Update run.sh to include lowercase I in hostname. #26
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hostname -I is invalid. lowercase -i added to hostname to allow for proper execution/
WalkthroughThe pull request modifies the Changes
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Actionable comments posted: 1
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casaos-add-lan-ip-to-nextcloud-config/run.sh(1 hunks)
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casaos-add-lan-ip-to-nextcloud-config/run.sh (1)
4-4: Verify IP detection behaviorLet's verify how the current and suggested IP detection methods behave in the environment.
| @@ -1,7 +1,7 @@ | |||
| #!/usr/bin/env bash | |||
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| # Get the LAN IP address | |||
| lan_ip=$(hostname -I | awk '{print $1}') | |||
| lan_ip=$(hostname -i | awk '{print $1}') | |||
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Consider using more reliable IP detection methods
While hostname -i might work in some cases, it can be unreliable as it may return 127.0.1.1 on some systems, which would break Nextcloud's external access. Consider using more reliable methods to detect the LAN IP.
Here's a more robust implementation:
-lan_ip=$(hostname -i | awk '{print $1}')
+# Get the first non-localhost IPv4 address
+lan_ip=$(ip -4 addr show | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | grep -v '^127\.' | head -n1)This solution:
- Uses
ipcommand which is more reliable - Explicitly filters for IPv4 addresses
- Excludes localhost addresses
- Takes the first valid LAN IP
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| lan_ip=$(hostname -i | awk '{print $1}') | |
| # Get the first non-localhost IPv4 address | |
| lan_ip=$(ip -4 addr show | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | grep -v '^127\.' | head -n1) |
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that may be, however as written this does not resolve. ‘hostname -I’ results in the following error message followed by usage:
hostname: invalid option — ‘I’
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@simianspaceman, thanks for clarifying why you switched to the lowercase -i. Indeed, some environments don’t recognize the uppercase -I option, leading to that error. If you find that hostname -i occasionally yields 127.0.1.1 instead of your true LAN IP, you might consider switching to the more robust ip-based approach. Otherwise, if your environment is guaranteed to return the correct IP with hostname -i, then this fix should resolve your immediate issue.
✏️ Learnings added
Learnt from: simianspaceman
PR: bigbeartechworld/big-bear-scripts#26
File: casaos-add-lan-ip-to-nextcloud-config/run.sh:4-4
Timestamp: 2025-01-05T15:21:39.952Z
Learning: On certain systems, the `hostname` command does not support the uppercase `-I` option, leading to an invalid option error. A lowercase `-i` may work, but it can return `127.0.1.1` on some systems.
Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.
hostname -I is invalid. lowercase -i added to hostname to allow for proper execution.
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