kernel: Always choose proper stable versions

Dockerfile

@@ -12,43 +12,41 @@ COPY requirements.txt /srv
 WORKDIR /srv
 
 RUN \
-# Create user
+    # Create user
     addgroup -g 423 -S kernelcollector \
     && adduser -u 423 -S kernelcollector -G kernelcollector \
-# Upgrade system
+    # Upgrade system
     && apk update \
-    && apk add --no-cache --virtual .dev-deps g++ clang autoconf gettext-tiny libtool automake make wget bzip2-dev libmd-dev linux-headers perl zlib-dev zstd-dev file patch grep \
+    && apk add --no-cache --virtual .dev-deps g++ clang autoconf gettext-tiny libtool automake make curl bzip2-dev libmd-dev linux-headers perl zlib-dev zstd-dev file patch grep \
     && apk add --no-cache gnupg gzip fakeroot xz tar zlib bzip2 zstd-libs libmd \
-# Compile dpkg from source (needed for zstd support)
+    # Compile dpkg from source (needed for zstd support)
     && cd /tmp \
-# Find latest version of dpkg
+    # Find latest version of dpkg
     && DPKG_URL="http://archive.ubuntu.com/ubuntu/pool/main/d/dpkg" \
-    && DPKG_VERSION=$(wget -q -O - "$DPKG_URL/?C=M;O=D" | grep -Poh -m 1 "(?<=\")dpkg_.+\.tar\.xz(?=\")") \
-    && wget "$DPKG_URL/$DPKG_VERSION" \
-    && tar -xf *.tar.xz \
-    && rm -rf *.tar.xz \
-    && cd dpkg-* \
+    && DPKG_VERSION=$(curl -Ls "$DPKG_URL/?C=M;O=D" | grep -Poh -m 1 "(?<=\")dpkg_.+\.tar\.xz(?=\")") \
+    && curl -Ls "$DPKG_URL/$DPKG_VERSION" | tar -xJ \
+    && cd dpkg* \
     && if [[ -f configure ]]; then rm configure; fi \
     && ./autogen \
     && chmod +x configure \
     && ./configure --prefix=/usr \
-         --sysconfdir=/etc \
-         --localstatedir=/tmp \
-         --with-libz \
-         --with-libbz2 \
-         --with-libzstd \
-         --disable-dselect \
-         --disable-start-stop-daemon \
-         --disable-nls \
-         --disable-static \
-         --disable-devel-docs \
+    --sysconfdir=/etc \
+    --localstatedir=/tmp \
+    --with-libz \
+    --with-libbz2 \
+    --with-libzstd \
+    --disable-dselect \
+    --disable-start-stop-daemon \
+    --disable-nls \
+    --disable-static \
+    --disable-devel-docs \
     && make -j$(nproc) \
     && make install \
     && cd /srv \
-# Install Python dependencies
+    # Install Python dependencies
     && pip install --no-cache --upgrade -r requirements.txt \
     && chown -R kernelcollector:kernelcollector . \
-# Cleanup
+    # Cleanup
     && apk del .dev-deps \
     && rm -rf /tmp/* /var/cache/apk/*
 

kernelcollector/package_collector.py

@@ -107,6 +107,12 @@ def get_kernel_releases(self):
         stable_version = stable_entry.find('strong').text
         stable_download_link = stable_entry.find('a', {'title': 'Download complete tarball'})['href']
 
+        stable_version_tuple = utils.release_to_tuple(stable_version)[0:2]
+        mainline_version_tuple = utils.release_to_tuple(mainline_version)[0:2]
+
+        if stable_version_tuple < mainline_version_tuple and '-rc' not in mainline_version:
+            return mainline_version, mainline_download_link, mainline_version, mainline_download_link
+
         return stable_version, stable_download_link, mainline_version, mainline_download_link
 
     def get_ubuntu_releases(self):