of *Actions representing the steps required to build *Package
// and any of its dependencies
func BuildPackages(pkgs ...*Package) (*Action, error) {
if len(pkgs) < 1 {
return nil, errors.New("no packages supplied")
}
targets := make(map[string]*Action) // maps package importpath to build action
names := func(pkgs []*Package) []string {
var names []string
for _, pkg := range pkgs {
names = append(names, pkg.ImportPath)
}
return names
}
// create top level build action to unify all packages
t0 := time.Now()
build := Action{
Name: fmt.Sprintf("build: %s", strings.Join(names(pkgs), ",")),
Run: func() error {
debug.Debugf("build duration: %v %v", time.Since(t0), pkgs[0].Statistics.String())
return nil
},
}
for _, pkg := range pkgs {
if len(pkg.GoFiles)+len(pkg.CgoFiles) == 0 {
debug.Debugf("skipping %v: no go files", pkg.ImportPath)
continue
}
a, err := BuildPackage(targets, pkg)
if err != nil {
return nil, err
}
if a == nil {
// nothing to do
continue
}
build.Deps = append(build.Deps, a)
}
return &build, nil
}
// BuildPackage returns an Action representing the steps required to
// build this package.
func BuildPackage(targets map[string]*Action, pkg *Package) (*Action, error) {
// if this action is already present in the map, return it
// rather than creating a new action.
if a, ok := targets[pkg.ImportPath]; ok {
return a, nil
}
// step 0. are we stale ?
// if this package is not stale, then by definition none of its
// dependencies are stale, so ignore this whole tree.
if pkg.NotStale {
return nil, nil
}
// step 1. build dependencies
deps, err := BuildDependencies(targets, pkg)
if err != nil {
return nil, err
}
// step 2. build this package
build, err := Compile(pkg, deps...)
if err != nil {
return nil, err
}
if build == nil {
panic("build action was nil") // shouldn't happen
}
// record the final action as the action that represents
// building this package.
targets[pkg.ImportPath] = build
return build, nil
}
// Compile returns an Action representing the steps required to compile this package.
func Compile(pkg *Package, deps ...*Action) (*Action, error) {
var gofiles []string
gofiles = append(gofiles, pkg.GoFiles...)
// step 1. are there any .c files that we have to run cgo on ?
var ofiles []string // additional ofiles to pack
if len(pkg.CgoFiles) > 0 {
cgoACTION, cgoOFILES, cgoGOFILES, err := cgo(pkg)
if err != nil {
return nil, err
}
gofiles = append(gofiles, cgoGOFILES...)
ofiles = append(ofiles, cgoOFILES...)
deps = append(deps, cgoACTION)
}
if len(gofiles) == 0 {
return nil, fmt.Errorf("compile %q: no go files supplied", pkg.ImportPath)
}
// step 2. compile all the go files for this package, including pkg.CgoFiles
compile := Action{
Name: fmt.Sprintf("compile: %s", pkg.ImportPath),
Deps: deps,
Run: func() error { return gc(pkg, gofiles) },
}
// step 3. are there any .s files to assemble.
var assemble []*Action
for _, sfile := range pkg.SFiles {
sfile := sfile
ofile := filepath.Join(pkg.Context.Workdir(), pkg.ImportPath, stripext(sfile)+".6")
assemble = append(assemble, &Action{
Name: fmt.Sprintf("asm: %s/%s", pkg.ImportPath, sfile),
Run: func() error {
t0 := time.Now()
err := pkg.tc.Asm(pkg, ofile, filepath.Join(pkg.Dir, sfile))
pkg.Record("asm", time.Since(t0))
return err
},
// asm depends on compile because compile will generate the local go_asm.h
Deps: []*Action{&compile},
})
ofiles = append(ofiles, ofile)
}
// step 4. add system object files.
for _, syso := range pkg.SysoFiles {
ofiles = append(ofiles, filepath.Join(pkg.Dir, syso))
}
build := &compile
// Do we need to pack ? Yes, replace build action with pack.
if len(ofiles) > 0 {
pack := Action{
Name: fmt.Sprintf("pack: %s", pkg.ImportPath),
Deps: []*Action{
&compile,
},
Run: func() error {
// collect .o files, ofiles always starts with the gc compiled object.
// TODO(dfc) objfile(pkg) should already be at the top of this set
ofiles = append(
[]string{pkg.objfile()},
ofiles...,
)
// pack
t0 := time.Now()
err := pkg.tc.Pack(pkg, ofiles...)
pkg.Record("pack", time.Since(t0))
return err
},
}
pack.Deps = append(pack.Deps, assemble...)
build = &pack
}
// should this package be cached
if pkg.Install && !pkg.TestScope {
build = &Action{
Name: fmt.Sprintf("install: %s", pkg.ImportPath),
Deps: []*Action{build},
Run: func() error { return fileutils.Copyfile(pkg.installpath(), pkg.objfile()) },
}
}
// if this is a main package, add a link stage
if pkg.Main {
build = &Action{
Name: fmt.Sprintf("link: %s", pkg.ImportPath),
Deps: []*Action{build},
Run: func() error { return pkg.link() },
}
}
if !pkg.TestScope {
// if this package is not compiled in test scope, then
// log the name of the package when complete.
build.Run = logInfoFn(build.Run, pkg.ImportPath)
}
return build, nil
}
func logInfoFn(fn func() error, s string) func() error {
return func() error {
err := fn()
fmt.Println(s)
return err
}
}
// BuildDependencies returns a slice of Actions representing the steps required
// to build all dependant packages of this package.
func BuildDependencies(targets map[string]*Action, pkg *Package) ([]*Action, error) {
var deps []*Action
pkgs := pkg.Imports
var extra []string
switch {
case pkg.Main:
// all binaries depend on runtime, even if they do not
// explicitly import it.
extra = append(extra, "runtime")
if pkg.race {
// race binaries have extra implicit depdendenceis.
extra = append(extra, "runtime/race")
}
case len(pkg.CgoFiles) > 0 && pkg.ImportPath != "runtime/cgo":
// anything that uses cgo has a dependency on runtime/cgo which is
// only visible after cgo file generation.
extra = append(extra, "runtime/cgo")
}
for _, i := range extra {
p, err := pkg.ResolvePackage(i)
if err != nil {
return nil, err
}
pkgs = append(pkgs, p)
}
for _, i := range pkgs {
a, err := BuildPackage(targets, i)
if err != nil {
return nil, err
}
if a == nil {
// no action required for this Package
continue
}
deps = append(deps, a)
}
return deps, nil
}
func gc(pkg *Package, gofiles []string) error {
t0 := time.Now()
for i := range gofiles {
if filepath.IsAbs(gofiles[i]) {
// terrible hack for cgo files which come with an absolute path
continue
}
fullpath := filepath.Join(pkg.Dir, gofiles[i])
path, err := filepath.Rel(pkg.Dir, fullpath)
if err == nil {
gofiles[i] = path
} else {
gofiles[i] = fullpath
}
}
err := pkg.tc.Gc(pkg, gofiles)
pkg.Record("gc", time.Since(t0))
return err
}
func (pkg *Package) link() error {
t0 := time.Now()
err := pkg.tc.Ld(pkg)
pkg.Record("link", time.Since(t0))
return err
}
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