forked from EnterpriseDB/repmgr
-
Notifications
You must be signed in to change notification settings - Fork 0
/
dirmod.c
194 lines (168 loc) · 4.14 KB
/
dirmod.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/*
*
* dirmod.c
* directory handling functions
*
* Copyright (c) 2ndQuadrant, 2010-2017
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "postgres_fe.h"
/* Don't modify declarations in system headers */
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
/*
* pgfnames
*
* return a list of the names of objects in the argument directory. Caller
* must call pgfnames_cleanup later to free the memory allocated by this
* function.
*/
char **
pgfnames(const char *path)
{
DIR *dir;
struct dirent *file;
char **filenames;
int numnames = 0;
int fnsize = 200; /* enough for many small dbs */
dir = opendir(path);
if (dir == NULL)
{
return NULL;
}
filenames = (char **) palloc(fnsize * sizeof(char *));
while (errno = 0, (file = readdir(dir)) != NULL)
{
if (strcmp(file->d_name, ".") != 0 && strcmp(file->d_name, "..") != 0)
{
if (numnames + 1 >= fnsize)
{
fnsize *= 2;
filenames = (char **) repalloc(filenames,
fnsize * sizeof(char *));
}
filenames[numnames++] = pstrdup(file->d_name);
}
}
if (errno)
{
fprintf(stderr, _("could not read directory \"%s\": %s\n"),
path, strerror(errno));
}
filenames[numnames] = NULL;
if (closedir(dir))
{
fprintf(stderr, _("could not close directory \"%s\": %s\n"),
path, strerror(errno));
}
return filenames;
}
/*
* pgfnames_cleanup
*
* deallocate memory used for filenames
*/
void
pgfnames_cleanup(char **filenames)
{
char **fn;
for (fn = filenames; *fn; fn++)
pfree(*fn);
pfree(filenames);
}
/*
* rmtree
*
* Delete a directory tree recursively.
* Assumes path points to a valid directory.
* Deletes everything under path.
* If rmtopdir is true deletes the directory too.
* Returns true if successful, false if there was any problem.
* (The details of the problem are reported already, so caller
* doesn't really have to say anything more, but most do.)
*/
bool
rmtree(const char *path, bool rmtopdir)
{
bool result = true;
char pathbuf[MAXPGPATH];
char **filenames;
char **filename;
struct stat statbuf;
/*
* we copy all the names out of the directory before we start modifying
* it.
*/
filenames = pgfnames(path);
if (filenames == NULL)
return false;
/* now we have the names we can start removing things */
for (filename = filenames; *filename; filename++)
{
snprintf(pathbuf, MAXPGPATH, "%s/%s", path, *filename);
/*
* It's ok if the file is not there anymore; we were just about to
* delete it anyway.
*
* This is not an academic possibility. One scenario where this
* happens is when bgwriter has a pending unlink request for a file in
* a database that's being dropped. In dropdb(), we call
* ForgetDatabaseFsyncRequests() to flush out any such pending unlink
* requests, but because that's asynchronous, it's not guaranteed that
* the bgwriter receives the message in time.
*/
if (lstat(pathbuf, &statbuf) != 0)
{
if (errno != ENOENT)
{
result = false;
}
continue;
}
if (S_ISDIR(statbuf.st_mode))
{
/* call ourselves recursively for a directory */
if (!rmtree(pathbuf, true))
{
/* we already reported the error */
result = false;
}
}
else
{
if (unlink(pathbuf) != 0)
{
if (errno != ENOENT)
{
result = false;
}
}
}
}
if (rmtopdir)
{
if (rmdir(path) != 0)
{
result = false;
}
}
pgfnames_cleanup(filenames);
return result;
}