write_locked_index(): add flag to avoid writing unchanged index

diff --git a/builtin/mktree.c b/builtin/mktree.c
index de9b40fc63b0a4f76401a111aba806c64ce36ee9..8dd9f52f77329edb0e270552cab0f0c1298e7e32 100644 (file)
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -40,7 +40,7 @@ static int ent_compare(const void *a_, const void *b_)
                                 b->name, b->len, b->mode);
 }
 
-static void write_tree(unsigned char *sha1)
+static void write_tree(struct object_id *oid)
 {
        struct strbuf buf;
        size_t size;
@@ -57,7 +57,7 @@ static void write_tree(unsigned char *sha1)
                strbuf_add(&buf, ent->sha1, 20);
        }
 
-       write_sha1_file(buf.buf, buf.len, tree_type, sha1);
+       write_object_file(buf.buf, buf.len, tree_type, oid);
        strbuf_release(&buf);
 }
 
@@ -72,7 +72,7 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
        unsigned mode;
        enum object_type mode_type; /* object type derived from mode */
        enum object_type obj_type; /* object type derived from sha */
-       char *path;
+       char *path, *to_free = NULL;
        unsigned char sha1[20];
 
        ptr = buf;
@@ -102,7 +102,7 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
                struct strbuf p_uq = STRBUF_INIT;
                if (unquote_c_style(&p_uq, path, NULL))
                        die("invalid quoting");
-               path = strbuf_detach(&p_uq, NULL);
+               path = to_free = strbuf_detach(&p_uq, NULL);
        }
 
        /*
@@ -136,12 +136,13 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
        }
 
        append_to_tree(mode, sha1, path);
+       free(to_free);
 }
 
 int cmd_mktree(int ac, const char **av, const char *prefix)
 {
        struct strbuf sb = STRBUF_INIT;
-       unsigned char sha1[20];
+       struct object_id oid;
        int nul_term_line = 0;
        int allow_missing = 0;
        int is_batch_mode = 0;
@@ -180,8 +181,8 @@ int cmd_mktree(int ac, const char **av, const char *prefix)
                         */
                        ; /* skip creating an empty tree */
                } else {
-                       write_tree(sha1);
-                       puts(sha1_to_hex(sha1));
+                       write_tree(&oid);
+                       puts(oid_to_hex(&oid));
                        fflush(stdout);
                }
                used=0; /* reset tree entry buffer for re-use in batch mode */