Add `any` arch; Add `archive_name` method for `Package`; Ensure

architecture matches when checking if a package is an upgrade;

src/package/arch.rs

@@ -22,6 +22,7 @@ pub enum Arch {
     i686,
     riscv64,
     x86_64,
+    any,
 }
 
 impl Default for Arch {
@@ -40,6 +41,7 @@ impl fmt::Display for Arch {
             Self::i686 => "i686",
             Self::riscv64 => "riscv64",
             Self::x86_64 => "x86_64",
+            Self::any => "any",
         })
     }
 }
@@ -66,6 +68,7 @@ impl FromStr for Arch {
             "armv7l" | "arm" => Ok(Self::armv7l),
             "arm64" | "aarch64" | "armv8" => Ok(Self::aarch64),
             "riscv" | "riscv64" => Ok(Self::riscv64),
+            "any" => Ok(Self::any),
             _ => Err(ParseArchError)
         }
     }

src/package/mod.rs

@@ -113,12 +113,18 @@ impl Package {
 
     /// Returns the formatted full package name including version and release strings
     pub fn fullname(&self) -> String {
-        format!("{}-{}_{}{}", self.name, self.version, self.arch, self.release)
+        format!("{}-{}_{}_{}", self.name, self.version, self.release, self.arch)
+    }
+
+    /// Returns the name of the package archive
+    pub fn archive_name(&self) -> String {
+        format!("{}-{}_{}_{}.tar.zstd", self.name, self.version, self.release, self.arch)
     }
 
     /// Tests whether this package is an update for another
     pub fn is_upgrade(&self, other: &Self) -> bool {
-        self.name == other.name
+        self.arch == other.arch
+            && self.name == other.name
             && (self.version > other.version
                 || (self.version == other.version && self.release > other.release))
     }