Hello everyone. For some reason, the systemd unit of my microphone keeps changing, so I can't make a systemd service depending on a specific unit. I'm trying to make a shell script that gets the systemd unit of my microphone and adds that to a particular systemd service. To paint the picture:
systemctl list-units --type=device | grep RODE_NT-USB
sys-devices-pci0000:00-0000:00:01.3-0000:02:00.0-usb1-1\x2d2-1\x2d2:1.0-sound-card3-controlC3.device loaded active plugged RODE_NT-USB
I then need to take this first part, sys-device-...-controlC3.device, and add it to the systemd service.
The part after Requires= and After= should be replaced with this new string.
[Unit]
Description=Noisetorch Noise Cancelling
Requires=sys-devices-pci0000:00-0000:00:01.3-0000:02:00.0-usb1-1\x2d2-1\x2d2:1.0-sound-card1-controlC1.device
After=sys-devices-pci0000:00-0000:00:01.3-0000:02:00.0-usb1-1\x2d2-1\x2d2:1.0-sound-card1-controlC1.device
# Depending on if you're using pulseaudio or pipewire, uncomment the correct line
# After=pulseaudio.service
After=pipewire.service
[Service]
Type=simple
RemainAfterExit=yes
ExecStartPre=/bin/sleep 10
ExecStart=/usr/bin/noisetorch -i -s alsa_input.usb-RODE_Microphones_RODE_NT-USB-00.analog-stereo
ExecStop=/usr/bin/noisetorch -u
[Install]
WantedBy=default.target
My bash-fu isn't quite up to par, so I think this would be a nice place to start 
garuda-inxi just in case
System:
Kernel: 5.18.8-zen1-1-zen arch: x86_64 bits: 64 compiler: gcc v: 12.1.0
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-zen
root=UUID=1e990d50-f7c1-4ded-a883-784141da6847 rw rootflags=subvol=@
rd.udev.log_priority=3 vt.global_cursor_default=0
systemd.unified_cgroup_hierarchy=1 loglevel=3 quiet radeon.dpm=0
Desktop: KDE Plasma v: 5.25.2 tk: Qt v: 5.15.5 wm: kwin_wayland vt: 2
dm: SDDM Distro: Garuda Linux base: Arch Linux
Machine:
Type: Desktop Mobo: ASUSTeK model: PRIME B350-PLUS v: Rev X.0x
serial: <superuser required> UEFI: American Megatrends v: 3401
date: 12/04/2017
CPU:
Info: model: AMD Ryzen 5 1600 bits: 64 type: MT MCP arch: Zen
built: 2017-19 process: GF 14nm family: 0x17 (23) model-id: 1 stepping: 1
microcode: 0x8001129
Topology: cpus: 1x cores: 6 tpc: 2 threads: 12 smt: enabled cache:
L1: 576 KiB desc: d-6x32 KiB; i-6x64 KiB L2: 3 MiB desc: 6x512 KiB
L3: 16 MiB desc: 2x8 MiB
Speed (MHz): avg: 3254 high: 3493 min/max: 1550/3500 boost: disabled
scaling: driver: acpi-cpufreq governor: performance cores: 1: 3493 2: 3493
3: 3493 4: 3493 5: 2986 6: 3480 7: 2948 8: 2873 9: 3019 10: 2796 11: 3493
12: 3492 bogomips: 83838
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Vulnerabilities:
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: mmio_stale_data status: Not affected
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl
Type: spectre_v1
mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Retpolines, STIBP: disabled, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: AMD Vega 10 XL/XT [Radeon RX 56/64] vendor: Sapphire
driver: amdgpu v: kernel arch: GCN 5 process: GF 14nm built: 2017-20 pcie:
gen: 3 speed: 8 GT/s lanes: 16 ports: active: DP-1,DP-2
empty: HDMI-A-1,HDMI-A-2 bus-ID: 0a:00.0 chip-ID: 1002:687f
class-ID: 0300
Display: wayland server: X.org v: 1.21.1.3 with: Xwayland v: 22.1.2
compositor: kwin_wayland driver: X: loaded: amdgpu unloaded: modesetting
alternate: fbdev,vesa gpu: amdgpu d-rect: 4480x1080 display-ID: 0
Monitor-1: DP-1 pos: right res: 2560x1080 size: N/A modes: N/A
Monitor-2: DP-2 pos: primary,left res: 1920x1080 size: N/A modes: N/A
OpenGL:
renderer: AMD Radeon RX Vega (vega10 LLVM 14.0.6 DRM 3.46 5.18.8-zen1-1-zen)
v: 4.6 Mesa 22.1.2 direct render: Yes
Audio:
Device-1: AMD Vega 10 HDMI Audio [Radeon 56/64] driver: snd_hda_intel
