[PATCH 3/3] reports.mk: use process substitution to dedup

[Michael Shigorin]

The first half of both pipes was clearly a copy-pasted
initial logfile processing; the file can be of considerable
size (e.g. several megabytes) so it might be slightly more
efficient and cool (but a bit more arcane) to use bash(1)'s
process substitution along with good ol' tee(1) like this:

$ echo -e '1\n2\n3' |tee /dev/stderr 2> >(grep 2 >STDERR) |grep 1 >STDOUT
$ head STD*
==> STDERR <==
2

==> STDOUT <==
1
---
 reports.mk | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/reports.mk b/reports.mk
index 7b81e785a..247c722b5 100644
--- a/reports.mk
+++ b/reports.mk
@@ -78,11 +78,10 @@ reports/contents: reports/prep
 	esac
 
 reports/packages: reports/prep
-	@grep -E 'chroot/.in/[^/]*.rpm' < $(BUILDLOG) | \
-		cut -d' ' -f 1 | tr -d "'"'`' | sed 's,^.*/,,' | \
-		sort -u > "$(REPORTDIR)/list-rpms.txt"
 	@grep -E 'chroot/.in/[^/]*.rpm' < $(BUILDLOG) | \
 		cut -d' ' -f 1 | tr -d "'"'`' | \
+		tee /dev/stderr 2> >(sed 's,^.*/,,' | \
+			sort -u > "$(REPORTDIR)/list-rpms.txt") | \
 		xargs rpm -qp --queryformat '%{sourcerpm}\n' | \
 		sort -u > "$(REPORTDIR)/list-srpms.txt"
 
-- 
2.25.4


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