1 /*-------------------------------------------------------------------------
5 * A simple subroutine to check whether a directory exists and is empty or not.
6 * Useful in both initdb and the backend.
8 * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
9 * Portions Copyright (c) 1994, Regents of the University of California
12 * src/port/pgcheckdir.c
13 *-------------------------------------------------------------------------
22 * Test to see if a directory exists and is empty or not.
26 * 1 if exists and empty
27 * 2 if exists and contains _only_ dot files
28 * 3 if exists and contains a mount point
29 * 4 if exists and not empty
30 * -1 if trouble accessing directory (errno reflects the error)
33 pg_check_dir(const char *dir
)
38 bool dot_found
= false;
39 bool mount_found
= false;
42 chkdir
= opendir(dir
);
44 return (errno
== ENOENT
) ? 0 : -1;
46 while (errno
= 0, (file
= readdir(chkdir
)) != NULL
)
48 if (strcmp(".", file
->d_name
) == 0 ||
49 strcmp("..", file
->d_name
) == 0)
51 /* skip this and parent directory */
55 /* file starts with "." */
56 else if (file
->d_name
[0] == '.')
60 /* lost+found directory */
61 else if (strcmp("lost+found", file
->d_name
) == 0)
68 result
= 4; /* not empty */
74 result
= -1; /* some kind of I/O error? */
76 /* Close chkdir and avoid overwriting the readdir errno on success */
77 readdir_errno
= errno
;
79 result
= -1; /* error executing closedir */
81 errno
= readdir_errno
;
83 /* We report on mount point if we find a lost+found directory */
84 if (result
== 1 && mount_found
)
87 /* We report on dot-files if we _only_ find dot files */
88 if (result
== 1 && dot_found
)