ohmyzsh/tools/check_for_upgrade.sh
Marc Cornellà 29b99c2c7b
feat(updater): add background-alpha update mode (preview) ()
NOTE: this feature is in alpha / preview mode, it is not guaranteed to work 100% of the
time in all cases. If you experience any issues, open an issue or search for an open
one describing your same situation.

To use this, use the zstyle update mode settings [1] with the value `background-alpha`:

  zstyle ':omz:update' mode background-alpha

[1] https://github.com/ohmyzsh/ohmyzsh#getting-updates
2023-10-09 18:00:17 +02:00

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# Migrate .zsh-update file to $ZSH_CACHE_DIR
if [[ -f ~/.zsh-update && ! -f "${ZSH_CACHE_DIR}/.zsh-update" ]]; then
mv ~/.zsh-update "${ZSH_CACHE_DIR}/.zsh-update"
fi
# Get user's update preferences
#
# Supported update modes:
# - prompt (default): the user is asked before updating when it's time to update
# - auto: the update is performed automatically when it's time
# - reminder: a reminder is shown to the user when it's time to update
# - background-alpha: an experimental update-on-the-background option
# - disabled: automatic update is turned off
zstyle -s ':omz:update' mode update_mode || {
update_mode=prompt
# If the mode zstyle setting is not set, support old-style settings
[[ "$DISABLE_UPDATE_PROMPT" != true ]] || update_mode=auto
[[ "$DISABLE_AUTO_UPDATE" != true ]] || update_mode=disabled
}
# Cancel update if:
# - the automatic update is disabled.
# - the current user doesn't have write permissions nor owns the $ZSH directory.
# - is not run from a tty
# - git is unavailable on the system.
if [[ "$update_mode" = disabled ]] \
|| [[ ! -w "$ZSH" || ! -O "$ZSH" ]] \
|| [[ ! -t 1 ]] \
|| ! command git --version 2>&1 >/dev/null; then
unset update_mode
return
fi
function current_epoch() {
zmodload zsh/datetime
echo $(( EPOCHSECONDS / 60 / 60 / 24 ))
}
function is_update_available() {
local branch
branch=${"$(builtin cd -q "$ZSH"; git config --local oh-my-zsh.branch)":-master}
local remote remote_url remote_repo
remote=${"$(builtin cd -q "$ZSH"; git config --local oh-my-zsh.remote)":-origin}
remote_url=$(builtin cd -q "$ZSH"; git config remote.$remote.url)
local repo
case "$remote_url" in
https://github.com/*) repo=${${remote_url#https://github.com/}%.git} ;;
git@github.com:*) repo=${${remote_url#git@github.com:}%.git} ;;
*)
# If the remote is not using GitHub we can't check for updates
# Let's assume there are updates
return 0 ;;
esac
# If the remote repo is not the official one, let's assume there are updates available
[[ "$repo" = ohmyzsh/ohmyzsh ]] || return 0
local api_url="https://api.github.com/repos/${repo}/commits/${branch}"
# Get local HEAD. If this fails assume there are updates
local local_head
local_head=$(builtin cd -q "$ZSH"; git rev-parse $branch 2>/dev/null) || return 0
# Get remote HEAD. If no suitable command is found assume there are updates
# On any other error, skip the update (connection may be down)
local remote_head
remote_head=$(
if (( ${+commands[curl]} )); then
curl --connect-timeout 2 -fsSL -H 'Accept: application/vnd.github.v3.sha' $api_url 2>/dev/null
elif (( ${+commands[wget]} )); then
wget -T 2 -O- --header='Accept: application/vnd.github.v3.sha' $api_url 2>/dev/null
elif (( ${+commands[fetch]} )); then
HTTP_ACCEPT='Accept: application/vnd.github.v3.sha' fetch -T 2 -o - $api_url 2>/dev/null
else
exit 0
fi
) || return 1
# Compare local and remote HEADs (if they're equal there are no updates)
[[ "$local_head" != "$remote_head" ]] || return 1
# If local and remote HEADs don't match, check if there's a common ancestor
# If the merge-base call fails, $remote_head might not be downloaded so assume there are updates
local base
base=$(builtin cd -q "$ZSH"; git merge-base $local_head $remote_head 2>/dev/null) || return 0
# If the common ancestor ($base) is not $remote_head,
# the local HEAD is older than the remote HEAD
[[ $base != $remote_head ]]
}
function update_last_updated_file() {
local exit_status="$1" error="$2"
if [[ -z "${1}${2}" ]]; then
echo "LAST_EPOCH=$(current_epoch)" >! "${ZSH_CACHE_DIR}/.zsh-update"
return
fi
cat >! "${ZSH_CACHE_DIR}/.zsh-update" <<EOD
LAST_EPOCH=$(current_epoch)
EXIT_STATUS=${exit_status}
ERROR='${error//\'/}'
EOD
}
function update_ohmyzsh() {
local verbose_mode
zstyle -s ':omz:update' verbose verbose_mode || verbose_mode=default
if [[ "$update_mode" != background-alpha ]] \
&& LANG= ZSH="$ZSH" zsh -f "$ZSH/tools/upgrade.sh" -i -v $verbose_mode; then
update_last_updated_file
return $?
fi
local exit_status error
if error=$(LANG= ZSH="$ZSH" zsh -f "$ZSH/tools/upgrade.sh" -i -v silent 2>&1); then
update_last_updated_file 0 "Update successful"
else
exit_status=$?
