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perf(init): cache the LocalHostName lookup instead of inferring it

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Deriving SHORT_HOST from a .local suffix assumed $HOST came from
LocalHostName, but macOS lets HostName be set independently, so a
HostName ending in .local would change SHORT_HOST and with it the
zcompdump name and the ssh-agent and keychain cache identities.

Ask scutil as before, but remember its answer against the $HOST it was
looked up for, so the fork only happens when $HOST changes. An
unreadable, empty or unwritable cache falls back to forking every time,
which is today's behaviour.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Robby Russell
2026-09-07 08:07:51 -07:00
co-authored by Claude Opus 5
parent b37d4878ed
commit fe25122da0
1 changed files with 10 additions and 6 deletions
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oh-my-zsh.sh
+10 -6
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@@ -100,13 +100,17 @@ done
# Figure out the SHORT hostname
if [[ "$OSTYPE" = darwin* ]]; then
# macOS's $HOST changes with dhcp, etc. Use LocalHostName if possible.
# When $HOST is the Bonjour name (<LocalHostName>.local) it already is the
# LocalHostName, so don't fork scutil to look it up.
if [[ "$HOST" = *.local ]]; then
SHORT_HOST="${HOST%.local}"
else
SHORT_HOST=$(scutil --get LocalHostName 2>/dev/null) || SHORT_HOST="${HOST/.*/}"
# scutil costs a fork on every start, so remember its answer against the
# $HOST it was looked up for and only ask again when $HOST changes.
__omz_host_cache="$ZSH_CACHE_DIR/localhostname"
if [[ -r "$__omz_host_cache" ]]; then
{ read -r __omz_host_key && read -r SHORT_HOST } < "$__omz_host_cache"
fi
if [[ "$__omz_host_key" != "$HOST" || -z "$SHORT_HOST" ]]; then
SHORT_HOST=$(scutil --get LocalHostName 2>/dev/null) || SHORT_HOST="${HOST/.*/}"
[[ ! -w "$ZSH_CACHE_DIR" ]] || print -rl -- "$HOST" "$SHORT_HOST" >| "$__omz_host_cache"
fi
unset __omz_host_cache __omz_host_key
else
SHORT_HOST="${HOST/.*/}"
fi