#!/bin/sh
# $Id: verify-revisions.sh 280 2010-08-19 15:57:27Z stsp $

# Copyright 2010 Stefan Sperling <stsp@elego.de>, elego Software Solutions GmbH
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

# This script checks all revisions in one or more Subversion FSFS repositories,
# using fsfsverify.py.

if [ -z "$1" ]
then
        echo "Usage: `basename $0` repos1 [repos2 ...]"
        exit 1
fi

# Select a UNIX tool to produce numerical sequences
if which seq >/dev/null 2>/dev/null
then
        _seq="`which seq`"
elif which jot >/dev/null 2>/dev/null
then
        _seq="`which jot`"
else
        echo "No tool for producing numerical sequences found in \$PATH"
        echo "Please install one of these tools: seq, jot"
        exit 1
fi

# Make sure fsfsverify.py is in $PATH
if ! which fsfsverify.py >/dev/null 2>/dev/null
then
        echo -n "fsfsverify.py not found in \$PATH - "
        echo -n "please get fsfsverify.py from "
        echo "http://svn.apache.org/repos/asf/subversion/trunk/contrib/server-side/fsfsverify.py"
        exit 1
fi

let n_repos=0

for repository in "$@"
do
        head_rev="`svnlook youngest \"$repository\"`"
        if [ -z "$head_rev" ]
        then
                echo -n "Cannot determine HEAD revision of repository "
                echo "$repository - skipping"
                continue
        fi

        if [ "$head_rev" == "0" ]
        then
                echo "Repository $repository has zero revisions - skipping"
                continue
        fi

        if [ "`cat $repository/db/fs-type`" != "fsfs" ]
        then
                echo -n "Repository $repository "
                echo "does not use an FSFS database - skipping"
                continue
        fi

        # Check if the repository is sharded
        layout_sharded=`grep "^layout sharded" "$repository/db/format"`
        if [ -n "$layout_sharded" ]
        then
                shards="`echo $layout_sharded | \
                        sed -e 's/layout sharded \([0-9]*\)/\1/'`"
                if [ -z "$shards" ]
                then
                        echo -n "Repository $repository seems to be shared, "
                        echo -n "but could not determine number of shards - "
                        echo "skipping"
                        continue
                fi
        else
                shards=""
        fi

        bad_revs=""
        for revision in `$_seq $head_rev`
        do
                if [ -n "$shards" ]
                then
                        shard_dir="`expr $revision / $shards`"
                else
                        shard_dir=""
                fi

                if [ -f "$repository/db/revs/${shard_dir}.pack" ]
                then
                        echo -n "Repository $repository has packing enabled "
                        echo "but fsfsverify.py does not support packed FSFS "
                        echo "repositories - skipping"
                        break
                fi

                echo -n "Checking $repository r${revision}: "
                fsfsverify.py "$repository/db/revs/$shard_dir/$revision" >/dev/null
                if [ "$?" != "0" ]
                then
                        echo "BAD"
                        bad_revs="$bad_revs $revision"
                else
                        echo "ok"
                fi
                
        done

        let n_repos="`expr $n_repos + 1`"

        if [ -n "$bad_revs" ]
        then
                this_bad_repos="The following revisions of $repository"
                this_bad_repos="$this_bad_repos are bad: $bad_revs"
                echo "$this_bad_repos"
                all_bad_repos="${all_bad_repos}$this_bad_repos\n"
        fi
done

if [ $n_repos -gt 1 ]
then
        echo
        echo "Summary:"
        echo "$all_bad_repos"
fi