update_last_updated_file $exit_status "$error"
return $exit_status
fi
}
function has_typed_input() {
# Created by Philippe Troin <phil@fifi.org>
# https://zsh.org/mla/users/2022/msg00062.html
emulate -L zsh
zmodload zsh/zselect
# Back up stty settings prior to disabling canonical mode
# Consider that no input can be typed if stty fails
# (this might happen if stdin is not a terminal)
local termios
termios=$(stty --save 2>/dev/null) || return 1
{
# Disable canonical mode so that typed input counts
# regardless of whether Enter was pressed
stty -icanon
# Poll stdin (fd 0) for data ready to be read
zselect -t 0 -r 0
return $?
} always {
# Restore stty settings
stty $termios
}
}
function handle_update() {
() {
emulate -L zsh
local epoch_target mtime option LAST_EPOCH
# Remove lock directory if older than a day
zmodload zsh/datetime
zmodload -F zsh/stat b:zstat
if mtime=$(zstat +mtime "$ZSH/log/update.lock" 2>/dev/null); then
if (( (mtime + 3600 * 24) < EPOCHSECONDS )); then
command rm -rf "$ZSH/log/update.lock"
fi
fi
# Check for lock directory
if ! command mkdir "$ZSH/log/update.lock" 2>/dev/null; then
return
fi
# Remove lock directory on exit. `return $ret` is important for when trapping a SIGINT:
# The return status from the function is handled specially. If it is zero, the signal is
# assumed to have been handled, and execution continues normally. Otherwise, the shell
# will behave as interrupted except that the return status of the trap is retained.
# This means that for a CTRL+C, the trap needs to return the same exit status so that
# the shell actually exits what it's running.
trap "
ret=\$?
unset update_mode
unset -f current_epoch is_update_available update_last_updated_file update_ohmyzsh handle_update 2>/dev/null
command rm -rf '$ZSH/log/update.lock'
return \$ret
" EXIT INT QUIT
# Create or update .zsh-update file if missing or malformed
if ! source "${ZSH_CACHE_DIR}/.zsh-update" 2>/dev/null || [[ -z "$LAST_EPOCH" ]]; then
update_last_updated_file
return
fi
# Number of days before trying to update again
zstyle -s ':omz:update' frequency epoch_target || epoch_target=${UPDATE_ZSH_DAYS:-13}
# Test if enough time has passed until the next update
if (( ( $(current_epoch) - $LAST_EPOCH ) < $epoch_target )); then
return
fi
# Test if Oh My Zsh directory is a git repository
if ! (builtin cd -q "$ZSH" && LANG= git rev-parse &>/dev/null); then
echo >&2 "[oh-my-zsh] Can't update: not a git repository."
return
fi
# Check if there are updates available before proceeding
if ! is_update_available; then
update_last_updated_file
return
fi
# If in reminder mode or user has typed input, show reminder and exit
if [[ "$update_mode" = reminder ]] || { [[ "$update_mode" != background-alpha ]] && has_typed_input }; then
printf '\r\e[0K' # move cursor to first column and clear whole line
echo "[oh-my-zsh] It's time to update! You can do that by running \`omz update\`"
return 0
fi
# Don't ask for confirmation before updating if in auto mode
if [[ "$update_mode" = (auto|background-alpha) ]]; then
update_ohmyzsh
return $?
fi
# Ask for confirmation and only update on 'y', 'Y' or Enter
# Otherwise just show a reminder for how to update
echo -n "[oh-my-zsh] Would you like to update? [Y/n] "
read -r -k 1 option
[[ "$option" = $'\n' ]] || echo
case "$option" in
[yY$'\n']) update_ohmyzsh ;;
[nN]) update_last_updated_file ;&
*) echo "[oh-my-zsh] You can update manually by running \`omz update\`" ;;
esac
}
unset update_mode
unset -f current_epoch is_update_available update_last_updated_file update_ohmyzsh handle_update
}
case "$update_mode" in
background-alpha)
autoload -Uz add-zsh-hook
_omz_bg_update() {
# do the update in a subshell
(handle_update) &|
# register update results function
add-zsh-hook precmd _omz_bg_update_status
# deregister background function
add-zsh-hook -d precmd _omz_bg_update
unset -f _omz_bg_update
}
_omz_bg_update_status() {
{
local LAST_EPOCH EXIT_STATUS ERROR
if [[ ! -f "$ZSH_CACHE_DIR"/.zsh-update ]]; then
return 1
fi
# check update results until timeout is reached
. "$ZSH_CACHE_DIR/.zsh-update"
if [[ -z "$EXIT_STATUS" || -z "$ERROR" ]]; then
return 1
fi
if [[ "$EXIT_STATUS" -eq 0 ]]; then
print -P "\n%F{green}[oh-my-zsh] Update successful.%f"
return 0
elif [[ "$EXIT_STATUS" -ne 0 ]]; then
print -P "\n%F{red}[oh-my-zsh] There was an error updating:%f"
printf "\n${fg[yellow]}%s${reset_color}" "$ERROR"
return 0
fi
} always {
if (( TRY_BLOCK_ERROR == 0 )); then
# if last update results have been handled, remove them from the status file
update_last_updated_file
# deregister background function
add-zsh-hook -d precmd _omz_bg_update_status
unset -f _omz_bg_update_status
fi
}
}
add-zsh-hook precmd _omz_bg_update
;;
*)
handle_update ;;
esac