Ubuntu 21.10 更改登录界面背景
新建一个名为 change-gdm-background.sh 的文件，并复制如下内容，或者直接使用 archive 目录下已测试过的文件：change-gdm-background.sh
开始
#!/usr/bin/env bash
# Autor: Thiago Silva
# Contact: thiagos.dasilva@gmail.com
# URL: https://github.com/thiggy01/change-gdm-background
# =================================================================== #
# Check if script is run by root.
if [ "$(id -u)" -ne 0 ] ; then
echo 'This script must be run as root or with the sudo command.'
exit 1
fi
# Check what linux distro is being used.
distro="$(lsb_release -c | cut -f 2)"
if ! [[ "$distro" =~ (focal|groovy|hirsute|impish) ]]; then
echo 'Sorry, this script only works with focal, groovy or hirsute distros.'
exit 1
fi
# Check if glib 2.0 development libraries are installed.
if [ ! -x "$(command -v glib-compile-resources)" ]; then
echo 'Additional glib 2.0 libraries need to be installed.'
read -p 'Type y or Y to proceed. Any other key to exit: ' -n 1
if [[ "$REPLY" =~ ^[yY]$ ]]; then
apt install libglib2.0-dev-bin
else
echo "This tool can't run without required libraries"
echo "Exiting."
echo
exit 1
fi
fi
# Assign the default gdm theme file path.
if [ "$(lsb_release -i | awk '{print $3}')" == 'Ubuntu' ]; then
gdm3Resource=/usr/share/gnome-shell/theme/Yaru/gnome-shell-theme.gresource
elif [ "$(lsb_release -i | awk '{print $3}')" == 'Pop' ]; then
gdm3Resource=/usr/share/gnome-shell/theme/Pop/gnome-shell-theme.gresource
fi
# Create a backup file of the original theme if there isn't one.
[ ! -f "$gdm3Resource"~ ] && cp "$gdm3Resource" "$gdm3Resource~"
# Restore backup function.
restore () {
mv "$gdm3Resource~" "$gdm3Resource"
if [ "$?" -eq 0 ]; then
chmod 644 "$gdm3Resource"
echo 'GDM background sucessfully restored.'
read -p 'Do you want to restart gdm to apply change? (y/n):' -n 1
echo
if [[ "$REPLY" =~ ^[yY]$ ]]; then
service gdm restart
else
echo 'Restart GDM service to apply change.'
exit 0
fi
fi
}
# Restore the original gdm3 theme.
[ "$1" == "--restore" ] && restore
#Define main variables.
gdm3xml=$(basename "$gdm3Resource").xml
workDir="/tmp/gdm3-theme"
# Create directories from resource list.
CreateDirs() {
for resource in `gresource list "$gdm3Resource~"`; do
resource="${resource#\/org\/gnome\/shell\/}"
if [ ! -d "$workDir"/"${resource%/*}" ]; then
mkdir -p "$workDir"/"${resource%/*}"
fi
done
}
# Extract resources from binary file.
ExtractRes() {
for resource in `gresource list "$gdm3Resource~"`; do
gresource extract "$gdm3Resource~" "$resource" > \
"$workDir"/"${resource#\/org\/gnome\/shell\/}"
done
}
# Compile resources into a gresource binary file.
CompileRes() {
glib-compile-resources --sourcedir=$workDir/theme/ $workDir/theme/"$gdm3xml"
}
# Moves the newly created resource to its default place.
MoveRes() {
mv $workDir/theme/gnome-shell-theme.gresource $gdm3Resource
}
# Check if gresource was sucessfuly moved to its default folder.
Check() {
if [ "$?" -eq 0 ]; then
# Solve a permission change issue (thanks to @huepf from github).
chmod 644 "$gdm3Resource"
echo 'GDM background sucessfully changed.'
read -p 'Do you want to restart gdm to apply change? (y/n):' -n 1
echo
# If change was successful apply ask for gdm restart.
if [[ "$REPLY" =~ ^[yY]$ ]]; then
service gdm restart
else
echo "Change will be applied only after restarting gdm"
echo
fi
else
# If something went wrong, restore backup file.
echo 'something went wrong.'
restore
echo 'No changes were applied.'
fi
}
CleanUp() {
# Remove temporary directories and files.
rm -r "$workDir"
exit 0
}
ReplacingBg() {
oldBg="#lockDialogGroup \{\n?.*?\}"
if [[ "$distro" == "impish" ]]; then
perl -i -0777 -pe "s/$oldBg/$newBg/s" "$workDir"/theme/gdm.css
else
perl -i -0777 -pe "s/$oldBg/$newBg/s" "$workDir"/theme/gdm3.css
fi
}
# Test if argument is an image file.
if [[ $(file --mime-type -b "$1") == image/*g ]]; then
# Define image variables.
gdmBgImg=$(realpath "$1")
imgFile=$(basename "$gdmBgImg")
# Call procedures to create directories and extract resources to them.
CreateDirs
ExtractRes
# Copy selected image to the resources directory.
cp "$gdmBgImg" "$workDir"/theme
# Change gdm background to the image you submited.
newBg="#lockDialogGroup {
background: url('resource:\/\/\/org\/gnome\/shell\/theme\/$imgFile');
background-size: cover; }"
ReplacingBg
# Generate gresource xml file.
echo '<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/gnome/shell/theme">' > "$workDir"/theme/"$gdm3xml"
for file in `gresource list "$gdm3Resource~"`; do
echo " <file>${file#\/org\/gnome/shell\/theme\/}</file>" \
>> "$workDir"/theme/"$gdm3xml"
done
echo " <file>$imgFile</file>" >> "$workDir"/theme/"$gdm3xml"
echo ' </gresource>
</gresources>' >> "$workDir"/theme/"$gdm3xml"
# Compile the new gresource.
CompileRes
# Move gresource to the default place.
MoveRes
# Check if everything was successful.
Check
# Remove temporary files and exit.
CleanUp
# Change background colors.
elif [[ "$1" =~ ^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$ ]]; then
# Store selected background color.
BgColor="$1"
CreateDirs
ExtractRes
# Change gdm background to the color you submited.
newBg="#lockDialogGroup {
background: $BgColor;
background-size: cover; }"
ReplacingBg
# Generate the gresource xml file.
echo '<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/gnome/shell/theme">' > "$workDir"/theme/"$gdm3xml"
for file in `gresource list "$gdm3Resource~"`; do
echo " <file>${file#\/org\/gnome/shell\/theme\/}</file>" \
>> "$workDir"/theme/"$gdm3xml"
done
echo ' </gresource>
</gresources>' >> "$workDir"/theme/"$gdm3xml"
# Compile the new gresource.
CompileRes
# Move gresource to the default place.
MoveRes
# Remove temporary files and exit.
CleanUp
else
# If no file was submited or file submited isn't an image,
# show this message.
echo 'Image file not found or wrong color hex code.'
echo 'Please, submit a .jpg or .png image file or a valid hex code.'
echo 'Usage: sudo ./ubuntu-20.04-change-gdm-background /path/to/image.*g'
echo 'Usage: sudo ./ubuntu-20.04-change-gdm-background \#yourhexcode'
fi