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Groups > linux.debian.bugs.dist > #763684

Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link

Cross-posted to 2 groups.

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Package: dpkg
Version: 1.18.10
Severity: normal

Hi,

overlayfs does not support renaming directories when the directories
live in the lower filesystem:

 * Directory renames only allowed on "pure upper" (already created on
 * upper filesystem, never copied up).  Directories which are on lower or
 * are merged may not be renamed.  For these -EXDEV is returned and
 * userspace has to deal with it.  This means, when copying up a
 * directory we can rely on it and ancestors being stable.

https://github.com/torvalds/linux/blob/v4.8-rc2/fs/overlayfs/copy_up.c#L318-L322

Unfortunately this means that dpkg fails at least in the case where a
directory is converted into a file: apt 1.3~rc2 moves
/usr/share/bug/apt/script to /usr/share/bug/apt . This causes dpkg to
fail when running in an overlayfs with the following error:

# dpkg -i /var/cache/apt/archives/apt_1.3~rc3_amd64.deb 
(Reading database ... 11401 files and directories currently installed.)
Preparing to unpack .../archives/apt_1.3~rc3_amd64.deb ...
Unpacking apt (1.3~rc3) over (1.3~rc2) ...
dpkg: error processing archive
/var/cache/apt/archives/apt_1.3~rc3_amd64.deb (--install):
 unable to move aside './usr/share/bug/apt' to install new version: Invalid cross-device link
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for libc-bin (2.23-5) ...
Errors were encountered while processing:
 /var/cache/apt/archives/apt_1.3~rc3_amd64.deb

I don't know what the correct workaround should be.

This can break pre-build upgrades in sbuild when the schroot is of
overlayfs type.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dpkg depends on:
ii  libbz2-1.0   1.0.6-8
ii  libc6        2.23-5
ii  liblzma5     5.1.1alpha+20120614-2.1
ii  libselinux1  2.5-3
ii  tar          1.29b-1
ii  zlib1g       1:1.2.8.dfsg-2+b1

dpkg recommends no packages.

Versions of packages dpkg suggests:
ii  apt  1.3~rc3

-- no debconf information

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Thread

Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Felipe Sateler <fsateler@debian.org> - 2016-08-31 17:20 +0200
  Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Johannes Schauer <josch@debian.org> - 2016-09-01 09:10 +0200
    Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Felipe Sateler <fsateler@debian.org> - 2016-09-01 13:30 +0200
  Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Raphael Hertzog <hertzog@debian.org> - 2016-09-02 13:40 +0200
    Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Miklos Szeredi <miklos@szeredi.hu> - 2016-09-02 14:40 +0200
      Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Guillem Jover <guillem@debian.org> - 2016-09-02 15:10 +0200
        Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Miklos Szeredi <miklos@szeredi.hu> - 2016-09-05 10:40 +0200
  Bug#836211: dpkg: Cannot upgrade some packages on overlayfs: Invalid cross-device link Raphael Hertzog <hertzog@debian.org> - 2016-09-02 17:00 +0200

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