CREATE EXTENSION adminpack;
-- create new file
SELECT pg_file_write('test_file1', 'test1', false);
 pg_file_write 
---------------
             5
(1 row)

SELECT pg_read_file('test_file1');
 pg_read_file 
--------------
 test1
(1 row)

-- append
SELECT pg_file_write('test_file1', 'test1', true);
 pg_file_write 
---------------
             5
(1 row)

SELECT pg_read_file('test_file1');
 pg_read_file 
--------------
 test1test1
(1 row)

-- error, already exists
SELECT pg_file_write('test_file1', 'test1', false);
ERROR:  file "test_file1" exists
SELECT pg_read_file('test_file1');
 pg_read_file 
--------------
 test1test1
(1 row)

-- disallowed file paths for non-superusers and users who are
-- not members of pg_write_server_files
CREATE ROLE regress_user1;
GRANT pg_read_all_settings TO regress_user1;
GRANT EXECUTE ON FUNCTION pg_file_write(text,text,bool) TO regress_user1;
SET ROLE regress_user1;
SELECT pg_file_write('../test_file0', 'test0', false);
ERROR:  path must be in or below the current directory
SELECT pg_file_write('/tmp/test_file0', 'test0', false);
ERROR:  absolute path not allowed
SELECT pg_file_write(current_setting('data_directory') || '/test_file4', 'test4', false);
 pg_file_write 
---------------
             5
(1 row)

SELECT pg_file_write(current_setting('data_directory') || '/../test_file4', 'test4', false);
ERROR:  reference to parent directory ("..") not allowed
RESET ROLE;
REVOKE EXECUTE ON FUNCTION pg_file_write(text,text,bool) FROM regress_user1;
REVOKE pg_read_all_settings FROM regress_user1;
DROP ROLE regress_user1;
-- sync
SELECT pg_file_sync('test_file1'); -- sync file
 pg_file_sync 
--------------
 
(1 row)

SELECT pg_file_sync('pg_stat'); -- sync directory
 pg_file_sync 
--------------
 
(1 row)

SELECT pg_file_sync('test_file2'); -- not there
ERROR:  could not stat file "test_file2": No such file or directory
-- rename file
SELECT pg_file_rename('test_file1', 'test_file2');
 pg_file_rename 
----------------
 t
(1 row)

SELECT pg_read_file('test_file1');  -- not there
ERROR:  could not open file "test_file1" for reading: No such file or directory
SELECT pg_read_file('test_file2');
 pg_read_file 
--------------
 test1test1
(1 row)

-- error
SELECT pg_file_rename('test_file1', 'test_file2');
WARNING:  file "test_file1" is not accessible: No such file or directory
 pg_file_rename 
----------------
 f
(1 row)

-- rename file and archive
SELECT pg_file_write('test_file3', 'test3', false);
 pg_file_write 
---------------
             5
(1 row)

SELECT pg_file_rename('test_file2', 'test_file3', 'test_file3_archive');
 pg_file_rename 
----------------
 t
(1 row)

SELECT pg_read_file('test_file2');  -- not there
ERROR:  could not open file "test_file2" for reading: No such file or directory
SELECT pg_read_file('test_file3');
 pg_read_file 
--------------
 test1test1
(1 row)

SELECT pg_read_file('test_file3_archive');
 pg_read_file 
--------------
 test3
(1 row)

-- unlink
SELECT pg_file_unlink('test_file1');  -- does not exist
 pg_file_unlink 
----------------
 f
(1 row)

SELECT pg_file_unlink('test_file2');  -- does not exist
 pg_file_unlink 
----------------
 f
(1 row)

SELECT pg_file_unlink('test_file3');
 pg_file_unlink 
----------------
 t
(1 row)

SELECT pg_file_unlink('test_file3_archive');
 pg_file_unlink 
----------------
 t
(1 row)

SELECT pg_file_unlink('test_file4');
 pg_file_unlink 
----------------
 t
(1 row)

-- superuser checks
CREATE USER regress_user1;
SET ROLE regress_user1;
SELECT pg_file_write('test_file0', 'test0', false);
ERROR:  permission denied for function pg_file_write
SELECT pg_file_sync('test_file0');
ERROR:  permission denied for function pg_file_sync
SELECT pg_file_rename('test_file0', 'test_file0');
ERROR:  permission denied for function pg_file_rename
CONTEXT:  SQL function "pg_file_rename" statement 1
SELECT pg_file_unlink('test_file0');
ERROR:  permission denied for function pg_file_unlink
SELECT pg_logdir_ls();
ERROR:  permission denied for function pg_logdir_ls
RESET ROLE;
DROP USER regress_user1;
-- no further tests for pg_logdir_ls() because it depends on the
-- server's logging setup