This has been deprecated in PVE 8.4-1 and PBS 3.4-1, respectively. No
PMG release to date with this change.

The kebab-case style is preferred for all new things.

Migration for users is pretty simple, for both hand-written answer files
as well as on-the-fly generated ones by automated provisioning tools and
such - basically a s/_/-/.

Signed-off-by: Christoph Heiss <c.he...@proxmox.com>
---
Would be nice to drop them with the next major release, but if there are
reasons for keeping it around for another major, disregard this patch.

 proxmox-auto-install-assistant/src/main.rs      |  6 +++---
 proxmox-auto-installer/src/answer.rs            | 17 ++++-------------
 proxmox-auto-installer/tests/parse-answer.rs    |  3 ++-
 .../parse_answer_fail/underscore_keys.json      |  3 +++
 .../parse_answer_fail/underscore_keys.toml      | 14 ++++++++++++++
 5 files changed, 26 insertions(+), 17 deletions(-)
 create mode 100644 
proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.json
 create mode 100644 
proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.toml

diff --git a/proxmox-auto-install-assistant/src/main.rs 
b/proxmox-auto-install-assistant/src/main.rs
index add5053..fc8e9b2 100644
--- a/proxmox-auto-install-assistant/src/main.rs
+++ b/proxmox-auto-install-assistant/src/main.rs
@@ -299,7 +299,7 @@ fn validate_answer_file_keys(path: impl AsRef<Path> + 
fmt::Debug) -> Result<bool
             for (k, v) in t {
                 if k.contains('_') {
                     eprintln!(
-                        "Warning: Section [{}] contains deprecated key `{k}`, 
use `{}` instead.",
+                        "Error: Section [{}] contains key `{k}` which has been 
removed, use `{}` instead.",
                         section.join("."),
                         k.replace("_", "-")
                     );
@@ -318,8 +318,8 @@ fn validate_answer_file_keys(path: impl AsRef<Path> + 
fmt::Debug) -> Result<bool
         Ok(true)
     } else {
         eprintln!(
-            "Warning: Answer file is using deprecated underscore keys. \
-            Since PVE 8.4-1 and PBS 3.4-1, kebab-case style keys are now 
preferred."
+            "Error: Answer file is using underscore keys, which have been 
removed. \
+            Since PVE 8.4-1 and PBS 3.4-1, kebab-case style keys are now 
preferred and mandantory since PVE 9.0-1."
         );
         Ok(false)
     }
diff --git a/proxmox-auto-installer/src/answer.rs 
b/proxmox-auto-installer/src/answer.rs
index d0d5b78..c631b1b 100644
--- a/proxmox-auto-installer/src/answer.rs
+++ b/proxmox-auto-installer/src/answer.rs
@@ -10,9 +10,6 @@ use proxmox_installer_common::{
 use serde::{Deserialize, Serialize};
 use std::{collections::BTreeMap, io::BufRead, net::IpAddr};
 
-// NOTE New answer file properties must use kebab-case, but should allow 
snake_case for backwards
-// compatibility. TODO Remove the snake_cased variants in a future major 
version (e.g. PVE 10).
-
 // BTreeMap is used to store filters as the order of the filters will be 
stable, compared to
 // storing them in a HashMap
 
@@ -51,15 +48,13 @@ pub struct Global {
     pub keyboard: KeyboardLayout,
     pub mailto: String,
     pub timezone: String,
-    #[serde(alias = "root_password")]
     pub root_password: Option<String>,
-    #[serde(alias = "root_password_hashed")]
     pub root_password_hashed: Option<String>,
-    #[serde(alias = "reboot_on_error", default)]
+    #[serde(default)]
     pub reboot_on_error: bool,
-    #[serde(alias = "reboot_mode", default)]
+    #[serde(default)]
     pub reboot_mode: RebootMode,
-    #[serde(alias = "root_ssh_keys", default)]
+    #[serde(default)]
     pub root_ssh_keys: Vec<String>,
 }
 
@@ -110,7 +105,6 @@ pub struct PostNotificationHookInfo {
     /// URL to send a POST request to
     pub url: String,
     /// SHA256 cert fingerprint if certificate pinning should be used.
-    #[serde(alias = "cert_fingerprint")]
     pub cert_fingerprint: Option<String>,
 }
 
@@ -168,7 +162,6 @@ pub struct FirstBootHookInfo {
     /// Retrieve the post-install script from a URL, if source == "from-url".
     pub url: Option<String>,
     /// SHA256 cert fingerprint if certificate pinning should be used, if 
source == "from-url".
-    #[serde(alias = "cert_fingerprint")]
     pub cert_fingerprint: Option<String>,
 }
 
@@ -262,10 +255,9 @@ pub struct NetworkManual {
 #[serde(rename_all = "kebab-case", deny_unknown_fields)]
 pub struct DiskSetup {
     pub filesystem: Filesystem,
-    #[serde(alias = "disk_list", default)]
+    #[serde(default)]
     pub disk_list: Vec<String>,
     pub filter: Option<BTreeMap<String, String>>,
-    #[serde(alias = "filter_match")]
     pub filter_match: Option<FilterMatch>,
     pub zfs: Option<ZfsOptions>,
     pub lvm: Option<LvmOptions>,
@@ -385,7 +377,6 @@ pub enum Filesystem {
 pub struct ZfsOptions {
     pub raid: Option<ZfsRaidLevel>,
     pub ashift: Option<usize>,
-    #[serde(alias = "arc_max")]
     pub arc_max: Option<usize>,
     pub checksum: Option<ZfsChecksumOption>,
     pub compress: Option<ZfsCompressOption>,
diff --git a/proxmox-auto-installer/tests/parse-answer.rs 
b/proxmox-auto-installer/tests/parse-answer.rs
index 34bc969..f4c3ae8 100644
--- a/proxmox-auto-installer/tests/parse-answer.rs
+++ b/proxmox-auto-installer/tests/parse-answer.rs
@@ -146,7 +146,8 @@ mod tests {
             fqdn_hostname_only,
             no_fqdn_from_dhcp,
             no_root_password_set,
-            short_password
+            short_password,
+            underscore_keys
         );
     }
 }
diff --git 
a/proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.json 
b/proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.json
new file mode 100644
index 0000000..484279d
--- /dev/null
+++ 
b/proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.json
@@ -0,0 +1,3 @@
+{
+    "parse-error": "error parsing answer.toml: unknown field `root_password`, 
expected one of `country`, `fqdn`, `keyboard`, `mailto`, `timezone`, 
`root-password`, `root-password-hashed`, `reboot-on-error`, `reboot-mode`, 
`root-ssh-keys`"
+}
diff --git 
a/proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.toml 
b/proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.toml
new file mode 100644
index 0000000..16f355c
--- /dev/null
+++ 
b/proxmox-auto-installer/tests/resources/parse_answer_fail/underscore_keys.toml
@@ -0,0 +1,14 @@
+[global]
+keyboard = "de"
+country = "at"
+fqdn = "pveauto.testinstall"
+mailto = "mail@no.invalid"
+timezone = "Europe/Vienna"
+root_password = "12345678"
+
+[network]
+source = "from-dhcp"
+
+[disk-setup]
+filesystem = "ext4"
+disk_list = ["sda"]
-- 
2.49.0



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