Libdecor 'no decoration' fallback doesn't work when no libdecor plugins are installed

[hjbar]

I’m on Debian and I use Sway as window manager. When I try to mirror my laptop screen, the following error is raised:

Couldn't open plugin directory: No such file or directory
No plugins found, falling back on no decorations
error: wayland::init(): surface not configured

Here is the output from the command wl-mirror -v eDP-1:

debug: main::main(): initializing stream
debug: main::main(): initializing wayland
debug: wayland::on_registry_add(): wl_shm (version = 2, id = 1)
debug: wayland::on_registry_add(): zwp_linux_dmabuf_v1 (version = 4, id = 2)
debug: wayland::on_registry_add(): wp_linux_drm_syncobj_manager_v1 (version = 1, id = 3)
debug: wayland::on_registry_add(): wl_compositor (version = 6, id = 4)
debug: wayland::on_registry_add(): wl_subcompositor (version = 1, id = 5)
debug: wayland::on_registry_add(): wl_data_device_manager (version = 3, id = 6)
debug: wayland::on_registry_add(): zwlr_gamma_control_manager_v1 (version = 1, id = 7)
debug: wayland::on_registry_add(): zxdg_output_manager_v1 (version = 3, id = 8)
debug: wayland::on_registry_add(): ext_idle_notifier_v1 (version = 2, id = 9)
debug: wayland::on_registry_add(): zwp_idle_inhibit_manager_v1 (version = 1, id = 10)
debug: wayland::on_registry_add(): zwlr_layer_shell_v1 (version = 4, id = 11)
debug: wayland::on_registry_add(): xdg_wm_base (version = 5, id = 12)
debug: wayland::on_registry_add(): zwp_tablet_manager_v2 (version = 1, id = 13)
debug: wayland::on_registry_add(): org_kde_kwin_server_decoration_manager (version = 1, id = 14)
debug: wayland::on_registry_add(): zxdg_decoration_manager_v1 (version = 1, id = 15)
debug: wayland::on_registry_add(): zwp_relative_pointer_manager_v1 (version = 1, id = 16)
debug: wayland::on_registry_add(): zwp_pointer_constraints_v1 (version = 1, id = 17)
debug: wayland::on_registry_add(): wp_presentation (version = 2, id = 18)
debug: wayland::on_registry_add(): wp_alpha_modifier_v1 (version = 1, id = 19)
debug: wayland::on_registry_add(): zwlr_output_manager_v1 (version = 4, id = 20)
debug: wayland::on_registry_add(): zwlr_output_power_manager_v1 (version = 1, id = 21)
debug: wayland::on_registry_add(): zwp_input_method_manager_v2 (version = 1, id = 22)
debug: wayland::on_registry_add(): zwp_text_input_manager_v3 (version = 1, id = 23)
debug: wayland::on_registry_add(): ext_foreign_toplevel_list_v1 (version = 1, id = 24)
debug: wayland::on_registry_add(): zwlr_foreign_toplevel_manager_v1 (version = 3, id = 25)
debug: wayland::on_registry_add(): ext_session_lock_manager_v1 (version = 1, id = 26)
debug: wayland::on_registry_add(): wp_drm_lease_device_v1 (version = 1, id = 27)
debug: wayland::on_registry_add(): zwlr_export_dmabuf_manager_v1 (version = 1, id = 28)
debug: wayland::on_registry_add(): zwlr_screencopy_manager_v1 (version = 3, id = 29)
debug: wayland::on_registry_add(): ext_image_copy_capture_manager_v1 (version = 1, id = 30)
debug: wayland::on_registry_add(): ext_output_image_capture_source_manager_v1 (version = 1, id = 31)
debug: wayland::on_registry_add(): zwlr_data_control_manager_v1 (version = 2, id = 32)
debug: wayland::on_registry_add(): ext_data_control_manager_v1 (version = 1, id = 33)
debug: wayland::on_registry_add(): wp_security_context_manager_v1 (version = 1, id = 34)
debug: wayland::on_registry_add(): wp_viewporter (version = 1, id = 35)
debug: wayland::on_registry_add(): wp_single_pixel_buffer_manager_v1 (version = 1, id = 36)
debug: wayland::on_registry_add(): wp_content_type_manager_v1 (version = 1, id = 37)
debug: wayland::on_registry_add(): wp_fractional_scale_manager_v1 (version = 1, id = 38)
debug: wayland::on_registry_add(): wp_tearing_control_manager_v1 (version = 1, id = 39)
debug: wayland::on_registry_add(): zxdg_exporter_v1 (version = 1, id = 40)
debug: wayland::on_registry_add(): zxdg_importer_v1 (version = 1, id = 41)
debug: wayland::on_registry_add(): zxdg_exporter_v2 (version = 1, id = 42)
debug: wayland::on_registry_add(): zxdg_importer_v2 (version = 1, id = 43)
debug: wayland::on_registry_add(): xdg_activation_v1 (version = 1, id = 44)
debug: wayland::on_registry_add(): wp_cursor_shape_manager_v1 (version = 1, id = 45)
debug: wayland::on_registry_add(): zwp_virtual_keyboard_manager_v1 (version = 1, id = 46)
debug: wayland::on_registry_add(): zwlr_virtual_pointer_manager_v1 (version = 2, id = 47)
debug: wayland::on_registry_add(): zwp_keyboard_shortcuts_inhibit_manager_v1 (version = 1, id = 48)
debug: wayland::on_registry_add(): zwp_pointer_gestures_v1 (version = 3, id = 49)
debug: wayland::on_registry_add(): ext_transient_seat_manager_v1 (version = 1, id = 50)
debug: wayland::on_registry_add(): wl_seat (version = 9, id = 51)
debug: wayland::on_registry_add(): zwp_primary_selection_device_manager_v1 (version = 1, id = 53)
debug: wayland::on_registry_add(): wl_output (version = 4, id = 54)
Couldn't open plugin directory: No such file or directory
No plugins found, falling back on no decorations
debug: wayland::on_xdg_output_name(): updating output eDP-1 (id = 54)
debug: wayland::on_xdg_output_logical_size(): updating output eDP-1 (size = 1920x1080, id = 54)
error: wayland::init(): surface not configured
debug: main::cleanup(): deallocating resources
debug: wayland::cleanup(): destroying wayland objects
debug: wayland::shm::cleanup(): destroying wayland shm objects

