hooks/merged-usr: implement post-merging as debootstrap does (see #1049898)
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4d76d04cfe
commit
8d91ca7b24
GPG Key ID:
F2CBA5C78FBD83E1
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#!/bin/sh
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set -eu
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env --chdir="$1" APT_CONFIG="$MMDEBSTRAP_APT_CONFIG" apt-get update --error-on=any
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# if the usr-is-merged package cannot be installed with apt, do nothing
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if ! env --chdir="$1" APT_CONFIG="$MMDEBSTRAP_APT_CONFIG" apt-cache show --no-all-versions usr-is-merged > /dev/null 2>&1; then
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echo "no package called usr-is-merged found -- not running merged-usr extract hook" >&2
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exit 0
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else
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echo "package usr-is-merged found -- running merged-usr extract hook" >&2
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fi
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# resolve the script path using several methods in order:
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# 1. using dirname -- "$0"
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# 2. using ./hooks
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# 3. using /usr/share/mmdebstrap/hooks/
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for p in "$(dirname -- "$0")/.." ./hooks /usr/share/mmdebstrap/hooks; do
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if [ -x "$p/merged-usr/setup00.sh" ] && [ -x "$p/merged-usr/extract00.sh" ] && [ -x "$p/merged-usr/essential00.sh" ]; then
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"$p/merged-usr/extract00.sh" "$1"
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exit 0
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fi
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done
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echo "cannot find merged-usr hook anywhere" >&2
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exit 1
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#!/bin/sh
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set -eu
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if [ "${MMDEBSTRAP_VERBOSITY:-1}" -ge 3 ]; then
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set -x
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fi
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TARGET="$1"
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# can_usrmerge_symlink() and can_usrmerge_symlink() are
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# Copyright 2023 Helmut Grohne <helmut@subdivi.de>
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# and part of the debootstrap source in /usr/share/debootstrap/functions
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# https://salsa.debian.org/installer-team/debootstrap/-/merge_requests/96
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# https://bugs.debian.org/104989
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can_usrmerge_symlink() {
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# Absolute symlinks can be relocated without problems.
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test "${2#/}" = "$2" || return 0
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while :; do
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if test "${2#/}" != "$2"; then
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# Handle double-slashes.
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set -- "$1" "${2#/}"
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elif test "${2#./}" != "$2"; then
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# Handle ./ inside a link target.
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set -- "$1" "${2#./}"
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elif test "$2" = ..; then
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# A parent directory symlink is ok if it does not
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# cross the top level directory.
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test "${1%/*/*}" != "$1" -a -n "${1%/*/*}"
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return $?
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elif test "${2#../}" != "$2"; then
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# Symbolic link crossing / cannot be moved safely.
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# This is prohibited by Debian Policy 10.5.
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test "${1%/*/*}" = "$1" -o -z "${1%/*/*}" && return 1
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set -- "${1%/*}" "${2#../}"
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else
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# Consider the symlink ok if its target does not
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# contain a parent directory. When we fail here,
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# the link target is non-minimal and doesn't happen
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# in the archive.
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test "${2#*/../}" = "$2"
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return $?
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fi
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done
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}
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merge_usr_entry() {
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# shellcheck disable=SC3043
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local entry canon
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canon="$TARGET/usr/${1#"$TARGET/"}"
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test -h "$canon" &&
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error 1 USRMERGEFAIL "cannot move %s as its destination exists as a symlink" "${1#"$TARGET"}"
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if ! test -e "$canon"; then
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mv "$1" "$canon"
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return 0
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fi
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test -d "$1" ||
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error 1 USRMERGEFAIL "cannot move non-directory %s as its destination exists" "${1#"$TARGET"}"
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test -d "$canon" ||
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error 1 USRMERGEFAIL "cannot move directory %s as its destination is not a directory" "${1#"$TARGET"}"
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for entry in "$1/"* "$1/."*; do
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# Some shells return . and .. on dot globs.
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test "${entry%/.}" != "${entry%/..}" && continue
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if test -h "$entry" && ! can_usrmerge_symlink "${entry#"$TARGET"}" "$(readlink "$entry")"; then
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error 1 USRMERGEFAIL "cannot move relative symlink crossing top-level directory" "${entry#"$TARGET"}"
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fi
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# Ignore glob match failures
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if test "${entry%'/*'}" != "${entry%'/.*'}" && ! test -e "$entry"; then
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continue
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fi
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merge_usr_entry "$entry"
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done
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rmdir "$1"
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}
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# This is list includes all possible multilib directories. It must be
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# updated when new multilib directories are being added. Hopefully,
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# all new architectures use multiarch instead, so we never get to
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# update this.
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for dir in bin lib lib32 lib64 libo32 libx32 sbin; do
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test -h "$TARGET/$dir" && continue
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test -e "$TARGET/$dir" || continue
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merge_usr_entry "$TARGET/$dir"
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ln -s "usr/$dir" "$TARGET/$dir"
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done
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