Improve Docker scripts to support any project

- Great for testing Elixir on smaller projects

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

README.md

@@ -131,10 +131,18 @@ Building Docker images
 ----------------------
 
 Docker files are provided in the "docker/" directory. To generate your own
-Docker image for indexing the Linux kernel sources (for example),
+Docker image for indexing the sources of a project (for example for the Musl
-download the "Dockerfile" file for your target distribution and run:
+project which is much faster to index that Linux), download the "Dockerfile"
+file for your target distribution and run:
 
-    $ docker build -t elixir --build-arg GIT_REPO_URL=git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git .
+    $ docker build -t elixir --build-arg GIT_REPO_URL=git://git.musl-libc.org/musl --build-arg PROJECT=musl .
+
+Then you can use your new container as follows (you get the container id from the output of "docker build"):
+
+    $ docker run <container-id>
+
+You can the open the below URL in a browser on your host: http://172.17.0.2/musl/latest/source
+(change the container IP address if you don't get the default one)
 
 Hardware requirements
 ---------------------

docker/centos/Dockerfile

@@ -13,10 +13,14 @@ LABEL author="David.Southwick@cern.ch"
 USER root
 
 ARG GIT_REPO_URL
+ARG PROJECT
 
 RUN \
     : "${GIT_REPO_URL:?set GIT_REPO_URL to the repo git url}"
 
+RUN \
+    : "${PROJECT:?set PROJECT to set the project name}"
+
 RUN \
     echo "repo url to index: ${GIT_REPO_URL}"
 
@@ -34,12 +38,12 @@ RUN \
   git clone https://github.com/bootlin/elixir.git /usr/local/elixir/
 
 RUN \
-  mkdir -p /srv/elixir-data/linux/repo && \
+  mkdir -p /srv/elixir-data/$PROJECT/repo && \
-  mkdir -p /srv/elixir-data/linux/data && \
+  mkdir -p /srv/elixir-data/$PROJECT/data && \
-  git clone "${GIT_REPO_URL}" /srv/elixir-data/linux/repo/
+  git clone "${GIT_REPO_URL}" /srv/elixir-data/$PROJECT/repo/
 
-ENV LXR_REPO_DIR /srv/elixir-data/linux/repo
+ENV LXR_REPO_DIR /srv/elixir-data/$PROJECT/repo
-ENV LXR_DATA_DIR /srv/elixir-data/linux/data
+ENV LXR_DATA_DIR /srv/elixir-data/$PROJECT/data
 
 RUN \
   cd /usr/local/elixir/ && \
@@ -47,7 +51,6 @@ RUN \
   ./update.py
 
 # apache elixir config, see elixir README
-# NB: Change /linux/ to the name of the project you want as default shown
 # apache HttpProtolOptions workaround
 RUN \
   echo $'<Directory /usr/local/elixir/http/>\n\
@@ -62,7 +65,7 @@ AddHandler cgi-script .py\n\
     ServerName MY_LOCAL_IP\n\
     DocumentRoot /usr/local/elixir/http\n\
     RewriteEngine on\n\
-    RewriteRule "^/$" "/linux/latest/source" [R]\n\
+    RewriteRule "^/$" "/$PROJECT/latest/source" [R]\n\
     RewriteRule "^/.*/(source|ident|search)" "/web.py" [PT]\n\
 </VirtualHost>' > /etc/httpd/conf.d/000-elixir.conf \
 && echo -e "\nHttpProtocolOptions Unsafe" >> /etc/httpd/conf/httpd.conf

docker/debian/Dockerfile

@@ -1,9 +1,13 @@
 FROM debian:latest
 ARG GIT_REPO_URL
+ARG PROJECT
 
 RUN \
     : "${GIT_REPO_URL:?set GIT_REPO_URL to the repo git url}"
 
+RUN \
+    : "${PROJECT:?set PROJECT to set the project name}"
+
 RUN \
     echo "repo url to index: ${GIT_REPO_URL}"
 
@@ -26,12 +30,12 @@ RUN \
   mkdir -p /srv/elixir-data/
 
 RUN \
-  mkdir -p /srv/elixir-data/linux/repo && \
+  mkdir -p /srv/elixir-data/$PROJECT/repo && \
-  mkdir -p /srv/elixir-data/linux/data && \
+  mkdir -p /srv/elixir-data/$PROJECT/data && \
-  git clone "${GIT_REPO_URL}" /srv/elixir-data/linux/repo/
+  git clone "${GIT_REPO_URL}" /srv/elixir-data/$PROJECT/repo/
 
-ENV LXR_REPO_DIR /srv/elixir-data/linux/repo
+ENV LXR_REPO_DIR /srv/elixir-data/$PROJECT/repo
-ENV LXR_DATA_DIR /srv/elixir-data/linux/data
+ENV LXR_DATA_DIR /srv/elixir-data/$PROJECT/data
 
 RUN \
   cd /usr/local/elixir/ && \