mirror of
https://github.com/nchevsky/systemrescue-zfs.git
synced 2025-12-06 07:12:01 +01:00
Use sub-command in cowpacman2srm to specify whether to do prepare or create
This commit is contained in:
fdupoux
parent
180176da7f
commit
c2392e7516
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@ -2,7 +2,7 @@
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#
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# cowpacman2srm - Create SystemRescueModules (SRM) from pacman packages installed into the COW space
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#
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# Author: Gerd v. Egidy
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# Authors: Gerd v. Egidy and Francois Dupoux
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# SPDX-License-Identifier: GPL-3.0-or-later
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#
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# This script is meant to help creating SystemRescueModules (SRM) for SystemRescue.
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@ -10,14 +10,25 @@
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# https://www.system-rescue.org/Modules/
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#
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# To use first install all packages you want to have in your SRM with pacman.
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# Default COW (Copy-On-Write) space is a ramdisk, so you usually don't have to do anything
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# Default COW (Copy-On-Write) space is a ramdisk, so you usually don't have to do anything
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# special except provide enough RAM.
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# You can also enable any systemd services that are in these packages.
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#
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# Then call:
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# cowpacman2srm [-c compalg] [-l complevel] [-p] [targetfile.srm]
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# cowpacman2srm [-s subcmd] [-c compalg] [-l complevel] [targetfile.srm]
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#
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# Copy the .srm file to archisobasedir (default: "sysresccd") on your boot disk
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# This script runs in two stages:
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# 1) During the "prepare" stage all files belonging to pacman packages manually installed
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# are being copied to a temporary directory
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# 2) During the "create" stage the SRM file (which is a squash file system) is being created
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# with the contents stored in the temporary directory
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# You can either run both stages in a single run (this is the default) or one stage at a time.
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# If you do not specify any sub-command the script is going to run the two stages in one run.
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# If you want to customize the contents of the SRM module you can run the "prepare" stage first,
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# then make customizations in the temporary directory (for example to add extra files) and then
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# you run the "create" stage to produce the SRM file.
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#
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# Copy the .srm file to archisobasedir (default: "sysresccd") on your boot disk
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# and add the "loadsrm" boot parameter to SystemRescue.
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#
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# There is no mechanism to check if a SRM is compatible with the version of SystemRescue
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@ -32,165 +43,127 @@ PKG_FILELIST=${TMP_TARGET}filelist
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# default options
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COMPRESS=zstd
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COMPLEVEL=""
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PREPARE_MODE=0
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SUBCMD="all"
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OPER_PREPARE=0
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OPER_CREATE=0
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function usage()
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{
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echo
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echo "Usage: cowpacman2srm [-c compalg] [-l complevel] [-p] [targetfile.srm]"
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echo "Usage: cowpacman2srm [-s subcmd] [-c compalg] [-l complevel] [targetfile.srm]"
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echo
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echo "compalg is any of the compression algorithms supported by mksquashfs (default: zstd)"
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echo
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echo "complevel is the compression level for the given algorithm (if supported with -Xcompression-level)"
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echo
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echo "-p: prepare mode. Only prepares a directory with all files that would go into the SRM,"
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echo " but does not run mksquashfs. This allows further modifications by the user."
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echo " In prepare mode the target file parameter is ignored."
