Package: mmdebstrap
Version: 0.5.0-1
Severity: wishlist
File: /usr/bin/mmdebstrap

It would cool if I could do an unprivileged mmdebstrap and get a .squashfs 
instead of a tarball.

Sales pitch:

    squashfs is a file format that can act both like an archive (replaces 
        unsquashfs -d foo/ foo.sq
    and like a block device (replaces .iso):
        sudo mount -o loop foo.sq foo/

    squashfs-tools 4.4 understands SOURCE_DATE_EPOCH (reproducible builds).

    Unlike .tar.xz, it is possible to list of extract a subtree without 
decompressing the whole thing.

    Unlike (some versions of) tar, it has sensible defaults, so you do
    not get burned by forgetting --numeric-owner.

    Debian Live images are squashfs-based for about a decade.

I can't read perl very well anymore, so it's not clear to me how to actually 
patch this support in.
Looking at references to "@taropts", it seems like tar gets called about 4 
times, and
you'd need an equivalent "mksquashfs" in each one of those cases?  Yuk.

For reference, a basic usage is:

    mksquashfs foo/ foo.squashfs

And a complicated horrible usage is (in bash):

    # NB: with -regex, each path component is matched as a separate, 
*unanchored* ERE.
    # If you just pass 'usr/share/info/', it will also exclude 
        # Since boot/* is needed outside the squashfs, don't duplicate it 
        # Filesystems created at boot time.
        # Cryptographic keys MUST NOT be baked in.
        # Build-time configuration and cache.
        # No documentation (safety net for dpkg.cfg.d/75no-docs).
    mksquashfs target/ target/boot/filesystem.squashfs -b 1M -comp xz -Xbcj x86 
-Xdict-size 100% -no-recovery -regex -e "${exclusions[@]}"

-- System Information:
Debian Release: 10.1
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'stable-updates'), (500, 
'proposed-updates'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-6-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages mmdebstrap depends on:
ii  apt       1.8.2
ii  perl      5.28.1-6
ii  perl-doc  5.28.1-6

Versions of packages mmdebstrap recommends:
ii  arch-test          0.15-2
ii  fakechroot         2.19-3.2
ii  fakeroot           1.23-1
ii  mount              2.33.1-0.1
ii  pseudo [fakeroot]  1.9.0+git20180920-1
ii  uidmap             1:4.5-1.1

Versions of packages mmdebstrap suggests:
pn  binfmt-support    <none>
ii  dpkg-dev          1.19.7
ii  proot             5.1.0-1.3
pn  qemu-user         <none>
pn  qemu-user-static  <none>

-- no debconf information

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