hg-fast-export.sh

   1 #!/bin/sh
   2
   3 # Copyright (c) 2007, 2008 Rocco Rutte <pdmef@gmx.net> and others.
   4 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
   5
   6 READLINK="readlink"
   7 if command -v greadlink > /dev/null; then
   8   READLINK="greadlink" # Prefer greadlink over readlink
   9 fi
  10
  11 if ! $READLINK -f "$(which "$0")" > /dev/null 2>&1 ; then
  12     ROOT="$(dirname "$(which "$0")")"
  13     if [ ! -f "$ROOT/hg-fast-export.py" ] ; then
  14         echo "hg-fast-exports requires a readlink implementation which knows" \
  15              " how to canonicalize paths in order to be called via a symlink."
  16         exit 1
  17     fi
  18 else
  19     ROOT="$(dirname "$($READLINK -f "$(which "$0")")")"
  20 fi
  21
  22 REPO=""
  23 PFX="hg2git"
  24 SFX_MAPPING="mapping"
  25 SFX_MARKS="marks"
  26 SFX_HEADS="heads"
  27 SFX_STATE="state"
  28 GFI_OPTS=""
  29 PYTHON=${PYTHON:-python2}
  30
  31 USAGE="[--quiet] [-r <repo>] [--force] [-m <max>] [-s] [--hgtags] [-A <file>] [-B <file>] [-T <file>] [-M <name>] [-o <name>] [--hg-hash] [-e <encoding>]"
  32 LONG_USAGE="Import hg repository <repo> up to either tip or <max>
  33 If <repo> is omitted, use last hg repository as obtained from state file,
  34 GIT_DIR/$PFX-$SFX_STATE by default.
  35
  36 Note: The argument order matters.
  37
  38 Options:
  39         --quiet   Passed to git-fast-import(1)
  40         -r <repo> Mercurial repository to import
  41         --force   Ignore validation errors when converting, and pass --force
  42                   to git-fast-import(1)
  43         -m <max>  Maximum revision to import
  44         -s        Enable parsing Signed-off-by lines
  45         --hgtags  Enable exporting .hgtags files
  46         -A <file> Read author map from file
  47                   (Same as in git-svnimport(1) and git-cvsimport(1))
  48         -B <file> Read branch map from file
  49         -T <file> Read tags map from file
  50         -M <name> Set the default branch name (defaults to 'master')
  51         -o <name> Use <name> as branch namespace to track upstream (eg 'origin')
  52         --hg-hash Annotate commits with the hg hash as git notes in the
  53                   hg namespace.
  54         -e <encoding> Assume commit and author strings retrieved from
  55                       Mercurial are encoded in <encoding>
  56         --fe <filename_encoding> Assume filenames from Mercurial are encoded
  57                                  in <filename_encoding>
  58         --mappings-are-raw Assume mappings are raw <key>=<value> lines
  59         --filter-contents <cmd>  Pipe contents of each exported file through <cmd>
  60                                  with <file-path> <hg-hash> <is-binary> as arguments
  61 "
  62 case "$1" in
  63     -h|--help)
  64       echo "usage: $(basename "$0") $USAGE"
  65       echo ""
  66       echo "$LONG_USAGE"
  67       exit 0
  68 esac
  69
  70 IS_BARE=$(git rev-parse --is-bare-repository) \
  71     || (echo "Could not find git repo" ; exit 1)
  72 if test "z$IS_BARE" != ztrue; then
  73    # This is not a bare repo, cd to the toplevel
  74    TOPLEVEL=$(git rev-parse --show-toplevel) \
  75        || (echo "Could not find git repo toplevel" ; exit 1)
  76    cd "$TOPLEVEL" || exit 1
  77 fi
  78 GIT_DIR=$(git rev-parse --git-dir) || (echo "Could not find git repo" ; exit 1)
  79
  80
  81 IGNORECASEWARN=""
  82 IGNORECASE=`git config core.ignoreCase`
  83 if [ "true" = "$IGNORECASE" ]; then
  84     IGNORECASEWARN="true"
  85 fi;
  86
  87
  88 while case "$#" in 0) break ;; esac
  89 do
  90   case "$1" in
  91     -r|--r|--re|--rep|--repo)
  92       shift
  93       REPO="$1"
  94       ;;
  95     --q|--qu|--qui|--quie|--quiet)
  96       GFI_OPTS="$GFI_OPTS --quiet"
  97       ;;
  98     --force)
  99       # pass --force to git-fast-import and hg-fast-export.py
 100       GFI_OPTS="$GFI_OPTS --force"
 101       IGNORECASEWARN="";
 102       break
 103       ;;
 104     -*)
 105       # pass any other options down to hg2git.py
 106       break
 107       ;;
 108     *)
 109       break
 110       ;;
 111   esac
 112   shift
 113 done
 114
 115 if [ ! -z "$IGNORECASEWARN" ]; then
 116     echo "Error: The option core.ignoreCase is set to true in the git"
 117     echo "repository. This will produce empty changesets for renames that just"
 118     echo "change the case of the file name."
 119     echo "Use --force to skip this check or change the option with"
 120     echo "git config core.ignoreCase false"
 121     exit 1
 122 fi;
 123
 124 # Make a backup copy of each state file
 125 for i in $SFX_STATE $SFX_MARKS $SFX_MAPPING $SFX_HEADS ; do
 126     if [ -f "$GIT_DIR/$PFX-$i" ] ; then
 127         cp "$GIT_DIR/$PFX-$i" "$GIT_DIR/$PFX-$i~"
 128     fi
 129 done
 130
 131 # for convenience: get default repo from state file
 132 if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
 133   REPO="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
 134   echo "Using last hg repository \"$REPO\""
 135 fi
 136
 137 if [  -z "$REPO" ]; then
 138     echo "no repo given, use -r flag"
 139     exit 1
 140 fi
 141
 142 # make sure we have a marks cache
 143 if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 144   touch "$GIT_DIR/$PFX-$SFX_MARKS"
 145 fi
 146
 147 # cleanup on exit
 148 trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0
 149
 150 _err1=
 151 _err2=
 152 exec 3>&1
 153 { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 154 $(
 155   exec 4>&3 3>&1 1>&4 4>&-
 156   {
 157     _e1=0
 158     GIT_DIR="$GIT_DIR" "$PYTHON" "$ROOT/hg-fast-export.py" \
 159       --repo "$REPO" \
 160       --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
 161       --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
 162       --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
 163       --status "$GIT_DIR/$PFX-$SFX_STATE" \
 164       "$@" 3>&- || _e1=$?
 165     echo $_e1 >&3
 166   } | \
 167   {
 168     _e2=0
 169     git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
 170     echo $_e2 >&3
 171   }
 172 )
 173 EOT
 174 exec 3>&-
 175 [ "$_err1" = 0 -a "$_err2" = 0 ] || exit 1
 176
 177 # move recent marks cache out of the way...
 178 if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 179   mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
 180 else
 181   touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
 182 fi
 183
 184 # ...to create a new merged one
 185 cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
 186 | uniq > "$GIT_DIR/$PFX-$SFX_MARKS"
 187
 188 # save SHA1s of current heads for incremental imports
 189 # and connectivity (plus sanity checking)
 190 for head in `git branch | sed 's#^..##'` ; do
 191   id="`git rev-parse refs/heads/$head`"
 192   echo ":$head $id"
 193 done > "$GIT_DIR/$PFX-$SFX_HEADS"
 194
 195 # check diff with color:
 196 # ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r