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plymouth interview questions

Top plymouth frequently asked interview questions

How do I run a custom animated bootscreen?

I want to create a new splash theme for Ubuntu 11.10 using a volcano theme, so when it boots the volcano erupts with lava (same for shutdown). Now I have my image (png) but obviously it does not animate. I looked at the solar plymouth theme and I was thinking since the animation is there I can check it but no luck.

Is there a tool or a script I need to use to animate my volcano?

The image looks like this:

volcanotheme

I've already got the animated image, I'm just wondering how I can make it run at startup.


Source: (StackOverflow)

How can I disable the purple splash screen at boot?

How can I disable the purple "Ubuntu" splash screen that displays at boot before the login screen has loaded? I'd prefer to just see plain text scroll by.


Source: (StackOverflow)

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Whats is the importance of Plymouth?

I accidentaly did a command to delete Plymouth from my ubuntu 15.04:

sudo apt-get remove plymouth

and after this my login screen didn't appear any more. After GRUB menu the screen became black and nothing seems to happen. I installed Ubuntu again but the question remains on my mind: What is Plymouth and why it crashed my system?


Source: (StackOverflow)

How can I change the purple background color of Ubuntu plymouth boot screen?

I'd like to change the background color of the purple plymouth boot splash to another color, how can I do this?


Source: (StackOverflow)

How to fix plymouth (splash screen) in all Ubuntu releases!

How to fix black or broken plymouth (splash screen) after installation of nvidia proprietary drivers in Ubuntu (it happens usually in all Ubuntu releases)? It's no matter what version of nvidia drivers I install bug is always present.


Source: (StackOverflow)

Boot screen in low graphics/text mode

My ubuntu boot screen shows up in a strange low resolution, almost text mode, instead the usual and sleek white "ubuntu" over dark background. It's not a big issue because when GDM loads everything becomes ok, but If there's an easy way to fix it I would like to give it a try.


Source: (StackOverflow)

How To Get Plymouth To Display Boot Messages When Booting?

I would like to know how to create a splash for Ubuntu Maverick with boot messages being displayed when I boot as well as a progress bar and a spinning logo.

Or, if possible, how to edit a splash which already has a spinning logo and a progress bar, and add boot messages to it.

This is the theme I would like to edit:

and I would like something like this:

enter image description here

or this, which is the exact splash I want to create:

enter image description here


i was able to find this website it has a lot of usefull information but am havin a hard time understanding some of it. havent done any scripting before!

Create your own splash screen with scrolling boot messages

Plymouth Scripting

and this is another website wich can help with scripting

this is the script for the progress bar in the splash:

    #----------------------------------------- Progress Bar --------------------------------

    progress_box.image = Image("progress_box.png");
    progress_box.sprite = Sprite(progress_box.image);

    progress_box.x = Window.GetX() + Window.GetWidth() / 2 - progress_box.image.GetWidth() / 2;
    progress_box.y = Window.GetY() + Window.GetHeight() * 0.65 - progress_box.image.GetHeight() / 2;
    progress_box.sprite.SetPosition(progress_box.x, progress_box.y, 0);

    progress_bar.original_image = Image("progress_bar.png");
    progress_bar.sprite = Sprite();

    progress_bar.x = Window.GetX() + Window.GetWidth()  / 2 -        progress_bar.original_image.GetWidth() / 2;
    progress_bar.y = Window.GetY() + Window.GetHeight() * 0.65  - progress_box.image.GetHeight() / 2 + (progress_box.image.GetHeight() - progress_bar.original_image.GetHeight()) / 2;
    progress_bar.sprite.SetPosition(progress_bar.x, progress_bar.y, 1);

    fun progress_callback (duration, progress)
      {
        if (progress_bar.image.GetWidth () != Math.Int (progress_bar.original_image.GetWidth () * progress))
          {
# add the * 3 to multiply the speed of the progress bar by 3
            progress_bar.image = progress_bar.original_image.Scale(progress_bar.original_image.GetWidth(progress_bar.original_image) * progress * 3, progress_bar.original_image.GetHeight());
            progress_bar.sprite.SetImage (progress_bar.image);
          }
      }

    Plymouth.SetBootProgressFunction(progress_callback);

OK so I did a lot more searching and I was able to learn a bit more about Plymouth.

these are the sites that I found useful. Plymouth theming guide There are four parts to that article you have to read through them to get the gist of what we are doing. (I was comparing their script with the script for my splash to understand what is what, I recommend doing that if anyone is to follow in my footsteps.) Plymouth scripting Ok this link has 2 pages had to go through them to understand what to do. Turns out they were after the same thing I was, which is to direct boot messages to the Plymouth splash where i already have a spinning logo, background, progress bar.

