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+ index = 0;
+ }
+ // Account for out-of-bounds indices:
+ if (index < 0 || index >= size) {
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+ }
+ // Get the first code unit
+ var first = string.charCodeAt(index);
+ var second;
+ if ( // check if it’s the start of a surrogate pair
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+ size > index + 1 // there is a next code unit
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+ second = string.charCodeAt(index + 1);
+ if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
+ // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+ return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+ }
+ }
+ return first;
+ };
+ if (Object.defineProperty) {
+ Object.defineProperty(String.prototype, 'codePointAt', {
+ 'value': codePointAt,
+ 'configurable': true,
+ 'writable': true
+ });
+ } else {
+ String.prototype.codePointAt = codePointAt;
+ }
+ }());
+}
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+d.B?d.B():d.call(null);a[6]=b;return a}();return yx(e)}}(d,c));return d}
+function OA(a,b,c){c=Ty(c,!0);var d=Sy(b,JA),e=Sy(b,KA),f=yp(function(){return function(){return Hm.h(B(a))}}(c,d,e)),h=yp(function(){return function(){return el.h(B(a))}}(c,d,e,f)),k=yp(function(a,b,c,d,e){return function(){var a=B(d);return t(a)?a:B(e)}}(c,d,e,f,h)),l=yp(function(b,c,d,e,f,h){return function(){var b=Gk.h(B(a));b=t(b)?b:wb(B(h));return t(b)?"hud":null}}(c,d,e,f,h,k)),p=yp(function(){return function(){return["asciinema-theme-",v.h(gm.h(B(a)))].join("")}}(c,d,e,f,h,k,l)),m=yp(function(){return function(){var b=
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+d,e,f,h,k,l,p,m,u,w,x,C,F)),M=yp(function(){return function(){return wl.h(B(a))}}(c,d,e,f,h,k,l,p,m,u,w,x,C,F,I)),S=B(a),X=null!=S&&(S.m&64||q===S.G)?P(U,S):S,Ga=D.c(X,ki),db=D.c(X,li),Q=D.c(X,mi),xb=D.c(X,ni);return function(a,c,d,e,f,h,k,l,m,p,u,w,x,C,F,I,M,S,Q,X,Ga,db){return function(){return new R(null,3,5,T,[Cn,new r(null,5,[Jj,-1,Zj,c,Rn,d,Vm,a,vn,B(k)],null),new R(null,7,5,T,[Sm,new r(null,1,[vn,B(l)],null),new R(null,6,5,T,[rA,m,p,u,w,x],null),new R(null,5,5,T,[DA,C,F,I,b],null),t(t(Q)?Q:
+X)?new R(null,5,5,T,[LA,Q,X,Ga,db],null):null,t(B(h))?null:new R(null,2,5,T,[EA,b],null),t(B(e))?new R(null,1,5,T,[FA],null):null],null)],null)}}(c,d,e,f,h,k,l,p,m,u,w,x,C,F,I,M,S,X,Ga,db,Q,xb)}
+function PA(a){var b=Kx(null),c=Kx(new dx(bx(1),1));return function(b,c){return function(){return Pp(new r(null,4,[ln,"asciinema-player",Dm,function(b,c){return function(){return OA(a,b,c)}}(b,c),$k,function(b,c){return function(){var d=ty(Gl.h(B(a))),e=MA(c);Tx(e,b);return NA(a,Je([b,d]))}}(b,c),Wm,function(){return function(){return uy(Gl.h(B(a)))}}(b,c)],null))}}(b,c)};function QA(a,b){var c=null!=b&&(b.m&64||q===b.G)?P(U,b):b,d=D.c(c,Ak),e=D.c(c,Gl);d=a.h?a.h(d):a.call(null,d);zy(e,d);return K.l(c,Ak,d)}$x.prototype.sb=q;$x.prototype.qb=function(a,b){var c=null!=b&&(b.m&64||q===b.G)?P(U,b):b,d=D.c(c,Uj),e=D.c(c,wl),f=D.c(c,Gl);t(e)&&yy(f,Nu(d+5,e));return c};ay.prototype.sb=q;ay.prototype.qb=function(a,b){var c=null!=b&&(b.m&64||q===b.G)?P(U,b):b,d=D.c(c,Uj),e=D.c(c,wl),f=D.c(c,Gl);t(e)&&yy(f,Nu(d+-5,e));return c};by.prototype.sb=q;
+by.prototype.qb=function(a,b){var c=null!=b&&(b.m&64||q===b.G)?P(U,b):b,d=D.c(c,wl),e=D.c(c,Gl);t(d)&&(d*=nn.h(this),yy(e,d));return c};dy.prototype.sb=q;dy.prototype.qb=function(a,b){return QA(function(){return function(a){return a/2}}(this),b)};ey.prototype.sb=q;ey.prototype.qb=function(a,b){return QA(function(){return function(a){return 2*a}}(this),b)};fy.prototype.sb=q;fy.prototype.qb=function(a,b){xy(Gl.h(b));return b};gy.prototype.sb=q;gy.prototype.qb=function(a,b){return K.l(b,ml,so.h(this))};
