[4.22] keystore-setup script does not create agent.properties on fresh KVM hosts

## `keystore-setup` fails to create `agent.properties` on fresh KVM hosts; KVM `addHost` cert flow then loops with "Failed to find keystore passphrase" and `setupAgentSecurity()` throws "Failed to setup certificate in the KVM agent's keystore file" (4.22)

### problem

When `LibvirtServerDiscoverer.setupAgentSecurity()` invokes `scripts/util/keystore-setup` on a freshly-installed KVM agent (one whose `/etc/cloudstack/agent/` directory contains only the package-shipped `environment.properties` and `log4j-cloud.xml` - i.e. the natural state on a first-time `addHost`, or after an operator has wiped agent state to recover from a botched provisioning attempt), the script silently fails to create `agent.properties` and silently fails to persist `keystore.passphrase=...` to it. The downstream `keystore-cert-import` invocation then reads the missing/empty `agent.properties`, exits 1 with "Failed to find keystore passphrase from file: /etc/cloudstack/agent/agent.properties, quitting!", and after the 3-attempt retry loop in `setupAgentSecurity()` the management server throws `CloudRuntimeException("Failed to setup certificate in the KVM agent's keystore file, please see logs and configure manually!")`. The host never gets added.

The defect is in `scripts/util/keystore-setup`. The passphrase-write block is gated on `[ -f "$PROPS_FILE" ]`:

```bash
PROPS_FILE="$1"
KS_FILE="$2"
KS_PASS="$3"
KS_VALIDITY="$4"
CSR_FILE="$5"
...
# Re-use existing password or use the one provided
if [ -f "$PROPS_FILE" ]; then # <- gates the entire write block
OLD_PASS=$(sed -n '/^keystore.passphrase/p' "$PROPS_FILE" | sed 's/^keystore.passphrase=//g')
if [ -n "${OLD_PASS// }" ]; then
KS_PASS="$OLD_PASS"
else
sed -i "/^keystore.passphrase.*/d" "$PROPS_FILE" 2>&1 | $LOGGER_CMD || true
echo "keystore.passphrase=$KS_PASS" >> "$PROPS_FILE" # <- never reached if file missing
fi
fi
```

The intent appears to have been "if a previous props file exists, reuse its passphrase; otherwise use the one provided as `$3`" - and on the otherwise path, write `$3` into a fresh file. But the *write* is also inside the gate, so on a fresh host the new passphrase is never persisted. The script does proceed (it has `KS_PASS` from arg `$3` so `keytool -genkey` and `keytool -certreq` work), so `cloud.jks` and `cloud.csr` come out fine. The trailing `chmod 600 "$PROPS_FILE"` fails with `chmod: cannot access '/etc/cloudstack/agent/agent.properties': No such file or directory` to stderr, but that's swallowed via `|| $LOGGER_CMD ...` and the script's final exit status is the logger's (always 0). MS reads the CSR from stdout and proceeds.

The next stage (`keystore-cert-import`, called with all 10 args correctly populated by `setupAgentSecurity()`) then reads passphrase from `agent.properties`:

```bash
KS_PASS=$(sed -n '/keystore.passphrase/p' "$PROPS_FILE" 2>/dev/null | sed 's/keystore.passphrase=//g' 2>/dev/null)

if [ -z "${KS_PASS// }" ]; then
echo "Failed to find keystore passphrase from file: $PROPS_FILE, quitting!"
exit 1
fi
```

(Note: arg `$2` `KS_PASS` is overwritten here on the KVM path - the arg `$2` is only honoured inside the `[ ! -f "$LIBVIRTD_FILE" ]` systemvm branch above. So the file is the only source of truth on KVM agents.)

`KS_PASS` ends up empty, script exits 1.

`setupAgentSecurity()` retries three times (each attempt deterministically the same since the bug is reproduced from clean state on every retry), then throws.

### evidence

`bash -x` trace of `keystore-cert-import` on the agent during a failing `addHost`, captured by wrapping the upstream script with a tracing shim:

```
+ '[' '!' -f /etc/libvirt/libvirtd.conf ']'
++ sed -n /keystore.passphrase/p /etc/cloudstack/agent/agent.properties
++ sed s/keystore.passphrase=//g
+ KS_PASS=
+ '[' -z '' ']'
+ echo 'Failed to find keystore passphrase from file: /etc/cloudstack/agent/agent.properties, quitting!'
+ exit 1
```

State of `/etc/cloudstack/agent/` immediately after `keystore-setup` returned (note the missing `agent.properties` despite the script having "succeeded"):

```
total 24
-rwxr-xr-x 1 root root 904 Nov 7 environment.properties <- package
-rwxr-xr-x 1 root root 2601 Nov 7 log4j-cloud.xml <- package
-rw------- 1 root root 2742 ... cloud.jks <- created by keystore-setup
<- agent.properties NOT created
<- cloud.csr written + cat'd to stdout (consumed by MS)
```

Argument-count verification on the agent side (instrumented script logging argc/argv on entry):

```
keystore-setup argc=5 argv=[/etc/cloudstack/agent/agent.properties /etc/cloudstack/agent/cloud.jks <16-char-random> 365 /etc/cloudstack/agent/cloud.csr]
keystore-cert-import argc=10 arg6_len=1696 arg8_len=1814 arg10_len=0
```

So `setupAgentSecurity()` is sending all 5 / 10 args correctly - the dispatch side is fine. The defect is purely inside `scripts/util/keystore-setup`.

