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Remember the source GucContext for each GUC parameter.

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We used to just remember the GucSource, but saving GucContext too provides
a little more information --- notably, whether a SET was done by a
superuser or regular user.  This allows us to rip out the fairly dodgy code
that define_custom_variable used to use to try to infer the context to
re-install a pre-existing setting with.  In particular, it now works for
a superuser to SET a extension's SUSET custom variable before loading the
associated extension, because GUC can remember whether the SET was done as
a superuser or not.  The plperl regression tests contain an example where
this is useful.
This commit is contained in:
Tom Lane
2011-10-04 16:13:16 -04:00
parent 09e196e453
commit 9f5836d224
9 changed files with 73 additions and 81 deletions
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14
src/include/utils/guc_tables.h
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@ -118,9 +118,11 @@ typedef struct guc_stack
int nest_level; /* nesting depth at which we made entry */
GucStackState state; /* see enum above */
GucSource source; /* source of the prior value */
/* masked value's source must be PGC_S_SESSION, so no need to store it */
GucContext scontext; /* context that set the prior value */
GucContext masked_scontext; /* context that set the masked value */
config_var_value prior; /* previous value of variable */
config_var_value masked; /* SET value in a GUC_SET_LOCAL entry */
/* masked value's source must be PGC_S_SESSION, so no need to store it */
} GucStack;
/*
@ -143,21 +145,21 @@ struct config_generic
enum config_group group; /* to help organize variables by function */
const char *short_desc; /* short desc. of this variable's purpose */
const char *long_desc; /* long desc. of this variable's purpose */
int flags; /* flag bits, see below */
int flags; /* flag bits, see guc.h */
/* variable fields, initialized at runtime: */
enum config_type vartype; /* type of variable (set only at startup) */
int status; /* status bits, see below */
GucSource reset_source; /* source of the reset_value */
GucSource source; /* source of the current actual value */
GucSource reset_source; /* source of the reset_value */
GucContext scontext; /* context that set the current value */
GucContext reset_scontext; /* context that set the reset value */
GucStack *stack; /* stacked prior values */
void *extra; /* "extra" pointer for current actual value */
char *sourcefile; /* file current setting is from (NULL if not
* file) */
* set in config file) */
int sourceline; /* line in source file */
};
/* bit values in flags field are defined in guc.h */
/* bit values in status field */
#define GUC_IS_IN_FILE 0x0001 /* found it in config file */
/*