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(!)see
...
NodeBuilder
...
API
...
concept
...
page
...
-
...
Writing
...
and
...
maintaining
...
update
...
tasks
...
is
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a
...
error-prone
...
and
...
also
...
boring
...
task.
...
The
...
Problem
...
The
...
main
...
problem
...
is
...
that
...
we
...
have
...
to
...
maintain
...
the
...
installation
...
and
...
update
...
procedure
...
separately.
...
While
...
we
...
implicitly
...
test
...
the
...
installation
...
process
...
we
...
rarely
...
do
...
that
...
for
...
the
...
update
...
tasks.
...
It
...
is
...
very
...
easy:
...
- to
...
- forget
...
- an
...
- update
...
- tasks
...
- write
...
- them
...
- wrongly
...
- (based
...
- on
...
- wrong
...
- assumption)
...
- write
...
- them
...
- not
...
- fain
...
- grained
...
- enough
...
- because
...
- it
...
- is
...
- time
...
- consuming
...
Potential
...
Solutions
...
Use
...
a
...
builder
...
API
...
It
...
is
...
in
...
general
...
a
...
good
...
idea
...
to
...
code
...
deltas
...
/
...
initial
...
configuration
...
by
...
using
...
a
...
content
...
builder
...
API.
...
see
...
...
A)
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Do
...
not
...
separate
...
Installation
...
/Update
...
- write
...
- the
...
- initial
...
- installation
...
- process
...
- on
...
- later
...
- installations
...
- 1.0.3
...
- execute
...
- the
...
- initial
...
- installation
...
- and
...
- the
...
- deltas
...
- on
...
- update
...
- simply
...
- execute
...
- the
...
- deltas
...
- (as
...
- today)
...
This
...
works
...
as
...
long
...
the
...
deltas
...
are
...
small
...
enough.
...
But
...
there
...
is
...
a
...
tricky
...
thing
...
to
...
consider:
...
that
...
each
...
module
...
executes
...
the
...
complete
...
chain
...
and
...
only
...
then
...
the
...
next
...
modules
...
update
...
tasks
...
are
...
executed.
...
This
...
can
...
lead
...
to
...
unwanted
...
side
...
effects
...
if
...
one
...
delta
...
depends
...
on
...
a
...
former
...
state
...
from
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an
...
other
...
module.
...
B)
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Generate
...
the
...
delta
...
code
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We
...
could
...
have
...
a
...
tool
...
which
...
can
...
generate
...
the
...
update
...
code
...
(using
...
the
...
builder
...
API)
...
based
...
on
...
either
...
two
...
repository
...
states
...
or
...
two
...
bootstrap
...
files.
...
- this
...
- ensures
...
- that
...
- nothing
...
- gets
...
- forgotten
...
- tasks
...
- are
...
- fine
...
- grained
...
- easier
...
- to
...
- verify
it's
...
- too
...
- easy
...
- to
...
- make
...
- mistakes
...
- by
...
- relying
...
- too
...
- much
...
- on
...
- such
...
- a
...
- tool
...
- (i.e.
...
- the
...
- tool
...
- can't
...
- know
...
- if
...
- a
...
- property
...
- has
...
- been
...
- renamed
...
- ("template"
...
- /
...
- "templatePath")
...
- or
...
- dropped
...
- and
...
- another
...
- one
...
- was
...
- added
...
- (i.e
...
- if
...
- it
...
- should
...
- keep
...
- the
...
- value
...
- or
...
- not)
...