how to determine version of binary

[Neal Kreitzinger <nkreitzinger@xxxxxxxxx>]

Scenario:  I detect a binary file that is 'dirty'.  I don't know how it 
got there.  However, I know it came from a git repo.  So I calculate the 
sha1 of the binary.  What is the git command to determine which commit 
that binary version first appeared in?  And the last commit that binary 
appeared in?

Why:  we have people ftp'ing binaries around.  I want to see the commit 
message and source change of that commit to see what the binary version is.

v/r,
neal

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