add support files for cosmic-session

Makefile

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+export prefix ?= /usr
+sysconfdir ?= /etc
+bindir = $(prefix)/bin
+libdir = $(prefix)/lib
+sharedir = $(prefix)/share
+
+BINARY = cosmic-comp
+ID = com.pop-os.Compositor
+TARGET = debug
+DEBUG ?= 0
+
+.PHONY = all clean install uninstall vendor
+
+ifeq ($(DEBUG),0)
+	TARGET = release
+	ARGS += --release
+endif
+
+VENDOR ?= 0
+ifneq ($(VENDOR),0)
+	ARGS += --frozen
+endif
+
+TARGET_BIN="$(DESTDIR)$(bindir)/$(BINARY)"
+
+all: extract-vendor
+	cargo build $(ARGS)
+
+clean:
+	cargo clean
+
+distclean:
+	rm -rf .cargo vendor vendor.tar target
+
+vendor:
+	mkdir -p .cargo
+	cargo vendor | head -n -1 > .cargo/config
+	echo 'directory = "vendor"' >> .cargo/config
+	tar pcf vendor.tar vendor
+	rm -rf vendor
+
+extract-vendor:
+ifeq ($(VENDOR),1)
+	rm -rf vendor; tar pxf vendor.tar
+endif
+
+install:
+	install -Dm0644 "data/cosmic.desktop" "$(DESTDIR)$(sharedir)/wayland-sessions/cosmic.desktop"
+	install -Dm0644 "data/cosmic-session.target" "$(DESTDIR)$(libdir)/systemd/user/cosmic-session.target"
+	install -Dm0644 "data/cosmic-session-pre.target" "$(DESTDIR)$(libdir)/systemd/user/cosmic-session-pre.target"
+	install -Dm0644 "data/cosmic-comp.service" "$(DESTDIR)$(libdir)/systemd/user/cosmic-comp.service"
+	install -Dm04755 "data/cosmic-service" "$(DESTDIR)/$(bindir)/cosmic-service"
+	install -Dm04755 "target/$(TARGET)/$(BINARY)" "$(TARGET_BIN)"
+
+
+uninstall:
+	rm "$(DESTDIR)$(sharedir)/wayland-sessions/cosmic.desktop"
+	rm "$(TARGET_BIN)"

data/cosmic-comp.service

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+[Unit]
+Description=Cosmic wayland compositor
+BindsTo=cosmic-session.target
+Wants=cosmic-session-pre.target
+After=cosmic-session-pre.target
+Before=cosmic-session.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/cosmic-comp
+Restart=never
+ExecStopPost=/usr/bin/systemctl --user unset-environment DISPLAY WAYLAND_DISPLAY

data/cosmic-service

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+#!/bin/bash
+
+# From: https://people.debian.org/~mpitt/systemd.conf-2016-graphical-session.pdf
+
+# robustness: if the previous graphical session left some failed units,
+# reset them so that they don't break this startup
+for unit in $(systemctl --user --no-legend --state=failed --plain list-units | cut -f1 -d' '); do
+	partof="$(systemctl --user show -p PartOf --value "$unit")"
+	for target in cosmic-session.target graphical-session.target; do
+		if [ "$partof" = "$target" ]; then
+			systemctl --user reset-failed "$unit"
+			break
+		fi
+	done
+done
+
+# /etc/profile contains a lot of important environment variables
+source /etc/profile
+
+export XDG_CURRENT_DESKTOP=cosmic
+
+# save environment variables that will be added to systemd
+new_env=$(systemctl --user show-environment | cut -d'=' -f 1 | sort | comm -13 - <(env | cut -d'=' -f 1 | sort))
+
+# import environment variables from the login manager
+systemctl --user import-environment
+
+# then start the service
+systemctl --wait --user start cosmic-comp.service
+
+# cleanup environment
+systemctl --user unset-environment $new_env

data/cosmic-session-pre.target

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+[Unit]
+Description=Cosmic session early services
+Documentation=man:systemd.special(7)
+RefuseManualStart=yes
+StopWhenUnneeded=yes
+BindsTo=graphical-session-pre.target
+Before=graphical-session-pre.target
+Before=cosmic-session.target

data/cosmic-session.target

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+[Unit]
+Description=Cosmic session
+Documentation=man:systemd.special(7)
+RefuseManualStart=yes
+StopWhenUnneeded=yes
+BindsTo=graphical-session.target
+Before=graphical-session.target

data/cosmic.desktop

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+[Desktop Entry]
+Name=Cosmic
+Commment=This session logs you into Cosmic
+Exec=/usr/bin/cosmic-service
+Type=Application
+DesktopNames=pop:COSMIC
+X-GDM-SessionRegisters=false