java - Inno 安装程序 : Removing files installed by previous version

Question

我正在使用 Inno Setup为 Windows 打包 Java 应用程序；应用程序树是这样的:

|   MyApp.jar
\---lib
    |   dependency-A-1.2.3.jar
    |   dependency-B-2.3.4.jar
    |   dependency-Z-x.y.z.jar

我使用 Ant预先准备整个树(所有文件和文件夹)，包括 lib 目录(使用 *.jar 通配符复制依赖项)，然后我只需调用 ISCC 与:

[Files]
Source: "PreparedFolder\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs

现在，我需要在每次用户升级应用程序时清理 lib 目录，因为我想删除任何过时的依赖项。我可以将以下部分添加到我的 .iss 文件中:

[InstallDelete]
{app}\lib\*.jar

但我感觉不安全，因为如果用户决定将应用程序安装在包含非空 lib 子文件夹的现有文件夹中(很少见但并非不可能)，则有可能一些用户文件在升级时被删除。

有什么最佳实践可以避免这种麻烦吗？其他安装人员会解决这些令人头疼的问题吗？谢谢。

Answer 1

您可以在安装前卸载之前的版本:

• Inno Setup: How to automatically uninstall previous installed version?
• How to detect old installation and offer removal?

---

如果您无法完全卸载，则必须实现部分卸载。

理想的做法是对卸载程序日志 (unins000.dat) 进行反向工程，仅将安装提取到 lib 子文件夹并处理(撤消)它们。但由于这是一个未记录的二进制文件，因此可能很难做到。

---

如果您在 [Files] 部分维护要安装的文件的显式列表，例如

[Files]
Source: "lib\dependency-A-1.2.3.jar"; Dest: "{app}\lib"
Source: "lib\dependency-B-2.3.4.jar"; Dest: "{app}\lib"

然后每当依赖项发生变化时，将以前的版本移动到 [InstallDelete] 部分:

[Files]
Source: "lib\dependency-A-1.3.0.jar"; Dest: "{app}"
Source: "lib\dependency-B-2.3.4.jar"; Dest: "{app}"

[InstallDelete]
{app}\lib\dependency-A-1.2.3.jar

---

如果您使用通配符安装依赖项，

[Files]
Source: "lib\*.jar"; Dest: "{app}\lib"

而且您不能对卸载程序日志进行逆向工程，您必须通过自己的方式复制其功能。

您可以使用 preprocessor生成具有已安装依赖项的文件。将该文件安装到 {app} 文件夹并在安装前处理该文件。

[Files]
Source: "MyApp.jar"; DestDir: "{app}"
Source: "lib\*.jar"; DestDir: "{app}\lib"

#define ProcessFile(Source, FindResult, FindHandle) \
    Local[0] = FindGetFileName(FindHandle), \
    Local[1] = Source + "\\" + Local[0], \
    Local[2] = FindNext(FindHandle), \
    "'" + Local[0] + "'#13#10" + \
        (Local[2] ? ProcessFile(Source, Local[2], FindHandle) : "")

#define ProcessFolder(Source) \
    Local[0] = FindFirst(Source + "\\*.jar", faAnyFile), \
    ProcessFile(Source, Local[0], Local[0])

#define DepedenciesToInstall ProcessFolder("lib")
#define DependenciesLog "{app}\dependencies.log"

[UninstallDelete]
Type: files; Name: "{#DependenciesLog}"

[Code]

procedure CurStepChanged(CurStep: TSetupStep);
var
  AppPath, DependenciesLogPath: string;
  Dependencies: TArrayOfString;
  Count, I: Integer;
begin
  DependenciesLogPath := ExpandConstant('{#DependenciesLog}');

  if CurStep = ssInstall then
  begin
    // If dependencies log already exists, 
    // remove the previously installed dependencies
    if LoadStringsFromFile(DependenciesLogPath, Dependencies) then
    begin
      Count := GetArrayLength(Dependencies);
      Log(Format('Loaded %d dependencies, deleting...', [Count]));
      for I := 0 to Count - 1 do
        DeleteFile(ExpandConstant('{app}\lib\' + Dependencies[I]));
    end;
  end
    else
  if CurStep = ssPostInstall then
  begin
    // Now that the app folder already exists,
    // save dependencies log (to be processed by future upgrade)
    if SaveStringToFile(DependenciesLogPath, {#DepedenciesToInstall}, False) then
    begin
      Log('Created dependencies log');
    end
      else
    begin
      Log('Failed to create dependencies log');
    end;
  end;
end;

