SoundSoftware Code Site

#!/bin/bash

#

# Convert an Hg repo with subrepos into a new repo in which the

# subrepo contents are included in the main repo. The history of the

# original and its subrepos is retained.

#

# Note that this script invokes itself, in order to handle nested

# subrepos.

#

# While this does work, I'm not convinced it's entirely a good

# idea. The history ends up a bit of a mess, and if it's a preliminary

# to converting to git (which is one obvious reason to do this), the

# history ends up even messier after that conversion.

set -ex

repo="$1"

target="$2"

target_subdir="$3"

revision="$4"

if [ -z "$repo" ] || [ -z "$target" ]; then

    echo "usage: $0 <repo-url> <target-dir> [<target-subdir> <revision>]"

    exit 2

fi

set -u

myname="$0"

mydir=$(dirname "$myname")

reponame=$(basename "$repo")

tmpdir="/tmp/flatten_$$"

mkdir -p "$tmpdir"

trap "rm -rf ${tmpdir}" 0

filemap="$tmpdir/filemap"

tmprepo="$tmpdir/tmprepo"

subtmp="$tmpdir/subtmp"

if [ -n "$revision" ]; then

    hg clone -r "$revision" "$repo" "$tmprepo"

else

    hg clone "$repo" "$tmprepo"

fi

read_sub() {

    if [ -f "$tmprepo/.hgsub" ]; then

	cat "$tmprepo/.hgsub" | sed 's/ *= */,/'

    fi

}

(   echo "exclude .hgsub"

    echo "exclude .hgsubstate"

    read_sub | while IFS=, read dir uri; do

	echo "exclude $dir"

    done

    if [ -n "$target_subdir" ]; then

	echo "rename . $target_subdir"

    fi

) > "$filemap"

hg convert --filemap "$filemap" "$tmprepo" "$target"

(   cd "$target"

    hg update

)

read_sub | while IFS=, read dir uri; do

    rm -rf "$subtmp"

    revision=$(grep ' '"$dir"'$' "$tmprepo/.hgsubstate" | awk '{ print $1; }')

    if [ -n "$target_subdir" ]; then

	"$myname" "$tmprepo/$dir" "$subtmp" "$target_subdir/$dir" "$revision"

    else

	"$myname" "$tmprepo/$dir" "$subtmp" "$dir" "$revision"

    fi

    (   cd "$target"

	hg pull -f "$subtmp" &&

	    hg merge --tool internal:local &&

	    hg commit -m "Merge former subrepo $dir"

    )

done