/usr/share/gocode/src/github.com/constabulary/gb/depfile.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 | package gb
import (
"compress/gzip"
"crypto/sha1"
"fmt"
"go/build"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/constabulary/gb/internal/debug"
"github.com/constabulary/gb/internal/depfile"
"github.com/constabulary/gb/internal/untar"
"github.com/pkg/errors"
)
const semverRegex = `^([0-9]+)\.([0-9]+)\.([0-9]+)(?:(\-[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-\-\.]+)?$`
// addDepfileDeps inserts into the Context's importer list
// a set of importers for entries in the depfile.
func addDepfileDeps(bc *build.Context, ctx *Context) (Importer, error) {
i := Importer(new(nullImporter))
df, err := readDepfile(ctx)
if err != nil {
if !os.IsNotExist(errors.Cause(err)) {
return nil, errors.Wrap(err, "could not parse depfile")
}
debug.Debugf("no depfile, nothing to do.")
return i, nil
}
re := regexp.MustCompile(semverRegex)
for prefix, kv := range df {
if version, ok := kv["version"]; ok {
if !re.MatchString(version) {
return nil, errors.Errorf("%s: %q is not a valid SemVer 2.0.0 version", prefix, version)
}
root := filepath.Join(cachePath(), hash(prefix, version))
dest := filepath.Join(root, "src", filepath.FromSlash(prefix))
fi, err := os.Stat(dest)
if err == nil {
if !fi.IsDir() {
return nil, errors.Errorf("%s is not a directory", dest)
}
}
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
if err := fetchVersion(root, dest, prefix, version); err != nil {
return nil, err
}
}
i = &_importer{
Importer: i,
im: importer{
Context: bc,
Root: root,
},
}
debug.Debugf("Add importer for %q: %v", prefix+" "+version, root)
}
if tag, ok := kv["tag"]; ok {
root := filepath.Join(cachePath(), hash(prefix, tag))
dest := filepath.Join(root, "src", filepath.FromSlash(prefix))
fi, err := os.Stat(dest)
if err == nil {
if !fi.IsDir() {
return nil, errors.Errorf("%s is not a directory", dest)
}
}
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
if err := fetchTag(root, dest, prefix, tag); err != nil {
return nil, err
}
}
i = &_importer{
Importer: i,
im: importer{
Context: bc,
Root: root,
},
}
debug.Debugf("Add importer for %q: %v", prefix+" "+tag, root)
}
}
return i, nil
}
func fetchVersion(root, dest, prefix, version string) error {
if !strings.HasPrefix(prefix, "github.com") {
return errors.Errorf("unable to fetch %v", prefix)
}
fmt.Printf("fetching %v (%v)\n", prefix, version)
rc, err := fetchRelease(prefix, "v"+version)
if err != nil {
return err
}
defer rc.Close()
return unpackReleaseTarball(dest, rc)
}
func fetchTag(root, dest, prefix, tag string) error {
if !strings.HasPrefix(prefix, "github.com") {
return errors.Errorf("unable to fetch %v", prefix)
}
fmt.Printf("fetching %v (%v)\n", prefix, tag)
rc, err := fetchRelease(prefix, tag)
if err != nil {
return err
}
defer rc.Close()
return unpackReleaseTarball(dest, rc)
}
func unpackReleaseTarball(dest string, r io.Reader) error {
gzr, err := gzip.NewReader(r)
if err != nil {
return errors.Wrap(err, "unable to construct gzip reader")
}
parent, pkg := filepath.Split(dest)
if err := os.MkdirAll(parent, 0755); err != nil {
return err
}
tmpdir, err := ioutil.TempDir(parent, "tmp")
if err != nil {
return err
}
defer os.RemoveAll(tmpdir)
tmpdir = filepath.Join(tmpdir, pkg)
if err := untar.Untar(tmpdir, gzr); err != nil {
return err
}
dents, err := ioutil.ReadDir(tmpdir)
if err != nil {
os.RemoveAll(tmpdir)
return errors.Wrap(err, "cannot read download directory")
}
re := regexp.MustCompile(`\w+-\w+-[a-z0-9]+`)
for _, dent := range dents {
if re.MatchString(dent.Name()) {
if err := os.Rename(filepath.Join(tmpdir, dent.Name()), dest); err != nil {
os.RemoveAll(tmpdir)
return errors.Wrap(err, "unable to rename final cache dir")
}
return nil
}
}
os.RemoveAll(tmpdir)
return errors.New("release directory not found in tarball")
}
func fetchRelease(prefix, tag string) (io.ReadCloser, error) {
const format = "https://api.github.com/repos/%s/tarball/%s"
prefix = prefix[len("github.com/"):]
url := fmt.Sprintf(format, prefix, tag)
resp, err := http.Get(url)
if err != nil {
return nil, errors.Wrapf(err, "failed to fetch %q", url)
}
if resp.StatusCode != 200 {
return nil, errors.Errorf("failed to fetch %q: expected 200, got %d", url, resp.StatusCode)
}
return resp.Body, nil
}
func readDepfile(ctx *Context) (map[string]map[string]string, error) {
file := filepath.Join(ctx.Projectdir(), "depfile")
debug.Debugf("loading depfile at %q", file)
return depfile.ParseFile(file)
}
func hash(arg string, args ...string) string {
h := sha1.New()
io.WriteString(h, arg)
for _, arg := range args {
io.WriteString(h, arg)
}
return fmt.Sprintf("%x", string(h.Sum(nil)))
}
func cachePath() string {
return filepath.Join(gbhome(), "cache")
}
func gbhome() string {
return envOr("GB_HOME", filepath.Join(envOr("HOME", "/tmp"), ".gb"))
}
func envOr(key, def string) string {
v := os.Getenv(key)
if v == "" {
v = def
}
return v
}
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