install: Add alongside-cleanup systemd service

This will remove all rpms and containers/images from the previous
install (found in /sysroot) on reboot after running `install to-existing-root.`

Signed-off-by: ckyrouac <[email protected]>

Author: ckyrouac

contrib/packaging/bootc.spec

@@ -72,6 +72,7 @@ Recommends: podman
 This package provides a utility to simplify reinstalling the current system to a given bootc image.
 
 %global system_reinstall_bootc_install_podman_path %{_prefix}/lib/system-reinstall-bootc/install-podman
+%global install_alongside_cleanup %{_prefix}/lib/bootc/install-alongside-cleanup
 
 %prep
 %autosetup -p1 -a1
@@ -82,6 +83,7 @@ cat vendor-config.toml >> .cargo/config.toml
 rm vendor-config.toml
 
 %build
+export INSTALL_ALONGSIDE_CLEANUP=%{install_alongside_cleanup}
 # Build the main bootc binary
 %if 0%{?fedora} || 0%{?rhel} >= 10
     %cargo_build %{?with_rhsm:-f rhsm}
@@ -115,13 +117,26 @@ sed -i -e '/https:\/\//d' cargo-vendor.txt
 %if %{with ostree_ext}
 make install-ostree-hooks DESTDIR=%{?buildroot}
 %endif
+
 mkdir -p %{buildroot}/%{dirname:%{system_reinstall_bootc_install_podman_path}}
 cat >%{?buildroot}/%{system_reinstall_bootc_install_podman_path} <<EOF
 #!/bin/bash
 exec dnf -y install podman
 EOF
 chmod +x %{?buildroot}/%{system_reinstall_bootc_install_podman_path}
 
+mkdir -p %{buildroot}/%{dirname:%{install_alongside_cleanup}}
+cat >%{?buildroot}/%{install_alongside_cleanup} <<EOF
+#!/bin/bash
+set -xeuo pipefail
+mount --o remount,rw /sysroot
+rpm -qa --root=/mnt --dbpath=/usr/lib/sysimage/rpm | xargs rpm -e --root=/mnt --dbpath=/usr/lib/sysimage/rpm
+
+mount --bind -o rw /sysroot/var/lib/containers /var/lib/containers
+podman images system prune --all
+EOF
+chmod +x %{?buildroot}/%{install_alongside_cleanup}
+
 %if %{with check}
 %check
 %cargo_test

systemd/bootc-install-alongside-cleanup.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Cleanup previous the installation after an alongside installation
+Documentation=man:bootc(8)
+ConditionPathExists=/run/ostree-booted
+
+[Service]
+Type=oneshot
+ExecStart=/usr/lib/bootc/install-alongside-cleanup
+PrivateMounts=true
+
+[Install]
+WantedBy=multi-user.target