Hi all,
On [1] it was mentioned that it could be a good idea to include the
extension location when listening the available extensions on
pg_available_extensions to make it clear to the user the location of an
extension that Postgres is seeing based on the extension_control_path
GUC.
The attached patch implements this idea. Extensions installed on $system
path will not show the actual value of the $system macro and it will
show the macro itself, for example:
postgres=# show extension_control_path;
extension_control_path
---------------------------------------------------
/usr/local/my/extensions/share/postgresql:$system
(1 row)
postgres=# select * from pg_available_extensions;
name | default_version | installed_version | comment
| location
---------+-----------------+-------------------+--------------------------------------------------+---------------------------------------------------
envvar | 1.0.0 | | Get the value of a server
environment variable | /usr/local/my/extensions/share/postgresql/extension
amcheck | 1.5 | | functions for verifying
relation integrity | $system
bloom | 1.0 | | bloom access method -
signature file based index | $system
I'm not sure if this should be included on 18 release since this is not
a bug fix but an improvement on the extension system by itself.
Any opinions on this?
[1]
https://www.postgresql.org/message-id/CAKFQuwbR1Fzr8yRuMW%3DN1UMA1cTpFcqZe9bW_-ZF8%3DBa2Ud2%3Dw%40mail.gmail.com
--
Matheus Alcantara
From 7a1c93f344c61c21f56692fe8eff77e5092929c0 Mon Sep 17 00:00:00 2001
From: Matheus Alcantara <mths....@pm.me>
Date: Mon, 15 Sep 2025 15:46:24 -0300
Subject: [PATCH v1] Add path of extension on pg_available_extensions
---
src/backend/catalog/system_views.sql | 4 +-
src/backend/commands/extension.c | 80 ++++++++++++++-----
src/include/catalog/pg_proc.dat | 10 +--
.../t/001_extension_control_path.pl | 13 ++-
src/test/regress/expected/rules.out | 10 ++-
5 files changed, 83 insertions(+), 34 deletions(-)
diff --git a/src/backend/catalog/system_views.sql
b/src/backend/catalog/system_views.sql
index c77fa0234bb..8e3bc61fe4a 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -402,14 +402,14 @@ CREATE VIEW pg_cursors AS
CREATE VIEW pg_available_extensions AS
SELECT E.name, E.default_version, X.extversion AS installed_version,
- E.comment
+ E.comment, E.location
FROM pg_available_extensions() AS E
LEFT JOIN pg_extension AS X ON E.name = X.extname;
CREATE VIEW pg_available_extension_versions AS
SELECT E.name, E.version, (X.extname IS NOT NULL) AS installed,
E.superuser, E.trusted, E.relocatable,
- E.schema, E.requires, E.comment
+ E.schema, E.requires, E.comment, E.location
FROM pg_available_extension_versions() AS E
LEFT JOIN pg_extension AS X
ON E.name = X.extname AND E.version = X.extversion;
diff --git a/src/backend/commands/extension.c b/src/backend/commands/extension.c
index 93ef1ad106f..3f8e74f1211 100644
--- a/src/backend/commands/extension.c
+++ b/src/backend/commands/extension.c
@@ -126,6 +126,19 @@ typedef struct
ParseLoc stmt_len; /* length in bytes; 0 means
"rest of string" */
} script_error_callback_arg;
+/*
+ * A location configured on extension_control_path GUC.
+ *
+ * The macro is the macro plaeholder that the extension_control_path support
+ * and which is replaced by a system value that is stored on loc. For custom
+ * paths that don't have a macro the macro field is NULL.
