Bug#1107592: unmkinitramfs: cpio failed on closed output pipe

[Benjamin Drung <bdrung@debian.org>]

Package: initramfs-tools
Version: 0.148.1
Severity: normal
X-Debbugs-Cc: bdrung@debian.org

Dear Maintainer,

The new unmkinitramfs written in C has a regression. In case the output
pipe of lsinitramfs is closed prematurely, you might get an error
message printed:

```
unmkinitramfs: cpio failed
```

I saw this failure in the qemu-busybox autopkgtest on Ubuntu, but were
able to reproduce it on Debian. Example:

```
$ lsinitramfs /boot/initrd.img-6.12.32-amd64 | grep -wq chroot
unmkinitramfs: cpio failed
```

-- 
Benjamin Drung
Debian & Ubuntu Developer