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Hash Value Comparisons in Conflict Detection
Finding and Viewing the Right Conflicts
ConflictManager Reference
View this information:
In the Conflict Details pane when you select a conflict in the Conflict List.
In the Resolve wizard, which you start by selecting Conflicts menu > Resolve.
On the Properties dialog box, which you open by double-clicking a package in the
Conflict Details pane.
The Import Wizard in Software Manager scans every source file in a package and, if it
can find the file, it generates a hash value for that file. If the file cannot be found
(example: if its source path is broken), a hash value is not generated.
A hash value is a number that is generated from every byte in the file, in such a way
that it is extremely unlikely that some other file will produce the same hash value.
ConflictManager can use the file hash value to find conflicts.
Example: Two packages install files with identical names at the same location.
If both files have a hash value, ConflictManager compares them. Matching hash
values mean that the files are the same and a conflict will not occur; non-matching
hash values mean that the files are not the same and there is a conflict. Further
conflict checks are not necessary.
If only one file has a hash value, or neither file has a hash value, then
ConflictManager compares other file information (version, size, date/time, and so
on).
See
About Conflicts
Generating the hash values can slow the package import. However, using hash value
comparisons results in faster conflict detection and analysis because, once it compares
the hash values, ConflictManager does not have to compare anything else. Hash value
comparison also results in 100% accurate file conflict detection because it eliminates
false positives (example: files that are the same at the byte level but have different
date/time stamps).
The hash value is displayed in the Conflict Details pane in ConflictManager, and on the
conflict resolution dialog boxes.
To use hash value comparison, mark the Use file hash values to determine conflicts
check box in Conflict Settings.
See
Defining Types of Conflicts to Detect
ConflictManager provides flexibility in the types of conflicts you can detect, and lets you
filter out items that might otherwise be identified as conflicts. This lets you see only the
types of conflicts that are important in your environment.
Define conflict settings.
Conflict settings determine the type of conflicts that are detected and the files and
registry keys that are excluded from conflict detection.
See
About Conflict Settings
on page 13.
on page 19.
on page 19.
Introduction to ConflictManager
14
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