[Bug 1780501] Re: Traceback calling Vte.Terminal.feed_child()

[Brian Murray]

Here is a crash in terminator which occurs with the version of vte2.91
in bionic-updates:

https://errors.ubuntu.com/problem/13b5b72882f409d035b674102f45b0eae419ab2d

Here are some in guake:

https://errors.ubuntu.com/problem/a15ca647934a403f748dad5b3400f805a59a0de7 (count of 52)
https://errors.ubuntu.com/problem/8f1005750706310a47d63b1eaae0b6e823a9194f (count of 93)
https://errors.ubuntu.com/problem/6607888ac9d7c05d5785334483ea2cfe22f9e158 (count of 64)

Looking at the guake crashes I was able to recreate the crash using the
following command:

/usr/bin/guake -n -r htop -e htop

I then upgraded to the versions of gir1.2-vte-2.91, libvte-2.91-0, and
libvte-2.91-common in -proposed and those also fixed this crash.

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https://bugs.launchpad.net/bugs/1780501

Title:
  Traceback calling Vte.Terminal.feed_child()

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in vte2.91 package in Ubuntu:
  Won't Fix
Status in ubuntu-release-upgrader source package in Bionic:
  Invalid
Status in vte2.91 source package in Bionic:
  Fix Committed

Bug description:
  [Test Case]
  1) Ensure the following packages from -updates (version 0.52.2-1ubuntu1~18.04.1) are installed on an Ubuntu 18.04 system: gir1.2-vte-2.91 libvte-2.91-0 libvte-2.91-common
  2) Modify /etc/issue e.g. I changed 18.04 to 18.04.2
  3) Ensure /etc/update-manager/release-upgrades contains "Prompt=normal"
  4) Run /usr/lib/ubuntu-release-upgrader/check-new-release-gtk -d
  5) When prompted about replacing "the customized configuration file '/etc/issue'" click Keep
  6) Observe a traceback in Vte.Terminal.feed_child()

  After installing the new version of vte2.91 in -proposed you should no
  longer receive a Traceback when clicking keep during the upgrade
  process.

  [Regression Potential]
  Per laney: "The regression potential is that I messed up the upload and everything using feed* breaks."

  It'd probably be good to test guake too since it uses feed_child().

  [Original Description]
  I was upgrading from Bionic to Cosmic when I received a conffile prompt regarding /etc/update-initramfs/initramfs.conf, I clicked keep and then saw this Traceback:

  Original exception was:
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-filpk342/cosmic", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeController.py", line 1949, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeController.py", line 1912, in fullUpgrade
      if not self.doDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeController.py", line 1248, in doDistUpgrade
      res = self.cache.commit(fprogress,iprogress)
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeCache.py", line 293, in commit
      apt.Cache.commit(self, fprogress, iprogress)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 606, in commit
      pm = apt_pkg.PackageManager(self._depcache)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 569, in install_archives
      # compat with older API
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeView.py", line 229, in run
      res = os.WEXITSTATUS(self.wait_child())
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeViewGtk3.py", line 340, in wait_child
      self.update_interface()
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeViewGtk3.py", line 347, in update_interface
      InstallProgress.update_interface(self)
    File "/usr/lib/python3/dist-packages/apt/progress/base.py", line 252, in update_interface
      if err.errno != errno.EAGAIN and err.errno != errno.EWOULDBLOCK:
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeViewGtk3.py", line 276, in conffile
      self.term.feed_child("n\n", -1)
  TypeError: Vte.Terminal.feed_child() takes exactly 2 arguments (3 given)

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