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echo "options:"
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echo "- subcmd is a sub-command to execute, it can be any of: prepare, create, all. (default: all)"
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echo "- compalg is any of the compression algorithms supported by mksquashfs (default: zstd)"
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echo "- complevel is the compression level for the given algorithm (if supported with -Xcompression-level)"
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echo
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exit 1
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}
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while getopts "c:l:p" opt; do
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case "${opt}" in
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c)
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COMPRESS="${OPTARG}"
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;;
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l)
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COMPLEVEL="-Xcompression-level ${OPTARG}"
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;;
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p)
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PREPARE_MODE=1
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;;
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*)
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usage
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;;
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esac
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done
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function prepare()
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{
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# determine the COW target upperdir, read it out from the mount options of /
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UPPERDIR=$(findmnt --mountpoint / --noheadings --output FS-OPTIONS | sed -e "s/.*upperdir=\([^,]*\),*.*/\1/")
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shift $((OPTIND-1))
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TARGETFILE="$1"
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if [ -z "$TARGETFILE" ] && [ "$PREPARE_MODE" -eq 0 ]; then
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echo "ERROR: no target file specified"
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usage
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fi
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if [ -e "$TARGETFILE" ] && [ "$PREPARE_MODE" -eq 0 ]; then
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echo "ERROR: target file already existing. Please delete."
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exit 1
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fi
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if [ -e "$TMP_TARGET" ]; then
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echo "ERROR: temporary directory $TMP_TARGET already existing. Please delete."
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exit 1
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fi
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# determine the COW target upperdir, read it out from the mount options of /
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UPPERDIR=$(findmnt --mountpoint / --noheadings --output FS-OPTIONS | sed -e "s/.*upperdir=\([^,]*\),*.*/\1/")
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if [ -z "$UPPERDIR" ] || ! [ -d "$UPPERDIR" ]; then
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echo "ERROR: can't determine upperdir"
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exit 2
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fi
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if ! [ -d "${UPPERDIR}/var/lib/pacman/local/" ]; then
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echo "ERROR: no packages installed in the COW space"
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echo "(${UPPERDIR}/var/lib/pacman/local/ not existing)"
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exit 3
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fi
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# read the names of the packages in the COW space
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# package names are in the desc file in the line after the marker %NAME%
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PACKAGENAMES=$(find ${UPPERDIR}/var/lib/pacman/local/ -name desc -exec grep -A1 --no-filename "%NAME%" \{\} \; | grep -v -E "(--|%NAME%)")
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if [ -z "$PACKAGENAMES" ]; then
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echo "ERROR: no packages installed in the COW space"
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echo "(${UPPERDIR}/var/lib/pacman/local/ empty)"
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exit 3
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fi
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# create temp dir used to store the package list and later the files to put into the SRM
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mkdir -p $TMP_TARGET
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# read all filenames installed by the packages in COW space
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# sort to make sure dir names come before files in the dir
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pacman -Q --list --quiet $PACKAGENAMES | sort -u >$PKG_FILELIST
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if cat $PKG_FILELIST | wc -l | grep -q "^0$"; then
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echo "ERROR: empty file list for the installed packages"
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# clean up
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rm -rf ${TMP_TARGET}
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exit 3
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fi
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echo -n "Found Packages: "
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echo "$PACKAGENAMES" | wc -w
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echo -n "Found Files: "
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cat $PKG_FILELIST | wc -l
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echo
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echo "Copying to temp dir..."
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# newline separator for for loops, necessary for filenames with spaces in them
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IFS_SAVE=$IFS
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IFS=$'\n'
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# iterate over all files and dirs installed by the packages
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for FILE in `cat $PKG_FILELIST`; do
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if [ -d "${FILE}" ] && ! [ -L "${FILE}" ]; then
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# we have a real dir (not a symlink to a dir)
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# create it below $TMP_TARGET, copy attributes
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mkdir -p "${TMP_TARGET}${FILE}"
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chmod "--reference=${FILE}" "${TMP_TARGET}${FILE}"
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chown "--reference=${FILE}" "${TMP_TARGET}${FILE}"
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else
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# we have a file or symlink, copy it, preserving symlinks as such
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cp "--target-directory=${TMP_TARGET}" --preserve=all --parents --no-dereference "${FILE}"
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if [ -z "$UPPERDIR" ] || ! [ -d "$UPPERDIR" ]; then
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echo "ERROR: can't determine upperdir"
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exit 2
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fi
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done
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# copy the pacman package database too
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# first create the directories in the tmp space
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for DIR in `find ${UPPERDIR}/var/lib/pacman/local/ -type d -printf "%P\n"`; do
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mkdir -p "${TMP_TARGET}var/lib/pacman/local/${DIR}"
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done
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# then copy all package database files
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for FILE in `find ${UPPERDIR}/var/lib/pacman/local/ -type f -printf "%P\n"`; do
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cp --no-dereference "${UPPERDIR}/var/lib/pacman/local/${FILE}" "${TMP_TARGET}var/lib/pacman/local/${FILE}"
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done
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# the user may have enabled systemd units provided by the packages in COW space
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# we want to copy these too
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# read all systemd symlinks in the cow-dir
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for SYMLINK in `find "${UPPERDIR}/etc/systemd/system/" -type l -printf "%P\n"`; do
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TARGET=$(readlink "${UPPERDIR}/etc/systemd/system/${SYMLINK}")
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# targets the symlink something that is in our packages?
