[PATCH 13/23] ref_update_reject_duplicates(): expose function to whole refs module

[Michael Haggerty]

It will soon have some other users.

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
 refs.c               | 17 +++++++++++++++++
 refs/files-backend.c | 17 -----------------
 refs/refs-internal.h |  8 ++++++++
 3 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/refs.c b/refs.c
index 689362db1e..43d65bc9c6 100644
--- a/refs.c
+++ b/refs.c
@@ -1689,6 +1689,23 @@ int create_symref(const char *ref_target, const char 
*refs_heads_master,
                                  refs_heads_master, logmsg);
 }
 
+int ref_update_reject_duplicates(struct string_list *refnames,
+                                struct strbuf *err)
+{
+       int i, n = refnames->nr;
+
+       assert(err);
+
+       for (i = 1; i < n; i++)
+               if (!strcmp(refnames->items[i - 1].string, 
refnames->items[i].string)) {
+                       strbuf_addf(err,
+                                   "multiple updates for ref '%s' not 
allowed.",
+                                   refnames->items[i].string);
+                       return 1;
+               }
+       return 0;
+}
+
 int ref_transaction_prepare(struct ref_transaction *transaction,
                            struct strbuf *err)
 {
diff --git a/refs/files-backend.c b/refs/files-backend.c
index f48409132d..d7596b5222 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2524,23 +2524,6 @@ static struct ref_iterator 
*files_reflog_iterator_begin(struct ref_store *ref_st
        return ref_iterator;
 }
 
-static int ref_update_reject_duplicates(struct string_list *refnames,
-                                       struct strbuf *err)
-{
-       int i, n = refnames->nr;
-
-       assert(err);
-
-       for (i = 1; i < n; i++)
-               if (!strcmp(refnames->items[i - 1].string, 
refnames->items[i].string)) {
-                       strbuf_addf(err,
-                                   "multiple updates for ref '%s' not 
allowed.",
-                                   refnames->items[i].string);
-                       return 1;
-               }
-       return 0;
-}
-
 /*
  * If update is a direct update of head_ref (the reference pointed to
  * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 2ff65d3ebd..52350c5301 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -169,6 +169,14 @@ int refs_read_raw_ref(struct ref_store *ref_store,
                      const char *refname, unsigned char *sha1,
                      struct strbuf *referent, unsigned int *type);
 
+/*
+ * Write an error to `err` and return a nonzero value iff the same
+ * refname appears multiple times in `refnames`. `refnames` must be
+ * sorted on entry to this function.
+ */
+int ref_update_reject_duplicates(struct string_list *refnames,
+                                struct strbuf *err);
+
 /*
  * Add a ref_update with the specified properties to transaction, and
  * return a pointer to the new object. This function does not verify
-- 
2.11.0