docker: find RPM provides from symvers directly

Using the RPM macros to generate the symbols provided by the currently running
kernel takes a lot of time: every module is manually unpacked, read and
processed. However, the same information is already available in the
"/lib/modules/*/symvers*" file. We just have to parse it to generate
output compatible with the existing infrastructure.

In a quick test, this reduces the load time for the DRBD module from minutes
to one second.

docker/Dockerfile.rhel7

@@ -21,7 +21,6 @@ RUN yum -y update-minimal --security --sec-severity=Important --sec-severity=Cri
 		make \
 		patch \
 		perl \
-		redhat-rpm-config \
 		yum-utils \
 	&& \
 	yum clean all -y && \

docker/Dockerfile.rhel8

@@ -3,7 +3,7 @@ FROM $EXTRAPKGS as extrapkgs
 # by checking for /pkgs we can cache that step
 # and prepare images that already contain the packages.
 RUN mkdir /pkgs
-RUN dnf install -y 'dnf-command(download)' && cd /pkgs && dnf download elfutils-libelf-devel kernel-rpm-macros && rm -f *.i686.rpm # !lbbuild
+RUN dnf install -y 'dnf-command(download)' && cd /pkgs && dnf download elfutils-libelf-devel && rm -f *.i686.rpm # !lbbuild
 
 FROM registry.access.redhat.com/ubi8/ubi
 MAINTAINER Roland Kammerer <[email protected]>
@@ -39,7 +39,7 @@ RUN yum -y update-minimal --security --sec-severity=Important --sec-severity=Cri
 COPY --from=extrapkgs /pkgs /pkgs
 RUN yum install -y /pkgs/*.rpm # !lbbuild
 # or
-# =lbbuild RUN curl -fsSL https://nexus.at.linbit.com/repository/lbbuild/from_rhel_repos.sh | bash -s -- elfutils-libelf-devel kernel-rpm-macros
+# =lbbuild RUN curl -fsSL https://nexus.at.linbit.com/repository/lbbuild/from_rhel_repos.sh | bash -s -- elfutils-libelf-devel
 
 RUN rm -rf /pkgs
 

docker/Dockerfile.rhel9

@@ -3,7 +3,7 @@ FROM $EXTRAPKGS as extrapkgs
 # by checking for /pkgs we can cache that step
 # and prepare images that already contain the packages.
 RUN mkdir /pkgs
-RUN dnf install -y 'dnf-command(download)' && cd /pkgs && dnf download elfutils-libelf-devel kernel-rpm-macros && rm -f *.i686.rpm # !lbbuild
+RUN dnf install -y 'dnf-command(download)' && cd /pkgs && dnf download elfutils-libelf-devel && rm -f *.i686.rpm # !lbbuild
 
 FROM registry.access.redhat.com/ubi9/ubi
 MAINTAINER Roland Kammerer <[email protected]>
@@ -37,7 +37,7 @@ RUN dnf -y update-minimal --security --sec-severity=Important --sec-severity=Cri
 COPY --from=extrapkgs /pkgs /pkgs
 RUN dnf install -y /pkgs/*.rpm # !lbbuild
 # or
-# =lbbuild RUN curl -fsSL https://nexus.at.linbit.com/repository/lbbuild/from_rhel_repos.sh | bash -s -- elfutils-libelf-devel kernel-rpm-macros
+# =lbbuild RUN curl -fsSL https://nexus.at.linbit.com/repository/lbbuild/from_rhel_repos.sh | bash -s -- elfutils-libelf-devel
 
 RUN rm -rf /pkgs
 

docker/entry.sh

@@ -189,9 +189,26 @@ kos::rpm::bestbyrpmprovides() {
 	local drbd_requires_file
 	shift 1
 
-	sort > "$kernel_provides_file" \
-		<(find "/lib/modules/$(uname -r)" -name "symvers*" | /lib/rpm/kabi.sh) \
-		<(find "/lib/modules/$(uname -r)/kernel" -type f | /lib/rpm/redhat/find-provides.ksyms)
+	local kernel_symvers
+	local cat_prog
+	if [ -e "/lib/modules/"$(uname -r)"/symvers" ]; then
+		kernel_symvers="/lib/modules/"$(uname -r)"/symvers"
+		cat_prog=cat
+	elif [ -e "/lib/modules/"$(uname -r)"/symvers.gz" ]; then
+		kernel_symvers="/lib/modules/"$(uname -r)"/symvers.gz"
+		cat_prog=zcat
+	elif [ -e "/lib/modules/"$(uname -r)"/symvers.xz" ]; then
+		kernel_symvers="/lib/modules/"$(uname -r)"/symvers.xz"
+		cat_prog=xzcat
+	else
+		debug "Failed to find kernel symvers file"
+		return 1
+	fi
+
+	"$cat_prog" "$kernel_symvers" \
+		| awk -F"\t" '{ print "kernel(" $2 ") = " $1 }' \
+		| sort \
+		> "$kernel_provides_file"
 
 	if [ ! -s "$kernel_provides_file" ]; then
 		debug "Failed to generate kernel provides"