lib: reject relative paths in n_d_{create,open}_verbose

There are many places in the notmuch code where the path is assumed to be absolute. If someone (TM) wants a project, one could remove these assumptions. In the mean time, prevent users from shooting themselves in the foot.

Update test suite mark tests for this error as no longer broken, and
also convert some tests that used relative paths for nonexistent
directories.

NEWS

@@ -1,3 +1,12 @@
+Notmuch 0.21 (UNRELEASED)
+=========================
+
+Library
+-------
+
+The use of absolute paths is now enforced when calling notmuch_database_{open, create}
+
+
 Notmuch 0.20.1 (2015-06-01)
 ===========================
 

lib/database.cc

@@ -659,6 +659,12 @@ notmuch_database_create_verbose (const char *path,
 	goto DONE;
     }
 
+    if (path[0] != '/') {
+	message = strdup ("Error: Database path must be absolute.\n");
+	status = NOTMUCH_STATUS_PATH_ERROR;
+	goto DONE;
+    }
+
     err = stat (path, &st);
     if (err) {
 	IGNORE_RESULT (asprintf (&message, "Error: Cannot create database at %s: %s.\n",
@@ -849,6 +855,12 @@ notmuch_database_open_verbose (const char *path,
 	goto DONE;
     }
 
+    if (path[0] != '/') {
+	message = strdup ("Error: Database path must be absolute.\n");
+	status = NOTMUCH_STATUS_PATH_ERROR;
+	goto DONE;
+    }
+
     if (! (notmuch_path = talloc_asprintf (local, "%s/%s", path, ".notmuch"))) {
 	message = strdup ("Out of memory\n");
 	status = NOTMUCH_STATUS_OUT_OF_MEMORY;

test/T360-symbol-hiding.sh

@@ -11,16 +11,17 @@ test_description='exception symbol hiding'
 
 . ./test-lib.sh
 
-run_test(){
-    result=$(LD_LIBRARY_PATH="$TEST_DIRECTORY/../lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" $TEST_DIRECTORY/symbol-test 2>&1)
-}
+test_begin_subtest 'running test' run_test
+mkdir -p ${PWD}/fakedb/.notmuch
+( LD_LIBRARY_PATH="$TEST_DIRECTORY/../lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" \
+		 $TEST_DIRECTORY/symbol-test ${PWD}/fakedb ${PWD}/nonexistent \
+		 2>&1 | sed "s,${PWD},CWD,g") > OUTPUT
 
-output="A Xapian exception occurred opening database: Couldn't stat 'fakedb/.notmuch/xapian'
-caught No chert database found at path \`./nonexistent'"
-
-mkdir -p fakedb/.notmuch
-
-test_expect_success 'running test' run_test
+cat <<EOF > EXPECTED
+A Xapian exception occurred opening database: Couldn't stat 'CWD/fakedb/.notmuch/xapian'
+caught No chert database found at path \`CWD/nonexistent'
+EOF
+test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest 'checking output'
 test_expect_equal "$result" "$output"

test/T560-lib-error.sh

@@ -36,7 +36,6 @@ EOF
 test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest "Open relative path"
-test_subtest_known_broken
 test_C <<'EOF'
 #include <stdio.h>
 #include <notmuch.h>
@@ -55,7 +54,6 @@ EOF
 test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest "Create database in relative path"
-test_subtest_known_broken
 test_C <<'EOF'
 #include <stdio.h>
 #include <notmuch.h>
@@ -108,21 +106,21 @@ Error: Cannot create a database for a NULL path.
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
-test_begin_subtest "Create database in non-existant directory"
-test_C <<'EOF'
+test_begin_subtest "Create database in nonexistent directory"
+test_C ${PWD}/nonexistent/foo<<'EOF'
 #include <stdio.h>
 #include <notmuch.h>
 int main (int argc, char** argv)
 {
     notmuch_database_t *db;
     notmuch_status_t stat;
-    stat = notmuch_database_create ("./nonexistent/foo", &db);
+    stat = notmuch_database_create (argv[1], &db);
 }
 EOF
 cat <<'EOF' >EXPECTED
 == stdout ==
 == stderr ==
-Error: Cannot create database at ./nonexistent/foo: No such file or directory.
+Error: Cannot create database at CWD/nonexistent/foo: No such file or directory.
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 

test/symbol-test.cc

@@ -4,18 +4,18 @@
 #include <notmuch.h>
 
 
-int main() {
+int main(int argc, char** argv) {
   notmuch_database_t *notmuch;
   char *message = NULL;
 
-  if (notmuch_database_open_verbose  ("fakedb", NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch, &message))
+  if (notmuch_database_open_verbose  (argv[1], NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch, &message))
       if (message) {
 	  fputs (message, stderr);
 	  free (message);
       }
 
   try {
-    (void) new Xapian::WritableDatabase("./nonexistent", Xapian::DB_OPEN);
+    (void) new Xapian::WritableDatabase(argv[2], Xapian::DB_OPEN);
   } catch (const Xapian::Error &error) {
     printf("caught %s\n", error.get_msg().c_str());
     return 0;