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Host's /etc/abuild.conf may enable USE_CCACHE which will pull in ccaches
as makedepends which breaks the tests.

fixes #10017

By default, fakeroot forwards chown system calls to the libc and ignores
EPERM errors. Unfortunately, when fakeroot is used inside a restricted
bubblewrap environment, bubblewrap intercepts these system calls and
returns EINVAL. The EINVAL return value is not masked by fakeroot and
returned to the caller, thereby causing failures of mv(1), install(1),
chown(1), … which use the chown system calls internally.

Setting the FAKEROOTDONTTRYCHOWN environment variable prevents the chown
systemcalls to be performed in the first place. This variable is only
set in the environment created through bubblewrap by abuild rootbld.

Fixes #10021

cargo is now generating two files: .cargo.toml and .cargo2.json.

fixes #10011

the SRCDEST may be shared by multiple builders and apparently cargo does
not seem to handle that well. There are also no good way to do clean-up
of the cache for purging things that is no longer in use.

This reverts commit af0c88e6.

This fixes issue with `abuild cleanpkg all`, which would fail to set
SOURCE_DATE_EPOC for reproducible builds.

this is required when we package stuff with compatibility to glibc like
libc6-compat

fixes #5421

fixes #9999

prefix each test output so its easier to see what is tested

ref #9999

fixes #10004

This has multiple advantages:
* It's tool agnostic (e.g. if we were to drop the ninja symlink
  for samu, we wouldn't have to change anything here)
* It allows for more fine grained control, e.g. in meson test,
  where we can increase timeouts and print the test log to stdout,
  something which we can't control when invoking it via ninja.
* We can pass --no-rebuild to test and install, so ninja doesn't
  have to check if anything has to be rebuild against in the test
  and install phase, when we built everything in the build phase
  already

This is similiar to dd24cdf8, but
for meson.

so we have buffer space for the ".part" suffix.

fix return value for usage text

fix digest to be unsigned char buffer