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@ -2,6 +2,7 @@ |
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package main |
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import ( |
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"flag" |
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"fmt" |
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"io" |
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"os" |
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@ -15,33 +16,56 @@ var Version = "unknown" |
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var VersionHash = "unknown" |
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const _usage = `Usage: |
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%s <infile> <outfile> |
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%s [OPTION]... <infile> <outfile> |
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Flatten a Docker container image to a root file system. |
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Arguments: |
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<infile>: Input Docker container. Tarball. |
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<outfile>: Output tarball, the root file system. '-' is stdout. |
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<infile> Input Docker container. Tarball. |
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<outfile> Output tarball, the root file system. '-' is stdout. |
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Options: |
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--prefix=<prefix> prefix all destination files with a given string. |
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undocker %s (%s) |
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Built with %s |
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` |
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func usage(pre string, out io.Writer) { |
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fmt.Fprintf(out, pre+_usage, |
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filepath.Base(os.Args[0]), |
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Version, |
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VersionHash, |
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runtime.Version(), |
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) |
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} |
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func usageErr(pre string) { |
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usage(pre, os.Stderr) |
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os.Exit(2) |
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} |
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func main() { |
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runtime.GOMAXPROCS(1) // no need to create that many threads
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if len(os.Args) != 3 { |
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fmt.Fprintf(os.Stderr, _usage, |
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filepath.Base(os.Args[0]), |
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Version, |
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VersionHash, |
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runtime.Version(), |
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) |
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os.Exit(1) |
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var filePrefix string |
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fs := flag.NewFlagSet("undocker", flag.ExitOnError) |
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fs.Usage = func() { usageErr("") } |
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fs.StringVar(&filePrefix, "prefix", "", "prefix files in the tarball") |
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if len(os.Args) == 1 { |
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usageErr("") |
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} |
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_ = fs.Parse(os.Args[1:]) // ExitOnError captures it
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args := fs.Args() |
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if len(args) != 2 { |
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usageErr("invalid number of arguments\n") |
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} |
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c := &command{flattener: rootfs.Flatten, Stdout: os.Stdout} |
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if err := c.execute(os.Args[1], os.Args[2]); err != nil { |
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if err := c.execute(args[0], args[1], filePrefix); err != nil { |
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fmt.Printf("Error: %v\n", err) |
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os.Exit(1) |
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} |
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@ -49,11 +73,11 @@ func main() { |
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} |
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type command struct { |
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flattener func(io.ReadSeeker, io.Writer) error |
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flattener func(io.ReadSeeker, io.Writer, ...rootfs.Option) error |
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Stdout io.Writer |
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} |
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func (c *command) execute(infile string, outfile string) (_err error) { |
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func (c *command) execute(infile, outfile, filePrefix string) (_err error) { |
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rd, err := os.Open(infile) |
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if err != nil { |
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return err |
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@ -84,5 +108,5 @@ func (c *command) execute(infile string, outfile string) (_err error) { |
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out = outf |
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} |
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return c.flattener(rd, out) |
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return c.flattener(rd, out, rootfs.WithFilePrefix(filePrefix)) |
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} |
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