if file is inaccessible for _apt, disable privilege drop in acquire

We had a very similar method previously for our own private usage, but
with some generalisation we can move this check into the acquire system
proper so that all frontends profit from this compatibility change.

As we are disabling a security feature here a warning is issued and
frontends are advised to consider reworking their download logic if
possible.

Note that this is implemented as an all or nothing situation: We can't
just (not) drop privileges for a subset of the files in a fetcher, so in
case you have to download some files with and some without you need to
use two fetchers.

1 files changed, 0 insertions, 8 deletions

diff --git a/cmdline/apt-get.cc b/cmdline/apt-get.cc
index d3b3da240..ebc8c94c2 100644
--- a/cmdline/apt-get.cc
+++ b/cmdline/apt-get.cc
@@ -629,9 +629,6 @@ static bool DoDownload(CommandLine &CmdL)
       return true;
    }
 
-   // Disable drop-privs if "_apt" can not write to the target dir
-   CheckDropPrivsMustBeDisabled(Fetcher);
-
    if (_error->PendingError() == true || CheckAuth(Fetcher, false) == false)
       return false;
 
@@ -850,9 +847,6 @@ static bool DoSource(CommandLine &CmdL)
       return true;
    }
 
-   // Disable drop-privs if "_apt" can not write to the target dir
-   CheckDropPrivsMustBeDisabled(Fetcher);
-
    // check authentication status of the source as well
    if (UntrustedList.empty() == false && AuthPrompt(UntrustedList, false) == false)
       return false;
@@ -1403,8 +1397,6 @@ static bool DoChangelog(CommandLine &CmdL)
 
    if (printOnly == false)
    {
-      // Note: CheckDropPrivsMustBeDisabled isn't needed here as the download happens in a dedicated tempdir
-
       bool Failed = false;
       if (AcquireRun(Fetcher, 0, &Failed, NULL) == false || Failed == true)
 	 return false;