* Two new functions for getting a list of files and their timestamps
in the repo, and diffing that information to get a list of changed
files: pmb.helpers.repo.files() and pmb.helpers.repo.diff().
(I've put it in the helpers folder, because it is not specific to
one chroot, but to all chroots at once.)
* pmbootstrap challenge (new command introduced a few commits back to
verify, that the contents of an APK file are deterministic) uses
these functions to a) support subpackages and b) optionally
output a list of changed files (this gets used in the pmbuilder
script, which lives outside of this repository).
This commit is progress for #64 again.
We have "lazy reproducible builds" now. What I mean by that is, that
the resulting "apk" archive is not fully reproducible, but all binaries
inside it are. This is necessary to kick-off the binary repo, which is
in turn required to get the testsuite going on Travis. Read #64 for more
information.
Usage:
```
pmbootstrap build hello-world --buildinfo
pmbootstrap challenge /tmp/path/to/hello-world-1-r2.apk
```
The "--buildinfo" parameter generates a "buildinfo.json", which contains
the versions of all dependencies. It is not very optimizied, so this
is a performance bottleneck and takes 10 seconds (which is quite much
considering that the hello-world package builds in less than a second).
This can be improved in the future, and then the buildinfo parameter
may become the default.
