Could not determine ESPHome version

[schwarzenbergf]

First off all, thanks for this great stuff.
Unfortunately I experience a problem which I could not solve by myself.
The main problem is, that the add-on for some reason cannot determine the ESPHome version.
And furthermore it seems to be unable to get the current version of the devices.

It is getting for both always 'unknown'.

Then it compares 'unknown' against 'unknown', so nothing to do.
Do you have any idea what could go wrong in my setup.

Thanks,
Frank

PS.:

If I run in HA Terminal
docker exec addon_5c53de3b_esphome esphome version
I get: Version: 2025.10.4
In your code you are looking for 'ESPHome' instead of 'Version'.

Here is the log:

s6-rc: info: service s6rc-oneshot-runner: starting
s6-rc: info: service s6rc-oneshot-runner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service fix-attrs successfully started
s6-rc: info: service legacy-cont-init: starting
s6-rc: info: service legacy-cont-init successfully started
s6-rc: info: service legacy-services: starting
s6-rc: info: service legacy-services successfully started
[INFO] ======================================================================
[INFO] ESPHome Selective Updates - Starting
[INFO] ======================================================================
[INFO] Configuration:
[INFO] ESPHome container: addon_5c53de3b_esphome
[INFO] Dry run mode: true
[INFO]
[INFO] Checking Docker socket availability...
[INFO] ✓ Docker socket found: /run/docker.sock
[INFO]
[INFO] Verifying Docker CLI...
[INFO] ✓ Docker CLI available: Docker version 25.0.5, build d260a54c81efcc3f00fe67dee78c94b16c2f8692
[INFO]
[INFO] Testing Docker daemon connection...
[INFO] ✓ Docker daemon connection OK
[INFO]
[INFO] Verifying ESPHome container 'addon_5c53de3b_esphome'...
[INFO] ✓ ESPHome container found and accessible
[INFO]
[INFO] Detecting ESPHome version...
[INFO] ✓ ESPHome version: unknown
[INFO]
[INFO] ======================================================================
[INFO] Pre-flight Checks Complete
[INFO] ======================================================================
[INFO] ✓ Docker socket: /run/docker.sock
[INFO] ✓ Docker daemon: Connected
[INFO] ✓ ESPHome container: addon_5c53de3b_esphome
[INFO] ✓ ESPHome version: unknown
[INFO]
[INFO] Safety boundaries:
[INFO] • Will only access: addon_5c53de3b_esphome
[INFO] • Will only modify: /config/esphome/builds/
[INFO] • No access to: host system, other containers
[INFO]
[INFO] Starting Python updater script...
[INFO] ======================================================================
[INFO]
[2025-11-04 10:55:41] ===============================================================================
[2025-11-04 10:55:41] Safety Verification
[2025-11-04 10:55:41] ===============================================================================
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] --- Safety Check: Docker Socket ---
[2025-11-04 10:55:41] ✓ Docker socket found: /run/docker.sock
[2025-11-04 10:55:41] ✓ Docker CLI available: Docker version 25.0.5, build d260a54c81efcc3f00fe67dee78c94b16c2f8692
[2025-11-04 10:55:41] ✓ Docker daemon communication OK
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] --- Safety Check: ESPHome Container ---
[2025-11-04 10:55:41] ✓ ESPHome container found: addon_5c53de3b_esphome

