mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-12-01 18:16:14 +02:00
ba9a8c4b3d
Same as 1fd127a068, but applied to a
code path (volume_pass_works -> verify_volume_pass) that the reporting
user didn't hit and wasn't able to trigger manually. I am not certain
but I suspect it will be easier to add prophylactically than to debug
if its absence causes trouble some day.
868 lines
32 KiB
Bash
Executable file
868 lines
32 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -eu
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set -o pipefail
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# I'm a little agnostic on the choices, but supporting a wide
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# slate of uses for now, including:
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# - import-only: `. create-darwin-volume.sh no-main[ ...]`
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# - legacy: `./create-darwin-volume.sh` or `. create-darwin-volume.sh`
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# (both will run main())
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# - external alt-routine: `./create-darwin-volume.sh no-main func[ ...]`
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if [ "${1-}" = "no-main" ]; then
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shift
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readonly _CREATE_VOLUME_NO_MAIN=1
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else
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readonly _CREATE_VOLUME_NO_MAIN=0
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# declare some things we expect to inherit from install-multi-user
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# I don't love this (because it's a bit of a kludge).
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#
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# CAUTION: (Dec 19 2020)
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# This is a stopgap. It doesn't cover the full slate of
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# identifiers we inherit--just those necessary to:
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# - avoid breaking direct invocations of this script (here/now)
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# - avoid hard-to-reverse structural changes before the call to rm
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# single-user support is verified
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#
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# In the near-mid term, I (personally) think we should:
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# - decide to deprecate the direct call and add a notice
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# - fold all of this into install-darwin-multi-user.sh
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# - intentionally remove the old direct-invocation form (kill the
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# routine, replace this script w/ deprecation notice and a note
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# on the remove-after date)
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#
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readonly NIX_ROOT="${NIX_ROOT:-/nix}"
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_sudo() {
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shift # throw away the 'explanation'
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/usr/bin/sudo "$@"
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}
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failure() {
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if [ "$*" = "" ]; then
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cat
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else
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echo "$@"
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fi
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exit 1
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}
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task() {
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echo "$@"
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}
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fi
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# usually "disk1"
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root_disk_identifier() {
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# For performance (~10ms vs 280ms) I'm parsing 'diskX' from stat output
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# (~diskXsY)--but I'm retaining the more-semantic approach since
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# it documents intent better.
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# /usr/sbin/diskutil info -plist / | xmllint --xpath "/plist/dict/key[text()='ParentWholeDisk']/following-sibling::string[1]/text()" -
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#
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local special_device
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special_device="$(/usr/bin/stat -f "%Sd" /)"
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echo "${special_device%s[0-9]*}"
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}
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# make it easy to play w/ 'Case-sensitive APFS'
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readonly NIX_VOLUME_FS="${NIX_VOLUME_FS:-APFS}"
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readonly NIX_VOLUME_LABEL="${NIX_VOLUME_LABEL:-Nix Store}"
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# Strongly assuming we'll make a volume on the device / is on
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# But you can override NIX_VOLUME_USE_DISK to create it on some other device
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readonly NIX_VOLUME_USE_DISK="${NIX_VOLUME_USE_DISK:-$(root_disk_identifier)}"
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NIX_VOLUME_USE_SPECIAL="${NIX_VOLUME_USE_SPECIAL:-}"
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NIX_VOLUME_USE_UUID="${NIX_VOLUME_USE_UUID:-}"
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readonly NIX_VOLUME_MOUNTD_DEST="${NIX_VOLUME_MOUNTD_DEST:-/Library/LaunchDaemons/org.nixos.darwin-store.plist}"
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if /usr/bin/fdesetup isactive >/dev/null; then
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test_filevault_in_use() { return 0; }
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# no readonly; we may modify if user refuses from cure_volume
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NIX_VOLUME_DO_ENCRYPT="${NIX_VOLUME_DO_ENCRYPT:-1}"
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else
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test_filevault_in_use() { return 1; }
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NIX_VOLUME_DO_ENCRYPT="${NIX_VOLUME_DO_ENCRYPT:-0}"
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fi
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should_encrypt_volume() {
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test_filevault_in_use && (( NIX_VOLUME_DO_ENCRYPT == 1 ))
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}
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substep() {
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printf " %s\n" "" "- $1" "" "${@:2}"
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}
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volumes_labeled() {
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local label="$1"
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xsltproc --novalid --stringparam label "$label" - <(/usr/sbin/ioreg -ra -c "AppleAPFSVolume") <<'EOF'
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
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<xsl:output method="text"/>
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<xsl:template match="/">
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<xsl:apply-templates select="/plist/array/dict/key[text()='IORegistryEntryName']/following-sibling::*[1][text()=$label]/.."/>
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</xsl:template>
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<xsl:template match="dict">
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<xsl:apply-templates match="string" select="key[text()='BSD Name']/following-sibling::*[1]"/>
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<xsl:text>=</xsl:text>
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<xsl:apply-templates match="string" select="key[text()='UUID']/following-sibling::*[1]"/>
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<xsl:text>
</xsl:text>
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</xsl:template>
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</xsl:stylesheet>
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EOF
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# I cut label out of the extracted values, but here it is for reference:
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# <xsl:apply-templates match="string" select="key[text()='IORegistryEntryName']/following-sibling::*[1]"/>
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# <xsl:text>=</xsl:text>
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}
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right_disk() {
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local volume_special="$1" # (i.e., disk1s7)
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[[ "$volume_special" == "$NIX_VOLUME_USE_DISK"s* ]]
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}
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right_volume() {
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local volume_special="$1" # (i.e., disk1s7)
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# if set, it must match; otherwise ensure it's on the right disk
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if [ -z "$NIX_VOLUME_USE_SPECIAL" ]; then
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if right_disk "$volume_special"; then