So i had to edit my /lib/lsb/init-functions file and make it so that it would send the boot error/success,etc messages to Plymouth by adding this paragraph

# SEND MESSAGES TO PLYMOUTH
if [ -x /bin/plymouth ] && pidof plymouthd >/dev/null
then
    plymouth_send() {
        [ "$1" = '-n' ] && { # add a flag '>' for lines that will be extended
            shift
            /bin/plymouth message --text=">$*" || true
            return
        }
        [ "$1" = '-w' ] && { # add "warning" formatting
            shift
            /bin/plymouth update --status="warning" || true
            /bin/plymouth message --text="$*" || true
            /bin/plymouth update --status="normal" || true
            return
        }
        [ "$1" = '-f' ] && { # add "failed" formatting
            shift
            /bin/plymouth update --status="failed" || true
            /bin/plymouth message --text="$*" || true
            /bin/plymouth update --status="normal" || true
            return
        }
        /bin/plymouth message --text="$*" || true
    }
else
    plymouth_send() { :; }
fi

# int log_begin_message (char *message)
log_begin_msg () {
    if [ -z "${1:-}" ]; then
        return 1
    fi
    echo -n "$@"
}

As well as adding

   # Only do the fancy stuff if we have an appropriate terminal
    # and if /usr is already mounted
    if log_use_fancy_output; then
        RED=`$TPUT setaf 1`
        YELLOW=`$TPUT setaf 3`
        NORMAL=`$TPUT op`
    else
        RED=''
        YELLOW=''
        NORMAL=''
    fi

    if [ $1 -eq 0 ]; then
        echo "."
        plymouth_send "."
    elif [ $1 -eq 255 ]; then
        /bin/echo -e " ${YELLOW}(warning).${NORMAL}"
        plymouth_send -w " (warning)."
    else
        /bin/echo -e " ${RED}failed!${NORMAL}"
        plymouth_send -f " failed!"
    fi
    log_end_msg_post "$@"
    return $retval
}

log_action_msg () {
    echo "$@."
    plymouth_send "$@."
}

log_action_begin_msg () {
    echo -n "$@..."
    plymouth_send -n "$@..."
}

log_action_cont_msg () {
    echo -n "$@..."
    plymouth_send -n "$@..."
}

log_action_end_msg () {
    log_action_end_msg_pre "$@"
    if [ -z "${2:-}" ]; then
        end="."
    else
        end=" ($2)."
    fi

    if [ $1 -eq 0 ]; then
        echo "done${end}"
        plymouth_send "done${end}"
    else
        if log_use_fancy_output; then
            RED=`$TPUT setaf 1`
            NORMAL=`$TPUT op`
            /bin/echo -e "${RED}failed${end}${NORMAL}"
        else
            echo "failed${end}"
            plymouth_send -f "failed${end}"
        fi
    fi
    log_action_end_msg_post "$@"
}

So far I wasn't able to get the messages through to Plymouth, but I did get a better understanding of how Plymouth scripting works!

I don't know what else am supposed to do to make it work! hoping somebody here can help me out

Ohh and here is my version of the script for the Splash I am working on.

