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install-darwin: dodge bash 3.2 command bug

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The script is trying to find chown in a cross-platform-like
way, but there's some sort of deficiency in `command -p` in
the default macOS bash 3.2. It looks like it will just use
whatever PATH is already set, instead of the "default" path.

This attempts to hard-set a PATH via `getconf PATH`. It will
just set an empty PATH if that fails for some reason. A
properly-functioning `command -p` should not care what we
set the PATH to here one way or the other.

Hopefully fixes #5768.
This commit is contained in:
Travis A. Everett 2022-01-20 20:32:19 -06:00
parent 067076287b
commit bdb5e03821
1 changed files with 22 additions and 3 deletions
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25
scripts/install-multi-user.sh
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@ -576,18 +576,37 @@ create_directories() {
# since this bit is cross-platform:
# - first try with `command -vp` to try and find
# chown in the usual places
# * to work around some sort of deficiency in
# `command -p` in macOS bash 3.2, we also add
# PATH="$(getconf PATH 2>/dev/null)". As long as
# getconf is found, this should set a sane PATH
# which `command -p` in bash 3.2 appears to use.
# A bash with a properly-working `command -p`
# should ignore this hard-set PATH in favor of
# whatever it obtains internally. See
# github.com/NixOS/nix/issues/5768
# - fall back on `command -v` which would find
# any chown on path
# if we don't find one, the command is already
# hiding behind || true, and the general state
# should be one the user can repair once they
# figure out where chown is...
local get_chr_own="$(command -vp chown)"
local get_chr_own="$(PATH="$(getconf PATH 2>/dev/null)" command -vp chown)"
if [[ -z "$get_chr_own" ]]; then
get_chr_own="$(command -v chown)"
fi
_sudo "to take root ownership of existing Nix store files" \
"$get_chr_own" -R "root:$NIX_BUILD_GROUP_NAME" "$NIX_ROOT" || true
if [[ -z "$get_chr_own" ]]; then
reminder <<EOF
I wanted to take root ownership of existing Nix store files,
but I couldn't locate 'chown'. (You may need to fix your PATH.)
To manually change file ownership, you can run:
sudo chown -R 'root:$NIX_BUILD_GROUP_NAME' '$NIX_ROOT'
EOF
else
_sudo "to take root ownership of existing Nix store files" \
"$get_chr_own" -R "root:$NIX_BUILD_GROUP_NAME" "$NIX_ROOT" || true
fi
fi
_sudo "to make the basic directory structure of Nix (part 1)" \
install -dv -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