bug#43993: parted in script mode still needs "yes/no" as input in "are you sure" questions

Hi,

I wanted to use parted in a script and used the `--script` option.
Unfortunately, I wanted to do something risky (resizing the partition 
that is still mounted -- in my defense: It's only in a virtual machine), 
and then the script will not continue but die with

     Warning: partition /dev/sda2 is being used.  Are you sure
     you want to continue?

The program does not run through and the size is not changed.
Even using something like `yes | parted --script ...` does not fix the 
issue.

This does sound like kind of a bug to me.
I would propose to add something like an `--assume-yes` option, which 
will answer to the messages in some way to make the script continue (or 
only to yes/no questions?).

I took a look at the code, how one could add something like this but I'm 
not fluent in this kind of C programming.  The little thingy I could 
produce was the following patch.

What do you think about the behavior and the proposal?

Cheers,
Michael


```
diff --git a/parted/parted.c b/parted/parted.c
index dbd38d0..58b0621 100644
--- a/parted/parted.c
+++ b/parted/parted.c
@@ -115,6 +115,7 @@ static struct option const options[] = {
          {"list",        0, NULL, 'l'},
          {"machine",     0, NULL, 'm'},
          {"script",      0, NULL, 's'},
+        {"assume-yes",  0, NULL, 'y'},
          {"version",     0, NULL, 'v'},
          {"align",       required_argument, NULL, 'a'},
          {"-pretend-input-tty", 0, NULL, PRETEND_INPUT_TTY},
@@ -126,12 +127,14 @@ static const char *const options_help [][2] = {
          {"list",        N_("lists partition layout on all block 
devices")},
          {"machine",     N_("displays machine parseable output")},
          {"script",      N_("never prompts for user intervention")},
+        {"assume-yes",  N_("Assume yes to all answers (useful in script 
mode)")},
          {"version",     N_("displays the version")},
          {"align=[none|cyl|min|opt]", N_("alignment for new partitions")},
          {NULL,          NULL}
  };

  int     opt_script_mode = 0;
+int     opt_assume_yes = 0;
  int     pretend_input_tty = 0;
  int     opt_machine_mode = 0;
  int     disk_is_modified = 0;
@@ -225,6 +228,14 @@ _partition_warn_busy (PedPartition* part)

          if (ped_partition_is_busy (part)) {
                  path = ped_partition_get_path (part);
+                if (opt_assume_yes)
+                {
+                        printf(_("Partition %s is being used, but "
+                                 "assume-yes mode is on, so we will go 
ahead."),
+                                 path);
+                        free (path);
+                        return 1;
+                }
                  if (ped_exception_throw (
                              PED_EXCEPTION_WARNING,
                              PED_EXCEPTION_YES_NO,
```

-- 
Michael Kopp <[email protected]>