forked from lix-project/lix
7313aa267b
The install-multi-user script uses blue, green, and red colors, as well as bold and underline, to add helpful formatting that helps structure its rather voluminous output. Unfortunately, the terminal escape sequences it uses are not quite well-formed. The relevant information is all there, just obscured by some extra noise, a leading parameter `38`. Empirically, the result is: * On macOS, in both Terminal.app and iTerm2, the spurious `38` is ignored, the rest of the escape sequence is applied, and the colors show up as intended. * On Linux, in at least gnome-terminal and xterm, the spurious `38` and the next parameter after it are ignored, and what's left is applied. So in the sequence `38;4;32`, the 4 (underline) is ignored but the 32 (green) takes effect; in a more typical sequence like `38;34`, the 34 (blue) is ignored and nothing happens. These codes are all unchanged since this script's origins as a Darwin-only script -- so the fact that they work fine in common macOS terminals goes some way to explain how the bug arose. Happily, we can make the colors work as intended by just deleting the extra `38;`. Tested in all four terminals mentioned above; the new codes work correctly on all of them, and on the two macOS terminals they work exactly the same as before. --- In a bit more technical detail -- perhaps more than anyone, me included, ever wanted to know, but now that I've gone and learned it I'll write it down anyway :) -- here's what's happening in these codes: An ECMA-48 "control sequence" begins with `\033[` aka "CSI", contains any number of parameters as semicolon-separated decimal numbers (plus sometimes other wrinkles), and ends with a byte from 0x40..0x7e. In our case, with `m` aka "SGR", "Select Graphic Rendition". An SGR control sequence `\033[...m` sets colors, fonts, text styles, etc. In particular a parameter `31` means red, `32` green, `34` blue, `4` underline, and `0` means reset to normal. Those are all we use. There is also a `38`. This is used for setting colors too... but it needs arguments. `38;5;nn` is color nn from a 256-color palette, and `38;2;rr;gg;bb` has the given RGB values. There is no meaning defined for `38;1` or `38;34` etc. On seeing a parameter `38` followed by an unrecognized argument for it, apparently some implementations (as seen on macOS) discard only the `38` and others (as seen on Linux) discard the argument too before resuming.
705 lines
19 KiB
Bash
705 lines
19 KiB
Bash
#!/usr/bin/env bash
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set -eu
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set -o pipefail
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# Sourced from:
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# - https://github.com/LnL7/nix-darwin/blob/8c29d0985d74b4a990238497c47a2542a5616b3c/bootstrap.sh
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# - https://gist.github.com/expipiplus1/e571ce88c608a1e83547c918591b149f/ac504c6c1b96e65505fbda437a28ce563408ecb0
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# - https://github.com/NixOS/nixos-org-configurations/blob/a122f418797713d519aadf02e677fce0dc1cb446/delft/scripts/nix-mac-installer.sh
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# - https://github.com/matthewbauer/macNixOS/blob/f6045394f9153edea417be90c216788e754feaba/install-macNixOS.sh
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# - https://gist.github.com/LnL7/9717bd6cdcb30b086fd7f2093e5f8494/86b26f852ce563e973acd30f796a9a416248c34a
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#
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# however tracking which bits came from which would be impossible.
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readonly ESC='\033[0m'
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readonly BOLD='\033[1m'
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readonly BLUE='\033[34m'
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readonly BLUE_UL='\033[4;34m'
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readonly GREEN='\033[32m'
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readonly GREEN_UL='\033[4;32m'
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readonly RED='\033[31m'
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readonly NIX_USER_COUNT="32"
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readonly NIX_BUILD_GROUP_ID="30000"
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readonly NIX_BUILD_GROUP_NAME="nixbld"
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readonly NIX_FIRST_BUILD_UID="30001"
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# Please don't change this. We don't support it, because the
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# default shell profile that comes with Nix doesn't support it.
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readonly NIX_ROOT="/nix"
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readonly PROFILE_TARGETS=("/etc/bashrc" "/etc/profile.d/nix.sh" "/etc/zshrc")
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readonly PROFILE_BACKUP_SUFFIX=".backup-before-nix"
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readonly PROFILE_NIX_FILE="$NIX_ROOT/var/nix/profiles/default/etc/profile.d/nix-daemon.sh"
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readonly NIX_INSTALLED_NIX="@nix@"
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readonly NIX_INSTALLED_CACERT="@cacert@"
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readonly EXTRACTED_NIX_PATH="$(dirname "$0")"
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readonly ROOT_HOME=$(echo ~root)
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if [ -t 0 ]; then
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readonly IS_HEADLESS='no'
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else
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readonly IS_HEADLESS='yes'
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fi
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headless() {
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if [ "$IS_HEADLESS" = "yes" ]; then
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return 0
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else
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return 1
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fi
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}
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contactme() {
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echo "We'd love to help if you need it."
