Lab4 by Valentin Chernyshov

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submitions/lab4/submition4.md

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+# Lab4
+
+## Note from personal hands-on experience
+
+    - Pacman is mach faster than the apt since it is just faster by itself and allows for parrallel download since recently (before powerpill was used, and I'm not sure about parralel download in apt)
+    - Pacman is more convenient (maybe just a preference), especially since AUR package managers, such as yay and paru, provide very convenient package locations (they have search)
+    - So the arch/manjaro would be the distribution to install :-) if it were stable
+    - As a result, I end up using NixOS since it is something new and exotic :)
+    - Due to I refusal to use ubuntu/debian this lab was done in a Docker container
+
+## Task 1
+
+1. Run the container with ubuntu
+    ```bash
+    docker run -it --name=devopsLab-v./submitions/lab4/ubuntuVol:/labmaterials--entrypoint/bin/bashubuntu
+    ```
+2. if required, you could access the container with `docker start -ai devopsLab`
+3. Install dpkg-dev
+    ```bash
+    apt update
+    apt-get install dpkg-dev
+    ```
+4. Generate a package index:
+    ```bash
+    dpkg-scanpackages ./ /dev/null | gzip-9c > ./Packages.gz
+    ```
+5. Update package name with vim:
+    ```
+    # zcat Packages.gz
+    Package: my-vs-code
+    Version: 1.91.1-1720564633
+    Architecture: amd64
+    Maintainer: Microsoft Corporation <vscode-linux@microsoft.com>
+    Installed-Size: 388720
+    Depends: ca-certificates, libasound2 (>= 1.0.17), libatk-bridge2.0-0 (>= 2.5.3), libatk1.0-0 (>= 2.2.0), libatspi2.0-0 (>= 2.9.90), libc6 (>= 2.14), libc6 (>= 2.16), libc6 (>= 2.17), libc6 (>= 2.2.5), libc6 (>= 2.28), libcairo2 (>= 1.6.0), libcurl3-gnutls | libcurl3-nss | libcurl4 | libcurl3, libdbus-1-3 (>= 1.9.14), libdrm2 (>= 2.4.75), libexpat1 (>= 2.1~beta3), libgbm1 (>= 17.1.0~rc2), libglib2.0-0 (>= 2.37.3), libgssapi-krb5-2 (>= 1.17), libgtk-3-0 (>= 3.9.10), libgtk-3-0 (>= 3.9.10) | libgtk-4-1, libkrb5-3 (>= 1.6.dfsg.2), libnspr4 (>= 2:4.9-2~), libnss3 (>= 2:3.30), libnss3 (>= 3.26), libpango-1.0-0 (>= 1.14.0), libx11-6, libx11-6 (>= 2:1.4.99.1), libxcb1 (>= 1.9.2), libxcomposite1 (>= 1:0.4.4-1), libxdamage1 (>= 1:1.1), libxext6, libxfixes3, libxkbcommon0 (>= 0.5.0), libxkbfile1 (>= 1:1.1.0), libxrandr2, xdg-utils (>= 1.0.2)
+    Recommends: libvulkan1
+    Conflicts: visual-studio-code
+    Replaces: visual-studio-code
+    Provides: visual-studio-code
+    Filename: ./code_1.91.1-1720564633_amd64.deb
+    Size: 100924046
+    MD5sum: 04821bd56f47d5fbe8bf8f621e791437
+    SHA1: 48d095107eeb17f256952d7a7c0bfb2045d3221d
+    SHA256: 31a13c05295f3349d3dc168d9c67dda4fcf30823fe3c34f215f0324d197f5479
+    Section: devel
+    Priority: optional
+    Homepage: https://code.visualstudio.com/
+    Description: Code editing. Redefined.
+    Visual Studio Code is a new choice of tool that combines the simplicity of
+    a code editor with what developers need for the core edit-build-debug cycle.
+    See https://code.visualstudio.com/docs/setup/linux for installation
+    instructions and FAQ.
+    ```
+6. Add repo to the source list
+    ```bash
+    echo "deb [trusted=yes] file:/labmaterials ./" | tee/etc/apt/sources.list.d/local-apt-repo.list
+    sudo apt update
+    ```
+
+    ![alt text](1.png)
+
+7. verify package exist
+
+    ![alt text](2.png)
+
+8. Install package with `apt install my-vs-code`
+
+    ![alt text](3.png)
+
+## Task 2
+
+1. Use `apt-cache showpkg my-vs-code`
+    - It provides all the dependancies for vscode, as well as reverse dependancies (no in case of vscode) and providers.
+
+    ![alt text](4.png)
+
+2. simulate installation with the `-s` flag
+    - It provides information about the current state of the package in a system and what packages would be affected by the installation process (in the case of a custom pkg re-installation would yelld removal of code pkg and the installation of the "my-vs-code" pkg)
+
+    ![alt text](5.png)
+
+    - it is actually the same as if you try to install a package and say "no" when apt ask you to proceed with installation.
+
+    ![alt text](6.png)
+
+## Task 3
+
+1. hold the code pkg with `apt-mark hold code`
+2. try to reinstall "code" with "my-vs-code"
+    - the result is an error due to held pkg
+    ```
+    Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
+    ```
+3. unhold "code" pkg
+    - the installation of "my-vs-code" did not yelld an exeption anymore
+
+    ![alt text](7.png)