`management-server.log` for the same `addHost` attempt - three back-to-back invocations of `keystore-cert-import`, all returning the same "Failed to find keystore passphrase" output, then the wrapper exception:

```
... DEBUG c.c.u.s.SSHCmdHelper Executing cmd: sudo /usr/share/cloudstack-common/scripts/util/keystore-cert-import ...
... DEBUG c.c.u.s.SSHCmdHelper SSH command output: Failed to find keystore passphrase from file: /etc/cloudstack/agent/agent.properties, quitting!
... [retry 2: same output]
... [retry 3: same output]
... WARN c.c.h.k.d.KvmServerDiscoverer can't setup agent, due to com.cloud.utils.exception.CloudRuntimeException: Failed to setup certificate in the KVM agent's keystore file, please see logs and configure manually!
```

### versions

- Apache CloudStack 4.22.0.0 (apache packaging, apt install)
- Hypervisor: KVM
- Agent host OS: Ubuntu Server 24.04 LTS, OpenJDK 17
- Management server OS: Ubuntu Server 24.04 LTS, OpenJDK 17, CA framework `provider.plugin=root`
- Agent dir before addHost: only `environment.properties` + `log4j-cloud.xml` (i.e. the natural state right after `apt install cloudstack-agent` on a fresh host that has not yet been registered)

### steps to reproduce

1. Install `cloudstack-management` 4.22.0.0 on a clean host. Bootstrap CA (default - `ca.framework.provider.plugin=root` works fine for this; not the issue).
2. Install `cloudstack-agent` 4.22.0.0 on a clean KVM host. Verify `/etc/cloudstack/agent/` contains only `environment.properties` + `log4j-cloud.xml` (the package-shipped files).
3. Stop `cloudstack-agent` on the KVM host (so no startup process can pre-create state).
4. From the management server, dispatch `addHost` for the KVM host - e.g. via `cmk add host` or `ngine_io.cloudstack.cs_host`.
5. Observe failure with `errortext: 'Could not add host at [http://...] ... due to: [ can't setup agent, due to com.cloud.utils.exception.CloudRuntimeException: Failed to setup certificate in the KVM agent's keystore file, please see logs and configure manually!]'`.
6. SSH to the KVM host as root and inspect:
- `/etc/cloudstack/agent/cloud.jks` exists (created by `keystore-setup`)
- `/etc/cloudstack/agent/cloud.csr` does *not* exist on disk after the call (consumed by MS via stdout, then trailing `chmod` fails silently - this is a separate cosmetic issue)
- `/etc/cloudstack/agent/agent.properties` does **not** exist - this is the bug
7. Re-running `addHost` after manually creating `agent.properties` with a `keystore.passphrase=` line lets the second invocation succeed, because `keystore-setup`'s `if [ -f "$PROPS_FILE" ]` gate now passes and the existing passphrase is reused. This is a workable manual workaround per host.

### what to do about it

**Primary - patch `scripts/util/keystore-setup` to ensure `PROPS_FILE` exists before the passphrase-write branch.** Two-block change, restructure the gate so the file is created if missing, then the passphrase is always either reused or written:

```diff
-# Re-use existing password or use the one provided
-if [ -f "$PROPS_FILE" ]; then
- $LOGGER_CMD "Previous props file exists, trying to extract password"
- OLD_PASS=$(sed -n '/^keystore.passphrase/p' "$PROPS_FILE" | sed 's/^keystore.passphrase=//g')
- if [ -n "${OLD_PASS// }" ]; then
- KS_PASS="$OLD_PASS"
- $LOGGER_CMD "Password extraction successful"
- else
- sed -i "/^keystore.passphrase.*/d" "$PROPS_FILE" 2>&1 | $LOGGER_CMD || true
- echo "keystore.passphrase=$KS_PASS" >> "$PROPS_FILE"
- if [ $? != 0 ]; then
- $LOGGER_CMD "Could not add new password to agent.properties"
- else
- $LOGGER_CMD "New keystore password set"
- fi
- fi
-fi
+# Ensure props file exists, then re-use existing passphrase or persist the one provided.
+if [ ! -f "$PROPS_FILE" ]; then
+ touch "$PROPS_FILE"
+ chmod 600 "$PROPS_FILE"
+ $LOGGER_CMD "Created new props file at $PROPS_FILE"
+fi
+
+OLD_PASS=$(sed -n '/^keystore.passphrase/p' "$PROPS_FILE" | sed 's/^keystore.passphrase=//g')
+if [ -n "${OLD_PASS// }" ]; then
+ KS_PASS="$OLD_PASS"
+ $LOGGER_CMD "Password extraction successful"
+else
+ sed -i "/^keystore.passphrase.*/d" "$PROPS_FILE" 2>&1 | $LOGGER_CMD || true
+ echo "keystore.passphrase=$KS_PASS" >> "$PROPS_FILE"
+ if [ $? != 0 ]; then
+ $LOGGER_CMD "Could not add new password to agent.properties"
+ else
+ $LOGGER_CMD "New keystore password set"
+ fi
+fi
```

After this, fresh-host KVM `addHost` works first try. Re-runs are idempotent (existing passphrase reused).