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NIX_VOLUME_USE_SPECIAL="$volume_special" # latch on
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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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else
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[ "$volume_special" = "$NIX_VOLUME_USE_SPECIAL" ]
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fi
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}
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right_uuid() {
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local volume_uuid="$1"
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# if set, it must match; otherwise allow
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if [ -z "$NIX_VOLUME_USE_UUID" ]; then
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NIX_VOLUME_USE_UUID="$volume_uuid" # latch on
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return 0
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else
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[ "$volume_uuid" = "$NIX_VOLUME_USE_UUID" ]
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fi
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}
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cure_volumes() {
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local found volume special uuid
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# loop just in case they have more than one volume
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# (nothing stops you from doing this)
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for volume in $(volumes_labeled "$NIX_VOLUME_LABEL"); do
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# CAUTION: this could (maybe) be a more normal read
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# loop like:
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# while IFS== read -r special uuid; do
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# # ...
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# done <<<"$(volumes_labeled "$NIX_VOLUME_LABEL")"
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#
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# I did it with for to skirt a problem with the obvious
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# pattern replacing stdin and causing user prompts
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# inside (which also use read and access stdin) to skip
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#
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# If there's an existing encrypted volume we can't find
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# in keychain, the user never gets prompted to delete
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# the volume, and the install fails.
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#
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# If you change this, a human needs to test a very
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# specific scenario: you already have an encrypted
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# Nix Store volume, and have deleted its credential
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# from keychain. Ensure the script asks you if it can
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# delete the volume, and then prompts for your sudo
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# password to confirm.
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#
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# shellcheck disable=SC1097
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IFS== read -r special uuid <<< "$volume"
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# take the first one that's on the right disk
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if [ -z "${found:-}" ]; then
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if right_volume "$special" && right_uuid "$uuid"; then
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cure_volume "$special" "$uuid"
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found="${special} (${uuid})"
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else
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warning <<EOF
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Ignoring ${special} (${uuid}) because I am looking for:
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disk=${NIX_VOLUME_USE_DISK} special=${NIX_VOLUME_USE_SPECIAL:-${NIX_VOLUME_USE_DISK}sX} uuid=${NIX_VOLUME_USE_UUID:-any}
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EOF
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# TODO: give chance to delete if ! headless?
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fi
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else
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warning <<EOF
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Ignoring ${special} (${uuid}), already found target: $found
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EOF
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# TODO reminder? I feel like I want one
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# idiom that reminds some warnings, or warns
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# some reminders?
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# TODO: if ! headless, chance to delete?
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fi
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done
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if [ -z "${found:-}" ]; then
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readonly NIX_VOLUME_USE_SPECIAL NIX_VOLUME_USE_UUID
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fi
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}
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volume_encrypted() {
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local volume_special="$1" # (i.e., disk1s7)
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# Trying to match the first line of output; known first lines:
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# No cryptographic users for <special>
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# Cryptographic user for <special> (1 found)
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# Cryptographic users for <special> (2 found)
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/usr/sbin/diskutil apfs listCryptoUsers -plist "$volume_special" | /usr/bin/grep -q APFSCryptoUserUUID
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}
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test_fstab() {
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/usr/bin/grep -q "$NIX_ROOT apfs rw" /etc/fstab 2>/dev/null
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}
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test_nix_root_is_symlink() {
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[ -L "$NIX_ROOT" ]
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}
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test_synthetic_conf_either(){
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/usr/bin/grep -qE "^${NIX_ROOT:1}($|\t.{3,}$)" /etc/synthetic.conf 2>/dev/null
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}
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test_synthetic_conf_mountable() {
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/usr/bin/grep -q "^${NIX_ROOT:1}$" /etc/synthetic.conf 2>/dev/null
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}
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test_synthetic_conf_symlinked() {
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/usr/bin/grep -qE "^${NIX_ROOT:1}\t.{3,}$" /etc/synthetic.conf 2>/dev/null
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}
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test_nix_volume_mountd_installed() {
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test -e "$NIX_VOLUME_MOUNTD_DEST"
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}
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# current volume password
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test_keychain_by_uuid() {
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local volume_uuid="$1"
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# Note: doesn't need sudo just to check; doesn't output pw
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security find-generic-password -s "$volume_uuid" &>/dev/null
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}
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get_volume_pass() {
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local volume_uuid="$1"
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_sudo \
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"to confirm keychain has a password that unlocks this volume" \
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security find-generic-password -s "$volume_uuid" -w
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}
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verify_volume_pass() {
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local volume_special="$1" # (i.e., disk1s7)
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local volume_uuid="$2"
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_sudo "to confirm the password actually unlocks the volume" \
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/usr/sbin/diskutil apfs unlockVolume "$volume_special" -verify -stdinpassphrase -user "$volume_uuid"
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}
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volume_pass_works() {
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local volume_special="$1" # (i.e., disk1s7)
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local volume_uuid="$2"
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get_volume_pass "$volume_uuid" | verify_volume_pass "$volume_special" "$volume_uuid"
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}
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# Create the paths defined in synthetic.conf, saving us a reboot.
