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perf(init): cache the LocalHostName lookup (#14066)

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Robby Russell
2026-09-18 11:27:06 +02:00
committed by GitHub
parent 7ce781ea37
commit e7852049a5
1 changed files with 22 additions and 1 deletions
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oh-my-zsh.sh
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@@ -100,7 +100,28 @@ done
# Figure out the SHORT hostname # Figure out the SHORT hostname
if [[ "$OSTYPE" = darwin* ]]; then if [[ "$OSTYPE" = darwin* ]]; then
# macOS's $HOST changes with dhcp, etc. Use LocalHostName if possible. # macOS's $HOST changes with dhcp, etc. Use LocalHostName if possible.
SHORT_HOST=$(scutil --get LocalHostName 2>/dev/null) || SHORT_HOST="${HOST/.*/}" # scutil costs a fork on every start, so remember its answer for a day
# (like lib/grep.zsh) and re-check sooner if $HOST changes.
__omz_host_cache="$ZSH_CACHE_DIR/localhostname"
__omz_host_cached=("$__omz_host_cache"(Nm-1))
__omz_host_key=
SHORT_HOST=
if [[ -n "$__omz_host_cached" ]]; then
if ! { read -r __omz_host_key && read -r SHORT_HOST } < "$__omz_host_cache"; then
__omz_host_key=
SHORT_HOST=
fi
fi
if [[ "$__omz_host_key" != "$HOST" || -z "$SHORT_HOST" ]]; then
# only cache what scutil actually answered, so a transient failure
# doesn't pin the fallback name for a day
if SHORT_HOST=$(scutil --get LocalHostName 2>/dev/null) && [[ -n "$SHORT_HOST" ]]; then
[[ ! -w "$ZSH_CACHE_DIR" ]] || print -rl -- "$HOST" "$SHORT_HOST" >| "$__omz_host_cache"
else
SHORT_HOST="${HOST/.*/}"
fi
fi
unset __omz_host_cache __omz_host_cached __omz_host_key
else else
SHORT_HOST="${HOST/.*/}" SHORT_HOST="${HOST/.*/}"
fi fi