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Commitaaa6e1d

Browse files
committed
Add postmaster -C option to query configuration parameters, and have
pg_ctl use that to query the data directory for config-only installs.This fixes awkward or impossible pg_ctl operation for config-onlyinstalls.
1 parent7f3bd86 commitaaa6e1d

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5 files changed

+100
-10
lines changed

5 files changed

+100
-10
lines changed

‎doc/src/sgml/ref/postgres-ref.sgml‎

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -140,6 +140,20 @@ PostgreSQL documentation
140140
</listitem>
141141
</varlistentry>
142142

143+
<varlistentry>
144+
<term><option>-C <replaceable>name</replaceable></option></term>
145+
<listitem>
146+
<para>
147+
Returns the value of a named run-time parameter, and exits.
148+
(See the <option>-c</> option above for details.) This can
149+
be used on a running server, and returns values from
150+
<filename>postgresql.conf</>, modified by any parameters
151+
supplied in this invocation. It does not reflect parameters
152+
supplied when the cluster was started.
153+
</para>
154+
</listitem>
155+
</varlistentry>
156+
143157
<varlistentry>
144158
<term><option>-d <replaceable>debug-level</replaceable></option></term>
145159
<listitem>

‎src/backend/main/main.c‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -283,6 +283,7 @@ help(const char *progname)
283283
#endif
284284
printf(_(" -B NBUFFERS number of shared buffers\n"));
285285
printf(_(" -c NAME=VALUE set run-time parameter\n"));
286+
printf(_(" -C NAME return run-time parameter\n"));
286287
printf(_(" -d 1-5 debugging level\n"));
287288
printf(_(" -D DATADIR database directory\n"));
288289
printf(_(" -e use European date input format (DMY)\n"));

‎src/backend/postmaster/postmaster.c‎

Lines changed: 14 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -203,6 +203,8 @@ boolenable_bonjour = false;
203203
char*bonjour_name;
204204
boolrestart_after_crash= true;
205205

206+
char*output_config_variable=NULL;
207+
206208
/* PIDs of special child processes; 0 when not running */
207209
staticpid_tStartupPID=0,
208210
BgWriterPID=0,
@@ -537,7 +539,7 @@ PostmasterMain(int argc, char *argv[])
537539
* tcop/postgres.c (the option sets should not conflict) and with the
538540
* common help() function in main/main.c.
539541
*/
540-
while ((opt=getopt(argc,argv,"A:B:bc:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:W:-:"))!=-1)
542+
while ((opt=getopt(argc,argv,"A:B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:W:-:"))!=-1)
541543
{
542544
switch (opt)
543545
{
@@ -554,6 +556,10 @@ PostmasterMain(int argc, char *argv[])
554556
IsBinaryUpgrade= true;
555557
break;
556558

559+
case'C':
560+
output_config_variable=optarg;
561+
break;
562+
557563
case'D':
558564
userDoption=optarg;
559565
break;
@@ -728,6 +734,13 @@ PostmasterMain(int argc, char *argv[])
728734
if (!SelectConfigFiles(userDoption,progname))
729735
ExitPostmaster(2);
730736

737+
if (output_config_variable!=NULL)
738+
{
739+
/* permission is handled because the user is reading inside the data dir */
740+
puts(GetConfigOption(output_config_variable, false, false));
741+
ExitPostmaster(0);
742+
}
743+
731744
/* Verify that DataDir looks reasonable */
732745
checkDataDir();
733746

‎src/backend/tcop/postgres.c‎

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -3170,7 +3170,7 @@ process_postgres_switches(int argc, char *argv[], GucContext ctx)
31703170
* postmaster/postmaster.c (the option sets should not conflict) and with
31713171
* the common help() function in main/main.c.
31723172
*/
3173-
while ((flag=getopt(argc,argv,"A:B:bc:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:v:W:-:"))!=-1)
3173+
while ((flag=getopt(argc,argv,"A:B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:v:W:-:"))!=-1)
31743174
{
31753175
switch (flag)
31763176
{
@@ -3187,6 +3187,10 @@ process_postgres_switches(int argc, char *argv[], GucContext ctx)
31873187
IsBinaryUpgrade= true;
31883188
break;
31893189

3190+
case'C':
3191+
/* ignored for consistency with the postmaster */
3192+
break;
3193+
31903194
case'D':
31913195
if (secure)
31923196
userDoption=strdup(optarg);
@@ -3272,7 +3276,7 @@ process_postgres_switches(int argc, char *argv[], GucContext ctx)
32723276
break;
32733277

32743278
case'T':
3275-
/* ignored for consistency with postmaster */
3279+
/* ignored for consistency withthepostmaster */
32763280
break;
32773281

32783282
case't':