[2025-11-04 10:55:41] ⚠ Could not determine ESPHome version

[2025-11-04 10:55:41]
[2025-11-04 10:55:41] --- Safety Check: ESPHome Configuration ---
[2025-11-04 10:55:41] ✓ ESPHome config directory accessible
[2025-11-04 10:55:41] ✓ Found 38 device configuration(s)
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] --- Safety Checks Complete ---
[2025-11-04 10:55:41] ✓ All safety checks passed
[2025-11-04 10:55:41] ✓ Operating boundaries:
[2025-11-04 10:55:41] • Docker container: addon_5c53de3b_esphome
[2025-11-04 10:55:41] • Config directory: /config/esphome
[2025-11-04 10:55:41] • Build output: /config/esphome/builds/
[2025-11-04 10:55:41] • No access to: host system, other containers, external networks
[2025-11-04 10:55:41] ===============================================================================
[2025-11-04 10:55:41] ESPHome Selective Updates v2.0
[2025-11-04 10:55:41] ===============================================================================
[2025-11-04 10:55:41] ⚠ DRY RUN MODE - No actual updates will be performed
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] --- Device Discovery ---
[2025-11-04 10:55:41] Found 38 total device configuration(s)
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] --- Filtering Devices ---
[2025-11-04 10:55:41] Devices needing update: 0
[2025-11-04 10:55:41] Devices to skip: 38
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] Skipped devices:
[2025-11-04 10:55:41] • SonOff Touch Wandschalter: already updated this run
[2025-11-04 10:55:41] • carports: already updated this run
[2025-11-04 10:55:41] • chinese_lantern: already updated this run
[2025-11-04 10:55:41] • controller-frank: already updated this run
[2025-11-04 10:55:41] • controller-gh: already updated this run
[2025-11-04 10:55:41] • dalybms: already updated this run
[2025-11-04 10:55:41] • droplet: already updated this run
[2025-11-04 10:55:41] • esp32-cam-gh: already updated this run
[2025-11-04 10:55:41] • esszimmer-nspanel: already updated this run
[2025-11-04 10:55:41] • everything-presence-one-fb06d4: already updated this run
[2025-11-04 10:55:41] • fassade: already updated this run
[2025-11-04 10:55:41] • gaszaehler: already updated this run
[2025-11-04 10:55:41] • h801-bad-oben: already updated this run
[2025-11-04 10:55:41] • h801_bad: already updated this run
[2025-11-04 10:55:41] • h801_flur_treppe: already updated this run
[2025-11-04 10:55:41] • heating_system_temperatures: already updated this run
[2025-11-04 10:55:41] • heizkoerper-vorraum-bad-2: already updated this run
[2025-11-04 10:55:41] • heizstab_sonoff: already updated this run
[2025-11-04 10:55:41] • heizungskeller: already updated this run
[2025-11-04 10:55:41] • irrigation-orchids: already updated this run
[2025-11-04 10:55:41] • irrigation_valves: already updated this run
[2025-11-04 10:55:41] • jalousie_steuerung_wintergarten: already updated this run
[2025-11-04 10:55:41] • keller_entry: already updated this run
[2025-11-04 10:55:41] • klingel: already updated this run
[2025-11-04 10:55:41] • led_strip_samsung_monitor: already updated this run
[2025-11-04 10:55:41] • leds-toilette-unten: already updated this run
[2025-11-04 10:55:41] • motion_sensor_eingang: already updated this run
[2025-11-04 10:55:41] • schalter-vorraum-oben-badseitig: already updated this run
[2025-11-04 10:55:41] • secrets: already updated this run
[2025-11-04 10:55:41] • sml-reader: already updated this run
[2025-11-04 10:55:41] • sonoff_touch_vorraum_oben: already updated this run
[2025-11-04 10:55:41] • steckdose-treppe: already updated this run
[2025-11-04 10:55:41] • steckdose_carport2: already updated this run
[2025-11-04 10:55:41] • tor: already updated this run
[2025-11-04 10:55:41] • traffic_signal_for_phase_consumption: already updated this run
[2025-11-04 10:55:41] • waschmaschinen_keller: already updated this run
[2025-11-04 10:55:41] • wasser_bad_oben: already updated this run
[2025-11-04 10:55:41] • wintergarten: already updated this run
[2025-11-04 10:55:41]
[2025-11-04 10:55:41] ✓ No devices need updating. All done!
s6-rc: info: service legacy-services: stopping
s6-rc: info: service legacy-services successfully stopped
s6-rc: info: service legacy-cont-init: stopping
s6-rc: info: service legacy-cont-init successfully stopped
s6-rc: info: service fix-attrs: stopping
s6-rc: info: service fix-attrs successfully stopped
s6-rc: info: service s6rc-oneshot-runner: stopping
s6-rc: info: service s6rc-oneshot-runner successfully stopped

[bferd]

Same issue, different log entry.

s6-rc: info: service s6rc-oneshot-runner: starting
s6-rc: info: service s6rc-oneshot-runner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service fix-attrs successfully started
s6-rc: info: service legacy-cont-init: starting
s6-rc: info: service legacy-cont-init successfully started
s6-rc: info: service legacy-services: starting
s6-rc: info: service legacy-services successfully started
[INFO] ======================================================================
[INFO] ESPHome Selective Updates - Starting
[INFO] ======================================================================
[INFO] Configuration:
[INFO] ESPHome container: addon_5c53de3b_esphome
[INFO] Dry run mode: true
[INFO]
[INFO] Checking Docker socket availability...
[INFO] ✓ Docker socket found: /run/docker.sock
[INFO]
[INFO] Verifying Docker CLI...
[INFO] ✓ Docker CLI available: Docker version 25.0.5, build d260a54c81efcc3f00fe67dee78c94b16c2f8692
[INFO]
[INFO] Testing Docker daemon connection...
[INFO] ✓ Docker daemon connection OK
[INFO]
[INFO] Verifying ESPHome container 'addon_5c53de3b_esphome'...
[INFO] ✓ ESPHome container found and accessible
[INFO]
[INFO] Detecting ESPHome version...

