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The same thing is already done for other scripting languages (e.g.
python).

the sleep(0) trick does not appear to work on s390x. which is okish as
worst case we end up with lock file leftovers. skip the test

Now all python packages that install python modules under
/usr/lib/pythonX.Y/site-packages will have a provider that indicates
their MAJOR (X) and MINOR (Y) versions.

pyX maps to the MAJOR version of the package, its objective is to allow
users to quickly install a python module without having to search around
for the correct package, doing `apk add py3.9:foo` will install whatever
packages provides the foo module.

The directories checked only go one level deep, so
'/usr/lib/python3.9/site-packages/date' will generate
py3:date=$pkgver-r$pkgrel.

files ending with .py also count and are added with their .py prefix
stripped away. so '/usr/lib/python3.9/site-packages/six.py' will
generate py3:six=$pkgver-r$pkgrel.

The reason for doing this is the same as creating pc:, so: and cmd:, it
is more reliable and robust to depened on what we known of what the package
provides than to try to guess via the pkgname.
Co-authored-by: Chloe Kudryavtsev <toast@toast.cafe>

If there are only empty files in the pkgdir, on some filesystems
(discovered on btrfs), du might return 0 for the sum size of the files.
But apk-tools considers packages with size = 0 to be virtual and skips
extraction of any files contained.

To work around that (until it is resolved in apk-tools 3), settings the
size to 1 when it is zero AND some files are present should work fine.

test what happens when git has no user.email configured

Simplify locking by using lockf(3). It is POSIX compatible and should
work over NFS.

Fix download race condition when:
1) host A creates lockfile and aquire lock to fetch from distfiles
   mirror
2) host B opens the lockfile and waits for lock
3) host A gets 404 from distfiles, releases lock and deletes the
   lockfile, which host A has an open file handle for
4) host B gets lock of the deleted file and downloads file
5) host A retries download and creates a new lockfile, but is not
   blocked by host B, even if it should

Solve this by releaseing the lock, give the other processes a chance
to aquire it (using sleep(0)), and then only delete the lockfile if:
a) download was successful (no 404) or b) no-one else has a lock.

This reverts commit 281720ec (abuild-fetch: aquire a second lock
using flock(2))

fixes #10026

make sure that we cover the issue #10026

so we can run specific test with make check FILTER=<what-to-test>

Subpackages can declare their own dependencies, but these should not
affect the main package.

Add a test that verifies this behaviour.

this is so we can drop the -r option in our test suite

Use ABUILD_APK_INDEX_OPTS as extra options for apk index. This is so we
can set the apk keys dir to the directory with our temporary test keys

abuild does not support it since commit 9a398eac (abuild: remove
recursive mode)

fixes #10002

fixes #10013

use the correct abuild script

fixes commit e8cfedc2 (tests: abuild: test checksum generation)

see #10027

In osme situations it might be needed to disable setfattr. Allow this
via: `SETFATTR=true abuild ...`

fixes #10027

run under `set -e` to we abort on first error

fixes #10028