refdb: handle SHA256 references

src/libgit2/parse.c

@@ -102,13 +102,16 @@ int git_parse_advance_digit(int64_t *out, git_parse_ctx *ctx, int base)
 	return 0;
 }
 
-int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx)
+int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx, git_oid_t oid_type)
 {
-	if (ctx->line_len < GIT_OID_SHA1_HEXSIZE)
+	size_t oid_hexsize = git_oid_hexsize(oid_type);
+	GIT_ASSERT(oid_hexsize);
+
+	if (ctx->line_len < oid_hexsize)
 		return -1;
-	if ((git_oid__fromstrn(out, ctx->line, GIT_OID_SHA1_HEXSIZE, GIT_OID_SHA1)) < 0)
+	if ((git_oid__fromstrn(out, ctx->line, oid_hexsize, oid_type)) < 0)
 		return -1;
-	git_parse_advance_chars(ctx, GIT_OID_SHA1_HEXSIZE);
+	git_parse_advance_chars(ctx, oid_hexsize);
 	return 0;
 }
 

src/libgit2/parse.h

@@ -50,7 +50,7 @@ int git_parse_advance_expected(
 int git_parse_advance_ws(git_parse_ctx *ctx);
 int git_parse_advance_nl(git_parse_ctx *ctx);
 int git_parse_advance_digit(int64_t *out, git_parse_ctx *ctx, int base);
-int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx);
+int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx, git_oid_t oid_type);
 
 enum GIT_PARSE_PEEK_FLAGS {
 	GIT_PARSE_PEEK_SKIP_WHITESPACE = (1 << 0)

src/libgit2/refdb_fs.c

@@ -1949,9 +1949,9 @@ static int reflog_parse(git_reflog *log, const char *buf, size_t buf_size)
 		entry->committer = git__calloc(1, sizeof(*entry->committer));
 		GIT_ERROR_CHECK_ALLOC(entry->committer);
 
-		if (git_parse_advance_oid(&entry->oid_old, &parser) < 0 ||
+		if (git_parse_advance_oid(&entry->oid_old, &parser, log->oid_type) < 0 ||
 		    git_parse_advance_expected(&parser, " ", 1) < 0 ||
-		    git_parse_advance_oid(&entry->oid_cur, &parser) < 0)
+		    git_parse_advance_oid(&entry->oid_cur, &parser, log->oid_type) < 0)
 			goto next;
 
 		sig = parser.line;