Conflicts and precedence
When including, excluding, and rerouting files and settings, it's important to know how User State Migration Tool (USMT) deals with conflicts and precedence. The following are the most important conflicts and precedence guidelines to keep in mind when working with USMT.
If there are conflicting rules within a component, the most specific rule is applied. However, the <unconditionalExclude> rule is an exception because it takes precedence over all others. Directory names take precedence over file extensions. For examples, see What happens when there are conflicting <include> and <exclude> rules? and the first example in <include> and <exclude> rules precedence examples later in this article.
Only rules inside the same component can affect each other, depending on specificity. Rules that are in different components don't affect each other, except for the <unconditionalExclude> rule.
If the rules are equally specific, <exclude> takes precedence over <include>. For example, if the <exclude> rule is used to exclude a file and use the <include> rule to include the same file, the file is excluded.
The ordering of components does not matter. It doesn't matter which components are listed in which .xml file, because each component is processed independently of the other components across all of the .xml files.
The ordering of the <include> and <exclude> rules within a component does not matter.
The <unconditionalExclude> element can be used to globally exclude data. This element excludes objects, regardless of any other <include> rules that are in the .xml files. For example, the <unconditionalExclude> element can be used to exclude all MP3 files on the computer or to exclude all files from
C:\UserData.
General
What is the relationship between rules that are located within different components?
Only rules inside the same component can affect each other, depending on specificity, except for the <unconditionalExclude> rule. Rules that are in different components don't affect each other. If there's an <include> rule in one component and an identical <exclude> rule in another component, the data is migrated because the two rules are independent of each other.
If an <include> rule is in one component and a <locationModify> rule is in another component for the same file, the file is migrated in both places. That is, the file is included based on the <include> rule, and the file is migrated based on the <locationModify> rule.
The following .xml file migrates all files from C:\Userdocs, including .mp3 files, because the <exclude> rule is specified in a separate component.
<migration urlid="http://www.microsoft.com/migration/1.0/migxmlext/UserDocs">
<component type="Documents" context="System">
<displayName>User Documents</displayName>
<role role="Data">
<rules>
<exclude>
<objectSet>
<pattern type="File">C:\Userdocs\* [*.mp3]</pattern>
</objectSet>
</exclude>
</rules>
</role>
</component>
<component type="Documents" context="System">
<displayName> User documents to include </displayName>
<role role="Data">
<rules>
<include>
<objectSet>
<pattern type="File"> C:\Userdocs\ [*]</pattern>
</objectSet>
</include>
</rules>
</role>
</component>
</migration>
How does precedence work with the Config.xml file?
Specifying migrate="no" in the Config.xml file is the same as deleting the corresponding component from the migration .xml file. However, if migrate="no" is set for the Documents folder, but a rule similar to the following rule exists in a migration .xml file (which includes all of the .doc files from the Documents folder), then only the .doc files is migrated, and all other files are excluded:
<include>
<objectSet>
<pattern type="File">%CSIDL_PERSONAL%\* [*.doc] </pattern>
</objectSet>
</include>
How does USMT process each component in an .xml file with multiple components?
The ordering of components doesn't matter. Each component is processed independently of other components. For example, if an <include> rule is in one component and a <locationModify> rule is in another component for the same file, the file is migrated in both places. That is, the file is included based on the <include> rule, and the file is migrated based on the <locationModify> rule.
How are rules processed?
There are two broad categories of rules.
Rules that affect the behavior of both the ScanState and LoadState tools. For example, the <include>, <exclude>, and <unconditionalExclude> rules are processed for each component in the .xml files. For each component, USMT creates an include list and an exclude list. Some of the rules in the component might be discarded due to specificity, but all of the remaining rules are processed. For each <include> rule, USMT iterates through the elements to see if any of the locations need to be excluded. USMT enumerates all of the objects and creates a list of objects it's going to collect for each user. Once the list is complete, each of the objects is stored or migrated to the destination computer.
Rules that affect the behavior of only the LoadState tool. For example, the <locationModify>, <contentModify>, and <destinationCleanup> rules don't affect ScanState. They're processed only with LoadState. First, the LoadState tool determines the content and location of each component based on the <locationModify> and <contentModify> rules. Then, LoadState processes all of the <destinationCleanup> rules and deletes data from the destination computer. Lastly, LoadState applies the components to the computer.
How does USMT combine all of the .xml files that I specify on the command line?
USMT doesn't distinguish the .xml files based on their name or content. It processes each component within the files separately. USMT supports multiple .xml files only to make it easier to maintain and organize the components within them. Because USMT uses a urlid to distinguish each component from the others, be sure that each .xml file that is specified on the command line has a unique migration urlid.
The <include> and <exclude> rules
What happens when there are conflicting <include> and <exclude> rules?
If there are conflicting rules within a component, the most specific rule is applied, except with the <unconditionalExclude> rule, which takes precedence over all other rules. If the rules are equally specific, then the data isn't migrated. For example if the same file is both excluded and included, the file isn't migrated. If there are conflicting rules within different components, the rules don't affect each other because each component is processed independently.
In the following example, mp3 files aren't excluded from the migration. The mp3 files aren't excluded because directory names take precedence over the file extensions.