+hy.prototype.sb=q;hy.prototype.qb=function(a,b){return K.l(b,Gk,so.h(this))};jy.prototype.sb=q;jy.prototype.qb=function(a,b){var c=null!=a&&(a.m&64||q===a.G)?P(U,a):a;D.c(c,fl);D.c(c,no);D.c(c,wl);c=null!=b&&(b.m&64||q===b.G)?P(U,b):b;var d=D.c(c,fl),e=D.c(c,no),f=null!=this&&(this.m&64||q===this.G)?P(U,this):this,h=D.c(f,fl),k=D.c(f,no);f=D.c(f,wl);return K.A(c,fl,t(d)?d:h,be([no,t(e)?e:k,wl,f]))};ky.prototype.sb=q;ky.prototype.qb=function(a,b){return K.l(b,Hm,Hm.h(this))};oy.prototype.sb=q;
+oy.prototype.qb=function(a,b){var c=null!=b&&(b.m&64||q===b.G)?P(U,b):b,d=D.c(c,oi);t(d)&&(ap(bp),d.B?d.B():d.call(null));return c};ry.prototype.sb=q;ry.prototype.qb=function(a,b){return K.l(b,Uj,Zk.h(this))};function RA(){return ig.l(function(a,b){return new R(null,2,5,T,[a,new gy(b,null,null,null)],null)},rg(function(a){return a+.5},.5),og(new R(null,2,5,T,[!1,!0],null)))}function SA(a){var b=Dy(RA());return K.l(K.l(a,ml,!0),Ol,b)}
+function TA(a){a=null!=a&&(a.m&64||q===a.G)?P(U,a):a;var b=D.c(a,Ol);Tw(b);return K.l(K.l(a,ml,!0),Ol,null)}function UA(a){a=null!=a&&(a.m&64||q===a.G)?P(U,a):a;a=D.c(a,Ol);return t(a)?Je([a]):vi}my.prototype.sb=q;
+my.prototype.qb=function(a,b){var c=null!=a&&(a.m&64||q===a.G)?P(U,a):a;D.c(c,jn);var d=null!=b&&(b.m&64||q===b.G)?P(U,b):b,e=D.c(d,jn);c=D.c(d,pi);var f=D.c(d,qi),h=null!=this&&(this.m&64||q===this.G)?P(U,this):this;h=D.c(h,jn);if(G.c(e,h))return d;d=K.A(d,jn,h,be([el,!0]));if(t(h))return t(c)&&(c.B?c.B():c.call(null)),SA(d);t(f)&&(f.B?f.B():f.call(null));return TA(d)};my.prototype.Fe=q;my.prototype.de=function(a,b){return UA(b)};py.prototype.sb=q;
+py.prototype.qb=function(a,b){var c=K.l(b,V,V.h(this));c=null!=c&&(c.m&64||q===c.G)?P(U,c):c;var d=D.c(c,Ol);return t(d)?SA(TA(c)):c};py.prototype.Fe=q;py.prototype.de=function(a,b){return UA(b)};function VA(a){return t(a)?(a=ig.c(parseFloat,Fo(""+v.h(a),/:/)),a=ig.l(Ye,cf(a),rg(function(){return function(a){return 60*a}}(a),1)),P(Xe,a)):null}
+function WA(a,b,c){t(a)?"string"===typeof a?t(0===a.indexOf("data:application/json;base64,"))?(b=a.substring(29).replace(RegExp("\\s","g"),""),b=JSON.parse(atob(b)),b=fj(b),b=new r(null,1,[V,new r(null,1,[il,b],null)],null)):t(0===a.indexOf("data:text/plain,"))?(a=a.substring(16),b=Ju(Ot(t(b)?b:80,t(c)?c:24),a),b=new r(null,1,[V,b],null)):b=t(0===a.indexOf("npt:"))?new r(null,1,[Zk,VA(a.substring(4))],null):null:b=new r(null,1,[V,new r(null,1,[il,a],null)],null):b=null;return b}
+var XA=new r(null,2,[pl,new r(null,1,[On,!1],null),il,he],null);
+function YA(a,b){var c=null!=b&&(b.m&64||q===b.G)?P(U,b):b,d=D.c(c,no),e=D.l(c,wk,"small"),f=D.l(c,Ak,1),h=D.c(c,Hk),k=D.c(c,fl),l=D.c(c,rl),p=D.l(c,cm,!1),m=D.l(c,gm,"asciinema"),u=D.c(c,qm),w=D.c(c,Bm),x=D.l(c,vm,!1),C=D.l(c,Em,!1),F=function(){var a=VA(h);return t(a)?a:0}();w=WA(w,k,d);var I=null!=w&&(w.m&64||q===w.G)?P(U,w):w;w=D.c(I,V);I=D.c(I,Zk);var M=t(I)?I:wb(w)&&0
+```
+
+Note that good commit message should provide information in similar way like
+the PR description. Poorly written commit messages can block the merge of PR
+or proper review.
+
+### Granularity of commits
+The granularity of commits depends strongly on the problem being solved. However,
+a large number of small commits is typically undesired. If possible, aim a
+Git history such that commits can be reverted individually, without requiring reverting
+numerous other dependent commits in order to get the `main` branch into a working state.
+
+Note that commits fixing problems of other commits in the PR are expected to be
+squashed before the final review and merge of the PR. Using of `git commit --fixup ...`
+and `git commit --squash ...` commands can help you to prepare such commits
+properly in advance and make the rebase later easier using `git rebase -i --autosquash`.
+We suggest you to get familiar with these commands as it can make your work really
+easier. Note that when you are starting to get higher number of such fixing commits
+in your PR, it's good practice to use the rebase more often. High numbers of such
+commits could make the final rebase more tricky in the end. So your PR should not
+have more than 15 commits at any time.