# INT2MIL-Ubuntu-10.10-Eng splashy like theme

Window.GetMaxWidth = fun (){
  i = 0;
  width = 0;
  while (Window.GetWidth(i)){
    width = Math.Max(width, Window.GetWidth(i));
    i++;
    }
  return width;
};

Window.GetMaxHeight = fun (){
  i = 0;
  height = 0;
  while (Window.GetHeight(i)){
    height = Math.Max(height, Window.GetHeight(i));
    i++;
    }
  return height;
};

anim.imagecount = 100;
anim.target_width =  0.2* 0.46 * Window.GetWidth();
anim.target_height =  0.2* 0.46 * Window.GetWidth();

fun RotatedImage (index){
    index = Math.Int(index);
    if (!RotatedImageCache[index])
        RotatedImageCache[index] = anim.original_image.Rotate((Math.Pi*2*index)/anim.imagecount).Scale(anim.target_width, anim.target_height);

    return RotatedImageCache[index];
    }


if (Plymouth.GetMode() == "suspend" || Plymouth.GetMode() == "resume") {
  background.original_image = ImageNew("suspend.png");
  Window.SetBackgroundTopColor(1, 0, 0);
  Window.SetBackgroundBottomColor(0, 1, 0);
}
else {
  logo.original_image = ImageNew("logo.png");
  background.original_image = ImageNew("background.png");
  Window.SetBackgroundTopColor(0.234, 0.43, 0.705);
  Window.SetBackgroundBottomColor(0.16, 0.25, 0.44);

  anim.image= ImageNew("animation.png");
  anim.original_image= anim.image.Scale(anim.target_width, anim.target_width);

  anim.sprite = SpriteNew();
  anim.sprite.SetImage(RotatedImage (0));
  anim.sprite.SetX((Window.GetX() + Window.GetWidth() - RotatedImage(0).GetWidth()) / 2);
  anim.sprite.SetY(Window.GetY() + Window.GetHeight() * 0.37);
  anim.angle = 0;
  anim.index = 0;


}
#change reduction size to make logo bigger
ratio =  logo.original_image.GetWidth() / logo.original_image.GetHeight();
reduction = 0.4;
logo.image = logo.original_image.Scale(reduction * Window.GetMaxWidth() , reduction / ratio *  Window.GetMaxWidth());
logo.sprite = SpriteNew();
logo.sprite.SetImage(logo.image);
logo.opacity_angle = 0;
#change logo location
logo.sprite.SetX((Window.GetX() + Window.GetMaxWidth()  - logo.image.GetWidth())  / 2);
logo.sprite.SetY(Window.GetY() + Window.GetHeight() * 0.37);
#background image attributs x,z,y
background.image = background.original_image.Scale(Window.GetMaxWidth() , Window.GetMaxHeight());
background.sprite = SpriteNew();
background.sprite.SetImage(background.image);
background.sprite.SetPosition(Window.GetX(), Window.GetY(), -10);

sprite_prompt = SpriteNew();

fun refresh_callback ()
  {
    if (status == "normal")
      {
#anim.index=speed of rotation
    anim.index += 1;
    anim.index %= anim.imagecount;
    anim.sprite.SetImage(RotatedImage (anim.index));
        #anim.sprite.SetOpacity (1);
    motif.sprite.SetOpacity(motif.opacity);
      }
    else
      {
        anim.sprite.SetOpacity(0);
    motif.sprite.SetOpacity(0);
      }

  }

if (Plymouth.GetMode() != "suspend" && Plymouth.GetMode() != "resume") {
  Plymouth.SetRefreshFunction (refresh_callback);
}

#----------------------------------------- Dialog --------------------------------

status = "normal";

fun dialog_setup()
  {
    local.box;
    local.lock;
    local.entry;
    local.prompt_sprite;

    box.image = ImageNew("box.png");
    lock.image = ImageNew("lock.png");
    entry.image = ImageNew("entry.png");

    box.sprite = SpriteNew();
    box.sprite.SetImage(box.image);
    box.x = Window.GetX() + Window.GetWidth()  / 2 - box.image.GetWidth()/2;
    box.y = Window.GetY() + Window.GetHeight() / 2 - box.image.GetHeight()/2;
    box.z = 10000;
    box.sprite.SetPosition(box.x, box.y, box.z);

