Fix #1, #2, #3 - Script update, params, documentaion and test scripts

Signed-off-by: Bala Raman <srbala@gmail.com>

Dockerfile

@@ -1,7 +1,11 @@
+# ----------------------------------------------------------------------------
+# Multi stage build, using Micro version AlmaLinux as foundation for end image
+# Final image designed for specific purposes, don't have dnf, microdnf or yum
+# ----------------------------------------------------------------------------
 FROM almalinux:8 as builder
 
 RUN mkdir -p /mnt/system-root /mnt/system-root/build; \
-    dnf install --installroot /mnt/system-root  --releasever 8 --setopt=install_weak_deps=false --setopt=tsflags=nodocs -y coreutils-single \
+    dnf install --installroot /mnt/system-root  --releasever 8 --setopt=install_weak_deps=False --setopt=tsflags=nodocs -y coreutils-single \
     bash \
     glibc-minimal-langpack \
     anaconda-tui \
@@ -9,6 +13,7 @@ RUN mkdir -p /mnt/system-root /mnt/system-root/build; \
     jq \
     tar \
     policycoreutils \
+    # Optional include to avoid runtime warning -- starts
     libblockdev-mdraid  \
     libblockdev-crypto \
     libblockdev-lvm \
@@ -17,11 +22,13 @@ RUN mkdir -p /mnt/system-root /mnt/system-root/build; \
     libblockdev-loop \
     libblockdev-nvdimm \
     libblockdev-mpath \
+    # Optional include to avoid runtime warning -- ends
     rootfiles; \
     rm -rf /mnt/system-root/var/cache/* ; \
     dnf clean all; \
     cp /etc/yum.repos.d/* /mnt/system-root/etc/yum.repos.d/ ; \
     rm -rf /var/cache/yum; \
+    # TODO: commands below move to side script or remove?
     # generate build time file for compatibility with CentOS
     /bin/date +%Y%m%d_%H%M > /mnt/system-root/etc/BUILDTIME ;\
     # set DNF infra variable to container for compatibility with CentOS

README.md

@@ -5,8 +5,10 @@ This project provides the ability build `rootfs` file from `kickstart` input fil
 ## HOW-TO
 
 Image yet ot published in `hub.docker.com`, until then use local build.
+
 ### Building local
-```
+
+```sh
 docker build -t srbala/ks2rootfs .
 ```
 
@@ -14,9 +16,33 @@ docker build -t srbala/ks2rootfs .
 
 Following command uses the `kickstarts/almalinux-8-default.x86_64.ks` file to build.
 
-```
+```sh
 docker run --rm --privileged -v "$PWD:/build:z" \
     -e BUILD_KICKSTART=kickstarts/almalinux-8-default.x86_64.ks \
     -e BUILD_ROOTFS=almalinux-8-default-docker.x86_64.tar.gz \
     srbala/ks2rootfs
 ```
+
+### Environment variables
+
+Container startup script `ks2rootfs` supports multiple environment varible to customize the output. The environment variables and their use as follows
+
+```sh
+ENVIRONMENT VARIABLES:
+======================
+
+BUILD_KICKSTART  : Input kickstart source file (.ks) - Required
+BUILD_ROOTFS     : Rootfs output file name - Required
+
+BUILD_WORK_DIR   : Working dir for kickstart source and image destination (default current directory) - Optional
+BUILD_OUTDIR     : Output directory name in working dir - Optional
+BUILD_FLAG_OUTOUT_IN_PWD : Set this flag to true to write output files in current working directory. Default value is 'false'. When value is set to 'true', any value passed to 'BUILD_OUTDIR' will be ignored.
+BUILD_FLAG_WRITE_META    : Generate meta data about the kickstart build system - Optional
+BUILD_FLAG_RETAIN_LOG    : Retain generated output log files under 'logs' output directory - Optional
+
+USAGE:
+    ks2rootfs KICKSTART_FILE_NAME ROOTFS_FILE_NAME
+
+EXAMPLES:
+    ks2rootfs os-minimal.ks os-minimal.tar.xz
+```

scripts/ks2rootfs

@@ -5,28 +5,83 @@
 
 usage() {
     cat 1>&2 <<EOF
-Script to create roofs from kickstart file using livemedia-creator
+Script to create roofs file from a kickstart file using livemedia-creator
 
-ENVIRONMENT VARS:
-BUILD_WORK_DIR     Working dir for kickstart source and image destination (default current directory)
-BUILD_KICKSTART    Input kickstart source file (.ks)
-BUILD_ROOTFS       Rootfs output file name
+ENVIRONMENT VARIABLES:
+======================
+
+BUILD_KICKSTART  : Input kickstart source file (.ks) - Required
+BUILD_ROOTFS     : Rootfs output file name - Required
+
+BUILD_WORK_DIR   : Working dir for kickstart source and image destination (default current directory) - Optional
+BUILD_OUTDIR     : Output directory name in working dir - Optional
+BUILD_FLAG_OUTOUT_IN_PWD : Set this flag to true to write output files in current working directory. Default value is false. When value is set to `true`, any value passed to `BUILD_OUTDIR` will be ignored.
+BUILD_FLAG_WRITE_META    : Generate meta data about the kickstart build system - Optional
+BUILD_FLAG_RETAIN_LOG    : Retain generated output log files under 'logs' output directory - Optional
 
