1#!/bin/sh
2
3# check for SVN revision number
4revision=$(cat snapshot_version 2> /dev/null)
5test $revision || revision=$(cd "$1" && LC_ALL=C svn info 2> /dev/null | grep Revision | cut -d' ' -f2)
6test $revision || revision=$(cd "$1" && grep revision .svn/entries 2>/dev/null | cut -d '"' -f2)
7test $revision || revision=$(cd "$1" && sed -n -e '/^dir$/{n;p;q}' .svn/entries 2>/dev/null)
8test $revision && revision=SVN-r$revision
9
10# check for git short hash
11if ! test $revision; then
12    revision=$(cd "$1" && git log -1 --pretty=format:%h)
13    test $revision && revision=git-$revision
14fi
15
16# no revision number found
17test $revision || revision=UNKNOWN
18
19# releases extract the version number from the VERSION file
20version=$(cat VERSION 2> /dev/null)
21test $version || version=$revision
22
23test -n "$3" && version=$version-$3
24
25NEW_REVISION="#define FFMPEG_VERSION \"$version\""
26OLD_REVISION=$(cat version.h 2> /dev/null)
27
28# Update version.h only on revision changes to avoid spurious rebuilds
29if test "$NEW_REVISION" != "$OLD_REVISION"; then
30    echo "$NEW_REVISION" > "$2"
31fi
32