pgadmin4: add option to enable desktop mode

By default, pgadmin4 uses SERVER_MODE = True. This requires
access to system directories (e.g. /var/lib/pgadmin). There is
no easy way to change this mode during runtime. One has to change
or add config files withing pgadmin's directory structure to change it
or add a system-wide config file under `/etc/pgadmin`[1].

This isn't always easy to achive or may not be possible at all. For
those usecases this implements a switch in the pgadmin4 derivation and
adds a new top-level package `pgadmin4-desktopmode`. This builds in
DESKTOP MODE and allows the usage of pgadmin4 without the nixOS module
and without access to system-wide directories.

pgadmin4 module saves the configuration to /etc/pgadmin/config_system.py
pgadmin4-desktopmode tries to read that as well. This normally fails with
a PermissionError, as the config file is owned by the user of the pgadmin module.

With the check-system-config-dir.patch this will just throw a warning
but will continue and not read the file.

If we run pgadmin4-desktopmode as root
(something one really shouldn't do), it can read the config file and fail,
because of the wrong config for desktopmode.

[1]https://www.pgadmin.org/docs/pgadmin4/latest/config_py.html

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

1 files changed, 17 insertions, 0 deletions

diff --git a/pkgs/tools/admin/pgadmin/check-system-config-dir.patch b/pkgs/tools/admin/pgadmin/check-system-config-dir.patch
new file mode 100644
index 0000000000000..f614bab64e6fd
--- /dev/null
+++ b/pkgs/tools/admin/pgadmin/check-system-config-dir.patch
@@ -0,0 +1,17 @@
+diff --git a/web/config.py b/web/config.py
+index 4774043..5b73fd3 100644
+--- a/web/config.py
++++ b/web/config.py
+@@ -884,6 +884,12 @@ if os.path.exists(system_config_dir + '/config_system.py'):
+         user_config_settings.update(config_system_settings)
+     except ImportError:
+         pass
++    except PermissionError:
++        print(f"Permission denied to open {str(system_config_dir + '/config_system.py')}. \n \
++              If you are running pgadmin4-desktopmode please make sure you disable  \n \
++              the pgadmin NixOS module first. If you rely on settings in \n \
++              {str(system_config_dir + '/config_system.py')}, please check the correct permissions.")
++        pass
+
+ # Update settings for 'LOG_FILE', 'SQLITE_PATH', 'SESSION_DB_PATH',
+ # 'AZURE_CREDENTIAL_CACHE_DIR', 'KERBEROS_CCACHE_DIR', 'STORAGE_DIR'
\ No newline at end of file