[pbs-devel] [PATCH v6 proxmox-backup 21/29] fix #3174: specs: add backup detection mode specification

[Christian Ebner <c.ebner@proxmox.com>]

Adds the specification for switching the detection mode used to
identify regular files which changed since a reference backup run.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
Changes since v5:
- fix formatting using `cargo fmt`

 pbs-client/src/backup_specification.rs | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/pbs-client/src/backup_specification.rs b/pbs-client/src/backup_specification.rs
index 619a3a9d..3db1a7a4 100644
--- a/pbs-client/src/backup_specification.rs
+++ b/pbs-client/src/backup_specification.rs
@@ -4,6 +4,7 @@ use proxmox_schema::*;
 
 const_regex! {
     BACKUPSPEC_REGEX = r"^([a-zA-Z0-9_-]+\.(pxar|img|conf|log)):(.+)$";
+    DETECTION_MODE_REGEX = r"^(data|metadata(:[a-zA-Z0-9_-]+\.pxar)*)$";
 }
 
 pub const BACKUP_SOURCE_SCHEMA: Schema =
@@ -11,6 +12,11 @@ pub const BACKUP_SOURCE_SCHEMA: Schema =
         .format(&ApiStringFormat::Pattern(&BACKUPSPEC_REGEX))
         .schema();
 
+pub const BACKUP_DETECTION_MODE_SPEC: Schema =
+    StringSchema::new("Backup source specification ([data|metadata(:<label>,...)]).")
+        .format(&ApiStringFormat::Pattern(&DETECTION_MODE_REGEX))
+        .schema();
+
 pub enum BackupSpecificationType {
     PXAR,
     IMAGE,
@@ -45,3 +51,30 @@ pub fn parse_backup_specification(value: &str) -> Result<BackupSpecification, Er
 
     bail!("unable to parse backup source specification '{}'", value);
 }
+
+pub enum BackupDetectionMode {
+    Data,
+    Metadata(Vec<String>),
+}
+
+pub fn parse_backup_detection_mode_specification(
+    value: &str,
+) -> Result<BackupDetectionMode, Error> {
+    if let Some(caps) = (DETECTION_MODE_REGEX.regex_obj)().captures(value) {
+        let mode = match caps.get(1).unwrap().as_str() {
+            "data" => BackupDetectionMode::Data,
+            ty if ty.starts_with("metadata") => {
+                let archives = ty.split(':').skip(1).map(|s| format!("{s}.didx")).collect();
+                BackupDetectionMode::Metadata(archives)
+            }
+            _ => bail!("invalid backup detection mode"),
+        };
+
+        return Ok(mode);
+    }
+
+    bail!(
+        "unable to parse backup detection mode specification '{}'",
+        value
+    );
+}
-- 
2.39.2