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murar8/copy-gdm-config

Created May 1, 2023 12:33
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copy-gdm-config
#!/usr/bin/env bash
#
# Description | Copy the latest monitor configuration to GDM.
# Author | Lorenzo Murarotto
# Email | lnzmrr@gmail.com
shopt -s nullglob # Unmatched globs expand to null.
GDM_CONFIG_DIR=/var/lib/gdm/.config
GDM_CONFIG_FILE=$GDM_CONFIG_DIR/monitors.xml
if [ ! -d $GDM_CONFIG_DIR ]; then
echo "GDM configuration directory not present, exiting."
exit 1
fi
for config in /home/*/.config/monitors.xml; do
if [ ! -f "$GDM_CONFIG_FILE" ] || [[ $(date +%s -r "$config") > $(date +%s -r "$GDM_CONFIG_FILE") ]]; then
echo "Copying newest file version from '$config' to '$GDM_CONFIG_FILE'."
cp "$config" "$GDM_CONFIG_FILE"
chown gdm:gdm "$GDM_CONFIG_FILE"
fi
done
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murar8 commented May 1, 2023 •
edited
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Copy the latest monitor configuration to gdm at every boot.

Note: If you use GDM under Wayland, you must also use a monitors.xml that was created under Wayland.

More info: https://wiki.archlinux.org/title/GDM

Installation

Install the script:

curl https://gist.githubusercontent.com/murar8/80af35c72edb07d92711c6df1882a4d0/raw/5545d604f627c0180ba2953fd345d501b5926e47/copy-gdm-config | sudo tee /usr/local/bin/copy-gdm-config
sudo chmod +x /usr/local/bin/copy-gdm-config

Make it run before gdm starts

sudo systemctl edit gdm.service

Make the file look like this:

### Editing /etc/systemd/system/gdm.service.d/override.conf
### Anything between here and the comment below will become the contents of the drop-in file

[Service]
ExecStartPre=-/usr/local/bin/copy-gdm-config

# Edits below this comment will be discarded

Now the last modified monitor configuration will be applied to gdm at each boot!

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