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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"sync"
"github.com/jreisinger/ghrel/asset"
"github.com/jreisinger/ghrel/checksum"
)
var (
l = flag.Bool("l", false, "just list assets, don't download them")
p = flag.String("p", "", "assets matching shell `pattern` (doesn't apply to checksum files)")
v = flag.Bool("v", false, "be verbose")
)
func main() {
flag.Usage = func() {
desc := "Download and verify assets (files) of the latest release from a GitHub repository."
fmt.Fprintf(flag.CommandLine.Output(), "%s\n\n%s [flags] <owner>/<repo>\n", desc, os.Args[0])
flag.PrintDefaults()
}
// Parse CLI arguments.
flag.Parse()
if len(flag.Args()) != 1 {
flag.Usage()
os.Exit(1)
}
repo := flag.Args()[0]
// Set CLI-style logging.
log.SetFlags(0)
log.SetPrefix(os.Args[0] + ": ")
assets, err := asset.Get(repo, p)
if err != nil {
log.Fatalf("get release assets: %v", err)
}
if *l {
if *v {
asset.Table(assets)
} else {
for _, a := range assets {
fmt.Println(a.Name)
}
}
os.Exit(0)
}
// Download and checksum assets.
var wg sync.WaitGroup
for i := range assets {
wg.Add(1)
go func(i int) {
defer wg.Done()
if err := asset.Download(assets[i]); err != nil {
log.Printf("download asset %v", err)
return
}
sum, err := checksum.Sha256(assets[i].Name)
if err != nil {
log.Printf("checksum asset: %v", err)
return
}
assets[i].Checksum = sum
}(i)
}
wg.Wait()
// Print download statistics.
if *v {
nFiles, nCheckumsFiles := asset.Count(assets)
fmt.Printf("downloaded\t%d + %d checksum file(s)\n", nFiles, nCheckumsFiles)
}
var pairs []checksum.Pair
// Get checksum/filename pairs from assets that are checksum files.
for _, a := range assets {
if !a.IsChecksumFile {
continue
}
cs, err := checksum.Parse(a.Name)
if err != nil {
log.Printf("get checksums from %s: %v", a.Name, err)
continue
}
pairs = append(pairs, cs...)
}
// Verify checksums.
var verifiedFiles int
Asset:
for _, a := range assets {
if a.IsChecksumFile {
continue
}
for _, c := range pairs {
if a.Name == c.Filename {
if a.Checksum == c.Checksum {
verifiedFiles++
} else {
log.Printf("%s not verified, has bad checksum %s", a.Name, c.Checksum)
}
continue Asset
}
}
log.Printf("%s not verified, has no checksum", a.Name)
}
if *v {
fmt.Printf("verified\t%d\n", verifiedFiles)
}
}