‎src/bin/pg_ctl/pg_ctl.c‎

Lines changed: 65 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -81,6 +81,7 @@ static ShutdownMode shutdown_mode = SMART_MODE;
8181
staticintsig=SIGTERM;/* default */
8282
staticCtlCommandctl_command=NO_COMMAND;
8383
staticchar*pg_data=NULL;
84+
staticchar*pg_config=NULL;
8485
staticchar*pgdata_opt=NULL;
8586
staticchar*post_opts=NULL;
8687
staticconstchar*progname;
@@ -131,6 +132,7 @@ static void do_status(void);
131132
staticvoiddo_promote(void);
132133
staticvoiddo_kill(pgpid_tpid);
133134
staticvoidprint_msg(constchar*msg);
135+
staticvoidadjust_data_dir(void);
134136

135137
#if defined(WIN32)|| defined(__CYGWIN__)
136138
staticboolpgwin32_IsInstalled(SC_HANDLE);
@@ -1265,10 +1267,10 @@ pgwin32_CommandLine(bool registration)
12651267
strcat(cmdLine,"\"");
12661268
}
12671269

1268-
if (pg_data)
1270+
if (pg_config)
12691271
{
12701272
strcat(cmdLine," -D \"");
1271-
strcat(cmdLine,pg_data);
1273+
strcat(cmdLine,pg_config);
12721274
strcat(cmdLine,"\"");
12731275
}
12741276

@@ -1886,6 +1888,59 @@ set_starttype(char *starttypeopt)
18861888
}
18871889
#endif
18881890

1891+
/*
1892+
* adjust_data_dir
1893+
*
1894+
* If a configuration-only directory was specified, find the real data dir.
1895+
*/
1896+
void
1897+
adjust_data_dir(void)
1898+
{
1899+
charcmd[MAXPGPATH],filename[MAXPGPATH],*my_exec_path;
1900+
FILE*fd;
1901+
1902+
/* If there is no postgresql.conf, it can't be a config-only dir */
1903+
snprintf(filename,sizeof(filename),"%s/postgresql.conf",pg_config);
1904+
if ((fd=fopen(filename,"r"))==NULL)
1905+
return;
1906+
fclose(fd);
1907+
1908+
/* If PG_VERSION exists, it can't be a config-only dir */
1909+
snprintf(filename,sizeof(filename),"%s/PG_VERSION",pg_config);
1910+
if ((fd=fopen(filename,"r"))!=NULL)
1911+
{
1912+
fclose(fd);
1913+
return;
1914+
}
1915+
1916+
/* Must be a configuration directory, so find the data directory */
1917+
1918+
/* we use a private my_exec_path to avoid interfering with later uses */
1919+
if (exec_path==NULL)
1920+
my_exec_path=find_other_exec_or_die(argv0,"postgres",PG_BACKEND_VERSIONSTR);
1921+
else
1922+
my_exec_path=xstrdup(exec_path);
1923+
1924+
snprintf(cmd,MAXPGPATH,SYSTEMQUOTE"\"%s\" %s%s -C data_directory"SYSTEMQUOTE,
1925+
my_exec_path,pgdata_opt ?pgdata_opt :"",post_opts ?
1926+
post_opts :"");
1927+
1928+
fd=popen(cmd,"r");
1929+
if (fd==NULL||fgets(filename,sizeof(filename),fd)==NULL)
1930+
{
1931+
write_stderr(_("%s: cannot find the data directory using %s\n"),progname,my_exec_path);
1932+
exit(1);
1933+
}
1934+
pclose(fd);
1935+
free(my_exec_path);
1936+
1937+
if (strlen(filename)>0&&filename[strlen(filename)-1]=='\n')
1938+
filename[strlen(filename)-1]='\0';
1939+
free(pg_data);
1940+
pg_data=xstrdup(filename);
1941+
canonicalize_path(pg_data);
1942+
}
1943+
18891944

18901945
int
18911946
main(intargc,char**argv)
@@ -2120,14 +2175,17 @@ main(int argc, char **argv)
21202175
}
21212176

21222177
/* Note we put any -D switch into the env var above */
2123-
pg_data=getenv("PGDATA");
2124-
if (pg_data)
2178+
pg_config=getenv("PGDATA");
2179+
if (pg_config)
21252180
{
2126-
pg_data=xstrdup(pg_data);
2127-
canonicalize_path(pg_data);
2181+
pg_config=xstrdup(pg_config);
2182+
canonicalize_path(pg_config);
2183+
pg_data=xstrdup(pg_config);
21282184
}
21292185

2130-
if (pg_data==NULL&&
2186+
adjust_data_dir();
2187+
2188+
if (pg_config==NULL&&
21312189
ctl_command!=KILL_COMMAND&&ctl_command!=UNREGISTER_COMMAND)
21322190
{
21332191
write_stderr(_("%s:nodatabasedirectoryspecifiedandenvironmentvariablePGDATAunset\n"),

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