1d33874951
Go 1.13 and up enforce import paths to be versioned if a project contains a go.mod and has released v2 or up. The current v2.x branches (and releases) do not yet have a go.mod, and therefore are still allowed to be imported with a non-versioned import path (go modules add a `+incompatible` annotation in that case). However, now that this project has a `go.mod` file, incompatible import paths will not be accepted by go modules, and attempting to use code from this repository will fail. This patch uses `v3` for the import-paths (not `v2`), because changing import paths itself is a breaking change, which means that the next release should increment the "major" version to comply with SemVer (as go modules dictate). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
100 lines
1.7 KiB
Go
100 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/distribution/distribution/v3/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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