fix parsing of tags. make parse errors useful. add new tag tests. old code read every head of .hgtags. delete and recreate of .hgtags gave new head, but if error in deleted rev, .hgtags had error messages every time it was parsed. this was very hard to fix, because deleted revs hard to get back and update, needed merges too. new code reads .hgtags on every head. advantage is if parse error happens with new code, is possible to fix them by editing .hgtags on a head and committing. NOTE: new code uses binary search of manifest of each head to be fast, but still much slower than old code. best thing would be to have delete record stored in filelog so we never touch manifest. could find live heads directly from filelog. this is more work than i want now. new tests check for parse of tags on different heads, and inaccessible heads created by delete and recreate of .hgtags.

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#!/bin/sh

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#

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# Corrupt an hg repo with a pull started during an aborted commit

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#

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# Create two repos, so that one of them can pull from the other one.

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hg init source

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cd source

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touch foo

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hg add foo

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hg ci -m 'add foo'

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hg clone . ../corrupted

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echo >> foo

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hg ci -m 'change foo'

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# Add a hook to wait 5 seconds and then abort the commit

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cd ../corrupted

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echo '[hooks]' >> .hg/hgrc

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echo 'pretxncommit = sleep 5; exit 1' >> .hg/hgrc

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# start a commit...

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touch bar

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hg add bar

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hg ci -m 'add bar' &

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# ... and start a pull while the commit is still running

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sleep 1

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hg pull ../source 2>/dev/null

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# see what happened

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wait

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hg verify