+
+### Create a separate git branch for your changes
+TBD
+
diff --git a/docs/source/faq.md b/docs/source/faq.md
new file mode 100644
index 0000000000..25903bea3b
--- /dev/null
+++ b/docs/source/faq.md
@@ -0,0 +1,101 @@
+# Frequently Asked Questions
+
+- [Why is the leapp-repository project separated from Leapp?](#why-is-the-leapp-repository-project-separated-from-leapp)
+- [What is an actor and what does it do?](#what-is-an-actor-and-what-does-it-do)
+- [When and why do I need to write an actor?](#when-and-why-do-i-need-to-write-an-actor)
+- [What are the best practices for writing actors for in-place upgrades?](#what-are-the-best-practices-for-writing-actors-for-in-place-upgrades)
+- [What are the best practices for creating and adding custom actors for in-place upgrades?](#what-are-the-best-practices-for-creating-and-adding-custom-actors-for-in-place-upgrades)
+- [What are the requirements for actors to be accepted by upstream?](#what-are-the-requirements-for-actors-to-be-accepted-by-upstream)
+- [How can I debug my actor? Is there a standard/supported way how to log and get logs from actors/channels?](#)
+- [Are there some technical limitations for an actor? Like maximum time execution](#are-there-some-technical-limitations-for-an-actor-like-maximum-time-execution)
+- [Are there some actions that are either forbidden or not recommended to be done in actors?](#are-there-some-actions-that-are-either-forbidden-or-not-recommended-to-be-done-in-actors)
+- [I got an error about PES data/ Repositories mapping.](#i-got-an-error-about-pes-data-repositories-mapping)
+
+## Why is the leapp-repository project separated from Leapp?
+
+It's similar relationship as you can find between Ansible and ansible playbooks.
+Having Ansible does not mean that it configure all systems as people want.
+People have to create playbooks to define how systems should be configured.
+
+With leapp and leapp-repository it's same. The leapp project covers only the
+Leapp framework, the leapp tool (providing CLI), and snactor - the utility helping
+with the development and testing. The framework has been supposed to be used
+for multiple purposes. In-Place Upgrades have been just one of them.
+
+Even when we work on both projects, having the work on framework separated
+from leapp repositories containing number of actors simplifies the maintenance
+of the project.
+
+## What is an actor and what does it do?
+
+An actor in the realm of the Leapp project is a step that is executed within a workflow. Actors define what kind of data they expect and what kind of data they produce.
+
+One of the use cases for actors is to scan the system and provide the discoveries to other actors through messages. Other actors consume these messages to make decisions, apply changes to the system, or process the information to produce new messages.
+
+## When and why do I need to write an actor?
+
+This project is focused on in-place upgrades between major versions of RHEL systems.
+Here we can implement and test solutions with the focus on content of the particular
+distribution (RPM signed by GPG keys connected to the distribution). However,
+most of the time you do not install just RPMs from that particular system, but
+also your custom or third-party SW - or HW also. When you need to handle
+your custom/third-party stuff, you will need to possibly create custom actors
+to do so - or you could ask a third-party vendor for a solution.
+
+Also, in case you have a specific system setup that we cannot cover, you would
+possibly customize the upgrade on your systems.
+
+## What are the best practices for writing actors for in-place upgrades?
+
+Read the [Best practices for writing actors](best-practices).
+
+## What are the best practices for creating and adding custom actors for in-place upgrades?
+
+TBA
+
+## What are the requirements for actors to be accepted by upstream?
+
+It should follow the [Contribution guidelines](contributing) and the [Best practices for writing actors](best-practices) as much as feasible.
+If you are not sure whether the solution you are thinking about will be accepted
+at all, try to ask first via [Discussion](https://github.com/oamg/leapp-repository/discussions)
+and discuss it with us.
+
+## How can I debug my actor? Is there a standard/supported way how to log and get logs from actors/channels?
+
+You can run your actor using the snactor tool and printing the output. [See the tutorial](tutorials/first-actor) on how to use snactor.
+
+## Are there some technical limitations for an actor? Like maximum time execution, ...
+
+There are no technical limitations but rather conceptual:
+
+- Libraries to use:
+ - See the section about actor dependencies in the [Best practices document](best-practices.md#do-not-introduce-new-dependencies)
+
+Execution time:
+
+- Some Red Hat customers do business in fields where time matters a lot. They may have obligations to not allow more than a few minutes of downtime per year. It means that we should make sure that our tooling causes as short downtime as possible.
+- It's not currently possible to tell the Leapp framework that the actor takes longer time to execute.
+
+## Are there some actions that are either forbidden or not recommended to be done in actors?
+
+There are several, covered also in contribution guideline, but highlight these few:
+1. **Do not alter the system in any way during so called preupgrade phases.**
+Even then we want to postpone as many changes as possible after the `LateTestsPhase`
+phase. Any deviation from this rule must be well justified.
+
+1. **Do not use `subprocess` python module**. If you need to execute a shell command,
+use the `run` function instead.
+
+1. **Do not interact with the system during the `ChecksPhase`.** You can scan
+the system in previous phase and generate a leapp message for the check actor.
+
+## I got an error about PES data/ Repositories mapping.
+
+Most likely you replaced leapp data files included in the installed RPM by
+different files (usually by their obsolete versions). Remove them, reinstall
+the package, and try to not replace them again. If it is not that case, contact
+vendor of the package for support.
+
+Note that in public space there are number of various versions of these files
+and we are responsible only for files that we distribute together with our code.
+
diff --git a/docs/source/index.rst b/docs/source/index.rst
new file mode 100644
index 0000000000..6faa0be29a
--- /dev/null
+++ b/docs/source/index.rst
@@ -0,0 +1,27 @@
+Welcome to developer documentation for Leapp repository!