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create_synthetic_objects() {
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# Big Sur takes away the -B flag we were using and replaces it
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# with a -t flag that appears to do the same thing (but they
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# don't behave exactly the same way in terms of return values).
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# This feels a little dirty, but as far as I can tell the
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# simplest way to get the right one is to just throw away stderr
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# and call both... :]
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{
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/System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util -t || true # Big Sur
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/System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util -B || true # Catalina
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} >/dev/null 2>&1
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}
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test_nix() {
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test -d "$NIX_ROOT"
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}
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test_voldaemon() {
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test -f "$NIX_VOLUME_MOUNTD_DEST"
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}
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generate_mount_command() {
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local cmd_type="$1" # encrypted|unencrypted
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local volume_uuid mountpoint cmd=()
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printf -v volume_uuid "%q" "$2"
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printf -v mountpoint "%q" "$NIX_ROOT"
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case "$cmd_type" in
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encrypted)
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cmd=(/bin/sh -c "/usr/bin/security find-generic-password -s '$volume_uuid' -w | /usr/sbin/diskutil apfs unlockVolume '$volume_uuid' -mountpoint '$mountpoint' -stdinpassphrase");;
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unencrypted)
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cmd=(/usr/sbin/diskutil mount -mountPoint "$mountpoint" "$volume_uuid");;
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*)
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failure "Invalid first arg $cmd_type to generate_mount_command";;
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esac
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printf " <string>%s</string>\n" "${cmd[@]}"
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}
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generate_mount_daemon() {
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local cmd_type="$1" # encrypted|unencrypted
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local volume_uuid="$2"
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cat <<EOF
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>RunAtLoad</key>
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<true/>
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<key>Label</key>
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<string>org.nixos.darwin-store</string>
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<key>ProgramArguments</key>
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<array>
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$(generate_mount_command "$cmd_type" "$volume_uuid")
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</array>
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</dict>
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</plist>
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EOF
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}
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_eat_bootout_err() {
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/usr/bin/grep -v "Boot-out failed: 36: Operation now in progress"
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}
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# TODO: remove with --uninstall?
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uninstall_launch_daemon_directions() {
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local daemon_label="$1" # i.e., org.nixos.blah-blah
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local daemon_plist="$2" # abspath
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substep "Uninstall LaunchDaemon $daemon_label" \
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" sudo launchctl bootout system/$daemon_label" \
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" sudo rm $daemon_plist"
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}
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uninstall_launch_daemon_prompt() {
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local daemon_label="$1" # i.e., org.nixos.blah-blah
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local daemon_plist="$2" # abspath
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local reason_for_daemon="$3"
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cat <<EOF
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The installer adds a LaunchDaemon to $reason_for_daemon: $daemon_label
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EOF
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if ui_confirm "Can I remove it?"; then
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_sudo "to terminate the daemon" \
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launchctl bootout "system/$daemon_label" 2> >(_eat_bootout_err >&2) || true
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# this can "fail" with a message like:
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# Boot-out failed: 36: Operation now in progress
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_sudo "to remove the daemon definition" rm "$daemon_plist"
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fi
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}
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nix_volume_mountd_uninstall_directions() {
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uninstall_launch_daemon_directions "org.nixos.darwin-store" \
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"$NIX_VOLUME_MOUNTD_DEST"
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}
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nix_volume_mountd_uninstall_prompt() {
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uninstall_launch_daemon_prompt "org.nixos.darwin-store" \
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"$NIX_VOLUME_MOUNTD_DEST" \
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"mount your Nix volume"
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}
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# TODO: move nix_daemon to install-darwin-multi-user if/when uninstall_launch_daemon_prompt moves up to install-multi-user
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nix_daemon_uninstall_prompt() {
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uninstall_launch_daemon_prompt "org.nixos.nix-daemon" \
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"$NIX_DAEMON_DEST" \
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"run the nix-daemon"
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}
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# TODO: remove with --uninstall?
