Cyril Brulebois <k...@debian.org> (2013-09-19):
> My log said:
> | Get:140 http://ftp.fr.debian.org/debian/ unstable/main/debian-installer 
> cdebconf-newt-terminal amd64 0.22 [4,538 B]                                   
>                                          
> […]
> | Needed cdebconf-newt-terminal not found (looked in 
> apt.udeb/cache/archives/, debugudebs/)
> 
> and no such file there indeed, but some strangely-named files:
> | c

I used a breakpoint in flNotDir to detect when said udeb was being
handled. Caller was pkgAcqArchive::Done(), which extracts the filename
from the Message it receives:
| // Grab the output filename
| string FileName = LookupTag(Message,"Filename");

Showing all of Message (using gdb's “set print elements 0”):
| (gdb) p Message
| $24 = {
|   static npos = <optimized out>, 
|   _M_dataplus = {
|     <std::allocator<char>> = {
|       <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data 
fields>}, 
|     members of std::basic_string<char, std::char_traits<char>, 
std::allocator<char> >::_Alloc_hider: 
|     _M_p = 0x186b348 "201 URI Done\nURI: 
http://ftp.fr.debian.org/debian/pool/main/c/cdebconf-terminal/cdebconf-newt-terminal_0.22_amd64.udeb\nFilename:
 
/home/kibi/debian-installer/installer/build/apt.udeb/cache/archives/partial/c\nSize:
 4538\nLast-Modified: Fri, 06 Sep 2013 05:42:23 GMT\nMD5-Hash: 
20db6152fce5081fcbf49c7c08f21246\nMD5Sum-Hash: 
20db6152fce5081fcbf49c7c08f21246\nSHA1-Hash: 
fa2a40f777a2f48b9634866bc780fb059e60b2fe\nSHA256-Hash: 
c4d99ef27285f0c9090005313165627e56e0972e687af7e68c2b1d1538e2ae09\nSHA512-Hash: 
046dc9b0dbe08fd1ec54301714a452c70abb847b262a94fc9f468fff7259a542849b759e71f974ae3a878f4b04db42bf6e600bfd2090bc40eba0806a9b4e9a8c"
|   }
| }

So it appears the message is corrupted?

Now looking into the http method (ISTR ftp led to the same results),
adding a trivial clog call in there, I'm getting:
| Filename in http method: 
/home/kibi/debian-installer/installer/build/apt.udeb/cache/archives/partial/c

so it was actually set way before that, as expected DestFile.

Trying to apt-get install --print-uris, that's indeed sufficient
to exhibit the issue, no need to download/clean/playagain.

Since Owner->DestFile is used both for creating a Message and for
printing URIs, I suspect that's the one going bad. Looking at
apt-private/private-install.cc's InstallPackages(), it appears
the Fetcher is created by the PackageManager, and one then gets the
files out of there. I suspect this is what wants getting looked at.

As for reproducing the issue:
|   debcheckout debian-installer foo
|   cd foo/build
|   export DEB_HOST_ARCH=$(dpkg-architecture -qDEB_HOST_ARCH)
|   ./util/get-packages udeb acpi-modules-3.10-3-amd64-di alsa-base-udeb 
alsa-utils-udeb anna archdetect bogl-bterm-udeb brltty-udeb busybox-udeb 
cdebconf-gtk-terminal cdebconf-gtk-udeb cdebconf-newt-terminal 
cdebconf-newt-udeb cdebconf-priority cdebconf-text-udeb cdebconf-udeb 
choose-mirror choose-mirror-bin console-setup-linux-fonts-udeb 
console-setup-pc-ekmap console-setup-udeb core-modules-3.10-3-amd64-di 
crc-modules-3.10-3-amd64-di crypto-modules-3.10-3-amd64-di 
debian-archive-keyring-udeb di-utils di-utils-reboot di-utils-shell 
di-utils-terminfo download-installer env-preseed espeak-data-udeb espeakup-udeb 
ethdetect event-modules-3.10-3-amd64-di fat-modules-3.10-3-amd64-di 
fb-modules-3.10-3-amd64-di file-preseed firewire-core-modules-3.10-3-amd64-di 
fontconfig-udeb fonts-farsiweb-udeb fonts-khmeros-udeb fonts-lao-udeb 
fonts-lklug-sinhala-udeb fonts-mlym-udeb fonts-sil-abyssinica-udeb 
fonts-sil-padauk-udeb fonts-taml-udeb fonts-telu-udeb fonts-thai-tlwg-udeb 
fonts-tibetan-machine-udeb fonts-ukij-uyghur-udeb

(I suspect one can truncate the package list some more, but that's
for another day; if you're on another arch, try this command
instead, without the export: make rebuild_netboot)

Mraw,
KiBi.

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