upd.sh: check appliability of patches

upd.sh

@@ -1,11 +1,15 @@
 #!/usr/bin/env bash
 # Script to partly automate updating this package
+# sudo dnf install /usr/bin/rpmbuild /usr/bin/spectool /usr/bin/rpmspec /usr/bin/git /usr/bin/curl /usr/bin/abf
 
 set -x
 set -e
 set -f
 set -u
 
+# try to avoid asking for password in `sudo mount -t tmpfs <...>`
+#sudo echo
+
 spec=chromium-browser-stable.spec
 
 old_version="$(rpmspec -q --srpm --qf '%{version}' "$spec")"
@@ -31,6 +35,15 @@ sed -E -i'' "$spec" \
 	--
 
 spectool --get-files --source 0,1101,1102 "$spec"
+
+# check appliability of patches
+patches_ok=0
+# unpack >8 GiB of source code, I do not have so much RAM to store it in tmpfs
+tmp="$(mktemp --tmpdir=/var/tmp -d)"
+#sudo mount -t tmpfs -o size=30G tmpfs "$tmp"
+trap 'if [ "$patches_ok" = 1 ]; then rm -fr "$tmp"; fi' EXIT
+rpmbuild --define "_sourcedir $PWD" --define "_builddir $tmp" -bp "$spec" && patches_ok=1
+
 sed -i'' .abf.yml -e '/^  chromium-/d' -e '/^  msspi-/d'
 abf put -n
 # abf put erronously uploads *.json
@@ -40,3 +53,7 @@ sed -i'' .abf.yml -e '/^  master_preferences.json/d'
 PAGER='' git diff
 # can be copypasted for a commit message
 echo "upd: $old_version -> $latest_version"
+
+if [ "$patches_ok" = 0 ]; then
+	echo "PATCHES require attention!"
+fi