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:-python}
  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 "
  60 case "$1" in
  61     -h|--help)
  62       echo "usage: $(basename "$0") $USAGE"
  63       echo ""
  64       echo "$LONG_USAGE"
  65       exit 0
  66 esac
  67
  68 IS_BARE=$(git rev-parse --is-bare-repository) \
  69     || (echo "Could not find git repo" ; exit 1)
  70 if test "z$IS_BARE" != ztrue; then
  71    # This is not a bare repo, cd to the toplevel
  72    TOPLEVEL=$(git rev-parse --show-toplevel) \
  73        || (echo "Could not find git repo toplevel" ; exit 1)
  74    cd "$TOPLEVEL" || exit 1
  75 fi
  76 GIT_DIR=$(git rev-parse --git-dir) || (echo "Could not find git repo" ; exit 1)
  77
  78
  79 IGNORECASEWARN=""
  80 IGNORECASE=`git config core.ignoreCase`
  81 if [ "true" = "$IGNORECASE" ]; then
  82     IGNORECASEWARN="true"
  83 fi;
  84
  85
  86 while case "$#" in 0) break ;; esac
  87 do
  88   case "$1" in
  89     -r|--r|--re|--rep|--repo)
  90       shift
  91       REPO="$1"
  92       ;;
  93     --q|--qu|--qui|--quie|--quiet)
  94       GFI_OPTS="$GFI_OPTS --quiet"
  95       ;;
  96     --force)
  97       # pass --force to git-fast-import and hg-fast-export.py
  98       GFI_OPTS="$GFI_OPTS --force"
  99       IGNORECASEWARN="";
 100       break
 101       ;;
 102     -*)
 103       # pass any other options down to hg2git.py
 104       break
 105       ;;
 106     *)
 107       break
 108       ;;
 109   esac
 110   shift
 111 done
 112
 113 if [ ! -z "$IGNORECASEWARN" ]; then
 114     echo "Error: The option core.ignoreCase is set to true in the git"
 115     echo "repository. This will produce empty changesets for renames that just"
 116     echo "change the case of the file name."
 117     echo "Use --force to skip this check or change the option with"
 118     echo "git config core.ignoreCase false"
 119     exit 1
 120 fi;
 121
 122 # Make a backup copy of each state file
 123 for i in $SFX_STATE $SFX_MARKS $SFX_MAPPING $SFX_HEADS ; do
 124     if [ -f "$GIT_DIR/$PFX-$i" ] ; then
 125         cp "$GIT_DIR/$PFX-$i" "$GIT_DIR/$PFX-$i~"
 126     fi
 127 done
 128
 129 # for convenience: get default repo from state file
 130 if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
 131   REPO="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
 132   echo "Using last hg repository \"$REPO\""
 133 fi
 134
 135 if [  -z "$REPO" ]; then
 136     echo "no repo given, use -r flag"
 137     exit 1
 138 fi
 139
 140 # make sure we have a marks cache
 141 if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 142   touch "$GIT_DIR/$PFX-$SFX_MARKS"
 143 fi
 144
 145 # cleanup on exit
 146 trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0
 147
 148 _err1=
 149 _err2=
 150 exec 3>&1
 151 { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 152 $(
 153   exec 4>&3 3>&1 1>&4 4>&-
 154   {
 155     _e1=0
 156     GIT_DIR="$GIT_DIR" "$PYTHON" "$ROOT/hg-fast-export.py" \
 157       --repo "$REPO" \
 158       --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
 159       --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
 160       --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
 161       --status "$GIT_DIR/$PFX-$SFX_STATE" \
 162       "$@" 3>&- || _e1=$?
 163     echo $_e1 >&3
 164   } | \
 165   {
 166     _e2=0
 167     git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
 168     echo $_e2 >&3
 169   }
 170 )
 171 EOT
 172 exec 3>&-
 173 [ "$_err1" = 0 -a "$_err2" = 0 ] || exit 1
 174
 175 # move recent marks cache out of the way...
 176 if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 177   mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
 178 else
 179   touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
 180 fi
 181
 182 # ...to create a new merged one
 183 cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
 184 | uniq > "$GIT_DIR/$PFX-$SFX_MARKS"
 185
 186 # save SHA1s of current heads for incremental imports
 187 # and connectivity (plus sanity checking)
 188 for head in `git branch | sed 's#^..##'` ; do
 189   id="`git rev-parse refs/heads/$head`"
 190   echo ":$head $id"
 191 done > "$GIT_DIR/$PFX-$SFX_HEADS"
 192
 193 # check diff with color:
 194 # ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r