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410aa248e5
This fixes a set of issues that have accumulated over the past months (or years) in various code areas. Most fixes are related to some recent additions, as of the development of v15. Author: Justin Pryzby Discussion: https://postgr.es/m/20220124030001.GQ23027@telsasoft.com
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* pgcheckdir.c
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*
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* A simple subroutine to check whether a directory exists and is empty or not.
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* Useful in both initdb and the backend.
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/port/pgcheckdir.c
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#include <dirent.h>
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/*
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* Test to see if a directory exists and is empty or not.
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*
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* Returns:
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* 0 if nonexistent
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* 1 if exists and empty
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* 2 if exists and contains _only_ dot files
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* 3 if exists and contains a mount point
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* 4 if exists and not empty
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* -1 if trouble accessing directory (errno reflects the error)
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*/
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int
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pg_check_dir(const char *dir)
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{
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int result = 1;
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DIR *chkdir;
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struct dirent *file;
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bool dot_found = false;
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bool mount_found = false;
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int readdir_errno;
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chkdir = opendir(dir);
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if (chkdir == NULL)
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return (errno == ENOENT) ? 0 : -1;
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while (errno = 0, (file = readdir(chkdir)) != NULL)
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{
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if (strcmp(".", file->d_name) == 0 ||
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strcmp("..", file->d_name) == 0)
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{
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/* skip this and parent directory */
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continue;
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}
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#ifndef WIN32
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/* file starts with "." */
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else if (file->d_name[0] == '.')
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{
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dot_found = true;
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}
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/* lost+found directory */
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else if (strcmp("lost+found", file->d_name) == 0)
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{
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mount_found = true;
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}
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#endif
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else
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{
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result = 4; /* not empty */
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break;
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}
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}
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if (errno)
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result = -1; /* some kind of I/O error? */
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/* Close chkdir and avoid overwriting the readdir errno on success */
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readdir_errno = errno;
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if (closedir(chkdir))
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result = -1; /* error executing closedir */
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else
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errno = readdir_errno;
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/* We report on mount point if we find a lost+found directory */
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if (result == 1 && mount_found)
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result = 3;
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/* We report on dot-files if we _only_ find dot files */
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if (result == 1 && dot_found)
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result = 2;
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return result;
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}
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