Tests: retry the version probe of a script a test just wrote (ETXTBSY) (#848)

reads_binary_version_when_the_cli_uses_the_display_name_or_a_former_id
failed now and then: another test thread that forks while the script is
still open for writing holds that descriptor until it execs, and running
the script in that window fails with ETXTBSY. Both binary_version tests
now retry a miss for up to a second.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/native/src/detect.rs

@@ -481,6 +481,19 @@ mod linux_tests {
         assert!(linux::pacman_db_present(&root.path().join("local")));
     }
 
+    /// `linux::binary_version` on a script the test just wrote. Another test thread that forks
+    /// while the script is still open for writing holds that descriptor until it execs, and running
+    /// the script in that window fails with ETXTBSY ("Text file busy"), so a miss is retried.
+    fn binary_version_of_new_script(bin: &Path, app: &CraftApp) -> Option<version::Version> {
+        for _ in 0..20 {
+            if let Some(v) = linux::binary_version(bin, app) {
+                return Some(v);
+            }
+            std::thread::sleep(std::time::Duration::from_millis(50));
+        }
+        None
+    }
+
     #[test]
     fn reads_binary_version_from_cli() {
         let photo = CraftApp::by_id("photocraft").unwrap();
@@ -489,7 +502,7 @@ mod linux_tests {
         std::fs::write(&bin, "#!/bin/sh\necho 'photocraft 0.6.0 (0c72d9542, 2026-10-10)'\n").unwrap();
         use std::os::unix::fs::PermissionsExt;
         std::fs::set_permissions(&bin, std::fs::Permissions::from_mode(0o755)).unwrap();
-        let ver = linux::binary_version(&bin, photo);
+        let ver = binary_version_of_new_script(&bin, photo);
         assert_eq!(ver.unwrap().to_string(), "0.6.0");
     }
 
@@ -504,9 +517,9 @@ mod linux_tests {
             bin
         };
         let sound = write("soundcraft", "#!/bin/sh\necho 'SoundCraft 0.5.0'\n");
-        assert_eq!(linux::binary_version(&sound, CraftApp::by_id("soundcraft").unwrap()).unwrap().to_string(), "0.5.0");
+        assert_eq!(binary_version_of_new_script(&sound, CraftApp::by_id("soundcraft").unwrap()).unwrap().to_string(), "0.5.0");
         let pdf = write("pdfcraft", "#!/bin/sh\necho 'printcraft 0.2.1'\n");
-        assert_eq!(linux::binary_version(&pdf, CraftApp::by_id("pdfcraft").unwrap()).unwrap().to_string(), "0.2.1");
+        assert_eq!(binary_version_of_new_script(&pdf, CraftApp::by_id("pdfcraft").unwrap()).unwrap().to_string(), "0.2.1");
     }
 }