ref_transaction_create|delete|update has no need to modify the sha1
arguments passed to it so it should use const unsigned char* instead
of unsigned char*.

Some functions, such as fast_forward_to(), already have its old/new
sha1 arguments as consts. This function will at some point need to
use ref_transaction_update() in which case this change is required.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 refs.c | 7 ++++---
 refs.h | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/refs.c b/refs.c
index 728a761..138ab70 100644
--- a/refs.c
+++ b/refs.c
@@ -3329,7 +3329,8 @@ static struct ref_update *add_update(struct 
ref_transaction *transaction,
 
 void ref_transaction_update(struct ref_transaction *transaction,
                            const char *refname,
-                           unsigned char *new_sha1, unsigned char *old_sha1,
+                           const unsigned char *new_sha1,
+                           const unsigned char *old_sha1,
                            int flags, int have_old)
 {
        struct ref_update *update = add_update(transaction, refname);
@@ -3343,7 +3344,7 @@ void ref_transaction_update(struct ref_transaction 
*transaction,
 
 void ref_transaction_create(struct ref_transaction *transaction,
                            const char *refname,
-                           unsigned char *new_sha1,
+                           const unsigned char *new_sha1,
                            int flags)
 {
        struct ref_update *update = add_update(transaction, refname);
@@ -3357,7 +3358,7 @@ void ref_transaction_create(struct ref_transaction 
*transaction,
 
 void ref_transaction_delete(struct ref_transaction *transaction,
                            const char *refname,
-                           unsigned char *old_sha1,
+                           const unsigned char *old_sha1,
                            int flags, int have_old)
 {
        struct ref_update *update = add_update(transaction, refname);
diff --git a/refs.h b/refs.h
index 0f08def..892c5b6 100644
--- a/refs.h
+++ b/refs.h
@@ -239,7 +239,8 @@ void ref_transaction_rollback(struct ref_transaction 
*transaction);
  */
 void ref_transaction_update(struct ref_transaction *transaction,
                            const char *refname,
-                           unsigned char *new_sha1, unsigned char *old_sha1,
+                           const unsigned char *new_sha1,
+                           const unsigned char *old_sha1,
                            int flags, int have_old);
 
 /*
@@ -250,7 +251,7 @@ void ref_transaction_update(struct ref_transaction 
*transaction,
  */
 void ref_transaction_create(struct ref_transaction *transaction,
                            const char *refname,
-                           unsigned char *new_sha1,
+                           const unsigned char *new_sha1,
                            int flags);
 
 /*
@@ -260,7 +261,7 @@ void ref_transaction_create(struct ref_transaction 
*transaction,
  */
 void ref_transaction_delete(struct ref_transaction *transaction,
                            const char *refname,
-                           unsigned char *old_sha1,
+                           const unsigned char *old_sha1,
                            int flags, int have_old);
 
 /*
-- 
1.9.1.513.gd486896

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