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have new mount points be owned by their parent's owner

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Niklas Gollenstede 2023-07-31 02:47:24 +02:00
parent 6a886a839d
commit c59ecbba02
2 changed files with 23 additions and 6 deletions
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9
lib/setup-scripts/disk.sh
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@ -215,7 +215,6 @@ function fix-grub-install {
fi
}
## Mounts all file systems as it would happen during boot, but at path prefix »$mnt« (instead of »/«).
function mount-system {( # 1: mnt, 2?: fstabPath, 3?: allowFail
# While not generally required for fstab, nixos uses the dependency-sorted »config.system.build.fileSystems« list (instead of plain »builtins.attrValues config.fileSystems«) to generate »/etc/fstab« (provided »config.fileSystems.*.depends« is set correctly, e.g. for overlay mounts).
@ -230,19 +229,19 @@ function mount-system {( # 1: mnt, 2?: fstabPath, 3?: allowFail
options=,$options, ; options=${options//,ro,/,}
if ! @{native.util-linux}/bin/mountpoint -q "$mnt"/"$target" ; then (
mkdir -p "$mnt"/"$target" || exit
mkdir-sticky "$mnt"/"$target" || exit
[[ $type == tmpfs || $type == auto || $type == */* ]] || @{native.kmod}/bin/modprobe --quiet $type || true # (this does help sometimes)
if [[ $type == overlay ]] ; then
options=${options//,workdir=/,workdir=$mnt\/} ; options=${options//,upperdir=/,upperdir=$mnt\/} # Work and upper dirs must be in target.
workdir=$( <<<"$options" grep -o -P ',workdir=\K[^,]+' || true ) ; if [[ $workdir ]] ; then mkdir -p "$workdir" ; fi
upperdir=$( <<<"$options" grep -o -P ',upperdir=\K[^,]+' || true ) ; if [[ $upperdir ]] ; then mkdir -p "$upperdir" ; fi
workdir=$( <<<"$options" grep -o -P ',workdir=\K[^,]+' || true ) ; if [[ $workdir ]] ; then mkdir-sticky "$workdir" ; fi
upperdir=$( <<<"$options" grep -o -P ',upperdir=\K[^,]+' || true ) ; if [[ $upperdir ]] ; then mkdir-sticky "$upperdir" ; fi
lowerdir=$( <<<"$options" grep -o -P ',lowerdir=\K[^,]+' || true )
options=${options//,lowerdir=$lowerdir,/,lowerdir=$mnt/${lowerdir//:/:$mnt\/},} ; source=overlay
# TODO: test the lowerdir stuff
elif [[ $options =~ ,r?bind, ]] ; then
if [[ $source == /nix/store/* ]] ; then options=,ro$options ; fi
source=$mnt/$source ; if [[ ! -e $source ]] ; then mkdir -p "$source" || exit ; fi
source=$mnt/$source ; if [[ ! -e $source ]] ; then mkdir-sticky "$source" || exit ; fi
fi
@{native.util-linux}/bin/mount -t $type -o "${options:1:(-1)}" "$source" "$mnt"/"$target" || exit

20
lib/setup-scripts/utils.sh
View File

@ -74,6 +74,24 @@ function copy-function { # 1: existingName, 2: newName
eval "${original/$1/${2?newName not provided}}" # run the code declaring the function again, replacing only the first occurrence of the name
}
## Ensures that a directory exists, like »mkdir -p«, but for any new path elements created, copies the user/group/mode of the closest existing parent.
# Only uses the fallback user/group/mode when the closest existing parent is already a sticky dir (whose (root-)ownership does not mean much, as it is meant for children owned by any/other user(s), like /tmp).
function mkdir-sticky { # 1: path, 2?: fallbackOwner, 3?: fallbackGroup, 4?: fallbackMode
local path ; path=$1 ; shift
if [[ -d $path ]] ; then return ; fi # existing (symlink to existing) dir
if [[ -L $path || -e $path ]] ; then echo "Can't create (child of) existing file (or broken symlink) '$path'" 1>&2 ; return 1 ; fi
local parent ; parent=$( dirname "$path" ) || return
mkdir-sticky "$parent" "$@" || return
parent=$( realpath "$parent" ) || return
stat=( $( stat --format '%u %g %a' "$parent" ) ) || return
if [[ ${stat[2]} =~ ^1...$ ]] ; then # sticky parent
#echo "Can't infer correct ownership/permissions for child '$( basename "$path" )' of sticky dir '$parent'" 1>&2 ; return 1
install --directory --owner="${1:-0}" --group="${2:-0}" ${3+--mode="$3"} "$path" || return
else
install --directory --owner=${stat[0]} --group=${stat[1]} --mode=${stat[2]} "$path" || return
fi
}
## Writes a »$name«d secret from stdin to »$targetDir«, ensuring proper file permissions.
function write-secret {( set -u # 1: path, 2?: owner[:[group]], 3?: mode
mkdir -p -- "$(dirname "$1")"/ || exit
@ -136,7 +154,7 @@ function build-lazy { # 1: drvPath, 2?: output
}
## Tests whether (returns 0/success if) the first version argument is greater/less than (or equal) the second version argument.
function version-gr-eq { printf '%s\n%s' "$1" "$2" | sort -C -V -r; }
function version-gr-eq { printf '%s\n%s' "$1" "$2" | sort -C -V -r ; }
function version-lt-eq { printf '%s\n%s' "$1" "$2" | sort -C -V ; }
function version-gt { ! version-gt-eq "$2" "$1" ; }
function version-lt { ! version-lt-eq "$2" "$1" ; }