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echo ""
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echo "If you can, open an issue at https://github.com/nixos/nix/issues"
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echo ""
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echo "Or feel free to contact the team,"
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echo " - on IRC #nixos on irc.freenode.net"
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echo " - on twitter @nixos_org"
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}
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uninstall_directions() {
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subheader "Uninstalling nix:"
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local step=0
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if poly_service_installed_check; then
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step=$((step + 1))
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poly_service_uninstall_directions "$step"
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fi
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for profile_target in "${PROFILE_TARGETS[@]}"; do
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if [ -e "$profile_target" ] && [ -e "$profile_target$PROFILE_BACKUP_SUFFIX" ]; then
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step=$((step + 1))
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cat <<EOF
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$step. Restore $profile_target$PROFILE_BACKUP_SUFFIX back to $profile_target
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sudo mv $profile_target$PROFILE_BACKUP_SUFFIX $profile_target
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(after this one, you may need to re-open any terminals that were
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opened while it existed.)
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EOF
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fi
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done
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step=$((step + 1))
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cat <<EOF
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$step. Delete the files Nix added to your system:
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sudo rm -rf /etc/nix $NIX_ROOT $ROOT_HOME/.nix-profile $ROOT_HOME/.nix-defexpr $ROOT_HOME/.nix-channels $HOME/.nix-profile $HOME/.nix-defexpr $HOME/.nix-channels
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and that is it.
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EOF
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}
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nix_user_for_core() {
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printf "nixbld%d" "$1"
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}
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nix_uid_for_core() {
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echo $((NIX_FIRST_BUILD_UID + $1 - 1))
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}
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_textout() {
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echo -en "$1"
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shift
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if [ "$*" = "" ]; then
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cat
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else
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echo "$@"
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fi
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echo -en "$ESC"
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}
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header() {
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follow="---------------------------------------------------------"
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header=$(echo "---- $* $follow$follow$follow" | head -c 80)
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echo ""
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_textout "$BLUE" "$header"
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}
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warningheader() {
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follow="---------------------------------------------------------"
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header=$(echo "---- $* $follow$follow$follow" | head -c 80)
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echo ""
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_textout "$RED" "$header"
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}
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subheader() {
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echo ""
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_textout "$BLUE_UL" "$*"
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}
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row() {
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printf "$BOLD%s$ESC:\\t%s\\n" "$1" "$2"
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}
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task() {
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echo ""
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ok "~~> $1"
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}
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bold() {
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echo "$BOLD$*$ESC"
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}
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ok() {
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_textout "$GREEN" "$@"
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}
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warning() {
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warningheader "warning!"
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cat
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echo ""
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}
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failure() {
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header "oh no!"
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_textout "$RED" "$@"
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echo ""
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_textout "$RED" "$(contactme)"
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trap finish_cleanup EXIT
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exit 1
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}
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ui_confirm() {
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_textout "$GREEN$GREEN_UL" "$1"
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if headless; then
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echo "No TTY, assuming you would say yes :)"
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return 0
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fi
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local prompt="[y/n] "
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echo -n "$prompt"
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while read -r y; do
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if [ "$y" = "y" ]; then
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echo ""
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return 0
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elif [ "$y" = "n" ]; then
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echo ""
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return 1
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else
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_textout "$RED" "Sorry, I didn't understand. I can only understand answers of y or n"
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echo -n "$prompt"
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fi
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done
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echo ""
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return 1
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}
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__sudo() {
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local expl="$1"
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local cmd="$2"
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shift
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header "sudo execution"
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echo "I am executing:"
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echo ""
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printf " $ sudo %s\\n" "$cmd"
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echo ""
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echo "$expl"
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echo ""
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return 0
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}
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_sudo() {
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local expl="$1"
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shift
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if ! headless; then
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__sudo "$expl" "$*"
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fi
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sudo "$@"
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}
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readonly SCRATCH=$(mktemp -d -t tmp.XXXXXXXXXX)
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function finish_cleanup {
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rm -rf "$SCRATCH"
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}
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function finish_fail {
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finish_cleanup
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failure <<EOF
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Jeeze, something went wrong. If you can take all the output and open
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an issue, we'd love to fix the problem so nobody else has this issue.
