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Add support for include_dir in config file.

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This allows easily splitting configuration into many files, deployed in a
directory.

Magnus Hagander, Greg Smith, Selena Deckelmann, reviewed by Noah Misch.
This commit is contained in:
Heikki Linnakangas 2012-09-24 17:55:53 +03:00
parent ce9eee39d1
commit 2a0c81a12c
4 changed files with 291 additions and 63 deletions
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150
doc/src/sgml/config.sgml
View File

@ -79,38 +79,6 @@ shared_buffers = 128MB
value, write either two quotes (preferred) or backslash-quote.
</para>
<para>
<indexterm>
<primary><literal>include</></primary>
<secondary>in configuration file</secondary>
</indexterm>
In addition to parameter settings, the <filename>postgresql.conf</>
file can contain <firstterm>include directives</>, which specify
another file to read and process as if it were inserted into the
configuration file at this point. This feature allows a configuration
file to be divided into physically separate parts.
Include directives simply look like:
<programlisting>
include 'filename'
</programlisting>
If the file name is not an absolute path, it is taken as relative to
the directory containing the referencing configuration file.
Inclusions can be nested.
</para>
<para>
<indexterm>
<primary><literal>include_if_exists</></primary>
<secondary>in configuration file</secondary>
</indexterm>
There is also an <literal>include_if_exists</> directive, which acts
the same as the <literal>include</> directive, except for the behavior
when the referenced file does not exist or cannot be read. A regular
<literal>include</> will consider this an error condition, but
<literal>include_if_exists</> merely logs a message and continues
processing the referencing configuration file.
</para>
<para>
<indexterm>
<primary>SIGHUP</primary>
@ -213,7 +181,123 @@ SET ENABLE_SEQSCAN TO OFF;
</para>
</sect2>
</sect1>
<sect2 id="config-includes">
<title>Configuration File Includes</title>
<para>
<indexterm>
<primary><literal>include</></primary>
<secondary>in configuration file</secondary>
</indexterm>
In addition to parameter settings, the <filename>postgresql.conf</>
file can contain <firstterm>include directives</>, which specify
another file to read and process as if it were inserted into the
configuration file at this point. This feature allows a configuration
file to be divided into physically separate parts.
Include directives simply look like:
<programlisting>
include 'filename'
</programlisting>
If the file name is not an absolute path, it is taken as relative to
the directory containing the referencing configuration file.
Inclusions can be nested.
</para>
<para>
<indexterm>
<primary><literal>include_if_exists</></primary>
<secondary>in configuration file</secondary>
</indexterm>
There is also an <literal>include_if_exists</> directive, which acts
the same as the <literal>include</> directive, except for the behavior
when the referenced file does not exist or cannot be read. A regular
<literal>include</> will consider this an error condition, but
<literal>include_if_exists</> merely logs a message and continues
processing the referencing configuration file.
</para>
<para>
<indexterm>
<primary><literal>include_dir</></primary>
<secondary>in configuration file</secondary>
</indexterm>
The <filename>postgresql.conf</> file can also contain
<firstterm>include_dir directives</>, which specify an entire directory
of configuration files to include. It is used similarly:
<programlisting>
include_dir 'directory'
</programlisting>
Non-absolute directory names follow the same rules as single file include
directives: they are relative to the directory containing the referencing
configuration file. Within that directory, only non-directory files whose
names end with the suffix <literal>.conf</literal> will be included. File
names that start with the <literal>.</literal> character are also excluded,
to prevent mistakes as they are hidden on some platforms. Multiple files
within an include directory are processed in filename order. The filenames
are ordered by C locale rules, ie. numbers before letters, and uppercase
letters before lowercase ones.
</para>
<para>
Include files or directories can be used to logically separate portions
of the database configuration, rather than having a single large
<filename>postgresql.conf</> file. Consider a company that has two
database servers, each with a different amount of memory. There are likely
elements of the configuration both will share, for things such as logging.
But memory-related parameters on the server will vary between the two. And
there might be server specific customizations, too. One way to manage this
situation is to break the custom configuration changes for your site into
three files. You could add this to the end of your
<filename>postgresql.conf</> file to include them:
<programlisting>
include 'shared.conf'
include 'memory.conf'
include 'server.conf'
</programlisting>
All systems would have the same <filename>shared.conf</>. Each server
with a particular amount of memory could share the same
<filename>memory.conf</>; you might have one for all servers with 8GB of RAM,
another for those having 16GB. And finally <filename>server.conf</> could
have truly server-specific configuration information in it.
</para>
<para>
Another possibility is to create a configuration file directory and
put this information into files there. For example, a <filename>conf.d</>
directory could be referenced at the end of<filename>postgresql.conf</>:
<screen>
include_dir 'conf.d'
</screen>
Then you could name the files in the <filename>conf.d</> directory like this:
<screen>
00shared.conf
01memory.conf
02server.conf
</screen>
This shows a clear order in which these files will be loaded. This is
important because only the last setting encountered when the server is
reading its configuration will be used. Something set in
<filename>conf.d/02server.conf</> in this example would override a value
set in <filename>conf.d/01memory.conf</>.
</para>
<para>
You might instead use this configuration directory approach while naming
these files more descriptively:
<screen>
00shared.conf
01memory-8GB.conf
02server-foo.conf
</screen>
This sort of arrangement gives a unique name for each configuration file
variation. This can help eliminate ambiguity when several servers have
their configurations all stored in one place, such as in a version
control repository. (Storing database configuration files under version
control is another good practice to consider).
</para>
</sect2>
</sect1>
<sect1 id="runtime-config-file-locations">
<title>File Locations</title>

