272 lines
7.6 KiB
Bash
272 lines
7.6 KiB
Bash
#!/bin/sh
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# Compares the currently installed Git for Windows against latest available
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# release. If versions differ, the bit matched installer is downloaded and run
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# when confirmation to do so is given.
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# Compare version strings
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# Prints -1, 0 or 1 to stdout
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version_compare () {
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a="$1"
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b="$2"
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while true
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do
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test -n "$b" || { echo 1; return; }
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test -n "$a" || { echo -1; return; }
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# Get the first numbers (if any)
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a1="$(expr "$a" : '^\([0-9]*\)')"; a="${a#$a1}"
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b1="$(expr "$b" : '^\([0-9]*\)')"; b="${b#$b1}"
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if test -z "$b1"
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then
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test -z "$a1" || { echo 1; return; }
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a1=0
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b1=0
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fi
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test -n "$a1" || { echo -1; return; }
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test $a1 -le $b1 || { echo 1; return; }
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test $b1 -le $a1 || { echo -1; return; }
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# Get the next character
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a1="$(expr "$a" : '^\(.\)')"; a="${a#$a1}"
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b1="$(expr "$b" : '^\(.\)')"; b="${b#$b1}"
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test "x$a1" = "x$b1" || {
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if test . = "$b1"
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then
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echo -1
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else
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echo 1
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fi
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return
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}
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test . = "$a1" || { echo 0; return; }
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done
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}
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# Counts how many Bash instances are running, apart from the current one (if
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# any: `git update-git-for-windows` might have been called from a CMD window,
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# in which case no Git Bash might be running at all).
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#
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# This is a little tricky, as the /usr/bin/sh process (as which `ps` reports the
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# process running this script) is an MSYS2 one, but the calling `git.exe`
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# process is a pure Win32 one. As a consequence, the former process' PPID will
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# be reported as 1 (!!!) and its PGID will refer to the latter, while the
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# latter's PGID will be identical to its PID and its PPID refers to the calling
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# Bash (or is 1, if `git.exe` was not called by an MSYS2 program).
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#
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# So we have to employ a little sed fu to parse `ps` output of the form:
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#
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# PID PPID PGID WINPID TTY UID STIME COMMAND
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# 19864 15640 19864 27996 pty0 4853009 15:58:05 /usr/bin/bash
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# 15640 1 15640 15640 ? 4853009 15:58:05 /usr/bin/mintty
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# 28128 13048 21176 28716 pty0 4853009 16:01:08 /usr/bin/ps
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# 13048 1 21176 13048 pty0 4853009 16:01:08 /usr/bin/sh
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# 21176 19864 21176 11996 pty0 4853009 16:01:08 /mingw64/bin/git
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#
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# Essentially, we are looking for the /usr/bin/sh line (in the example, PID
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# 13048), follow its PGID to the /mingw64/bin/git line (in the example, PID
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# 21176), and record the PPID of the latter as the pid of the current Bash, if
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# any. As we do not know in which order the `sh` and the `git` line appear, we
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# have to handle both orders.
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#
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# Then, we filter the `ps` output first by dropping the line with the current
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# Bash, then finally counting the remaining lines referring to a bash process.
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count_other_bashes () {
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mypid=$$ && nl='\n *' && s=' *' && p='[1-9][0-9]*' &&
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mypid="$(ps | sed -n ":1;N;
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s/.*$nl$mypid$s$p$s\\($p\\) .*$nl\\1$s\\($p\\) .*/\\2/p;
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s/.*$nl\\($p\\)$s\\($p\\) .*$nl$mypid$s$p$s\\1 .*/\\2/p;
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b1")"
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ps |
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if test -z "$mypid"; then cat; else grep -v "^ *$mypid "; fi |
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grep ' /usr/bin/bash$' |
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wc -l
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}
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# The main function of this script
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update_git_for_windows () {
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proxy=$(git config --get http.proxy)
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if test -n "$proxy"
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then
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export https_proxy="$proxy"
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echo "Using proxy server $https_proxy detected from git http.proxy" >&2
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fi
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yn=
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use_gui=
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quiet=
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testing=
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while test $# -gt 0
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do
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case "$1" in
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-\?|--?\?|-h|--help) ;;
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-y|--yes) yn=y; shift; continue;;
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-g|--gui) use_gui=t; shift; continue;;
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--quiet) quiet=t; shift; continue;;
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--testing) testing=t; shift; continue;;
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*) echo "Unknown option: $1" >&2;;
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esac
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printf >&2 '%s\n%s\n\t%s\n\t%s\n' \
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"Usage: git update-git-for-windows [options]" \
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"Options:" \
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"-g, --gui Use GUI instead of terminal to prompt" \
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"-y, --yes Automatic yes to download and install prompt"
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return 1
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done
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case "$(uname -m)" in
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x86_64) bit=64;;
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*) bit=32;;
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esac
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try_toast=
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test -z "$use_gui" ||
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case "$(uname -s)" in
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*-6.[23]|*-10.0)
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# Only try to show a Toast notification on Windows 8 & 10,
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# and only if we have a working wintoast.exe
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! type wintoast.exe >/dev/null 2>&1 ||
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try_toast=t
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;;
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esac
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releases_url=https://api.github.com/repos/git-for-windows/git/releases
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releases=$(curl --silent $releases_url/latest) ||
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case $?,"$proxy" in
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7,)
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proxy="$(proxy-lookup.exe https://api.github.com)" &&
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test -n "$proxy"
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export https_proxy="$proxy" &&
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echo "Using proxy $https_proxy as per lookup" >&2 &&
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releases=$(curl --silent $releases_url/latest) ||
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return
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;;
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*)
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return
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;;
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esac
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latest=$(echo "$releases" |
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grep '"tag_name": "v' |
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sed -E 's/.*"tag_name": "v([^"]*).*/\1/')
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# Did we ask about this version already?