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nix_daemon_uninstall_directions() {
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uninstall_launch_daemon_directions "org.nixos.nix-daemon" \
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"$NIX_DAEMON_DEST"
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}
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# TODO: remove with --uninstall?
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synthetic_conf_uninstall_directions() {
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# :1 to strip leading slash
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substep "Remove ${NIX_ROOT:1} from /etc/synthetic.conf" \
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" If nix is the only entry: sudo rm /etc/synthetic.conf" \
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" Otherwise: sudo /usr/bin/sed -i '' -e '/^${NIX_ROOT:1}$/d' /etc/synthetic.conf"
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}
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synthetic_conf_uninstall_prompt() {
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cat <<EOF
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During install, I add '${NIX_ROOT:1}' to /etc/synthetic.conf, which instructs
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macOS to create an empty root directory for mounting the Nix volume.
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EOF
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# make the edit to a copy
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/usr/bin/grep -vE "^${NIX_ROOT:1}($|\t.{3,}$)" /etc/synthetic.conf > "$SCRATCH/synthetic.conf.edit"
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if test_synthetic_conf_symlinked; then
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warning <<EOF
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/etc/synthetic.conf already contains a line instructing your system
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to make '${NIX_ROOT}' as a symlink:
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$(/usr/bin/grep -nE "^${NIX_ROOT:1}\t.{3,}$" /etc/synthetic.conf)
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This may mean your system has/had a non-standard Nix install.
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The volume-creation process in this installer is *not* compatible
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with a symlinked store, so I'll have to remove this instruction to
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continue.
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If you want/need to keep this instruction, answer 'n' to abort.
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EOF
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fi
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# ask to rm if this left the file empty aside from comments, else edit
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if /usr/bin/diff -q <(:) <(/usr/bin/grep -v "^#" "$SCRATCH/synthetic.conf.edit") &>/dev/null; then
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if confirm_rm "/etc/synthetic.conf"; then
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if test_nix_root_is_symlink; then
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failure >&2 <<EOF
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I removed /etc/synthetic.conf, but $NIX_ROOT is already a symlink
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(-> $(readlink "$NIX_ROOT")). The system should remove it when you reboot.
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Once you've rebooted, run the installer again.
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EOF
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fi
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return 0
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fi
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else
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if confirm_edit "$SCRATCH/synthetic.conf.edit" "/etc/synthetic.conf"; then
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if test_nix_root_is_symlink; then
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failure >&2 <<EOF
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I edited Nix out of /etc/synthetic.conf, but $NIX_ROOT is already a symlink
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(-> $(readlink "$NIX_ROOT")). The system should remove it when you reboot.
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Once you've rebooted, run the installer again.
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EOF
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fi
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return 0
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fi
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fi
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# fallback instructions
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echo "Manually remove nix from /etc/synthetic.conf"
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return 1
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}
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add_nix_vol_fstab_line() {
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local uuid="$1"
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# shellcheck disable=SC1003,SC2026
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local escaped_mountpoint="${NIX_ROOT/ /'\\\'040}"
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shift
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# wrap `ex` to work around a problem with vim plugins breaking exit codes;
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# (see https://github.com/NixOS/nix/issues/5468)
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# we'd prefer EDITOR="/usr/bin/ex --noplugin" but vifs doesn't word-split
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# the EDITOR env.
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#
|
|
# TODO: at some point we should switch to `--clean`, but it wasn't added
|
|
# until https://github.com/vim/vim/releases/tag/v8.0.1554 while the macOS
|
|
# minver 10.12.6 seems to have released with vim 7.4
|
|
cat > "$SCRATCH/ex_cleanroom_wrapper" <<EOF
|
|
#!/bin/sh
|
|
/usr/bin/ex --noplugin "\$@"
|
|
EOF
|
|
chmod 755 "$SCRATCH/ex_cleanroom_wrapper"
|
|
|
|
EDITOR="$SCRATCH/ex_cleanroom_wrapper" _sudo "to add nix to fstab" "$@" <<EOF
|
|
:a
|
|
UUID=$uuid $escaped_mountpoint apfs rw,noauto,nobrowse,suid,owners
|
|
.
|
|
:x
|
|
EOF
|
|
# TODO: preserving my notes on suid,owners above until resolved
|
|
# There *may* be some issue regarding volume ownership, see nix#3156
|
|
#
|
|
# It seems like the cheapest fix is adding "suid,owners" to fstab, but:
|
|
# - We don't have much info on this condition yet
|
|
# - I'm not certain if these cause other problems?
|
|
# - There's a "chown" component some people claim to need to fix this
|
|
# that I don't understand yet
|
|
# (Note however that I've had to add a chown step to handle
|
|
# single->multi-user reinstalls, which may cover this)
|
|
#
|
|
# I'm not sure if it's safe to approach this way?
|
|
#
|
|
# I think I think the most-proper way to test for it is:
|
|
# diskutil info -plist "$NIX_VOLUME_LABEL" | xmllint --xpath "(/plist/dict/key[text()='GlobalPermissionsEnabled'])/following-sibling::*[1][name()='true']" -; echo $?
