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fadd069d03
When unpack_trees() three-way merge logic is called from merge-recursive and finds that local changes are going to be clobbered, its plumbing level messages were given as errors first, and then the merge driver added even more scary message "fatal: merging of trees <a long object name> and <another long object name> failed". This is most often encountered by new CVS/SVN migrants who are used to start a merge from a dirty work tree. The saddest part is that the merge refused to run to prevent _any_ damage from being done to your work tree when these messages are given, but the messages look a lot more scarier than the conflicted case where the user needs to resolve them. Replace the plumbing level messages so that they talk about what it is protecting the user from, and end the messages with "Aborting." so that it becomes clear that the command did not do any harm. The final "merging of trees failed" message is superfluous, unless you are interested in debugging the merge-recursive itself. Squelch the current die() message by default, but allow it to help people who debug git with verbosity level 4 or greater. Unless there is some bug, an inner merge that does not touch working tree should not trigger any such error, so emit the current die() message when we see an error return from it while running the inner merge, too. It would also help people who debug git. We could later add instructions on how to recover (i.e. "stash changes away or commit on a side branch and retry") instead of the silent exit(128) I have in this patch, and then use Peff's advice.* mechanism to squelch it (e.g. "advice.mergeindirtytree"), but they are separate topics. Tested-by: Nanako Shiraishi <nanako3@lavabit.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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GIT - the stupid content tracker
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