Here is the output from the command strace wl-mirror eDP-1:

execve("/usr/bin/wl-mirror", ["wl-mirror", "eDP-1"], 0x7fff7e0e8b48 /* 88 vars */) = 0
brk(NULL)                               = 0x56018a8df000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f442ce19000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (Aucun fichier ou dossier de ce nom)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=116422, ...}) = 0
mmap(NULL, 116422, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f442cdfc000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libwayland-egl.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=14192, ...}) = 0
mmap(NULL, 16416, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cdf7000
mmap(0x7f442cdf8000, 4096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7f442cdf8000
mmap(0x7f442cdf9000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f442cdf9000
mmap(0x7f442cdfa000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f442cdfa000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libEGL.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=88008, ...}) = 0
mmap(NULL, 87328, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cde1000
mmap(0x7f442cde4000, 49152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f442cde4000
mmap(0x7f442cdf0000, 20480, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f442cdf0000
mmap(0x7f442cdf5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7f442cdf5000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libGLESv2.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=71672, ...}) = 0
mmap(NULL, 69664, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cdcf000
mmap(0x7f442cdd7000, 20480, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8000) = 0x7f442cdd7000
mmap(0x7f442cddc000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7f442cddc000
mmap(0x7f442cdde000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f442cdde000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libdecor-0.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=43360, ...}) = 0
mmap(NULL, 41416, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cdc4000
mmap(0x7f442cdc8000, 12288, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f442cdc8000
mmap(0x7f442cdcb000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f442cdcb000
mmap(0x7f442cdcd000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x9000) = 0x7f442cdcd000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libgbm.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=18736, ...}) = 0
mmap(NULL, 20736, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cdbe000
mmap(0x7f442cdc0000, 4096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f442cdc0000
mmap(0x7f442cdc1000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f442cdc1000
mmap(0x7f442cdc2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f442cdc2000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libdrm.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=92888, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f442cdbc000
mmap(NULL, 93424, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cda5000
mmap(0x7f442cdaa000, 49152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5000) = 0x7f442cdaa000
mmap(0x7f442cdb6000, 16384, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f442cdb6000
mmap(0x7f442cdba000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15000) = 0x7f442cdba000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libwayland-client.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=77200, ...}) = 0
mmap(NULL, 75184, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cd92000
mmap(0x7f442cd98000, 28672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f442cd98000
mmap(0x7f442cd9f000, 12288, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7f442cd9f000
mmap(0x7f442cda2000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x7f442cda2000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=1067296, ...}) = 0
mmap(NULL, 1069080, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cc8c000
mmap(0x7f442cc9d000, 536576, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f442cc9d000
mmap(0x7f442cd20000, 458752, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x94000) = 0x7f442cd20000
mmap(0x7f442cd90000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x103000) = 0x7f442cd90000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\241\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 896, 64) = 896
fstat(3, {st_mode=S_IFREG|0755, st_size=2190672, ...}) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 896, 64) = 896
mmap(NULL, 2235984, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442ca00000
mmap(0x7f442ca28000, 1474560, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7f442ca28000
mmap(0x7f442cb90000, 520192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x190000) = 0x7f442cb90000
mmap(0x7f442cc0f000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x20e000) = 0x7f442cc0f000
mmap(0x7f442cc15000, 52816, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f442cc15000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libGLdispatch.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=723008, ...}) = 0
