diff options
author | Travis A. Everett <travis.a.everett@gmail.com> | 2020-05-14 21:59:10 -0500 |
---|---|---|
committer | Daiderd Jordan <daiderd@gmail.com> | 2020-05-21 19:58:11 +0200 |
commit | 2b0a81d92d28994374465c44c79f020d5e044700 (patch) | |
tree | eff0be6658bcc4e1f7c9da1e487511ab55652cfb /scripts | |
parent | 477d7c2d07e146c91950401b8b9d9380ce6787e5 (diff) |
focus on golden-path covering most scenarios
This should handle installation scenarios we can handle with
anything resembling confidence. Goal is approximating the existing
setup--not enforcing a best-practice...
Approaches (+ installer-handled, - manual) and configs each covers:
+ no change needed; /nix OK on boot volume:
All pre-Catalina (regardless of T2 or FileVault use)
+ create new unencrypted volume:
Catalina, pre-T2, no FileVault
+ create new encrypted-at-rest volume:
Catalina, pre-T2, FileVault
Catalina, T2, no FileVault
- require user to pre-create encrypted volume
Catalina, T2, FileVault
Diffstat (limited to 'scripts')
-rwxr-xr-x | scripts/create-darwin-volume.sh | 77 | ||||
-rw-r--r-- | scripts/install-nix-from-closure.sh | 19 |
2 files changed, 71 insertions, 25 deletions
diff --git a/scripts/create-darwin-volume.sh b/scripts/create-darwin-volume.sh index a0da85f43..47cc3e913 100755 --- a/scripts/create-darwin-volume.sh +++ b/scripts/create-darwin-volume.sh @@ -59,10 +59,45 @@ test_nix() { test -d "/nix" } -test_filevault() { +test_t2_chip_present(){ + # Use xartutil to see if system has a t2 chip. + # + # This isn't well-documented on its own; until it is, + # let's keep track of knowledge/assumptions. + # + # Warnings: + # - Don't search "xart" if porn will cause you trouble :) + # - Other xartutil flags do dangerous things. Don't run them + # naively. If you must, search "xartutil" first. + # + # Assumptions: + # - the "xART session seeds recovery utility" + # appears to interact with xartstorageremoted + # - `sudo xartutil --list` lists xART sessions + # and their seeds and exits 0 if successful. If + # not, it exits 1 and prints an error such as: + # xartutil: ERROR: No supported link to the SEP present + # - xART sessions/seeds are present when a T2 chip is + # (and not, otherwise) + # - the presence of a T2 chip means a newly-created + # volume on the primary drive will be + # encrypted at rest + # - all together: `sudo xartutil --list` + # should exit 0 if a new Nix Store volume will + # be encrypted at rest, and exit 1 if not. + sudo xartutil --list >/dev/null 2>/dev/null +} + +test_filevault_in_use() { disk=$1 - apfs_volumes_for "$disk" | volume_list_true FileVault | grep -q true || return - ! sudo xartutil --list >/dev/null 2>/dev/null + # list vols on disk | get value of Filevault key | value is true + apfs_volumes_for "$disk" | volume_list_true FileVault | grep -q true +} + +# use after error msg for conditions we don't understand +suggest_report_error(){ + # ex "error: something sad happened :(" >&2 + echo " please report this @ https://github.com/nixos/nix/issues" >&2 } main() { @@ -89,7 +124,8 @@ main() { echo "Configuring /etc/synthetic.conf..." >&2 echo nix | sudo tee /etc/synthetic.conf if ! test_synthetic_conf; then - echo "error: failed to configure synthetic.conf" >&2 + echo "error: failed to configure synthetic.conf;" >&2 + suggest_report_error exit 1 fi fi @@ -101,7 +137,8 @@ main() { sudo mkdir -p /nix 2>/dev/null || true fi if ! test_nix; then - echo "error: failed to bootstrap /nix, a reboot might be required" >&2 + echo "error: failed to bootstrap /nix; if a reboot doesn't help," >&2 + suggest_report_error exit 1 fi fi @@ -111,10 +148,25 @@ main() { if [ -z "$volume" ]; then echo "Creating a Nix Store volume..." >&2 - if test_filevault "$disk"; then - echo "error: FileVault detected, refusing to create unencrypted volume" >&2 - echo "See https://nixos.org/nix/manual/#sect-apfs-volume-installation" >&2 - exit 1 + if test_filevault_in_use "$disk"; then + # TODO: Not sure if it's in-scope now, but `diskutil apfs list` + # shows both filevault and encrypted at rest status, and it + # may be the more semantic way to test for this? It'll show + # `FileVault: No (Encrypted at rest)` + # `FileVault: No` + # `FileVault: Yes (Unlocked)` + # and so on. + if test_t2_chip_present; then + echo "warning: boot volume is FileVault-encrypted, but the Nix store volume" >&2 + echo " is only encrypted at rest." >&2 + echo " See https://nixos.org/nix/manual/#sect-macos-installation" >&2 + else + echo "error: refusing to create Nix store volume because the boot volume is" >&2 + echo " FileVault encrypted, but encryption-at-rest is not available." >&2 + echo " Manually create a volume for the store and re-run this script." >&2 + echo " See https://nixos.org/nix/manual/#sect-macos-installation" >&2 + exit 1 + fi fi sudo diskutil apfs addVolume "$disk" APFS 'Nix Store' -mountpoint /nix @@ -128,13 +180,6 @@ main() { label=$(echo "$volume" | sed 's/ /\\040/g') printf "\$a\nLABEL=%s /nix apfs rw,nobrowse\n.\nwq\n" "$label" | EDITOR=ed sudo vifs fi - - echo "" >&2 - echo "The following options can be enabled to disable spotlight indexing" >&2 - echo "of the volume, which might be desirable." >&2 - echo "" >&2 - echo " $ sudo mdutil -i off /nix" >&2 - echo "" >&2 } main "$@" diff --git a/scripts/install-nix-from-closure.sh b/scripts/install-nix-from-closure.sh index 2f291ed4c..72aa5abf5 100644 --- a/scripts/install-nix-from-closure.sh +++ b/scripts/install-nix-from-closure.sh @@ -52,7 +52,7 @@ while [ $# -gt 0 ]; do NIX_INSTALLER_NO_CHANNEL_ADD=1;; --no-modify-profile) NIX_INSTALLER_NO_MODIFY_PROFILE=1;; - --create-volume) + --darwin-use-unencrypted-nix-store-volume) CREATE_DARWIN_VOLUME=1;; *) ( @@ -77,12 +77,13 @@ while [ $# -gt 0 ]; do echo "" ) >&2 - if [ "$(uname -s)" = "Darwin" ]; then + # darwin and Catalina+ + if [ "$(uname -s)" = "Darwin" ] && [ "$macos_major" -gt 14 ]; then ( - echo " --create-volume: Create an APFS volume for the store and create the /nix" - echo " mountpoint for it using synthetic.conf." - echo " (required on macOS >=10.15)" - echo " See https://nixos.org/nix/manual/#sect-apfs-volume-installation" + echo " --darwin-use-unencrypted-nix-store-volume: Create an APFS volume for the Nix" + echo " store and mount it at /nix. This is the recommended way to create" + echo " /nix with a read-only / on macOS >=10.15." + echo " See: https://nixos.org/nix/manual/#sect-macos-installation" echo "" ) >&2 fi @@ -98,12 +99,12 @@ if [ "$(uname -s)" = "Darwin" ]; then fi info=$(diskutil info -plist / | xpath "/plist/dict/key[text()='Writable']/following-sibling::true[1]" 2> /dev/null) - if ! [ -e $dest ] && [ -n "$info" ]; then + if ! [ -e $dest ] && [ -n "$info" ] && [ "$macos_major" -gt 14 ]; then ( echo "" echo "Installing on macOS >=10.15 requires relocating the store to an apfs volume." - echo "Use sh <(curl https://nixos.org/nix/install) --create-volume or run the preparation steps manually." - echo "See https://nixos.org/nix/manual/#sect-apfs-volume-installation" + echo "Use sh <(curl https://nixos.org/nix/install) --darwin-use-unencrypted-nix-store-volume or run the preparation steps manually." + echo "See https://nixos.org/nix/manual/#sect-macos-installation" echo "" ) >&2 exit 1 |