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 python3 python; 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 "${PYTHON}" ]; then
  43     echo "Could not find a python interpreter with the mercurial module >= 4.6 available. " \
  44         "Please use the 'PYTHON' environment variable to specify the interpreter to use."
  45     exit 1
  46 fi
  47
  48 "${PYTHON}" -c 'import sys; exit(sys.version_info.major==3 and sys.version_info.minor >= 7)'
  49
  50 if [ $? -eq 0 ]; then
  51     echo "Could not find an interpreter for a supported Python version (>= 3.7)" \
  52         "Please use the 'PYTHON' environment variable to specify the interpreter to use."
  53     exit 1
  54 fi
  55
  56 USAGE="[--quiet] [-r <repo>] [--force] [--ignore-unnamed-heads] [-m <max>] [-s] [--hgtags] [-A <file>] [-B <file>] [-T <file>] [-M <name>] [-o <name>] [--hg-hash] [-e <encoding>]"
  57 LONG_USAGE="Import hg repository <repo> up to either tip or <max>
  58 If <repo> is omitted, use last hg repository as obtained from state file,
  59 GIT_DIR/$PFX-$SFX_STATE by default.
  60
  61 Note: The argument order matters.
  62
  63 Options:
  64         --quiet   Passed to git-fast-import(1)
  65         -r <repo> Mercurial repository to import
  66         --force   Ignore validation errors when converting, and pass --force
  67                   to git-fast-import(1)
  68         -m <max>  Maximum revision to import
  69         -s        Enable parsing Signed-off-by lines
  70         --hgtags  Enable exporting .hgtags files
  71         -A <file> Read author map from file
  72                   (Same as in git-svnimport(1) and git-cvsimport(1))
  73         -B <file> Read branch map from file
  74         -T <file> Read tags map from file
  75         -M <name> Set the default branch name (defaults to 'master')
  76         -n        Do not perform built-in (broken in many cases) sanitizing
  77                   of branch/tag names.
  78         -o <name> Use <name> as branch namespace to track upstream (eg 'origin')
  79         --hg-hash Annotate commits with the hg hash as git notes in the
  80                   hg namespace.
  81         -e <encoding> Assume commit and author strings retrieved from
  82                       Mercurial are encoded in <encoding>
  83         --fe <filename_encoding> Assume filenames from Mercurial are encoded
  84                                  in <filename_encoding>
  85         --mappings-are-raw Assume mappings are raw <key>=<value> lines
  86         --filter-contents <cmd>  Pipe contents of each exported file through <cmd>
  87                                  with <file-path> <hg-hash> <is-binary> as arguments
  88         --plugin <plugin=init>  Add a plugin with the given init string (repeatable)
  89         --plugin-path <plugin-path> Add an additional plugin lookup path
  90 "
  91 case "$1" in
  92     -h|--help)
  93       echo "usage: $(basename "$0") $USAGE"
  94       echo ""
  95       echo "$LONG_USAGE"
  96       exit 0
  97       ;;
  98
  99     --debug)
 100       echo -n "Using Python: "
 101       "${PYTHON}" --version
 102       echo -n "Using Mercurial: "
 103       hg --version
 104       exit 0
 105 esac
 106
 107 IS_BARE=$(git rev-parse --is-bare-repository) \
 108     || (echo "Could not find git repo" ; exit 1)
 109 if test "z$IS_BARE" != ztrue; then
 110    # This is not a bare repo, cd to the toplevel
 111    TOPLEVEL=$(git rev-parse --show-toplevel) \
 112        || (echo "Could not find git repo toplevel" ; exit 1)
 113    cd "$TOPLEVEL" || exit 1
 114 fi
 115 GIT_DIR=$(git rev-parse --git-dir) || (echo "Could not find git repo" ; exit 1)
 116
 117
 118 IGNORECASEWARN=""
 119 IGNORECASE=`git config core.ignoreCase`
 120 if [ "true" = "$IGNORECASE" ]; then
 121     IGNORECASEWARN="true"
 122 fi;
 123
 124
 125 while case "$#" in 0) break ;; esac
 126 do
 127   case "$1" in
 128     -r|--r|--re|--rep|--repo)
 129       shift
 130       REPO="$1"
 131       ;;
 132     --q|--qu|--qui|--quie|--quiet)
 133       GFI_OPTS="$GFI_OPTS --quiet"
 134       ;;
 135     --force)
 136       # pass --force to git-fast-import and hg-fast-export.py
 137       GFI_OPTS="$GFI_OPTS --force"
 138       IGNORECASEWARN="";
 139       break
 140       ;;
 141     -*)
 142       # pass any other options down to hg2git.py
 143       break
 144       ;;
 145     *)
 146       break
 147       ;;
 148   esac
 149   shift
 150 done
 151
 152 if [ ! -z "$IGNORECASEWARN" ]; then
 153     echo "Error: The option core.ignoreCase is set to true in the git"
 154     echo "repository. This will produce empty changesets for renames that just"
 155     echo "change the case of the file name."
