rootlessport: reduce memory usage of the process

Don't use reexec for the rootlessport process, instead make it a
separate binary to reduce the memory usage. The problem with reexec is
that it will import all packages that podman uses and therefore loads a
lot of stuff into the heap. The rootlessport process however only needs
the rootlesskit library.
The memory usage is a concern since the rootlessport process will spawn
two process per container which has ports forwarded. The processes stay
until the container dies. On my laptop the current reexec version uses
47800 KB RSS. The new separate binary only uses 4540 KB RSS. This is
more than a 90% improvement.

The Makefile has been updated to compile the new binary and install it
to the libexec directory.

Fixes #10790

[NO TESTS NEEDED]

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/contrib/cirrus/setup_environment.sh b/contrib/cirrus/setup_environment.sh
index f2afbfef5..3786054a7 100755
--- a/contrib/cirrus/setup_environment.sh
+++ b/contrib/cirrus/setup_environment.sh
@@ -236,9 +236,19 @@ case "$TEST_FLAVOR" in
         # Use existing host bits when testing is to happen inside a container
         # since this script will run again in that environment.
         # shellcheck disable=SC2154
-        if ((CONTAINER==0)) && [[ "$TEST_ENVIRON" == "host" ]]; then
+        if [[ "$TEST_ENVIRON" == "host" ]]; then
+            if ((CONTAINER)); then
+                die "Refusing to config. host-test in container";
+            fi
             remove_packaged_podman_files
             make install PREFIX=/usr ETCDIR=/etc
+        elif [[ "$TEST_ENVIRON" == "container" ]]; then
+            if ((CONTAINER)); then
+                remove_packaged_podman_files
+                make install PREFIX=/usr ETCDIR=/etc
+            fi
+        else
+            die "Invalid value for $$TEST_ENVIRON=$TEST_ENVIRON"
         fi
 
         install_test_configs