(GH-560) Consider short and long SHAs #561
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As pointed out in #560, the check for SHA equality only
currently works for long shas which are 40 characters.
If a short SHA with :revision rev-parse HEAD returns a long SHA
therefore rendering the equality check false.
e.g
"cb1eb6" != "cb1eb6bb33eb6889818f5b02aa593b4ff2f8ca33"
This commit updates the args so that rev-parse will always return a SHA
that is the same length as the value provided with the :revision
parameter.
This will cause the check to be true and exit get_revision early as it would
do when both values are 40 characters.