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Add pg_file_settings view and function

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The function and view added here provide a way to look at all settings
in postgresql.conf, any #include'd files, and postgresql.auto.conf
(which is what backs the ALTER SYSTEM command).

The information returned includes the configuration file name, line
number in that file, sequence number indicating when the parameter is
loaded (useful to see if it is later masked by another definition of the
same parameter), parameter name, and what it is set to at that point.
This information is updated on reload of the server.

This is unfiltered, privileged, information and therefore access is
restricted to superusers through the GRANT system.

Author: Sawada Masahiko, various improvements by me.
Reviewers: David Steele
This commit is contained in:
Stephen Frost
2015-05-08 19:09:26 -04:00
parent bab64ef9e8
commit a97e0c3354
7 changed files with 263 additions and 0 deletions
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50
src/backend/utils/misc/guc-file.l
View File

@@ -120,6 +120,7 @@ ProcessConfigFile(GucContext context)
*head,
*tail;
int i;
int file_variables_count = 0;
/*
* Config files are processed on startup (by the postmaster only)
@@ -255,6 +256,7 @@ ProcessConfigFile(GucContext context)
error = true;
ConfFileWithError = item->filename;
}
file_variables_count++;
}
/*
@@ -341,6 +343,54 @@ ProcessConfigFile(GucContext context)
PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
}
/*
* Check if we have allocated the array yet.
*
* If not, allocate it based on the number of file variables we have seen.
*/
if (!guc_file_variables)
{
/* For the first call */
num_guc_file_variables = file_variables_count;
guc_file_variables = (ConfigFileVariable *) guc_malloc(FATAL,
num_guc_file_variables * sizeof(struct ConfigFileVariable));
}
else
{
int i;
/* Free all of the previously allocated entries */
for (i = 0; i < num_guc_file_variables; i++)
{
free(guc_file_variables[i].name);
free(guc_file_variables[i].value);
free(guc_file_variables[i].filename);
}
/* Update the global count and realloc based on the new size */
num_guc_file_variables = file_variables_count;
guc_file_variables = (ConfigFileVariable *) guc_realloc(FATAL,
guc_file_variables,
num_guc_file_variables * sizeof(struct ConfigFileVariable));
}
/*
* Copy the settings which came from the files read into the
* guc_file_variables array which backs the pg_show_file_settings()
* function.
*/
for (item = head, i = 0; item && i < num_guc_file_variables;
item = item->next, i++)
{
guc_file_variables[i].name = guc_strdup(FATAL, item->name);
guc_file_variables[i].value = guc_strdup(FATAL, item->value);
guc_file_variables[i].filename = guc_strdup(FATAL, item->filename);
guc_file_variables[i].sourceline = item->sourceline;
}
/* We had better have made it through the loop above to a clean ending. */
Assert(!item && i == num_guc_file_variables);
/*
* Now apply the values from the config file.
*/