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[Solved] how to remaster cat'ed initramfs?

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GNUser:
If I create an initramfs from two more components, like so...


--- Code: ---$ cat modules64.gz rootfs64.gz > corepure64.gz

--- End code ---
...then try to remaster the resulting initramfs like so...

--- Code: ---$ sudo su -c "mkdir temp; cd temp; gunzip -c ../corepure64.gz | cpio -i"
30012 blocks
--- End code ---

...I notice that only the contents of the first argument to  cat  (modules64.gz in this case) appear inside the  temp  directory.

Is there a way to remaster the entire  corepure64.gz  in this example (short of remastering its component parts then recreating  corepure64.gz  using cat)?

Paul_123:
Does zcat work

zcat "${OLDINITRD}" | sudo cpio -i -H newc -d

GNUser:

--- Quote from: Paul_123 on January 09, 2026, 04:05:44 PM ---Does zcat work

zcat "${OLDINITRD}" | sudo cpio -i -H newc -d

--- End quote ---
Hi Paul_123. zcat doesn't help:

--- Code: ---$ cat modules64.gz rootfs64.gz > corepure64.gz
$ sudo su -c "mkdir temp; cd temp; zcat ../corepure64.gz | cpio -i -H newc -d"
30012 blocks
$ ls temp
lib/ usr/
--- End code ---
Note how only the contents of  modules64.gz  appear inside the temp directory.

Rich:
Hi GNUser
Try this:

--- Code: ---mkdir tempdir
cd tempdir
zcat /path/to/existing/rootfs.gz | sudo cpio -i
--- End code ---

GNUser:

--- Quote from: Rich on January 09, 2026, 05:12:30 PM ---Hi GNUser
Try this:

--- Code: ---mkdir tempdir
cd tempdir
zcat /path/to/existing/rootfs.gz | sudo cpio -i
--- End code ---

--- End quote ---
Hi Rich. No luck with that, either:


--- Code: ---$ cat modules64.gz rootfs64.gz > corepure64.gz
$ mkdir tempdir
$ cd tempdir
$ zcat ../corepure64.gz | sudo cpio -i
30012 blocks
$ ls
lib/ usr/
--- End code ---
Maybe there's a better way to create  corepure64.gz  from smaller initramfs'es than simply using cat.

EDIT: When a new version of TCL is released and  corepure64.gz  is posted, how does it get created? I have no problem remastering  corepure64.gz  from stable TCL releases. It's only  corepure64.gz  that I create using  cat  that misbehaves in this way.

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