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fix(post-install): verify gzip before diverting or restoring it

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Only use a file as the real gzip if it is a working binary, otherwise
reinstall the gzip package; bail out without touching gzip if that
fails. Check the .distrib and wrapper writes, and never purge pigz
while gzip still depends on it.
This commit is contained in:
pbr
2026-10-01 19:38:06 +02:00
parent 4f651ffed5
commit 07f88659ea
2 changed files with 55 additions and 9 deletions
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scripts/post_install/customizable_post_install.sh
+33 -7
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@@ -1633,6 +1633,19 @@ disable_rpc() {
# True if $1 is a working gzip binary rather than the pigz wrapper script.
gzip_is_binary() {
[ -f "$1" ] && [ "$(head -c 2 "$1")" != "#!" ] && "$1" --version >/dev/null 2>&1
}
# Makes sure $1 is a working gzip, reinstalling the package if it isn't.
ensure_gzip_binary() {
gzip_is_binary "$1" && return 0
pmx_record_execution "Reinstall gzip" "apt-get install --reinstall -y gzip"
apt-get install --reinstall -y gzip >/dev/null 2>&1
gzip_is_binary "$1"
}
configure_pigz() {
local FUNC_VERSION="1.0"
pmx_journal_context "configure_pigz" "$FUNC_VERSION"
@@ -1685,16 +1698,23 @@ EOF
# Replace gzip with pigz wrapper. gzip is diverted so package updates
# land in gzip.distrib instead of overwriting the wrapper.
msg_info "$(translate "Replacing gzip with pigz wrapper...")"
local gz src
local gz src real
gz=$(dpkg -L gzip 2>/dev/null | grep -m1 -xE '(/usr)?/bin/gzip')
gz=${gz:-/usr/bin/gzip}
if [ -z "$(dpkg-divert --listpackage "$gz")" ]; then
# Older versions swapped gzip by hand and kept it as gzip.original.
# Use that as the real binary, unless a gzip update already put a
# newer one back.
# Prefer whichever is a real gzip; reinstall if neither is.
src="$gz"
[ -f /bin/gzip.original ] && [ "$(head -c 2 "$gz")" = "#!" ] && src=/bin/gzip.original
pmx_write_file "$gz.distrib" < "$src" && chmod 755 "$gz.distrib"
gzip_is_binary "$src" || src=/bin/gzip.original
if ! gzip_is_binary "$src"; then
ensure_gzip_binary "$gz" || { msg_error "$(translate "gzip could not be verified, leaving it unchanged")"; return 1; }
src="$gz"
fi
if ! pmx_write_file "$gz.distrib" < "$src" || ! chmod 755 "$gz.distrib" || ! gzip_is_binary "$gz.distrib"; then
rm -f "$gz.distrib"
msg_error "$(translate "gzip could not be verified, leaving it unchanged")"
return 1
fi
pmx_remove_file /bin/gzip.original
pmx_record_execution "Divert gzip" "dpkg-divert --local --no-rename --divert $gz.distrib --add $gz"
dpkg-divert --local --no-rename --divert "$gz.distrib" --add "$gz" >/dev/null
@@ -1706,8 +1726,14 @@ EOF
fi
# Left over from the bookworm diversion after upgrading to trixie.
[ "$gz" = /usr/bin/gzip ] && [ -n "$(dpkg-divert --listpackage /bin/gzip)" ] && dpkg-divert --local --no-rename --remove /bin/gzip >/dev/null
if ! cmp -s "$gz" /bin/pigzwrapper; then
pmx_write_file "$gz" < /bin/pigzwrapper
# Never put the wrapper in place without a real gzip behind it. With the
# diversion active, a reinstall writes straight into gzip.distrib.
real=$(dpkg-divert --truename "$gz")
ensure_gzip_binary "$real" || { msg_error "$(translate "gzip could not be verified, leaving it unchanged")"; return 1; }
if ! cmp -s "$gz" /bin/pigzwrapper && ! pmx_write_file "$gz" < /bin/pigzwrapper; then
pmx_write_file "$gz" < "$real"
msg_error "$(translate "gzip could not be verified, leaving it unchanged")"
return 1
fi
msg_ok "$(translate "gzip replaced with pigz wrapper successfully")"