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4b9b62bb3e
Unbreak the `agent-ctl` tool connecting to the agent with a Unix domain
socket.
It appears that [1] changed the behaviour of connecting to the agent
using a local Unix socket (which is not used by Kata under normal
operation).
The change can be seen by reverting to commit
72b8144b56 (the one before [1]) and
running the agent manually as:
```bash
$ sudo KATA_AGENT_SERVER_ADDR=unix:///tmp/foo.socket target/x86_64-unknown-linux-musl/release/kata-agent
```
Before [1], in another terminal we see this:
```bash
$ sudo lsof -U 2>/dev/null |grep foo|awk '{print $9}'
@/tmp/foo.socket@
```
But now, we see the following:
```bash
$ sudo lsof -U 2>/dev/null |grep foo|awk '{print $9}'
@/tmp/foo.socket
```
Note the last byte which represents a nul (`\0`) value.
The `agent-ctl` tool used to add that trailing nul but now it seems to not
be needed, so this change removes it, restoring functionality. No
external changes are necessary so the `agent-ctl` tool can connect to
the agent as below like this:
```bash
$ cargo run -- -l debug connect --server-address "unix://@/tmp/foo.socket" --bundle-dir "$bundle_dir" -c Check -c GetGuestDetails
```
[1] - https://github.com/kata-containers/kata-containers/issues/3124
Fixes: #4164.
Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>