hg-fast-export.sh

#!/bin/sh

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

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

USAGE="[--quiet] [-r <repo>] [--force] [-m <max>] [-s] [--hgtags] [-A <file>] [-M <name>] [-o <name>] [--hg-hash] [-e <encoding>] [--ignore-subrepos]"
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:
	--quiet   Passed to git-fast-import(1)
	-r <repo> Mercurial repository to import
	--force   Ignore validation errors when converting, and pass --force
	          to git-fast-import(1)
	-m <max>  Maximum revision to import
	-s        Enable parsing Signed-off-by lines
	--hgtags  Enable exporting .hgtags files
	-A <file> Read author map from file
	          (Same as in git-svnimport(1) and git-cvsimport(1))
	-M <name> Set the default branch name (defaults to 'master')
	-o <name> Use <name> as branch namespace to track upstream (eg 'origin')
	--hg-hash Annotate commits with the hg hash as git notes in the
                  hg namespace.
	-e <encoding> Assume commit and author strings retrieved from
	              Mercurial are encoded in <encoding>
	--ignore-subrepos   Ignore sub repositories, and pass --force
	          to hg-fast-export(1)
"
case "$1" in
    -h|--help)
      echo "usage: $(basename "$0") $USAGE"
      echo ""
      echo "$LONG_USAGE"
      exit 0
esac
. "$(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="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
  echo "Using last hg repository \"$REPO\""
fi

if [  -z "$REPO" ]; then
    echo "no repo given, use -r flag"
    exit 1
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

_err1=
_err2=
exec 3>&1
{ read -r _err1 || :; read -r _err2 || :; } <<-EOT
$(
  exec 4>&3 3>&1 1>&4 4>&-
  {
    _e1=0
    GIT_DIR="$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-$SFX_STATE" \
      "$@" 3>&- || _e1=$?
    echo $_e1 >&3
  } | \
  {
    _e2=0
    git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
    echo $_e2 >&3
  }
)
EOT
exec 3>&-
[ "$_err1" = 0 -a "$_err2" = 0 ] || 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 refs/heads/$head`"
  echo ":$head $id"
done > "$GIT_DIR/$PFX-$SFX_HEADS"

# create mapping file from hg revision to git revision
sed 's/^://g' .git/hg2git-mapping | awk '{print ":"$2" "$1}' | sort | sed 's/[0-9]* //g' > .git/mappingsTemp
sort .git/hg2git-marks | sed 's/^:[0-9]* //g' > .git/marksTemp
paste -d ' ' .git/mappingsTemp .git/marksTemp > $GIT_DIR/$PFX-revisions
rm  .git/mappingsTemp .git/marksTemp

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

echo
echo "Checkout your repo using"
echo "git checkout HEAD"
echo
echo "If this repository contains submodules, then initialize and update the submodules with the following commands."
echo "git submodule init"
echo "git submodule update"