4c850e7165
tarsum is not actually used by the registry. Remove support for it. Convert numerous uses in unit tests to SHA256. Update docs to remove mentions of tarsums (which were often inaccurate). Remove tarsum dependency. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
98 lines
1.7 KiB
Go
98 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/digest"
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"github.com/docker/distribution/version"
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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.Fprintf(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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