+ */
+typedef struct
+{
+ char *macro;
+ char *loc;
+} Location;
+
/* Local functions */
static List *find_update_path(List *evi_list,
ExtensionVersionInfo
*evi_start,
@@ -140,7 +153,8 @@ static Oid get_required_extension(char *reqExtensionName,
bool
is_create);
static void get_available_versions_for_extension(ExtensionControlFile
*pcontrol,
Tuplestorestate *tupstore,
-
TupleDesc tupdesc);
+
TupleDesc tupdesc,
+
Location *location);
static Datum convert_requires_to_datum(List *requires);
static void ApplyExtensionUpdates(Oid extensionOid,
ExtensionControlFile *pcontrol,
@@ -354,7 +368,11 @@ get_extension_control_directories(void)
if (strlen(Extension_control_path) == 0)
{
- paths = lappend(paths, system_dir);
+ Location *location = palloc0_object(Location);
+
+ location->macro = NULL;
+ location->loc = system_dir;
+ paths = lappend(paths, location);
}
else
{
@@ -366,6 +384,7 @@ get_extension_control_directories(void)
int len;
char *mangled;
char *piece = first_path_var_separator(ecp);
+ Location *location = palloc0_object(Location);
/* Get the length of the next path on ecp */
if (piece == NULL)
@@ -382,15 +401,21 @@ get_extension_control_directories(void)
* suffix if it is a custom extension control path.
*/
if (strcmp(piece, "$system") == 0)
+ {
+ location->macro = pstrdup(piece);
mangled = substitute_path_macro(piece,
"$system", system_dir);
+ }
else
+ {
+ location->macro = NULL;
mangled = psprintf("%s/extension", piece);
-
+ }
pfree(piece);
/* Canonicalize the path based on the OS and add to the
list */
canonicalize_path(mangled);
- paths = lappend(paths, mangled);
+ location->loc = mangled;
+ paths = lappend(paths, location);
/* Break if ecp is empty or move to the next path on
ecp */
if (ecp[len] == '\0')
@@ -2215,9 +2240,9 @@ pg_available_extensions(PG_FUNCTION_ARGS)
locations = get_extension_control_directories();
- foreach_ptr(char, location, locations)
+ foreach_ptr(Location, location, locations)
{
- dir = AllocateDir(location);
+ dir = AllocateDir(location->loc);
/*
* If the control directory doesn't exist, we want to silently
return
@@ -2229,13 +2254,13 @@ pg_available_extensions(PG_FUNCTION_ARGS)
}
else
{
- while ((de = ReadDir(dir, location)) != NULL)
+ while ((de = ReadDir(dir, location->loc)) != NULL)
{
ExtensionControlFile *control;
char *extname;
String *extname_str;
- Datum values[3];
- bool nulls[3];
+ Datum values[4];
+ bool nulls[4];
if (!is_extension_control_filename(de->d_name))
continue;
@@ -2259,7 +2284,7 @@ pg_available_extensions(PG_FUNCTION_ARGS)
found_ext = lappend(found_ext,
extname_str);
control = new_ExtensionControlFile(extname);
- control->control_dir = pstrdup(location);
+ control->control_dir = pstrdup(location->loc);
parse_extension_control_file(control, NULL);
memset(values, 0, sizeof(values));
@@ -2279,6 +2304,12 @@ pg_available_extensions(PG_FUNCTION_ARGS)
else
values[2] =
CStringGetTextDatum(control->comment);
+ /* location */
+ if (location->macro == NULL)
+ values[3] =
CStringGetTextDatum(location->loc);
+ else
+ values[3] =
CStringGetTextDatum(location->macro);
+
tuplestore_putvalues(rsinfo->setResult,
rsinfo->setDesc,
values, nulls);
}
@@ -2313,9 +2344,9 @@ pg_available_extension_versions(PG_FUNCTION_ARGS)
locations = get_extension_control_directories();
- foreach_ptr(char, location, locations)
+ foreach_ptr(Location, location, locations)
{
- dir = AllocateDir(location);
+ dir = AllocateDir(location->loc);
/*
* If the control directory doesn't exist, we want to silently
return
@@ -2327,7 +2358,7 @@ pg_available_extension_versions(PG_FUNCTION_ARGS)
}
else
{
- while ((de = ReadDir(dir, location)) != NULL)
+ while ((de = ReadDir(dir, location->loc)) != NULL)
{
ExtensionControlFile *control;
char *extname;
@@ -2356,12 +2387,13 @@ pg_available_extension_versions(PG_FUNCTION_ARGS)
/* read the control file */
control = new_ExtensionControlFile(extname);
