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diff --git a/contrib/build-using-docker/README.md b/contrib/build-using-docker/README.md
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--- a/contrib/build-using-docker/README.md
+++ b/contrib/build-using-docker/README.md
@@ -2,28 +2,59 @@
Showcase how to build and install
=================================
-Make and install inside a dockerimage.
+Sometimes happy developers (like me) have no choice but using horribly
+restricted systems where setting up tools to run even something as simple as
+configure/make/install becomes a nightmare. I found it to be easier to have a
+Dockerfile to build on a totally unrelated machine (but where I have the needed
+privileges) and then just copy-paste the built result over to where I need it.
+
+
+## Setup variable to reduce annoying repetitions
```sh
- curl -sSL http://git.hiddenalpha.ch/bulk-ln.git/plain/contrib/build-using-docker/Dockerfile | sudo docker build . -f -
+IMG=bulk-ln-showcase:latest
```
-Afer that we can use the image hash printed in last line to refer to our built
-image (replace IMG_REF in commands below by that hash). Alternatively we could
-add [`--tag`](https://docs.docker.com/engine/reference/commandline/build/)
-option to our build command to give the resulting image a name.
+## Make and install dockerimage
+
+```sh
+curl -sSL http://git.hiddenalpha.ch/bulk-ln.git/plain/contrib/build-using-docker/Dockerfile | sudo docker build . -f - -t "${IMG:?}"
+```
+
+## Grab distribution archive
Most probably we wanna get the distribution archive. We can copy it out the
dockerimage to our host using:
```sh
- sudo docker run --rm -i IMG_REF sh -c 'true && cd dist && tar c *' | tar x
+sudo docker run --rm -i "${IMG:?}" sh -c 'true && cd dist && tar c *' | tar x
```
+
+## Play around
+
Or if we wanna browse the image or play around with the built utility we could
launch a shell. Once in the shell, try `bulk-ln --help`.
```sh
- sudo docker run --rm -ti IMG_REF sh
+sudo docker run --rm -ti "${IMG:?}" sh
+```
+
+
+## Other targets
+
+The dockerfile is parameterized and should work for other systems too. For
+example to compile for debian we could use command like below. May set *IMG*
+differently if you need to keep multiple images.
+
+```sh
+curl -sSL http://git.hiddenalpha.ch/bulk-ln.git/plain/contrib/build-using-docker/Dockerfile | sudo docker build . -f - -t "${IMG:?}" \
+ --build-arg PARENT_IMAGE=debian:buster-20220622-slim \
+ --build-arg PKGS_TO_ADD="curl gcc git make libc-dev ca-certificates tar" \
+ --build-arg PKGS_TO_DEL="curl gcc git make libc-dev ca-certificates" \
+ --build-arg PKGINIT="apt update" \
+ --build-arg PKGADD="apt install -y --no-install-recommends" \
+ --build-arg PKGDEL=true \
+ --build-arg PKGCLEAN="apt clean"
```