appimage downgrading

bauh/gems/appimage/controller.py

@@ -85,7 +85,41 @@ class AppImageManager(SoftwareManager):
         return res
 
     def downgrade(self, pkg: AppImage, root_password: str, watcher: ProcessWatcher) -> bool:
-        pass
+        versions = self.get_history(pkg)
+
+        if len(versions.history) == 1:
+            watcher.show_message(title=self.i18n['appimage.downgrade.impossible.title'],
+                                 body=self.i18n['appimage.downgrade.impossible.body'].format(bold(pkg.name)),
+                                 type_=MessageType.ERROR)
+            return False
+        elif versions.pkg_status_idx == -1:
+            watcher.show_message(title=self.i18n['appimage.downgrade.impossible.title'],
+                                 body=self.i18n['appimage.downgrade.unknown_version.body'].format(bold(pkg.name)),
+                                 type_=MessageType.ERROR)
+            return False
+        elif versions.pkg_status_idx == len(versions.history) - 1:
+            watcher.show_message(title=self.i18n['appimage.downgrade.impossible.title'],
+                                 body=self.i18n['appimage.downgrade.first_version'].format(bold(pkg.name)),
+                                 type_=MessageType.ERROR)
+            return False
+        else:
+            if self.uninstall(pkg, root_password, watcher):
+                old_release = versions.history[versions.pkg_status_idx + 1]
+                pkg.version = old_release['0_version']
+                pkg.url_download = old_release['2_url_download']
+                if self.install(pkg, root_password, watcher):
+                    self.cache_to_disk(pkg, None, False)
+                    return True
+                else:
+                    watcher.show_message(title=self.i18n['error'],
+                                         body=self.i18n['appimage.downgrade.install_version'].format(bold(pkg.version), bold(pkg.url_download)),
+                                         type_=MessageType.ERROR)
+            else:
+                watcher.show_message(title=self.i18n['error'],
+                                     body=self.i18n['appimage.downgrade.uninstall_current_version'].format(bold(pkg.name)),
+                                     type_=MessageType.ERROR)
+
+            return False
 
     def update(self, pkg: AppImage, root_password: str, watcher: ProcessWatcher) -> SystemProcess:
         pass

bauh/gems/appimage/model.py

@@ -35,8 +35,7 @@ class AppImage(SoftwarePackage):
         return True
 
     def can_be_downgraded(self):
-        # TODO
-        return False
+        return self.installed
 
     def get_type(self):
         return 'AppImage'

bauh/gems/appimage/resources/locale/en

@@ -7,4 +7,10 @@ appimage.info.url_download=File URL
 appimage.info.icon_path=icon
 appimage.history.0_version=version
 appimage.history.1_published_at=date
-appimage.history.2_url_download=File URL
+appimage.history.2_url_download=File URL
+appimage.downgrade.impossible.title=Impossible to downgrade
+appimage.downgrade.impossible.body={} has only one published version.
+appimage.downgrade.unknown_version.body=It was not possible to identify {} current version in its versions history
+appimage.downgrade.first_version={} is in its first published version
+appimage.downgrade.uninstall_current_version=It was not possible to uninstall the current version of {}
+appimage.downgrade.install_version=It was not possible to install the version {} ({})

bauh/gems/appimage/resources/locale/es

@@ -7,4 +7,10 @@ appimage.info.url_download=URL del archivo
 appimage.info.icon_path=icono
 appimage.history.0_version=versión
 appimage.history.1_published_at=fecha
-appimage.history.2_url_download=URL del archivo
+appimage.history.2_url_download=URL del archivo
+appimage.downgrade.impossible.title=Imposible revertir la versión
+appimage.downgrade.impossible.body={} solo tiene una versión publicada.
+appimage.downgrade.unknown_version.body=No fue posible identificar la versión actual de {} en su historial de versiones
+appimage.downgrade.first_version={} está en su primera versión publicada
+appimage.downgrade.uninstall_current_version=No fue posible desinstalar la versión actual de {}
+appimage.downgrade.install_version=No fue posible instalar la versión {} ({})

bauh/gems/appimage/resources/locale/pt

@@ -7,4 +7,10 @@ appimage.info.url_download=URL do arquivo
 appimage.info.icon_path=ícone
 appimage.history.0_version=versão
 appimage.history.1_published_at=data
-appimage.history.2_url_download=URL do arquivo
+appimage.history.2_url_download=URL do arquivo
+appimage.downgrade.impossible.title=Impossível reverter a versão
+appimage.downgrade.impossible.body={} tem somente uma versão publicada.
+appimage.downgrade.unknown_version.body=Não foi possível identificar a versão atual de {} no seu histórico de versões
+appimage.downgrade.first_version={} se encontra em sua primeira versão publicada
+appimage.downgrade.uninstall_current_version=Não foi possível desinstalar a versão atual de {}
+appimage.downgrade.install_version=Não foi possivel instalar a versão {} ({})