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test-repo.go
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test-repo.go
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// Utility to create a backup repository allowing to test pruning against
package main
import (
"fmt"
"os"
"path"
"strings"
"time"
"github.com/itchyny/timefmt-go"
flag "github.com/spf13/pflag"
)
const DateRangeSeperator = "..."
const PatternAlmostISO8601WithZuluTime = "%Y-%m-%dT%H-%M-%SZ"
// CLI arguments date patterns (used to parse input)
const (
ArgumentDatePatternISO8601DateOnly = "2006-01-02" // "%Y-%m-%d"
ArgumentDatePatternISO8601DateAndTime = "2006-01-02T15:04:05Z0700" // "%Y-%m-%dT%H:%M:%S%z"
)
type ArgParseError struct {
Position int
Value string
InnerError error
}
func (e *ArgParseError) Error() string {
return fmt.Sprintf("Invalid argument #%d '%v': %v", e.Position, e.Value, e.InnerError)
}
func (e *ArgParseError) Unwrap() error { return e.InnerError }
type configuration struct {
BaseDirectory string
DateRanges []dateRange
Pattern string
}
func run(config configuration) error {
if err := os.RemoveAll(config.BaseDirectory); err != nil {
return err
}
if err := os.MkdirAll(config.BaseDirectory, os.ModePerm); err != nil {
return err
}
for _, v := range config.DateRanges {
for date := v.From; !date.After(v.To); date = date.AddDate(0, 0, 1) {
directoryName := timefmt.Format(date, config.Pattern)
directoryPath := path.Join(config.BaseDirectory, directoryName)
// Create directory
if err := os.Mkdir(directoryPath, os.ModePerm); err != nil {
return err
}
// Create test files inside directory
files := []string{
"backup-" + timefmt.Format(date, PatternAlmostISO8601WithZuluTime) + ".tar.gz",
"backup-" + timefmt.Format(date, PatternAlmostISO8601WithZuluTime) + ".tar.gz.sha256sum",
}
for _, v := range files {
err := os.WriteFile(path.Join(directoryPath, v), []byte(v), 0644)
if err != nil {
return err
}
}
}
}
return nil
}
func parseDateString(s string) (time.Time, error) {
var date time.Time
var err error
// Try to parse as date only format
date, err = time.Parse(ArgumentDatePatternISO8601DateOnly, s)
// If error, try to parse as date time format
if err != nil {
date, err = time.Parse(ArgumentDatePatternISO8601DateAndTime, s)
}
// If error, give up
if err != nil {
return time.Time{}, err
}
return date, nil
}
func parseDateRanges(args []string) ([]dateRange, error) {
dateRanges := []dateRange{}
for i, v := range args {
if strings.Contains(v, DateRangeSeperator) {
dates := strings.Split(v, DateRangeSeperator)
if len(dates) != 2 {
return nil, &ArgParseError{Position: i, Value: v}
}
from, err := parseDateString(dates[0])
if err != nil {
return nil, &ArgParseError{Position: i, Value: v, InnerError: err}
}
to, err := parseDateString(dates[1])
if err != nil {
return nil, &ArgParseError{Position: i, Value: v, InnerError: err}
}
dateRanges = append(dateRanges, dateRange{From: from, To: to})
} else {
date, err := parseDateString(v)
if err != nil {
return nil, &ArgParseError{Position: i, Value: v, InnerError: err}
}
dateRanges = append(dateRanges, dateRange{From: date, To: date})
}
}
return dateRanges, nil
}
type dateRange struct {
From time.Time
To time.Time
}
var pattern string
func init() {
flag.StringVarP(&pattern, "pattern", "p", PatternAlmostISO8601WithZuluTime, "strptime pattern used to parse the date from the name of the timestamped directory")
}
func main() {
config := configuration{}
// Parse flags
flag.Parse()
config.Pattern = pattern
// Parse args
args := flag.Args()
if len(args) < 2 {
fmt.Printf("Invalid number of arguments: provide at least two arguments")
os.Exit(2)
}
// Argument #1: directory
config.BaseDirectory = args[0]
// Arguments #2-#n: date (date ranges)
dateRanges, err := parseDateRanges(args[1:])
if err != nil {
fmt.Println(err)
os.Exit(2)
}
config.DateRanges = dateRanges
// Run
if err := run(config); err != nil {
fmt.Printf("Shit hit the fan: %s", err)
os.Exit(1)
}
}