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if grep -q "${TARGET}" $PKG_FILELIST; then
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echo "Copying systemd link /etc/systemd/system/${SYMLINK}"
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# copy the symlink to our target dir
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LINKDIR=$(dirname "${TMP_TARGET}/etc/systemd/system/${SYMLINK}")
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mkdir -p "${LINKDIR}"
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cp --no-dereference "${UPPERDIR}/etc/systemd/system/${SYMLINK}" "${TMP_TARGET}/etc/systemd/system/${SYMLINK}"
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if ! [ -d "${UPPERDIR}/var/lib/pacman/local/" ]; then
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echo "ERROR: no packages installed in the COW space"
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echo "(${UPPERDIR}/var/lib/pacman/local/ not existing)"
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exit 3
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fi
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done
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# restore line separator
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IFS=$IFS_SAVE
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# read the names of the packages in the COW space
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# package names are in the desc file in the line after the marker %NAME%
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PACKAGENAMES=$(find ${UPPERDIR}/var/lib/pacman/local/ -name desc -exec grep -A1 --no-filename "%NAME%" \{\} \; | grep -v -E "(--|%NAME%)")
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rm -f $PKG_FILELIST
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if [ -z "$PACKAGENAMES" ]; then
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echo "ERROR: no packages installed in the COW space"
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echo "(${UPPERDIR}/var/lib/pacman/local/ empty)"
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exit 3
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fi
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if [ "$PREPARE_MODE" -eq 1 ]; then
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# create temp dir used to store the package list and later the files to put into the SRM
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mkdir -p $TMP_TARGET
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# read all filenames installed by the packages in COW space
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# sort to make sure dir names come before files in the dir
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pacman -Q --list --quiet $PACKAGENAMES | sort -u >$PKG_FILELIST
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if cat $PKG_FILELIST | wc -l | grep -q "^0$"; then
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echo "ERROR: empty file list for the installed packages"
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# clean up
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rm -rf ${TMP_TARGET}
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exit 3
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fi
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echo -n "Found Packages: "
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echo "$PACKAGENAMES" | wc -w
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echo -n "Found Files: "
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cat $PKG_FILELIST | wc -l
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echo
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echo "SRM content prepared in ${TMP_TARGET}"
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echo
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echo "Do any wanted modifications and then run:"
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echo "mksquashfs ${TMP_TARGET} targetfile.srm -info -comp $COMPRESS $COMPLEVEL"
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else
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echo "Copying to temp dir..."
