vbezhenar.com

Caps as Ctrl using udev

# evtest
...
/dev/input/event3:	AT Translated Set 2 keyboard
...
Select the device event number [0-15]: 3
Input driver version is 1.0.1
Input device ID: bus 0x11 vendor 0x1 product 0x1 version 0xab83
...
Press Caps Lock
...
Event: time 1724100071.543479, -------------- SYN_REPORT ------------
Event: time 1724100075.002355, type 4 (EV_MSC), code 4 (MSC_SCAN), value 3a
Event: time 1724100075.002355, type 1 (EV_KEY), code 58 (KEY_CAPSLOCK), value 1
Event: time 1724100075.002355, -------------- SYN_REPORT ------------
Event: time 1724100075.002712, type 17 (EV_LED), code 1 (LED_CAPSL), value 1
Event: time 1724100075.002712, -------------- SYN_REPORT ------------
Event: time 1724100075.260580, type 4 (EV_MSC), code 4 (MSC_SCAN), value 3a
Event: time 1724100075.260580, type 1 (EV_KEY), code 58 (KEY_CAPSLOCK), value 2
Event: time 1724100075.260580, -------------- SYN_REPORT ------------
Event: time 1724100075.280859, type 4 (EV_MSC), code 4 (MSC_SCAN), value 3a
Event: time 1724100075.280859, type 1 (EV_KEY), code 58 (KEY_CAPSLOCK), value 0
Event: time 1724100075.280859, -------------- SYN_REPORT ------------
...

bus=0011 vendor=0001 product=0001 version=AB83 scan=3A

/etc/udev/hwdb.d/caps-to-ctrl.hwdb:

evdev:input:b0011v0001p0001eAB83-*
 KEYBOARD_KEY_3A=leftctrl

systemd-hwdb update
udevadm trigger

curl -g -i -X POST 'https://prometheus.cmctech.pro/api/v1/admin/tsdb/delete_series?match[]=container_memory_working_set_bytes:max_by_pod_base_name{namespace="loki",pod_base_name="loki"}&end=2024-05-09T20:00:00Z'

Using aws cli for S3 inside docker

read AWS_ACCESS_KEY_ID
read AWS_SECRET_ACCESS_KEY
export AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY
docker run --rm \
  -e 'AWS_ACCESS_KEY_ID' -e 'AWS_SECRET_ACCESS_KEY' \
  -v "$PWD:/aws" \
  'docker.io/amazon/aws-cli:latest' \
  --endpoint-url='https://archive.pscloud.io' \
  --region='kz-ala-1' \
  s3 cp './local-file' 's3://bucket/key/name'

docker cmd for sleep responding to signals

docker run --rm -it alpine:3 sh -c 'trap true TERM; sleep 1 & while wait $!; do sleep 1 & done'

gdb cheatsheet

target remote 127.0.0.1:4242
p/z $r0 # print, z: hex; t: two
x/z 0x40021008 # eXamine
display/z $r0
display/4i $pc - 1
display/z *((int*)$sp)@4
stepi # step instruction
info registers

Install homebrew package without homebrew

Example URLs:

https://formulae.brew.sh/formula/stlink
 https://formulae.brew.sh/api/formula/stlink.json
  .bottle.stable.arm64_ventura.url:
  https://ghcr.io/v2/homebrew/core/stlink/blobs/sha256:37bc6182a2709fbcd5046be4c1cb93936475f12d2ee42983e9f7802ed89bc97c
 https://formulae.brew.sh/api/formula/libusb.json
  .bottle.stable.arm64_ventura.url:
  https://ghcr.io/v2/homebrew/core/libusb/blobs/sha256:ea8a4a04b5cc81eff38d0c5cdfe2fbac519ca2c7652c64371074f4abaf766a0b

Keychain Access, Certificate Assistant, Create a Certificate, Code Signing

curl -L -H 'Authorization: Bearer QQ==' -o 'stlink-bottle.tar.gz' 'https://ghcr.io/v2/homebrew/core/stlink/blobs/sha256:37bc6182a2709fbcd5046be4c1cb93936475f12d2ee42983e9f7802ed89bc97c'
curl -L -H 'Authorization: Bearer QQ==' -o 'libusb-bottle.tar.gz' 'https://ghcr.io/v2/homebrew/core/libusb/blobs/sha256:ea8a4a04b5cc81eff38d0c5cdfe2fbac519ca2c7652c64371074f4abaf766a0b'
tar -x -f stlink-bottle.tar.gz
tar -x -f libusb-bottle.tar.gz
mkdir stlink-1.7.0
mv stlink/1.7.0/bin/* stlink-1.7.0/
mv libusb/1.0.26/lib/libusb-1.0.0.dylib stlink-1.7.0/
otool -L stlink-1.7.0/st-flash
install_name_tool -change '@@HOMEBREW_PREFIX@@/opt/libusb/lib/libusb-1.0.0.dylib' '/opt/stlink-1.7.0/libusb-1.0.0.dylib' stlink-1.7.0/st-flash
install_name_tool -change '@@HOMEBREW_PREFIX@@/opt/libusb/lib/libusb-1.0.0.dylib' '/opt/stlink-1.7.0/libusb-1.0.0.dylib' stlink-1.7.0/st-info
install_name_tool -change '@@HOMEBREW_PREFIX@@/opt/libusb/lib/libusb-1.0.0.dylib' '/opt/stlink-1.7.0/libusb-1.0.0.dylib' stlink-1.7.0/st-trace
install_name_tool -change '@@HOMEBREW_PREFIX@@/opt/libusb/lib/libusb-1.0.0.dylib' '/opt/stlink-1.7.0/libusb-1.0.0.dylib' stlink-1.7.0/st-util
codesign -s 'Vladimir Bezhenar' -f stlink-1.7.0/st-flash
codesign -s 'Vladimir Bezhenar' -f stlink-1.7.0/st-info
codesign -s 'Vladimir Bezhenar' -f stlink-1.7.0/st-trace
codesign -s 'Vladimir Bezhenar' -f stlink-1.7.0/st-util
sudo cp -r stlink-1.7.0 /opt/stlink-1.7.0