    lock.sprite = SpriteNew();
    lock.sprite.SetImage(lock.image);
    lock.x = box.x + box.image.GetWidth()/2 - (lock.image.GetWidth() + entry.image.GetWidth()) / 2;
    lock.y = box.y + box.image.GetHeight()/2 - lock.image.GetHeight()/2;
    lock.z = box.z + 1;
    lock.sprite.SetPosition(lock.x, lock.y, lock.z);

    entry.sprite = SpriteNew();
    entry.sprite.SetImage(entry.image);
    entry.x = lock.x + lock.image.GetWidth();
    entry.y = box.y + box.image.GetHeight()/2 - entry.image.GetHeight()/2;
    entry.z = box.z + 1;
    entry.sprite.SetPosition(entry.x, entry.y, entry.z);

    prompt_sprite = SpriteNew();
    prompt_sprite.SetPosition(box.x, box.y - 20, box.z);

    global.dialog.box = box;
    global.dialog.lock = lock;
    global.dialog.entry = entry;
    global.dialog.bullet_image = ImageNew("bullet.png");
    global.dialog.prompt_sprite = prompt_sprite;
    dialog_opacity (1);
  }

fun dialog_opacity(opacity)
  {
    dialog.box.sprite.SetOpacity(opacity);
    dialog.lock.sprite.SetOpacity(opacity);
    dialog.entry.sprite.SetOpacity(opacity);
    dialog.prompt_sprite.SetOpacity(opacity);
    for (index = 0; dialog.bullet[index]; index++)
      {
        dialog.bullet[index].sprite.SetOpacity(opacity);
      }
  }

fun display_normal_callback ()
  {
    global.status = "normal";
    if (global.dialog)
      dialog_opacity (0);
  }

fun display_password_callback (prompt, bullets)
  {
    global.status = "password";
    if (!global.dialog) 
    dialog_setup();
    else 
    dialog_opacity(1);
    motif.sprite.SetOpacity(0);
    anim.sprite.SetOpacity(0);

    dialog.prompt_sprite.SetImage(Image.Text(prompt, 1.0, 1.0, 1.0));
    for (index = 0; dialog.bullet[index] || index < bullets; index++)
      { 

        if (!dialog.bullet[index])
          {
            dialog.bullet[index].sprite = SpriteNew();
            dialog.bullet[index].sprite.SetImage(dialog.bullet_image);
            dialog.bullet[index].x = dialog.entry.x + index * dialog.bullet_image.GetWidth();
            dialog.bullet[index].y = dialog.entry.y + dialog.entry.image.GetHeight() / 2 - dialog.bullet_image.GetHeight() / 2;
            dialog.bullet[index].z = dialog.entry.z + 1;
            dialog.bullet[index].sprite.SetPosition(dialog.bullet[index].x, dialog.bullet[index].y, dialog.bullet[index].z);
          }
        if (index < bullets)
          dialog.bullet[index].sprite.SetOpacity(1);
        else
          dialog.bullet[index].sprite.SetOpacity(0);
      }
  }

fun display_message_callback (prompt)
  {

prompt = Image.Text(prompt,1.0, 1.0, 1.0);
sprite_prompt.SetImage(prompt);
sprite_prompt.SetPosition(Window.GetX() + (Window.GetWidth() - prompt.GetWidth()) / 2, Window.GetY() + Window.GetHeight() * 0.93, 2);
  }

/* instantiate dialog at startup, to ensure all icons are loaded in memory before initrd is unmounted, in case /usr isn't mounted yet */
dialog_setup(); dialog_opacity(0);
Plymouth.SetDisplayNormalFunction(display_normal_callback);
Plymouth.SetDisplayPasswordFunction(display_password_callback);
Plymouth.SetMessageFunction(display_message_callback);

