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Offline CUPS from the normal menu, local-file sites, build-dep install

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- CUPS (Addons -> CUPS Printing, from ./install.sh or the Web UI) now
  installs from the offline bundle by itself when the kiosk can't reach
  the Ubuntu archive: lib/config.sh's run_with_offline_fallback switches
  apt to the bundle (kiosk-offline-apt on) around the install and back
  afterwards. No-op on manual installs or when online.
- Fix cups_is_installed reporting "not installed" for an installed CUPS:
  `dpkg -l | grep -q` under install.sh's pipefail fails when grep exits
  early and dpkg takes SIGPIPE. Uses dpkg-query on the one package now.
- Sites: an absolute path (/home/kiosk/docs/menu.pdf) is accepted and
  turned into a percent-encoded file:// URL, identically in the Sites
  menu (sites_parse_url) and the Web UI (parseUrl, with tests). Electron
  42 shows local HTML, PDFs (built-in viewer) and images as-is.
- iso/build-iso.sh checks its build tools (plus the --offline ones) and
  offers to `sudo apt install` what's missing; --install-deps does it
  without asking. --offline now refuses non-amd64 hosts up front.

Tested: offline chroot of the 26.04.1 server filesystem - action_install_cups
installed CUPS + printer-driver-all/hplip/gutenprint from the bundle with
no network and left apt back on normal sources; webui test suite passes;
Electron 42 rendered a file:// PDF and PNG with spaces/# in the path;
build-iso.sh stopped with the install command when apt-utils was missing
and no TTY, and installed it and built the ISO with --install-deps.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Cjz8a58eB5P9sUweqd3NHm
This commit is contained in:
Claude
2026-10-03 13:29:04 +00:00
parent 0b5d958fcc
commit 5792e201b6
9 changed files with 119 additions and 31 deletions
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iso/firstboot/kiosk-offline-apt
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@@ -8,10 +8,10 @@
#
# Installed by the custom ISO (iso/build-iso.sh); the bundle itself is
# only there on ISOs built with --offline. kiosk-firstboot turns this on
# by itself when first boot finds no internet, and back off afterwards.
# By hand it's for installing things later with no internet - e.g. the
# CUPS addon: `sudo kiosk-offline-apt on`, ./install.sh -> Addons -> CUPS,
# then `sudo kiosk-offline-apt off`. While it's on, install.sh also
# by itself when first boot finds no internet, and back off afterwards;
# so does the CUPS addon install (lib/config.sh's
# run_with_offline_fallback). By hand it's for installing anything else
# from the bundle with no internet. While it's on, install.sh also
# unpacks the bundle's prebuilt node_modules instead of running npm
# (lib/config.sh's offline_mode_active checks for the file this writes).
#