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:(
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EOF
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}
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trap finish_fail EXIT
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channel_update_failed=0
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function finish_success {
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finish_cleanup
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ok "Alright! We're done!"
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if [ "x$channel_update_failed" = x1 ]; then
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echo ""
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echo "But fetching the nixpkgs channel failed. (Are you offline?)"
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echo "To try again later, run \"sudo -i nix-channel --update nixpkgs\"."
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fi
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cat <<EOF
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Before Nix will work in your existing shells, you'll need to close
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them and open them again. Other than that, you should be ready to go.
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Try it! Open a new terminal, and type:
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$ nix-shell -p nix-info --run "nix-info -m"
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Thank you for using this installer. If you have any feedback, don't
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hesitate:
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$(contactme)
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EOF
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}
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validate_starting_assumptions() {
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poly_validate_assumptions
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if [ $EUID -eq 0 ]; then
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failure <<EOF
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Please do not run this script with root privileges. We will call sudo
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when we need to.
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EOF
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fi
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if type nix-env 2> /dev/null >&2; then
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warning <<EOF
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Nix already appears to be installed. This installer may run into issues.
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If an error occurs, try manually uninstalling, then rerunning this script.
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$(uninstall_directions)
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EOF
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fi
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for profile_target in "${PROFILE_TARGETS[@]}"; do
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if [ -e "$profile_target$PROFILE_BACKUP_SUFFIX" ]; then
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failure <<EOF
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When this script runs, it backs up the current $profile_target to
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$profile_target$PROFILE_BACKUP_SUFFIX. This backup file already exists, though.
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Please follow these instructions to clean up the old backup file:
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1. Copy $profile_target and $profile_target$PROFILE_BACKUP_SUFFIX to another place, just
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in case.
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2. Take care to make sure that $profile_target$PROFILE_BACKUP_SUFFIX doesn't look like
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it has anything nix-related in it. If it does, something is probably
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quite wrong. Please open an issue or get in touch immediately.
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EOF
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fi
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done
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}
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setup_report() {
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header "Nix config report"
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row " Temp Dir" "$SCRATCH"
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row " Nix Root" "$NIX_ROOT"
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row " Build Users" "$NIX_USER_COUNT"
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row " Build Group ID" "$NIX_BUILD_GROUP_ID"
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row "Build Group Name" "$NIX_BUILD_GROUP_NAME"
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if [ "${ALLOW_PREEXISTING_INSTALLATION:-}" != "" ]; then
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row "Preexisting Install" "Allowed"
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fi
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subheader "build users:"
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row " Username" "UID"
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for i in $(seq 1 "$NIX_USER_COUNT"); do
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row " $(nix_user_for_core "$i")" "$(nix_uid_for_core "$i")"
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done
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echo ""
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}
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create_build_group() {
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local primary_group_id
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task "Setting up the build group $NIX_BUILD_GROUP_NAME"
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if ! poly_group_exists "$NIX_BUILD_GROUP_NAME"; then
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poly_create_build_group
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row " Created" "Yes"
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else
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primary_group_id=$(poly_group_id_get "$NIX_BUILD_GROUP_NAME")
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if [ "$primary_group_id" -ne "$NIX_BUILD_GROUP_ID" ]; then
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failure <<EOF
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It seems the build group $NIX_BUILD_GROUP_NAME already exists, but
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with the UID $primary_group_id. This script can't really handle
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that right now, so I'm going to give up.
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You can fix this by editing this script and changing the
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NIX_BUILD_GROUP_ID variable near the top to from $NIX_BUILD_GROUP_ID
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to $primary_group_id and re-run.
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EOF
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else
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row " Exists" "Yes"
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fi
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fi
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}
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create_build_user_for_core() {
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local coreid
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local username
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local uid
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coreid="$1"
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username=$(nix_user_for_core "$coreid")
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uid=$(nix_uid_for_core "$coreid")
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task "Setting up the build user $username"
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if ! poly_user_exists "$username"; then
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poly_create_build_user "$username" "$uid" "$coreid"
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row " Created" "Yes"
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else
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actual_uid=$(poly_user_id_get "$username")
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if [ "$actual_uid" != "$uid" ]; then
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failure <<EOF
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It seems the build user $username already exists, but with the UID
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with the UID '$actual_uid'. This script can't really handle that right
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now, so I'm going to give up.
