archives2git

   1 #!/bin/sh
   2 # archives2git - generate a Git history from a series of release tarballs
   3 # Copyright © 2013 Géraud Meyer <graud@gmx.com>
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License version 2 as
   7 # published by the Free Software Foundation.
   8 #
   9 # This program is distributed in the hope that it will be useful, but
  10 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11 # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 # for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License along
  15 # with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 PROGRAM_NAME="archives2git"
  18 PROGRAM_VERSION="0"
  19 # Usage:
  20 #   archives2git [<options>] [--] <archives>
  21
  22 # parameters
  23 RENAME='echo "$file"' # $file $arch
  24 GIT_WORK_TREE=${GIT_WORK_TREE-.}
  25   # may be a subdir of the top level
  26 FILTER='false' # $file $arch
  27 DATE='' # $arch
  28 TITLE='echo "$arch"' # $arch
  29 BODY="" # message taken as is
  30 ADDARGS=
  31 CIARGS=
  32 FILTERHEAD= # line separated arguments
  33 while [ $# -gt 0 ]
  34 do
  35         case $1 in
  36         --rename)
  37                 shift; RENAME=$1 ;;
  38         --repo)
  39                 shift; GIT_WORK_TREE=$1 ;;
  40         --keep-filter)
  41                 shift; FILTER=$1 ;;
  42         --date)
  43                 shift; DATE=$1 ;;
  44         --title)
  45                 shift; TITLE=$1 ;;
  46         --body)
  47                 shift; BODY=$1 ;;
  48         --gitadd-arg)
  49                 shift; ADDARGS="$ADDARGS $1" ;;
  50         --gitci-arg)
  51                 shift; CIARGS="$CIARGS $1" ;;
  52         --gitfilter)
  53                 shift; FILTERHEAD=$1 ;;
  54         --version)
  55                 echo "$PROGRAM_NAME version $PROGRAM_VERSION"
  56                 exit ;;
  57         --?*)
  58                 echo "$0: unknown option $1" >&2
  59                 exit 255 ;;
  60         --)
  61                 shift; break ;;
  62         *)
  63                 break ;;
  64         esac
  65         shift
  66 done
  67 # setup
  68 NL='
  69 '
  70 TMPDIR=$(mktemp -d)
  71 WRKDIR=$(pwd)
  72 # git repository check
  73 cd "$GIT_WORK_TREE" &&
  74 { test -d .git || git rev-parse --git-dir >/dev/null; } ||
  75 {
  76         echo "$0: error not in a git repository" >&2
  77         exit 255
  78 }
  79 test -z "$(git status --porcelain)" &&
  80 git update-index -q --refresh ||
  81 {
  82         echo "$0: unstaged files or dirty index" >&2
  83         exit 254
  84 }
  85
  86 # main
  87 set -e
  88 OLDIFS=$IFS
  89 for arch
  90 do
  91         # extract the archive in a temp dir
  92         cd "$WRKDIR"
  93         aunpack -X "$TMPDIR" "$arch"
  94         # remove (almost) everything from the repository dir
  95         cd "$GIT_WORK_TREE"
  96         for file in * .*
  97         do
  98                 [ -e "$file" ] || continue
  99                 [ "$file" = "." -o "$file" = ".." -o "$file" = ".git" ] && continue
 100                 eval "$FILTER" || ( git rm -r "$file" || rm -R "$file" )
 101         done
 102         # move the content of the temp dir to the repository and stage it
 103         for file in "$TMPDIR"/* "$TMPDIR"/.*
 104         do
 105                 [ -e "$file" ] || continue
 106                 file=${file#$TMPDIR/}
 107                 [ "$file" = "." -o "$file" = ".." ] && continue
 108                 name=$(eval "$RENAME")
 109                 if [ -n "$name" ]
 110                 then
 111                         [ ! -e ./"$name" ] || rm -R ./"$name"
 112                           # remove conflicting file (previously kept or renamed to the same name)
 113                         mv "$TMPDIR"/"$file" ./"$name"
 114                         git add $ADDARGS ./"$name"
 115                 else
 116                         rm -R "$TMPDIR"/"$file"
 117                 fi
 118         done
 119         # commit, filter and clean up
 120         file=
 121         git commit -m "$(eval "$TITLE")${BODY:+$NL$BODY}" \
 122           ${DATE:+--date "$(eval "$DATE")"} $CIARGS
 123         if [ -n "$FILTERHEAD" ]
 124         then
 125                 IFS=$NL
 126                 git filter-branch $FILTERHEAD -- HEAD^..HEAD
 127                 rm -R "$(git rev-parse --git-dir)"/refs/original/
 128                 IFS=$OLDIFS
 129         fi
 130 done
 131
 132 # cleanup
 133 rmdir "$TMPDIR"