The dib-run-parts/root.d/90-base-dib-run-parts script would mysteriously
fail whenever the dib-run-parts is not in the path. The install
commands complaining with:
install: missing destination file operand after
'/tmp/image.ILFTBYVy/mnt/usr/local/bin/dib-run-parts'
The reason is chaining a command in exec bypasses set -e. For example:
exec /bin/ls $(which doesnotexist)
Will works and continue.
Handle the which lookup in a variable to have the script abort
immediately whenever dib-run-parts is not found.
Left an inline comment to make sure the fix is kept around in the
future.
Signed-off-by: Dan Duvall <dduvall@wikimedia.org>
Change-Id: Ibb5d7342b0d06483b84f9dd567e1cc0bf90f194e
33cd0fb40f