Adding alpine image

FossilOrigin-Name: ac23c605902ec4d03651a8bd0f103f543bfbf6db9382a5abfa21d965a555338e

Makefile

@@ -1,5 +1,5 @@
 TANGLE=tclsh scripts/tangle.tcl
-DOCKERFILES=ubi9+epel.dockerfile ubuntu.dockerfile fossil.dockerfile
+DOCKERFILES=ubi9+epel.dockerfile ubuntu.dockerfile fossil.dockerfile opensuse.dockerfile alpine.dockerfile
 
 .SUFFIXES: .md .dockerfile
 

README.md

@@ -30,6 +30,10 @@ I like to insure that my containers follow a few simple rules.
    * Yes, I use Ubuntu from time to time. 
  * [fossil](fossil.md)
    * I use fossil quite a bit. Nice to have an easy way to run it. I would recommend use the Dockerfile provide by fossil. I have this one here to highlight the usage of the scratch docker image. 
+ * [opensuse](opensuse.md)
+   * OpenSuse is my favorite development Linux distrobution. 
+ * [alpine](alpine.md)
+   * Need a good base alpine image to use for deployments.
 
 ## As always, go Guardians!
 

alpine.md

@@ -0,0 +1,113 @@
+# A simple base docker image for Alpine. 
+20230410
+
+My Alpine Docker Images are pretty standard. Nothing specific here.
+
+
+## Alpine Docker Image
+
+### Setup FROM and enable a version choice.
+
+First let's set the where we'll pull from. I use `podman` and `docker` equally, so on I give the full path to the FROM image.
+
+An `ARG` for the version, `VER` is there. This can be overridden with `--build-arg 'VER=<version>'`.
+
+```
+<<base.image>>=
+ARG VER=latest
+FROM docker.io/alpine:${VER}
+@  % def VER
+```
+
+### Setup user specific arguments.
+
+Setup a base username, uid, gid, and work directory with some defaults. All of these can be overridden with `-build-arg "ARG=VALUE"`.
+
+```
+<<base.userargs>>=
+ARG baseUSER="mat.kovach"
+ARG baseUID=5000
+ARG baseGID=5000
+ARG baseDIR="/work"
+@
+```
+
+### Add user and work directory
+
+You'll need to be careful here to not change a current directory. For example, do not set baseDIR="/bin". 
+
+Add the group, user, (with the home directory of the user ad the work directory) and insure the proper ownership on the work directory. 
+
+*Alpine requies you add the `shadow` package before using `groupadd`.*
+
+```
+<<base.alpinepre>>=
+RUN apk add --no-cache shadow
+@
+```
+
+
+```
+<<base.setupuser>>=
+RUN groupadd -g ${baseGID} ${baseUSER} &&      \
+    useradd -c 'work user' -m -u ${baseUID}    \
+    -g ${baseGID} -d ${baseDIR} ${baseUSER} && \ 
+    chown -R ${baseUID}:${baseGID} ${baseDIR}
+@
+```
+
+### Add repos and update software.
+
+First, we'll add any additional repo. If you have additional repos you want to 
+enable, add them here.
+
+```
+<<base.enablerepos>>=
+# nothing to do here, carry on!
+@
+```
+
+### Addtional root changes
+
+We are still root at this point, this is where we add software, make 
+additional changes, etc.
+
+```
+<<base.addsoftware>>=
+RUN apk update && apk upgrade --no-cache && \
+         apk add --no-cache ed tcl joe 
+@
+```
+
+The different sections are setup based on how often they may be changed. 
+The more likely some will change, the further down they should be to help 
+minimize the layers that need to be rebuilt.
+
+### Make sure we the user, volume, and workdir setup
+
+```
+<<base.end>>=
+USER ${baseUSER}
+VOLUME ${baseDIR}
+WORKDIR ${baseDIR}
+# you can add entry point, etc. here.
+@
+```
+
+### Pulling it all together
+
+```
+<<alpine.dockerfile>>=
+<<base.image>>
+<<base.userargs>>
+<<base.alpinepre>>
+<<base.setupuser>>
+<<base.enablerepos>>
+<<base.addsoftware>>
+<<base.end>>
+@
+```
+## build and test
+`docker build -t mek:alpine -f alpine.dockerfile .`
+`docker run --rm -it mek:alpine /bin/sh``
+```