+========================================================
+
+`Leapp repository `_ is a collection
+of repositories for the `Leapp framework `_
+providing Red Hat Enterprise Linux in-place upgrade functionality.
+
+.. toctree::
+ :maxdepth: 4
+ :caption: Contents:
+ :glob:
+
+ installation-and-building
+ tutorials/index
+ project-structure
+ upgrade-architecture-and-workflow/index
+ configuring-ipu
+ libraries-and-api
+ contrib-and-devel-guidelines
+ faq
+
+.. Indices and tables
+.. ==================
+..
+.. * :ref:`genindex`
+.. * :ref:`modindex`
+.. * :ref:`search`
diff --git a/docs/source/installation-and-building.md b/docs/source/installation-and-building.md
new file mode 100644
index 0000000000..94554185c8
--- /dev/null
+++ b/docs/source/installation-and-building.md
@@ -0,0 +1,108 @@
+# Installation and building
+
+We expect this software to be installed on systems always as RPM packages.
+To make the development & testing easier we provide the Makefile with useful
+commands for local building and also upstream DNF COPR repository for public
+upstream and testing builds.
+
+## Local builds
+To build the package locally from the current code we prepared building in
+containers, so we could build the RPM with packages of the particular system.
+To build the RPM e.g. for RHEL 8 systems, execute:
+```bash
+$ BUILD_CONTAINER=el8 make container_build
+```
+
+You will find created builds under the `packaging/RPMS/` directory.
+
+If a particular container image does not exist, it will be automatically created
+based on prepared [container files](https://github.com/oamg/leapp-repository/tree/main/utils/container-builds).
+
+Note that from time to time it's possible you may want to (or need to)
+rebuild the container image. To clean created container images, call
+```
+$ make clean_containers
+```
+
+### Use Docker instead of Podman
+If you want to use Docker instead of Podman, just specify `CONTAINER_TOOL=docker`.
+E.g.:
+```bash
+$ CONTAINER_TOOL=docker BUILD_CONTAINER=el8 make container_build
+```
+
+### Install local builds
+For that, just use DNF:
+```bash
+$ dnf install -y path/to/create/rpm/files
+```
+
+E.g.:
+```
+$ dnf install -y \
+ packaging/RPMS/noarch/leapp-upgrade-el8toel9-0.21.0-0.202411131807Z.05f15b28.actor_config.el8.noarch.rpm \
+ packaging/RPMS/noarch/leapp-upgrade-el8toel9-deps-0.21.0-0.202411131807Z.05f15b28.actor_config.el8.noarch.rpm
+```
+
+Note that to install packages from the leapp-repository build you also the leapp
+packages installed or available. If you do not have a local builds of leapp
+created manually, you can use the upstream [@oamg/leapp](https://copr.fedorainfracloud.org/coprs/g/oamg/leapp/)
+COPR repository.
+
+## Public COPR repository
+The [@oamg/leapp](https://copr.fedorainfracloud.org/coprs/g/oamg/leapp/) COPR
+repository contains builds for the leapp and leapp-repository projects.
+
+Builds in the repository are created automatically by Packit when
+* a PR is opened/updated
+ * building for first time contributors needs to be approved by members of the upstream
+ * build is made from the PR branch
+ * note that the RPM release for PR builds starts with `0.` and contains
+ substring `.prX.`, where the X is the PR number
+* the `main` branch is updated / a PR is merged
+ * build is made from the `main` branch and it's considered to be the
+ upstream build
+ * the rpm release starts with `100.`
+
+Note that builds in COPR are automatically removed after 2-3 weeks but the build
+with the highest [NEVRA](https://metacpan.org/pod/RPM::NEVRA)
+which is considered to be the most up-to-date upstream build.
+All PR builds has automatically lower NEVRA than any upstream build, so they
+are always cleaned when they are considered expired by COPR.
+
+The upstream members can trigger building in COPR manually for a PR by comment
+```
+/packit copr-build
+```
+
+Note that this repository is supposed to be used only for the development and
+testing purposes.
+
+### Installing builds from the COPR repository
+To add the upstream [@oamg/leapp](https://copr.fedorainfracloud.org/coprs/g/oamg/leapp/)
+COPR repository to your system, execute:
+```bash
+# dnf copr enable "@oamg/leapp"
+```
+
+Or just install one of EPEL X files you can find on the COPR repo page - see the
+`Repo Download` column. (Fedora builds are only for the leapp project).
+
+To install latest upstream build, just run:
+```bash
+$ dnf install -y leapp-upgrade
+```
+
+To install latest build in the repo for the PR number X:
+```bash
+$ dnf install -y "leapp-upgrade-*.prX.*"
+```
+
+In similar way you can install particular `leapp` packages if you want any
+specific build.
+
+#### Instructions for for non-intel architectures
+All packages are `noarch` (architecture agnostic). To save a time and resources
+we build packages just for the x86\_64 repository.
+So in case you use a different architecture (IBM Z, Power, ARM)
+replace the `$basearch` variable in the repo file by static `x86_64`.
diff --git a/docs/source/libraries-and-api.md b/docs/source/libraries-and-api.md
new file mode 100644
index 0000000000..ae9888b523
--- /dev/null
+++ b/docs/source/libraries-and-api.md
@@ -0,0 +1,2 @@
+# Libraries and API
+TBD
diff --git a/docs/source/project-structure.rst b/docs/source/project-structure.rst
new file mode 100644
index 0000000000..3d298b4ae4
--- /dev/null
+++ b/docs/source/project-structure.rst
@@ -0,0 +1,19 @@
+Project structure
+=================
+TBD
+
+.. toctree::
+ :maxdepth: 4
+ :caption: Contents:
+ :glob:
+
+ repositories
+ data
+ cli
+
+.. Indices and tables
+.. ==================
+..
