Use uname -n instead of hostname(1)

The NAS is a minimal Arch install with no inetutils, so hostname(1) does
not exist and install died on its first line of real work. uname -n is
POSIX and always present. The same assumption was in dots, pkg-snapshot,
pkg-restore and zshenv's fallback.

common/bin/dots

@@ -6,7 +6,7 @@
 # point: a login banner that always fires is a banner you stop reading.
 set -uo pipefail
 REPO="${DOTFILES:-$HOME/.dotfiles}"
-HOST="${DOTFILES_HOST:-$(hostname | tr '[:upper:]' '[:lower:]')}"
+HOST="${DOTFILES_HOST:-$(uname -n | tr '[:upper:]' '[:lower:]')}"
 NAG=0; [[ "${1:-}" == "--nag" ]] && NAG=1
 cd "$REPO" 2>/dev/null || exit 0
 

common/bin/pkg-restore

@@ -3,7 +3,7 @@
 # apt's own idempotence mean already-installed packages are skipped.
 set -euo pipefail
 REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
-HOST="${DOTFILES_HOST:-$(hostname | tr '[:upper:]' '[:lower:]')}"
+HOST="${DOTFILES_HOST:-$(uname -n | tr '[:upper:]' '[:lower:]')}"
 P="${REPO}/packages"
 
 if [[ -f "${P}/${HOST}.pacman" ]]; then

common/bin/pkg-snapshot

@@ -4,7 +4,7 @@
 # The diff doubles as a log of what you added and when.
 set -euo pipefail
 REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
-HOST="${DOTFILES_HOST:-$(hostname | tr '[:upper:]' '[:lower:]')}"
+HOST="${DOTFILES_HOST:-$(uname -n | tr '[:upper:]' '[:lower:]')}"
 OUT="${REPO}/packages"
 mkdir -p "$OUT"
 

common/zsh/zshenv

@@ -2,7 +2,7 @@
 # Keep it cheap: no subshells in the hot path, no vault lookups, no network.
 
 export DOTFILES="${DOTFILES:-$HOME/.dotfiles}"
-: ${DOTFILES_HOST:=${(L)${HOST:-$(hostname)}}}   # lowercased; SCTFW004 -> sctfw004
+: ${DOTFILES_HOST:=${(L)${HOST:-$(uname -n)}}}   # lowercased; SCTFW004 -> sctfw004
 export DOTFILES_HOST
 
 export EDITOR="nvim"

install

@@ -7,7 +7,9 @@ set -euo pipefail
 BASEDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 DOTBOT_DIR="dotbot"
 DOTBOT_BIN="bin/dotbot"
-HOST="${DOTFILES_HOST:-$(hostname | tr '[:upper:]' '[:lower:]')}"
+# uname -n, not hostname(1): the latter comes from inetutils and is absent on
+# a minimal Arch install. The NAS had no hostname binary at all.
+HOST="${DOTFILES_HOST:-$(uname -n | tr '[:upper:]' '[:lower:]')}"
 HOSTCONF="meta/hosts/${HOST}.conf.yaml"
 
 cd "${BASEDIR}"