[Bug 1799475] [NEW] no error message from sha1sum -c if given a different checksum

[David Pottage]

Public bug reported:

I made a mistake when invoking sha1sum -c where I accidentally passed in
a sha256 checksum. It did not report any error message to me instead it
waited for input without alerting me to the problem.

Steps to reproduce:

Run "sha1sum -c" without any additional args in a terminal window. (So
it reads checksums and filenames from stdin).

Paste into the terminal a valid SHA256 checksum and a filename that is
present.

expected: Error message "sha1sum: 'standard input': no properly
formatted SHA1 checksum lines found"

actual: No output.

Seen in Ubuntu 18.04

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1799475

Title:
  no error message from sha1sum -c if given a different checksum

Status in coreutils package in Ubuntu:
  New

Bug description:
  I made a mistake when invoking sha1sum -c where I accidentally passed
  in a sha256 checksum. It did not report any error message to me
  instead it waited for input without alerting me to the problem.

  Steps to reproduce:

  Run "sha1sum -c" without any additional args in a terminal window. (So
  it reads checksums and filenames from stdin).

  Paste into the terminal a valid SHA256 checksum and a filename that is
  present.

  expected: Error message "sha1sum: 'standard input': no properly
  formatted SHA1 checksum lines found"

  actual: No output.

  Seen in Ubuntu 18.04

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