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If you already created the users and you know they start from
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$actual_uid and go up from there, you can edit this script and change
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NIX_FIRST_BUILD_UID near the top of the file to $actual_uid and try
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again.
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EOF
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else
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row " Exists" "Yes"
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fi
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fi
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if [ "$(poly_user_hidden_get "$username")" = "1" ]; then
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row " Hidden" "Yes"
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else
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poly_user_hidden_set "$username"
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row " Hidden" "Yes"
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fi
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if [ "$(poly_user_home_get "$username")" = "/var/empty" ]; then
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row " Home Directory" "/var/empty"
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else
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poly_user_home_set "$username" "/var/empty"
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row " Home Directory" "/var/empty"
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fi
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# We use grep instead of an equality check because it is difficult
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# to extract _just_ the user's note, instead it is prefixed with
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# some plist junk. This was causing the user note to always be set,
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# even if there was no reason for it.
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if ! poly_user_note_get "$username" | grep -q "Nix build user $coreid"; then
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row " Note" "Nix build user $coreid"
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else
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poly_user_note_set "$username" "Nix build user $coreid"
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row " Note" "Nix build user $coreid"
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fi
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if [ "$(poly_user_shell_get "$username")" = "/sbin/nologin" ]; then
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row " Logins Disabled" "Yes"
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else
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poly_user_shell_set "$username" "/sbin/nologin"
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row " Logins Disabled" "Yes"
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fi
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if poly_user_in_group_check "$username" "$NIX_BUILD_GROUP_NAME"; then
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row " Member of $NIX_BUILD_GROUP_NAME" "Yes"
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else
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poly_user_in_group_set "$username" "$NIX_BUILD_GROUP_NAME"
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row " Member of $NIX_BUILD_GROUP_NAME" "Yes"
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fi
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if [ "$(poly_user_primary_group_get "$username")" = "$NIX_BUILD_GROUP_ID" ]; then
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row " PrimaryGroupID" "$NIX_BUILD_GROUP_ID"
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else
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poly_user_primary_group_set "$username" "$NIX_BUILD_GROUP_ID"
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row " PrimaryGroupID" "$NIX_BUILD_GROUP_ID"
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fi
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}
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create_build_users() {
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for i in $(seq 1 "$NIX_USER_COUNT"); do
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create_build_user_for_core "$i"
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done
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}
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create_directories() {
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# FIXME: remove all of this because it duplicates LocalStore::LocalStore().
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_sudo "to make the basic directory structure of Nix (part 1)" \
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mkdir -pv -m 0755 /nix /nix/var /nix/var/log /nix/var/log/nix /nix/var/log/nix/drvs /nix/var/nix{,/db,/gcroots,/profiles,/temproots,/userpool} /nix/var/nix/{gcroots,profiles}/per-user
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_sudo "to make the basic directory structure of Nix (part 2)" \
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mkdir -pv -m 1775 /nix/store
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_sudo "to make the basic directory structure of Nix (part 3)" \
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chgrp "$NIX_BUILD_GROUP_NAME" /nix/store
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_sudo "to place the default nix daemon configuration (part 1)" \
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mkdir -pv -m 0555 /etc/nix
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}
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place_channel_configuration() {
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echo "https://nixos.org/channels/nixpkgs-unstable nixpkgs" > "$SCRATCH/.nix-channels"
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_sudo "to set up the default system channel (part 1)" \
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install -m 0664 "$SCRATCH/.nix-channels" "$ROOT_HOME/.nix-channels"
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}
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welcome_to_nix() {
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ok "Welcome to the Multi-User Nix Installation"
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cat <<EOF
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This installation tool will set up your computer with the Nix package
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manager. This will happen in a few stages:
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1. Make sure your computer doesn't already have Nix. If it does, I
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will show you instructions on how to clean up your old one.
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2. Show you what we are going to install and where. Then we will ask
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if you are ready to continue.
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3. Create the system users and groups that the Nix daemon uses to run
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builds.
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4. Perform the basic installation of the Nix files daemon.
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5. Configure your shell to import special Nix Profile files, so you
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can use Nix.
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6. Start the Nix daemon.
