[Improvement] Disabling xz compression step to save build time

[CaseOf]

It would be nice if we could find a way to disable the xz compression at the install step since we are extracting it just after.
Replacing it with a simple copy of files would fit our need.
@wolfbeast What is your opinion on this?

[CaseOf]

It is not necessarily something to be merged on upstream repository, we can just configure our build to avoid compression.

[jeandestouches]

Here is a patch, to replace xz with plain tar (with modification needed to extraction in ebuild)
xz compression took 29min on my 10 years old cpu, now with tar, well.. 3 seconds. (tmpfs)
Of course, best would be to entirely skip package creation.

---
 platform/system/packager/base.mk     | 4 ++--
 platform/system/packager/packager.mk | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/platform/system/packager/base.mk b/platform/system/packager/base.mk
index b475f6ed1..b12d77a82 100644
--- a/platform/system/packager/base.mk
+++ b/platform/system/packager/base.mk
@@ -243,8 +243,8 @@ PKG_INSTALLER_FILENAME = $(PKG_BASENAME).installer.exe
 PKG_GENERIC_OS = windows
 else
 # Archiver command and filename for not-windows target operating systems
-PKG_ARCHIVER_CMD = $(TAR) cfJv
-PKG_ARCHIVE_FILENAME = $(PKG_BASENAME).tar.xz
+PKG_ARCHIVER_CMD = $(TAR) cfv
+PKG_ARCHIVE_FILENAME = $(PKG_BASENAME).tar
 
 # Generic OS name when specifics aren't as important
 PKG_GENERIC_OS = unix
diff --git a/platform/system/packager/packager.mk b/platform/system/packager/packager.mk
index 22097fff3..f6275b378 100644
--- a/platform/system/packager/packager.mk
+++ b/platform/system/packager/packager.mk
@@ -88,7 +88,7 @@ archive: stage-package
 ifeq ($(OS_ARCH),WINNT)
  cd $(DIST); $(CYGWIN_WRAPPER) $(PKG_ARCHIVER_CMD) $(PKG_ARCHIVE_FILENAME) $(PKG_STAGE_DIR)
 else
- cd $(DIST); XZ_OPT=-9e $(PKG_ARCHIVER_CMD) $(PKG_ARCHIVE_FILENAME) $(PKG_STAGE_DIR)
+ cd $(DIST); $(PKG_ARCHIVER_CMD) $(PKG_ARCHIVE_FILENAME) $(PKG_STAGE_DIR)
 endif
 
 # ---------------------------------------------------------------------------------------------------------------------
-- 
2.34.1

-rw-r--r--  1 root    root    2,1G 19 mars  19:28 palemoon-30.0.0.linux-x86_64.tar

>>> Completed installing www-client/palemoon-30.0.0 into /var/tmp/portage/www-client/palemoon-30.0.0/image/

 * Final size of build directory: 12905756 KiB (12.3 GiB)
 * Final size of installed tree:   2171440 KiB ( 2.0 GiB)

     Sat Mar 19 08:03:33 2022 >>> www-client/palemoon-30.0.0
       merge time: 1 hour, 51 minutes and 57 seconds.

     Sat Mar 19 19:29:11 2022 >>> www-client/palemoon-30.0.0
       merge time: 1 hour, 22 minutes and 38 seconds.

[CaseOf]

I did push a commit for this.