View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0009477 | ardour | bugs | public | 2023-10-10 18:14 | 2023-10-14 13:06 |
| Reporter | cyr123 | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | new | Resolution | open | ||
| Platform | PC | OS | Pop!_OS | OS Version | 22.04 |
| Product Version | 8.0 | ||||
| Summary | 0009477: Unable to open native file dialogs from VST plugins | ||||
| Description | When I select an option in a plugin GUI that is supposed to open a file / directory dialog in the OS (e.g. "load preset", "open preset directory" or "load license file") nothing happens. This is specific to Ardour, it works as expected in Carla. I've seen this in a number of plugins, I expect it applies to all VST3 plugins at least. Examples: Dexed, TAL-U-NO-LX, AudioThings "Things" plugins. | ||||
| Steps To Reproduce | 1) Open custom GUI in Dexed 2) Click on CART 3) Click on LOAD, SAVE or SHOW DIR Nothing happens (a file dialog is expected) | ||||
| Additional Information | Just as I was posting this bug report I decided to run Ardour from a terminal and look for any hints, and I found some. It looks like some kind of confusion regarding MIME types, followed to an attempt to run every web browser under the sun. I hope this makes sense to someone... xdg-mime: mimetype argument missing Try 'xdg-mime --help' for more information. Warning: unknown mime-type for "/home/cyrano/.local/share/DigitalSuburban/Dexed/Cartridges" -- using "application/octet-stream" Error: no "view" mailcap rules found for type "application/octet-stream" Use of uninitialized value $file in open at /usr/share/perl5/File/MimeInfo/Applications.pm line 140. Use of uninitialized value $file in open at /usr/share/perl5/File/MimeInfo/Applications.pm line 140. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Use of uninitialized value in subroutine entry at /usr/share/perl5/File/BaseDir.pm line 105. Opening "/home/cyrano/.local/share/DigitalSuburban/Dexed/Cartridges" with Visual Studio Code (inode/directory) /usr/bin/flatpak: symbol lookup error: /lib/x86_64-linux-gnu/libsoup-2.4.so.1: undefined symbol: g_file_info_get_modification_date_time /usr/bin/xdg-open: 882: x-www-browser: not found XPCOMGlueLoad error for file /usr/lib/firefox/libmozgtk.so: /lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0: undefined symbol: atk_component_scroll_to Couldn't load XPCOM. /usr/bin/xdg-open: 882: iceweasel: not found /usr/bin/xdg-open: 882: seamonkey: not found /usr/bin/xdg-open: 882: mozilla: not found /usr/bin/xdg-open: 882: epiphany: not found /usr/bin/xdg-open: 882: konqueror: not found /usr/bin/xdg-open: 882: chromium: not found /usr/bin/xdg-open: 882: chromium-browser: not found /usr/bin/xdg-open: 882: google-chrome: not found /usr/bin/xdg-open: 882: www-browser: not found /usr/bin/xdg-open: 882: links2: not found /usr/bin/xdg-open: 882: elinks: not found /usr/bin/xdg-open: 882: links: not found /usr/bin/xdg-open: 882: lynx: not found /usr/bin/xdg-open: 882: w3m: not found xdg-open: no method available for opening '/home/cyrano/.local/share/DigitalSuburban/Dexed/Cartridges' /bin/sh: 1: /etc/alternatives/x-www-browser: not found XPCOMGlueLoad error for file /usr/lib/firefox/libmozgtk.so: /lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0: undefined symbol: atk_component_scroll_to Couldn't load XPCOM. /bin/sh: 1: mozilla: not found /bin/sh: 1: google-chrome: not found /bin/sh: 1: chromium-browser: not found /bin/sh: 1: opera: not found /bin/sh: 1: konqueror: not found | ||||
| Tags | No tags attached. | ||||
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I have tried to debug this further, looking more closely at the log I see that xdg-open tries (but fails) to launch VS Code, which might be related to this issue: https://github.com/microsoft/vscode/issues/41037 (though I have had no such problems outside Ardour) If I uninstall VS Code, xdg-open now correctly tries to open the file manager (Nautilus), but that then fails because of: "/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0: undefined symbol: atk_component_scroll_to" Something quite similar reported here: https://gitlab.gnome.org/GNOME/zenity/-/issues/18 turned out to be caused by LD_LIBRARY_PATH and conflicting library versions, I strongly suspect this is the issue here as well. I see that the launch script for Ardour sets LD_LIBRARY_PATH to that Ardour can use the bundled libraries, but shouldn't this be cleared from the environment when an external application is launched from within Ardour? |
