[pve-devel] [PATCH manager] ceph install: improve ceph install checks during installation

[Aaron Lauterer <a.lauterer@proxmox.com>]

Adding a lock file during the Ceph installation helps to cover the time
span in which the binary is already present but the installation not yet
done.

The most noticeable effect is that the 'Next' button in the GUI will
only become active once the installation is actually finished and not
earlier.

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
---

I don't know if the file creation could be done nicer than using open
and close.

If the lock file /var/run/lock/ceph_install.lck is created before ceph
is installed, there is no effect. If it is created after Ceph has been
installed, the user is prompted by the install dialog once more, but apt
will be done right away.

 PVE/CLI/pveceph.pm | 9 +++++++++
 PVE/Ceph/Tools.pm  | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/PVE/CLI/pveceph.pm b/PVE/CLI/pveceph.pm
index 356af282..3bee3413 100755
--- a/PVE/CLI/pveceph.pm
+++ b/PVE/CLI/pveceph.pm
@@ -177,7 +177,14 @@ __PACKAGE__->register_method ({
 	);
 
 	print "start installation\n";
+
+	my $install_lock_file = '/var/lock/ceph_install.lck';
+	open(INSTALL_LOCK, ">${install_lock_file}") ||
+	     die "could not lock Ceph installation\n";
+	close INSTALL_LOCK;
+
 	if (system(@apt_install, @ceph_packages) != 0) {
+	    unlink $install_lock_file;
 	    die "apt failed during ceph installation ($?)\n";
 	}
 
@@ -188,6 +195,8 @@ __PACKAGE__->register_method ({
 	    'systemctl', 'try-reload-or-restart', 'pvedaemon.service', 'pveproxy.service'
 	]);
 
+	unlink $install_lock_file;
+
 	return undef;
     }});
 
diff --git a/PVE/Ceph/Tools.pm b/PVE/Ceph/Tools.pm
index f54d837a..18133d65 100644
--- a/PVE/Ceph/Tools.pm
+++ b/PVE/Ceph/Tools.pm
@@ -155,7 +155,9 @@ sub check_ceph_installed {
 
     $service = 'ceph_bin' if !defined($service);
 
-    if (! -x $ceph_service->{$service}) {
+    # ceph_install.lck is checked to cover the time where the binary is already
+    # present, but the installation not yet done
+    if (! -x $ceph_service->{$service} || -e '/var/lock/ceph_install.lck') {
 	die "binary not installed: $ceph_service->{$service}\n" if !$noerr;
 	return undef;
     }
-- 
2.30.2