188
src/backend/utils/misc/guc-file.l
View File

@ -362,6 +362,39 @@ ProcessConfigFile(GucContext context)
}
}
/*
* Given a configuration file or directory location that may be a relative
* path, return an absolute one. We consider the location to be relative to
* the directory holding the calling file.
*/
static char *
AbsoluteConfigLocation(const char *location, const char *calling_file)
{
char abs_path[MAXPGPATH];
if (is_absolute_path(location))
return pstrdup(location);
else
{
if (calling_file != NULL)
{
strlcpy(abs_path, calling_file, sizeof(abs_path));
get_parent_directory(abs_path);
join_path_components(abs_path, abs_path, location);
canonicalize_path(abs_path);
}
else
{
/*
* calling_file is NULL, we make an absolute path from $PGDATA
*/
join_path_components(abs_path, data_directory, location);
canonicalize_path(abs_path);
}
return pstrdup(abs_path);
}
}
/*
* Read and parse a single configuration file. This function recurses
* to handle "include" directives.
@ -378,7 +411,6 @@ ParseConfigFile(const char *config_file, const char *calling_file, bool strict,
{
bool OK = true;
FILE *fp;
char abs_path[MAXPGPATH];
/*
* Reject too-deep include nesting depth. This is just a safety check
@ -394,31 +426,7 @@ ParseConfigFile(const char *config_file, const char *calling_file, bool strict,
return false;
}
/*
* If config_file is a relative path, convert to absolute. We consider
* it to be relative to the directory holding the calling file.
*/
if (!is_absolute_path(config_file))
{
if (calling_file != NULL)
{
strlcpy(abs_path, calling_file, sizeof(abs_path));
get_parent_directory(abs_path);
join_path_components(abs_path, abs_path, config_file);
canonicalize_path(abs_path);
config_file = abs_path;
}
else
{
/*
* calling_file is NULL, we make an absolute path from $PGDATA
*/
join_path_components(abs_path, data_directory, config_file);
canonicalize_path(abs_path);
config_file = abs_path;
}
}
config_file = AbsoluteConfigLocation(config_file,calling_file);
fp = AllocateFile(config_file, "r");
if (!fp)
{
@ -563,7 +571,22 @@ ParseConfigFp(FILE *fp, const char *config_file, int depth, int elevel,
}
/* OK, process the option name and value */
if (guc_name_compare(opt_name, "include_if_exists") == 0)
if (guc_name_compare(opt_name, "include_dir") == 0)
{
/*
* An include_dir directive isn't a variable and should be
* processed immediately.
*/
if (!ParseConfigDirectory(opt_value, config_file,
depth + 1, elevel,
head_p, tail_p))
OK = false;
yy_switch_to_buffer(lex_buffer);
ConfigFileLineno = save_ConfigFileLineno;
pfree(opt_name);
pfree(opt_value);
}
else if (guc_name_compare(opt_name, "include_if_exists") == 0)
{
/*
* An include_if_exists directive isn't a variable and should be
@ -573,9 +596,9 @@ ParseConfigFp(FILE *fp, const char *config_file, int depth, int elevel,
depth + 1, elevel,
head_p, tail_p))
OK = false;
yy_switch_to_buffer(lex_buffer);
pfree(opt_name);
pfree(opt_value);
yy_switch_to_buffer(lex_buffer);
pfree(opt_name);
pfree(opt_value);
}
else if (guc_name_compare(opt_name, "include") == 0)
{
@ -665,6 +688,111 @@ cleanup:
return OK;
}
/*
* Read and parse all config files in a subdirectory in alphabetical order
*/
bool
ParseConfigDirectory(const char *includedir,
const char *calling_file,
int depth, int elevel,
ConfigVariable **head_p,