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EOF
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if ui_confirm "Would you like to see a more detailed list of what we will do?"; then
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cat <<EOF
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We will:
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- make sure your computer doesn't already have Nix files
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(if it does, I will tell you how to clean them up.)
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- create local users (see the list above for the users we'll make)
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- create a local group ($NIX_BUILD_GROUP_NAME)
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- install Nix in to $NIX_ROOT
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- create a configuration file in /etc/nix
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- set up the "default profile" by creating some Nix-related files in
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$ROOT_HOME
|
|
EOF
|
|
for profile_target in "${PROFILE_TARGETS[@]}"; do
|
|
if [ -e "$profile_target" ]; then
|
|
cat <<EOF
|
|
- back up $profile_target to $profile_target$PROFILE_BACKUP_SUFFIX
|
|
- update $profile_target to include some Nix configuration
|
|
EOF
|
|
fi
|
|
done
|
|
poly_service_setup_note
|
|
if ! ui_confirm "Ready to continue?"; then
|
|
failure <<EOF
|
|
Okay, maybe you would like to talk to the team.
|
|
EOF
|
|
fi
|
|
fi
|
|
}
|
|
|
|
chat_about_sudo() {
|
|
header "let's talk about sudo"
|
|
|
|
if headless; then
|
|
cat <<EOF
|
|
This script is going to call sudo a lot. Normally, it would show you
|
|
exactly what commands it is running and why. However, the script is
|
|
run in a headless fashion, like this:
|
|
|
|
$ curl https://nixos.org/nix/install | sh
|
|
|
|
or maybe in a CI pipeline. Because of that, we're going to skip the
|
|
verbose output in the interest of brevity.
|
|
|
|
If you would like to
|
|
see the output, try like this:
|
|
|
|
$ curl -o install-nix https://nixos.org/nix/install
|
|
$ sh ./install-nix
|
|
|
|
EOF
|
|
return 0
|
|
fi
|
|
|
|
cat <<EOF
|
|
This script is going to call sudo a lot. Every time we do, it'll
|
|
output exactly what it'll do, and why.
|
|
|
|
Just like this:
|
|
EOF
|
|
|
|
__sudo "to demonstrate how our sudo prompts look" \
|
|
echo "this is a sudo prompt"
|
|
|
|
cat <<EOF
|
|
|
|
This might look scary, but everything can be undone by running just a
|
|
few commands. We used to ask you to confirm each time sudo ran, but it
|
|
was too many times. Instead, I'll just ask you this one time:
|
|
|
|
EOF
|
|
if ui_confirm "Can we use sudo?"; then
|
|
ok "Yay! Thanks! Let's get going!"
|
|
else
|
|
failure <<EOF
|
|
That is okay, but we can't install.
|
|
EOF
|
|
fi
|
|
}
|
|
|
|
install_from_extracted_nix() {
|
|
(
|
|
cd "$EXTRACTED_NIX_PATH"
|
|
|
|
_sudo "to copy the basic Nix files to the new store at $NIX_ROOT/store" \
|
|
rsync -rlpt --chmod=-w ./store/* "$NIX_ROOT/store/"
|
|
|
|
if [ -d "$NIX_INSTALLED_NIX" ]; then
|
|
echo " Alright! We have our first nix at $NIX_INSTALLED_NIX"
|
|
else
|
|
failure <<EOF
|
|
Something went wrong, and I didn't find Nix installed at
|
|
$NIX_INSTALLED_NIX.
|
|
EOF
|
|
fi
|
|
|
|
cat ./.reginfo \
|
|
| _sudo "to load data for the first time in to the Nix Database" \
|
|
"$NIX_INSTALLED_NIX/bin/nix-store" --load-db
|
|
|
|
echo " Just finished getting the nix database ready."