mmap(NULL, 754368, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442c947000
mmap(0x7f442c988000, 258048, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x41000) = 0x7f442c988000
mmap(0x7f442c9c7000, 81920, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x80000) = 0x7f442c9c7000
mmap(0x7f442c9db000, 118784, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x94000) = 0x7f442c9db000
mmap(0x7f442c9f8000, 29376, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f442c9f8000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libexpat.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=182368, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f442cc8a000
mmap(NULL, 180352, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cc5d000
mmap(0x7f442cc61000, 122880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f442cc61000
mmap(0x7f442cc7f000, 32768, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7f442cc7f000
mmap(0x7f442cc87000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2a000) = 0x7f442cc87000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libffi.so.8", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=59912, ...}) = 0
mmap(NULL, 63296, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f442cc4d000
mmap(0x7f442cc4f000, 40960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f442cc4f000
mmap(0x7f442cc59000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc000) = 0x7f442cc59000
mmap(0x7f442cc5b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7f442cc5b000
close(3)                                = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f442cc4b000
arch_prctl(ARCH_SET_FS, 0x7f442cc4bb80) = 0
set_tid_address(0x7f442cc4be50)         = 5077
set_robust_list(0x7f442cc4be60, 24)     = 0
rseq(0x7f442cc4bac0, 0x20, 0, 0x53053053) = 0
mprotect(0x7f442cc0f000, 16384, PROT_READ) = 0
mprotect(0x7f442cc5b000, 4096, PROT_READ) = 0
mprotect(0x7f442cc87000, 8192, PROT_READ) = 0
mprotect(0x7f442c9db000, 114688, PROT_READ) = 0
mprotect(0x7f442cd90000, 4096, PROT_READ) = 0
mprotect(0x7f442cda2000, 8192, PROT_READ) = 0
mprotect(0x7f442cdba000, 4096, PROT_READ) = 0
mprotect(0x7f442cdc2000, 4096, PROT_READ) = 0
mprotect(0x7f442cdcd000, 4096, PROT_READ) = 0
mprotect(0x7f442cdde000, 8192, PROT_READ) = 0
mprotect(0x7f442cdf5000, 4096, PROT_READ) = 0
mprotect(0x7f442cdfa000, 4096, PROT_READ) = 0
mprotect(0x560186fc7000, 12288, PROT_READ) = 0
mprotect(0x7f442ce5b000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
getrandom("\xe8\x46\xbc\x29\xaa\x5f\x19\x8e", 8, GRND_NONBLOCK) = 8
munmap(0x7f442cdfc000, 116422)          = 0
brk(NULL)                               = 0x56018a8df000
brk(0x56018a900000)                     = 0x56018a900000
epoll_create(1)                         = 3
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0) = 4
connect(4, {sa_family=AF_UNIX, sun_path="/run/user/1000/wayland-1"}, 27) = 0
epoll_ctl(3, EPOLL_CTL_ADD, 4, {events=EPOLLIN, data=0x7fff9e34d3e8}) = 0
sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\0\0\0\1\0\f\0\2\0\0\0\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 24
ppoll([{fd=4, events=POLLIN}], 1, NULL, NULL, 8) = 1 ([{fd=4, revents=POLLIN}])
recvmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\2\0\0\0\0\0\34\0\1\0\0\0\7\0\0\0wl_shm\0\0\2\0\0\0\2\0\0\0"..., iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 2496
recvmsg(4, {msg_namelen=0}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Ressource temporairement non disponible)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libdecor/plugins-1", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (Aucun fichier ou dossier de ce nom)
write(2, "Couldn't open plugin directory: "..., 58Couldn't open plugin directory: No such file or directory
) = 58
write(2, "No plugins found, falling back o"..., 49No plugins found, falling back on no decorations
) = 49
sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\2\0\0\0\0\0 \0\1\0\0\0\7\0\0\0wl_shm\0\0\1\0\0\0\4\0\0\0"..., iov_len=684}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 684
sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\3\0\0\0\6\0\10\0\1\0\0\0\0\0\f\0\26\0\0\0", iov_len=20}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 20
ppoll([{fd=4, events=POLLIN}], 1, NULL, NULL, 8) = 1 ([{fd=4, revents=POLLIN}])
recvmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\4\0\0\0\0\0\f\0\0\0\0\0\4\0\0\0\0\0\f\0\1\0\0\0\4\0\0\0\0\0\f\0"..., iov_len=1600}, {iov_base="\33\0\0\0\27\0\0\0wp_drm_lease_device_v1\0\0"..., iov_len=2496}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 2932
recvmsg(4, {msg_namelen=0}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Ressource temporairement non disponible)
write(2, "error: wayland::init(): surface "..., 47error: wayland::init(): surface not configured
) = 47
epoll_ctl(3, EPOLL_CTL_DEL, 4, NULL)    = 0
close(4)                                = 0
close(3)                                = 0
getpid()                                = 5077
exit_group(1)                           = ?
+++ exited with 1 +++

