weak-modules: add support for zstd compression for initramfs

* weak-modules (decompress_initramfs): Rewrite decompressing
of initramfs into a loop that iterates over different compression
programs, include zstd in the list.
* kmod.spec (Release): Bump to 11.
(%changelog): Add a record.

Resolves: RHEL-74288
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>

kmod.spec

@@ -16,7 +16,7 @@
 
 Name:		kmod
 Version:	31
-Release:	10%{?dist}
+Release:	11%{?dist}
 Summary:	Linux kernel module management utilities
 
 # https://docs.fedoraproject.org/en-US/legal/license-field/#_no_effective_license_analysis
@@ -196,6 +196,10 @@ install -m 0644 %{SOURCE2} $RPM_BUILD_ROOT%{_sysconfdir}/depmod.d/dist.conf
 %{_libdir}/libkmod.so
 
 %changelog
+* Tue Jan 14 2025 Eugene Syromiatnikov <esyr@redhat.com> - 31-11
+- Enable zstd compression support for initramfs in weak-modules
+- Resolves: RHEL-74288
+
 * Tue Oct 29 2024 Troy Dawson <tdawson@redhat.com> - 31-10
 - Bump release for October 2024 mass rebuild:
   Resolves: RHEL-64018

weak-modules

@@ -129,6 +129,7 @@ read_modules_list() {
 decompress_initramfs() {
     local input=$1
     local output=$2
+    local zcmd
 
     # First, check if this is compressed at all
     if cpio -i -t < "$input" > /dev/null 2>/dev/null; then
@@ -146,15 +147,12 @@ decompress_initramfs() {
         return 0
     fi
 
-    # Try gzip
-    if gzip -cd < "$input" > "$output" 2>/dev/null ; then
-        return 0
-    fi
-
-    # Next try xz
-    if xz -cd < "$input" > "$output" 2>/dev/null ; then
+    # Try zstd/xz/gzip for decompressing
+    for zcmd in zstd xz gzip; do
+        if "$zcmd" -cd < "$input" > "$output" 2>/dev/null ; then
             return 0
         fi
+    done
 
     echo "Unable to decompress $input: Unknown format" >&2
     return 1