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implement clean_chroot, #267

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implement clean_chroot, #267

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221a31b
implement clean_chroot,
adrelanos Dec 23, 2023
61db3a0
Merge branch 'master' into clean-chroot
adrelanos Feb 3, 2024
5f10d52
no longer hardcode path to /usr/sbin/chroot in clean_chroot function
adrelanos Apr 25, 2024
0b5fb7b
Merge remote-tracking branch 'adrelanos/clean-chroot' into clean-chroot
adrelanos Apr 25, 2024
45ad22d
no longer hardcode path to /usr/bin/env
adrelanos Jun 8, 2024
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8 changes: 8 additions & 0 deletions chroot-script
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,14 @@
# shellcheck disable=SC2317 # shellcheck has trouble understanding the code flow in this file

# error_handler {{{
error_handler() {
last_exit_code="$?"
last_bash_command="$BASH_COMMAND"
echo "Unexpected non-zero exit code $last_exit_code in ${BASH_SOURCE[*]} at line ${BASH_LINENO[*]} detected!
last bash command: $last_bash_command"
exit 1
}

set -e
set -E
set -o pipefail
Expand Down Expand Up @@ -260,7 +268,7 @@
debconf-set-selections < /etc/debootstrap/debconf-selections
}

if [ "$PACKAGES" = 'yes' ] ; then

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Possible misspelling: PACKAGES may not be assigned. Did you mean KPACKAGE? [SC2153](https://github.com/koalaman/shellcheck/wiki/SC2153)

Raw Output:
./chroot-script:271:9:info:Possible misspelling: PACKAGES may not be assigned. Did you mean KPACKAGE? [SC2153](https://github.com/koalaman/shellcheck/wiki/SC2153)
PACKAGES_FILE="/etc/debootstrap/packages"

if [ "$ARCH" = 'arm64' ]; then
Expand Down
98 changes: 66 additions & 32 deletions grml-debootstrap
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Expand Up @@ -32,7 +32,6 @@
set -E
set -o pipefail
trap "error_handler" ERR
export -f "error_handler"
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is removing the export of the error_handler from grml-debootstrap and addition of it to chroot script related to the environment cleanup, right?

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Ah, you mentioned this in a comment as I just noticed:

If we use env -i then we can no longer export shell functions. So export -f "error_handler" had to be removed.

We should squash all the relevant commits into one single commit and provide that useful information you collected into the commit message :)

Do you want me to give this a try or would you prefer to try on your own?

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Do you want me to give this a try

Yes, please.

# }}}

# variables {{{
Expand Down Expand Up @@ -81,11 +80,6 @@
[ -n "$VMSIZE" ] || VMSIZE="2G"
[ -n "$GRUB_INSTALL" ] || GRUB_INSTALL='yes'

# inside the chroot system locales might not be available, so use minimum:
export LANG=C
export LC_ALL=C
export LANGUAGE=C

# make sure interactive mode is only executed when
# using an empty configuration file or option --interactive
INTERACTIVE=''
Expand Down Expand Up @@ -298,16 +292,16 @@
# make sure nothing is left inside chroot so we can unmount it
for service in ssh mdadm ; do
if [ -x "${MNTPOINT}/etc/init.d/${service}" ] ; then
chroot "$MNTPOINT" "/etc/init.d/${service}" stop
clean_chroot "$MNTPOINT" "/etc/init.d/${service}" stop
fi
done

[ -x "$MNTPOINT"/bin/umount ] && chroot "$MNTPOINT" umount -a >/dev/null 2>&1 || true
[ -x "$MNTPOINT"/bin/umount ] && clean_chroot "$MNTPOINT" umount -a >/dev/null 2>&1 || true

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Note that A && B || C is not if-then-else. C may run when A is true. [SC2015](https://github.com/koalaman/shellcheck/wiki/SC2015)

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./grml-debootstrap:299:37:info:Note that A && B || C is not if-then-else. C may run when A is true. [SC2015](https://github.com/koalaman/shellcheck/wiki/SC2015)

# ugly, but make sure we really don't leave anything (/proc /proc and
# /dev /dev are intended, trying to work around timing issues, see #657023)
for ARG in /run/udev /sys /proc /proc /dev/pts /dev/pts /dev /dev ; do
[ -x "$MNTPOINT"/bin/umount ] && chroot "$MNTPOINT" umount $ARG >/dev/null 2>&1 || true
[ -x "$MNTPOINT"/bin/umount ] && clean_chroot "$MNTPOINT" umount $ARG >/dev/null 2>&1 || true

