status: get blob object id of file on disk

Add git_status_hashfile() to get blob's object id for a file without adding
it to the object database or needing a repository at all.
This functionality is similar to `git hash-object` without '-w'.

1 files changed, 60 insertions, 0 deletions

diff --git a/tests/t18-status.c b/tests/t18-status.c
new file mode 100644
index 000000000..6281a6743
--- /dev/null
+++ b/tests/t18-status.c
@@ -0,0 +1,60 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+#include "test_lib.h"
+#include "test_helpers.h"
+#include "fileops.h"
+#include "git2/status.h"
+
+#define STATUS_FOLDER TEST_RESOURCES "/status/"
+#define TEMP_STATUS_FOLDER TEMP_FOLDER "status"
+
+static const char *test_blob_oid = "9daeafb9864cf43055ae93beb0afd6c7d144bfa4";
+
+BEGIN_TEST(file0, "test retrieving OID from a file apart from the ODB")
+	char current_workdir[GIT_PATH_MAX];
+	char path_statusfiles[GIT_PATH_MAX];
+	char temp_path[GIT_PATH_MAX];
+	git_oid expected_id, actual_id;
+
+	must_pass(p_getcwd(current_workdir, sizeof(current_workdir)));
+	strcpy(path_statusfiles, current_workdir);
+	git_path_join(path_statusfiles, path_statusfiles, TEMP_STATUS_FOLDER);
+
+	must_pass(copydir_recurs(STATUS_FOLDER, path_statusfiles));
+	git_path_join(temp_path, path_statusfiles, "test.txt");
+
+	must_pass(git_futils_exists(temp_path));
+
+	git_oid_fromstr(&expected_id, test_blob_oid);
+	must_pass(git_status_hashfile(&actual_id, temp_path));
+
+	must_be_true(git_oid_cmp(&expected_id, &actual_id) == 0);
+
+	git_futils_rmdir_r(TEMP_STATUS_FOLDER, 1);
+END_TEST
+
+BEGIN_SUITE(status)
+	ADD_TEST(file0);
+END_SUITE