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174
check.go
174
check.go
@ -15,78 +15,18 @@ import (
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"sync"
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)
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// input contains a file-ish piece of work to perform
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type input struct {
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f io.ReadCloser
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err error
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}
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// checksum contains the path to a file, a way to hash it, and the results of
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// the hash
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type checksum struct {
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filename string
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hash hash.Hash
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checksum string
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err error
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}
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// check is the entry point for -c operation.
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func check(args []string, verbose bool) chan error {
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jobs := make(chan checksum)
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go func() {
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for i := range toInput(args) {
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if i.err != nil {
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jobs <- checksum{err: i.err}
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break
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}
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s := bufio.NewScanner(i.f)
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for s.Scan() {
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jobs <- parseCS(s.Text())
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}
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i.f.Close()
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if s.Err() != nil {
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jobs <- checksum{err: s.Err()}
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}
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}
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close(jobs)
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}()
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results := []<-chan error{}
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for w := 0; w < *ngo; w++ {
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results = append(results, verify(jobs, verbose))
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}
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return merge(results)
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}
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// toInput converts args to a stream of input
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func toInput(args []string) chan input {
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r := make(chan input)
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go func() {
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for _, name := range args {
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f, err := os.Open(name)
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r <- input{f, err}
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}
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if len(args) == 0 {
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r <- input{f: os.Stdin}
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}
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close(r)
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}()
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return r
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}
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// parseCS picks apart a line from a checksum file and returns everything
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// needed to perform a checksum.
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func parseCS(line string) checksum {
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func parseCS(line string) (checksum, error) {
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elems := strings.Fields(line)
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if len(elems) < 1 {
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return checksum{err: fmt.Errorf("couldn't find checksum in %q", line)}
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if len(elems) != 2 {
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return checksum{}, fmt.Errorf("unexpected content: %d != 2", len(elems))
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}
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cs := elems[0]
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cs, f := elems[0], elems[1]
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var hsh hash.Hash
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switch len(cs) {
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case 32:
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@ -98,43 +38,70 @@ func parseCS(line string) checksum {
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case 128:
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hsh = sha512.New()
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default:
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return checksum{err: fmt.Errorf("unknown format: %q", line)}
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return checksum{}, fmt.Errorf("unknown format: %q", line)
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}
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return checksum{filename: strings.TrimSpace(line[len(cs):]), hash: hsh, checksum: cs}
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return checksum{filename: f, hash: hsh, checksum: cs}, nil
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}
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// verify does grunt work of verifying a stream of jobs (filenames).
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func verify(jobs chan checksum, verbose bool) chan error {
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r := make(chan error)
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type input struct {
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f io.ReadCloser
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err error
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}
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type work struct {
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cs checksum
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err error
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}
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func streams(files []string) chan input {
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r := make(chan input)
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go func() {
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for job := range jobs {
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if job.err != nil {
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log.Printf("%+v", job.err)
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continue
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}
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f, err := os.Open(job.filename)
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if err != nil {
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r <- err
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continue
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}
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if _, err := io.Copy(job.hash, f); err != nil {
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r <- err
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continue
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}
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f.Close()
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if fmt.Sprintf("%x", job.hash.Sum(nil)) != job.checksum {
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r <- fmt.Errorf("%s: bad", job.filename)
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} else if verbose {
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fmt.Fprintf(os.Stderr, "ok: %v\n", job.filename)
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for _, name := range files {
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f, err := os.Open(name)
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r <- input{f, err}
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}
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if len(files) == 0 {
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r <- input{f: os.Stdin}
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}
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close(r)
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}()
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return r
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}
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// merge is simple error fan-in
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func check(files []string) chan error {
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jobs := make(chan work)
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go func() {
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for stream := range streams(files) {
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if stream.err != nil {
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jobs <- work{err: stream.err}
