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[Installer] Wait on the process that launched the update installer
The in-app updater starts the installer and only then quits itself, so the installer has to decide whether the launching process is still alive while it is running. It did that by polling powershell.exe for an image name under the install directory, which is a proxy for the real question - is the process that started me still holding its Qt DLLs mapped - and a proxy that can answer "not running" or "could not determine" while the process is very much alive. Either answer let the install carry on into the mixed Qt DLL set. Take /PID= from the command line and wait on that process handle directly: - OpenProcess with PROCESS_SYNCHRONIZE only, which is all that is needed to wait and the least likely to be refused for an unrelated reason - WaitForSingleObject for the same 60 s the name based check allows, so a client slow to flush its card database is not squeezed - Treat an unopenable handle as "already exited", which is what it means for a dead process - Cancel the upgrade if the launcher has not exited, rather than replacing files it is still using Run it before EnsureAppsNotRunning, not after: it needs no powershell.exe, so it is the one check that still works on a machine where the process lookup cannot run, and it is what lets that case keep upgrading instead of being cancelled by what was only ever a proxy for it. Keep an older client, which passes no /PID=, on the existing path. An older installer ignores /PID=, and /D= stays the last parameter either way.
This commit is contained in:
Lukas Brübach
parent
8f6fcdbe83
commit
fa081f20e1
1 changed files with 90 additions and 8 deletions
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@ -19,6 +19,8 @@ Var StaleFindHandle
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Var StaleFindName
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Var IsUpgrade
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Var AbortReason
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Var WaitPid
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Var LauncherExited
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!include LogicLib.nsh
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!include FileFunc.nsh
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@ -92,7 +94,8 @@ ${IfNot} ${Errors}
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/PORTABLE : Install in portable mode$\n\
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/S : Silent install$\n\
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/R : Silent upgrade$\n\
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/D=%directory% : Specify destination directory$\n"
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/PID=%pid% : Process to wait for before replacing files (used by the in-app updater)$\n\
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/D=%directory% : Specify destination directory$\n\"
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Quit
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${EndIf}
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@ -119,6 +122,23 @@ ${Else}
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StrCpy $ReinstallMode 0
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${EndIf}
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; /PID= carries the process id of the application that started this installer.
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; The in-app updater launches the installer and only then quits itself, so
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; without it the installer has to guess whether the launching process is still
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; alive by polling powershell.exe for an image name - a guess that can come back
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; "not running" or "could not determine" while the process is very much alive and
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; still has its Qt DLLs mapped. An older client does not pass /PID= and an older
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; installer ignores it, so both sides of the pair have to keep working.
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; Note that /D= must stay the last parameter on the command line, which is why
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; the client puts it last and this one anywhere.
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StrCpy $WaitPid ""
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StrCpy $LauncherExited 0
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ClearErrors
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${GetOptions} $9 "/PID=" $8
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${IfNot} ${Errors}
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StrCpy $WaitPid $8
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${EndIf}
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${If} $InstDir == ""
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; User did not use /D to specify a directory,
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; we need to set a default based on the install mode
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@ -138,17 +158,24 @@ ${EndIf}
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; Now that $PortableMode reflects reality, commit InstDir into the correct slot
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Call SetModeDestinationFromInstdir
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; Make sure no application instance is still running (and holding file locks)
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; before the previous version is uninstalled. On a silent update (/R /S) the
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; running processes are asked to close gracefully and waited for; Cockatrice
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; itself is never force-killed (data loss, e.g. an unsaved deck) so the update
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; is aborted instead, while the console applications Oracle and Servatrice are
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; force-stopped by PID once the grace period is over. On interactive installs
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; Wait for the process that launched this installer to exit before anything is
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; replaced or deleted. It goes first because it is the one check here that needs
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; no powershell.exe: on a machine where the process lookup cannot run at all, the
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; launcher is still proven gone here instead of the whole upgrade being cancelled
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; by a check that was only ever a proxy for this one.
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;
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; Then make sure no *other* application instance is still running (and holding
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; file locks) before the previous version is uninstalled. On a silent update
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; (/R /S) the running processes are asked to close gracefully and waited for;
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; Cockatrice itself is never force-killed (data loss, e.g. an unsaved deck) so the
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; update is aborted instead, while the console applications Oracle and Servatrice
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; are force-stopped by PID once the grace period is over. On interactive installs
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; the user is prompted to close them instead.