 156     echo "Use --force to skip this check or change the option with"
 157     echo "git config core.ignoreCase false"
 158     exit 1
 159 fi;
 160
 161 # Make a backup copy of each state file
 162 for i in $SFX_STATE $SFX_MARKS $SFX_MAPPING $SFX_HEADS ; do
 163     if [ -f "$GIT_DIR/$PFX-$i" ] ; then
 164         cp "$GIT_DIR/$PFX-$i" "$GIT_DIR/$PFX-$i~"
 165     fi
 166 done
 167
 168 # for convenience: get default repo from state file
 169 if [ x"$REPO" = x -a -f "$GIT_DIR/$PFX-$SFX_STATE" ] ; then
 170   REPO="`grep '^:repo ' "$GIT_DIR/$PFX-$SFX_STATE" | cut -d ' ' -f 2`"
 171   echo "Using last hg repository \"$REPO\""
 172 fi
 173
 174 if [  -z "$REPO" ]; then
 175     echo "no repo given, use -r flag"
 176     exit 1
 177 fi
 178
 179 # make sure we have a marks cache
 180 if [ ! -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 181   touch "$GIT_DIR/$PFX-$SFX_MARKS"
 182 fi
 183
 184 # cleanup on exit
 185 trap 'rm -f "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"' 0
 186
 187 _err1=
 188 _err2=
 189 exec 3>&1
 190 { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 191 $(
 192   exec 4>&3 3>&1 1>&4 4>&-
 193   {
 194     _e1=0
 195     GIT_DIR="$GIT_DIR" "$PYTHON" "$ROOT/hg-fast-export.py" \
 196       --repo "$REPO" \
 197       --marks "$GIT_DIR/$PFX-$SFX_MARKS" \
 198       --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
 199       --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
 200       --status "$GIT_DIR/$PFX-$SFX_STATE" \
 201       "$@" 3>&- || _e1=$?
 202     echo $_e1 >&3
 203   } | \
 204   {
 205     _e2=0
 206     git fast-import $GFI_OPTS --export-marks="$GIT_DIR/$PFX-$SFX_MARKS.tmp" 3>&- || _e2=$?
 207     echo $_e2 >&3
 208   }
 209 )
 210 EOT
 211 exec 3>&-
 212 [ "$_err1" = 0 -a "$_err2" = 0 ] || exit 1
 213
 214 # move recent marks cache out of the way...
 215 if [ -f "$GIT_DIR/$PFX-$SFX_MARKS" ] ; then
 216   mv "$GIT_DIR/$PFX-$SFX_MARKS" "$GIT_DIR/$PFX-$SFX_MARKS.old"
 217 else
 218   touch "$GIT_DIR/$PFX-$SFX_MARKS.old"
 219 fi
 220
 221 # ...to create a new merged one
 222 cat "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp" \
 223 | uniq > "$GIT_DIR/$PFX-$SFX_MARKS"
 224
 225 # save SHA1s of current heads for incremental imports
 226 # and connectivity (plus sanity checking)
 227 for head in `git branch | sed 's#^..##'` ; do
 228   id="`git rev-parse refs/heads/$head`"
 229   echo ":$head $id"
 230 done > "$GIT_DIR/$PFX-$SFX_HEADS"
 231
 232 # check diff with color:
 233 # ( for i in `find . -type f | grep -v '\.git'` ; do diff -u $i $REPO/$i ; done | cdiff ) | less -r