Merge branch 'sp/pack'

* sp/pack:
  Style nit - don't put space after function names
  Ensure the pack index is opened before access
  Simplify index access condition in count-objects, pack-redundant
  Test for recent rev-parse $abbrev_sha1 regression
  rev-parse: Identify short sha1 sums correctly.
  Attempt to delay prepare_alt_odb during get_sha1
  Micro-optimize prepare_alt_odb
  Lazily open pack index files on demand

t/t6101-rev-parse-parents.sh

@@ -29,5 +29,15 @@ test_expect_success 'final^1^3 not valid' "if git-rev-parse --verify final^1^3;
 test_expect_failure '--verify start2^1' 'git-rev-parse --verify start2^1'
 test_expect_success '--verify start2^0' 'git-rev-parse --verify start2^0'
 
+test_expect_success 'repack for next test' 'git repack -a -d'
+test_expect_success 'short SHA-1 works' '
+	start=`git rev-parse --verify start` &&
+	echo $start &&
+	abbrv=`echo $start | sed s/.\$//` &&
+	echo $abbrv &&
+	abbrv=`git rev-parse --verify $abbrv` &&
+	echo $abbrv &&
+	test $start = $abbrv'
+
 test_done