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easy way to use squashfs pseudofile: allows to override mode uid gid of files in the SRM

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When using a non-root user to execute sysrescue-customize with the srm building function,
you won't have the rights to create files owned by root. When you want to keep the build_into_srm
dir in a git tree, you won't be able to store the file mode there. But using a specific file
mode is important for example for /root/.ssh

The mksquashfs pseudo file allows to solve this by overriding individual file modes like this:

cat <<EOF >recipe_dir/build_into_srm/.squashfs-pseudo
/root/.ssh m 700 root root
/root/.ssh/authorized_keys m 600 root root
EOF
This commit is contained in:
Gerd v. Egidy 2022-01-10 22:47:21 +01:00
parent 5c7608d7e4
commit 048c1724bf
1 changed files with 15 additions and 3 deletions
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18
airootfs/usr/share/sysrescue/bin/sysrescue-customize
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@ -506,16 +506,28 @@ create_srm()
fi fi
local squashfs_options="" local squashfs_options=""
local squashfs_exclude=""
# did the user specify a "pseudo-file"? a list with mode, uid, gid etc. overrides for files
if [[ -f "${SRM_DIR}/.squashfs-pseudo" ]]; then
squashfs_options+=" -pf \"${SRM_DIR}/.squashfs-pseudo\" "
# exclude the pseudeo file from the filesystem
squashfs_exclude+=" -e .squashfs-pseudo"
fi
# load options for the mksquashfs call from options file # load options for the mksquashfs call from options file
if [[ -f "${SRM_DIR}/.squashfs-options" ]]; then if [[ -f "${SRM_DIR}/.squashfs-options" ]]; then
# strip comment lines, replace newlines with spaces to allow using multiple lines easily # strip comment lines, replace newlines with spaces to allow using multiple lines easily
squashfs_options=$(cat "${SRM_DIR}/.squashfs-options" | grep -v "^#" | tr '\n' ' ') squashfs_options+=$(cat "${SRM_DIR}/.squashfs-options" | grep -v "^#" | tr '\n' ' ')
# exclude the options file from the filesystem # exclude the options file from the filesystem
# excludes must come after other options, so add it after the content of the options file squashfs_exclude+=" -e .squashfs-options"
squashfs_options+=" -e .squashfs-options"
fi fi
# excludes must come after all other options
squashfs_options+="$squashfs_exclude"
# prepare the directory options to be correctly quoted for eval # prepare the directory options to be correctly quoted for eval
local dir_options="\"${SRM_DIR}\" \"${DEST_SRM}\"" local dir_options="\"${SRM_DIR}\" \"${DEST_SRM}\""