|
|
#
|
|
# There's also `sudo /usr/sbin/vsdbutil -c /path` (which is much faster, but is also
|
|
# deprecated and needs minor parsing).
|
|
#
|
|
# If no one finds a problem with doing so, I think the simplest approach
|
|
# is to just eagerly set this. I found a few imperative approaches:
|
|
# (diskutil enableOwnership, ~100ms), a cheap one (/usr/sbin/vsdbutil -a, ~40-50ms),
|
|
# a very cheap one (append the internal format to /var/db/volinfo.database).
|
|
#
|
|
# But vsdbutil's deprecation notice suggests using fstab, so I want to
|
|
# give that a whirl first.
|
|
#
|
|
# TODO: when this is workable, poke infinisil about reproducing the issue
|
|
# and confirming this fix?
|
|
}
|
|
|
|
delete_nix_vol_fstab_line() {
|
|
# TODO: I'm scaffolding this to handle the new nix volumes
|
|
# but it might be nice to generalize a smidge further to
|
|
# go ahead and set up a pattern for curing "old" things
|
|
# we no longer do?
|
|
EDITOR="/usr/bin/patch" _sudo "to cut nix from fstab" "$@" < <(/usr/bin/diff /etc/fstab <(/usr/bin/grep -v "$NIX_ROOT apfs rw" /etc/fstab))
|
|
# leaving some parts out of the grep; people may fiddle this a little?
|
|
}
|
|
|
|
# TODO: hope to remove with --uninstall
|
|
fstab_uninstall_directions() {
|
|
substep "Remove ${NIX_ROOT} from /etc/fstab" \
|
|
" If nix is the only entry: sudo rm /etc/fstab" \
|
|
" Otherwise, run 'sudo /usr/sbin/vifs' to remove the nix line"
|
|
}
|
|
|
|
fstab_uninstall_prompt() {
|
|
cat <<EOF
|
|
During install, I add '${NIX_ROOT}' to /etc/fstab so that macOS knows what
|
|
mount options to use for the Nix volume.
|
|
EOF
|
|
cp /etc/fstab "$SCRATCH/fstab.edit"
|
|
# technically doesn't need the _sudo path, but throwing away the
|
|
# output is probably better than mostly-duplicating the code...
|
|
delete_nix_vol_fstab_line patch "$SCRATCH/fstab.edit" &>/dev/null
|
|
|
|
# if the patch test edit, minus comment lines, is equal to empty (:)
|
|
if /usr/bin/diff -q <(:) <(/usr/bin/grep -v "^#" "$SCRATCH/fstab.edit") &>/dev/null; then
|
|
# this edit would leave it empty; propose deleting it
|
|
if confirm_rm "/etc/fstab"; then
|
|
return 0
|
|
else
|
|
echo "Remove nix from /etc/fstab (or remove the file)"
|
|
fi
|
|
else
|
|
echo "I might be able to help you make this edit. Here's the diff:"
|
|
if ! _diff "/etc/fstab" "$SCRATCH/fstab.edit" && ui_confirm "Does the change above look right?"; then
|
|
delete_nix_vol_fstab_line /usr/sbin/vifs
|
|
else
|
|
echo "Remove nix from /etc/fstab (or remove the file)"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
remove_volume() {
|
|
local volume_special="$1" # (i.e., disk1s7)
|
|
_sudo "to unmount the Nix volume" \
|
|
/usr/sbin/diskutil unmount force "$volume_special" || true # might not be mounted
|
|
_sudo "to delete the Nix volume" \
|
|
/usr/sbin/diskutil apfs deleteVolume "$volume_special"
|
|
}
|
|
|
|
# aspiration: robust enough to both fix problems
|
|
# *and* update older darwin volumes
|
|
cure_volume() {
|
|
local volume_special="$1" # (i.e., disk1s7)
|
|
local volume_uuid="$2"
|
|
header "Found existing Nix volume"
|
|
row " special" "$volume_special"
|
|
row " uuid" "$volume_uuid"
|
|
|
|
if volume_encrypted "$volume_special"; then
|
|
row "encrypted" "yes"
|
|
if volume_pass_works "$volume_special" "$volume_uuid"; then
|
|
NIX_VOLUME_DO_ENCRYPT=0
|
|
ok "Found a working decryption password in keychain :)"
|
|
echo ""
|
|
else
|
|
# - this is a volume we made, and
|
|
# - the user encrypted it on their own
|
|
# - something deleted the credential
|
|
# - this is an old or BYO volume and the pw
|
|
# just isn't somewhere we can find it.
|
|
#
|
|
# We're going to explain why we're freaking out
|
|
# and prompt them to either delete the volume
|
|
# (requiring a sudo auth), or abort to fix
|
|
warning <<EOF
|
|
|
|
This volume is encrypted, but I don't see a password to decrypt it.
