Merge ~cjwatson/launchpad-bastion-scripts:rsync-scripts into launchpad-bastion-scripts:main

[Colin Watson]

Add rsync log-handling scripts from carob

We're moving the function of "system from which we can read Launchpad production logs" from carob to the PS5 Launchpad bastion, so it would be helpful to have some convenience scripts in `stg-launchpad`'s search path. People have been copying these around from my home directory for a while, so having them in revision control would be no bad thing.

[Guruprasad (lgp171188)]

LGTM 👍

review: Approve

diff --git a/rcat b/rcat
new file mode 100755
index 0000000..26f2ad5
--- /dev/null
+++ b/rcat
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+REMOTE=$1
+TEMPFILE=$(mktemp)
+
+cleanup () {
+        if [ "$SEED" ]; then
+                cp -a "$TEMPFILE" "$SEED"
+        fi
+        rm -f "$TEMPFILE"
+}
+trap cleanup EXIT HUP INT QUIT TERM
+
+if [ "$SEED" ]; then
+        cp -a "$SEED" "$TEMPFILE"
+fi
+rsync -q "$REMOTE" "$TEMPFILE"
+case $REMOTE in
+        *.gz)   zcat "$TEMPFILE" ;;
+        *.bz2)  bzcat "$TEMPFILE" ;;
+        *.xz)   xzcat "$TEMPFILE" ;;
+        *)      cat "$TEMPFILE" ;;
+esac
diff --git a/rless b/rless
new file mode 100755
index 0000000..5d7829c
--- /dev/null
+++ b/rless
@@ -0,0 +1,28 @@
+#!/bin/sh
+
+REMOTE=$1
+TEMPFILE=$(mktemp)
+PATTERN=$2
+
+cleanup () {
+        if [ "$SEED" ]; then
+                cp -a "$TEMPFILE" "$SEED"
+        fi
+        rm -f "$TEMPFILE"
+}
+trap cleanup EXIT HUP INT QUIT TERM
+
+if [ "$SEED" ]; then
+        cp -a "$SEED" "$TEMPFILE"
+fi
+case $REMOTE in
+        *.gz)   SHOW="zcat $TEMPFILE" ;;
+        *.bz2)  SHOW="bzcat $TEMPFILE" ;;
+        *.xz)   SHOW="xzcat $TEMPFILE" ;;
+        *)      SHOW="cat $TEMPFILE" ;;
+esac
+if [ "$PATTERN" ]; then
+        SHOW="$SHOW | egrep \"$PATTERN\""
+fi
+rsync -q "$REMOTE" "$TEMPFILE"
+eval "$SHOW" | less
diff --git a/rtail b/rtail
new file mode 100755
index 0000000..035f55b
--- /dev/null
+++ b/rtail
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+REMOTE=$1
+TEMPFILE=$(mktemp)
+PATTERN=$2
+
+cleanup () {
+        if [ "$SEED" ]; then
+                cp -a "$TEMPFILE" "$SEED"
+        fi
+        rm -f "$TEMPFILE"
+}
+trap cleanup EXIT HUP INT QUIT TERM
+
+if [ "$SEED" ]; then
+        cp -a "$SEED" "$TEMPFILE"
+fi
+case $REMOTE in
+        *.gz)   SHOW="zcat $TEMPFILE" ;;
+        *.bz2)  SHOW="bzcat $TEMPFILE" ;;
+        *.xz)   SHOW="xzcat $TEMPFILE" ;;
+        *)      SHOW="cat $TEMPFILE" ;;
+esac
+if [ "$PATTERN" ]; then
+        SHOW="$SHOW | egrep \"$PATTERN\""
+fi
+watch -n5 "rsync -q $REMOTE $TEMPFILE; $SHOW | tail -n$(($(tput lines) - ${ROWS_GRACE:-6})) | cut -c1-$(tput cols)"