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         --plugin <plugin=init>  Add a plugin with the given init string (repeatable)
  62         --plugin-path <plugin-path> Add an additional plugin lookup path
  63 "
  64 case "$1" in
  65     -h|--help)
  66       echo "usage: $(basename "$0") $USAGE"
  67       echo ""
  68       echo "$LONG_USAGE"
  69       exit 0
  70 esac
  71
  72 IS_BARE=$(git rev-parse --is-bare-repository) \
  73     || (echo "Could not find git repo" ; exit 1)
  74 if test "z$IS_BARE" != ztrue; then
  75    # This is not a bare repo, cd to the toplevel
  76    TOPLEVEL=$(git rev-parse --show-toplevel) \
  77        || (echo "Could not find git repo toplevel" ; exit 1)
  78    cd "$TOPLEVEL" || exit 1
  79 fi
  80 GIT_DIR=$(git rev-parse --git-dir) || (echo "Could not find git repo" ; exit 1)
  81
  82
  83 IGNORECASEWARN=""
  84 IGNORECASE=`git config core.ignoreCase`
  85 if [ "true" = "$IGNORECASE" ]; then
  86     IGNORECASEWARN="true"
  87 fi;
  88
  89
  90 while case "$#" in 0) break ;; esac
  91 do
  92   case "$1" in
  93     -r|--r|--re|--rep|--repo)
  94       shift
  95       REPO="$1"
  96       ;;
  97     --q|--qu|--qui|--quie|--quiet)
  98       GFI_OPTS="$GFI_OPTS --quiet"
  99       ;;
 100     --force)
 101       # pass --force to git-fast-import and hg-fast-export.py
 102       GFI_OPTS="$GFI_OPTS --force"
 103       IGNORECASEWARN="";
 104       break
 105       ;;
 106     -*)
 107       # pass any other options down to hg2git.py
 108       break
 109       ;;
 110     *)
 111       break
 112       ;;
 113   esac
 114   shift
 115 done
 116
 117 if [ ! -z "$IGNORECASEWARN" ]; then
 118     echo "Error: The option core.ignoreCase is set to true in the git"
 119     echo "repository. This will produce empty changesets for renames that just"
 120     echo "change the case of the file name."
 121     echo "Use --force to skip this check or change the option with"
 122     echo "git config core.ignoreCase false"
 123     exit 1
 124 fi;
 125
 126 # Make a backup copy of each state file
 127 for i in $SFX_STATE $SFX_MARKS $SFX_MAPPING $SFX_HEADS ; do
 128     if [ -f "$GIT_DIR/$PFX-$i" ] ; then
 129         cp "$GIT_DIR/$PFX-$i" "$GIT_DIR/$PFX-$i~"
 130     fi
 131 done
 132
 133 # for convenience: get default repo from state file
 134 if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
 135   REPO="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
 136   echo "Using last hg repository \"$REPO\""
 137 fi
 138
 139 if [  -z "$REPO" ]; then
 140     echo "no repo given, use -r flag"
 141     exit 1
 142 fi
 143
 144 # make sure we have a marks cache
 145 if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 146   touch "$GIT_DIR/$PFX-$SFX_MARKS"
 147 fi
 148
 149 # cleanup on exit
 150 trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0
 151
 152 _err1=
 153 _err2=
 154 exec 3>&1
 155 { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 156 $(
 157   exec 4>&3 3>&1 1>&4 4>&-
 158   {
 159     _e1=0
 160     GIT_DIR="$GIT_DIR" "$PYTHON" "$ROOT/hg-fast-export.py" \
 161       --repo "$REPO" \
 162       --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
 163       --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
 164       --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
 165       --status "$GIT_DIR/$PFX-$SFX_STATE" \
 166       "$@" 3>&- || _e1=$?
 167     echo $_e1 >&3
 168   } | \
 169   {
 170     _e2=0
 171     git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
 172     echo $_e2 >&3
 173   }
 174 )
 175 EOT
 176 exec 3>&-
 177 [ "$_err1" = 0 -a "$_err2" = 0 ] || exit 1
 178
 179 # move recent marks cache out of the way...
 180 if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 181   mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
 182 else
 183   touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
 184 fi
 185
 186 # ...to create a new merged one
 187 cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
 188 | uniq > "$GIT_DIR/$PFX-$SFX_MARKS"
 189
 190 # save SHA1s of current heads for incremental imports
 191 # and connectivity (plus sanity checking)
 192 for head in `git branch | sed 's#^..##'` ; do
 193   id="`git rev-parse refs/heads/$head`"
 194   echo ":$head $id"
 195 done > "$GIT_DIR/$PFX-$SFX_HEADS"
 196
 197 # check diff with color:
 198 # ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r