+.. * :ref:`genindex`
+.. * :ref:`modindex`
+.. * :ref:`search`
diff --git a/docs/source/target-userspace-creator.md b/docs/source/target-userspace-creator.md
new file mode 100644
index 0000000000..8b2ccb3d24
--- /dev/null
+++ b/docs/source/target-userspace-creator.md
@@ -0,0 +1,82 @@
+# Target userspace creator
+The very core of a RHEL upgrade process is installing packages of the target
+system. When these packages are built, however, they expect that they will
+be installed on a target system not on some old RHEL with an old package
+manager. Therefore, they can use some of the newer features of RPM such as rich
+dependencies, etc. Therefore, attempting to use RHEL 7 RPM stack to install RHEL 8
+RPMs might not work at all.
+
+Therefore, leapp downloads and sets up a very bare-bones installation of the target
+system, commonly referred to as _target userspace_. The _Target userspace creator_ is
+then the actor responsible performing the entire set up of the userspace. To set up
+a minimal target system, one needs access to target repositories, so that the packages
+constituting the bare bones system can be downloaded and installed.
+
+## Scratch container
+### When we want to modify the source system, but we also don't want to
+
+As introduction foreshadows, we need to modify the source system in order to
+achieve access to target repositories. However, modifying key configuration
+of the source system such as the repositories defined in `/etc/yum.repos.d`
+can be problematic, as the tool doing these temporary modifications needs to
+gracefully roll back these changes even in the presence of unforeseen problems.
+Speaking plainly, errors in leapp and unforeseen external commands cannot result
+in the source system losing repository access after a failed attempted upgrade.
+Therefore, leapp uses an [OverlayFS](https://www.kernel.org/doc/html/latest/filesystems/overlayfs.html)
+filesystem with the lower `lowerdir` being source system's `/`. This filesystem
+is mounted at `/var/lib/leapp/scratch/mounts/root_/system_overlay`.
+If you look at the mount target during certain points in the upgrade,
+the path would contain a root file hierarchy as if the `/` of the source system was bind-mounted there.
+However, any changes performed by leapp in `/var/lib/leapp/scratch/mounts/root_/system_overlay`,
+are not reflected in `/` of the root system, and, instead, they
+are written to `/var/lib/leapp/scratch/mounts/root_/upper`. The situation is a
+bit more nuanced, since every mounted device of the source filesystem has to
+have its own OverlayFS mount, but the principle-use OverlayFS mounts to seemingly
+modify source system-remains the same.
+
+To trick various utilities used by leapp to use the (modified) root hierarchy mounted at
+`/var/lib/leapp/scratch/mounts/root_/system_overlay` instead of the actual `/`, all external
+commands that modify the source `/`, or need to subsequently work with a modified `/` are
+executed with a `systemd-nspawn` container. This container, commonly referred to as the _scratch container_,
+uses the root filesystem present at `/var/lib/leapp/scratch/mounts/root_/system_overlay`
+is used as the root of the container using
+the `-D` option.
+
+#### An important detail in how is the Scratch container set up
+If we attempt to perform the actual download and installation of the target userspace,
+having the scratch container set up as described above, as
+```
+dnf install --installroot /var/lib/leapp/elXuserspace dnf
+```
+we realize there is a problem with the mounting scheme.
+Although the command will go through just fine, it will have a
+different effect than we expected. Since we are in an overlay, after the command
+finishes, there will be no `/var/lib/leapp/elXuserspace` (from the perspective of the host/source system)
+since all modifications
+are being written to overlay's upper directories. Therefore, we have to perform an
+additional bindmount of source system's `/var/lib/leapp/elXuserspace`
+to `/var/lib/leapp/scratch/installroot`. Therefore, if you look at leapp's logs, you will see a slightly
+mysterious command that installs target RHEL's dnf into `/installroot`.
+
+#### A comprehensive example of what is mounted where in the scratch container
+Consider a source system with the following file system table:
+
+| Device | Mounted at |
+|-------- |-------- |
+| `/dev/vda1` | `/` |
+| `/dev/vda2` | `/boot` |
+| `/dev/vda3` | `/var` |
+
+Leapp would create the scratch container as follows:
+
+| Source system mountpoint | OverlayFS lower dir | OverlayFS upper dir | OverlayFS work dir |
+|--------------------------|---------------------|--------------------- |-------------------- |
+| `/` | `/` | `/var/lib/leapp/scratch/mounts/root_/upper` | `/var/lib/leapp/scratch/mounts/root_/work` |
+| `/boot` | `/boot` | `/var/lib/leapp/scratch/mounts/root_boot/upper` | `/var/lib/leapp/scratch/mounts/root_boot/work` |
+| `/var` | `/var` | `/var/lib/leapp/scratch/mounts/root_var/upper` | `/var/lib/leapp/scratch/mounts/root_var/work` |
+
+### Target repositories and how are they obtained
+> This section is currently under construction
+
+### Broken symbolic links
+> This section is currently under construction
diff --git a/docs/source/tutorials/howto-first-actor-upgrade.md b/docs/source/tutorials/howto-first-actor-upgrade.md
new file mode 100644
index 0000000000..dc62056b15
--- /dev/null
+++ b/docs/source/tutorials/howto-first-actor-upgrade.md
@@ -0,0 +1,101 @@
+# Writing an Actor for Leapp Upgrade
+
+An **actor** is the core unit of execution in a Leapp upgrade workflow. If
+something needs to be done during an upgrade, you likely need to create an
+actor. A general overview of writing actors can be found in [How to Write an
+Actor](TODO). This guide focuses on the specifics of writing actors for the
+Leapp Repository.
