update_ucode: avoid calling find on non-existing directories

During various reasons (specifically, due to being called at various
stags of mirocode_ctl installation/upgrade) it is possible that some
directories do not exist, which is problematic, as find exits
with non-zero exit code if being called on them.  Avoid that by wrapping
find calls in a function that checks that the first find argument
is indeed an existing directory before calling find itself.

* update_ucode (find_d): New function.
Convert find calls that are not prefixed with $cmd into find_d calls.
* microcode_ctl.spec (Release): Bump to 4.
(%changelog): Mention it.

Resolves: #2231065
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>

microcode_ctl.spec

@@ -13,7 +13,7 @@
 Summary:        CPU microcode updates for Intel x86 processors
 Name:           microcode_ctl
 Version:        %{intel_ucode_version}
-Release:        3%{?dist}
+Release:        4%{?dist}
 Epoch:          4
 License:        CC0 and Redistributable, no modification permitted
 URL:            https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files
@@ -544,6 +544,10 @@ rm -rf %{buildroot}
 
 
 %changelog
+* Tue Aug 01 2023 Eugene Syromiatnikov <esyr@redhat.com> - 4:20230214-4
+- Avoid spurious find failures due to calls on directories that may not exist
+  (#2231065).
+
 * Wed Jun 28 2023 Eugene Syromiatnikov <esyr@redhat.com> - 4:20230214-3
 - Force locale to C in check_caveats, reload_microcode, and update_ucode
   (#2218096).

update_ucode

@@ -17,6 +17,11 @@ usage()
 
 debug() { [ 0 = "$verbose" ] || echo "$*" >&2; }
 
+# Calls find only if the first argument exists and is a directory.
+# Avoids spurious "find: '...' No such file or directory" for the directories
+# that may not exist.
+find_d() { [ \! -d "$1" ] || find "$@"; }
+
 MC_DIR=/usr/share/microcode_ctl
 INTEL_UCODE_DIR=intel-ucode
 DATA_DIR=/usr/share/microcode_ctl/ucode_with_caveats
@@ -81,7 +86,7 @@ add|remove|refresh|list)
 	if [ -z "$kernel" ]; then
 		debug "No kernel versions provided, scanning..."
 
-		kvers=$(find /lib/modules/ -name '[2-9].*' -print)
+		kvers=$(find_d /lib/modules/ -name '[2-9].*' -print)
 		for k_dir in $kvers; do
 			k="${k_dir#/lib/modules/}"
 			[ ! -e "${k_dir}/symvers.gz" ] || {
@@ -90,7 +95,7 @@ add|remove|refresh|list)
 			}
 		done
 
-		kvers=$(find /lib/firmware/ -name '[2-9].*' -print)
+		kvers=$(find_d /lib/firmware/ -name '[2-9].*' -print)
 		for k_dir in $kvers; do
 			k="${k_dir#/lib/firmware/}"
 			[ ! -d "$k_dir" ] || {
@@ -131,7 +136,7 @@ while :; do
 	refresh|remove|list)
 		debug "  Removing old files from ${FW_DIR}/${INTEL_UCODE_DIR}"
 		if [ 0 = "$remove_cleanup" ]; then
-			find "${MC_DIR}/${INTEL_UCODE_DIR}" \
+			find_d "${MC_DIR}/${INTEL_UCODE_DIR}" \
 				-maxdepth 1 -mindepth 1 \
 				-type f -printf '%f\n'
 		else
@@ -154,7 +159,7 @@ while :; do
 		done
 		[ "xlist" = "x$action" ] || {
 			# Removing possible dangling symlinks
-			find "${FW_DIR}/${INTEL_UCODE_DIR}" \
+			find_d "${FW_DIR}/${INTEL_UCODE_DIR}" \
 				-maxdepth 1 -mindepth 1 \
 				-type l -printf '%p\n' \
 			| while read -r fname; do
@@ -216,7 +221,7 @@ fi | while read -r i; do
 				debug "    Removing \"$paths\" (part of $action)..."
 
 			for p in $(printf "%s" "$paths"); do
-				find "$DATA_DIR/$i" -path "$DATA_DIR/$i/$p" \
+				find_d "$DATA_DIR/$i" -path "$DATA_DIR/$i/$p" \
 					-printf "%P\n"
 			done | while read -r path; do
 				[ -e "$FW_DIR/$k/readme-$i" ] || {
@@ -274,7 +279,7 @@ fi | while read -r i; do
 			}
 
 			for p in $(printf "%s" "$paths"); do
-				find "$DATA_DIR/$i" -path "$DATA_DIR/$i/$p" \
+				find_d "$DATA_DIR/$i" -path "$DATA_DIR/$i/$p" \
 					-printf "%P\n"
 			done | while read -r path; do
 				[ ! -e "$FW_DIR/$k/$path" ] || {
@@ -307,7 +312,7 @@ done
 debug "Checking for dangling symlinks..."
 for k in $(echo "$kernel"); do
 	debug "  Processing kernel version \"$k\""
-	find "${FW_DIR}/${k}" \
+	find_d "${FW_DIR}/${k}" \
 		-mindepth 1 -type l -printf '%p\n' \
 	| while read -r fname; do
 		[ -e "$fname" ] || {