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osbuilder/dracut: Add missing libraries

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When the guest is built using dracut and the agent uses glibc (esp.
ppc64le/s390x), libraries might be missing. In my case, it was
`libutil.so`, but more can be added easily. Add a script to configure
`install_items` for dracut w.r.t. `ldd` of the agent.

Fixes: #2384
Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>
This commit is contained in:
Jakob Naucke 2021-08-04 13:50:42 +02:00
parent d473967120
commit b8133a188c
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GPG Key ID: 45FA1C7D310C0EBE
3 changed files with 58 additions and 0 deletions
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1
tools/osbuilder/.gitignore vendored
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@ -1,5 +1,6 @@
image-builder/nsdax
dracut/Dockerfile
dracut/dracut.conf.d/15-extra-libs.conf
/.*.done
/*_rootfs
/kata-Centos-dnf.conf

7
tools/osbuilder/Makefile
View File

@ -52,6 +52,12 @@ ifeq (dracut,$(BUILD_METHOD))
DRACUT_OPTIONS += --no-kernel
endif
ifeq (no,$(AGENT_INIT))
AGENT_PATH := $(DRACUT_OVERLAY_DIR)/usr/bin/kata-agent
else
AGENT_PATH := $(DRACUT_OVERLAY_DIR)/sbin/init
endif
ifeq (,$(DRACUT_OVERLAY_DIR))
$(error DRACUT_OVERLAY_DIR cannot be empty)
endif
@ -133,6 +139,7 @@ $(TARGET_INITRD): $(TARGET_ROOTFS_MARKER)
else
$(TARGET_INITRD): $(DRACUT_OVERLAY_DIR)
@echo Creating initrd image based on the host OS using dracut
$(DRACUT_DIR)/add_libs.sh $(AGENT_PATH) > $(DRACUT_CONF_DIR)/15-extra-libs.conf
dracut $(DRACUT_OPTIONS) --include $< / $@ $(DRACUT_KVERSION)
endif

50
tools/osbuilder/dracut/add_libs.sh Executable file
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@ -0,0 +1,50 @@
#!/bin/bash
#
# Copyright (c) 2021 IBM Corp.
#
# SPDX-License-Identifier: Apache-2.0
script_name="$(basename "$0")"
usage() {
cat >&2 << EOF
Usage: ${script_name} [-h] <agent-binary>
Output dracut configuration with required additional libraries for the Kata agent.
Example:
${script_name} \$GOPATH/src/github.com/kata-containers/kata-containers/src/agent/target/x86_64-unknown-linux-gnu/release/kata-agent
Options:
-h: Show this help
EOF
exit "$1"
}
if [[ $# != 1 || "$1" == "-h" ]]; then
usage 0
fi
agent_binary="$1"
non_standard_libs=("libutil.so")
install_items=""
if [ ! -x "${agent_binary}" ]; then
echo >&2 "ERROR: ${agent_binary} is not an executable file"
usage 1
fi
# Cover both cases of "not a dynamic executable" being printed to STDERR
# and "statically linked" being printed to STDOUT
linked_libs="$(ldd "${agent_binary}" 2>&1)"
if [ "$(wc -l <<< "${linked_libs}")" == 1 ]; then
echo >&2 "Agent appears to be linked statically, exiting"
exit 0
fi
for lib in "${non_standard_libs[@]}"; do
install_items+=" $(grep -F "${lib}" <<< "${linked_libs}" | cut -d" " -f3)"
done
cat << EOF
# add libraries that the Kata agent is linked against, but that are not included by default
install_items+="${install_items} "
EOF