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I think I confirmed and partially fixed the issue using the following wrapper script: $ cat /opt/Ardour-8.0.0/bin/xdg-open #!/bin/sh unset LD_LIBRARY_PATH /usr/bin/xdg-open "$@" This fixed the "show directory" function, however it is still no possible to open a file dialog to load or save a file (and I see no log output to diagnose this). |
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If they'd use the official VST3 GUI that would not be an issue. LD_LIBRARY_PATH is unset there: https://github.com/steinbergmedia/vstgui/blame/65c353fcad783dd6baa34a2b9dbe23bb9f88d035/vstgui/lib/platform/linux/x11fileselector.cpp#L189 Please suggest that to the plugin vendor |
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Do you happen to know any plugins that do this correctly I could check? Is there any reason Ardour couldn't, or shouldn't, unset LD_LIBRARY_PATH before loading any plugins? Or could the way it's built and packaged be changed to not rely on this var? Meanwhile, I've installed a flatpak version of Ardour8 and it doesn't have this issue. I suppose that's a solution, but I'd rather use the officially supported version. |
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Ardour cannot unset it. It is the plugin that copies the environment after calling fork (which is another thing a plugin should not do since it causes dropouts). surge is an example of a plugin that gets it right (and they also use vfork). |
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What I mean was essentially https://linux.die.net/man/3/unsetenv in main() But maybe that would break bundled plugins or some other dynamically loaded part of Ardour ? SurgeXT (LV2 and VST3 version) seems to have the same problem as the other plugins I've tried. I've fixed the problem using the brute force method of removing every .so file from /opt/Ardour-8.0.0/lib that isn't needed to allow Ardour to launch without errors. This is what I'm going to use for now, the flatpak has the problem of not seeing plugins installed using OS packages because of the sandboxing. |
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> What I mean was essentially https://linux.die.net/man/3/unsetenv in main() That will not work since Ardour dynamically loads modules after that. All engine backends are dynamically linked, as are control surfaces and panners. > SurgeXT (LV2 and VST3 version) seems to have the same problem as the other plugins I've tried. Surge solved this a few years ago: https://github.com/surge-synthesizer/surge/issues/3790 https://github.com/surge-synthesizer/surge/issues/657 Anyway it is really bad practice for plugins to rely on external resources. (libraries or applications), and as the surge discussion explains using fork to launch an external app is even worse since it can cause dropouts. On other platforms (macOS, Windows) plugins are all statically linked, and pro-audio distros (e.g. KXStudio) do this as well. I'd rather prefer a baldly written or badly packaged plugin to not work than causing audio dropouts. YMMV. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2023-10-10 18:14 | cyr123 | New Issue | |
| 2023-10-11 15:27 | cyr123 | Note Added: 0028181 | |
| 2023-10-11 16:05 | cyr123 | Note Added: 0028182 | |
| 2023-10-13 00:35 | x42 | Note Added: 0028193 | |
| 2023-10-13 05:25 | cyr123 | Note Added: 0028194 | |
| 2023-10-13 20:00 | x42 | Note Added: 0028196 | |
| 2023-10-14 07:22 | cyr123 | Note Added: 0028197 | |
| 2023-10-14 13:06 | x42 | Note Added: 0028198 | |
| 2023-10-14 13:06 | x42 | Note Edited: 0028198 | |
| 2023-10-14 13:06 | x42 | Note Edited: 0028198 |
