d66208108d
the digest cli does not work if we do not import this two packages, tested in go1.9. basically, we have to make several algorithms to be available by calling crypto.RegisterHash in init functions. Signed-off-by: zhouhaibing089 <zhouhaibing089@gmail.com>
101 lines
1.7 KiB
Go
101 lines
1.7 KiB
Go
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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"log"
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"os"
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"github.com/docker/distribution/version"
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"github.com/opencontainers/go-digest"
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_ "crypto/sha256"
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_ "crypto/sha512"
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)
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var (
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algorithm = digest.Canonical
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showVersion bool
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)
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type job struct {
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name string
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reader io.Reader
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}
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func init() {
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flag.Var(&algorithm, "a", "select the digest algorithm (shorthand)")
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flag.Var(&algorithm, "algorithm", "select the digest algorithm")
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flag.BoolVar(&showVersion, "version", false, "show the version and exit")
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log.SetFlags(0)
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log.SetPrefix(os.Args[0] + ": ")
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}
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func usage() {
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fmt.Fprintf(os.Stderr, "usage: %s [files...]\n", os.Args[0])
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fmt.Fprint(os.Stderr, `
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Calculate the digest of one or more input files, emitting the result
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to standard out. If no files are provided, the digest of stdin will
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be calculated.
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`)
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flag.PrintDefaults()
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}
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func unsupported() {
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log.Fatalf("unsupported digest algorithm: %v", algorithm)
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}
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func main() {
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var jobs []job
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flag.Usage = usage
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flag.Parse()
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if showVersion {
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version.PrintVersion()
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return
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}
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var fail bool // if we fail on one item, foul the exit code
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if flag.NArg() > 0 {
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for _, path := range flag.Args() {
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fp, err := os.Open(path)
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if err != nil {
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log.Printf("%s: %v", path, err)
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fail = true
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continue
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}
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defer fp.Close()
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jobs = append(jobs, job{name: path, reader: fp})
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}
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} else {
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// just read stdin
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jobs = append(jobs, job{name: "-", reader: os.Stdin})
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}
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digestFn := algorithm.FromReader
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if !algorithm.Available() {
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unsupported()
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}
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for _, job := range jobs {
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dgst, err := digestFn(job.reader)
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if err != nil {
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log.Printf("%s: %v", job.name, err)
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fail = true
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continue
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}
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fmt.Printf("%v\t%s\n", dgst, job.name)
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}
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if fail {
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os.Exit(1)
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}
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}
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