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#!/bin/sh
# Compares the currently installed Git for Windows against latest available
# release. If versions differ, the bit matched installer is downloaded and run
# when confirmation to do so is given.
# Compare version strings
# Prints -1, 0 or 1 to stdout
version_compare () {
a="$1"
b="$2"
while true
do
test -n "$b" || { echo 1; return; }
test -n "$a" || { echo -1; return; }
# Get the first numbers (if any)
a1="$(expr "$a" : '^\([0-9]*\)')"; a="${a#$a1}"
b1="$(expr "$b" : '^\([0-9]*\)')"; b="${b#$b1}"
if test -z "$b1"
then
test -z "$a1" || { echo 1; return; }
a1=0
b1=0
fi
test -n "$a1" || { echo -1; return; }
test $a1 -le $b1 || { echo 1; return; }
test $b1 -le $a1 || { echo -1; return; }
# Skip non-numeric prefixes
a1="$(expr "$a" : '^\([^0-9]\+\)')"; a="${a#$a1}"
b1="$(expr "$b" : '^\([^0-9]\+\)')"; b="${b#$b1}"
case "$a1,$b1" in
[.-]rc,[.-]rc) ;; # both are -rc versions
[.-]rc,*) echo -1; return;;
*,[.-]rc) echo 1; return;;
esac
done
}
test "--test-version-compare" != "$*" || {
test_version_compare () {
result="$(version_compare "$1" "$2")"
test "$3" = "$result" || {
echo "version_compare $1 $2 returned $result instead of $3" >&2
exit 1
}
result2="$(version_compare "$2" "$1")"