<include>
<objectSet>
<pattern type="File">C:\Data\* [*]</pattern>
</objectSet>
</include>
<exclude>
<objectSet>
<pattern type="File"> C:\* [*.mp3]</pattern>
</objectSet>
</exclude>
<include> and <exclude> rules precedence examples
These examples explain how USMT deals with <include> and <exclude> rules. When the rules are in different components, the resulting behavior is the same regardless of whether the components are in the same or in different migration .xml files.
Including and excluding files
| If the following code exists in the same component | Resulting behavior | Explanation |
|---|---|---|
|
Migrates all files and subfolders in Dir1 (including all .txt files in C:). | The <exclude> rule doesn't affect the migration because the <include> rule is more specific. |
|
Migrates all files and subfolders in C:\Dir1, except the .txt files in C:\Dir1\Dir2 and its subfolders. | Both rules are processed as intended. |
|
Migrates all files and subfolders in C:\Dir1, except the .txt files in C:\Dir1 and its subfolders. | Both rules are processed as intended. |
|
Nothing is migrated. | The rules are equally specific, so the <exclude> rule takes precedence over the <include> rule. |
|
Migrates the .txt files in Dir1 and the .txt files from subfolders other than Dir2. No files are migrated from Dir2 or its subfolders. |
Both rules are processed as intended. |
|
Migrates all files and subfolders of Dir2, except the .txt files from Dir1 and any subfolders of Dir1 (including Dir2). | Both rules are processed as intended. |
| If the following code exists in different components | Resulting behavior | Explanation |
|---|---|---|
Component 1:
Component 2:
|
Migrates all files and subfolders of C:\Dir1\ (including C:\Dir1\Dir2). | Rules that are in different components don't affect each other, except for the <unconditionalExclude> rule. Therefore, in this example, although some .txt files were excluded when Component 1 was processed, they were included when Component 2 was processed. |
Component 1:
Component 2:
|
Migrates all files and subfolders from Dir2 except the .txt files in C:\Dir1 and its subfolders. | Both rules are processed as intended. |
Component 1:
Component 2:
|
Migrates all .txt files in Dir1 and any subfolders. | Component 1 doesn't contain an <include> rule, so the <exclude> rule isn't processed. |
Including and excluding registry objects
| If the following code exists in the same component | Resulting behavior | Explanation |
|---|---|---|
|
Migrates all keys in HKLM\Software\Microsoft\Command Processor except DefaultColor. | Both rules are processed as intended. |
|
Migrates only DefaultColor in HKLM\Software\Microsoft\Command Processor. | DefaultColor is migrated because the <include> rule is more specific than the <exclude> rule. |
|
Doesn't migrate DefaultColor. | The rules are equally specific, so the <exclude> rule takes precedence over the <include> rule. |
| If the following code exists in different components | Resulting behavior | Explanation |
|---|---|---|
Component 1:
Component 2:
|
Migrates all the keys/values under HKLM\Software\Microsoft\Command Processor. | Rules that are in different components don't affect each other, except for the <unconditionalExclude> rule. In this example, the objects that were excluded when Component 1 was processed were included when Component 2 was processed. |
File collisions
What is the default behavior when there are file collisions?
If there isn't a <merge> rule, the default behavior for the registry is for the source to overwrite the destination. The default behavior for files is for the source to be renamed incrementally: for example, OriginalFileName(1).OriginalExtension, OriginalFileName(2).OriginalExtension, and so on.
How does the <merge> rule work when there are file collisions?
When a collision is detected, USMT selects the most specific <merge> rule and apply it to resolve the conflict. For example, if a <merge> rule exists for C:\* [*] set to sourcePriority() and another <merge> rule for C:\subfolder\* [*] set to destinationPriority() , then USMT uses the destinationPriority() rule because it's the most specific.
Example scenario
The source computer contains the following files:
C:\Data\SampleA.txtC:\Data\SampleB.txtC:\Data\Folder\SampleB.txt
The destination computer contains the following files:
C:\Data\SampleB.txtC:\Data\SampleB.txt
A custom .xml file contains the following code:
<include>
<objectSet>
<pattern type="File">c:\data\* [*]</pattern>
</objectSet>
</include>
For this example, the following information describes the resulting behavior if the code is added to the custom .xml file.
Example 1
<merge script="MigXmlHelper.DestinationPriority()">
<objectSet>
<pattern type="File">c:\data* []</pattern>
</objectSet>
</merge>
Result: During ScanState, all the files are added to the store. During LoadState, only C:\Data\SampleA.txt is restored.
Example 2
<merge script="MigXmlHelper.SourcePriority()">
<objectSet>
<pattern type="File">c:\data* []</pattern>
</objectSet>
</merge>
Result: During ScanState, all the files are added to the store. During LoadState, all the files are restored, overwriting the existing files on the destination computer.
Example 3
<merge script="MigXmlHelper.SourcePriority()">
<objectSet>
<pattern type="File">c:\data\ [*]</pattern>
</objectSet>
</merge>
Result: During ScanState, all the files are added to the store. During LoadState, the following actions occur:
C:\Data\SampleA.txtis restored.C:\Data\SampleB.txtis restored, overwriting the existing file on the destination computer.C:\Data\Folder\SampleB.txtaren't restored.