If POM is set up to mirror the PVE repository and only this repository
is added on a PVE host, the `Repositories` panel will show an `Error`
status with the message:

`No Proxmox VE repository is enabled, you do not get any updates!`

This is because the current implementation only checks if the uri of
the repo matches that of one of the standard repos.

This patch aims to fix this issue by verifying it through signage
info via gpgv. Checking against the cached InRelease file at
`/var/lib/apt/lists/` with the help of the function `release_filename`
to encode the uri into the filename generated by APT's URItoFileName
in contrib/strutl.cc.

Added tests to ensure common file paths for POM would be encoded
correctly.

Fixes: https://bugzilla.proxmox.com/show_bug.cgi?id=5207
Signed-off-by: Nicolas Frey <[email protected]>
---
 proxmox-apt/src/repositories/repository.rs | 50 ++++++++++++++++++++--
 1 file changed, 46 insertions(+), 4 deletions(-)

diff --git a/proxmox-apt/src/repositories/repository.rs 
b/proxmox-apt/src/repositories/repository.rs
index 24e7943b..a460f5e7 100644
--- a/proxmox-apt/src/repositories/repository.rs
+++ b/proxmox-apt/src/repositories/repository.rs
@@ -122,18 +122,20 @@ impl APTRepositoryImpl for APTRepository {
         product: &str,
         suite: &str,
     ) -> bool {
-        let (package_type, handle_uris, component, _key) = 
handle.info(product);
+        let (package_type, handle_uris, component, key) = handle.info(product);
 
-        let mut found_uri = false;
+        let mut found_uri_or_signed = false;
 
         for uri in self.uris.iter() {
             let uri = uri.trim_end_matches('/');
 
-            found_uri = found_uri || handle_uris.iter().any(|handle_uri| 
handle_uri == uri);
+            found_uri_or_signed = found_uri_or_signed
+                || handle_uris.iter().any(|handle_uri| handle_uri == uri)
+                || gpg_signed(uri, suite, key);
         }
 
         self.types.contains(&package_type)
-            && found_uri
+            && found_uri_or_signed
             // using contains would require a &String
             && self.suites.iter().any(|self_suite| self_suite == suite)
             && self.components.contains(&component)
@@ -389,8 +391,48 @@ fn write_stanza(repo: &APTRepository, w: &mut dyn Write) 
-> Result<(), Error> {
     Ok(())
 }
 
+fn gpg_signed(uri: &str, suite: &str, key: &str) -> bool {
+    release_filename(Path::new("/var/lib/apt/lists"), uri, suite, false)
+        .to_str()
+        .is_some_and(|cached_file| {
+            std::process::Command::new("gpgv")
+                .args(["--keyring", key, cached_file])
+                .output()
+                .is_ok_and(|output| output.status.success())
+        })
+}
+
 #[test]
 fn test_uri_to_filename() {
     let filename = uri_to_filename("https://some_host/some/path";);
     assert_eq!(filename, "some%5fhost_some_path".to_string());
 }
+
+#[test]
+fn test_release_filename() {
+    let data = [
+        // testcase for proxmox offline mirror (mounted)
+        (
+            Path::new("/var/lib/apt/lists"),
+            "file:///mnt/mirror/pve-no-subscription/2025-10-16T08:07:41Z",
+            "trixie",
+            false,
+            // expected
+            
"/var/lib/apt/lists/_mnt_mirror_pve-no-subscription_2025-10-16T08:07:41Z_dists_trixie_InRelease"
+        ),
+        // testcase for proxmox offline mirror (local http server)
+        (
+            Path::new("/var/lib/apt/lists"),
+            
"http://proxmox-offline-mirror.domain.example/pve-subscription/2025-10-16T08:07:41Z";,
+            "trixie",
+            false,
+            // expected
+            
"/var/lib/apt/lists/proxmox-offline-mirror.domain.example_pve-subscription_2025-10-16T08:07:41Z_dists_trixie_InRelease"
+        ),
+    ];
+
+    for d in data {
+        let filename = release_filename(d.0, d.1, d.2, d.3).to_str();
+        assert_eq!(filename, Some(d.4));
+    }
+}
-- 
2.47.3


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