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 "$file"'
  24 GIT_WORK_TREE=${GIT_WORK_TREE-.}
  25 FILTER='false $file'
  26 DATE=''
  27 TITLE='echo "$arch"'
  28 BODY=
  29 ADDARGS=
  30 CIARGS=
  31 FILTERHEAD=
  32 while [ $# -gt 0 ]
  33 do
  34         case $1 in
  35         --rename)
  36                 shift; RENAME=$1 ;;
  37         --repo)
  38                 shift; GIT_WORK_TREE=$1 ;;
  39         --keep-filter)
  40                 shift; FILTER=$1 ;;
  41         --date)
  42                 shift; DATE=$1 ;;
  43         --title)
  44                 shift; TITLE=$1 ;;
  45         --body)
  46                 shift; BODY=$1 ;;
  47         --gitadd-arg)
  48                 shift; ADDARGS="$ADDARGS $1" ;;
  49         --gitci-arg)
  50                 shift; CIARGS="$CIARGS $1" ;;
  51         --gitfilter)
  52                 shift; FILTERHEAD=$1 ;;
  53         --version)
  54                 echo "$PROGRAM_NAME version $PROGRAM_VERSION"
  55                 exit ;;
  56         --?*)
  57                 echo "$0: unknown option $1" >&2
  58                 exit 255 ;;
  59         --)
  60                 shift; break ;;
  61         *)
  62                 break ;;
  63         esac
  64         shift
  65 done
  66 # setup
  67 NL='
  68 '
  69 TMPDIR=$(mktemp -d)
  70 WRKDIR=$(pwd)
  71 # git repository check
  72 cd "$GIT_WORK_TREE" &&
  73 { test -d .git || git rev-parse --git-dir >/dev/null; } ||
  74 {
  75         echo "$0: error not in a git repository" >&2
  76         exit 255
  77 }
  78 test -z "$(git status --porcelain)" &&
  79 git update-index -q --refresh ||
  80 {
  81         echo "$0: unstaged files or dirty index" >&2
  82         exit 254
  83 }
  84
  85 # main
  86 set -e
  87 OLDIFS=$IFS
  88 for arch
  89 do
  90         cd "$WRKDIR"
  91         aunpack -X "$TMPDIR" "$arch"
  92         cd "$GIT_WORK_TREE"
  93         for file in * .*
  94         do
  95                 [ -e "$file" ] || continue
  96                 [ "$file" = "." -o "$file" = ".." -o "$file" = ".git" ] && continue
  97                 eval "$FILTER" || ( git rm -r "$file" || rm -R "$file" )
  98         done
  99         for file in "$TMPDIR"/* "$TMPDIR"/.*
 100         do
 101                 [ -e "$file" ] || continue
 102                 file=${file#$TMPDIR/}
 103                 [ "$file" = "." -o "$file" = ".." ] && continue
 104                 name=$(eval "$RENAME")
 105                 if [ -n "$name" ]
 106                 then
 107                         [ ! -e ./"$name" ] || rm -R ./"$name"
 108                         mv "$TMPDIR"/"$file" ./"$name"
 109                         git add $ADDARGS ./"$name"
 110                 else
 111                         rm -R "$TMPDIR"/"$file"
 112                 fi
 113         done
 114         git commit -m "$(eval "$TITLE")${BODY:+$NL$BODY}" \
 115           ${DATE:+--date "$(eval "$DATE")"} $CIARGS
 116         if [ -n "$FILTERHEAD" ]
 117         then
 118                 IFS=$NL
 119                 git filter-branch $FILTERHEAD -- HEAD^..HEAD
 120                 rm -R "$(git rev-parse --git-dir)"/refs/original/
 121                 IFS=$OLDIFS
 122         fi
 123 done
 124
 125 #
 126 rmdir "$TMPDIR"