Commit7df974e

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Disallow superuser names starting with 'pg_' in initdb

As with CREATE ROLE, disallow users from specifying initialsuperuser names which begin with 'pg_' in initdb.Per discussion with Tom.

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Original file line number	Diff line number	Diff line change
`@@ -3562,6 +3562,12 @@ main(int argc, char *argv[])`
`3562`	`3562`	`if (strlen(username)==0)`
`3563`	`3563`	`username=effective_user;`
`3564`	`3564`
	`3565`	`+if (strncmp(username,"pg_",3)==0)`
	`3566`	`+{`
	`3567`	`+fprintf(stderr,_("%s: superuser name \"%s\" is reserved; role names can not begin with 'pg_'\n"),progname,username);`
	`3568`	`+exit(1);`
	`3569`	`+}`
	`3570`	`+`
`3565`	`3571`	`printf(_("The files belonging to this database system will be owned "`
`3566`	`3572`	`"by user \"%s\".\n"`
`3567`	`3573`	`"This user must also own the server process.\n\n"),`

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