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Introduce an optional `apt_mirror` parameter to `get_user_builder()` and `get_min_user_builder()` to allow overriding the default `archive.ubuntu.com` mirror before the first `apt-get update`. Add a reusable `switch_apt_mirror()` helper that updates APT sources in both DEB822 (`ubuntu.sources`) and legacy (`sources.list`) formats. The helper intentionally leaves `security.ubuntu.com` untouched so security updates continue to come from Canonical. This is particularly useful when the default mirror is slow or under incident. A common configuration is `mirror://mirrors.ubuntu.com/mirrors.txt` for automatic geographic selection. The mirror switch is applied early in the builder lifecycle to ensure all subsequent package operations benefit from it. Signed-off-by: Antonio Paolillo <apaolill@gmail.com>
EstAK
approved these changes
Apr 17, 2026
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Introduce an optional
apt_mirrorparameter toget_user_builder()andget_min_user_builder()to allow overriding the defaultarchive.ubuntu.commirror before the firstapt-get update.Add a reusable
switch_apt_mirror()helper that updates APT sources in both DEB822 (ubuntu.sources) and legacy (sources.list) formats. The helper intentionally leavessecurity.ubuntu.comuntouched so security updates continue to come from Canonical.This is particularly useful when the default mirror is slow or under incident. A common configuration is
mirror://mirrors.ubuntu.com/mirrors.txtfor automatic geographic selection.The mirror switch is applied early in the builder lifecycle to ensure all subsequent package operations benefit from it.