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/* Copyright (C) 2021 Nicolas Peugnet <n.peugnet@free.fr>
This file is part of dna-backup.
dna-backup is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
dna-backup is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with dna-backup. If not, see <https://www.gnu.org/licenses/>. */
package main
import (
"flag"
"fmt"
"os"
"github.com/n-peugnet/dna-backup/logger"
"github.com/n-peugnet/dna-backup/repo"
)
type command struct {
Flag *flag.FlagSet
Run func([]string) error
Usage string
Help string
}
const (
name = "dna-backup"
baseUsage = "<command> [<options>] [--] <args>"
)
var (
logLevel int
chunkSize int
format string
)
var commit = command{flag.NewFlagSet("commit", flag.ExitOnError), commitMain,
"[<options>] [--] <source> <dest>",
"Create a new version of folder <source> into repo <dest>",
}
var restore = command{flag.NewFlagSet("restore", flag.ExitOnError), restoreMain,
"[<options>] [--] <source> <dest>",
"Restore the last version from repo <source> into folder <dest>",
}
var subcommands = map[string]command{
commit.Flag.Name(): commit,
restore.Flag.Name(): restore,
}
func init() {
// init default help message
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "usage: %s %s\n\ncommands:\n", name, baseUsage)
for _, s := range subcommands {
fmt.Printf(" %s %s\n", s.Flag.Name(), s.Help)
}
os.Exit(1)
}
// setup subcommands
for _, s := range subcommands {
s.Flag.IntVar(&logLevel, "v", 3, "log verbosity level (0-4)")
s.Flag.IntVar(&chunkSize, "c", 8<<10, "chunk size")
}
}
func main() {
flag.Parse()
args := flag.Args()
if len(args) < 1 {
flag.Usage()
}
cmd, exists := subcommands[args[0]]
if !exists {
fmt.Fprintf(flag.CommandLine.Output(), "error: unknown command %s\n\n", args[0])
flag.Usage()
}
cmd.Flag.Usage = func() {
fmt.Fprintf(cmd.Flag.Output(), "usage: %s %s %s\n\noptions:\n", name, cmd.Flag.Name(), cmd.Usage)
cmd.Flag.PrintDefaults()
os.Exit(1)
}
cmd.Flag.Parse(args[1:])
logger.Init(logLevel)
if err := cmd.Run(cmd.Flag.Args()); err != nil {
fmt.Fprintf(cmd.Flag.Output(), "error: %s\n\n", err)
cmd.Flag.Usage()
}
}
func commitMain(args []string) error {
if len(args) != 2 {
return fmt.Errorf("wrong number of args")
}
source := args[0]
dest := args[1]
repo := repo.NewRepo(dest, chunkSize)
repo.Commit(source)
return nil
}
func restoreMain(args []string) error {
if len(args) != 2 {
return fmt.Errorf("wrong number args")
}
source := args[0]
dest := args[1]
repo := repo.NewRepo(source, chunkSize)
repo.Restore(dest)
return nil
}
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