|
|
The quick fix is to let me delete this volume and make you a new one.
|
|
If that's okay, enter your (sudo) password to continue. If not, you
|
|
can ensure the decryption password is in your system keychain with a
|
|
"Where" (service) field set to this volume's UUID:
|
|
$volume_uuid
|
|
EOF
|
|
if password_confirm "delete this volume"; then
|
|
remove_volume "$volume_special"
|
|
else
|
|
# TODO: this is a good design case for a warn-and
|
|
# remind idiom...
|
|
failure <<EOF
|
|
Your Nix volume is encrypted, but I couldn't find its password. Either:
|
|
- Delete or rename the volume out of the way
|
|
- Ensure its decryption password is in the system keychain with a
|
|
"Where" (service) field set to this volume's UUID:
|
|
$volume_uuid
|
|
EOF
|
|
fi
|
|
fi
|
|
elif test_filevault_in_use; then
|
|
row "encrypted" "no"
|
|
warning <<EOF
|
|
FileVault is on, but your $NIX_VOLUME_LABEL volume isn't encrypted.
|
|
EOF
|
|
# if we're interactive, give them a chance to
|
|
# encrypt the volume. If not, /shrug
|
|
if ! headless && (( NIX_VOLUME_DO_ENCRYPT == 1 )); then
|
|
if ui_confirm "Should I encrypt it and add the decryption key to your keychain?"; then
|
|
encrypt_volume "$volume_uuid" "$NIX_VOLUME_LABEL"
|
|
NIX_VOLUME_DO_ENCRYPT=0
|
|
else
|
|
NIX_VOLUME_DO_ENCRYPT=0
|
|
reminder "FileVault is on, but your $NIX_VOLUME_LABEL volume isn't encrypted."
|
|
fi
|
|
fi
|
|
else
|
|
row "encrypted" "no"
|
|
fi
|
|
}
|
|
|
|
remove_volume_artifacts() {
|
|
if test_synthetic_conf_either; then
|
|
# NIX_ROOT is in synthetic.conf
|
|
if synthetic_conf_uninstall_prompt; then
|
|
# TODO: moot until we tackle uninstall, but when we're
|
|
# actually uninstalling, we should issue:
|
|
# reminder "macOS will clean up the empty mount-point directory at $NIX_ROOT on reboot."
|
|
:
|
|
fi
|
|
fi
|
|
if test_fstab; then
|
|
fstab_uninstall_prompt
|
|
fi
|
|
|
|
if test_nix_volume_mountd_installed; then
|
|
nix_volume_mountd_uninstall_prompt
|
|
fi
|
|
}
|
|
|
|
setup_synthetic_conf() {
|
|
if test_nix_root_is_symlink; then
|
|
if ! test_synthetic_conf_symlinked; then
|
|
failure >&2 <<EOF
|
|
error: $NIX_ROOT is a symlink (-> $(readlink "$NIX_ROOT")).
|
|
Please remove it. If nix is in /etc/synthetic.conf, remove it and reboot.
|
|
EOF
|
|
fi
|
|
fi
|
|
if ! test_synthetic_conf_mountable; then
|
|
task "Configuring /etc/synthetic.conf to make a mount-point at $NIX_ROOT" >&2
|
|
# technically /etc/synthetic.d/nix is supported in Big Sur+
|
|
# but handling both takes even more code...
|
|
_sudo "to add Nix to /etc/synthetic.conf" \
|
|
/usr/bin/ex --noplugin /etc/synthetic.conf <<EOF
|
|
:a
|
|
${NIX_ROOT:1}
|
|
.
|
|
:x
|
|
EOF
|
|
if ! test_synthetic_conf_mountable; then
|
|
failure "error: failed to configure synthetic.conf" >&2
|
|
fi
|
|
create_synthetic_objects
|
|
if ! test_nix; then
|
|
failure >&2 <<EOF
|
|
error: failed to bootstrap $NIX_ROOT
|
|
If you enabled FileVault after booting, this is likely a known issue
|
|
with macOS that you'll have to reboot to fix. If you didn't enable FV,
|
|
though, please open an issue describing how the system that you see
|
|
this error on was set up.
