[PATCH 2/2] checkout: do not write full sha1 to reflog

A snippet from a typical git session may look like this:

  $ git checkout @~3
  ...
  $ git checkout -

The reflog entries corresponding to the two checkouts look like:

  f855138: checkout: moving from bdff0e3a374617dce784f801b97500d9ba2e4705 to co-reflog
  bdff0e3: checkout: moving from co-reflog to HEAD~3

There is no need to write the full SHA-1 to the user-visible reflog; use
find_unique_abbrev() to shorten the first line like:

  f855138: checkout: moving from bdff0e3 to co-reflog

Signed-off-by: Ramkumar Ramachandra <redacted>
---
 builtin/checkout.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index f5b50e5..41b1929 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c

@@ -619,7 +619,7 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 
 	old_desc = old->name;
 	if (!old_desc && old->commit)
-		old_desc = sha1_to_hex(old->commit->object.sha1);
+		old_desc = find_unique_abbrev(old->commit->object.sha1, DEFAULT_ABBREV);
 	strbuf_addf(&msg, "checkout: moving from %s to %s",
 		    old_desc ? old_desc : "(invalid)", new->name);
 

-- 
1.8.3.1.438.g96d34e8