Do you know how we can fix this error?

[Ferdi265]

This is a bug related to libdecor, which is used for client-side window decorations on desktops that don't provide any server-side decorations.

Normally, libdecor should not provide decorations on sway and should stay out of the way, and even if it falls back to no decorations, it should normally work fine, so I'm unsure why it's not correctly falling back.

Which Debian release are you on and which packages related to wl-mirror and libdecor do you have installed? (see e.g. apt list --installed)

[Ferdi265]

Apparently debian now has separate packages for libdecor plugins. Can you try installing libdecor-0-plugin-1-gtk?

I think I'll need to add at least the gtk plugin to recommended dependencies for the wl-mirror debian package, and figure out why fallback isn't working.

[Ferdi265]

Marking as upstream bug, since the issue is triggeded by libdecor packaging in Debian, and I'll improve the debian packaging for wl-mirror for the next release.

I'll also try and find if the fallback not working is a misuse of the library by wl-mirror, or if this is just broken in upstream libdecor.

[hjbar]

I installed the libdecor-0-plugin-1-gtk package and everything is working again. Thank you for your help!

[Ferdi265]

Good to see it's working for you again.

I renamed the issue to point to the underlying issue with decoration fallback, since this shouldn't happen even if no plugins are installed, and leave this open until the underlying issue is fixed.

[Ferdi265]

Fixed; apparently libdecor needs an additional wayland roundtrip if no plugins are found, and wl-mirror only waited for a single roundtrip.

I'll release v0.18.4 soon, which will work even without libdecor plugins installed.