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package cmd
import (
"fmt"
"golang.flu0r1ne.net/zfdiff/snap"
"os"
"io"
)
func Cat(params []string) {
n_params := len(params)
if(n_params == 0) {
die.Fatal("Reference file is required")
}
if(n_params > 3) {
die.Fatal("Too many arguments provided")
}
var reference string
snapish := ""
if(n_params == 1) {
reference = params[0]
} else {
snapish, reference = params[0], params[1]
}
snapRef := snap.ToRelative(snapish)
oracle := snap.GetOracle(reference)
path := oracle.ResolveRelative(snapRef)
file, err := os.Open(path)
if err != nil {
die.Fatal("Could not open snapshot %s\nError: %v", path, err)
}
defer func() {
if err = file.Close(); err != nil {
die.Fatal("Could not close file %s\nError: %v", path, err)
}
}()
buf := make([]byte, 10*1024*1024) //10Ki
for {
n, err := file.Read(buf)
if n > 0 {
fmt.Printf("%s", buf[:n])
}
if err == io.EOF {
break
}
if err != nil {
die.Fatal("Encountered error while reading file: %v", err)
}
}
}
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