+
+## Formulate Your Requirements
+
+The first step is to clearly define what you want to accomplish. Typically, the
+process involves:
+
+- Gathering system information
+- Notifying the user about a change (via a ``Report``)
+- Implementing the actual change during the upgrade
+
+```{note}
+### Case Study: Formulating Requirements
+
+Suppose there's an application that changes behavior when upgrading from RHEL X
+to RHEL Y. We need to adjust the configuration in `/etc/myapp/conf.ini`, but
+only on specific systems. Say those using BIOS and are somehow *special*. For
+the sake of an example, a system is considered *special* if the file
+`/etc/special` exists.
+
+Steps:
+1. Detect if the system is *special* (i.e., check if `/etc/special` exists)
+2. Detect if the system is running on BIOS
+3. Notify the user about a potentially breaking change
+4. Perform the configuration change
+```
+
+While these steps are interconnected, they may not all be implemented within a
+single actor. It might be necessary to distribute them across different actors
+in different phases of the upgrade process.
+
+## Scout the Environment
+
+Before implementing an actor, check if the necessary information is already
+being collected by an existing actor or model in the repository. This can save
+time and reduce redundancy.
+
+```{note}
+### Case Study: Scouting the Environment
+
+To check if Leapp already provides information about the system running on
+BIOS, you could search for "bios" in the Leapp Repository like
+
+``grep -r "bios" repos/``
+
+This search will lead you to the `FirmwareFacts` model, which contains exactly
+the relevant information.
+```
+
+Many useful functions are also already available in libraries. Be sure to
+review these before starting your implementation. For an overview consult
+[Leapp Upgrade Libraries](TODO)
+
+
+## Determine Implementation Details
+
+Once you’ve identified the reusable components, it’s time to start coding. You
+should address the following questions during this stage:
+
+- **What ``Model``s do I need to create?**
+
+ Models are the primary means by which actors communicate and exchange
+ information. Refer to [How to Create Models](TODO) for guidance.
+
+- **Which actors will my actor interact with?**
+
+- **Which phase should my actor belong to?**
+
+ Refer to the [Phases Overview](TODO) for details on phase organization.
+
+
+## Where to Place Your Actors
+
+Deciding where to place your actor’s code depends on its scope:
+
+- **Upgrade-specific code:** If your actor is relevant only for upgrading from
+ RHEL X to RHEL Y, place it in `repos/system_upgrade/elXtoelY`.
+
+- **Common code:** If your actor is applicable to all system upgrades, place it
+ in `repos/system_upgrade/common`. This actor will be executed regardless of the
+ upgrade path.
+
+The same applies for models, library functions and other resources.
+
+
+```{note}
+### Case Study: Actor Placement
+
+You are creating two actors: `FirstActor` and `SecondActor`.
+
+- `FirstActor` performs tasks applicable to all upgrades and should be placed
+ in `repos/system_upgrade/common`.
+- `SecondActor` is specific to the upgrade from RHEL 9 to RHEL 10, so it should
+ be placed in `repos/system_upgrade/el9toel10`.
+```
diff --git a/docs/source/tutorials/index.rst b/docs/source/tutorials/index.rst
new file mode 100644
index 0000000000..68b13d81bf
--- /dev/null
+++ b/docs/source/tutorials/index.rst
@@ -0,0 +1,17 @@
+Tutorials
+=========
+
+.. toctree::
+ :maxdepth: 4
+ :caption: Contents:
+ :glob:
+
+ templates/index
+ howto-first-actor-upgrade
+
+.. Indices and tables
+.. ==================
+..
+.. * :ref:`genindex`
+.. * :ref:`modindex`
+.. * :ref:`search`
diff --git a/docs/source/tutorials/templates/add-kernel-driver.md b/docs/source/tutorials/templates/add-kernel-driver.md
new file mode 100644
index 0000000000..698bfcb27d
--- /dev/null
+++ b/docs/source/tutorials/templates/add-kernel-driver.md
@@ -0,0 +1,63 @@
+# Install a kernel driver during the upgrade
+
+Note that usually when someone wants to install particular kernel driver,
+it's expected that the driver is needed to be used also during the in-place
+upgrade as well as on the upgraded system.
+
+```python
+from leapp.actors import Actor
+from leapp.models import (
+ KernelModule,
+ RpmTransactionTasks,
+ TargetInitramfsTasks,
+ TargetUserSpaceUpgradeTasks,
+ UpgradeInitramfsTasks
+)
+from leapp.tags import ChecksPhaseTag, IPUWorkflowTag
+
+
+# AI: do not forget to change the class name when applied!
+class AddKernelDriverMYDRIVER(Actor):
+ """
+ Install the driver during the upgrade
+
+ Install the kernel module in the upgrade & target initramfs.
+ In this scenario it requires the package with the module is installed
+ on the target system and inside the target userspace container.
+
+ In case of the scenario when the module should be copied from a directory
+ existing on the host system, specify the path from where it should
+ be copied/installed instead, e.g.:
+ KernelModule(name='', module_path='/path/to/the/module')
+ and in such a case, most likely you will want to drop some parts of the
+ code as well when you do not need to install any additional rpms explicitly.
