publish-purge: a cleanup script for publish's dir

publish-purge considers for each directory in pubish's $base directory a
TTL (time to live) that is configured by ~/.publish-purge.cfg and is
overriden by a local .publish.ttl file. A new option -t in publish lets
publish include a local .publish.ttl file if we wish to set a specific
TTL.

Signed-off-by: Peter Palfrader <peter@palfrader.org>

git-svn-id: svn+ssh://asteria.noreply.org/svn/weaselutils/trunk@564 bc3d92e2-beff-0310-a7cd-cc87d7ac0ede

1 files changed, 95 insertions, 0 deletions

diff --git a/publish-purge b/publish-purge
new file mode 100755
index 0000000..8443cf0
--- /dev/null
+++ b/publish-purge
@@ -0,0 +1,95 @@
+#!/bin/bash
+
+set -e
+
+
+test_if_ancient()
+{
+    d=$1
+    ttl=$2
+
+    mtime=$(stat --format "%Y" "$d")
+    tod=$(($mtime + 3600*24*$ttl))
+    now=$(date +%s)
+
+    [ "$optVerbose" -ge "2" ] && echo "Consider $d: ttl=$ttl, mod time=$mtime, time of death=$tod, now=$now"
+
+    [ "$tod" -lt "$now" ] && return 0
+    return 1
+}
+
+
+cleanit()
+{
+    d=$1
+    [ -d "$d" ] || exit 0
+    [ -e $d/.publish.ttl ] && ttl=`cat $d/.publish.ttl`
+
+    if test_if_ancient $d $ttl; then
+        [ "$optVerbose" -ge "1" ] && echo "Purge $d"
+        rm -rf "$d"
+    fi
+    return 0
+}
+
+usage()
+{
+    cat << EOF
+usage: $0 [OPTIONS]
+
+OPTIONS:
+   -h     Show this message.
+   -v     Give verbose output. Be more verbose with -vv.
+EOF
+}
+
+optVerbose=0
+
+while getopts "vh" OPTION; do
+    case $OPTION in
+        h)
+            usage
+            ;;
+        v)
+            optVerbose=$(($optVerbose + 1))
+            ;;
+    esac
+done
+
+
+ttl=14
+[ -e ~/.publish-purge.cfg ] && . ~/.publish-purge.cfg
+
+# We would not like that cleanit removes files in directories that mallory set
+# as $base
+if ! stat --format=%a ~/.publish-purge.cfg | egrep -q ".00"; then
+    echo "For security reasons ~/.publish-purge.cfg should have no perms for group and others."
+fi
+
+if [ -z "$base" ]; then
+    echo "Please setup \$base in ~/.publish-purge.cfg"
+    exit 1
+fi
+
+if ! [ -e "$base" ]; then
+    echo "Unknown base directory $base"
+    exit 1
+fi
+
+cd $base
+# We would not like to accidentily delete files in the wrong directory, hence
+# the paranoia check
+if ! [ -e .publish-purge.token ]; then
+    echo "Place a .publish-purge.token in $base"
+    exit 1
+fi
+
+for d in *; do
+    pushd . > /dev/null
+    # we launch a subshell so that setting $ttl within the subshell
+    # is not visible outside the subshell
+    ( cleanit $d )
+    popd > /dev/null
+done
+
+