Add a config and script for Rawhide done with DNF

This is a temporary measure for testing. It will shadow real rawhide
composes and redo them with depsolving based on DNF.

The composes will land in /mnt/koji/compose/rawhide-dnf and there will
be logs with information about changes in package set.

Nothing will be sent to fedmsg, no mails will be sent.

Only the package set is created, no extra images or even repos are
created.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

fedora-dnf.conf

@@ -0,0 +1,10 @@
+# The same compose as regular nightly Rawhide one, except it uses DNF and does
+# not build any extra images in Koji.
+
+from fedora import *
+
+gather_backend = 'dnf'
+
+# This can only be enabled once DNF 2 is used due to
+# https://bugzilla.redhat.com/show_bug.cgi?id=1260986
+#repoclosure_backend = 'dnf'

nightly-dnf.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+
+# Abort if any command fails or undefined variable is used.
+set -eu
+
+export LC_ALL=C
+
+CONFIG=fedora-dnf.conf
+TARGET_DIR=/mnt/koji/compose/rawhide-dnf
+DATE=$(date +%Y%m%d)
+COMPSDIR=$(mktemp -d "/tmp/rawhide-dnf.$DATE.XXXX")
+COMPSFILE=comps-rawhide.xml
+
+# Clone comps repo, create comps file for rawhide and copy it into current
+# directory.
+git clone https://pagure.io/fedora-comps.git "$COMPSDIR"
+make -C "$COMPSDIR" "$COMPSFILE"
+cp "$COMPSDIR/$COMPSFILE" "$(pwd)/"
+rm -rf "$COMPSDIR"
+
+# Pick yum-based compose to replicate: the one from the same day should do.
+YUM_COMPOSE=/mnt/koji/compose/rawhide/Fedora-Rawhide-$DATE.n.0
+
+# Retrieve Koji event id from it
+EVENT=$(python -m json.tool <"$YUM_COMPOSE/work/global/koji-event" | grep id | tr -d -c '0-9')
+
+# Make sure target directory exists
+mkdir -p $TARGET_DIR
+
+# Run the compose with correct event, and only use the required phases.
+time pungi-koji --config="$CONFIG" --target-dir="$TARGET_DIR" --nightly --koji-event="$EVENT" \
+    --just-phase init --just-phase pkgset --just-phase gather --just-phase test \
+    --old-composes="$TARGET_DIR"
+
+DNF_COMPOSE=$(readlink -f $TARGET_DIR/latest-Fedora-Rawhide)
+
+# Compose was successful, let's compute differences in packages
+LOG_DIR="$DNF_COMPOSE/logs/global/depsolve/"
+mkdir -p "$LOG_DIR"
+
+# For each variant.arch combination there is a separate log file. The filenames
+# contain both variant UID and arch, so they are unique and can be safely
+# copied into one directory.
+for logfile in $YUM_COMPOSE/work/*/pungi/*.log; do
+    # Find path relative to compose topdir: work/<arch>/pungi/<variant>.<arch>.log
+    log=$(echo "$logfile" | rev | cut -d/ -f-4 | rev)
+    # The command exits with 1 if there are differences, so we will suppress
+    # that to avoid having script exit after processing first log.
+    pungi-compare-depsolving "$YUM_COMPOSE/$log" "$DNF_COMPOSE/$log" >"$LOG_DIR/$(basename "$log")" || true
+done
+
+# Delete composes older than 7 days.
+find $TARGET_DIR -xdev -depth -maxdepth 2 -mtime +7 -exec rm -rf {} \;