Document git-patch-id a bit better.
Pavel Roskin wondered what the SHA1 output at the beginning of git-diff-tree was about. The only consumer of that information so far is this git-patch-id command, which was inadequately documented. Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -18,6 +18,12 @@ ID" are almost guaranteed to be the same thing.
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IOW, you can use this thing to look for likely duplicate commits.
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When dealing with git-diff-tree output, it takes advantage of
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the fact that the patch is prefixed with the object name of the
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commit, and outputs two 40-byte hexadecimal string. The first
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string is the patch ID, and the second string is the commit ID.
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This can be used to make a mapping from patch ID to commit ID.
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OPTIONS
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-------
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<patch>::
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