K-114: input validation in build.func + mini CI (nexus-hub card)
- validation helpers: sanitize_input trims CR/edge whitespace only; embedded control/non-ASCII bytes FAIL validation and re-prompt with a hint (2026-06-11 incident: invisible byte in a pasted VLAN tag broke pct create mid-run) - never silently stripped - prompt_lxc_config: every prompt validated (uint for CTID/disk/cores/ RAM, VLAN 1-4094, hostname/token formats, IP/CIDR/gateway, DNS list); env-provided values are sanitized + validated too (abort, no re-prompt loop in non-interactive use); helpers reusable for app prompts - tests/test_validation.sh: 34 cases incl. the 2<0x80>0 repro, re-prompt simulation, BASH_REMATCH clobbering regression (is_cidr), env dry-run of prompt_lxc_config without PVE/TTY - tests/check_ct_source.sh: every ct/*.sh must source build.func (bug shipped twice); negative proof via prepared fixture in the test suite - .gitea/workflows/ci.yml: bash -n over all scripts, source-check, validation tests, shellcheck if present (documented skip otherwise) - README: contributions via PR with cross-review (binding)
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@@ -24,6 +24,12 @@ CTID=200 HOSTNAME=devpi DISK_SIZE=30 RAM=4096 CORES=4 IPCFG=dhcp \
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All defaults (`DEFAULT_HOSTNAME`, `DEFAULT_DISK`, …) are settable per-call via env vars as well.
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## Contributing (verbindlich seit K-114)
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**Alle Änderungen laufen als PR mit Cross-Review** — keine Direkt-Commits auf `main`. Hintergrund: Der „`build.func` nicht gesourct"-Bug hat es einmal bis in die Produktion geschafft (authentik-Anlage), während dieselbe Fehlerklasse im nexus-db-PR vom Review gefangen wurde. Die CI (`.gitea/workflows/ci.yml`, Runner-Label `nexus`) erzwingt zusätzlich: `bash -n` über alle Scripts, „jedes `ct/*.sh` sourct `build.func`" (`tests/check_ct_source.sh`) und die Validierungs-Unit-Tests (`tests/test_validation.sh`).
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Eingaben in `prompt_lxc_config` sind validiert (Ziffern-Checks, IP/CIDR/Gateway-Format, Re-Prompt bei unsichtbaren Steuer-/Non-ASCII-Zeichen — Lesson vom 2026-06-11). Neue App-Prompts bitte über `prompt_validated`/`require_valid` aus `lib/build.func` bauen statt nacktem `read`.
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## Repo layout
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```
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