always download changelogs into /tmp first

pkgAcqChangelog has the default behaviour of downloading a changelog to
a temporary directory (inside /tmp, not /tmp directly), which is cleaned
up on shutdown, but this can be overridden to store the changelog more
permanently – but that caries a permission problem.

For changelog we can 'easily' solve this by always downloading to a
temporary directory and only move it out of there on done.

1 files changed, 2 insertions, 1 deletions

diff --git a/apt-pkg/acquire-item.h b/apt-pkg/acquire-item.h
index 306b1772a..61f64c3a9 100644
--- a/apt-pkg/acquire-item.h
+++ b/apt-pkg/acquire-item.h
@@ -1055,7 +1055,8 @@ class pkgAcqArchive : public pkgAcquire::Item
  */
 class pkgAcqChangelog : public pkgAcquire::Item
 {
-   void * const d;
+   class Private;
+   Private * const d;
    std::string TemporaryDirectory;
    std::string const SrcName;
    std::string const SrcVersion;