[PATCH v11 03/41] refs.c: constify the sha arguments for ref_transaction_create|delete|update

[Ronnie Sahlberg <sahlberg@google.com>]

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.

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

diff --git a/refs.c b/refs.c
index 33541f4..a767ef6 100644
--- a/refs.c
+++ b/refs.c
@@ -3333,7 +3333,8 @@ 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);
@@ -3347,7 +3348,7 @@ 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);
@@ -3361,7 +3362,7 @@ 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 306d833..b893838 100644
--- a/refs.h
+++ b/refs.h
@@ -237,7 +237,8 @@ struct ref_transaction *ref_transaction_begin(void);
  */
 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);
 
 /*
@@ -248,7 +249,7 @@ 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);
 
 /*
@@ -258,7 +259,7 @@ 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);
 
 /*
-- 
2.0.0.rc3.474.g0203784