- control->control_dir = pstrdup(location);
+ control->control_dir = pstrdup(location->loc);
parse_extension_control_file(control, NULL);
/* scan extension's script directory for
install scripts */
get_available_versions_for_extension(control,
rsinfo->setResult,
-
rsinfo->setDesc);
+
rsinfo->setDesc,
+
location);
}
FreeDir(dir);
@@ -2378,7 +2410,8 @@ pg_available_extension_versions(PG_FUNCTION_ARGS)
static void
get_available_versions_for_extension(ExtensionControlFile *pcontrol,
Tuplestorestate *tupstore,
-
TupleDesc tupdesc)
+
TupleDesc tupdesc,
+
Location *location)
{
List *evi_list;
ListCell *lc;
@@ -2391,8 +2424,8 @@ get_available_versions_for_extension(ExtensionControlFile
*pcontrol,
{
ExtensionVersionInfo *evi = (ExtensionVersionInfo *) lfirst(lc);
ExtensionControlFile *control;
- Datum values[8];
- bool nulls[8];
+ Datum values[9];
+ bool nulls[9];
ListCell *lc2;
if (!evi->installable)
@@ -2434,6 +2467,12 @@
get_available_versions_for_extension(ExtensionControlFile *pcontrol,
else
values[7] = CStringGetTextDatum(control->comment);
+ /* location */
+ if (location->macro == NULL)
+ values[8] = CStringGetTextDatum(location->loc);
+ else
+ values[8] = CStringGetTextDatum(location->macro);
+
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
/*
@@ -2475,6 +2514,8 @@ get_available_versions_for_extension(ExtensionControlFile
*pcontrol,
}
/* comment stays the same */
+ /* location stays the same */
+
tuplestore_putvalues(tupstore, tupdesc, values,
nulls);
}
}
@@ -3903,7 +3944,8 @@ find_in_paths(const char *basename, List *paths)
foreach(cell, paths)
{
- char *path = lfirst(cell);
+ Location *location = lfirst(cell);
+ char *path = location->loc;
char *full;
Assert(path != NULL);
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 03e82d28c87..4c2d16a4f6c 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -10735,16 +10735,16 @@
{ oid => '3082', descr => 'list available extensions',
proname => 'pg_available_extensions', procost => '10', prorows => '100',
proretset => 't', provolatile => 's', prorettype => 'record',
- proargtypes => '', proallargtypes => '{name,text,text}',
- proargmodes => '{o,o,o}', proargnames => '{name,default_version,comment}',
+ proargtypes => '', proallargtypes => '{name,text,text,text}',
+ proargmodes => '{o,o,o,o}', proargnames =>
'{name,default_version,comment,location}',
prosrc => 'pg_available_extensions' },
{ oid => '3083', descr => 'list available extension versions',
proname => 'pg_available_extension_versions', procost => '10',
prorows => '100', proretset => 't', provolatile => 's',
prorettype => 'record', proargtypes => '',
- proallargtypes => '{name,text,bool,bool,bool,name,_name,text}',
- proargmodes => '{o,o,o,o,o,o,o,o}',
- proargnames =>
'{name,version,superuser,trusted,relocatable,schema,requires,comment}',
+ proallargtypes => '{name,text,bool,bool,bool,name,_name,text,text}',
+ proargmodes => '{o,o,o,o,o,o,o,o,o}',
+ proargnames =>
'{name,version,superuser,trusted,relocatable,schema,requires,comment,location}',
prosrc => 'pg_available_extension_versions' },
{ oid => '3084', descr => 'list an extension\'s version update paths',
proname => 'pg_extension_update_paths', procost => '10', prorows => '100',
diff --git a/src/test/modules/test_extensions/t/001_extension_control_path.pl
b/src/test/modules/test_extensions/t/001_extension_control_path.pl
index 7fbe5bde332..332c74d72bc 100644
--- a/src/test/modules/test_extensions/t/001_extension_control_path.pl
+++ b/src/test/modules/test_extensions/t/001_extension_control_path.pl
@@ -25,6 +25,10 @@ my $ext_name2 = "test_custom_ext_paths_using_directory";
mkpath("$ext_dir/$ext_name2");
create_extension($ext_name2, $ext_dir, $ext_name2);
+# Make windows path use Unix slashes as canonicalize_path() is called when
+# collecting extension control paths. See get_extension_control_directories().