|
|
EOF
|
|
fi
|
|
fi
|
|
}
|
|
|
|
setup_fstab() {
|
|
local volume_uuid="$1"
|
|
# fstab used to be responsible for mounting the volume. Now the last
|
|
# step adds a LaunchDaemon responsible for mounting. This is technically
|
|
# redundant for mounting, but diskutil appears to pick up mount options
|
|
# from fstab (and diskutil's support for specifying them directly is not
|
|
# consistent across versions/subcommands).
|
|
if ! test_fstab; then
|
|
task "Configuring /etc/fstab to specify volume mount options" >&2
|
|
add_nix_vol_fstab_line "$volume_uuid" /usr/sbin/vifs
|
|
fi
|
|
}
|
|
|
|
encrypt_volume() {
|
|
local volume_uuid="$1"
|
|
local volume_label="$2"
|
|
local password
|
|
|
|
task "Encrypt the Nix volume" >&2
|
|
|
|
# Note: mount/unmount are late additions to support the right order
|
|
# of operations for creating the volume and then baking its uuid into
|
|
# other artifacts; not as well-trod wrt to potential errors, race
|
|
# conditions, etc.
|
|
|
|
_sudo "to mount your Nix volume for encrypting" \
|
|
/usr/sbin/diskutil mount "$volume_label"
|
|
|
|
password="$(/usr/bin/xxd -l 32 -p -c 256 /dev/random)"
|
|
_sudo "to add your Nix volume's password to Keychain" \
|
|
/usr/bin/security -i <<EOF
|
|
add-generic-password -a "$volume_label" -s "$volume_uuid" -l "$volume_label encryption password" -D "Encrypted volume password" -j "Added automatically by the Nix installer for use by $NIX_VOLUME_MOUNTD_DEST" -w "$password" -T /System/Library/CoreServices/APFSUserAgent -T /System/Library/CoreServices/CSUserAgent -T /usr/bin/security "/Library/Keychains/System.keychain"
|
|
EOF
|
|
builtin printf "%s" "$password" | _sudo "to actually encrypt your Nix volume" \
|
|
/usr/sbin/diskutil apfs encryptVolume "$volume_label" -user disk -stdinpassphrase
|
|
|
|
_sudo "to unmount the encrypted volume" \
|
|
/usr/sbin/diskutil unmount force "$volume_label"
|
|
}
|
|
|
|
create_volume() {
|
|
# Notes:
|
|
# 1) using `-nomount` instead of `-mountpoint "$NIX_ROOT"` to get
|
|
# its UUID and set mount opts in fstab before first mount
|
|
#
|
|
# 2) system is in some sense less secure than user keychain... (it's
|
|
# possible to read the password for decrypting the keychain) but
|
|
# the user keychain appears to be available too late. As far as I
|
|
# can tell, the file with this password (/var/db/SystemKey) is
|
|
# inside the FileVault envelope. If that isn't true, it may make
|
|
# sense to store the password inside the envelope?
|
|
#
|
|
# 3) At some point it would be ideal to have a small binary to serve
|
|
# as the daemon itself, and for it to replace /usr/bin/security here.
|
|
#
|
|
# 4) *UserAgent exemptions should let the system seamlessly supply the
|
|
# password if noauto is removed from fstab entry. This is intentional;
|
|
# the user will hopefully look for help if the volume stops mounting,
|
|
# rather than failing over into subtle race-condition problems.
|
|
#
|
|
# 5) If we ever get users griping about not having space to do
|
|
# anything useful with Nix, it is possibly to specify
|
|
# `-reserve 10g` or something, which will fail w/o that much
|
|
#
|
|
# 6) getting special w/ awk may be fragile, but doing it to:
|
|
# - save time over running slow diskutil commands
|
|
# - skirt risk we grab wrong volume if multiple match
|
|
_sudo "to create a new APFS volume '$NIX_VOLUME_LABEL' on $NIX_VOLUME_USE_DISK" \
|
|
/usr/sbin/diskutil apfs addVolume "$NIX_VOLUME_USE_DISK" "$NIX_VOLUME_FS" "$NIX_VOLUME_LABEL" -nomount | /usr/bin/awk '/Created new APFS Volume/ {print $5}'
|
|
}
|
|
|
|
volume_uuid_from_special() {
|
|
local volume_special="$1" # (i.e., disk1s7)
|
|
# For reasons I won't pretend to fathom, this returns 253 when it works
|
|
/System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util -k "$volume_special" || true
|
|
}
|
|
|
|
# this sometimes clears immediately, and AFAIK clears
|
|
# within about 1s. diskutil info on an unmounted path
|
|
# fails in around 50-100ms and a match takes about
|
|
# 250-300ms. I suspect it's usually ~250-750ms
|
|
await_volume() {
|
|
# caution: this could, in theory, get stuck
|
|
until /usr/sbin/diskutil info "$NIX_ROOT" &>/dev/null; do
|
|
:
|
|
done
|
|
}
|
|
|
|
setup_volume() {
|
|
local use_special use_uuid profile_packages
|
|
task "Creating a Nix volume" >&2
|
|
|
|
use_special="${NIX_VOLUME_USE_SPECIAL:-$(create_volume)}"
|
|
|
|
_sudo "to ensure the Nix volume is not mounted" \
|
|
/usr/sbin/diskutil unmount force "$use_special" || true # might not be mounted
|
|
|
|
use_uuid=${NIX_VOLUME_USE_UUID:-$(volume_uuid_from_special "$use_special")}
|
|
|
|
setup_fstab "$use_uuid"
|
|
|
|
if should_encrypt_volume; then
|
|
encrypt_volume "$use_uuid" "$NIX_VOLUME_LABEL"
|
|
setup_volume_daemon "encrypted" "$use_uuid"