#----------------------------------------- Progress Bar --------------------------------

progress_box.image = Image("progress_box.png");
progress_box.sprite = Sprite(progress_box.image);

progress_box.x = Window.GetX() + Window.GetWidth() / 2 - progress_box.image.GetWidth() / 2;
progress_box.y = Window.GetY() + Window.GetHeight() * 0.65 - progress_box.image.GetHeight() / 2;
progress_box.sprite.SetPosition(progress_box.x, progress_box.y, 0);

progress_bar.original_image = Image("progress_bar.png");
progress_bar.sprite = Sprite();

progress_bar.x = Window.GetX() + Window.GetWidth()  / 2 -        progress_bar.original_image.GetWidth() / 2;
progress_bar.y = Window.GetY() + Window.GetHeight() * 0.65  - progress_box.image.GetHeight() / 2 + (progress_box.image.GetHeight() - progress_bar.original_image.GetHeight()) / 2;
progress_bar.sprite.SetPosition(progress_bar.x, progress_bar.y, 1);

fun progress_callback (duration, progress)
  {
    if (progress_bar.image.GetWidth () != Math.Int (progress_bar.original_image.GetWidth () * progress))
      {
        progress_bar.image = progress_bar.original_image.Scale(progress_bar.original_image.GetWidth(progress_bar.original_image) * progress * 3, progress_bar.original_image.GetHeight());
        progress_bar.sprite.SetImage (progress_bar.image);
      }
  }

Plymouth.SetBootProgressFunction(progress_callback);

#----------------------------------------- Status Update --------------------------------

NUM_SCROLL_LINES = 5;
LINE_WIDTH = 55;
# width of one character
CHAR_WIDTH = 7;
# height of one character
CHAR_HEIGHT = 10;

msg_color = [0.5,0.5,0.5]; # msg_color is array

fun update_status_callback(sta) {
  if (sta == "failed") msg_color = [1,0,0];
  if (sta == "warning") msg_color = [0.8,0.8,0];
  if (sta == "normal") msg_color = [0.5,0.5,0.5];
}

fun StringLength(string) {
  index = 0;
  str = String(string);
  while(str.CharAt(index)) index++;
  return index;
}

// Initialising text images and their positions
// 20 is the height (including line spacing) of each line
for (i=0; i < NUM_SCROLL_LINES; i++) {
  lines[i]= Image.Text("",0,0,0);
  message_sprite[i] = Sprite();
  message_sprite[i].SetX (Window.GetX() + (screen_width / 2 ) - (LINE_WIDTH * CHAR_WIDTH / 2));
  message_sprite[i].SetY (Window.GetY() + (screen_height / 2) + (logo_height /2) +(logo_height * 1.2)+ (i * CHAR_HEIGHT * 2) );
  message_sprite[i].SetZ (10000);
}

pretext = String("");

fun scroll_message_callback(text) {

 nobreak = 0;
   if (text.CharAt(0) == ">") {    # "no linebreak" flag, like "-n"
       text = text.SubString(1, StringLength(text)); # remove ">" at front
       nobreak = 1;
   }

   if (pretext == "") {

       if (nobreak == 1) pretext = text;

   // Truncate the message if too long
   if (StringLength(text) > LINE_WIDTH) {
     text = text.SubString(0, LINE_WIDTH - 3);
     text += "...";
   }

   // Shift messages one up
   for (i = 0; i < NUM_SCROLL_LINES - 1; i++) {
     lines[i] = lines[i+1];
   }
 else {    # the previous message was flagged to have no linebreak

          // Truncate the message if too long
       if (StringLength(text) > LINE_WIDTH - 5) { # leave min. 5 for pretext
         text = text.SubString(0, LINE_WIDTH - 8);
         text += "...";
       }

          # Truncate the previous message if too long
       if (StringLength(pretext) > (LINE_WIDTH - StringLength(text))) {
         pretext = pretext.SubString(0, LINE_WIDTH - StringLength(text) - 3);
         pretext += "...";
       }

       text = pretext + text;

       if (nobreak == 1) pretext = text;
       else pretext = "";

   }

   // Create the image for the latest message
#  original script had "lines[i]"   
   lines[i] = Image.Text( text, 0.5, 0.5, 0.5);

   // Re-allocate the text images to sprites
   for (i = 0; i < NUM_SCROLL_LINES; i++) {
     message_sprite[i].SetImage(lines[i]);
   }
}

Plymouth.SetUpdateStatusFunction(scroll_message_callback);

# messages get added to updates
Plymouth.SetMessageFunction(scroll_message_callback);

#----------------------------------------- Quit --------------------------------

fun quit_callback ()
{
 anim.sprite.SetOpacity (0);
  if (Plymouth.GetMode() == "shutdown") {
   motif.sprite.SetOpacity(0);
  }
}

Plymouth.SetQuitFunction(quit_callback);

OK so I have provided almost all the info needed, if anyone is familiar with this let me know what I am missing to get the boot messages through to Plymouth. Thanks


Source: (StackOverflow)

Can I change the word ubuntu from my plymouth default theme?