+my $ext_dir_canonicalized = $windows_os ? ($ext_dir =~ s/\\/\//gr) : $ext_dir;
+
# Use the correct separator and escape \ when running on Windows.
my $sep = $windows_os ? ";" : ":";
$node->append_conf(
@@ -43,29 +47,30 @@ is($ecp, "\$system$sep$ext_dir$sep$ext_dir2",
$node->safe_psql('postgres', "CREATE EXTENSION $ext_name");
$node->safe_psql('postgres', "CREATE EXTENSION $ext_name2");
+
my $ret = $node->safe_psql('postgres',
"select * from pg_available_extensions where name = '$ext_name'");
is( $ret,
- "test_custom_ext_paths|1.0|1.0|Test extension_control_path",
+ "test_custom_ext_paths|1.0|1.0|Test
extension_control_path|$ext_dir_canonicalized/extension",
"extension is installed correctly on pg_available_extensions");
$ret = $node->safe_psql('postgres',
"select * from pg_available_extension_versions where name =
'$ext_name'");
is( $ret,
- "test_custom_ext_paths|1.0|t|t|f|t|||Test extension_control_path",
+ "test_custom_ext_paths|1.0|t|t|f|t|||Test
extension_control_path|$ext_dir_canonicalized/extension",
"extension is installed correctly on pg_available_extension_versions");
$ret = $node->safe_psql('postgres',
"select * from pg_available_extensions where name = '$ext_name2'");
is( $ret,
- "test_custom_ext_paths_using_directory|1.0|1.0|Test
extension_control_path",
+ "test_custom_ext_paths_using_directory|1.0|1.0|Test
extension_control_path|$ext_dir_canonicalized/extension",
"extension is installed correctly on pg_available_extensions");
$ret = $node->safe_psql('postgres',
"select * from pg_available_extension_versions where name =
'$ext_name2'"
);
is( $ret,
- "test_custom_ext_paths_using_directory|1.0|t|t|f|t|||Test
extension_control_path",
+ "test_custom_ext_paths_using_directory|1.0|t|t|f|t|||Test
extension_control_path|$ext_dir_canonicalized/extension",
"extension is installed correctly on pg_available_extension_versions");
# Ensure that extensions installed on $system is still visible when using with
diff --git a/src/test/regress/expected/rules.out
b/src/test/regress/expected/rules.out
index 35e8aad7701..c876d2af0b8 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1310,14 +1310,16 @@ pg_available_extension_versions| SELECT e.name,
e.relocatable,
e.schema,
e.requires,
- e.comment
- FROM (pg_available_extension_versions() e(name, version, superuser,
trusted, relocatable, schema, requires, comment)
+ e.comment,
+ e.location
+ FROM (pg_available_extension_versions() e(name, version, superuser,
trusted, relocatable, schema, requires, comment, location)
LEFT JOIN pg_extension x ON (((e.name = x.extname) AND (e.version =
x.extversion))));
pg_available_extensions| SELECT e.name,
e.default_version,
x.extversion AS installed_version,
- e.comment
- FROM (pg_available_extensions() e(name, default_version, comment)
+ e.comment,
+ e.location
+ FROM (pg_available_extensions() e(name, default_version, comment, location)
LEFT JOIN pg_extension x ON ((e.name = x.extname)));
pg_backend_memory_contexts| SELECT name,
ident,
--
2.39.5 (Apple Git-154)
