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