Merge branch 'jn/fix-abbrev'

* jn/fix-abbrev:
  examples/commit: use --abbrev for commit summary
  checkout, commit: remove confusing assignments to rev.abbrev
  archive: abbreviate substituted commit ids again

builtin/commit.c

@@ -1163,7 +1163,6 @@ static void print_summary(const char *prefix, const unsigned char *sha1)
 	init_revisions(&rev, prefix);
 	setup_revisions(0, NULL, &rev, NULL);
 
-	rev.abbrev = 0;
 	rev.diff = 1;
 	rev.diffopt.output_format =
 		DIFF_FORMAT_SHORTSTAT | DIFF_FORMAT_SUMMARY;