keytool cheatsheet

keytool -import -alias alias -keystore keystore.jks -file certificate.der

kubectl exec etcdctl

Invoking etcdctl using kubectl for kubeadm cluster

kubectl exec -n kube-system etcd-control-0 -- sh -c 'ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key member list'

maven minimal pom.xml

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0">
  <modelVersion>4.0.0</modelVersion>

  <groupId>java-21-test</groupId>
  <artifactId>java-21-test</artifactId>
  <version>0.0.0-SNAPSHOT</version>

  <properties>
    <maven.compiler.release>21</maven.compiler.release>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven-clean-plugin.version>3.3.2</maven-clean-plugin.version>
    <maven-compiler-plugin.version>3.13.0</maven-compiler-plugin.version>
    <maven-enforcer-plugin.version>3.4.1</maven-enforcer-plugin.version>
    <maven-jar-plugin.version>3.3.0</maven-jar-plugin.version>
    <maven-resources-plugin.version>3.3.1</maven-resources-plugin.version>
    <maven-surefire-plugin.version>3.2.5</maven-surefire-plugin.version>
    <maven-toolchains-plugin.version>3.1.0</maven-toolchains-plugin.version>
    <versions-maven-plugin.version>2.16.2</versions-maven-plugin.version>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <executions>
          <execution>
            <id>enforce-maven</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requireMavenVersion>
                  <version>3.9.5</version>
                </requireMavenVersion>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-toolchains-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>toolchain</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <toolchains>
            <jdk>
              <version>21</version>
            </jdk>
          </toolchains>
        </configuration>
      </plugin>
    </plugins>

    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-clean-plugin</artifactId>
          <version>${maven-clean-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>${maven-compiler-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-enforcer-plugin</artifactId>
          <version>${maven-enforcer-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jar-plugin</artifactId>
          <version>${maven-jar-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-resources-plugin</artifactId>
          <version>${maven-resources-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>${maven-surefire-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-toolchains-plugin</artifactId>
          <version>${maven-toolchains-plugin.version}</version>
        </plugin>

        <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>versions-maven-plugin</artifactId>
          <version>${versions-maven-plugin.version}</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

~/.m2/toolchains.xml:

<?xml version="1.0" encoding="UTF-8"?>
<toolchains>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.8</version>
      <vendor>openjdk</vendor>
    </provides>
    <configuration>
      <jdkHome>/opt/jdk-1.8/</jdkHome>
    </configuration>
  </toolchain>

  <toolchain>
    <type>jdk</type>
    <provides>
      <version>11</version>
      <vendor>openjdk</vendor>
    </provides>
    <configuration>
      <jdkHome>/opt/jdk-11/</jdkHome>
    </configuration>
  </toolchain>

  <toolchain>
    <type>jdk</type>
    <provides>
      <version>17</version>
      <vendor>openjdk</vendor>
    </provides>
    <configuration>
      <jdkHome>/opt/jdk-17/</jdkHome>
    </configuration>
  </toolchain>

  <toolchain>
    <type>jdk</type>
    <provides>
      <version>21</version>
      <vendor>openjdk</vendor>
    </provides>
    <configuration>
      <jdkHome>/opt/jdk-21/</jdkHome>
    </configuration>
  </toolchain>
</toolchains>

mvn versions:display-property-updates

openssl print utf8

openssl x509 -in cert.pem -nameopt utf8,sep_multiline -text

Oracle Linux Cloud default user

cloud-user
Idea SLF4J logger live template
``` private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger($CLASS$.class); ``` Applicable in Java: declaration CLASS: className(), Skip if defined
psql essentials

Invocation: psql -h host -p port -U user dbname

List tables: \dt [*tbl*]

Show DDL: \d tbl

Customize fat label with qemu virtual fat driver

  -blockdev driver=vvfat,node-name=cidata,read-only=on,dir="$cidata_dir",label='CIDATA' \
  -device virtio-blk-pci,drive=cidata \

Retrieve graphql schema

npm install gql-sdl
npx gql-sdl -H 'Cookie:auth=token' https://example.com/graphql > example.graphql