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Avoids a race where the pipe could be inherited by another process spawning at about the same time. If the other process didn't exit quickly (e.g. if it was a custom script that did its own looping), it would keep the write end of the pipe open, and so reading from the pipe to try to get the command's output would block. This bug manifested as some custom modules randomly not appearing in the bar, requiring a reload to fix. The custom script had run and exited, but the pipe had been inherited by another process, and the thread that updated the module's output was blocked trying to read from it.
Waybar 
Highly customizable Wayland bar for Sway and Wlroots based compositors.
Available in Arch community or AUR, Gentoo, openSUSE, and Alpine Linux.
Waybar examples
Current features
- Sway (Workspaces, Binding mode, Focused window name)
- River (Mapping mode, Tags, Focused window name)
- Hyprland (Focused window name)
- DWL (Tags) requires dwl ipc patch
- Tray #21
- Local time
- Battery
- UPower
- Network
- Bluetooth
- Pulseaudio
- Wireplumber
- Disk
- Memory
- Cpu load average
- Temperature
- MPD
- Custom scripts
- Custom image
- Multiple output configuration
- And many more customizations
Configuration and Styling
See the wiki for more details.
Installation
Waybar is available from a number of Linux distributions:
An Ubuntu PPA with more recent versions is available here.
Building from source
$ git clone https://github.com/Alexays/Waybar
$ cd Waybar
$ meson build
$ ninja -C build
$ ./build/waybar
# If you want to install it
$ ninja -C build install
$ waybar
Dependencies
gtkmm3
jsoncpp
libsigc++
fmt
wayland
chrono-date
spdlog
libgtk-3-dev [gtk-layer-shell]
gobject-introspection [gtk-layer-shell]
libgirepository1.0-dev [gtk-layer-shell]
libpulse [Pulseaudio module]
libnl [Network module]
libappindicator-gtk3 [Tray module]
libdbusmenu-gtk3 [Tray module]
libmpdclient [MPD module]
libsndio [sndio module]
libevdev [KeyboardState module]
xkbregistry
upower [UPower battery module]
Build dependencies
cmake
meson
scdoc
wayland-protocols
On Ubuntu, you can install all the relevant dependencies using this command (tested with 19.10 and 20.04):
sudo apt install \
clang-tidy \
gobject-introspection \
libdbusmenu-gtk3-dev \
libevdev-dev \
libfmt-dev \
libgirepository1.0-dev \
libgtk-3-dev \
libgtkmm-3.0-dev \
libinput-dev \
libjsoncpp-dev \
libmpdclient-dev \
libnl-3-dev \
libnl-genl-3-dev \
libpulse-dev \
libsigc++-2.0-dev \
libspdlog-dev \
libwayland-dev \
scdoc \
upower \
libxkbregistry-dev
Contributions welcome!
Have fun :)
The style guidelines are Google's
License
Waybar is licensed under the MIT license. See LICENSE for more information.