[PATCH 5/5] Add a self-update mechanism for setup.exe

Christopher Faylor cgf-use-the-mailinglist-please@cygwin.com
Sun Apr 24 16:18:00 GMT 2011

On Sun, Apr 24, 2011 at 02:05:57PM +0100, Jon TURNEY wrote:
>Updating setup.exe has 3 stages:
>1) Download updated setup.exe to a temporary location
>2) Execute that temporary copy of setup.exe with --copy-to instructing
>it to copy itself over the setup.exe to be updated
>3) Execute the updated setup.exe with --remove-from instructing it
>to delete the temporary copy
>A named mutex is used to ensure setup exits from each stage before
>the next stage can start.
>Unfortunately, at the moment, we don't usefully check the setup version number
>until after we have downloaded and parsed setup.ini, which is perhaps a bit
>late to offer to update setup.exe
>v2: Address comments from Dave Korn
>Properly quote arguments to ensure spaces in paths are handled safely
>Place the setup URL in a string resouce
>2011-03-29  Jon TURNEY  <jon.turney@dronecode.org.uk>
>	* res.rc (IDS_OLD_SETUP_VERSION): Change text to offer to download
>	new version of setup.
>	(IDS_SETUP_URL): Added string resource.
>	* resource.h (IDS_SETUP_URL): Added resource identifier.
>	* main.cc (wait_for_exit, self_update_remove_from,
>	self_update_copy_to, WinMain): Add -copy-to and --remove-from options
>	for self-update process.
>	* ini.cc (self_update_download): New function to download updated
>	setup.
>	(do_ini_thread): Prompt to download updated setup if a newer
>	version exists.  Return a result indicating what should happen
>	next.
>	* threebar.h (PropertyPage::OnFinish): Add an implementation of
>	OnFinish virtual function for this class.
>	* threebar.cc (OnFinish): Ditto.
>	 (OnMessageApp): Setup should finish on WM_APP_SETUP_INI_DOWNLOAD_COMPLETE
>	if an updated setup was downloaded.
>2011-03-29  Jon TURNEY  <jon.turney@dronecode.org.uk>
>	* include/getopt++/DefaultFormatter.h (DefaultFormatter): Fix option string
>	formatting when it has no short option.

Sounds wonderful but couldn't you just rename the original setup.exe out
of the way, copy a new version over it in place, and then re-execute?


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