filter-branch documentation: non-zero exit status in command abort the filter
Since commit 8c1ce0f46b filter-branch fails
when a <command> has a non-zero exit status. This commit makes it clear
in the documentation and also fixes the parent-filter example, that was
incorrectly returning non-zero when the commit being tested wasn't the
one to be rewritten.
Signed-off-by: Caio Marcelo de Oliveira Filho <cmarcelo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
			
			
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			@ -56,7 +56,9 @@ notable exception of the commit filter, for technical reasons).
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Prior to that, the $GIT_COMMIT environment variable will be set to contain
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the id of the commit being rewritten.  Also, GIT_AUTHOR_NAME,
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GIT_AUTHOR_EMAIL, GIT_AUTHOR_DATE, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL,
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and GIT_COMMITTER_DATE are set according to the current commit.
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and GIT_COMMITTER_DATE are set according to the current commit. If any
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evaluation of <command> returns a non-zero exit status, the whole operation
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will be aborted.
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A 'map' function is available that takes an "original sha1 id" argument
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and outputs a "rewritten sha1 id" if the commit has been already
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@ -197,7 +199,7 @@ happened).  If this is not the case, use:
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--------------------------------------------------------------------------
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git filter-branch --parent-filter \
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	'cat; test $GIT_COMMIT = <commit-id> && echo "-p <graft-id>"' HEAD
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	'test $GIT_COMMIT = <commit-id> && echo "-p <graft-id>" || cat' HEAD
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--------------------------------------------------------------------------
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or even simpler:
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