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break
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}
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s := bufio.NewScanner(stream.f)
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for s.Scan() {
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cs, err := parseCS(s.Text())
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jobs <- work{cs, err}
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}
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stream.f.Close()
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if s.Err() != nil {
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jobs <- work{err: s.Err()}
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}
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}
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close(jobs)
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}()
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results := []<-chan error{}
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workers := 32
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for w := 0; w < workers; w++ {
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results = append(results, compute(jobs))
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}
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return merge(results)
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}
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func merge(cs []<-chan error) chan error {
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out := make(chan error)
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@ -158,3 +125,30 @@ func merge(cs []<-chan error) chan error {
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}()
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return out
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}
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func compute(jobs chan work) chan error {
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r := make(chan error)
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go func() {
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for job := range jobs {
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if job.err != nil {
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log.Printf("%+v", job.err)
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continue
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}
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f, err := os.Open(job.cs.filename)
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if err != nil {
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r <- fmt.Errorf("open: %v", err)
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continue
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}
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if _, err := io.Copy(job.cs.hash, f); err != nil {
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r <- err
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continue
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}
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f.Close()
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if fmt.Sprintf("%x", job.cs.hash.Sum(nil)) != job.cs.checksum {
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r <- fmt.Errorf("%s: bad", job.cs.filename)
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}
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}
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close(r)
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}()
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return r
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}
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149
hash.go
149
hash.go
@ -1,149 +0,0 @@
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package main
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import (
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"fmt"
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"hash"
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"io"
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"os"
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"sort"
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"sync"
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)
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// result is a message or error payload
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type result struct {
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f string
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cs string
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err error
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}
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// results exists to sort a slice of result
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type results []result
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func (r results) Len() int { return len(r) }
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func (r results) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
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func (r results) Less(i, j int) bool { return r[i].f < r[j].f }
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// hashr exists so that we can make a thing that can return valid hash.Hash
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// interfaces.
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type hashr func() hash.Hash
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// hsh figures out which hash algo to use, and distributes the work of hashing
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func hsh(files []string, verbose bool) chan result {
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var h hashr
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switch *algo {
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case "sha1", "1":
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h = sha1.New
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case "sha256", "256":
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h = sha256.New
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case "sha512", "512":
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h = sha512.New
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case "md5":
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h = md5.New
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default:
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r := make(chan result)
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go func() {
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r <- result{err: fmt.Errorf("unsupported algorithm: %v (supported: md5, sha1, sha256, sha512)", *algo)}
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close(r)
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}()
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return r
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}
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if len(files) == 0 {
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r := make(chan result)
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go func() {
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hsh := h()
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_, err := io.Copy(hsh, os.Stdin)
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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r <- result{cs: fmt.Sprintf("%x", hsh.Sum(nil)), f: "-"}
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close(r)
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}()
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return r
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}
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jobs := make(chan checksum)
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go func() {
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for _, name := range files {
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jobs <- checksum{filename: name}
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}
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close(jobs)
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}()
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res := []<-chan result{}
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for w := 0; w < *ngo; w++ {
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res = append(res, compute(h, jobs, verbose))
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}
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o := make(chan result)
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go func() {
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rs := results{}
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for r := range rmerge(res) {
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rs = append(rs, r)
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}
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sort.Sort(rs)
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for _, r := range rs {
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o <- r
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}
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close(o)
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}()
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return o
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}
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// compute is the checksumming workhorse
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func compute(h hashr, jobs chan checksum, verbose bool) chan result {
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hsh := h()
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r := make(chan result)
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go func() {
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for job := range jobs {
