contrib/buildrpm

inotify: server: new data structure to keep track of changes.

== Rationale for the new structure ==

Current structure was a dictionary tree. One directory was tracked
as a dictionary:
 - keys: file/subdir name
 - values:
    - for a file, the status (a/r/m/...)
    - for a subdir, the directory representing the subdir

It allowed efficient lookups, no matter of the type of the terminal leaf:
    for part in path.split('/'): tree = tree[part]

However, there is no way to represent a directory and a file with the same name
because keys are conflicting in the dictionary. Concrete example:

Initial state:

root dir
 |- foo (file)
 |- bar (file)

# data state is: {'foo': 'n', 'bar': 'n'}

Remove foo:

root dir
 |- bar (file)

# Data becomes {'foo': 'r'} until next commit.

Add foo, as a directory, and foo/barbar file:

root dir
 |- bar (file)
 |-> foo (dir)
  |- barbar (file)

# New state should be represented as:
  {'foo': {'barbar': 'a'}, 'bar': 'n'}
  however, the key "foo" is already used and represents the old file.

The dirstate:
 D foo
 A foo/barbar
cannot be represented, hence the need for a new structure.

== The new structure ==

'directory' class. Represents one directory level.
* Notable attributes:
  Two dictionaries:
   - 'files' Maps filename -> status for the current dir.
   - 'dirs' Maps subdir's name -> directory object representing the subdir
* methods
  - walk(), formerly server.walk
  - lookup(), old server.lookup
  - dir(), old server.dir

This new class allows embedding all the tree walks/lookups in its own class,
instead of having everything mixed together in server.

Incidently, since files and directories are not stored in the same
dictionaries, we are solving the previous key conflict problem.

The small drawback is that lookup operation is a bit more complex:
for a path a/b/c/d/e we have to check twice the leaf, if e is a directory or a
file.

#!/bin/sh
#
# Build a Mercurial RPM in place.
#
# Bryan O'Sullivan <[e-mail]>
#
# Tested on
# - Fedora 10
# - Fedora 11
# - Centos 5.3 (with Fedora EPEL repo for asciidoc)

HG="`dirname $0`/../hg"
PYTHONPATH="`dirname $0`/../mercurial/pure"
export PYTHONPATH

root="`$HG root 2>/dev/null`"
specfile=contrib/mercurial.spec

if [ -z "$root" ]; then
    echo 'You are not inside a Mercurial repository!' 1>&2
    exit 1
fi

rpmdir=/tmp/"`basename $root | sed 's/ /_/'`"-rpm # FIXME: Insecure /tmp handling

cd "$root"
rm -rf $rpmdir
mkdir -p $rpmdir/RPMS
$HG clone "$root" $rpmdir/BUILD

if [ ! -f $specfile ]; then
    echo "Cannot find $specfile!" 1>&2
    exit 1
fi

tmpspec=/tmp/`basename "$specfile"`.$$ # FIXME: Insecure /tmp handling
# Use the most recent tag as the version.
version=`$HG tags | python -c 'import sys; print [l for l in sys.stdin.readlines() if l[0].isdigit()][0].split()[0]'`
# Compute the release number as the difference in revision numbers
# between the tip and the most recent tag.
release=`$HG tags | python -c 'import sys; l = sys.stdin.readlines(); print int(l[0].split()[1].split(":")[0]) - int([x for x in l if x[0].isdigit()][0].split()[1].split(":")[0])'`
tip=`$HG -q tip`

# Beat up the spec file
sed -e 's,^Source:.*,Source: /dev/null,' \
    -e "s,^Version:.*,Version: $version," \
    -e "s,^Release:.*,Release: $release," \
    -e "s,^%prep.*,Changeset: $tip\n\0," \
    -e 's,^%setup.*,,' \
    $specfile > $tmpspec

cat <<EOF >> $tmpspec
%changelog
* `LANG=en_US date +'%a %b %d %Y'` `$HG showconfig ui.username` $version-$release
- Automatically built via $0

EOF
$HG log \
     --template '* {date|rfc822date} {author}\n- {desc|firstline}\n\n' \
     .hgtags \
  | sed -e 's/^\(\* [MTWFS][a-z][a-z]\), \([0-3][0-9]\) \([A-Z][a-z][a-z]\) /\1 \3 \2 /' \
        -e '/^\* [MTWFS][a-z][a-z] /{s/ [012][0-9]:[0-9][0-9]:[0-9][0-9] [+-][0-9]\{4\}//}' \
   >> $tmpspec

rpmbuild --define "_topdir $rpmdir" -bb $tmpspec
if [ $? = 0 ]; then
    rm -rf $tmpspec $rpmdir/BUILD
    mv $rpmdir/RPMS/*/* $rpmdir && rm -r $rpmdir/RPMS
    echo
    echo "Packages are in $rpmdir:"
    ls -l $rpmdir/*.rpm
fi