[Bug 1886211] [NEW] Auto-complete for grub-reboot provides invalid options, most of which fail silently

[Ricardo Abreu]

Public bug reported:

Hitting tab on `grub-reboot` gives:

```
$ grub-reboot [tab]
--id
Advanced options for Ubuntu
Ubuntu
Ubuntu, with Linux 4.15.0-108-generic
Ubuntu, with Linux 4.15.0-108-generic (recovery mode)
Ubuntu, with Linux 4.15.0-109-generic
Ubuntu, with Linux 4.15.0-109-generic (recovery mode)
```

But

```
$ grub-reboot --id
Unrecognized option `--id'
[...]
```

And the menu items starting with "Ubuntu, with Linux 4.15.0-" are
actually in the submenu "Advanced options for Ubuntu". So, saying `grub-
reboot "Ubuntu, with Linux 4.15.0-108-generic", does not have the
desired effect. One needs to say instead `grub-reboot "Advanced options
for Ubuntu>Ubuntu, with Linux 4.15.0-108-generic"`.

Additionally, `grub-reboot` accepts those and other meaningless
parameters without complaint:

```
$ sudo grub-reboot nonsense && echo success
success
```

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: grub2-common 2.02-2ubuntu8.15
ProcVersionSignature: User Name 4.15.0-109.110-generic 4.15.18
Uname: Linux 4.15.0-109-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
Date: Fri Jul  3 16:35:28 2020
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic uec-images

** Description changed:

  Hitting tab on `grub-reboot` gives:
  
  ```
  $ grub-reboot [tab]
  --id
  Advanced options for Ubuntu
  Ubuntu
  Ubuntu, with Linux 4.15.0-108-generic
  Ubuntu, with Linux 4.15.0-108-generic (recovery mode)
  Ubuntu, with Linux 4.15.0-109-generic
  Ubuntu, with Linux 4.15.0-109-generic (recovery mode)
  ```
  
  But
  
  ```
  $ grub-reboot --id
  Unrecognized option `--id'
  [...]
  ```
  
  And the menu items starting with "Ubuntu, with Linux 4.15.0-" are
  actually in the submenu "Advanced options for Ubuntu". So, saying `grub-
  reboot "Ubuntu, with Linux 4.15.0-108-generic", does not have the
  desired effect. One needs to say instead `grub-reboot "Advanced options
- for Ubuntu>Ubuntu, with Linux 4.15.0-108-generic".
+ for Ubuntu>Ubuntu, with Linux 4.15.0-108-generic"`.
  
  Additionally, `grub-reboot` accepts those and other meaningless
  parameters without complaint:
  
  ```
  $ sudo grub-reboot nonsense && echo success
  success
  ```
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: grub2-common 2.02-2ubuntu8.15
  ProcVersionSignature: User Name 4.15.0-109.110-generic 4.15.18
  Uname: Linux 4.15.0-109-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  Date: Fri Jul  3 16:35:28 2020
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=C.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=C.UTF-8
+  SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1886211

Title:
  Auto-complete for grub-reboot provides invalid options, most of which
  fail silently

Status in grub2 package in Ubuntu:
  New

Bug description:
  Hitting tab on `grub-reboot` gives:

  ```
  $ grub-reboot [tab]
  --id
  Advanced options for Ubuntu
  Ubuntu
  Ubuntu, with Linux 4.15.0-108-generic
  Ubuntu, with Linux 4.15.0-108-generic (recovery mode)
  Ubuntu, with Linux 4.15.0-109-generic
  Ubuntu, with Linux 4.15.0-109-generic (recovery mode)
  ```

  But

  ```
  $ grub-reboot --id
  Unrecognized option `--id'
  [...]
  ```

  And the menu items starting with "Ubuntu, with Linux 4.15.0-" are
  actually in the submenu "Advanced options for Ubuntu". So, saying
  `grub-reboot "Ubuntu, with Linux 4.15.0-108-generic", does not have
  the desired effect. One needs to say instead `grub-reboot "Advanced
  options for Ubuntu>Ubuntu, with Linux 4.15.0-108-generic"`.

  Additionally, `grub-reboot` accepts those and other meaningless
  parameters without complaint:

  ```
  $ sudo grub-reboot nonsense && echo success
  success
  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: grub2-common 2.02-2ubuntu8.15
  ProcVersionSignature: User Name 4.15.0-109.110-generic 4.15.18
  Uname: Linux 4.15.0-109-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  Date: Fri Jul  3 16:35:28 2020
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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