xmlsecurity: nsscrypto_initialize: try to avoid profile migration

https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.35_release_notes

NSS 3.35 and later will automatically migrate migrate profiles from the
old "dbm:" BDB format to the new "sql:" SQLite format.

The new format can be read by NSS 3.12 and later, which is old enough that
it can be assumed to be available.

However LibreOffice still shouldn't migrate the profile on its own:
LO typically uses a Mozilla Firefox or Thunderbird profile, and if it is
a system Firefox with system NSS libraries, then it's probably a bad
idea for LO to migrate the profile under Firefox's nose, particularly
considering the "partial migration" scenario if the profile is
password-protected.

Try to avoid this by checking if the profile is the old format and
explicitly using the "dbm:" prefix to prevent the migration.

Change-Id: I06480522f830ce74e2fb7bf79fee84ad80979b82
Reviewed-on: https://gerrit.libreoffice.org/58756
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

xmlsecurity/source/xmlsec/nss/nssinitializer.cxx

@@ -244,6 +244,20 @@ bool nsscrypto_initialize( const css::uno::Reference< css::uno::XComponentContex
     // there might be no profile
     if ( !sCertDir.isEmpty() )
     {
+        if (sCertDir.indexOf(':') == -1) //might be env var with explicit prefix
+        {
+            OUString sCertDirURL;
+            osl::FileBase::getFileURLFromSystemPath(
+                OStringToOUString(sCertDir, osl_getThreadTextEncoding()),
+                sCertDirURL);
+            osl::DirectoryItem item;
+            if (osl::FileBase::E_NOENT != osl::DirectoryItem::get(sCertDirURL + "/cert8.db", item) &&
+                osl::FileBase::E_NOENT == osl::DirectoryItem::get(sCertDirURL + "/cert9.db", item))
+            {
+                SAL_INFO("xmlsecurity.xmlsec", "nsscrypto_initialize: trying to avoid profile migration");
+                sCertDir = "dbm:" + sCertDir;
+            }
+        }
         if( NSS_InitReadWrite( sCertDir.getStr() ) != SECSuccess )
         {
             SAL_INFO("xmlsecurity.xmlsec", "Initializing NSS with profile failed.");