scripts: Add uapi header import script
Add a script to automate importing Linux UAPI headers from kernel source.
The script handles dependency resolution and creates a commit with proper
attribution, similar to the ethtool project approach.
Usage:
$ LINUX_GIT="$LINUX_PATH" iproute2-import-uapi [commit]
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
diff --git a/scripts/iproute2-import-uapi b/scripts/iproute2-import-uapi
new file mode 100755
index 0000000..505ab25
--- /dev/null
+++ b/scripts/iproute2-import-uapi
@@ -0,0 +1,67 @@
+#!/bin/bash -e
+#
+# iproute2-import-uapi [commit]
+#
+# Imports sanitized copies of kernel uapi headers from <commit> (can be
+# a commit id, a tag or a branch name). If the argument is omitted,
+# commit currently checked out in the kernel repository is used.
+
+sn="${0##*/}"
+export ARCH="x86_64"
+mkopt="-j$(nproc)" || mkopt=''
+
+if [ ! -d "$LINUX_GIT" ]; then
+ echo "${sn}: please set LINUX_GIT to the location of kernel git" >&2
+ exit 1
+fi
+
+pushd "$LINUX_GIT"
+if [ -n "$1" ]; then
+ git checkout "$1"
+fi
+desc=$(git describe --exact-match 2>/dev/null \
+ || git show -s --abbrev=12 --pretty='%h: ("%s")')
+kobj=$(mktemp -d)
+make $mkopt O="$kobj" allmodconfig
+make $mkopt O="$kobj" prepare
+make $mkopt O="$kobj" INSTALL_HDR_PATH="${kobj}/hdr" headers_install
+popd
+
+pushd include/uapi
+find . -type f -name '*.h' -exec cp -v "${kobj}/hdr/include/{}" {} \;
+
+go_on=true
+while $go_on; do
+ go_on=false
+ while read f; do
+ if [ "${f#asm/}" != "$f" ]; then
+ # skip architecture dependent asm/ headers
+ continue
+ fi
+ if [ -f "$f" ]; then
+ # already present
+ continue
+ fi
+ if [ ! -f "${kobj}/hdr/include/${f}" ]; then
+ # not a kernel header
+ continue
+ fi
+ echo "+ add $f"
+ go_on=true
+ mkdir -p "${f%/*}"
+ cp "${kobj}/hdr/include/${f}" "${f}"
+ done < <(
+ find . -type f -name '*.[ch]' -exec sed -nre '\_^[[:blank:]]*#include[[:blank:]]<.+>_ { s_^[[:blank:]]*#include[[:blank:]]<([^>]*)>.*$_\1_ ; p }' {} \; \
+ | LC_ALL=C sort -u
+ )
+done
+popd
+rm -rf "$kobj"
+
+git add include/uapi
+git commit -s -F - <<EOT
+Update kernel headers
+
+Update kernel headers to commit:
+ ${desc}
+EOT