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Note that A && B || C is not if-then-else. C may run when A is true. [SC2015](https://github.com/koalaman/shellcheck/wiki/SC2015)

Raw Output:
./grml-debootstrap:304:39:info:Note that A && B || C is not if-then-else. C may run when A is true. [SC2015](https://github.com/koalaman/shellcheck/wiki/SC2015)
umount "$MNTPOINT"/$ARG >/dev/null 2>&1 || true
done

Expand Down Expand Up @@ -821,7 +815,7 @@
prompt_for_release()
{
[ -n "$RELEASE" ] && DEFAULT_RELEASE="$RELEASE" || DEFAULT_RELEASE='bullseye'
RELEASE="$(dialog --stdout --title "${PN}" --default-item $DEFAULT_RELEASE --menu \

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Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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./grml-debootstrap:818:61:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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Raw Output:
grml-debootstrap:818:-  RELEASE="$(dialog --stdout --title "${PN}" --default-item $DEFAULT_RELEASE --menu \
grml-debootstrap:818:+  RELEASE="$(dialog --stdout --title "${PN}" --default-item "$DEFAULT_RELEASE" --menu \
"Please enter the Debian release you would like to use for installation:" \
0 50 8 \
buster Debian/10 \
Expand Down Expand Up @@ -873,7 +867,7 @@
{
[ -n "$ISO" ] && DEFAULT_MIRROR='local' || DEFAULT_MIRROR='net'

CHOOSE_MIRROR=$(dialog --stdout --title "$PN" --default-item $DEFAULT_MIRROR \

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Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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./grml-debootstrap:870:64:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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Raw Output:
grml-debootstrap:870:-  CHOOSE_MIRROR=$(dialog --stdout --title "$PN" --default-item $DEFAULT_MIRROR \
grml-debootstrap:870:+  CHOOSE_MIRROR=$(dialog --stdout --title "$PN" --default-item "$DEFAULT_MIRROR" \
--menu "Where do you want to install from?" 0 0 0 \
net "install via network (downloading from mirror)" \
local "install from local directory/mirror"
Expand All @@ -883,13 +877,13 @@
[ -n "$MIRROR" ] || MIRROR='http://deb.debian.org/debian'
MIRROR="$(dialog --stdout --title "${PN}" --inputbox \
"Please enter Debian mirror you would like to use for installing packages." \
0 0 $MIRROR)" || bailout

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Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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./grml-debootstrap:880:20:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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Raw Output:
grml-debootstrap:880:-               0 0 $MIRROR)" || bailout
grml-debootstrap:880:+               0 0 "$MIRROR")" || bailout

else # CHOOSE_MIRROR == local
[ -n "$ISO" ] || ISO='/mnt/mirror'
ISO="$(dialog --stdout --title "${PN}" --inputbox \
"Please enter directory name you would like to use for installing packages." \
0 0 $ISO)" || bailout

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./grml-debootstrap:886:20:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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grml-debootstrap:886:-               0 0 $ISO)" || bailout
grml-debootstrap:886:+               0 0 "$ISO")" || bailout
fi
}
# }}}
Expand Down Expand Up @@ -1592,16 +1586,16 @@
if [ -n "$ARM_EFI_TARGET" ]; then
einfo "Installing Grub as bootloader into EFI."

chroot "${MNTPOINT}" grub-install --target=arm64-efi --efi-directory=/boot/efi --bootloader-id=debian --recheck --no-nvram --removable
clean_chroot "${MNTPOINT}" grub-install --target=arm64-efi --efi-directory=/boot/efi --bootloader-id=debian --recheck --no-nvram --removable
# Has chroot-script installed GRUB to MBR using grub-install (successfully), already?
# chroot-script skips installation for unset ${GRUB}
elif [[ -z "${GRUB}" ]] || ! dd if="${GRUB}" bs=512 count=1 2>/dev/null | cat -v | grep -Fq GRUB; then
einfo "Installing Grub as bootloader."

