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Commit51e61b0

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Ensure pg_ctl behaves sanely when data directory is not specified.
Commitaaa6e1d introduced multiple hazardsin the case where pg_ctl is executed with neither a -D switch nor anyPGDATA environment variable. It would dump core on machines which areunforgiving about printf("%s", NULL), or failing that possibly give arather unhelpful complaint about being unable to execute "postgres -C",rather than the logically prior complaint about not being told where thedata directory is.Edmund Horner's report suggests that there is another, Windows-specifichazard here, but I'm not the person to fix that; it would in any case onlybe significant when trying to use a config-only PGDATA pointer.
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‎src/bin/pg_ctl/pg_ctl.c

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@@ -1902,6 +1902,10 @@ adjust_data_dir(void)
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*my_exec_path;
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FILE*fd;
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/* do nothing if we're working without knowledge of data dir */
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if (pg_config==NULL)
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return;
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/* If there is no postgresql.conf, it can't be a config-only dir */
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snprintf(filename,sizeof(filename),"%s/postgresql.conf",pg_config);
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if ((fd=fopen(filename,"r"))==NULL)
@@ -2188,8 +2192,10 @@ main(int argc, char **argv)
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pg_data=xstrdup(pg_config);
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}
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/* -D might point at config-only directory; if so find the real PGDATA */
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adjust_data_dir();
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/* Complain if -D needed and not provided */
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if (pg_config==NULL&&
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ctl_command!=KILL_COMMAND&&ctl_command!=UNREGISTER_COMMAND)
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{

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