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builder/symlink: Factor out into separate functions to make indents more readable

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Implement suggestion from https://github.com/NixOS/nixpkgs/pull/188272#discussion_r958608686.
This commit is contained in:
adisbladis 2022-09-02 15:58:49 +12:00
parent fc2d392494
commit 9b360feaf2
1 changed files with 59 additions and 52 deletions
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111
builder/symlink/symlink.go
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@ -15,33 +15,33 @@ type Package struct {
ReplacedPath string `json:"replaced,omitempty"`
}
type Sources map[string]string
func populateStruct(path string, data interface{}) {
pathVal := os.Getenv(path)
if len(path) == 0 {
panic(fmt.Sprintf("env var '%s' was unset", path))
}
path = pathVal
b, err := os.ReadFile(path)
if err != nil {
panic(err)
}
err = json.Unmarshal(b, &data)
if err != nil {
panic(err)
}
}
func main() {
sources := make(map[string]string)
sources := make(Sources)
pkgs := make(map[string]*Package)
{
b, err := os.ReadFile(os.Getenv("sourcesPath"))
if err != nil {
panic(err)
}
populateStruct("sourcesPath", &sources)
err = json.Unmarshal(b, &sources)
if err != nil {
panic(err)
}
}
{
b, err := os.ReadFile(os.Getenv("jsonPath"))
if err != nil {
panic(err)
}
err = json.Unmarshal(b, &pkgs)
if err != nil {
panic(err)
}
}
populateStruct("jsonPath", &pkgs)
keys := make([]string, 0, len(pkgs))
for key := range pkgs {
@ -49,6 +49,10 @@ func main() {
}
sort.Strings(keys)
makeSymlinks(keys, sources)
}
func makeSymlinks(keys []string, sources Sources) {
// Iterate, in reverse order
for i := len(keys) - 1; i >= 0; i-- {
key := keys[i]
@ -57,46 +61,49 @@ func main() {
paths := []string{key}
for _, path := range paths {
vendorDir := filepath.Join("vendor", filepath.Dir(path))
if err := os.MkdirAll(vendorDir, 0755); err != nil {
if err := os.MkdirAll(vendorDir, 0o755); err != nil {
panic(err)
}
if _, err := os.Stat(filepath.Join("vendor", path)); err == nil {
files, err := os.ReadDir(src)
if err != nil {
panic(err)
}
for _, f := range files {
innerSrc := filepath.Join(src, f.Name())
dst := filepath.Join("vendor", path, f.Name())
if err := os.Symlink(innerSrc, dst); err != nil {
// assume it's an existing directory, try to link the directory content instead.
// TODO should we do this recursively
files, err := os.ReadDir(innerSrc)
if err != nil {
panic(err)
}
for _, f := range files {
if err := os.Symlink(filepath.Join(innerSrc, f.Name()), filepath.Join(dst, f.Name())); err != nil {
fmt.Println("ignore symlink error", filepath.Join(innerSrc, f.Name()), filepath.Join(dst, f.Name()))
}
}
}
}
vendorPath := filepath.Join("vendor", path)
if _, err := os.Stat(vendorPath); err == nil {
populateVendorPath(vendorPath, src)
continue
}
// If the file doesn't already exist, just create a simple symlink
err := os.Symlink(src, filepath.Join("vendor", path))
err := os.Symlink(src, vendorPath)
if err != nil {
panic(err)
}
}
}
}
func populateVendorPath(vendorPath string, src string) {
files, err := os.ReadDir(src)
if err != nil {
panic(err)
}
for _, f := range files {
innerSrc := filepath.Join(src, f.Name())
dst := filepath.Join(vendorPath, f.Name())
if err := os.Symlink(innerSrc, dst); err != nil {
// assume it's an existing directory, try to link the directory content instead.
// TODO should we do this recursively?
files, err := os.ReadDir(innerSrc)
if err != nil {
panic(err)
}
for _, f := range files {
srcFile := filepath.Join(innerSrc, f.Name())
dstFile := filepath.Join(dst, f.Name())
if err := os.Symlink(srcFile, dstFile); err != nil {
fmt.Println("ignoring symlink error", srcFile, dstFile)
}
}
}
}
}