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f, err := os.Open(job.filename)
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if err != nil {
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r <- result{err: err}
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continue
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}
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hsh.Reset()
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_, err = io.Copy(hsh, f)
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f.Close()
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if err != nil {
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r <- result{err: err}
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continue
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}
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if verbose {
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fmt.Fprintf(os.Stderr, "%v\n", job.filename)
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}
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r <- result{f: job.filename, cs: fmt.Sprintf("%x", hsh.Sum(nil))}
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}
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close(r)
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}()
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return r
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}
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// rmerge implements fan-in
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func rmerge(cs []<-chan result) chan result {
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out := make(chan result)
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var wg sync.WaitGroup
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output := func(c <-chan result) {
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for n := range c {
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out <- n
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}
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wg.Done()
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}
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wg.Add(len(cs))
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for _, c := range cs {
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go output(c)
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}
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go func() {
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wg.Wait()
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close(out)
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}()
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return out
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}
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2
license
2
license
@ -1,5 +1,5 @@
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MIT License
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Copyright (c) 2016 derek mcquay, stephen mcquay
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Copyright (c) 2015 smcquay
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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72
main.go
72
main.go
@ -1,42 +1,78 @@
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package main
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import (
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"flag"
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"fmt"
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"io"
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"os"
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"runtime"
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)
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var algo = flag.String("a", "sha256", "algorithm to use")
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var algo = flag.String("a", "sha1", "algorithm to use")
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var mode = flag.Bool("c", false, "check")
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var ngo = flag.Int("n", runtime.NumCPU(), "number of goroutines")
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var verbose = flag.Bool("v", false, "vebose")
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func main() {
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flag.Parse()
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files := flag.Args()
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switch *mode {
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case true:
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ec := 0
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for err := range check(files, *verbose) {
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ec++
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c := 0
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for err := range check(files) {
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c++
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fmt.Fprintf(os.Stderr, "%v\n", err)
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}
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if ec > 0 {
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if c > 0 {
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os.Exit(1)
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}
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case false:
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ec := 0
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for res := range hsh(files, *verbose) {
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if res.err != nil {
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ec++
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fmt.Fprintf(os.Stderr, "%v\n", res.err)
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} else {
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fmt.Printf("%v %v\n", res.cs, res.f)
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}
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}
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if ec > 0 {
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if err := hsh(files); err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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}
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}
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func hsh(files []string) error {
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h := sha256.New()
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switch *algo {
|
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case "sha1", "1":
|
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h = sha1.New()
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case "sha256", "256":
|
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h = sha256.New()
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case "sha512", "512":
|
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h = sha512.New()
|
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case "md5":
|
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h = md5.New()
|
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default:
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return fmt.Errorf("unsupported algorithm: %v", *algo)
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}
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|
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if len(files) == 0 {
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_, err := io.Copy(h, os.Stdin)
|
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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fmt.Printf("%x -\n", h.Sum(nil))
|
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} else {
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for _, name := range files {
|
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f, err := os.Open(name)
|
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if err != nil {
|
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fmt.Fprintf(os.Stderr, "%v\n", err)
|
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continue
|
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}
|
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h.Reset()
|
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_, err = io.Copy(h, f)
|
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f.Close()
|
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if err != nil {
|
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fmt.Fprintf(os.Stderr, "%v\n", err)
|
||||
continue
|
||||
}
|
||||
fmt.Printf("%x %s\n", h.Sum(nil), name)
|
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}
|
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}
|
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return nil
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}
|
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|
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16
readme.md
16
readme.md
@ -1,20 +1,12 @@
|
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# cs
|
||||
|
||||
concurrently calculate/verify checksums (cs)
|
||||
calculate checksums
|
||||
|
||||
It's a simpler version of shasum + md5sum, but concurrently and only with
|
||||
support for md5, sha1, sha256, and sha512.
|
||||
It's a simpler version of shasum + md5sum, but only for md5, sha1, sha256, and
|
||||
sha512.
|
||||
|
||||
## usage
|
||||
|
||||
# create checksums
|
||||
cs -a 256 < foo.txt
|
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cs foo.txt
|
||||
cs -a sha1 foo.txt foo.txt foo.txt > checksums.sha1
|
||||
|
||||
# verify
|
||||
cat checksums.sha1 | cs -c
|
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cs -c checksums.sha1
|
||||
|
||||
# both
|
||||
cs $(find ~/src/mcquay.me | grep '\.go$') | cs -c
|
||||
cs -a sha1 foo.txt foo.txt foo.txt
|
||||
|
||||
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Reference in New Issue
Block a user