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Reading through a tar.gz file in Go / golang
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package main | |
import ( | |
"archive/tar" | |
"compress/gzip" | |
"flag" | |
"fmt" | |
"io" | |
"os" | |
) | |
func main() { | |
// get the arguments from the command line | |
numPtr := flag.Int("n", 4, "an integer") | |
flag.Parse() | |
sourceFile := flag.Arg(0) | |
if sourceFile == "" { | |
fmt.Println("Dude, you didn't pass in a tar file!") | |
os.Exit(1) | |
} | |
fmt.Println("arg 1: ", flag.Arg(0)) | |
processFile(sourceFile, *numPtr) | |
} | |
func processFile(srcFile string, num int) { | |
f, err := os.Open(srcFile) | |
if err != nil { | |
fmt.Println(err) | |
os.Exit(1) | |
} | |
defer f.Close() | |
gzf, err := gzip.NewReader(f) | |
if err != nil { | |
fmt.Println(err) | |
os.Exit(1) | |
} | |
tarReader := tar.NewReader(gzf) | |
i := 0 | |
for { | |
header, err := tarReader.Next() | |
if err == io.EOF { | |
break | |
} | |
if err != nil { | |
fmt.Println(err) | |
os.Exit(1) | |
} | |
name := header.Name | |
switch header.Typeflag { | |
case tar.TypeDir: | |
continue | |
case tar.TypeReg: | |
fmt.Println("(", i, ")", "Name: ", name) | |
if i == num { | |
fmt.Println(" --- ") | |
io.Copy(os.Stdout, tarReader) | |
fmt.Println(" --- ") | |
os.Exit(0) | |
} | |
default: | |
fmt.Printf("%s : %c %s %s\n", | |
"Yikes! Unable to figure out type", | |
header.Typeflag, | |
"in file", | |
name, | |
) | |
} | |
i++ | |
} | |
} |
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