+ """
+
+ # AI: do not forget to change the name when applied!
+ name = 'add_kernel_driver_'
+ consumes = ()
+ produces = (RpmTransactionTasks, TargetInitramfsTasks, TargetUserSpaceUpgradeTasks, UpgradeInitramfsTasks)
+ tags = (IPUWorkflowTag, ChecksPhaseTag)
+
+ def process(self):
+ # IMPORTANT: For the installation of these packages the (custom) repository
+ # must be enabled (used) for the IPU process! For the third party
+ # packages, ideal solution is to define such dnf repos inside the
+ # /etc/leapp/files/leapp_upgrade_repositories.repo file or using the
+ # --enablerepo option when running leapp (check documentation for the
+ # difference).
+ # This will create task to install the package with desired driver
+ # into the target userspace container
+ # - could be e.g. kmod-
+ self.produce(TargetUserSpaceUpgradeTasks(install_rpms=['']))
+
+ # and we want the package to be installed also during the upgrade,
+ # so the driver can be used also on the upgraded system
+ self.produce(RpmTransactionTasks(to_install=['']))
+
+ # this will require installation of the module in the upgrade and the
+ # target initramfs
+ k_module = KernelModule(name='')
+ self.produce(UpgradeInitramfsTasks(include_kernel_modules=[k_module]))
+ self.produce(TargetInitramfsTasks(include_kernel_modules=[k_module]))
+```
diff --git a/docs/source/tutorials/templates/execute-custom-script.md b/docs/source/tutorials/templates/execute-custom-script.md
new file mode 100644
index 0000000000..a36e0d9df0
--- /dev/null
+++ b/docs/source/tutorials/templates/execute-custom-script.md
@@ -0,0 +1,86 @@
+# Execute custom script during the upgrade
+
+For some people it could be tricky to write a code in Python and in some cases
+they prefer to perform e.g. their shell script during the upgrade. And in some
+cases you the code in bash could be just much more simple, when using tools
+available on the system. Well, you will always need to do some Python code,
+but in case you do not need anything else, just execute the code in the right
+phase of the upgrade, here is the minimal actor to do so.
+
+For more tips, check our actors how they work with the `run` function. There
+are many useful examples:
+ [system\_upgrade\_common repo](https://github.com/oamg/leapp-repository/tree/main/repos/system\_upgrade/common/actors)
+
+The full list of existing phases in the `IPUWorkflow` and their tags see [IPUWorkflow](https://github.com/oamg/leapp-repository/blob/main/repos/system_upgrade/common/workflows/inplace_upgrade.py)
+
+[//]: # (TODO: replace the URL by the link to upstream documentation.)
+
+```python
+from leapp.actors import Actor
+from leapp.libraries.stdlib import api, CalledProcessError, run
+
+# AI: replace PhaseTag by a valid phase tag.
+from leapp.tags import PhaseTag, IPUWorkflowTag
+
+# AI: change the name of the class when applied!!
+class ExecuteMyCustomScript(Actor):
+ """
+ This actor executes a script (or whatever executable command).
+
+ The actor is executed during the execution of the specified phase.
+ You can specify your script as path to the executable file, just
+ the name of the executable file if covered by PATH. If it's a custom script,
+ we suggest to store it under this actor directory in path:
+ tools/
+ so the directory with actor contains at least:
+ actor.py
+ tools/
+ ensure the file has set executable permission! In such a case, during
+ the actor execution you can call just to execute it
+ """
+
+ # AI: change the name when applied!!
+ name = 'execute\_my\_custom\_script'
+ consumes = ()
+ produces = ()
+ tags = (IPUWorkflowTag, PhaseTag)
+
+ def process(self):
+ # Specify the command that should be executed.
+ # Pipelines are not allowed. It should be simple command. Each option
+ # need to be a different item in the array. The first item is the
+ # executable. Example:
+ # command = ['/usr/bin/echo', '-E', 'I have been executed...']
+ command = ['']
+ try:
+ #
+ run(command)
+ except CalledProcessError as e:
+ # This happens if the command ends with non-zero exit code
+ self.current_logger().error('')
+ details = {
+ 'details': str(err),
+ 'stderr': err.stderr,
+ 'stdout': err.stdout
+ }
+ # Here you can decide what to do next. E.g. If you want to end with
+ # error and stop the upgrade process, uncomment the raise of exception
+ # below.
+ # # Note that usually you do not want to raise this error after the
+ # # upgrade DNF transaction has been performed as the system usually
+ # # ends just in emergency mode and more broken state.
+ # # In short, it is safe in phases prior the first reboot.
+ # raise StopActorExecutionError('Your error msg', details=details)
+
+ except OSError as e:
+ # This can happen just if the command is not possible to execute.
+ # E.g. the executable does not exist, it has not set executable
+ # mode, etc.
+ self.current_logger().error(
+ 'Cannot execute cmd "{}": {}'
+ .format(command, str(e))
+ )
+ # Similarly, in case you want to stop the upgrade execution with error:
+ #
+ # raise StopActorExecutionError('Your err msg')
+```
diff --git a/docs/source/tutorials/templates/index.rst b/docs/source/tutorials/templates/index.rst
new file mode 100644
index 0000000000..e2938cef31
--- /dev/null
+++ b/docs/source/tutorials/templates/index.rst
@@ -0,0 +1,38 @@
+Templates
+=========
+
+Here you can find out various templates (examples) of actors that are covering
+some common situations that people want to deal with during in-place upgrades.