---

另一种方法是删除安装文件夹中所有未被最新安装程序安装的文件。

最简单的解决方案是在安装前删除安装文件夹中的所有文件。

您可以使用 [InstallDelete] section为了那个原因。但是如果你在安装文件夹中有一些配置的文件夹/文件，它不会允许你排除它们。

您可以改为编写 Pascal 脚本。参见 Inno Setup - Delete whole application folder except for data subdirectory .您可以从我对 CurStepChanged(ssInstall) 中那个问题的回答中调用 DelTreeExceptSavesDir 函数事件函数:

procedure CurStepChanged(CurStep: TSetupStep);
begin
  if CurStep = ssInstall then
  begin
    DelTreeExceptSavesDir(WizardDirValue); 
  end;
end;

---

如果您真的只想删除过时的文件，为了避免删除和重新创建现有文件，您可以使用预处理器生成要为 Pascal 脚本安装的文件列表，并使用它来仅删除真正过时的文件。

#pragma parseroption -p-

#define FileEntry(DestDir) \
    "  FilesNotToBeDeleted.Add('" + LowerCase(DestDir) + "');\n"

#define ProcessFile(Source, Dest, FindResult, FindHandle) \
    FindResult \
        ? \
            Local[0] = FindGetFileName(FindHandle), \
            Local[1] = Source + "\\" + Local[0], \
            Local[2] = Dest + "\\" + Local[0], \
            (Local[0] != "." && Local[0] != ".." \
                ? FileEntry(Local[2]) + \
                  (DirExists(Local[1]) ? ProcessFolder(Local[1], Local[2]) : "") \
                : "") + \
            ProcessFile(Source, Dest, FindNext(FindHandle), FindHandle) \
        : \
            ""

#define ProcessFolder(Source, Dest) \
    Local[0] = FindFirst(Source + "\\*", faAnyFile), \
    ProcessFile(Source, Dest, Local[0], Local[0])

#pragma parseroption -p+

[Code]

var
  FilesNotToBeDeleted: TStringList;

function InitializeSetup(): Boolean;
begin
  FilesNotToBeDeleted := TStringList.Create;
  FilesNotToBeDeleted.Add('\data');
  {#Trim(ProcessFolder('build\exe.win-amd64-3.6', ''))}
  FilesNotToBeDeleted.Sorted := True;

  Result := True;
end;

procedure DeleteObsoleteFiles(Path: string; RelativePath: string);
var
  FindRec: TFindRec;
  FilePath: string;
  FileRelativePath: string;
begin
  if FindFirst(Path + '\*', FindRec) then
  begin
    try
      repeat
        if (FindRec.Name <> '.') and (FindRec.Name <> '..') then
        begin
          FilePath := Path + '\' + FindRec.Name;
          FileRelativePath := RelativePath + '\' + FindRec.Name;
          if FindRec.Attributes and FILE_ATTRIBUTE_DIRECTORY <> 0 then
          begin
            DeleteObsoleteFiles(FilePath, FileRelativePath);
          end;

          if FilesNotToBeDeleted.IndexOf(Lowercase(FileRelativePath)) < 0 then
          begin
            if FindRec.Attributes and FILE_ATTRIBUTE_DIRECTORY <> 0 then
            begin
              if RemoveDir(FilePath) then
              begin
                Log(Format('Deleted obsolete directory %s', [FilePath]));
              end
                else
              begin
                Log(Format('Failed to delete obsolete directory %s', [FilePath]));
              end;
            end
              else
            begin
              if DeleteFile(FilePath) then
              begin
                Log(Format('Deleted obsolete file %s', [FilePath]));
              end
                else
              begin
                Log(Format('Failed to delete obsolete file %s', [FilePath]));
              end;
            end;
          end;
        end;
      until not FindNext(FindRec);
    finally
      FindClose(FindRec);
    end;
  end
    else
  begin
    Log(Format('Failed to list %s', [Path]));
  end;
end;

procedure CurStepChanged(CurStep: TSetupStep);
begin
  if CurStep = ssInstall then
  begin
    Log('Looking for obsolete files...');
    DeleteObsoleteFiles(WizardDirValue, '');
  end;
end;