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 "$0")")")"
  20 fi
  21
  22 REPO=""
  23 PFX="hg2git"
  24 SFX_MAPPING="mapping"
  25 SFX_MARKS="marks"
  26 SFX_HEADS="heads"
  27 SFX_STATE="state"
  28 GFI_OPTS=""
  29
  30 if [ -z "${PYTHON}" ]; then
  31     # $PYTHON is not set, so we try to find a working python with mercurial:
  32     for python_cmd in python2 python python3; do
  33         if command -v $python_cmd > /dev/null; then
  34             $python_cmd -c 'from mercurial.scmutil import revsymbol' 2> /dev/null
  35             if [ $? -eq 0 ]; then
  36                 PYTHON=$python_cmd
  37                 break
  38             fi
  39         fi
  40     done
  41 fi
  42 if [ -z "${PYTHON}" ]; then
  43     echo "Could not find a python interpreter with the mercurial module >= 4.6 available. " \
  44         "Please use the 'PYTHON' environment variable to specify the interpreter to use."
  45     exit 1
  46 fi
  47
  48 USAGE="[--quiet] [-r <repo>] [--force] [-m <max>] [-s] [--hgtags] [-A <file>] [-B <file>] [-T <file>] [-M <name>] [-o <name>] [--hg-hash] [-e <encoding>]"
  49 LONG_USAGE="Import hg repository <repo> up to either tip or <max>
  50 If <repo> is omitted, use last hg repository as obtained from state file,
  51 GIT_DIR/$PFX-$SFX_STATE by default.
  52
  53 Note: The argument order matters.
  54
  55 Options:
  56         --quiet   Passed to git-fast-import(1)
  57         -r <repo> Mercurial repository to import
  58         --force   Ignore validation errors when converting, and pass --force
  59                   to git-fast-import(1)
  60         -m <max>  Maximum revision to import
  61         -s        Enable parsing Signed-off-by lines
  62         --hgtags  Enable exporting .hgtags files
  63         -A <file> Read author map from file
  64                   (Same as in git-svnimport(1) and git-cvsimport(1))
  65         -B <file> Read branch map from file
  66         -T <file> Read tags map from file
  67         -M <name> Set the default branch name (defaults to 'master')
  68         -n        Do not perform built-in (broken in many cases) sanitizing
  69                   of branch/tag names.
  70         -o <name> Use <name> as branch namespace to track upstream (eg 'origin')
  71         --hg-hash Annotate commits with the hg hash as git notes in the
  72                   hg namespace.
  73         -e <encoding> Assume commit and author strings retrieved from
  74                       Mercurial are encoded in <encoding>
  75         --fe <filename_encoding> Assume filenames from Mercurial are encoded
  76                                  in <filename_encoding>
  77         --mappings-are-raw Assume mappings are raw <key>=<value> lines
  78         --filter-contents <cmd>  Pipe contents of each exported file through <cmd>
  79                                  with <file-path> <hg-hash> <is-binary> as arguments
  80         --plugin <plugin=init>  Add a plugin with the given init string (repeatable)
  81         --plugin-path <plugin-path> Add an additional plugin lookup path
  82 "
  83 case "$1" in
  84     -h|--help)
  85       echo "usage: $(basename "$0") $USAGE"
  86       echo ""
  87       echo "$LONG_USAGE"
  88       exit 0
  89 esac
  90
  91 IS_BARE=$(git rev-parse --is-bare-repository) \
  92     || (echo "Could not find git repo" ; exit 1)
  93 if test "z$IS_BARE" != ztrue; then
  94    # This is not a bare repo, cd to the toplevel
  95    TOPLEVEL=$(git rev-parse --show-toplevel) \
  96        || (echo "Could not find git repo toplevel" ; exit 1)
  97    cd "$TOPLEVEL" || exit 1
  98 fi
  99 GIT_DIR=$(git rev-parse --git-dir) || (echo "Could not find git repo" ; exit 1)
 100
 101
 102 IGNORECASEWARN=""
 103 IGNORECASE=`git config core.ignoreCase`
 104 if [ "true" = "$IGNORECASE" ]; then
 105     IGNORECASEWARN="true"
 106 fi;
 107
 108
 109 while case "$#" in 0) break ;; esac
 110 do
 111   case "$1" in
 112     -r|--r|--re|--rep|--repo)
 113       shift
 114       REPO="$1"
 115       ;;
 116     --q|--qu|--qui|--quie|--quiet)
 117       GFI_OPTS="$GFI_OPTS --quiet"
 118       ;;
 119     --force)
 120       # pass --force to git-fast-import and hg-fast-export.py
 121       GFI_OPTS="$GFI_OPTS --force"
 122       IGNORECASEWARN="";
 123       break
 124       ;;
 125     -*)
 126       # pass any other options down to hg2git.py
 127       break
 128       ;;
 129     *)
 130       break
 131       ;;
 132   esac
 133   shift
 134 done
 135
 136 if [ ! -z "$IGNORECASEWARN" ]; then
 137     echo "Error: The option core.ignoreCase is set to true in the git"
 138     echo "repository. This will produce empty changesets for renames that just"
 139     echo "change the case of the file name."
 140     echo "Use --force to skip this check or change the option with"
 141     echo "git config core.ignoreCase false"
 142     exit 1
 143 fi;
 144
 145 # Make a backup copy of each state file
 146 for i in $SFX_STATE $SFX_MARKS $SFX_MAPPING $SFX_HEADS ; do
 147     if [ -f "$GIT_DIR/$PFX-$i" ] ; then
 148         cp "$GIT_DIR/$PFX-$i" "$GIT_DIR/$PFX-$i~"
 149     fi
 150 done
 151
 152 # for convenience: get default repo from state file
 153 if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
 154   REPO="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
 155   echo "Using last hg repository \"$REPO\""
 156 fi
 157
 158 if [  -z "$REPO" ]; then
 159     echo "no repo given, use -r flag"
 160     exit 1
 161 fi
 162
 163 # make sure we have a marks cache
 164 if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 165   touch "$GIT_DIR/$PFX-$SFX_MARKS"
 166 fi
 167
 168 # cleanup on exit
 169 trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0
 170
 171 _err1=
 172 _err2=
 173 exec 3>&1
 174 { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 175 $(
 176   exec 4>&3 3>&1 1>&4 4>&-
 177   {
 178     _e1=0
 179     GIT_DIR="$GIT_DIR" "$PYTHON" "$ROOT/hg-fast-export.py" \
 180       --repo "$REPO" \
 181       --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
 182       --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
 183       --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
 184       --status "$GIT_DIR/$PFX-$SFX_STATE" \
 185       "$@" 3>&- || _e1=$?
 186     echo $_e1 >&3
 187   } | \
 188   {
 189     _e2=0
 190     git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
 191     echo $_e2 >&3
 192   }
 193 )
 194 EOT
 195 exec 3>&-
 196 [ "$_err1" = 0 -a "$_err2" = 0 ] || exit 1
 197
 198 # move recent marks cache out of the way...
 199 if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 200   mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
 201 else
 202   touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
 203 fi
 204
 205 # ...to create a new merged one
 206 cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
 207 | uniq > "$GIT_DIR/$PFX-$SFX_MARKS"
 208
 209 # save SHA1s of current heads for incremental imports
 210 # and connectivity (plus sanity checking)
 211 for head in `git branch | sed 's#^..##'` ; do
 212   id="`git rev-parse refs/heads/$head`"
 213   echo ":$head $id"
 214 done > "$GIT_DIR/$PFX-$SFX_HEADS"
 215
 216 # check diff with color:
 217 # ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r