commands: handle older clients elegantly

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/commands.c b/src/lxc/commands.c
index 6fcf376daaa93101409828a2752a47d745af493e..11816b34c78b11db8a222a5234fa516e817eb826 100644 (file)
--- a/src/lxc/commands.c
+++ b/src/lxc/commands.c
@@ -609,6 +609,9 @@ int lxc_cmd_get_cgroup_ctx(const char *name, const char *lxcpath,
                        .datalen        = size_ret_ctx,
                        .data           = ret_ctx,
                },
+               .rsp = {
+                       .ret = -ENOSYS,
+               },
        };
        int ret, stopped;
 
@@ -617,7 +620,7 @@ int lxc_cmd_get_cgroup_ctx(const char *name, const char *lxcpath,
 
        ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL);
        if (ret < 0)
-               return log_debug_errno(-1, errno, "Failed to process cgroup fd command");
+               return log_debug_errno(-1, errno, "Failed to process cgroup context command");
 
        if (cmd.rsp.ret < 0)
                return log_debug_errno(-EBADF, errno, "Failed to receive cgroup fds");
@@ -1542,6 +1545,9 @@ int lxc_cmd_get_cgroup2_fd(const char *name, const char *lxcpath)
                .req = {
                        .cmd = LXC_CMD_GET_CGROUP2_FD,
                },
+               .rsp = {
+                       ret = -ENOSYS,
+               },
        };
 
        ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL);
@@ -1561,6 +1567,9 @@ int lxc_cmd_get_limiting_cgroup2_fd(const char *name, const char *lxcpath)
                .req = {
                        .cmd = LXC_CMD_GET_LIMITING_CGROUP2_FD,
                },
+               .rsp = {
+                       .ret = -ENOSYS,
+               },
        };
 
        ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL);
@@ -1568,7 +1577,7 @@ int lxc_cmd_get_limiting_cgroup2_fd(const char *name, const char *lxcpath)
                return -1;
 
        if (cmd.rsp.ret < 0)
-               return log_debug_errno(cmd.rsp.ret, -cmd.rsp.ret, "Failed to receive cgroup2 fd");
+               return syswarn_set(cmd.rsp.ret, "Failed to receive cgroup2 limit fd");
 
        return PTR_TO_INT(cmd.rsp.data);
 }