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; Only needed this early for /R, where AutoUninstallIfNeeded runs below; for
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; interactive installs the section re-checks after the directory page, when
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; $INSTDIR is the directory the user actually picked.
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${If} $ReinstallMode = 1
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Call WaitForLauncherToExit
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Call EnsureAppsNotRunning
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${EndIf}
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@ -467,6 +494,54 @@ Function AbortInstall
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Abort
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FunctionEnd
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; Waits for the application that launched this installer to exit, using the /PID=
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; it passed. Sets $LauncherExited to 1 when that process is provably gone.
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;
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; This is the authority for the one question the rest of the installer can only
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; approximate: is the process that started us still holding its Qt DLLs mapped?
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; A mapped module cannot be deleted, so an answer of "not running" obtained by
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; enumerating process names is what allows the update to write a new payload on
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; top of files it could not remove. Waiting on a real handle has no such gap,
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; needs no powershell.exe, and is unaffected by a process whose path cannot be
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; read - the case the name based check has to treat as "not ours" so it never
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; closes a third party application.
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;
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; Sets $LauncherExited to 0 when no usable /PID= was given, which is the older
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; client that does not pass one; the caller then has no authority available and
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; falls back to the name based guard.
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Function WaitForLauncherToExit
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StrCpy $LauncherExited 0
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${If} $WaitPid == ""
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Return
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${EndIf}
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; PROCESS_SYNCHRONIZE is the only access this needs - enough to wait on the
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; handle, and the least likely to be refused for a reason that has nothing to
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; do with the upgrade.
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ClearErrors
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System::Call 'kernel32::OpenProcess(i 0x00100000, i 0, i $WaitPid) p.r0'
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${If} $Errors
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; The launcher is gone - OpenProcess cannot open a dead process - which is
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; exactly the state the wait was for.
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DetailPrint "The application that started this installer has already exited."
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StrCpy $LauncherExited 1
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Return
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${EndIf}
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DetailPrint "Waiting for the application that started this installer to exit ..."
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; Same 60 s grace period the name based check uses, so a client that is slow
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; to flush its card database does not get less room than it used to.
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; WAIT_OBJECT_0 is 0; WAIT_TIMEOUT is 258 and a failed wait reports 0xFFFFFFFF.
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System::Call 'kernel32::WaitForSingleObject(p r0, i 60000) i.r1'
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System::Call 'kernel32::CloseHandle(p r0)'
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${If} $R1 != 0
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DetailPrint "The application that started this installer did not exit within 60 s."
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StrCpy $AbortReason \
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"The application that started this update has not exited yet, so the installation was cancelled rather than replace files it is still using.$\r$\n$\r$\nPlease close Cockatrice and run the installer again."
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Call AbortInstall
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${EndIf}
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DetailPrint "The application that started this installer has exited."
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StrCpy $LauncherExited 1
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FunctionEnd
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Function EnsureOldInstallNotRunning
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; Guards the directory of a *previous* installation, as recorded in the
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; registry. Needed by componentsPagePre, which runs the old uninstaller
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@ -499,7 +574,14 @@ Function GuardAppsNotRunning
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; instead. An interactive install can still continue: the user is at the
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; keyboard, and refusing outright would leave them with an installer that
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; can never complete.
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${If} $ReinstallMode = 1
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;
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; Unless the launcher has already been waited on directly: WaitForLauncherToExit
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; needs no powershell.exe, so when it has run, Cockatrice is known to be
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; gone and the lookup failing to run costs nothing but the Oracle and
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; Servatrice checks. An older client that passes no /PID= leaves no such
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; authority, and there the upgrade is cancelled as before.
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${If} $LauncherExited != 1
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${AndIf} $ReinstallMode = 1
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StrCpy $AbortReason \
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"The installation was cancelled because it could not check whether Cockatrice is still running, because powershell.exe could not be started.$\r$\n$\r$\nPlease close Cockatrice, Oracle and Servatrice and run the installer again."
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Call AbortInstall
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