Add build_entry_path(), Copy of imag-store/src/util/build_entry_path()

imag-tag/src/util.rs

@@ -0,0 +1,36 @@
+use std::path::PathBuf;
+
+use semver::Version;
+
+use libimagrt::runtime::Runtime;
+
+pub fn build_entry_path(rt: &Runtime, path_elem: &str) -> PathBuf {
+    debug!("Checking path element for version");
+    {
+        let contains_version = {
+            path_elem.split("~")
+                .last()
+                .map(|version| Version::parse(version).is_ok())
+                .unwrap_or(false)
+        };
+
+        if !contains_version {
+            debug!("Version cannot be parsed inside {:?}", path_elem);
+            warn!("Path does not contain version. Will panic now!");
+            panic!("No version in path");
+        }
+    }
+    debug!("Version checking succeeded");
+
+    debug!("Building path from {:?}", path_elem);
+    let mut path = rt.store().path().clone();
+
+    if path_elem.chars().next() == Some('/') {
+        path.push(&path_elem[1..path_elem.len()]);
+    } else {
+        path.push(path_elem);
+    }
+
+    path
+}
+