**Secondary - harden `scripts/util/keystore-cert-import` to fail loudly instead of `exit 0` in error branches.** Same script has bare `exit` (no status) in two error branches, which return exit code 0 and let the MS see `SSHCmdResult.isSuccess()=true` even when nothing was imported:

```diff
# Import certificate
if [ ! -z "${CERT// }" ]; then
echo "$CERT" > "$CERT_FILE"
elif [ ! -f "$CERT_FILE" ]; then
- echo "Cannot find certificate file: $CERT_FILE, exiting"
- exit
+ echo "Cannot find certificate file: $CERT_FILE, exiting" >&2
+ exit 1
fi

# Import ca certs
if [ ! -z "${CACERT// }" ]; then
echo "$CACERT" > "$CACERT_FILE"
elif [ ! -f "$CACERT_FILE" ]; then
- echo "Cannot find ca certificate file: $CACERT_FILE, exiting!"
- exit
+ echo "Cannot find ca certificate file: $CACERT_FILE, exiting!" >&2
+ exit 1
fi
```

`exit 1` (with status) lets `SSHCmdResult.isSuccess()` correctly return false, and the existing 3-retry-then-throw loop in `setupAgentSecurity()` will surface the real failure to the operator instead of leaving the agent with a broken keystore that only manifests later as runtime TLS handshake errors.

### relationship to #13064

This is a **sibling defect**, not the same one as #13064 - same script family, same general class of silent-failure footguns, but a different trigger and a different downstream symptom:

| | this issue | #13064 |
|---|---|---|
| Hypervisor | KVM | VMware |
| Triggered by | fresh KVM agent in `addHost` (no prior `agent.properties`) | VMware SSH dispatch of `SetupCertificateCommand` to a SystemVM |
| Buggy script | `keystore-setup` (passphrase-write gated on file existing) | `keystore-cert-import` (bare `exit` in error branch) |
| Args sent by MS | all 5 / 10 args correct | only 6 of 10 args (`$7`/`$8` CACERT missing on the VMware path) |
| Exit code from script | exit 1 (loud failure) | exit 0 (silent success masking real failure) |
| Downstream symptom | `setupAgentSecurity()` throws "Failed to setup certificate in the KVM agent's keystore file" | agent's `cloud.jks` ends up missing the trustedCertEntry; agent later fails TLS handshake to MS:8250 with `certificate_unknown` |
| Surface time | immediate, on first `addHost` | minutes later, once the agent actually tries to connect |

The proposed Secondary fix above (replacing bare `exit` with `exit 1`) addresses one half of #13064 - once those branches return non-zero, the MS `setupAgentSecurity()` retry-and-throw loop will surface the VMware-dispatch arg-count bug as a proper failure instead of letting the silent-success continue to hide it. The actual primary fix for #13064 (passing CACERT args from the VMware SSH dispatch path) is independent of this change and orthogonal.

### operator workaround (until upstream fix lands)

Replace `/usr/share/cloudstack-common/scripts/util/keystore-setup` on each KVM agent with a thin wrapper that pre-creates `agent.properties` with the passphrase from arg `$3` before exec'ing the original. Originals preserved as `.orig`:

```bash
#!/bin/bash
# Workaround for upstream keystore-setup not creating agent.properties on
# fresh hosts. See .
if [ $# -ge 5 ]; then
PROPS_FILE="$1"
KS_PASS="$3"
if [ ! -f "$PROPS_FILE" ]; then
touch "$PROPS_FILE"
chmod 600 "$PROPS_FILE"
fi
EXISTING=$(sed -n '/^keystore\.passphrase=/p' "$PROPS_FILE" | head -1 | sed 's/^keystore\.passphrase=//')
if [ -z "${EXISTING// }" ]; then
echo "keystore.passphrase=$KS_PASS" >> "$PROPS_FILE"
fi
exec /usr/share/cloudstack-common/scripts/util/keystore-setup.orig "$@"
fi
exec /usr/share/cloudstack-common/scripts/util/keystore-setup.orig "$@"
```

Verified working on Ubuntu 24.04 + CloudStack 4.22.0.0 KVM - `addHost` succeeds first try after the wrapper is in place and the agent dir is wiped to clean state.

从 scripts/util/keystore-setup 开始，跟踪它在全新的 KVM addHost 过程中如何处理缺少 agent.properties 的情况。将 passphrase 的处理与 scripts/util/keystore-cert-import 以及 setupAgentSecurity() 的重试路径进行比较。当一个全新的 agent 持久化 passphrase 并完成 addHost，同时文档中说明的 certificate-import 错误分支返回失败时，即表示完成；请使用干净主机上的复现步骤进行验证。

由索引模型根据 Issue 内容生成。