 USAGE:
     ks2rootfs KICKSTART_FILE_NAME ROOTFS_FILE_NAME
 
 EXAMPLES:
-    ks2rootfs centos8-minimal.ks centos8-minimal.tar.xz
+    ks2rootfs os-minimal.ks os-minimal.tar.xz
+EOF
+}
+
+run-summary() {
+    cat 1>&2 <<EOF
+
+ks2rootfs - Script input summary:
+
+FLAGS
+-----
+FLAG_OUTOUT_PWD : ${BUILD_FLAG_OUTOUT_IN_PWD}
+FLAG_WRITE_META : ${BUILD_FLAG_WRITE_META}
+FLAG_RETAIN_LOG : ${BUILD_FLAG_RETAIN_LOG}
+
+VARIABLES
+---------
+BUILD_WORK_DIR  : ${BUILD_WORK_DIR}
+BUILD_OUTDIR    : ${BUILD_OUTDIR}
+BUILD_LOGDIR    : ${BUILD_LOGDIR}
+INPUT_KICKSTART : ${BUILD_WORK_DIR}${BUILD_KICKSTART}
+OUTPUT_ROOTFS   : ${BUILD_OUTDIR}/${BUILD_ROOTFS}
+
 EOF
 }
 
 BUILD_WORK_DIR=${BUILD_WORK_DIR:-./}
 BUILD_KICKSTART=${BUILD_KICKSTART:-$1}
 BUILD_ROOTFS=${BUILD_ROOTFS:-$2}
-BUILD_OUTDIR=${BUILD_OUTDIR:-./result}
-BUILD_WRITE_META=${BUILD_WRITE_META:-true}
-BUILD_RETAIN_LOG=${BUILD_RETAIN_LOG:-false}
+BUILD_FLAG_WRITE_META=${BUILD_FLAG_WRITE_META:-true}
+BUILD_FLAG_RETAIN_LOG=${BUILD_FLAG_RETAIN_LOG:-false}
+BUILD_FLAG_OUTOUT_IN_PWD=${BUILD_FLAG_OUTOUT_IN_PWD:-false}
 
+USE_PWD_OUTPUT=${USE_PWD_OUTPUT:-false}
+
+BUILD_OUTDIR=${BUILD_OUTDIR:-result}
+BUILD_LOGDIR=${BUILD_OUTDIR}/logs
+
+if [ ${BUILD_FLAG_OUTOUT_IN_PWD} == 'true' ]; then
+    echo 'Build output files will be in current working folder ... ' 
+    BUILD_OUTDIR=${BUILD_WORK_DIR}
+else
+    BUILD_OUTDIR=${BUILD_WORK_DIR}${BUILD_OUTDIR:-result}
+    echo "Build output files will be in '${BUILD_OUTDIR}' folder ... " 
+    if [[ -d "${BUILD_OUTDIR}" ]]; then
+        echo "Output directory ${BUILD_OUTDIR} already exists, please remove it"
+        exit 1
+    fi
+    mkdir -p ${BUILD_OUTDIR}
+    if [[ -d "${BUILD_OUTDIR}" ]]; then
+        echo "Output directory ${BUILD_OUTDIR} created successfully"
+    else    
+        echo "Error in creating output directory: ${BUILD_OUTDIR}"
+        exit 1
+    fi
+fi
+
+
+BUILD_LOGDIR=${BUILD_OUTDIR}/logs
 
 if [ -z ${BUILD_KICKSTART} ] || [ -z ${BUILD_ROOTFS} ]
 then
@@ -35,6 +90,9 @@ then
   exit 1
 fi
 
+# Write run summary to console
+run-summary
+
 # set anaconda base product
 cat << _EOF > /etc/anaconda/product.d/ks2rootfs.conf
 # Anaconda configuration file for Kickstart to Rootfs.
@@ -53,25 +111,38 @@ eula =
 _EOF
 
 # create rootfs
-livemedia-creator --logfile="/tmp/rootfs-creator.log" \
+livemedia-creator --logfile="/tmp/ks2rootfs.log" \
     --make-tar --ks="${BUILD_WORK_DIR}/${BUILD_KICKSTART}" --no-virt \
     --image-only --image-name="${BUILD_ROOTFS}" \
     --anaconda-arg "--product Kickstart to Rootfs"
 
-# move rootfs to working dir
-cp -rp /var/tmp/${BUILD_ROOTFS} ${BUILD_WORK_DIR}/${BUILD_ROOTFS}
+# copy rootfs to working dir
+cp -rp /var/tmp/${BUILD_ROOTFS} ${BUILD_OUTDIR}/${BUILD_ROOTFS}
 
