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Version Control with Subversion
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Version Control with Subversion - Using External Differencing Tools - External diff3

External diff3

Subversion calls external merge programs with parameters suitable for the GNU diff3 utility, expecting that the external program return with a successful error code and that the full file contents which result from the completed merge operation are printed on the standard output stream (so that Subversion can redirect them into the appropriate version controlled file). For most alternative merge programs, only the ninth, tenth, and eleventh arguments, the paths of the files which represent the “mine”, “older”, and “yours” inputs, respectively, are of interest. Note that because Subversion depends on the output of your merge program, you wrapper script must not exit before that output has been delivered to Subversion. When it finally does exit, it should return an errorcode of 0 if the merge was successful, or 1 if unresolved conflicts remain in the output—any other errorcode is considered a fatal error.

Example 7.4, “diff3wrap.sh” and Example 7.5, “diff3wrap.bat” are templates for external merge tool wrappers in the Bourne shell and Windows batch scripting languages, respectively.

Example 7.4. diff3wrap.sh

#!/bin/sh

# Configure your favorite diff3/merge program here.
DIFF3="/usr/local/bin/my-merge-tool"

# Subversion provides the paths we need as the ninth, tenth, and eleventh 
# parameters.
MINE=${9}
OLDER=${10}
YOURS=${11}

# Call the merge command (change the following line to make sense for
# your merge program).
$DIFF3 --older $OLDER --mine $MINE --yours $YOURS

# After performing the merge, this script needs to print the contents
# of the merged file to stdout.  Do that in whatever way you see fit.
# Return an errorcode of 0 on successful merge, 1 if unresolved conflicts
# remain in the result.  Any other errorcode will be treated as fatal.

Example 7.5. diff3wrap.bat

@ECHO OFF

REM Configure your favorite diff3/merge program here.
SET DIFF3="C:\Program Files\Funky Stuff\My Merge Tool.exe"

REM Subversion provides the paths we need as the ninth, tenth, and eleventh 
REM parameters.  But we only have access to nine parameters at a time, so we
REM shift our nine-parameter window twice to let us get to what we need.
SHIFT
SHIFT
SET MINE=%7
SET OLDER=%8
SET YOURS=%9

REM Call the merge command (change the following line to make sense for
REM your merge program).
%DIFF3% --older %OLDER% --mine %MINE% --yours %YOURS%

REM After performing the merge, this script needs to print the contents
REM of the merged file to stdout.  Do that in whatever way you see fit.
REM Return an errorcode of 0 on successful merge, 1 if unresolved conflicts
REM remain in the result.  Any other errorcode will be treated as fatal.


[40] Subversion developers are good, but even the best make mistakes.

[41] The GNU diff manual page puts it this way: “An exit status of 0 means no differences were found, 1 means some differences were found, and 2 means trouble.


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Version Control with Subversion
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