I have seen that plymouth themes in different distros are the same they just put a logo or a word..so if I want to put whatever I want...can somebody tell me with what program or editing what file?


Source: (StackOverflow)

How do I revert the Plymouth theme back to default after purging Kubuntu?

I recently installed the KDE Kubuntu desktop but after somehow working with i decided to use pure GNOME Ubuntu desktop again.I remove Kubuntu desktop and its packages completely but Kubuntu background image still running at time of booting the system and shutting down it. I tried the steps below at terminal , it made the shutting down background image correct but still the background image of booting time is kubuntu image.

sudo update-alternatives --set default.plymouth /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth

How could i change this image to the default Ubuntu image too?


Source: (StackOverflow)

How can I customize the Ubuntu boot up logo?

I am making a custom distribution, and have a question about the Ubuntu Logo with 5 dots displayed when booting up.

The Ubuntu-Logo-Script in the /lib/plymouth/themes/ubuntutext folder has the word Ubuntu and beneath that 5 progressing 'dots'. Is it possible to remove the progress bar dots, and instead replace it with a faded Ubuntu logo, that gradually colors up to full?

enter image description here


Source: (StackOverflow)

How do I disable the boot splash screen, and only show kernel and boot text instead?

I'd like to be able to disable the Ubuntu splash screen that I see on boot with the indicator meter of progress, and replace that with a text-only readout of the boot up process (such as you can get by hitting the esc key during the splash screen). Is this possible?

I am not asking to disable X and get to text-only login, I"m asking how to deactivate the "Ubuntu" loading screen with the dots, so that I can see text output from the boot process - processes being started, kernel messages, etc. When I wrote this question I was not asking how to disable X altogether, only the boot splash screen.


Source: (StackOverflow)

Enabling Nvidia driver messes up splash screen

When you boot from live CD, or doing the first boot after installing Ubuntu, splash screen looks awesome. But as soon as you enable nvidia-current driver, installed with apt-get, splash screen goes all crazy.

With crazy I mean that resolution is very low, font(I assume) is very weird and it all looks like it's been broken.

This happened with 10.04 and now again with 10.10.

How do I fix splash screen after enabling nvidia drivers?


Source: (StackOverflow)

Why is plymouthd crashing on startup? [duplicate]

This question already has an answer here:

Every time my laptop boots, I am greeted by several "Ubuntu 13.10 has experienced an internal error" dialogs once the graphical desktop environment (whatever it's called) is displayed. Apparently the problem originates from plymouthd, which is (unsurprisingly) the daemon of the Plymouth boot splash application.

Has anyone ever found a fix for this type of issue?

(I would provide log excerpts but I'm not sure where to find them.)


Source: (StackOverflow)

How do I customise my Plymouth theme? [duplicate]

I want to update my splash screen (when I boot or logoff), logo etc... to use the solar theme.

I did:

sudo apt-get install plymouth-theme-solar

then I went to the themes folder to customize it:

/lib/plymouth/themes/

and I updated logos and other images:

sudo update-initramfs -u

I think this command is the right one to run but when I run it, nothing is updated

What am I missing?


Source: (StackOverflow)

What alternatives are available to replace the purple boot splash screen?

I would love an animated splash screen, just for a bit of eye candy to replace the purple splash (with 4 dots) during the boot sequence. I know it will slow down boot time but I don't care I just want it to look good. When I show my friends how much better looking Ubuntu is than windows the splash really lets it down.

Any one know a good alternative to the existing Plymouth boot?

I could not get mine to change the splash screen (with terminal or gui apps), and it is now broken, it just shows a load of error messages at boot but still starts Ubuntu.


Source: (StackOverflow)