-# extract os-release info
-tar -xvf /var/tmp/${BUILD_ROOTFS} -C /tmp/ --strip-components=3 ./usr/lib/os-release
-os_release_id=$(awk -F= '$1=="ID" { print $2 ;}' /tmp/os-release | tr -d '"')
-distro_release=$(grep "${os_release_id}.*-release-" /tmp/anaconda/packaging.log | grep -o "Verifying:.*" | sed -n 's/Verifying: //p')
-
-if [ -z ${distro_release+x} ]; then
-    exit 1
+if [ ${BUILD_FLAG_WRITE_META} == 'true' ]; then
+    # extract os-release info
+    tar -xvf /var/tmp/${BUILD_ROOTFS} -C /tmp/ --strip-components=3 ./usr/lib/os-release
+    os_release_id=$(awk -F= '$1=="ID" { print $2 ;}' /tmp/os-release | tr -d '"')
+    distro_release=$(grep "${os_release_id}.*-release-" /tmp/anaconda/packaging.log | grep -o "Verifying:.*" | sed -n 's/Verifying: //p')
+    if [ -z ${distro_release+x} ]; then
+        exit 1
+    else
+        echo 'Writting meta data ... ' 
+        # save distro release info
+        echo "$distro_release" > ${BUILD_OUTDIR}/distro-release
+    fi
+    # save list of packages installed
+    jq .[] -r /tmp/dnf.cache/tempfiles.json | awk -F '/' '{print $5}' | sort > ${BUILD_OUTDIR}/pkgs-list
 else
-    # save distro release info
-    echo "$distro_release" > ${BUILD_WORK_DIR}/distro-release
+    echo 'Skip writing meta data based on configuration.' 
 fi
 
-# save list of packages installed
-jq .[] -r /tmp/dnf.cache/tempfiles.json | awk -F '/' '{print $5}' | sort > ${BUILD_WORK_DIR}/pkgs-list
+if [ ${BUILD_FLAG_RETAIN_LOG} == 'true' ]; then
+    rm -rf ${BUILD_LOGDIR}
+    mkdir -p ${BUILD_LOGDIR} ${BUILD_LOGDIR}/anaconda
+    echo "Copying logs to '${BUILD_LOGDIR}'" 
+    cp /tmp/ks2rootfs.log rm -rf ${BUILD_LOGDIR}/ks2rootfs.log 
+    cp -rp /tmp/anaconda/* ${BUILD_LOGDIR}/anaconda
+else
+    echo 'Skip writing logs data based on configuration (default). '
+fi

tests/kickstarts/almalinux-8-default.x86_64.ks

@@ -0,0 +1,99 @@
+# AlmaLinux 8 kickstart file for x86_64 base Docker image
+
+# install
+url --url https://repo.almalinux.org/almalinux/8/BaseOS/x86_64/os/
+
+lang en_US.UTF-8
+keyboard us
+timezone --nontp --utc UTC
+
+network --activate --bootproto=dhcp --device=link --onboot=on
+firewall --disabled
+selinux --disabled
+
+bootloader --disable
+zerombr
+clearpart --all --initlabel
+autopart --fstype=ext4 --type=plain --nohome --noboot --noswap
+
+rootpw --iscrypted --lock almalinux
+
+shutdown
+
+%packages --ignoremissing --excludedocs --instLangs=en --nocore  --excludeWeakdeps
+almalinux-release
+bash
+binutils
+coreutils-single
+dnf
+findutils
+glibc-minimal-langpack
+hostname
+iputils
+less
+rootfiles
+tar
+vim-minimal
+yum
+xz
+
+-brotli
+-crypto-policies-scripts
+-firewalld
+-diffutils
+-elfutils-debuginfod-client
+-gettext*
+-glibc-langpack-en
+-gnupg2-smime
+-grub\*
+-iptables
+-kernel
+-libevent
+-openssl
+-os-prober
+-open-vm-tools
+-pinentry
+-platform-python-pip
+-shared-mime-info
+-trousers
+-unbound-libs
+-xkeyboard-config
+%end
+
+
+%post --erroronfail --log=/root/anaconda-post.log
+# generate build time file for compatibility with CentOS
+/bin/date +%Y%m%d_%H%M > /etc/BUILDTIME
+
+# set DNF infra variable to container for compatibility with CentOS
+echo 'container' > /etc/dnf/vars/infra
+
+# import AlmaLinux PGP key
+rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-AlmaLinux
+
+# install only en_US.UTF-8 locale files, see
+# https://fedoraproject.org/wiki/Changes/Glibc_locale_subpackaging for details
+echo '%_install_langs en_US.UTF-8' > /etc/rpm/macros.image-language-conf
+
+# force each container to have a unique machine-id
+> /etc/machine-id
+
+# create tmp directories because there is no tmpfs support in Docker
+umount /run
+systemd-tmpfiles --create --boot
+
+# disable login prompt and mounts
+systemctl mask console-getty.service \
+               dev-hugepages.mount \
+               getty.target \
+               systemd-logind.service \
+               sys-fs-fuse-connections.mount \
+               systemd-remount-fs.service
+
+# remove unnecessary files
+rm -f /var/lib/dnf/history.* \
+      /run/nologin
+rm -fr /var/log/* \
+       /tmp/* /tmp/.* \
+       /boot || true
+%end