ConfigVariable **tail_p)
{
char *directory;
DIR *d;
struct dirent *de;
char **filenames = NULL;
int num_filenames = 0;
int size_filenames = 0;
bool status;
directory = AbsoluteConfigLocation(includedir, calling_file);
d = AllocateDir(directory);
if (d == NULL)
{
ereport(elevel,
(errcode_for_file_access(),
errmsg("could not open configuration directory \"%s\": %m",
directory)));
return false;
}
/*
* Read the directory and put the filenames in an array, so we can sort
* them prior to processing the contents.
*/
while ((de = ReadDir(d, directory)) != NULL)
{
struct stat st;
char filename[MAXPGPATH];
/*
* Only parse files with names ending in ".conf". Explicitly reject
* files starting with ".". This excludes things like "." and "..",
* as well as typical hidden files, backup files, and editor debris.
*/
if (strlen(de->d_name) < 6)
continue;
if (de->d_name[0] == '.')
continue;
if (strcmp(de->d_name + strlen(de->d_name) - 5, ".conf") != 0)
continue;
join_path_components(filename, directory, de->d_name);
canonicalize_path(filename);
if (stat(filename, &st) == 0)
{
if (!S_ISDIR(st.st_mode))
{
/* Add file to list, increasing its size in blocks of 32 */
if (num_filenames == size_filenames)
{
size_filenames += 32;
if (num_filenames == 0)
/* Must initialize, repalloc won't take NULL input */
filenames = palloc(size_filenames * sizeof(char *));
else
filenames = repalloc(filenames, size_filenames * sizeof(char *));
}
filenames[num_filenames] = pstrdup(filename);
num_filenames++;
}
}
else
{
/*
* stat does not care about permissions, so the most likely reason
* a file can't be accessed now is if it was removed between the
* directory listing and now.
*/
ereport(elevel,
(errcode_for_file_access(),
errmsg("could not stat file \"%s\": %m",
filename)));
return false;
}
}
if (num_filenames > 0)
{
int i;
qsort(filenames, num_filenames, sizeof(char *), pg_qsort_strcmp);
for (i = 0; i < num_filenames; i++)
{
if (!ParseConfigFile(filenames[i], NULL, true,
depth, elevel, head_p, tail_p))
{
status = false;
goto cleanup;
}
}
}
status = true;
cleanup:
FreeDir(d);
return status;
}
/*
* Free a list of ConfigVariables, including the names and the values

11
src/backend/utils/misc/postgresql.conf.sample
View File

@ -566,6 +566,17 @@
#exit_on_error = off # terminate session on any error?
#restart_after_crash = on # reinitialize after backend crash?
#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------
# These options allow settings to be loaded from files other than the
# default postgresql.conf
#include_dir = 'conf.d' # include files ending in '.conf' from
# directory 'conf.d'
#include_if_exists = 'exists.conf' # include file only if it exists
#include = 'special.conf' # include file
#------------------------------------------------------------------------------
# CUSTOMIZED OPTIONS

5
src/include/utils/guc.h
View File

@ -116,6 +116,11 @@ extern bool ParseConfigFile(const char *config_file, const char *calling_file,
extern bool ParseConfigFp(FILE *fp, const char *config_file,
int depth, int elevel,
ConfigVariable **head_p, ConfigVariable **tail_p);
extern bool ParseConfigDirectory(const char *includedir,
const char *calling_file,
int depth, int elevel,
ConfigVariable **head_p,
ConfigVariable **tail_p);
extern void FreeConfigVariables(ConfigVariable *list);
/*