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Commit11d205e

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pg_ctl: improve handling of invalid data directory
Return '4' and report a meaningful error message when a non-existent orinvalid data directory is passed. Previously, pg_ctl would just reportthe server was not running.Patch by me and Amit KapilaReport from Peter Eisentraut
1 parent3624acd commit11d205e

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2 files changed

+39
-12
lines changed

2 files changed

+39
-12
lines changed

‎doc/src/sgml/ref/pg_ctl-ref.sgml

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -208,7 +208,8 @@ PostgreSQL documentation
208208
the specified data directory. If it is, the <acronym>PID</acronym>
209209
and the command line options that were used to invoke it are
210210
displayed. If the server is not running, the process returns an
211-
exit status of 3.
211+
exit status of 3. If an accessible data directory is not specified,
212+
the process returns an exit status of 4.
212213
</para>
213214

214215
<para>

‎src/bin/pg_ctl/pg_ctl.c

Lines changed: 37 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -97,6 +97,7 @@ static bool allow_core_files = false;
9797
statictime_tstart_time;
9898

9999
staticcharpostopts_file[MAXPGPATH];
100+
staticcharversion_file[MAXPGPATH];
100101
staticcharpid_file[MAXPGPATH];
101102
staticcharbackup_file[MAXPGPATH];
102103
staticcharrecovery_file[MAXPGPATH];
@@ -152,7 +153,7 @@ static void pgwin32_doRunAsService(void);
152153
staticintCreateRestrictedProcess(char*cmd,PROCESS_INFORMATION*processInfo,boolas_service);
153154
#endif
154155

155-
staticpgpid_tget_pgpid(void);
156+
staticpgpid_tget_pgpid(boolis_status_request);
156157
staticchar**readfile(constchar*path);
157158
staticvoidfree_readfile(char**optlines);
158159
staticintstart_postmaster(void);
@@ -246,10 +247,34 @@ print_msg(const char *msg)
246247
}
247248

248249
staticpgpid_t
249-
get_pgpid(void)
250+
get_pgpid(boolis_status_request)
250251
{
251252
FILE*pidf;
252253
longpid;
254+
structstatstatbuf;
255+
256+
if (stat(pg_data,&statbuf)!=0)
257+
{
258+
if (errno==ENOENT)
259+
printf(_("%s: directory \"%s\" does not exist\n"),progname,
260+
pg_data);
261+
else
262+
printf(_("%s: cannot access directory \"%s\"\n"),progname,
263+
pg_data);
264+
/*
265+
* The Linux Standard Base Core Specification 3.1 says this should return
266+
* '4, program or service status is unknown'
267+
* https://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
268+
*/
269+
exit(is_status_request ?4 :1);
270+
}
271+
272+
if (stat(version_file,&statbuf)!=0&&errno==ENOENT)
273+
{
274+
printf(_("%s: directory \"%s\" is not a database cluster directory\n"),
275+
progname,pg_data);
276+
exit(is_status_request ?4 :1);
277+
}
253278

254279
pidf=fopen(pid_file,"r");
255280
if (pidf==NULL)
@@ -810,7 +835,7 @@ do_start(void)
810835

811836
if (ctl_command!=RESTART_COMMAND)
812837
{
813-
old_pid=get_pgpid();
838+
old_pid=get_pgpid(false);
814839
if (old_pid!=0)
815840
write_stderr(_("%s: another server might be running; "
816841
"trying to start server anyway\n"),
@@ -894,7 +919,7 @@ do_stop(void)
894919
pgpid_tpid;
895920
structstatstatbuf;
896921

897-
pid=get_pgpid();
922+
pid=get_pgpid(false);
898923

899924
if (pid==0)/* no pid file */
900925
{
@@ -943,7 +968,7 @@ do_stop(void)
943968

944969
for (cnt=0;cnt<wait_seconds;cnt++)
945970
{
946-
if ((pid=get_pgpid())!=0)
971+
if ((pid=get_pgpid(false))!=0)
947972
{
948973
print_msg(".");
949974
pg_usleep(1000000);/* 1 sec */
@@ -980,7 +1005,7 @@ do_restart(void)
9801005
pgpid_tpid;
9811006
structstatstatbuf;
9821007

983-
pid=get_pgpid();
1008+
pid=get_pgpid(false);
9841009

9851010
if (pid==0)/* no pid file */
9861011
{
@@ -1033,7 +1058,7 @@ do_restart(void)
10331058

10341059
for (cnt=0;cnt<wait_seconds;cnt++)
10351060
{
1036-
if ((pid=get_pgpid())!=0)
1061+
if ((pid=get_pgpid(false))!=0)
10371062
{
10381063
print_msg(".");
10391064
pg_usleep(1000000);/* 1 sec */
@@ -1071,7 +1096,7 @@ do_reload(void)
10711096
{
10721097
pgpid_tpid;
10731098

1074-
pid=get_pgpid();
1099+
pid=get_pgpid(false);
10751100
if (pid==0)/* no pid file */
10761101
{
10771102
write_stderr(_("%s: PID file \"%s\" does not exist\n"),progname,pid_file);
@@ -1110,7 +1135,7 @@ do_promote(void)
11101135
pgpid_tpid;
11111136
structstatstatbuf;
11121137

1113-
pid=get_pgpid();
1138+
pid=get_pgpid(false);
11141139

11151140
if (pid==0)/* no pid file */
11161141
{
@@ -1204,7 +1229,7 @@ do_status(void)
12041229
{
12051230
pgpid_tpid;
12061231

1207-
pid=get_pgpid();
1232+
pid=get_pgpid(true);
12081233
/* Is there a pid file? */
12091234
if (pid!=0)
12101235
{
@@ -1247,7 +1272,7 @@ do_status(void)
12471272

12481273
/*
12491274
* The Linux Standard Base Core Specification 3.1 says this should return
1250-
* '3'
1275+
* '3, program is not running'
12511276
* https://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
12521277
*/
12531278
exit(3);
@@ -2285,6 +2310,7 @@ main(int argc, char **argv)
22852310
if (pg_data)
22862311
{
22872312
snprintf(postopts_file,MAXPGPATH, "%s/postmaster.opts",pg_data);
2313+
snprintf(version_file,MAXPGPATH, "%s/PG_VERSION",pg_data);
22882314
snprintf(pid_file,MAXPGPATH, "%s/postmaster.pid",pg_data);
22892315
snprintf(backup_file,MAXPGPATH, "%s/backup_label",pg_data);
22902316
snprintf(recovery_file,MAXPGPATH, "%s/recovery.conf",pg_data);

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