+Templates contains usually comments with additional explanations providing clues
+what people want to do most likely in particular actors. Sometimes you will
+want to possibly look at several templates and mix them to get you solution.
+
+Our goal is to provide hints to people how they could create some actors
+to cover some typical scenarios. Note that templates can be updated over time
+as overall in-place upgrade solution is changed. So it's good to check
+documentation for the particular leapp-repository version you have installed
+on the system (do not exchange the version of leapp-repository with leapp!). E.g.:
+
+Note these templates do not meet best practices for the actor development in
+the official **leapp-repository** repository - to keep them short and simple.
+
+```bash
+rpm -qa "leapp-upgrade*"
+```
+
+ TODO: make a link to best practices documentation.
+
+.. toctree::
+ :maxdepth: 4
+ :caption: Contents:
+ :glob:
+
+ add-kernel-driver
+ execute-custom-script
+
+.. Indices and tables
+.. ==================
+..
+.. * :ref:`genindex`
+.. * :ref:`modindex`
+.. * :ref:`search`
diff --git a/docs/source/upgrade-architecture-and-workflow.md b/docs/source/upgrade-architecture-and-workflow.md
new file mode 100644
index 0000000000..34329d55e7
--- /dev/null
+++ b/docs/source/upgrade-architecture-and-workflow.md
@@ -0,0 +1,2 @@
+# In-place upgrade architecture and workflow
+TBD
diff --git a/docs/source/upgrade-architecture-and-workflow/dracut-modules-and-upgrade-initramfs.md b/docs/source/upgrade-architecture-and-workflow/dracut-modules-and-upgrade-initramfs.md
new file mode 100644
index 0000000000..8bee92b7ab
--- /dev/null
+++ b/docs/source/upgrade-architecture-and-workflow/dracut-modules-and-upgrade-initramfs.md
@@ -0,0 +1,62 @@
+# Leapp dracut modules and upgrade initramfs
+The actual upgrade of RPMs in leapp happens in an upgrade initramfs. In RHEL
+[dracut](https://github.com/dracutdevs/dracut) is used for building initramfs
+and it's also used by leapp.
+
+```{note}
+This document documents the traditional leapp initramfs approach, not the
+experimental livemode initramfs, although some of the information holds true
+for livemode too.
+```
+
+The primary reasons for using an initramfs are that it is isolated and in our
+full control. We can decide what kernel/dracut modules, scripts, etc. are
+included and also allow actors to influence that using messages. We can also
+decide what runs and doesn't run there. This is important to make sure no
+other services interfere with the upgrade.
+
+Systemd is used inside the upgrade initramfs to start leapp's `upgrade.service`
+systemd service at the appropriate time when we are sure all the required setup
+has completed. Currently the service requires `basic.target` and
+`sysroot.mount`.
+
+The actual DNF transaction installs the packages downloaded in the
+pre-initramfs part of the upgrade via leapp's DNF plugin. The target userspace
+is mounted by the plugin and the upgrade transaction is executed. Applications
+and third-party applications are also upgraded in the initramfs.
+
+The final step in the initramfs is preparation for booting into the target
+system. This includes tasks such as creating the leapp-resume.service, target
+initramfs generation, selinux relabeling, enabling/disabling systemd services...
+
+## Preparing the generation of initramfs
+The `commonleappdracutmodules` actor is responsible for the preparation of
+initramfs generation. It produces tasks with information about which RPMs
+(dracut, mdadm, lvm2, ...) necessary for building the initramfs need to be
+installed and which dracut and kernel modules need to be included. At minimum
+the following 2 modules are included:
+- `85sys-upgrade-redhat` - mounts the `/usr` filesystem inside initramfs and
+runs the actual upgrade
+- `90sys-upgrade` - contains the upgrade.service and upgrade.target, the
+service then runs upgrade scripts from `85sys-upgrade-redhat`
+
+### Including custom dracut and kernel modules
+Actors and custom actors can produce messages to include custom dracut
+modules as well as kernel modules in the upgrade initramfs. See [TBD
+link](templates) for examples on how to write such actors.
+
+TBD - add/link the doc to the relevant models here
+
+## Generating the initramfs
+The initramfs is built by the `upgradeinitramfsgenerator` actor. It collects
+and installs the required RPMs, collects and includes kernel and dracut modules
+and copies required files (e.g. the initramfs generator script) from host to
+the target userspace container. Generates the initramfs using `dracut` and
+copies it to `/boot`.
+
+## Network in initramfs
+Currently networking support in the initramfs is experimental. See [TDB link
+LEAPP_DEVEL_INITRAM_NETWORK]() for more information.
+
+## Debugging inside initramfs
+See [TDB link]() for detailed information about initramfs debugging.
diff --git a/docs/source/upgrade-architecture-and-workflow/index.rst b/docs/source/upgrade-architecture-and-workflow/index.rst
new file mode 100644
index 0000000000..32552452ec
--- /dev/null
+++ b/docs/source/upgrade-architecture-and-workflow/index.rst
@@ -0,0 +1,18 @@
+In-place upgrade architecture and workflow
+=====================================================================
+TBD
+
+.. toctree::
+ :maxdepth: 4
+ :caption: Contents:
+ :glob:
+
+ dracut-modules-and-upgrade-initramfs
+
+
+.. Indices and tables
+.. ==================
+..
+.. * :ref:`genindex`
+.. * :ref:`modindex`
+.. * :ref:`search`