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#!/bin/sh

# Copyright (c) 2007, 2008 Rocco Rutte <pdmef@gmx.net> and others.
# License: MIT <http://www.opensource.org/licenses/mit-license.php>

ROOT="`dirname $0`"
REPO=""
PFX="hg2git"
SFX_MAPPING="mapping"
SFX_MARKS="marks"
SFX_HEADS="heads"
SFX_STATE="state"
GFI_OPTS=""
PYTHON=${PYTHON:-python}

USAGE="[--quiet] [-r <repo>] [--force] [-m <max>] [-s] [-A <file>] [-M <name>] [-o <name>]"
LONG_USAGE="Import hg repository <repo> up to either tip or <max>
If <repo> is omitted, use last hg repository as obtained from state file,
GIT_DIR/$PFX-$SFX_STATE by default.

Note: The argument order matters.

Options:
-m Maximum revision to import
--quiet Passed to git-fast-import(1)
-s Enable parsing Signed-off-by lines
-A Read author map from file
(Same as in git-svnimport(1) and git-cvsimport(1))
-r Mercurial repository to import
-M Set the default branch name (default to 'master')
-o Use <name> as branch namespace to track upstream (eg 'origin')
--force Ignore validation errors when converting, and pass --force
to git-fast-import(1)
"

. "$(git --exec-path)/git-sh-setup"
cd_to_toplevel

while case "$#" in 0) break ;; esac
do
case "$1" in
    -r|--r|--re|--rep|--repo)
      shift
REPO="$1"
      ;;
    --q|--qu|--qui|--quie|--quiet)
      GFI_OPTS="$GFI_OPTS --quiet"
      ;;
    --force)
      # pass --force to git-fast-import and hg-fast-export.py
      GFI_OPTS="$GFI_OPTS --force"
      break
      ;;
    -*)
      # pass any other options down to hg2git.py
      break
      ;;
    *)
      break
      ;;
  esac
shift
done

# for convenience: get default repo from state file
if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
REPO="`egrep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
  echo "Using last hg repository \"$REPO\""
fi

# make sure we have a marks cache
if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
touch "$GIT_DIR/$PFX-$SFX_MARKS"
fi

# cleanup on exit
trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0

GIT_DIR="$GIT_DIR" $PYTHON "$ROOT/hg-fast-export.py" \
  --repo "$REPO" \
  --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
  --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
  --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
  --status "$GIT_DIR/$PFX-$SFX_STATE" \
  "$@" \
| git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" || exit 1

# move recent marks cache out of the way...
if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
else
touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
fi

# ...to create a new merged one
cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
| uniq > "$GIT_DIR/$PFX-$SFX_MARKS"

# save SHA1s of current heads for incremental imports
# and connectivity (plus sanity checking)
for head in `git branch | sed 's#^..##'` ; do
id="`git rev-parse $head`"
  echo ":$head $id"
done > "$GIT_DIR/$PFX-$SFX_HEADS"

# check diff with color:
# ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r
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