test "$result2" = "$((-$3))" || {
echo "version_compare $2 $1 returned $result2 instead of $((-$3))" >&2
exit 1
}
}
test_version_compare 2.32.0.windows.1 2.32.1.windows.1 -1
test_version_compare 2.32.1.windows.1 2.32.0.windows.1 1
test_version_compare 2.32.1.vfs.0.0 2.32.0.windows.1 1
test_version_compare 2.32.1.vfs.0.0 2.32.0.vfs.0.0 1
test_version_compare 2.32.0.vfs.0.1 2.32.0.vfs.0.2 -1
test_version_compare 2.32.0-rc0.windows.1 2.31.1.windows.1 1
test_version_compare 2.32.0-rc2.windows.1 2.32.0.windows.1 -1
test_version_compare 2.34.0.rc1.windows.1 2.33.1.windows.1 1
test_version_compare 2.34.0.rc2.windows.1 2.34.0.windows.1 -1
exit 0
}
# Counts how many Bash instances are running, apart from the current one (if
# any: `git update-git-for-windows` might have been called from a CMD window,
# in which case no Git Bash might be running at all).
#
# This is a little tricky, as the /usr/bin/sh process (as which `ps` reports the
# process running this script) is an MSYS2 one, but the calling `git.exe`
# process is a pure Win32 one. As a consequence, the former process' PPID will
# be reported as 1 (!!!) and its PGID will refer to the latter, while the
# latter's PGID will be identical to its PID and its PPID refers to the calling
# Bash (or is 1, if `git.exe` was not called by an MSYS2 program).
#
# So we have to employ a little sed fu to parse `ps` output of the form:
#
# PID PPID PGID WINPID TTY UID STIME COMMAND
# 19864 15640 19864 27996 pty0 4853009 15:58:05 /usr/bin/bash
# 15640 1 15640 15640 ? 4853009 15:58:05 /usr/bin/mintty
# 28128 13048 21176 28716 pty0 4853009 16:01:08 /usr/bin/ps
# 13048 1 21176 13048 pty0 4853009 16:01:08 /usr/bin/sh
# 21176 19864 21176 11996 pty0 4853009 16:01:08 /mingw64/bin/git
#
# Essentially, we are looking for the /usr/bin/sh line (in the example, PID
# 13048), follow its PGID to the /mingw64/bin/git line (in the example, PID
# 21176), and record the PPID of the latter as the pid of the current Bash, if
# any. As we do not know in which order the `sh` and the `git` line appear, we
# have to handle both orders.
#
# Then, we filter the `ps` output first by dropping the line with the current
# Bash, then finally counting the remaining lines referring to a bash process.
count_other_bashes () {
mypid=$$ && nl='\n *' && s=' *' && p='[1-9][0-9]*' &&
mypid="$(ps | sed -n ":1;N;
s/.*$nl$mypid$s$p$s\\($p\\) .*$nl\\1$s\\($p\\) .*/\\2/p;
s/.*$nl\\($p\\)$s\\($p\\) .*$nl$mypid$s$p$s\\1 .*/\\2/p;
b1")"
ps |
if test -z "$mypid"; then cat; else grep -v "^ *$mypid "; fi |
grep ' /usr/bin/bash$' |
wc -l
}
# Write HTTP GET response to stdout and return error code. This is equivalent
# to curl --fail, except that we output the response body to stderr in case of
# an HTTP error status.
http_get () {
url=$1
output=$(mktemp -t gfw-httpget-XXXXXXXX.txt)
code=$(curl \
--silent \
--show-error \
--output "$output" \
--write-out '%{http_code}' \
"$url") || return $?
fdout=1
ret=0
if test "$code" -ge 400
then
fdout=2
ret=22
fi
cat "$output" >&"$fdout"
rm -f "$output"
return "$ret"
}
get_recently_seen() {
if [ -f "$HOME"/.git-for-windows-updater ]; then
git config -f "$HOME"/.git-for-windows-updater winUpdater.recentlySeenVersion
else
git config --global winUpdater.recentlySeenVersion
fi
}
set_recently_seen() {
git config -f "$HOME"/.git-for-windows-updater winUpdater.recentlySeenVersion "$1"
}
# The main function of this script
update_git_for_windows () {
proxy=$(git config --get http.proxy)
if test -n "$proxy"
then
export https_proxy="$proxy"
echo "Using proxy server $https_proxy detected from git http.proxy" >&2
fi
yn=
use_gui=
quiet=
testing=
while test $# -gt 0
do
case "$1" in
-\?|--?\?|-h|--help) ;;
-y|--yes) yn=y; shift; continue;;
-g|--gui) use_gui=t; shift; continue;;
--quiet) quiet=t; shift; continue;;
--testing) testing=t; shift; continue;;
*) echo "Unknown option: $1" >&2;;
esac
printf >&2 '%s\n%s\n\t%s\n\t%s\n' \
"Usage: git update-git-for-windows [options]" \
"Options:" \
"-g, --gui Use GUI instead of terminal to prompt" \
"-y, --yes Automatic yes to download and install prompt" \
"Return code:" \
" 0: no update available" \
" 1: update available and user selected not to update" \
" 2: update available and it was started"
return 1
done
case "$(uname -m)" in
x86_64) bit=64;;
*) bit=32;;
esac
try_toast=
test -z "$use_gui" ||
case "$(uname -s)" in
*-6.[23]|*-6.[23]-[1-9]*|*-10.0|*-10.0-[1-9]*)
# Only try to show a Toast notification on Windows 8 & 10,
# and only if we have a working wintoast.exe
! type wintoast.exe >/dev/null 2>&1 ||
try_toast=t
;;
esac
test -f "$0.config" &&
fork="$(git config -f "$0.config" update.fromFork)" &&
test -n "$fork" ||
fork=
if test -n "$fork"
then
git_label="$(git config -f "$0.config" update.gitLabel)"
test -n "$git_label" || git_label=Git
releases_url=https://api.github.com/repos/$fork/releases
latest_tag_url=$releases_url/latest
latest_eval='latest=${latest_tag#*\"tag_name\": \"v}; latest=${latest%%\"*}'
else
git_label="Git for Windows"
releases_url=https://api.github.com/repos/git-for-windows/git/releases
latest_tag_url=https://gitforwindows.org/latest-tag.txt
latest_eval='latest=${latest_tag#v}'
fi
latest_tag=$(http_get $latest_tag_url) ||
case $?,"$proxy" in
7,)
proxy="$(proxy-lookup.exe https://gitforwindows.org)" &&
test -n "$proxy" &&
export https_proxy="$proxy" &&
echo "Using proxy $https_proxy as per lookup" >&2 &&
latest_tag=$(http_get $latest_tag_url) ||
return
;;
*)
return
;;
esac
eval "$latest_eval"
