Add support for zst compression

[mbearup]

Fixes #

Requirements

All new code should be covered with tests, documentation should be updated. CI should pass.

Description of the Change

Adds support for zst compression. This is just a re-attempt at PR #1002 since that one seems to be stalled.

Checklist

• unit-test added (if change is algorithm)
• functional test added/updated (if change is functional)
• man page updated (if applicable)
• bash completion updated (if applicable)
• documentation updated
• author name in AUTHORS

[randombenj]

Thanks for this change! Could you drop support for 1.14 as with the new package some checks seem to fail

[mbearup]

Removed 1.14 from ci.yml. Let me know if anything else I should change. Looks like CI re-run needs to be approved as well.

[randombenj]

@mbearup Thanks for the changes, could you please add a unit test for this change? Something similar to https://github.com/aptly-dev/aptly/blob/master/deb/deb_test.go#L42

[NeroBurner]

Like in #658 we can use http://ddebs.ubuntu.com/pool/universe/q/qtbase-opensource-src/libqt5concurrent5-dbgsym_5.15.2+dfsg-12_amd64.ddeb as test file for the new unit tests as it is zstd compressed

This is the official Ubuntu 21.10 impish ddeb file listed in http://ddebs.ubuntu.com/dists/impish/universe/binary-amd64/Packages for the package libqt5concurrent5-dbgsym

edit: add information from Packages about the ddeb

Package: libqt5concurrent5-dbgsym
Package-Type: ddeb
Architecture: amd64
Version: 5.15.2+dfsg-12
Auto-Built-Package: debug-symbols
Multi-Arch: same
Priority: optional
Section: debug
Source: qtbase-opensource-src
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Installed-Size: 227
Depends: libqt5concurrent5 (= 5.15.2+dfsg-12)
Filename: pool/universe/q/qtbase-opensource-src/libqt5concurrent5-dbgsym_5.15.2+dfsg-12_amd64.ddeb
Size: 212504
MD5sum: 2a061010b137959daf783d0d1c6759d2
SHA1: e88cf4434207c9971a585d868d5527c87ce0dd7f
SHA256: 756d5b6f1f5b773d9d1cee0c642dbf6e7ceb1e9af1cef5590ffb34673a62233c
SHA512: 3303d6d970233ef9065eef30ac419c8e3ac452f3a7eada857330edbf3a2c82cfe21bfd7aebf7d6e9a68912f54d3ac35ddc826151f9130e8286772ce198cce929
Description: debug symbols for libqt5concurrent5
Build-Ids: 59514d09f713f0b6c99ab4415f155d3279cddd14

edit2: add proposal for new test function using mentioned ddeb file

type DebSuite struct {
-	debFile, debFile2, debFileWithXzControl, dscFile, dscFileNoSign string
+	debFile, debFile2, debFileWithXzControl, debFileWithZstdControl, dscFile, dscFileNoSign string
}

var _ = Suite(&DebSuite{})

func (s *DebSuite) SetUpSuite(c *C) {
	_, _File, _, _ := runtime.Caller(0)
	s.debFile = filepath.Join(filepath.Dir(_File), "../system/files/libboost-program-options-dev_1.49.0.1_i386.deb")
	s.debFile2 = filepath.Join(filepath.Dir(_File), "../system/changes/hardlink_0.2.1_amd64.deb")
	s.debFileWithXzControl = filepath.Join(filepath.Dir(_File), "../system/changes/libqt5concurrent5-dbgsym_5.9.1+dfsg-2+18.04+bionic+build4_amd64.ddeb")
+	s.debFileWithZstdControl = filepath.Join(filepath.Dir(_File), "../system/changes/libqt5concurrent5-dbgsym_5.15.2+dfsg-12_amd64.ddeb")
	s.dscFile = filepath.Join(filepath.Dir(_File), "../system/files/pyspi_0.6.1-1.3.dsc")
	s.dscFileNoSign = filepath.Join(filepath.Dir(_File), "../system/files/pyspi-0.6.1-1.3.stripped.dsc")
}

func (s *DebSuite) TestGetControlFileFromDebWithZstdControl(c *C) {
	// Has control.tar.zstd archive inside.
	st, err := GetControlFileFromDeb(s.debFileWithZstdControl)
	c.Check(err, IsNil)
	c.Check(st["Version"], Equals, "5.15.2+dfsg-12")
	c.Check(st["Package"], Equals, "libqt5concurrent5-dbgsym")
}

[NeroBurner]

created a commit NeroBurner@12b829d
https://github.com/NeroBurner/aptly/tree/zstd_compression

feel free to cherry-pick/squash-merge

git remote add neroburner https://github.com/NeroBurner/aptly.git
git fetch neroburner zstd_compression
git cherry-pick neroburner/zstd_compression

or I can open a PR as well, anything that helps :)

[randombenj]

Thanks for the changes @mbearup and the original changes from @ahaswell
and for the test @NeroBurner.

[mbearup]

Thanks all for getting this across the finish line!