[INFO] ✓ ESPHome version: unknown

[INFO]
[INFO] ======================================================================
[INFO] Pre-flight Checks Complete
[INFO] ======================================================================
[INFO] ✓ Docker socket: /run/docker.sock
[INFO] ✓ Docker daemon: Connected
[INFO] ✓ ESPHome container: addon_5c53de3b_esphome
[INFO] ✓ ESPHome version: unknown
[INFO]
[INFO] Safety boundaries:
[INFO] • Will only access: addon_5c53de3b_esphome
[INFO] • Will only modify: /config/esphome/builds/
[INFO] • No access to: host system, other containers
[INFO]
[INFO] Starting Python updater script...
[INFO] ======================================================================
[INFO]
[2025-12-04 22:09:06] Add-on version changed: None → 2.0.0
[2025-12-04 22:09:06] Log file cleared due to version change
[2025-12-04 22:09:06] ===============================================================================
[2025-12-04 22:09:06] Safety Verification
[2025-12-04 22:09:06] ===============================================================================
[2025-12-04 22:09:06]
[2025-12-04 22:09:06] --- Safety Check: Docker Socket ---
[2025-12-04 22:09:06] ✓ Docker socket found: /run/docker.sock
[2025-12-04 22:09:06] ✓ Docker CLI available: Docker version 25.0.5, build d260a54c81efcc3f00fe67dee78c94b16c2f8692
[2025-12-04 22:09:06] ✓ Docker daemon communication OK
[2025-12-04 22:09:06]
[2025-12-04 22:09:06] --- Safety Check: ESPHome Container ---
[2025-12-04 22:09:06] ✓ ESPHome container found: addon_5c53de3b_esphome
[2025-12-04 22:09:07] ⚠ Could not determine ESPHome version
[2025-12-04 22:09:07]
[2025-12-04 22:09:07] --- Safety Check: ESPHome Configuration ---
[2025-12-04 22:09:07] ✓ ESPHome config directory accessible
[2025-12-04 22:09:07] ✓ Found 17 device configuration(s)
[2025-12-04 22:09:07]
[2025-12-04 22:09:07] --- Safety Checks Complete ---
[2025-12-04 22:09:07] ✓ All safety checks passed
[2025-12-04 22:09:07] ✓ Operating boundaries:
[2025-12-04 22:09:07] • Docker container: addon_5c53de3b_esphome
[2025-12-04 22:09:07] • Config directory: /config/esphome
[2025-12-04 22:09:07] • Build output: /config/esphome/builds/
[2025-12-04 22:09:07] • No access to: host system, other containers, external networks
[2025-12-04 22:09:07] ===============================================================================
[2025-12-04 22:09:07] ESPHome Selective Updates v2.0
[2025-12-04 22:09:07] ===============================================================================
[2025-12-04 22:09:07] ⚠ DRY RUN MODE - No actual updates will be performed
[2025-12-04 22:09:07]
[2025-12-04 22:09:07] --- Device Discovery ---
[2025-12-04 22:09:07] Found 17 total device configuration(s)
[2025-12-04 22:09:07]
[2025-12-04 22:09:07] --- Filtering Devices ---
[2025-12-04 22:09:07] Devices needing update: 17
[2025-12-04 22:09:07] Devices to skip: 0
[2025-12-04 22:09:07] ===============================================================================
[2025-12-04 22:09:07] Processing 17 Device(s)
[2025-12-04 22:09:07] ===============================================================================
[2025-12-04 22:09:07]
[2025-12-04 22:09:07] [1/17] Processing: armoire-dimmer
[2025-12-04 22:09:07] Config: armoire-dimmer.yaml
[2025-12-04 22:09:07] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:07] No manual IP configured; using mDNS: armoire-dimmer.local
[2025-12-04 22:09:07] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:07] ✓ armoire-dimmer completed successfully
[2025-12-04 22:09:10]
[2025-12-04 22:09:10] [2/17] Processing: downstairs-dryer
[2025-12-04 22:09:10] Config: downstairs-dryer.yaml
[2025-12-04 22:09:10] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:10] No manual IP configured; using mDNS: downstairs-dryer.local
[2025-12-04 22:09:10] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:10] ✓ downstairs-dryer completed successfully
[2025-12-04 22:09:13]
[2025-12-04 22:09:13] [3/17] Processing: esphome-web-65fd43
[2025-12-04 22:09:13] Config: esphome-web-65fd43.yaml
[2025-12-04 22:09:13] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:13] No manual IP configured; using mDNS: saltlevelmonitor.local
[2025-12-04 22:09:13] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:13] ✓ esphome-web-65fd43 completed successfully
[2025-12-04 22:09:16]
[2025-12-04 22:09:16] [4/17] Processing: esphome-web-9428c4
[2025-12-04 22:09:16] Config: esphome-web-9428c4.yaml
[2025-12-04 22:09:16] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:16] No manual IP configured; using mDNS: kombucha.local
[2025-12-04 22:09:16] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:16] ✓ esphome-web-9428c4 completed successfully
[2025-12-04 22:09:19]
[2025-12-04 22:09:19] [5/17] Processing: front-porch-temperature-sensor
[2025-12-04 22:09:19] Config: front-porch-temperature-sensor.yaml
[2025-12-04 22:09:19] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:19] No manual IP configured; using mDNS: front-porch-temperature-sensor.local
[2025-12-04 22:09:19] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:19] ✓ front-porch-temperature-sensor completed successfully
[2025-12-04 22:09:22]
[2025-12-04 22:09:22] [6/17] Processing: library-light
[2025-12-04 22:09:22] Config: library-light.yaml