|
|
# TODO: might be able to save ~60ms by caching or setting
|
|
# this somewhere rather than re-checking here.
|
|
elif volume_encrypted "$use_special"; then
|
|
setup_volume_daemon "encrypted" "$use_uuid"
|
|
else
|
|
setup_volume_daemon "unencrypted" "$use_uuid"
|
|
fi
|
|
|
|
await_volume
|
|
|
|
if [ "$(/usr/sbin/diskutil info -plist "$NIX_ROOT" | xmllint --xpath "(/plist/dict/key[text()='GlobalPermissionsEnabled'])/following-sibling::*[1]" -)" = "<false/>" ]; then
|
|
_sudo "to set enableOwnership (enabling users to own files)" \
|
|
/usr/sbin/diskutil enableOwnership "$NIX_ROOT"
|
|
fi
|
|
|
|
# TODO: below is a vague kludge for now; I just don't know
|
|
# what if any safe action there is to take here. Also, the
|
|
# reminder isn't very helpful.
|
|
# I'm less sure where this belongs, but it also wants mounted, pre-install
|
|
if type -p nix-env; then
|
|
profile_packages="$(nix-env --query --installed)"
|
|
# TODO: can probably do below faster w/ read
|
|
# intentionally unquoted string to eat whitespace in wc output
|
|
# shellcheck disable=SC2046,SC2059
|
|
if ! [ $(printf "$profile_packages" | /usr/bin/wc -l) = "0" ]; then
|
|
reminder <<EOF
|
|
Nix now supports only multi-user installs on Darwin/macOS, and your user's
|
|
Nix profile has some packages in it. These packages may obscure those in the
|
|
default profile, including the Nix this installer will add. You should
|
|
review these packages:
|
|
$profile_packages
|
|
EOF
|
|
fi
|
|
fi
|
|
|
|
}
|
|
|
|
setup_volume_daemon() {
|
|
local cmd_type="$1" # encrypted|unencrypted
|
|
local volume_uuid="$2"
|
|
if ! test_voldaemon; then
|
|
task "Configuring LaunchDaemon to mount '$NIX_VOLUME_LABEL'" >&2
|
|
_sudo "to install the Nix volume mounter" /usr/bin/ex --noplugin "$NIX_VOLUME_MOUNTD_DEST" <<EOF
|
|
:a
|
|
$(generate_mount_daemon "$cmd_type" "$volume_uuid")
|
|
.
|
|
:x
|
|
EOF
|
|
|
|
# TODO: should probably alert the user if this is disabled?
|
|
_sudo "to launch the Nix volume mounter" \
|
|
launchctl bootstrap system "$NIX_VOLUME_MOUNTD_DEST" || true
|
|
# TODO: confirm whether kickstart is necessesary?
|
|
# I feel a little superstitous, but it can guard
|
|
# against multiple problems (doesn't start, old
|
|
# version still running for some reason...)
|
|
_sudo "to launch the Nix volume mounter" \
|
|
launchctl kickstart -k system/org.nixos.darwin-store
|
|
fi
|
|
}
|
|
|
|
setup_darwin_volume() {
|
|
setup_synthetic_conf
|
|
setup_volume
|
|
}
|
|
|
|
if [ "$_CREATE_VOLUME_NO_MAIN" = 1 ]; then
|
|
if [ -n "$*" ]; then
|
|
"$@" # expose functions in case we want multiple routines?
|
|
fi
|
|
else
|
|
# no reason to pay for bash to process this
|
|
main() {
|
|
{
|
|
echo ""
|
|
echo " ------------------------------------------------------------------ "
|
|
echo " | This installer will create a volume for the nix store and |"
|
|
echo " | configure it to mount at $NIX_ROOT. Follow these steps to uninstall. |"
|
|
echo " ------------------------------------------------------------------ "
|
|
echo ""
|
|
echo " 1. Remove the entry from fstab using 'sudo /usr/sbin/vifs'"
|
|
echo " 2. Run 'sudo launchctl bootout system/org.nixos.darwin-store'"
|
|
echo " 3. Remove $NIX_VOLUME_MOUNTD_DEST"
|
|
echo " 4. Destroy the data volume using '/usr/sbin/diskutil apfs deleteVolume'"
|
|
echo " 5. Remove the 'nix' line from /etc/synthetic.conf (or the file)"
|
|
echo ""
|
|
} >&2
|
|
|
|
setup_darwin_volume
|
|
}
|
|
|
|
main "$@"
|
|
fi
|