[Bug 1935043] [NEW] sshpass does not report file not found with -v -f, instead hangs

[Tgkprog]

Public bug reported:

Using sshpass to send a password to ssh-add

When I use a valid file path and give command :

I get the expected output
SSHPASS searching for password prompt using match "pass"
SSHPASS read: Enter passphrase for /home/tushar/.ssh/t/tgkprogOct2020: 
SSHPASS detected prompt. Sending password.
SSHPASS read: 

Identity added: /home/tushar/.ssh/t/tgkprogOct2020 (Tushar G Kapila
<tgkprog at gmail.com> tgkprog  in github, stackoverflow, twitter, fb and
other places)

But when I use :

sshpass -v -f /home/tushar/work/pwdPathDoesNotExist  -P "pass"  ssh-add
~/.ssh/t/tgkprogOct2020

Where I have mistakenly put an incorrect path or file name, it does not
report that the file does not exist, should do that first, instead if
continues with issuing the command, looks for the text marker per -P and
then tries to give it the password, and then hangs, as I guess there is
no password to give and ssh-add keeps waiting. No error or warning
emited.

Output:
SSHPASS searching for password prompt using match "pass"
SSHPASS read: Enter passphrase for /home/tushar/.ssh/t/tgkprogOct2020: 
SSHPASS detected prompt. Sending password.

* After this command does not complete, hangs here

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

** Attachment added: "Terminal screen with commands & output as described in bug description"
   https://bugs.launchpad.net/bugs/1935043/+attachment/5509903/+files/Screenshot%20from%202021-07-08%2018-47-47.png

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https://bugs.launchpad.net/bugs/1935043

Title:
  sshpass does not report file not found with -v -f, instead hangs

Status in apt package in Ubuntu:
  New

Bug description:
  Using sshpass to send a password to ssh-add

  When I use a valid file path and give command :

  I get the expected output
  SSHPASS searching for password prompt using match "pass"
  SSHPASS read: Enter passphrase for /home/tushar/.ssh/t/tgkprogOct2020: 
  SSHPASS detected prompt. Sending password.
  SSHPASS read: 

  Identity added: /home/tushar/.ssh/t/tgkprogOct2020 (Tushar G Kapila
  <tgkprog at gmail.com> tgkprog  in github, stackoverflow, twitter, fb and
  other places)

  But when I use :

  sshpass -v -f /home/tushar/work/pwdPathDoesNotExist  -P "pass"  ssh-
  add ~/.ssh/t/tgkprogOct2020

  Where I have mistakenly put an incorrect path or file name, it does
  not report that the file does not exist, should do that first, instead
  if continues with issuing the command, looks for the text marker per
  -P and then tries to give it the password, and then hangs, as I guess
  there is no password to give and ssh-add keeps waiting. No error or
  warning emited.

  Output:
  SSHPASS searching for password prompt using match "pass"
  SSHPASS read: Enter passphrase for /home/tushar/.ssh/t/tgkprogOct2020: 
  SSHPASS detected prompt. Sending password.

  * After this command does not complete, hangs here

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