[pve-devel] [PATCH v3 container 1/2] Fix #1924: add snapshot parameter

[Rhonda D'Vine]

The config CLI command offer the config and showcmd functions. The
output of that may vary with respect to a given snapshot. This adds a
switch that shows the corresponding snapshot's config.

This patch needs the one in pve-guest-common applied first, and have the
versioned dependency in debian/rules adjusted.

Signed-off-by: Rhonda D'Vine <rhonda at proxmox.com>
---
 debian/control             |  2 +-
 src/PVE/API2/LXC/Config.pm | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/debian/control b/debian/control
index 15f42ad..42a07df 100644
--- a/debian/control
+++ b/debian/control
@@ -4,7 +4,7 @@ Priority: extra
 Maintainer: Proxmox Support Team <support at proxmox.com>
 Build-Depends: debhelper (>= 7.0.50~),
                libpve-common-perl,
-               libpve-guest-common-perl | libpve-common-perl (<= 4.0-89),
+               libpve-guest-common-perl (>> 2.0-18) | libpve-common-perl (<= 4.0-89),
                libpve-storage-perl,
                libtest-mockmodule-perl,
                lxc (>= 3.0.2-1) | lxc-pve (>= 3.0.1+pve1-1),
diff --git a/src/PVE/API2/LXC/Config.pm b/src/PVE/API2/LXC/Config.pm
index 1ba0ffd..3ea3111 100644
--- a/src/PVE/API2/LXC/Config.pm
+++ b/src/PVE/API2/LXC/Config.pm
@@ -35,6 +35,14 @@ __PACKAGE__->register_method({
 	properties => {
 	    node => get_standard_option('pve-node'),
 	    vmid => get_standard_option('pve-vmid', { completion => \&PVE::LXC::complete_ctid }),
+	    snapshot => get_standard_option('pve-snapshot-name', {
+		description => "Fetch config values from given snapshot.",
+		optional => 1,
+		completion => sub {
+		    my ($cmd, $pname, $cur, $args) = @_;
+		    PVE::LXC::Config->snapshot_list($cur->[0]);
+		},
+	    }),
 	},
     },
     returns => {
@@ -57,6 +65,17 @@ __PACKAGE__->register_method({
 
 	my $conf = PVE::LXC::Config->load_config($param->{vmid});
 
+	my $snapname = $param->{snapshot};
+	if ($snapname) {
+	    my $snapshot = $conf->{snapshots}->{$snapname};
+	    die "snapshot '$snapname' does not exist\n"
+		if !defined($snapshot);
+
+	    # we need the digest of the file
+	    $snapshot->{digest} = $conf->{digest};
+	    $conf = $snapshot;
+	}
+
 	delete $conf->{snapshots};
 
 	return $conf;
-- 
2.11.0