[2025-12-04 22:09:22] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:22] No manual IP configured; using mDNS: library-light.local
[2025-12-04 22:09:22] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:22] ✓ library-light completed successfully
[2025-12-04 22:09:25]
[2025-12-04 22:09:25] [7/17] Processing: mechanical-room-thermostat
[2025-12-04 22:09:25] Config: mechanical-room-thermostat.yaml
[2025-12-04 22:09:25] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:25] No manual IP configured; using mDNS: "mechanical-room-thermostat".local
[2025-12-04 22:09:25] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:25] ✓ mechanical-room-thermostat completed successfully
[2025-12-04 22:09:28]
[2025-12-04 22:09:28] [8/17] Processing: mechanical-room-vent-fan
[2025-12-04 22:09:28] Config: mechanical-room-vent-fan.yaml
[2025-12-04 22:09:28] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:28] No manual IP configured; using mDNS: mechanical-room-vent-fan.local
[2025-12-04 22:09:28] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:28] ✓ mechanical-room-vent-fan completed successfully
[2025-12-04 22:09:31]
[2025-12-04 22:09:31] [9/17] Processing: north-heat-cable
[2025-12-04 22:09:31] Config: north-heat-cable.yaml
[2025-12-04 22:09:31] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:31] No manual IP configured; using mDNS: north-heat-cable.local
[2025-12-04 22:09:31] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:31] ✓ north-heat-cable completed successfully
[2025-12-04 22:09:34]
[2025-12-04 22:09:34] [10/17] Processing: plug-s31--1
[2025-12-04 22:09:34] Config: plug-s31--1.yaml
[2025-12-04 22:09:34] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:34] No manual IP configured; using mDNS: plug-s31--1.local
[2025-12-04 22:09:34] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:34] ✓ plug-s31--1 completed successfully
[2025-12-04 22:09:37]
[2025-12-04 22:09:37] [11/17] Processing: power-monitor
[2025-12-04 22:09:37] Config: power-monitor.yaml
[2025-12-04 22:09:37] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:37] No manual IP configured; using mDNS: ${devicename}.local
[2025-12-04 22:09:37] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:37] ✓ power-monitor completed successfully
[2025-12-04 22:09:40]
[2025-12-04 22:09:40] [12/17] Processing: secrets
[2025-12-04 22:09:40] Config: secrets.yaml
[2025-12-04 22:09:40] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:40] No manual IP configured; using mDNS: secrets.local
[2025-12-04 22:09:40] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:40] ✓ secrets completed successfully
[2025-12-04 22:09:43]
[2025-12-04 22:09:43] [13/17] Processing: south-heat-cable
[2025-12-04 22:09:43] Config: south-heat-cable.yaml
[2025-12-04 22:09:43] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:43] No manual IP configured; using mDNS: south-heat-cable.local
[2025-12-04 22:09:43] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:43] ✓ south-heat-cable completed successfully
[2025-12-04 22:09:46]
[2025-12-04 22:09:46] [14/17] Processing: speaker-switcher
[2025-12-04 22:09:46] Config: speaker-switcher.yaml
[2025-12-04 22:09:46] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:46] No manual IP configured; using mDNS: speaker-switcher.local
[2025-12-04 22:09:46] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:46] ✓ speaker-switcher completed successfully
[2025-12-04 22:09:49]
[2025-12-04 22:09:49] [15/17] Processing: upstairs-bathroom-fan
[2025-12-04 22:09:49] Config: upstairs-bathroom-fan.yaml
[2025-12-04 22:09:49] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:49] No manual IP configured; using mDNS: upstairs-bathroom-fan.local
[2025-12-04 22:09:49] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:49] ✓ upstairs-bathroom-fan completed successfully
[2025-12-04 22:09:52]
[2025-12-04 22:09:52] [16/17] Processing: upstairs-dryer
[2025-12-04 22:09:52] Config: upstairs-dryer.yaml
[2025-12-04 22:09:52] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:52] No manual IP configured; using mDNS: upstairs-dryer.local
[2025-12-04 22:09:52] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:52] ✓ upstairs-dryer completed successfully
[2025-12-04 22:09:55]
[2025-12-04 22:09:55] [17/17] Processing: veranda-light
[2025-12-04 22:09:55] Config: veranda-light.yaml
[2025-12-04 22:09:55] Versions: deployed=unknown, current=unknown
[2025-12-04 22:09:55] No manual IP configured; using mDNS: veranda-light.local
[2025-12-04 22:09:55] → DRY RUN: Would compile and upload here
[2025-12-04 22:09:55] ✓ veranda-light completed successfully
[2025-12-04 22:09:55] ===============================================================================
[2025-12-04 22:09:55] Summary
[2025-12-04 22:09:55] ===============================================================================
[2025-12-04 22:09:55] Total devices: 17
[2025-12-04 22:09:55] Successfully updated: 17
[2025-12-04 22:09:55] Failed: 0
[2025-12-04 22:09:55] Skipped: 0
[2025-12-04 22:09:55]
[2025-12-04 22:09:55] ⚠ DRY RUN MODE - No actual changes were made
[2025-12-04 22:09:55]
[2025-12-04 22:09:55] ✓ ESPHome Selective Updates complete
s6-rc: info: service legacy-services: stopping
s6-rc: info: service legacy-services successfully stopped

