installer: ask for confirmation on multi-user install without systemd
On Linux a user can go through all the way through the multi-user install and find out at the end that they now have to manually configure their init system to launch the nix daemon. I suspect that for a significant number of users this is not what they wanted. They might prefer a single-user install. Now they have to manually uninstall nix before they can go through the single-user install. This introduces a confirmation dialog before the install in that specific situation to make sure that they want to proceed. See also: https://github.com/NixOS/nix/issues/4999#issuecomment-1064188080 This closes #4999 but rejecting it and closing that issue anyways would also be valid.
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@ -423,6 +423,18 @@ EOF
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fi
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done
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if [ "$(uname -s)" = "Linux" ] && [ ! -e /run/systemd/system ]; then
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warning <<EOF
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We did not detect systemd on your system. With a multi-user install
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without systemd you will have to manually configure your init system to
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launch the Nix daemon after installation.
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EOF
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if ! ui_confirm "Do you want to proceed with a multi-user installation?"; then
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failure <<EOF
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You have aborted the installation.
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EOF
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fi
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fi
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}
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setup_report() {
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