gen2stage4/gen2stage4

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#!/usr/bin/env bash
# get available compression types
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declare -A compressTypes
compressTypes=(
["bz2"]="bzip2 pbzip2 lbzip2"
["gz"]="gzip pigz"
["lrz"]="lrzip"
["lz"]="lzip plzip"
["lz4"]="lz4"
["lzo"]="lzop"
["xz"]="xz pixz"
["zst"]="zstd"
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)
declare -A compressAvail
for ext in "${!compressTypes[@]}"; do
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for exechk in ${compressTypes[${ext}]}; do
binchk=$(command -v "${exechk}")
if [[ -n "$binchk" ]]; then
compressAvail+=(["${ext}"]="$binchk")
fi
done
done
# set flag variables to null/default
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optExcludeBoot=false
optExcludeConfidential=false
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optExcludeLost=true
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optQuiet=false
optUserExclude=()
optUserInclude=()
optCompressType="bz2"
optSeperateKernel=false
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function showHelp() {
echo "Usage:"
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echo "$(basename "$0") [-b -c -k -l -q] [-C <type>] [-s || -t <target>] [-e <exclude>...] [-i <include>...] <archive> [-- [tar-opts]]"
echo "Position Arguments:"
echo " <archive> archive name to create with optional path"
echo " [tar-opts] additional options to pass to tar command"
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echo
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echo "Options:"
echo " -b excludes boot directory"
echo " -c excludes some confidential files (currently only .bash_history and connman network lists)"
echo " -k separately save current kernel modules and src (creates smaller targetArchives and saves decompression time)"
echo " -l includes lost+found directory"
echo " -q activates quiet mode (no confirmation)"
echo " -C <type> specify tar compression (default: ${optCompressType}, available: ${!compressAvail[*]})"
echo " -s makes archive of current system"
echo " -t <path> makes archive of system located at the <path>"
echo " -e <exclude> an additional exclude directory (one dir one -e, do not use it with *)"
echo " -i <include> an additional include. This has higher precedence than -e, -t, and -s"
echo " -h display this help message."
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if [[ "$1" -ge 0 ]]; then
exit "$1"
else
exit 0
fi
}
function errorMsg() {
local rc=0
if [[ "$1" -gt 0 ]]; then
rc="$1"
shift
fi
echo "$*" >&2
if [[ "$rc" -gt 0 ]]; then
exit "$rc"
fi
}
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# reads options:
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tarArgs=()
while [[ $# -gt 0 ]]; do
while getopts ":t:C:e:i:skqcblh" flag; do
case "$flag" in
t) targetPath="$OPTARG";;
s) targetPath="/";;
C) optCompressType="$OPTARG";;
q) optQuiet=true;;
k) optSeperateKernel=true;;
c) optExcludeConfidential=true;;
b) optExcludeBoot=true;;
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l) optExcludeLost=false;;
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e) optUserExclude+=("${OPTARG}");;
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i) optUserInclude+=("$OPTARG");;
h) showHelp 0;;
\?) errorMsg 1 "Invalid option: -$OPTARG";;
:) errorMsg 1 "Option -$OPTARG requires an argument.";;
esac
done || exit 1
[[ $OPTIND -gt $# ]] && break # reached the end of parameters
shift $((OPTIND - 1)) # Free processed options so far
OPTIND=1 # we must reset OPTIND
if [[ -z "$targetArchive" ]]; then
targetArchive=$1
else
tarArgs[${#tarArgs[*]}]=$1
fi
#args[${#args[*]}]=$1 # save first non-option argument (a.k.a. positional argument)
shift # remove saved arg
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done
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# checks if run as root:
if [[ "$(id -u)" -ne 0 ]]; then
echo "$(basename "$0"): must run as root"
exit 250
fi
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if [[ -z "$targetPath" ]]; then
echo "$(basename "$0"): no system path specified"
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exit 1
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fi
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# make sure targetPath path ends with slash
if [[ "$targetPath" != */ ]]; then
targetPath="${targetPath}/"
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fi
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# checks for correct output file specification
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if [[ -z "$targetArchive" ]]; then
echo "$(basename "$0"): no archive file name specified"
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exit 1
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fi
# determines if filename was given with relative or absolute path
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#if (($(grep -c '^/' <<< "$targetArchive") > 0)); then
if [[ "$targetArchive" =~ ^\/.* ]]; then
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stage4Filename="${targetArchive}"
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else
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stage4Filename="$(pwd)/${targetArchive}"
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fi
# Check if compression in option and filename
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if [[ -z "$optCompressType" ]]; then
echo "$(basename "$0"): no archive compression type specified"
exit 1
else
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#stage4Filename="${stage4Filename}.${optCompressType}"
stage4Ext="tar.${optCompressType}"
fi
# Check if specified type is available
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if [[ -z "${compressAvail[$optCompressType]}" ]]; then
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echo "$(basename "$0"): specified archive compression type not supported."
