lineageos-ota-server/processFiles.go

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package main
import (
"crypto/sha256"
"fmt"
"io"
"io/fs"
"log"
"os"
"strings"
)
// Searches the build toolchain output directory for new LineageOS builds.
// Any new builds are moved into the public http server directory.
// Returns true if new builds were moved
func moveBuildArtifacts() bool {
f, err := os.Open(buildOutDirectory)
if err != nil {
log.Printf("failed to open ROM directory: %v", err)
return false
}
defer f.Close()
files, err := f.ReadDir(0)
if err != nil {
log.Printf("failed to read files in directory: %v", err)
return false
}
var newROMs bool
for _, v := range files {
if isLineageROM, _ := isLineageROMZip(v); !isLineageROM { // skip files that aren't LineageOS ROMs
continue
}
newROMs = true
log.Printf("new build found - moving file %s", v.Name())
romCache.Lock() // RW lock to prevent multiple concurrent goroutines moving the same file
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err := copyThenDeleteFile(fmt.Sprintf("%s/%s", buildOutDirectory, v.Name()), fmt.Sprintf("%s/%s", romDirectory, v.Name()))
romCache.Unlock()
if err != nil {
log.Printf("failed to move file '%s' from out to rom directory: %v", v.Name(), err)
continue
}
}
return newROMs
}
// Returns a sha256 hash of a file located at the path provided
func hashFile(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", fmt.Errorf("failed to open file '%s': %v: ", filename, err)
}
defer f.Close()
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
return "", fmt.Errorf("failed to copy data from file to hash function: %v", err)
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}
// false if a file is not a LineageOS ROM .zip file
// no formal validation is performed - only file naming convention is checked
// also returns a lineage ROM's filename sliced and delimited by -'s
// Example filename: lineage-20.0-20230604-UNOFFICIAL-sunfish.zip
func isLineageROMZip(v fs.DirEntry) (bool, []string) {
// skip directories, non .zip files and files that don't begin with lineage-
if v.Type().IsDir() || !strings.HasSuffix(v.Name(), ".zip") || !strings.HasPrefix(v.Name(), "lineage-") {
return false, nil
}
splitName := strings.Split(v.Name(), "-")
// expect 5 dashes
return len(splitName) == 5, splitName
}
// A custom "move file" function because in docker container the mounted folders are different overlay filesystems
// Instead of os.Rename, we must copy and delete
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func copyThenDeleteFile(src, dst string) error {
sourceFileStat, err := os.Stat(src)
if err != nil {
return err
}
if !sourceFileStat.Mode().IsRegular() {
return fmt.Errorf("%s is not a regular file", src)
}
source, err := os.Open(src)
if err != nil {
return err
}
defer source.Close()
destination, err := os.Create(dst)
if err != nil {
return err
}
defer destination.Close()
_, err = io.Copy(destination, source)
if err != nil {
return fmt.Errorf("failed to copy file: %v", err)
}
err = os.Remove(src)
if err != nil {
return fmt.Errorf("failed to delete source file after copy: %v", err)
}
return nil
}