[bferd]

Did a bit of research this morning. Here are some alternate code samples that work (with outputs) for the ESPhome version block.

➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | grep -o '[0-9]+.[0-9]+.[0-9]+' | head -1
2025.11.4
➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | awk '/Version:/ {print $2}'
2025.11.4
➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | sed -nr 's/Version:[[:space:]](.)/\1/p'
2025.11.4
➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | grep '^Version:' | cut -d: -f2 | xargs
2025.11.4
➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | grep -o '[0-9]+.[0-9]+.[0-9]+' | head -1

I like the 3rd one the best, so line 134 of run.sh would be:

ESPHOME_VERSION=$(docker exec "${ESPHOME_CONTAINER}" esphome version 2>/dev/null | awk '/Version:/ {print $2}' || echo "unknown")

[drothenberger]

Did a bit of research this morning. Here are some alternate code samples that work (with outputs) for the ESPhome version block.

➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | grep -o '[0-9]+.[0-9]+.[0-9]+' | head -1 2025.11.4 ➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | awk '/Version:/ {print $2}' 2025.11.4 ➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | sed -nr 's/Version:[[:space:]](.)/\1/p' 2025.11.4 ➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | grep '^Version:' | cut -d: -f2 | xargs 2025.11.4 ➜ ~ docker exec addon_5c53de3b_esphome esphome version 2>/dev/null | grep -o '[0-9]+.[0-9]+.[0-9]+' | head -1

I like the 3rd one the best, so line 134 of run.sh would be:

ESPHOME_VERSION=$(docker exec "${ESPHOME_CONTAINER}" esphome version 2>/dev/null | awk '/Version:/ {print $2}' || echo "unknown")

I recommend the following change instead:

ESPHOME_VERSION=$(docker exec "${ESPHOME_CONTAINER}" esphome version 2>/dev/null | grep -o '\(ESPHome|Version:\) [0-9][0-9.]*' | cut -d' ' -f2 || echo "unknown")

This is backwards compatible in case the user is using an ESPHome version before the "esphome version" command output was changed.