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echo "Supported: ${compressAvail[*]}"
exit 1
fi
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# Check if using seperate kernel archive option
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if $optSeperateKernel; then
optUserExclude+=("${targetPath}usr/src/*")
optUserExclude+=("${targetPath}lib*/modules/*")
fi
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# tarExcludes:
tarExcludes=(
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"dev/*"
"var/tmp/*"
"media/*"
"mnt/*/*"
"proc/*"
"run/*"
"sys/*"
"tmp/*"
"var/lock/*"
"var/log/*"
"var/run/*"
"var/lib/docker/*"
"var/lib/containers/*"
"var/lib/machines/*"
"var/lib/libvirt/*"
"var/lib/lxd/*"
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"home/*/*"
)
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tarExcludesPortage=(
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"var/db/repos/*/*"
"var/cache/distfiles/*"
"var/cache/binpkgs/*"
"usr/portage/*"
)
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tarIncludes=(
"dev/console"
"dev/null"
"var/db/pkg/*"
)
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tarExcludes=("${tarExcludes[@]/#/"$targetPath"}")
tarIncludes=("${tarIncludes[@]/#/"$targetPath"}")
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if [[ "$targetPath" == '/' ]]; then
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tarExcludes+=("$(realpath "${stage4Filename}")*")
#if $optSeperateKernel; then
# tarExcludes+=("$(realpath "${stage4Filename}.ksrc.${stage4Ext}")")
# tarExcludes+=("$(realpath "${stage4Filename}.kmod.${stage4Ext}")")
#fi
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if command -v portageq &>/dev/null; then
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portageRepos=$(portageq get_repos /)
for i in ${portageRepos}; do
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repoPath=$(portageq get_repo_path / "${i}")
tarExcludes+=("${repoPath}/*")
done
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tarExcludes+=("$(portageq distdir)/*")
tarExcludes+=("$(portageq pkgdir)/*")
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else
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tarExcludes+=("${tarExcludesPortage[@]/#/"/"}")
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fi
else
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tarExcludes+=("${tarExcludesPortage[@]/#/"$targetPath"}")
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fi
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if $optExcludeConfidential; then
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tarExcludes+=("${targetPath}home/*/.bash_history")
tarExcludes+=("${targetPath}root/.bash_history")
tarExcludes+=("${targetPath}var/lib/connman/*")
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fi
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if $optExcludeBoot; then
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tarExcludes+=("${targetPath}boot/*")
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fi
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if $optExcludeLost; then
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tarExcludes+=("lost+found")
fi
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tarExcludes+=("${optUserExclude[@]}")
tarIncludes+=("${optUserInclude[@]}")
# Compression options
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compressOptions=("${compressAvail[$optCompressType]}")
if [[ "${compressAvail[$optCompressType]}" == *"/xz" ]]; then
compressOptions+=("-T0")
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fi
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# Generic tar options:
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tarOptions=(
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"-cpP"
"--ignore-failed-read"
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"--xattrs-include=*.*"
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"--numeric-owner"
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"--checkpoint=.500"
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"--use-compress-prog=${compressOptions[*]}"
)
tarOptions+=("${tarArgs[@]}")
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# if not in optQuiet mode, this message will be displayed:
if ! $optQuiet; then
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echo "Are you sure that you want to make a stage 4 tarball of the system"
echo "located under the following directory?"
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echo "$targetPath"
echo
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echo "WARNING: since all data is saved by default the user should exclude all"
echo "security- or privacy-related files and directories, which are not"
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echo "already excluded by gen2stage4 options (such as -c), manually per cmdline."
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echo "example: \$ $(basename "$0") -s /my-backup --exclude=/etc/ssh/ssh_host*"
echo
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echo "COMMAND LINE PREVIEW:"
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#echo 'tar' "${tarOptions[@]}" "${tarIncludes[@]}" "${tarExcludes[@]}" -f "$stage4Filename" "${targetPath}"
echo 'tar' "${tarOptions[@]}" "${tarExcludes[@]/#/--exclude=}" -f "${stage4Filename}.${stage4Ext}" "${targetPath}" "${tarIncludes[@]}"
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#${excludes[@]/#/--exclude=
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if $optSeperateKernel; then
echo
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echo 'tar' "${tarOptions[@]}" -f "${stage4Filename}.ksrc.${stage4Ext}" "${targetPath}usr/src/linux-$(uname -r)"
echo 'tar' "${tarOptions[@]}" -f "${stage4Filename}.kmod.${stage4Ext}" "${targetPath}lib"*"/modules/$(uname -r)"
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fi
echo
echo -n 'Type "yes" to continue or anything else to quit: '
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read -r promptAgree
if [[ "${promptAgree,,}" == "yes" ]]; then
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optQuiet=true
fi
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fi
# start stage4 creation:
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if $optQuiet; then
#echo "Would've worked"
tar "${tarOptions[@]}" "${tarIncludes[@]}" "${tarExcludes[@]/#/--exclude=}" -f "${stage4Filename}.${stage4Ext}" "${targetPath}"
if [[ "$optSeperateKernel" ]]
then
tar "${tarOptions[@]}" -f "${stage4Filename}.ksrc.${stage4Ext}" "${targetPath}usr/src/linux-$(uname -r)"
tar "${tarOptions[@]}" -f "${stage4Filename}.kmod.${stage4Ext}" "${targetPath}lib"*"/modules/$(uname -r)"
fi
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fi