[pve-devel] [RFC storage] content-dirs: check that all content dirs are pairwise inequal

[Friedrich Weber <f.weber@proxmox.com>]

This prevents strange interactions in case the same content directory
is used for multiple content types.

Signed-off-by: Friedrich Weber <f.weber@proxmox.com>
---
 I guess technically this is a breaking change, as users may have an
 iso+vztmpl storage that symlinks 'templates/iso' to 'templates/cache',
 which would now throw an error.

 PVE/Storage/Plugin.pm | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/PVE/Storage/Plugin.pm b/PVE/Storage/Plugin.pm
index c323085..3c9a179 100644
--- a/PVE/Storage/Plugin.pm
+++ b/PVE/Storage/Plugin.pm
@@ -3,6 +3,7 @@ package PVE::Storage::Plugin;
 use strict;
 use warnings;
 
+use Cwd qw(abs_path);
 use Encode qw(decode);
 use Fcntl ':mode';
 use File::chdir;
@@ -1362,6 +1363,16 @@ sub activate_storage {
 	"directory '$path' does not exist or is unreachable\n";
     }
 
+    # check that content dirs are pairwise inequal
+    my $resolved_subdirs = {};
+    if (defined($scfg->{content})) {
+	foreach my $vtype (keys $scfg->{content}->%*) {
+	    my $abs_subdir = abs_path($class->get_subdir($scfg, $vtype));
+	    die "storage '$storeid' uses directory $abs_subdir for multiple content types\n"
+		if defined($resolved_subdirs->{$abs_subdir});
+	    $resolved_subdirs->{$abs_subdir} = 1;
+	}
+    }
 
     return if defined($scfg->{mkdir}) && !$scfg->{mkdir};
 
-- 
2.30.2