| Commit message (Collapse) | Author | Age | Files | Lines |
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The new zstd compression support for squashfs modules allows for a much
snappier system because zstd decompression is 5 times faster than that of
xz (see https://sourceforge.net/p/squashfs/mailman/message/35989805/), but
at the expense of ISO sizes that are at least 10% bigger. The latter means
that we have to do some more pruning of the XFCE and PLASMA5 images to make
these fit in a CDROM and DVD image, respectively.
Here are some initial benchmarks with PLASMA5 Live ISO images,
booting in QEMU (times are in minutes:seconds):
Stage ZSTD XZ
---------------------------------------
Boot to runlevel 4 start 0:39 0:50
SDDM Login Manager visible 0:55 1:26
Plasma5 desktop ready 1:42 3:17
I also tested two of the bigger applications, measuring the time between
entering the command in a terminal and having a usable application window:
Stage ZSTD XZ
----------------------------------------
LO Writer window visible 0:17 0:34
Chromium window visible 0:09 0:14
It is obvious that a big Desktop Environment like Plasma5 where a lot of
binaries have to be loaded from their squashfs modules benefits a lot
from zstd, because after booting, the Plasma5 DE is available in
roughly 53% of the time it takes when using xz compression.
Zstd support in squashfs was added to Linux kernel 4.14. That means,
no customimzation of Slackware is required to make the Live OS work from
zstd-compressed squashfs modules.
In order to *create* these zstd-compressed squashfs modules, you will need
some custom packages at the moment, until they get added to Slackware-current:
zstd and a rebuild squashfs-tools to add the lacking zstd support to
mksqhashfs/unsquashfs.
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The old use of 'installpkg' prevented upgrading an already present package
while 'upgradepkg --install-new' allows for all options.
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Also, split 'x_base' into 'noxbase' and 'x_base' so that in future
we can create a 'rescue' option using just 'min' and 'noxbase'.
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This will provide compression ratios approaching those of xz,
while achieving decompression rations similar to lzo (5 times faster
than xz).
We will need to have a zstd package in Slackware first, and then
rebuild squashfs-tools to add zstd support.
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If we use 'testing' repository to get the Plasma 5 packages, then the
slackpkg/slackpkg+ configuration should reference that 'testing' URL
as well, to avoid confusion when the user runs 'slackpkg upgrade-all'.
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The order in which the squashfs modules were created should be respected
when they are re-assembled to an overlay filesystem.
The assembly is done in lexicographical order - therefore xbase.lst
needed to be renamed to x_base.lst.
Failing to adhere to the original assembly order causes weirdness.
In my case it meant that the complete directory /usr/share/applications
as contained in xapbase.lst was invisible in the resulting overlay, causing
near-empty menus in XFCE.
Also added several packages to x_base.lst that are now part of Slackware.
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Group membership of 'input' is needed to access input devices that are
exposed through libinput (touch devices are only exposed through libinput)
and seems to be a requirement for Wayland.
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There are no KDE4 packages left in the latest Plasma 5 releases.
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A pkglist has a certain syntax:
- Lines starting with '#' are considered comments and are ignored.
- Empty lines will be ignored.
- A line not containing '%' is considered to name a single package
to install/upgrade.
- Two strings separated by '%' are considered as 'old' and 'new' package
where the old package will be upgraded by the new package.
This is useful in situations where the package names differ (udev -> eudev).
- One string with '%' at the end is considered a package removal request.
The string in front of the '%' is the package name to be removed.
This syntax was added in liveslak-1.1.9.3.
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This way you can check in a pinch whether your new ISO will fit or not.
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CACert should be a trusted CA to avoid discomforting warnings about
'untrusted' certificate when visiting my future blog location.
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Purpose: to update the content of a Slackware Live USB stick.
upslak.sh accepts the following parameters:
-b|--nobackup Do not try to backup original kernel and modules.
-d|--devices List removable devices on this computer.
-h|--help This help.
-i|--init <filename> Replacement init script.
-k|--kernel <filename> The kernel file (or package).
-m|--kmoddir <name> The kernel modules directory (or package).
-n|--netsupport Add network boot support if not yet present.
-o|--outdev <filename> The device name of your USB drive.
-p|--persistence Move persistent data into new Live module.
-r|--restore Restore previous kernel and modules.
-s|--scan Scan for insertion of new USB device instead of
providing a devicename (using option '-o').
-v|--verbose Show verbose messages.
-w|--wait<number> Add <number> seconds wait time to initialize USB.
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Dhcpcd is for NFS root support.
Adding it outside of the network kernel module loop allows us
to update the kernel modules separately and more easily.
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The XFCE ISO is meant to fit on a CDROM medium.
CDROM ISO images must be at most 737.280.000 bytes (703 MB).
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We will use our own copy of syslinux files only as a fallback,
because it is safer to use the versions of files that come
with syslinux on the computer which runs iso2usb.sh.
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The 'upslak.sh' script will be added in the near future, it allows
(among others) to upgrade the liveslak kernel and its modules
on your liveslak USB stick.
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Normally there should not be .new files, but recently there was a bug
in ap/cgmanager where the .new files were not moved to their final spot.
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Yet more aggressive pruning of unneeded files (documentation mostly).
Packages that were (re-)added:
min/ghostscript
min/libedit
min/libidn2
xbase/SDL2
xbase/SDL2_gfx
xbase/SDL2_image
xbase/SDL2_mixer
xbase/SDL2_net
xbase/SDL2_ttf
xbase/libbluray
xbase/ocl-icd
Packages that were removed:
min/elvis
min/lilo
xapbase/xpaint
xbase/djvulibre
xbase/gtk+
xbase/liberation-fonts-ttf
xbase/xv
xfce/orage
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Adding 'sdhci-pci:sdhci-acpi' to KMODS is needed to make liveslak boot
off a Dell e7440 with O2 Micro, Inc. Integrated MMC/SD Controller.
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