if ! chroot "${MNTPOINT}" dpkg --list grub-pc 2>/dev/null | grep -q '^ii' ; then
if ! clean_chroot "${MNTPOINT}" dpkg --list grub-pc 2>/dev/null | grep -q '^ii' ; then
echo "Notice: grub-pc package not present yet, installing it therefore."
# shellcheck disable=SC2086
DEBIAN_FRONTEND=$DEBIAN_FRONTEND chroot "$MNTPOINT" apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-pc
clean_chroot "$MNTPOINT" DEBIAN_FRONTEND=$DEBIAN_FRONTEND apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-pc
fi

mkdir -p "${MNTPOINT}/boot/grub"
Expand All @@ -1616,48 +1610,48 @@
mkdir -p "${MNTPOINT}"/boot/efi
mount -t vfat "${EFI_TARGET}" "${MNTPOINT}"/boot/efi

if ! chroot "${MNTPOINT}" dpkg --list shim-signed 2>/dev/null | grep -q '^ii' ; then
if ! clean_chroot "${MNTPOINT}" dpkg --list shim-signed 2>/dev/null | grep -q '^ii' ; then
echo "Notice: shim-signed package not present yet, installing it therefore."
# shellcheck disable=SC2086
DEBIAN_FRONTEND=$DEBIAN_FRONTEND chroot "$MNTPOINT" apt-get -y --no-install-recommends install $DPKG_OPTIONS shim-signed
clean_chroot "$MNTPOINT" DEBIAN_FRONTEND=$DEBIAN_FRONTEND apt-get -y --no-install-recommends install $DPKG_OPTIONS shim-signed
fi

if [ "$(dpkg --print-architecture)" = "arm64" ]; then
if ! chroot "${MNTPOINT}" dpkg --list grub-efi-arm64-signed 2>/dev/null | grep -q '^ii' ; then
if ! clean_chroot "${MNTPOINT}" dpkg --list grub-efi-arm64-signed 2>/dev/null | grep -q '^ii' ; then
echo "Notice: grub-efi-arm64-signed package not present yet, installing it therefore."
# shellcheck disable=SC2086
DEBIAN_FRONTEND=$DEBIAN_FRONTEND chroot "$MNTPOINT" apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-efi-arm64-bin grub-efi-arm64-signed
clean_chroot "$MNTPOINT" DEBIAN_FRONTEND=$DEBIAN_FRONTEND apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-efi-arm64-bin grub-efi-arm64-signed
fi
chroot "$MNTPOINT" grub-install --target=arm64-efi --efi-directory=/boot/efi --uefi-secure-boot --removable "/dev/$LOOP_DISK"
clean_chroot "$MNTPOINT" grub-install --target=arm64-efi --efi-directory=/boot/efi --uefi-secure-boot --removable "/dev/$LOOP_DISK"
elif [ "$(dpkg --print-architecture)" = "i386" ]; then
if ! chroot "${MNTPOINT}" dpkg --list grub-efi-ia32-signed 2>/dev/null | grep -q '^ii' ; then
if ! clean_chroot "${MNTPOINT}" dpkg --list grub-efi-ia32-signed 2>/dev/null | grep -q '^ii' ; then
echo "Notice: grub-efi-ia32-signed package not present yet, installing it therefore."
# shellcheck disable=SC2086
DEBIAN_FRONTEND=$DEBIAN_FRONTEND chroot "$MNTPOINT" apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-efi-ia32-bin grub-efi-ia32-signed
clean_chroot "$MNTPOINT" DEBIAN_FRONTEND=$DEBIAN_FRONTEND apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-efi-ia32-bin grub-efi-ia32-signed
fi
chroot "$MNTPOINT" grub-install --target=i386-efi --efi-directory=/boot/efi --uefi-secure-boot --removable "/dev/$LOOP_DISK"
chroot "$MNTPOINT" grub-install --target=i386-pc "/dev/$LOOP_DISK"
clean_chroot "$MNTPOINT" grub-install --target=i386-efi --efi-directory=/boot/efi --uefi-secure-boot --removable "/dev/$LOOP_DISK"
clean_chroot "$MNTPOINT" grub-install --target=i386-pc "/dev/$LOOP_DISK"
else
if ! chroot "${MNTPOINT}" dpkg --list grub-efi-amd64-signed 2>/dev/null | grep -q '^ii' ; then
if ! clean_chroot "${MNTPOINT}" dpkg --list grub-efi-amd64-signed 2>/dev/null | grep -q '^ii' ; then
echo "Notice: grub-efi-amd64-signed package not present yet, installing it therefore."
# shellcheck disable=SC2086
DEBIAN_FRONTEND=$DEBIAN_FRONTEND chroot "$MNTPOINT" apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-efi-amd64-bin grub-efi-amd64-signed
clean_chroot "$MNTPOINT" DEBIAN_FRONTEND=$DEBIAN_FRONTEND apt-get -y --no-install-recommends install $DPKG_OPTIONS grub-efi-amd64-bin grub-efi-amd64-signed
fi
chroot "$MNTPOINT" grub-install --target=x86_64-efi --efi-directory=/boot/efi --uefi-secure-boot --removable "/dev/$LOOP_DISK"
chroot "$MNTPOINT" grub-install --target=i386-pc "/dev/$LOOP_DISK"
clean_chroot "$MNTPOINT" grub-install --target=x86_64-efi --efi-directory=/boot/efi --uefi-secure-boot --removable "/dev/$LOOP_DISK"
clean_chroot "$MNTPOINT" grub-install --target=i386-pc "/dev/$LOOP_DISK"
fi
else
dd if="${MNTPOINT}/usr/lib/grub/i386-pc/boot.img" of="${ORIG_TARGET}" conv=notrunc bs=440 count=1
case "${_opt_filesystem}" in
f2fs)
chroot "${MNTPOINT}" grub-mkimage -O i386-pc -p "(hd0,msdos1)/boot/grub" -o /tmp/core.img biosdisk part_msdos f2fs
clean_chroot "${MNTPOINT}" grub-mkimage -O i386-pc -p "(hd0,msdos1)/boot/grub" -o /tmp/core.img biosdisk part_msdos f2fs
;;
xfs)
chroot "${MNTPOINT}" grub-mkimage -O i386-pc -p "(hd0,msdos1)/boot/grub" -o /tmp/core.img biosdisk part_msdos xfs
clean_chroot "${MNTPOINT}" grub-mkimage -O i386-pc -p "(hd0,msdos1)/boot/grub" -o /tmp/core.img biosdisk part_msdos xfs
;;
# NOTE - we might need to distinguish between further filesystems
*)
chroot "${MNTPOINT}" grub-mkimage -O i386-pc -p "(hd0,msdos1)/boot/grub" -o /tmp/core.img biosdisk part_msdos ext2
clean_chroot "${MNTPOINT}" grub-mkimage -O i386-pc -p "(hd0,msdos1)/boot/grub" -o /tmp/core.img biosdisk part_msdos ext2
;;
esac

