I am writing a pre-commit hook where I would like to enforce some rule based on the content of a file before the transaction. Therefore, when a transaction begins, I would like to svnlook cat the contents of any file marked "U", "UU", or "D" without the pending changes. Is it safe for me to take the provided transaction identifier (second argument to pre-commit) and strip off the dash and any characters that follow it and consider that the "base revision"? Is there a better way to get at this information?
Determining base revision of transaction in pre-commit
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The direct answer is no. The transaction number could be anything. However,
svnlook youngest <repos>
will return the last revision which should be what you're looking for.Be careful with pre-commit hooks:
There are times when it's best to use a continuous integration server to verify the commit rather than a pre-commit or post-commit hook. For example, allow a developer to commit a file, but if the developer isn't in the right group, maybe email the development lead.
There's a 90% chance that the developer is probably doing the right thing. That development lead probably already knows about the issue. And, if there is an issue, you can revert the change.