christian-korneck

Powershell pure text grep (grepp)

what

A grep command (grepp) in Powershell that lets you grep for a string in the text that would usually be printed in the terminal (not some other representation of the data). Output is a string, not a pipeline anymore - thus destructive.

why

To quickly grep through shell output without having to do where-object gymnastics.

christian-korneck

• virtio downloads (fedora / red hat signed): https://github.com/virtio-win/virtio-win-pkg-scripts/blob/master/README.md
  • virtio guest tools: https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win-guest-tools.exe
  • virtio drivers iso: https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win.iso
• spice downloads: https://www.spice-space.org/download.html
  • guest tools (required for dynamic gpu resultion): https://www.spice-space.org/download/windows/spice-guest-tools/spice-guest-tools-latest.exe
  • spice virtviewer for windows: http://virt-manager.org/download
• on download server: https://releases.pagure.org/virt-viewer

christian-korneck

A way to reboot into recovery mode (Windows boots into GUI with only minimal drivers loaded):

• bcdedit /set "{current}" safeboot minimal
• reboot. Machine will boot into recovery mode.
• in recovery mode, disable it before rebooting: bcdedit /deletevalue "{current}" safeboot

christian-korneck

I have a Windows 11 23H2 VM with a SATA boot disk running on virtmanager (KVM/Qemu) on Fedora 39 that I want to convert to a virtio disk.

• in windows install virtio guest tools (download)
• create cd drive and attach virtio iso (download)
• shutdown vm
• in virtmanager preferences, enable xml editing
• in the vm disk settings, go to the xml tab, backup the existing xml and change it:

old:

christian-korneck

# make a query at this point in time
$ promtool query instant http://localhost:9090 '{job=~".+"}'
    up{instance="localhost:9090", job="prometheus"} => 1 @[1690724237.225]
    go_memstats_alloc_bytes{instance="localhost:9090", job="prometheus"} => 29046776 @[1690724237.225]
    ...

# query a metric for the time range between two Unix timestamp
$ promtool query range --start 1690724700 --end 1690725307 --step 1m http://localhost:9090 \
 'go_memstats_alloc_bytes{job="prometheus"}'
    23215032 @[1690724700]

christian-korneck

Podman error setting value of extended attribute "security.ima" on "/catatonit": operation not permitted:

example error message (when trying to run a k8s yaml as unpriv'ed user)

[user@host]$ podman kube play boom.yml
Error: building local pause image: building at STEP "COPY /usr/libexec/podman/catatonit /catatonit": storing "/usr/libexec/podman/catatonit": error during bulk transfer for copier.request{Request:"PUT", Root:"/", preservedRoot:"/home/opc/.local/share/containers/storage/overlay/ba320139a68ad5418cef299dd724dc9fc53737c8a3cba1ad9d30c3a25dfcca45/merged", rootPrefix:"/home/opc/.local/share/containers/storage/overlay/ba320139a68ad5418cef299dd724dc9fc53737c8a3cba1ad9d30c3a25dfcca45/merged", Directory:"/", preservedDirectory:"/home/opc/.local/share/containers/storage/overlay/ba320139a68ad5418cef299dd724dc9fc53737c8a3cba1ad9d30c3a25dfcca45/merged", Globs:[]string{}, preservedGlobs:[]string{}, StatOptions:copier.StatOptions{CheckForArchives:false, Excludes:[]string(nil)}, GetOptions:copier.GetOpt

christian-korneck

# as demo data, let's use a copy of the alpine rootfs (which contains both binary and text files)
$ wget https://dl-cdn.alpinelinux.org/alpine/v3.18/releases/aarch64/alpine-minirootfs-3.18.0-aarch64.tar.gz
$ tar xf alpine-minirootfs-3.18.0-aarch64.tar.gz
$ ls
/bin
/etc
...

# make this dir a git repo and enable git-lfs

christian-korneck

# we're on Ubuntu 20.04 on arm64
$ uname -a
...
Linux [...] 5.15.0 #40~20.04.1-Ubuntu [...] aarch64 [...]
...

# install build tools
$ apt-get -y update && apt-get -y install curl build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev pkg-config
# install latest Go

christian-korneck

• Why?
  • describe issue (motivation of the change)
    • describe error scenario ("as-is it throws unhandled exception on special characters").
    • introduce issue report (i.e. cite linter warnings)
    • describe shortcomings ("I'm unhappy with [...]: No timeouts, features like x are clumsy.")
  • illustrate requirement
    • usage need ("x is only works on pre-Python 3.7, but we want to support all Python 3 versions")
    • out of date ("remove outdated property. x is no longer defined, but was still referenced in the docs")
    • runtime or dev env change ("API has changed, fixing the example")
• describe objective

christian-korneck

@echo off
setlocal

REM batch script that executes the command that it received via STDIN
REM (whitespaces should be working)

for /f "tokens=*" %%i in ('find /v ""') do set MYCMD=%%i
cmd.exe /c %MYCMD%
set myerrorlevel=%errorlevel%