Expand All @@ -1680,8 +1674,8 @@
fi

einfo "Updating grub configuration file."
chroot "${MNTPOINT}" update-grub
chroot "${MNTPOINT}" sync
clean_chroot "${MNTPOINT}" update-grub
clean_chroot "${MNTPOINT}" sync

case "$RELEASE" in
jessie)
Expand Down Expand Up @@ -1759,6 +1753,46 @@
}
# }}}

# clean_chroot {{{
clean_chroot() {
# inside the chroot system locales might not be available, so use minimum:
local -a env_vars=(
"LANG=C"
"LC_ALL=C"
"LANGUAGE=C"
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
)

# List of additional environment variables to include if set
local -a additional_vars=("http_proxy" "https_proxy" "ALL_PROXY")

# Loop through the additional environment variables and add them if set
for var in "${additional_vars[@]}"; do
if [[ -n "${!var}" ]]; then
env_vars+=("$var=${!var}")
fi
done

# Capture additional environment variables passed as arguments.
for var in "$@"; do
if [[ "$var" == *=* ]]; then
env_vars+=("$var")
else
break
fi
done

# First argument is the chroot directory.
local chroot_dir="$1"

# Remaining arguments are for the command to be executed in the chroot environment.
local chroot_command=("${@:2}")

# Run chroot, then env -i with the specified environment variables inside the chroot
chroot "$chroot_dir" /usr/bin/env -i "${env_vars[@]}" "${chroot_command[@]}"
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}
# }}}

# prepare chroot via chroot-script {{{
preparechroot() {
einfo "Preparing chroot system"
Expand Down Expand Up @@ -1816,12 +1850,12 @@
[ -n "$TUNE2FS" ] && echo "TUNE2FS='${TUNE2FS//\'/\'\\\'\'}'" >> "$CHROOT_VARIABLES"
[ -n "$VMSIZE" ] && echo "VMSIZE='${VMSIZE//\'/\'\\\'\'}'" >> "$CHROOT_VARIABLES"

cp $VERBOSE "${CONFFILES}"/chroot-script "${MNTPOINT}"/bin/chroot-script

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Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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./grml-debootstrap:1853:6:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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Raw Output:
grml-debootstrap:1853:-  cp $VERBOSE "${CONFFILES}"/chroot-script "${MNTPOINT}"/bin/chroot-script
grml-debootstrap:1853:+  cp "$VERBOSE" "${CONFFILES}"/chroot-script "${MNTPOINT}"/bin/chroot-script
chmod 755 "${MNTPOINT}"/bin/chroot-script
[ -d "$MNTPOINT"/etc/debootstrap/ ] || mkdir "$MNTPOINT"/etc/debootstrap/

