ubuntu12.04设置grub背景图片

ubuntu12.04设置grub背景图片,灰常简单.

将要做为grub背景的图片放到 /boot/grub 下,然后执行

sudo update-grub

grub会自动查找该路径下的各种图片格式的文件

具体看/etc/grub.d/05_debian_theme

#!/bin/sh
set -e
grub-mkconfig helper script.
Copyright (C) 2010  Alexander Kurtz <kurtz.alex@googlemail.com>

GRUB is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GRUB is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GRUB.  If not, see http://www.gnu.org/licenses/.
Include the GRUB helper library for grub-mkconfig.
. /usr/lib/grub/grub-mkconfig_lib
We want to work in /boot/grub/ only.
test -d "{GRUB_PREFIX}"; cd "{GRUB_PREFIX}"
Set the location of a possibly necessary cache file for the background image.
NOTE: This MUST BE A DOTFILE to avoid confusing it with user-defined images.
BACKGROUND_CACHE=".background_cache"
set_default_theme(){

# Set a monochromatic theme for Ubuntu.

echo "${1}set menu_color_normal=white/black"

echo "${1}set menu_color_highlight=black/light-gray"
if [ -e /lib/plymouth/themes/default.grub ]; then
	sed "s/^/${1}/" /lib/plymouth/themes/default.grub
fi
​
}
set_background_image(){

# Step #1: Search all available output modes ...

local output

for output in ${GRUB_TERMINAL_OUTPUT}; do

if [ "x$output" = "xgfxterm" ]; then

break

fi

done
# ... and check if we are able to display a background image at all.
if ! [ "x${output}" = "xgfxterm" ]; then
	return 1
fi

# Step #2: Check if the specified background image exists.
if ! [ -f "${1}" ]; then
	return 2
fi

# Step #3: Search the correct GRUB module for our background image.
local reader
case "${1}" in
	*.jpg|*.JPG|*.jpeg|*.JPEG) reader="jpeg";;
	*.png|*.PNG) reader="png";;
	*.tga|*.TGA) reader="tga";;
	*) return 3;; # Unknown image type.
esac

# Step #4: Check if the necessary GRUB module is available.
if ! [ -f "${reader}.mod" ]; then
	return 4
fi

# Step #5: Check if GRUB can read the background image directly.
# If so, we can remove the cache file (if any). Otherwise the backgound
# image needs to be cached under /boot/grub/.
if is_path_readable_by_grub "${1}"; then
	rm --force "${BACKGROUND_CACHE}.jpeg" \
		"${BACKGROUND_CACHE}.png" "${BACKGROUND_CACHE}.tga"
elif cp "${1}" "${BACKGROUND_CACHE}.${reader}"; then
	set -- "${BACKGROUND_CACHE}.${reader}" "${2}" "${3}"
else
	return 5
fi

# Step #6: Prepare GRUB to read the background image.
if ! prepare_grub_to_access_device "`${grub_probe} --target=device "${1}"`"; then
	return 6
fi

# Step #7: Everything went fine, print out a message to stderr ...
echo "Found background image: ${1}" >&2

# ... and write our configuration snippet to stdout. Use the colors
# desktop-base specified. If we're using a user-defined background, use
# the default colors since we've got no idea how the image looks like.
# If loading the background image fails, use the default theme.
echo "insmod ${reader}"
echo "if background_image `make_system_path_relative_to_its_root "${1}"`; then"
if [ -n "${2}" ]; then
	echo "  set color_normal=${2}"
fi
if [ -n "${3}" ]; then
	echo "  set color_highlight=${3}"
fi
if [ -z "${2}" ] && [ -z "${3}" ]; then
	echo "  true"
fi
echo "else"
set_default_theme "  "
echo "fi"
​
}
Earlier versions of grub-pc copied the default background image to /boot/grub
during postinst. Remove those obsolete images if they haven't been touched by
the user. They are still available under /usr/share/images/desktop-base/ if
desktop-base is installed.
while read checksum background; do

if [ -f "{background}" ] && [ "x`sha1sum "{background}"`" = "x{checksum}  {background}" ]; then

echo "Removing old background image: ${background}" >&2

rm "${background}"

fi

done <<EOF

648ee65dd0c157a69b019a5372cbcfea4fc754a5  debian-blueish-wallpaper-640x480.png

0431e97a6c661084c59676c4baeeb8c2f602edb8  debian-blueish-wallpaper-640x480.png

968ecf6696c5638cfe80e8e70aba239526270864  debian-blueish-wallpaper-640x480.tga

11143e8c92a073401de0b0fd42d0c052af4ccd9b  moreblue-orbit-grub.png

d00d5e505ab63f2d53fa880bfac447e2d3bb197c  moreblue-orbit-grub.png

f5b12c1009ec0a3b029185f6b66cd0d7e5611019  moreblue-orbit-grub.png

EOF
Include the configuration of desktop-base if available.
if [ -f "/usr/share/desktop-base/grub_background.sh" ]; then

. "/usr/share/desktop-base/grub_background.sh"

fi
First check whether the user has specified a background image explicitly.
If so, try to use it. Don't try the other possibilities in that case
(#608263).
if [ -n "${GRUB_BACKGROUND+x}" ]; then

set_background_image "${GRUB_BACKGROUND}" || set_default_theme

exit 0

fi
Next search for pictures the user put into /boot/grub/ and use the first one.
for background in *.jpg *.JPG *.jpeg *.JPEG *.png *.PNG *.tga *.TGA; do

if set_background_image "${background}"; then

exit 0

fi

done
Next try to use the background image and colors specified by desktop-base.
if set_background_image "{WALLPAPER}" "{COLOR_NORMAL}" "${COLOR_HIGHLIGHT}"; then

exit 0

fi
If we haven't found a background image yet, use the default from desktop-base.
if set_background_image "/usr/share/images/desktop-base/desktop-grub.png"; then

exit 0

fi
Finally, if all of the above fails, use the default theme.
set_default_theme