buildrpm: do not break in presence of custom user configs

For example, if "hg log" was defined as an alias:

  # /etc/mercurial/hgrc
  [alias]
  log = log --graph

the buildrpm script would be surprised by log messages formatted in
unexpected ways, and bail out.

This patch sets HGPLAIN, effectively resetting all the user configs,
including log output, to a common state, making the build more
predictable across all the possible environments.

contrib/buildrpm

@@ -1,161 +1,163
 #!/bin/bash -e
 #
 # Build a Mercurial RPM from the current repo
 #
 # Tested on
 # - Fedora 20
 # - CentOS 5
 # - centOS 6
 
 . $(dirname $0)/packagelib.sh
 
 BUILD=1
 RPMBUILDDIR="$PWD/rpmbuild"
+export HGPLAIN=
+
 while [ "$1" ]; do
     case "$1" in
     --prepare )
         shift
         BUILD=
         ;;
     --withpython | --with-python)
         shift
         PYTHONVER=2.7.10
         PYTHONMD5=d7547558fd673bd9d38e2108c6b42521
         ;;
     --rpmbuilddir )
         shift
         RPMBUILDDIR="$1"
         shift
         ;;
     * )
         echo "Invalid parameter $1!" 1>&2
         exit 1
         ;;
     esac
 done
 
 cd "`dirname $0`/.."
 
 specfile=$PWD/contrib/mercurial.spec
 if [ ! -f $specfile ]; then
     echo "Cannot find $specfile!" 1>&2
     exit 1
 fi
 
 if [ ! -d .hg ]; then
     echo 'You are not inside a Mercurial repository!' 1>&2
     exit 1
 fi
 
 gethgversion
 
 # TODO: handle distance/node set, and type set
 
 if [ -z "$type" ] ; then
    release=1
 else
     release=0.9_$type
 fi
 
 if [ -n "$distance" ] ; then
     release=$release+$distance_$node
 fi
 
 if [ "$PYTHONVER" ]; then
     release=$release+$PYTHONVER
     RPMPYTHONVER=$PYTHONVER
 else
     RPMPYTHONVER=%{nil}
 fi
 
 mkdir -p $RPMBUILDDIR/{SOURCES,BUILD,SRPMS,RPMS}
 $HG archive -t tgz $RPMBUILDDIR/SOURCES/mercurial-$version-$release.tar.gz
 if [ "$PYTHONVER" ]; then
 (
     mkdir -p build
     cd build
     PYTHON_SRCFILE=Python-$PYTHONVER.tgz
     [ -f $PYTHON_SRCFILE ] || curl -Lo $PYTHON_SRCFILE http://www.python.org/ftp/python/$PYTHONVER/$PYTHON_SRCFILE
     if [ "$PYTHONMD5" ]; then
         echo "$PYTHONMD5 $PYTHON_SRCFILE" | md5sum -w -c
     fi
     ln -f $PYTHON_SRCFILE $RPMBUILDDIR/SOURCES/$PYTHON_SRCFILE
 
     DOCUTILSVER=`sed -ne "s/^%global docutilsname docutils-//p" $specfile`
     DOCUTILS_SRCFILE=docutils-$DOCUTILSVER.tar.gz
     [ -f $DOCUTILS_SRCFILE ] || curl -Lo $DOCUTILS_SRCFILE http://downloads.sourceforge.net/project/docutils/docutils/$DOCUTILSVER/$DOCUTILS_SRCFILE
     DOCUTILSMD5=`sed -ne "s/^%global docutilsmd5 //p" $specfile`
     if [ "$DOCUTILSMD5" ]; then
         echo "$DOCUTILSMD5 $DOCUTILS_SRCFILE" | md5sum -w -c
     fi
     ln -f $DOCUTILS_SRCFILE $RPMBUILDDIR/SOURCES/$DOCUTILS_SRCFILE
 )
 fi
 
 mkdir -p $RPMBUILDDIR/SPECS
 rpmspec=$RPMBUILDDIR/SPECS/mercurial.spec
 
 sed -e "s,^Version:.*,Version: $version," \
     -e "s,^Release:.*,Release: $release," \
     $specfile > $rpmspec
 
 echo >> $rpmspec
 echo "%changelog" >> $rpmspec
 
 if echo $version | grep '+' > /dev/null 2>&1; then
     latesttag="`echo $version | sed -e 's/+.*//'`"
     $HG log -r .:"$latesttag" -fM \
         --template '{date|hgdate}\t{author}\t{desc|firstline}\n' | python -c '
 import sys, time
 
 def datestr(date, format):
     return time.strftime(format, time.gmtime(float(date[0]) - date[1]))
 
 changelog = []
 for l in sys.stdin.readlines():
     tok = l.split("\t")
     hgdate = tuple(int(v) for v in tok[0].split())
     changelog.append((datestr(hgdate, "%F"), tok[1], hgdate, tok[2]))
 prevtitle = ""
 for l in sorted(changelog, reverse=True):
     title = "* %s %s" % (datestr(l[2], "%a %b %d %Y"), l[1])
     if prevtitle != title:
         prevtitle = title
         print
         print title
     print "- %s" % l[3].strip()
 ' >> $rpmspec
 
 else
 
     $HG log \
          --template '{date|hgdate}\t{author}\t{desc|firstline}\n' \
          .hgtags | python -c '
 import sys, time
 
 def datestr(date, format):
     return time.strftime(format, time.gmtime(float(date[0]) - date[1]))
 
 for l in sys.stdin.readlines():
     tok = l.split("\t")
     hgdate = tuple(int(v) for v in tok[0].split())
     print "* %s %s\n- %s" % (datestr(hgdate, "%a %b %d %Y"), tok[1], tok[2])
 ' >> $rpmspec
 
 fi
 
 sed -i \
     -e "s/^%define withpython.*$/%define withpython $RPMPYTHONVER/" \
     $rpmspec
 
 if [ "$BUILD" ]; then
     rpmbuild --define "_topdir $RPMBUILDDIR" -ba $rpmspec --clean
     if [ $? = 0 ]; then
         echo
         echo "Built packages for $version-$release:"
         find $RPMBUILDDIR/*RPMS/ -type f -newer $rpmspec
     fi
 else
     echo "Prepared sources for $version-$release $rpmspec are in $RPMBUILDDIR/SOURCES/ - use like:"
     echo "rpmbuild --define '_topdir $RPMBUILDDIR' -ba $rpmspec --clean"
 fi