This bug was fixed in the package livecd-rootfs - 2.408.25
---
livecd-rootfs (2.408.25) xenial; urgency=medium
* Sort and list dependencies nicely
* Depend on packages instead of installing them at run time
* Use xz -T4 instead of pxz.
Supported xz versions before 5.2
Verified by building cloud images using the proposed package and
ensuring the resulting artifacts were satisfactory.
** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial
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(verified with 2.408.25)
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https://bugs.launchpad.net/bugs/1701132
Title:
Please use xz instead of pxz
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Hello Balint, or anyone else affected,
Accepted livecd-rootfs into xenial-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.408.25 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
** Changed in: livecd-rootfs (Ubuntu Xenial)
Status: In Progress => Fix Committed
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Title:
Please use xz instead of pxz
To manage
** Description changed:
[Impact]
- * Livecd-rootfs switches from using pxz to xz
- * Pxz is installed at run-time instead of being a package dependency and pxz
is in universe despite livecd-rootfs being in main. Both of those are undesired
and fixing them makes livecd-rootfs easier to
** Description changed:
+ [Impact]
+
+ * Livecd-rootfs switches from using pxz to xz
+ * Pxz is installed at run-time instead of being a package dependency and pxz
is in universe despite livecd-rootfs being in main. Both of those are undesired
and fixing them makes livecd-rootfs easier to
I opened LP: #1732681 to clarify if the regression is acceptable or xz
should use a different compression than -0.
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Title:
Please use xz instead
The original command's CPU usage is the following in xenial:
rbalint@xenial-test:~/Downloads$ time pxz -T4 -c
ubuntu-16.04.3-preinstalled-server-armhf+raspi2.img >
ubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.p.xz
real3m31.117s
user10m12.812s
sys 0m17.988s
Please disregard my previous result, the xz -0 does generate a bigger
.xz , it was a test running in parallel which updated the .xz file.
I'll attach the full test results when it is finished, but the actual file size
was bigger with xz -0:
323M
I tested the change with the image we actually ship with .xz compression
and to my greatest surprise xz -0 actually performed much better than
pxz with default compression:
$ du -sh *
1.2Gubuntu-16.04.3-preinstalled-server-armhf+raspi2.img
243M
This bug was fixed in the package livecd-rootfs - 2.448
---
livecd-rootfs (2.448) artful; urgency=medium
[ Balint Reczey ]
* Depend on packages in main instead of installing them at runtime
* Depend on vmdk-stream-converter instead of installing it at run time
* Use xz -T4 -0
** Branch linked: lp:~rbalint/livecd-rootfs/xz
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Title:
Please use xz instead of pxz
To manage notifications about this bug go to:
** Attachment added: "Nicely indented test results"
https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1701132/+attachment/4905008/+files/time-size.txt
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