kernel-install: allow overriding the plugin list too

The use of IFS=<newline> is dropped. Let's just iterate over the list, using
any whitespace as separator.

2 files changed, 20 insertions, 10 deletions

diff --git a/man/kernel-install.xml b/man/kernel-install.xml
index bde30ab16a..7ad7f86c6d 100644
--- a/man/kernel-install.xml
+++ b/man/kernel-install.xml
@@ -255,6 +255,11 @@
       <filename>install.conf</filename>, <filename>entry-token</filename>, and other files will be
       read from this directory.</para>
 
+      <para><varname>$KERNEL_INSTALL_PLUGINS</varname> can be set to override the list of plugins executed by
+      <command>kernel-install</command>. The argument is a whitespace-separated list of paths.
+      <literal>KERNEL_INSTALL_PLUGINS=:</literal> may be used to prevent any plugins from running.
+      </para>
+
       <para><varname>$MACHINE_ID</varname> can be set for <command>kernel-install</command> to override
       <varname>$KERNEL_INSTALL_MACHINE_ID</varname>, the machine ID.</para>
 
diff --git a/src/kernel-install/kernel-install.in b/src/kernel-install/kernel-install.in
index 96595fa295..30b28f4658 100755
--- a/src/kernel-install/kernel-install.in
+++ b/src/kernel-install/kernel-install.in
@@ -312,15 +312,20 @@ MAKE_ENTRY_DIR_ABS=$?
 
 ret=0
 
-PLUGINS="$(
-    dropindirs_sort ".install" \
-        "/etc/kernel/install.d" \
-        "/usr/lib/kernel/install.d"
-)"
-IFS="
-"
+if [ -z "$KERNEL_INSTALL_PLUGINS" ]; then
+    KERNEL_INSTALL_PLUGINS="$(
+        dropindirs_sort ".install" \
+            "/etc/kernel/install.d" \
+            "/usr/lib/kernel/install.d"
+    )"
+fi
 
-[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && printf '%s\n' "Plugin files:" "$PLUGINS"
+if [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ]; then
+    printf '%s\n' "Plugin files:"
+    for f in $KERNEL_INSTALL_PLUGINS; do
+        printf '%s\n' "$f"
+    done
+fi
 
 case "$COMMAND" in
     add)
@@ -346,7 +351,7 @@ case "$COMMAND" in
             fi
         fi
 
-        for f in $PLUGINS; do
+        for f in $KERNEL_INSTALL_PLUGINS; do
             [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "+$f add $KERNEL_VERSION $ENTRY_DIR_ABS" "$@"
             "$f" add "$KERNEL_VERSION" "$ENTRY_DIR_ABS" "$@"
 
@@ -357,7 +362,7 @@ case "$COMMAND" in
         ;;
 
     remove)
-        for f in $PLUGINS; do
+        for f in $KERNEL_INSTALL_PLUGINS; do
             [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "+$f remove $KERNEL_VERSION $ENTRY_DIR_ABS"
             "$f" remove "$KERNEL_VERSION" "$ENTRY_DIR_ABS"
             err=$?