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recently_seen="$(git config --global winUpdater.recentlySeenVersion)"
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test -n "$quiet" && test "x$recently_seen" = "x$latest" && return
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version=$(git --version | sed "s/git version //")
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echo "Git for Windows $version (${bit}bit)" >&2
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if test -z "$testing" && test "$latest" = "$version"
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then
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echo "Up to date" >&2
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git config --global winUpdater.recentlySeenVersion "$latest"
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return
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fi
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test -n "$testing" ||
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case "$version" in
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*.rc[1-9]*)
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# Do not downgrade from -rc versions to the latest stable one
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if test 0 -lt "$(version_compare "$version" "$latest")"
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then
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return
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fi
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;;
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esac
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echo "Update $latest is available" >&2
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download=$(echo "$releases" |
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grep '"browser_download_url": "' |
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grep "$bit\-bit\.exe" |
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sed -E 's/.*": "([^"]*).*/\1/')
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filename=$(echo "$download" | sed -E 's/.*\/([^\/]*)$/\1/')
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name="$(echo "$releases" | sed -n 's/^ "name": "\(.*\)",$/\1/p')"
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installer=$(mktemp -t gfw-install-XXXXXXXX.exe)
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if test -z "$yn"
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then
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other_bashes=$(count_other_bashes)
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if test $other_bashes -le 0
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then
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warn=
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elif test $other_bashes -eq 1
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then
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warn=" (killing one Git Bash)"
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else
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warn=" (killing $other_bashes Git Bash instances)"
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fi
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if test -n "$try_toast"
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then
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wintoast.exe --appname "Git for Windows" \
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--appid GitForWindows.Updater \
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--image /mingw$bit/share/git/git-for-windows.ico \
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--text "Download and install $name$warn?" \
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--action Yes --action No --expirems 15000
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case $? in
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0|16)
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# clicked toast, or clicked Yes: download
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;;
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1|17)
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# dismiseed, or clicked No: ignore this release
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git config --global \
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winUpdater.recentlySeenVersion "$latest"
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return 1
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;;
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4|5|6|9|10)
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# toast not activated, failed, toasts
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# unsupported, WinToast init failed or toast
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# not launched: fall back to using GUI
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git gui--askyesno \
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--title "Git Update Available" \
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"Download and install $name$warn?" || {
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git config --global \
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winUpdater.recentlySeenVersion "$latest"
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return 1
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}
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;;
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*)
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# toast timed out, or hidden, or unknown
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# failure: ignore
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return 1
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;;
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esac
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elif test -n "$use_gui"
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then
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git gui--askyesno --title "Git Update Available" \
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"Download and install $name$warn?" || {
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git config --global \
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winUpdater.recentlySeenVersion "$latest"
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return 1
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}
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else
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read -p "Download and install $name$warn [N/y]? " \
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yn >&2
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case "$yn" in
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[Yy]*) ;;
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*)
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git config --global \
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winUpdater.recentlySeenVersion "$latest"
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return 1;;
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esac
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fi
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else
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echo "Downloading $filename" >&2
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fi
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curl -# -L -o $installer $download || return
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start "" "$installer" /SILENT
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# Kill all Bash processes (which will let MinTTY quit, too)"
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#
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# `ps` without `-W` will automatically only catch MSYS2 processes
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# that link to *this* MSYS2 runtime, i.e. no processes from other Git
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# installations (e.g. Git for Windows' SDK) will be killed.
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ps | grep ' /usr/bin/bash$' | awk '{print "kill -9 " $1 ";" }' | sh
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}
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update_git_for_windows "$@"
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