v: kernel bus-ID: 1-2:2 pcie: gen: 3 chip-ID: 19f7:0003 speed: 8 GT/s
class-ID: 0300 lanes: 16 bus-ID: 0a:00.1 chip-ID: 1002:aaf8
class-ID: 0403
Device-2: AMD Family 17h HD Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 0c:00.3
chip-ID: 1022:1457 class-ID: 0403
Device-3: RODE Microphones NT-USB type: USB
driver: hid-generic,snd-usb-audio,usbhid
Sound Server-1: ALSA v: k5.18.8-zen1-1-zen running: yes
Sound Server-2: PulseAudio v: 16.1 running: no
Sound Server-3: PipeWire v: 0.3.53 running: yes
Network:
Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
vendor: ASUSTeK PRIME B450M-A driver: r8169 v: kernel pcie: gen: 1
speed: 2.5 GT/s lanes: 1 port: f000 bus-ID: 04:00.0 chip-ID: 10ec:8168
class-ID: 0200
IF: enp4s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Bluetooth:
Device-1: ASUSTek Broadcom BCM20702A0 Bluetooth type: USB driver: btusb
v: 0.8 bus-ID: 1-3:3 chip-ID: 0b05:17cb class-ID: fe01 serial: <filter>
Report: bt-adapter ID: hci0 rfk-id: 0 state: down
bt-service: enabled,running rfk-block: hardware: no software: no
address: <filter>
Drives:
Local Storage: total: 2.61 TiB used: 1.94 TiB (74.2%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Samsung
model: SSD 970 EVO Plus 250GB size: 232.89 GiB block-size: physical: 512 B
logical: 512 B speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter>
rev: 2B2QEXM7 temp: 48.9 C scheme: GPT
ID-2: /dev/sda maj-min: 8:0 vendor: Samsung model: ST1500LM006 HN-M151RAD
size: 1.36 TiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s
type: HDD rpm: 5400 serial: <filter> rev: 0008 scheme: GPT
ID-3: /dev/sdb maj-min: 8:16 vendor: Crucial model: CT120BX100SSD1
size: 111.79 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
type: SSD serial: <filter> rev: MU01 scheme: GPT
ID-4: /dev/sdc maj-min: 8:32 vendor: Samsung model: SSD 860 QVO 1TB
size: 931.51 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
type: SSD serial: <filter> rev: 1B6Q scheme: GPT
Partition:
ID-1: / raw-size: 232.59 GiB size: 232.59 GiB (100.00%)
used: 166.51 GiB (71.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
used: 576 KiB (0.2%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1
ID-3: /home raw-size: 232.59 GiB size: 232.59 GiB (100.00%)
used: 166.51 GiB (71.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
ID-4: /var/log raw-size: 232.59 GiB size: 232.59 GiB (100.00%)
used: 166.51 GiB (71.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
ID-5: /var/tmp raw-size: 232.59 GiB size: 232.59 GiB (100.00%)
used: 166.51 GiB (71.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
Swap:
Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default)
ID-1: swap-1 type: zram size: 15.56 GiB used: 2 MiB (0.0%) priority: 100
dev: /dev/zram0
Sensors:
System Temperatures: cpu: N/A mobo: N/A gpu: amdgpu temp: 53.0 C
mem: 47.0 C
Fan Speeds (RPM): N/A gpu: amdgpu fan: 1219
Info:
Processes: 413 Uptime: 32m wakeups: 0 Memory: 15.56 GiB
used: 6.55 GiB (42.1%) Init: systemd v: 251 default: graphical
tool: systemctl Compilers: gcc: 12.1.0 clang: 14.0.6 Packages: 2281
pacman: 2248 lib: 525 flatpak: 33 Shell: fish v: 3.4.1 default: Bash
v: 5.1.16 running-in: kitty inxi: 3.3.19
e[1;34mGaruda (2.6.4-2):e[0m
e[1;34m System install date:e[0m 2021-12-14
e[1;34m Last full system update:e[0m 2022-07-03
e[1;34m Is partially upgraded: e[0m No
e[1;34m Relevant software: e[0m NetworkManager
e[1;34m Windows dual boot: e[0m No/Undetected
e[1;34m Snapshots: e[0m Snapper
e[1;34m Failed units: e[0m home-sylvester-RaspberryPi-disks-books.mount home-sylvester-RaspberryPi-disks-camera.mount home-sylvester-RaspberryPi-disks-home.mount home-sylvester-RaspberryPi-disks-shows.mount home-sylvester-RaspberryPi-disks-stash.mount
Don't mind the failed mounts, that's a separate issue I'm trying to fix.