debootstrap is just a shell script, we don't need to check build hardening
and "any" architecture build.

provide support for Devuan release names

See merge request installer-team/debootstrap!34

as requested by parazyd@dyne.org:
  Message-Id: <20190727110900.14320-1-parazyd@dyne.org>

With many thanks for all his contributions over the years!

This reverts commit 75cd76ca.

This reverts commit dc5b669b.

Check Valid date with InRelease file

See merge request installer-team/debootstrap!21

APT checks whether a repostiroty is valid or not via "Until-Valid:" field
in InRelease file. debootstrap should check it, too. When user explicitly
want to ignore it (e.g. use snapshot.debian.org), specify --ignore-repo-expire
option.

Speed up (Bug#871835)

See merge request installer-team/debootstrap!19

#914208: Disable merged /usr by default when making a buildd chroot

See merge request installer-team/debootstrap!23

Merged /usr is known to cause multiple packages to be misbuilt. As long
as we support unmerged /usr for user systems, we should mitigate
this class of bugs by using unmerged-/usr chroots on official buildds,
resulting in binary packages that work equally well on merged- or
unmerged-/usr user systems.

See also:

* https://bugs.debian.org/913229
* https://udd.debian.org/cgi-bin/bts-usertags.cgi?user=md@linux.it&tag=usrmerge
* thread starting at https://lists.debian.org/debian-devel/2018/11/msg00299.html



Signed-off-by: Simon McVittie <smcv@debian.org>
Bug: https://bugs.debian.org/914208

Among the scripts that were dropped in
8ab54a91

 are the scripts of Debian
derivatives. This means that derivatives would have to rebuild
the package to have a working installer. This is rather unfriendly
for derivatives that make the effort to have their script merged
in the official debootstrap package.

The few kilobytes saved are not worth the trouble, thus we simply
keep all the script files that are provided.

This change thus restores the possibility for derivatives to use the udeb
built by Debian.

Related to #893713.

Acked-by: Cyril Brulebois <kibi@debian.org>