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Commit17f1523

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committed
Warn about initdb using mount-points
Add code to detect and warn about trying to initdb or create pg_xlog onmount points.
1 parent1bd42cd commit17f1523

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3 files changed

+60
-13
lines changed

3 files changed

+60
-13
lines changed

‎src/bin/initdb/initdb.c‎

Lines changed: 40 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -257,6 +257,7 @@ void setup_signals(void);
257257
voidsetup_text_search(void);
258258
voidcreate_data_directory(void);
259259
voidcreate_xlog_symlink(void);
260+
voidwarn_on_mount_point(interror);
260261
voidinitialize_data_directory(void);
261262

262263

@@ -3144,7 +3145,9 @@ setup_signals(void)
31443145
void
31453146
create_data_directory(void)
31463147
{
3147-
switch (pg_check_dir(pg_data))
3148+
intret;
3149+
3150+
switch ((ret=pg_check_dir(pg_data)))
31483151
{
31493152
case0:
31503153
/* PGDATA not there, must create it */
@@ -3179,15 +3182,20 @@ create_data_directory(void)
31793182
break;
31803183

31813184
case2:
3185+
case3:
3186+
case4:
31823187
/* Present and not empty */
31833188
fprintf(stderr,
31843189
_("%s: directory \"%s\" exists but is not empty\n"),
31853190
progname,pg_data);
3186-
fprintf(stderr,
3187-
_("If you want to create a new database system, either remove or empty\n"
3188-
"the directory \"%s\" or run %s\n"
3189-
"with an argument other than \"%s\".\n"),
3190-
pg_data,progname,pg_data);
3191+
if (ret!=4)
3192+
warn_on_mount_point(ret);
3193+
else
3194+
fprintf(stderr,
3195+
_("If you want to create a new database system, either remove or empty\n"
3196+
"the directory \"%s\" or run %s\n"
3197+
"with an argument other than \"%s\".\n"),
3198+
pg_data,progname,pg_data);
31913199
exit(1);/* no further message needed */
31923200

31933201
default:
@@ -3206,6 +3214,7 @@ create_xlog_symlink(void)
32063214
if (strcmp(xlog_dir,"")!=0)
32073215
{
32083216
char*linkloc;
3217+
intret;
32093218

32103219
/* clean up xlog directory name, check it's absolute */
32113220
canonicalize_path(xlog_dir);
@@ -3216,7 +3225,7 @@ create_xlog_symlink(void)
32163225
}
32173226

32183227
/* check if the specified xlog directory exists/is empty */
3219-
switch (pg_check_dir(xlog_dir))
3228+
switch ((ret=pg_check_dir(xlog_dir)))
32203229
{
32213230
case0:
32223231
/* xlog directory not there, must create it */
@@ -3255,14 +3264,19 @@ create_xlog_symlink(void)
32553264
break;
32563265

32573266
case2:
3267+
case3:
3268+
case4:
32583269
/* Present and not empty */
32593270
fprintf(stderr,
32603271
_("%s: directory \"%s\" exists but is not empty\n"),
32613272
progname,xlog_dir);
3262-
fprintf(stderr,
3263-
_("If you want to store the transaction log there, either\n"
3264-
"remove or empty the directory \"%s\".\n"),
3265-
xlog_dir);
3273+
if (ret!=4)
3274+
warn_on_mount_point(ret);
3275+
else
3276+
fprintf(stderr,
3277+
_("If you want to store the transaction log there, either\n"
3278+
"remove or empty the directory \"%s\".\n"),
3279+
xlog_dir);
32663280
exit_nicely();
32673281

32683282
default:
@@ -3291,6 +3305,21 @@ create_xlog_symlink(void)
32913305
}
32923306

32933307

3308+
void
3309+
warn_on_mount_point(interror)
3310+
{
3311+
if (error==2)
3312+
fprintf(stderr,
3313+
_("It contains a dot-prefixed/invisible file, perhaps due to it being a mount point.\n"));
3314+
elseif (error==3)
3315+
fprintf(stderr,
3316+
_("It contains a lost+found directory, perhaps due to it being a mount point.\n"));
3317+
3318+
fprintf(stderr,
3319+
_("Using the top-level directory of a mount point is not recommended.\n"));
3320+
}
3321+
3322+
32943323
void
32953324
initialize_data_directory(void)
32963325
{

‎src/bin/pg_basebackup/pg_basebackup.c‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -371,6 +371,8 @@ verify_dir_is_empty_or_create(char *dirname)
371371
*/
372372
return;
373373
case2:
374+
case3:
375+
case4:
374376

375377
/*
376378
* Exists, not empty

‎src/port/pgcheckdir.c‎

Lines changed: 18 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -31,6 +31,7 @@ pg_check_dir(const char *dir)
3131
intresult=1;
3232
DIR*chkdir;
3333
structdirent*file;
34+
booldot_found= false;
3435

3536
errno=0;
3637

@@ -47,15 +48,26 @@ pg_check_dir(const char *dir)
4748
/* skip this and parent directory */
4849
continue;
4950
}
51+
#ifndefWIN32
52+
/* file starts with "." */
53+
elseif (file->d_name[0]== '.')
54+
{
55+
dot_found= true;
56+
}
57+
elseif (strcmp("lost+found",file->d_name)==0)
58+
{
59+
result=3;/* not empty, mount point */
60+
break;
61+
}
62+
#endif
5063
else
5164
{
52-
result=2;/* not empty */
65+
result=4;/* not empty */
5366
break;
5467
}
5568
}
5669

5770
#ifdefWIN32
58-
5971
/*
6072
* This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
6173
* released version
@@ -69,5 +81,9 @@ pg_check_dir(const char *dir)
6981
if (errno!=0)
7082
result=-1;/* some kind of I/O error? */
7183

84+
/* We report on dot-files if we _only_ find dot files */
85+
if (result==1&&dot_found)
86+
result=2;
87+
7288
returnresult;
7389
}

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