|
|
)
|
|
}
|
|
|
|
shell_source_lines() {
|
|
cat <<EOF
|
|
|
|
# Nix
|
|
if [ -e '$PROFILE_NIX_FILE' ]; then
|
|
. '$PROFILE_NIX_FILE'
|
|
fi
|
|
# End Nix
|
|
|
|
EOF
|
|
}
|
|
|
|
configure_shell_profile() {
|
|
# If there is an /etc/profile.d directory, we want to ensure there
|
|
# is a nix.sh within it, so we can use the following loop to add
|
|
# the source lines to it. Note that I'm _not_ adding the source
|
|
# lines here, because we want to be using the regular machinery.
|
|
#
|
|
# If we go around that machinery, it becomes more complicated and
|
|
# adds complications to the uninstall instruction generator and
|
|
# old instruction sniffer as well.
|
|
if [ -d /etc/profile.d ]; then
|
|
_sudo "create a stub /etc/profile.d/nix.sh which will be updated" \
|
|
touch /etc/profile.d/nix.sh
|
|
fi
|
|
|
|
for profile_target in "${PROFILE_TARGETS[@]}"; do
|
|
if [ -e "$profile_target" ]; then
|
|
_sudo "to back up your current $profile_target to $profile_target$PROFILE_BACKUP_SUFFIX" \
|
|
cp "$profile_target" "$profile_target$PROFILE_BACKUP_SUFFIX"
|
|
|
|
shell_source_lines \
|
|
| _sudo "extend your $profile_target with nix-daemon settings" \
|
|
tee -a "$profile_target"
|
|
fi
|
|
done
|
|
}
|
|
|
|
setup_default_profile() {
|
|
_sudo "to installing a bootstrapping Nix in to the default Profile" \
|
|
HOME="$ROOT_HOME" "$NIX_INSTALLED_NIX/bin/nix-env" -i "$NIX_INSTALLED_NIX"
|
|
|
|
if [ -z "${NIX_SSL_CERT_FILE:-}" ] || ! [ -f "${NIX_SSL_CERT_FILE:-}" ]; then
|
|
_sudo "to installing a bootstrapping SSL certificate just for Nix in to the default Profile" \
|
|
HOME="$ROOT_HOME" "$NIX_INSTALLED_NIX/bin/nix-env" -i "$NIX_INSTALLED_CACERT"
|
|
export NIX_SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
|
|
fi
|
|
|
|
# Have to explicitly pass NIX_SSL_CERT_FILE as part of the sudo call,
|
|
# otherwise it will be lost in environments where sudo doesn't pass
|
|
# all the environment variables by default.
|
|
_sudo "to update the default channel in the default profile" \
|
|
HOME="$ROOT_HOME" NIX_SSL_CERT_FILE="$NIX_SSL_CERT_FILE" "$NIX_INSTALLED_NIX/bin/nix-channel" --update nixpkgs \
|
|
|| channel_update_failed=1
|
|
|
|
}
|
|
|
|
|
|
place_nix_configuration() {
|
|
cat <<EOF > "$SCRATCH/nix.conf"
|
|
build-users-group = $NIX_BUILD_GROUP_NAME
|
|
EOF
|
|
_sudo "to place the default nix daemon configuration (part 2)" \
|
|
install -m 0664 "$SCRATCH/nix.conf" /etc/nix/nix.conf
|
|
}
|
|
|
|
main() {
|
|
if [ "$(uname -s)" = "Darwin" ]; then
|
|
# shellcheck source=./install-darwin-multi-user.sh
|
|
. "$EXTRACTED_NIX_PATH/install-darwin-multi-user.sh"
|
|
elif [ "$(uname -s)" = "Linux" ]; then
|
|
if [ -e /run/systemd/system ]; then
|
|
# shellcheck source=./install-systemd-multi-user.sh
|
|
. "$EXTRACTED_NIX_PATH/install-systemd-multi-user.sh"
|
|
else
|
|
failure "Sorry, the multi-user installation requires systemd on Linux (detected using /run/systemd/system)"
|
|
fi
|
|
else
|
|
failure "Sorry, I don't know what to do on $(uname)"
|
|
fi
|
|
|
|
welcome_to_nix
|
|
chat_about_sudo
|
|
|
|
validate_starting_assumptions
|
|
|
|
setup_report
|
|
|
|
if ! ui_confirm "Ready to continue?"; then
|
|
ok "Alright, no changes have been made :)"
|
|
contactme
|
|
trap finish_cleanup EXIT
|
|
exit 1
|
|
fi
|
|
|
|
create_build_group
|
|
create_build_users
|
|
create_directories
|
|
place_channel_configuration
|
|
install_from_extracted_nix
|
|
|
|
configure_shell_profile
|
|
|
|
set +eu
|
|
. /etc/profile
|
|
set -eu
|
|
|
|
setup_default_profile
|
|
place_nix_configuration
|
|
poly_configure_nix_daemon_service
|
|
|
|
trap finish_success EXIT
|
|
}
|
|
|
|
|
|
main
|