# Be extra careful to remove a leading 'v' from the tag.
latest=${latest#v}
# Did we ask about this version already?
if test -z "$use_recently_seen"
then
recently_seen="$(get_recently_seen)"
test -n "$quiet" && test "x$recently_seen" = "x$latest" && return
fi
version=$(git --version | sed "s/git version //")
if test -d /clangarm64/bin
then
arch_bit=arm64
else
arch_bit=${bit}-bit
fi
echo "$git_label $version ($arch_bit)" >&2
if test -z "$testing" && test "$latest" = "$version"
then
echo "Up to date" >&2
set_recently_seen "$latest"
return
fi
if ! test -n "$testing"
then
# We are not testing and we don't have exact equality,
# so do a careful comparison and look to see if the
# latest release is strictly newer than ours.
if test 0 -lt "$(version_compare "$version" "$latest")"
then
return
fi
fi
echo "Update $latest is available" >&2
releases=$(http_get $releases_url/latest) || return
download=$(echo "$releases" |
grep '"browser_download_url": "' |
grep "$arch_bit\.exe" |
sed -E 's/.*": "([^"]*).*/\1/')
filename=$(echo "$download" | sed -E 's/.*\/([^\/]*)$/\1/')
name="$(echo "$releases" | sed -n 's/^ "name": "\(.*\)",$/\1/p')"
installer=$(mktemp -t gfw-install-XXXXXXXX.exe)
if test -z "$yn"
then
other_bashes=$(count_other_bashes)
if test $other_bashes -le 0
then
warn=
elif test $other_bashes -eq 1
then
warn=" (killing one Git Bash)"
else
warn=" (killing $other_bashes Git Bash instances)"
fi
if test -n "$try_toast"
then
wintoast.exe --appname "$git_label" \
--appid GitForWindows.Updater \
--image /mingw$bit/share/git/git-for-windows.ico \
--text "Download and install $name$warn?" \
--action Yes --action No --expirems 15000
case $? in
0|16)
# clicked toast, or clicked Yes: download
;;
1|17)
# dismiseed, or clicked No: ignore this release
set_recently_seen "$latest"
return 1
;;
4|5|6|9|10)
# toast not activated, failed, toasts
# unsupported, WinToast init failed or toast
# not launched: fall back to using GUI
git askyesno \
--title "Git Update Available" \
"Download and install $name$warn?" || {
set_recently_seen "$latest"
return 1
}
;;
*)
# toast timed out, or hidden, or unknown
# failure: ignore
return 1
;;
esac
elif test -n "$use_gui"
then
git askyesno --title "Git Update Available" \
"Download and install $name$warn?" || {
set_recently_seen "$latest"
return 1
}
else
read -p "Download and install $name$warn [N/y]? " \
yn >&2
case "$yn" in
[Yy]*) ;;
*)
set_recently_seen "$latest"
return 1;;
esac
fi
else
echo "Downloading $filename" >&2
fi
curl -# -L -o $installer $download || return
start "" "$installer" //SILENT //NORESTART
# Kill all Bash processes (which will let MinTTY quit, too)"
#
# `ps` without `-W` will automatically only catch MSYS2 processes
# that link to *this* MSYS2 runtime, i.e. no processes from other Git
# installations (e.g. Git for Windows' SDK) will be killed.
ps | grep ' /usr/bin/bash$' | awk '{print "kill -9 " $1 ";" }' | sh
return 2
}
update_git_for_windows "$@"