# make sure we have our files for later use via chroot-script
cp $VERBOSE "${CONFFILES}/config" "${MNTPOINT}"/etc/debootstrap/

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Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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./grml-debootstrap:1858:6:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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Raw Output:
grml-debootstrap:1858:-  cp $VERBOSE "${CONFFILES}/config"           "${MNTPOINT}"/etc/debootstrap/
grml-debootstrap:1858:+  cp "$VERBOSE" "${CONFFILES}/config"           "${MNTPOINT}"/etc/debootstrap/
# make sure we adjust the configuration variables accordingly:
sed -i "s#RELEASE=.*#RELEASE=\"$RELEASE\"#" "${MNTPOINT}"/etc/debootstrap/config
sed -i "s#TARGET=.*#TARGET=\"$TARGET\"#" "${MNTPOINT}"/etc/debootstrap/config
Expand All @@ -1840,20 +1874,20 @@
PACKAGES_FILE="packages-arm64"
fi

cp $VERBOSE "${_opt_packages:-$CONFFILES/$PACKAGES_FILE}" \

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Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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./grml-debootstrap:1877:8:info:Double quote to prevent globbing and word splitting. [SC2086](https://github.com/koalaman/shellcheck/wiki/SC2086)

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grml-debootstrap:1877:-    cp $VERBOSE "${_opt_packages:-$CONFFILES/$PACKAGES_FILE}" \
grml-debootstrap:1877:+    cp "$VERBOSE" "${_opt_packages:-$CONFFILES/$PACKAGES_FILE}" \
"${MNTPOINT}/etc/debootstrap/${PACKAGES_FILE}"
fi

# debconf preseeding:
_opt_debconf=${_opt_debconf:-$CONFFILES/debconf-selections}
[ -f "${_opt_debconf}" ] && [ "$DEBCONF" = 'yes' ] && \
cp $VERBOSE "${_opt_debconf}" "${MNTPOINT}"/etc/debootstrap/debconf-selections

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grml-debootstrap:1884:-    cp $VERBOSE "${_opt_debconf}" "${MNTPOINT}"/etc/debootstrap/debconf-selections
grml-debootstrap:1884:+    cp "$VERBOSE" "${_opt_debconf}" "${MNTPOINT}"/etc/debootstrap/debconf-selections

# copy scripts that should be executed inside the chroot:
_opt_chroot_scripts=${_opt_chroot_scripts:-$CONFFILES/chroot-scripts/}
[ -d "$_opt_chroot_scripts" ] && [ "$CHROOT_SCRIPTS" = 'yes' ] && {
mkdir -p "${MNTPOINT}"/etc/debootstrap/chroot-scripts
cp -a $VERBOSE "${_opt_chroot_scripts}"/* "${MNTPOINT}"/etc/debootstrap/chroot-scripts/

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Raw Output:
grml-debootstrap:1890:-    cp -a $VERBOSE "${_opt_chroot_scripts}"/* "${MNTPOINT}"/etc/debootstrap/chroot-scripts/
grml-debootstrap:1890:+    cp -a "$VERBOSE" "${_opt_chroot_scripts}"/* "${MNTPOINT}"/etc/debootstrap/chroot-scripts/
}

# notice: do NOT use $CHROOT_VARIABLES inside chroot but statically file instead!
Expand Down Expand Up @@ -2052,9 +2086,9 @@
mount -t devtmpfs udev "${MNTPOINT}"/dev
mount -t devpts devpts "${MNTPOINT}"/dev/pts
if [ "$DEBUG" = "true" ] ; then
chroot "$MNTPOINT" /bin/bash -x /bin/chroot-script
clean_chroot "$MNTPOINT" /bin/bash -x /bin/chroot-script
else
chroot "$MNTPOINT" /bin/chroot-script
clean_chroot "$MNTPOINT" /bin/chroot-script
fi
try_umount 3 "$MNTPOINT"/dev/pts
try_umount 3 "$MNTPOINT"/dev
Expand Down
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