...and some smaller fixes:
* make the diff output easier to read
* verify, that only .apk, .buildinfo.json and the APKINDEX have
changed inside the local repository folder. Because the file
names of these changes will be used to release files from
staging to release.
* 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.
Oliver Smith