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impl.go
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impl.go
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package packageutil
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"sort"
"strconv"
"strings"
"github.com/Cloud-Foundations/Dominator/lib/image"
)
func getPackageList(packager func(cmd string, w io.Writer) error) (
[]image.Package, error) {
output := new(bytes.Buffer)
if err := packager("show-size-multiplier", output); err != nil {
return nil, fmt.Errorf("error getting size multiplier: %s", err)
}
sizeMultiplier := uint64(1)
nScanned, err := fmt.Fscanf(output, "%d", &sizeMultiplier)
if err != nil {
if err != io.EOF {
return nil, fmt.Errorf(
"error decoding size multiplier: %s", err)
}
} else if nScanned != 1 {
return nil, errors.New("malformed size multiplier")
}
output.Reset()
if err := packager("list", output); err != nil {
return nil, fmt.Errorf("error running package lister: %s", err)
}
packageMap := make(map[string]image.Package)
scanner := bufio.NewScanner(output)
for scanner.Scan() {
line := scanner.Text()
fields := strings.Fields(line)
if len(fields) < 2 {
return nil, fmt.Errorf("malformed line: %s", line)
}
name := fields[0]
version := fields[1]
pkg := image.Package{
Name: name,
Version: version,
}
if len(fields) > 2 {
if size, err := strconv.ParseUint(fields[2], 10, 64); err != nil {
return nil, fmt.Errorf("malformed size: %s", fields[2])
} else {
pkg.Size = size * sizeMultiplier
}
}
packageMap[name] = pkg
}
if err := scanner.Err(); err != nil {
if err != io.EOF {
fmt.Fprintln(os.Stderr, "reading standard input:", err)
}
}
packageNames := make([]string, 0, len(packageMap))
for name := range packageMap {
packageNames = append(packageNames, name)
}
sort.Strings(packageNames)
var packages []image.Package
for _, name := range packageNames {
packages = append(packages, packageMap[name])
}
return packages, nil
}