[Bug 1713149] Re: resolv.conf symlink is broken after clean debootstrap

[Vinson Lee]

artful preseed installs are still failing for me because of hostname
resolutions during in-target.

After base-installer completes, the in-target installation fails to
resolve the artful repositories. The target has /etc/resolv.conf but
/etc/resolv.conf is not working or available through in-target. in-
target is missing the entire /run/systemd directory.

# chroot /target ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 39 Aug 29 22:32 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

# chroot /target ls -l /run/systemd/resolve/
total 4
-rw-r--r-- 1 root root 89 Aug 29 22:32 stub-resolv.conf

# chroot /target cat /etc/resolv.conf
search <redacted>
nameserver <redacted>

# chroot /target ls -l /run
total 12
drwxrwxrwt 2 root root 4096 Aug 29 22:30 lock
drwxr-xr-x 2 root root 4096 Aug 29 22:30 mount
drwxr-xr-x 3 root root 4096 Aug 29 22:32 systemd
-rw-rw-r-- 1 root utmp    0 Aug 29 22:30 utmp


# in-target ls -l /etc/resolv.conf
Aug 29 22:37:04 in-target: lrwxrwxrwx 1 root root 39 Aug 29 22:32 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

# in-target ls -l /run/systemd/resolve/
Aug 29 22:40:27 in-target: ls: cannot access '/run/systemd/resolve/'
Aug 29 22:40:27 in-target: : No such file or directory

# in-target cat /etc/resolv.conf
Aug 29 22:41:48 in-target: cat: /etc/resolv.conf
Aug 29 22:41:48 in-target: : No such file or directory

# in-target ls -l /run/
Aug 29 22:44:32 in-target: total 0
Aug 29 22:44:32 in-target: drwxr-xr-x 2 root root  40 Aug 29 22:26 lock
Aug 29 22:44:32 in-target: drwxr-xr-x 2 root root  60 Aug 29 22:26 mount
Aug 29 22:44:32 in-target: drwxr-xr-x 4 root root 100 Aug 29 22:30 udev

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https://bugs.launchpad.net/bugs/1713149

Title:
  resolv.conf symlink is broken after clean debootstrap

Status in resolvconf package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  In Progress

Bug description:
  Reproducer:
   - debootstrap artful artful

  Expected:
   - "chroot artful cat /etc/resolv.conf" doesn't fail.
   - /etc/resolv.conf is a symlink to something valid in /run

  Actual:
   - "chroot artful cat /etc/resolv.conf" gets you "No such file or directory"
   - /etc/resolv.conf is a symlink to "../run/resolvconf/resolv.conf"
   - "../run/resolvconf/resolv.conf" is a symlink to "../run/systemd/resolve/stub-resolv.conf" which is an invalid symlink as that points to /run/run/systemd/resolve/stub-resolv.conf" rather than "/run/systemd/resolve/stub-resolv.conf"

  This causes all LXC image creation to fail, causing autopkgtest to
  fail (as noticed by the kernel team) and has been causing all images
  to fail building on the upstream build system for the past two days.


  root at vm04:~# chroot artful ls -lh /etc/resolv.conf /run/resolvconf/
  lrwxrwxrwx 1 root root   29 Aug 25 20:20 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

  /run/resolvconf/:
  total 4.0K
  -rw-r--r-- 1 root root    0 Aug 25 20:21 enable-updates
  drwxr-xr-x 2 root root 4.0K Aug 25 20:20 interface
  lrwxrwxrwx 1 root root   39 Aug 25 20:18 resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

  root at vm04:~# chroot zesty ls -lh /etc/resolv.conf /run/resolvconf/
  lrwxrwxrwx 1 root root   29 Aug 25 20:20 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

  /run/resolvconf/:
  total 8.0K
  -rw-r--r-- 1 root root    0 Aug 25 20:20 enable-updates
  drwxr-xr-x 2 root root 4.0K Aug 25 20:20 interface
  -rw-r--r-- 1 root root  357 Aug 25 20:15 resolv.conf

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