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kpatch-build: Allow setting kernel version if --sourcedir and --vmlinux are used 

Using -a/--archversion to explicitly set target kernel version was not
allowed if the kernel source directory and/or path to vmlinux with debug
info were set. This seems too strict, however.

vmlinux with debug info is used during the build to get symbol data, the
size of special structures, GCC version used to build the kernel, and the
target kernel version. As it turned out, some kernels, e.g. the ones from
OpenSUSE and derivatives, contain all that data except the Linux version
string in the file with debug info for vmlinux. Instead, that string is
present in vmlinux itself but that file does not contain debug info.

A simple workaround is to allow specifying the target kernel version
explicitly using -a/--archversion even if --sourcedir and/or --vmlinux are
set. If vmlinux with debug info does contain the Linux version string and
the version is different, kpatch-build will report an error.

Signed-off-by: Evgenii Shatokhin <evgenii.shatokhin@openvz.org>
This commit is contained in:
Evgenii Shatokhin 2022-04-04 13:16:24 +03:00
parent 75f220233b
commit fea0192104
1 changed files with 11 additions and 9 deletions
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20
kpatch-build/kpatch-build
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@ -638,10 +638,6 @@ if [[ $DEBUG -eq 1 ]] || [[ $DEBUG -ge 3 ]]; then
set -o xtrace
fi
if [[ -n "$ARCHVERSION" ]] && [[ -n "$VMLINUX" ]]; then
die "--archversion is incompatible with --vmlinux"
fi
if [[ -n "$SRCRPM" ]]; then
if [[ -n "$ARCHVERSION" ]]; then
warn "--archversion is incompatible with --sourcerpm"
@ -664,17 +660,23 @@ rm -rf "${TEMPDIR:?}"/*
rm -f "$LOGFILE"
if [[ -n "$USERSRCDIR" ]]; then
if [[ -n "$ARCHVERSION" ]]; then
warn "--archversion is incompatible with --sourcedir"
exit 1
fi
KERNEL_SRCDIR="$USERSRCDIR"
[[ -z "$VMLINUX" ]] && VMLINUX="$KERNEL_SRCDIR"/vmlinux
[[ ! -e "$VMLINUX" ]] && die "can't find vmlinux"
# Extract the target kernel version from vmlinux in this case.
ARCHVERSION="$(strings "$VMLINUX" | grep -m 1 -e "^Linux version" | awk '{ print($3); }')"
VMLINUX_VER="$(strings "$VMLINUX" | grep -m 1 -e "^Linux version" | awk '{ print($3); }')"
if [[ -n "$ARCHVERSION" ]]; then
if [[ -n "$VMLINUX_VER" ]] && [[ "$ARCHVERSION" != "$VMLINUX_VER" ]]; then
die "Kernel version mismatch: $ARCHVERSION was specified but vmlinux was built for $VMLINUX_VER"
fi
else
if [[ -z "$VMLINUX_VER" ]]; then
die "Unable to determine the kernel version from vmlinux"
fi
ARCHVERSION="$VMLINUX_VER"
fi
fi
if [[ -n "$OOT_MODULE" ]]; then