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# newline separator for for loops, necessary for filenames with spaces in them
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IFS_SAVE=$IFS
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IFS=$'\n'
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# iterate over all files and dirs installed by the packages
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for FILE in `cat $PKG_FILELIST`; do
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if [ -d "${FILE}" ] && ! [ -L "${FILE}" ]; then
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# we have a real dir (not a symlink to a dir)
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# create it below $TMP_TARGET, copy attributes
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mkdir -p "${TMP_TARGET}${FILE}"
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chmod "--reference=${FILE}" "${TMP_TARGET}${FILE}"
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chown "--reference=${FILE}" "${TMP_TARGET}${FILE}"
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else
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# we have a file or symlink, copy it, preserving symlinks as such
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cp "--target-directory=${TMP_TARGET}" --preserve=all --parents --no-dereference "${FILE}"
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fi
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done
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# copy the pacman package database too
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# first create the directories in the tmp space
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for DIR in `find ${UPPERDIR}/var/lib/pacman/local/ -type d -printf "%P\n"`; do
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mkdir -p "${TMP_TARGET}var/lib/pacman/local/${DIR}"
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done
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# then copy all package database files
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for FILE in `find ${UPPERDIR}/var/lib/pacman/local/ -type f -printf "%P\n"`; do
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cp --no-dereference "${UPPERDIR}/var/lib/pacman/local/${FILE}" "${TMP_TARGET}var/lib/pacman/local/${FILE}"
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done
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# the user may have enabled systemd units provided by the packages in COW space
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# we want to copy these too
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# read all systemd symlinks in the cow-dir
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for SYMLINK in `find "${UPPERDIR}/etc/systemd/system/" -type l -printf "%P\n"`; do
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TARGET=$(readlink "${UPPERDIR}/etc/systemd/system/${SYMLINK}")
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# targets the symlink something that is in our packages?
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if grep -q "${TARGET}" $PKG_FILELIST; then
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echo "Copying systemd link /etc/systemd/system/${SYMLINK}"
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# copy the symlink to our target dir
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LINKDIR=$(dirname "${TMP_TARGET}/etc/systemd/system/${SYMLINK}")
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mkdir -p "${LINKDIR}"
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cp --no-dereference "${UPPERDIR}/etc/systemd/system/${SYMLINK}" "${TMP_TARGET}/etc/systemd/system/${SYMLINK}"
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fi
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done
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# restore line separator
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IFS=$IFS_SAVE
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rm -f $PKG_FILELIST
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}
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function create()
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{
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echo
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echo "Creating squashfs..."
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@ -198,4 +171,69 @@ else
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# clean up
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rm -rf ${TMP_TARGET}
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}
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while getopts "s:c:l:" opt; do
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case "${opt}" in
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s)
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SUBCMD="${OPTARG}"
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;;
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c)
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COMPRESS="${OPTARG}"
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;;
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l)
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COMPLEVEL="-Xcompression-level ${OPTARG}"
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;;
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*)
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usage
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;;
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esac
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done
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case "${SUBCMD}" in
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prepare)
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OPER_PREPARE=1
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;;
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create)
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OPER_CREATE=1
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;;
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all)
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OPER_PREPARE=1
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OPER_CREATE=1
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;;
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*)
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echo "ERROR: invalid sub-command: '${SUBCMD}'"
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usage
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;;
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esac
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shift $((OPTIND-1))
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TARGETFILE="$1"
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if [ "$OPER_CREATE" -eq 1 ] && [ -z "$TARGETFILE" ]; then
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echo "ERROR: no target file specified"
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usage
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fi
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if [ "$OPER_CREATE" -eq 1 ] && [ -e "$TARGETFILE" ]; then
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echo "ERROR: target file already exists. Please delete it."
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exit 1
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fi
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if [ "$OPER_PREPARE" -eq 1 ] && [ -e "$TMP_TARGET" ]; then
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echo "ERROR: temporary directory $TMP_TARGET already exists. Please delete it."
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exit 1
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fi
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if [ "$OPER_PREPARE" -eq 0 ] && [ ! -d "$TMP_TARGET" ]; then
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echo "ERROR: temporary directory $TMP_TARGET does not exist. Please make sure you run the 'prepare' sub-command before 'create'."
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exit 1
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fi
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if [ "$OPER_PREPARE" -eq 1 ]; then
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prepare
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fi
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if [ "$OPER_CREATE" -eq 1 ]; then
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create
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fi
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