1 files changed, 89 insertions, 0 deletions
diff --git a/src/recipes/use-current-kernel.sh b/src/recipes/use-current-kernel.sh
new file mode 100644
index 0000000..2b82a25
--- /dev/null
+++ b/src/recipes/use-current-kernel.sh
@@ -0,0 +1,89 @@
+# Download kernel updates from Slackware Current for a stable release.
+#
+# For this to work, make sure the kernel packages are blacklisted in
+# /etc/slackpkg/blacklist.
+#
+#  kernel-generic.*
+#  kernel-huge.*
+#  kernel-modules.*
+#  kernel-source.*
+#
+# This script uses an unusual pattern for running commands on exit, similar to
+# Golang's defer.  These will not be run when the script is stopped with
+# Control+c.
+#
+# D="[command]; $D"; trap "$D" EXIT
+#
+
+echo "Checking kernel updates from Slackware Current (slackpkg)..."
+
+# Get Slackware version.
+source /etc/os-release
+
+SOURCE=$(sed -n '
+        # Remove leading and trailing blanks
+        s/^[[:blank:]]*//
+        s/[[:blank:]]*$//
+        # Only one token is allowed per line
+        /[[:blank:]]/d
+        # A single solidus should end the URI
+        s,[/]*$,/,
+        # Print the lines beginning with one of the URI schemes we look for
+        \@^file://@p
+        \@^cdrom://@p
+        \@^local://@p
+        \@^https\{0,1\}://@p
+        \@^ftps\{0,1\}://@p' /etc/slackpkg/mirrors)
+SOURCE="$(echo $SOURCE | sed 's/-$VERSION/-current/')"
+
+yes y | slackpkg -mirror="$SOURCE" -batch=on -default_answer=yes update
+D="yes | slackpkg -batch=on -default_answer=yes update"; trap "$D" EXIT
+
+PACKAGE_UPDATES="$(mktemp /tmp/slack-autoupdate.XXXXXX)"
+D="rm -f ${PACKAGE_UPDATES}; $D"; trap "$D" EXIT
+
+mv /etc/slackpkg/blacklist /etc/slackpkg/blacklist.orig
+touch /etc/slackpkg/blacklist
+D="mv -f /etc/slackpkg/blacklist.orig /etc/slackpkg/blacklist; $D"; trap "$D" EXIT
+
+slackpkg -batch=on -default_answer=n \
+  upgrade kernel \
+  | grep "\.t.z$" \
+  | tee "$PACKAGE_UPDATES"  \
+  || exit "$?"
+
+if [ ! -s "$PACKAGE_UPDATES" ]; then
+  # No updates
+  exit 0
+fi
+
+while read PKG; do
+  PKG_URL="$(
+    grep "${PKG}$" /var/lib/slackpkg/CHECKSUMS.md5 \
+      | tr -s ' ' \
+      | cut -f 2 -d ' '
+    )" || exit "$?"
+
+  wget \
+    --directory-prefix="$STAGING_DIR" \
+    "${SOURCE}${PKG_URL}" \
+    "${SOURCE}${PKG_URL}.asc" \
+    || exit 1
+done <"$PACKAGE_UPDATES"
+
+if ! gpg2 --verify-files "$STAGING_DIR"/kernel-*.asc; then
+  echo "gpg verification failed"
+  exit 1
+fi
+
+(
+  # Redirect this subshell's standard output to info file.
+  exec 1>>"$UPDATE_INFO"
+
+  echo "## Slackware current kernel updates"
+  echo
+  while read PKG; do
+    echo " - $PKG"
+  done <"$PACKAGE_UPDATES"
+  echo
+)