[Bug 1358350] [NEW] search for eatmydata only searches root , not in target

[Scott Moser]

Public bug reported:

util.install_packages tries to determine if 'eatmydata' is available in the target, but inadvertently only checks in the host.
this results in:

chroot: failed to run command 'eatmydata': No such file or directory
Unexpected error while running command.
Command: ['chroot', '/tmp/tmp75AQEC/target', 'eatmydata', 'apt-get', 'install', '--quiet', '--assume-yes', '--option=Dpkg::options::=--force-uns
afe-io', 'linux-generic-lts-trusty']
Exit code: 127

The issue is use of os.path.join():

$ python -c 'import os.path; print(os.path.join("/target", "/usr/sbin", "foo"));'
/usr/sbin/foo

** Affects: curtin
     Importance: Undecided
         Status: New

** Affects: curtin (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: curtin
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1358350

Title:
  search for eatmydata only searches root , not in target

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