Skip system slice name

This shortens paths like /system.slice/system-postgres.slice/postgres@12-main.service to /[S]/postgres@12-main.
Without this some cgroup names for getty processes explode in length.

1 files changed, 6 insertions, 0 deletions

diff --git a/linux/CGroupUtils.c b/linux/CGroupUtils.c
index d6d2ae8f..22cce91b 100644
--- a/linux/CGroupUtils.c
+++ b/linux/CGroupUtils.c
@@ -66,6 +66,7 @@ static bool CGroup_filterName_internal(const char *cgroup, StrBuf_state* s, StrB
    const char* str_user_slice = "user.slice";
    const char* str_machine_slice = "machine.slice";
    const char* str_user_slice_prefix = "/user-";
+   const char* str_system_slice_prefix = "/system-";
 
    const char* str_lxc_monitor_legacy = "lxc.monitor";
    const char* str_lxc_payload_legacy = "lxc.payload";
@@ -102,6 +103,11 @@ static bool CGroup_filterName_internal(const char *cgroup, StrBuf_state* s, StrB
          if (!StrBuf_putsz(s, w, "[S]"))
             return false;
 
+         if (String_startsWith(cgroup, str_system_slice_prefix)) {
+            cgroup = strchrnul(cgroup + 1, '/');
+            continue;
+         }
+
          continue;
       }