.bin/git-svn

   1 #!/bin/sh
   2
   3 gdir=".git"
   4 if [ ! -d ${gdir} ] ; then
   5         echo "Run this is in the root of the git tree"
   6         exit 1
   7 fi
   8
   9 revmap() {
  10         find ${gdir}/svn/$1/ '(' -name '.rev_map.*' -a '!' -name '*.bak' ')' -print
  11 }
  12
  13 decode() {
  14         xxd -c24 < $1
  15 }
  16 encode() {
  17         xxd -c24 -r
  18 }
  19
  20 get_branch() {
  21         branch=${1:-trunk}
  22         if [ ! -d ${gdir}/svn/${branch} ] ; then
  23                 echo "Branch ${branch} not in ${gdir}/svn/"
  24                 exit 1
  25         fi
  26
  27         map=$(revmap ${branch})
  28
  29         cur_rev=$(printf '%i' 0x$(decode $map | tail -n1 | awk '{print $3}'))
  30 }
  31
  32 show() {
  33         get_branch "$@"
  34         echo "${branch}: at rev ${cur_rev}"
  35         exit 0
  36 }
  37
  38 reset() {
  39         get_branch "$@"
  40         new_rev=$2
  41         if [ -z "$new_rev" ] || [ "$new_rev" -gt "$cur_rev" ] ; then
  42                 echo "${branch}: invalid rev '$new_rev' (at $cur_rev)"
  43                 exit 1
  44         fi
  45
  46         printf "really reset $branch to $new_rev ? [y/N] "
  47         read ans
  48         case ${ans} in
  49                 [yY]) ;;
  50                 *) exit 1;;
  51         esac
  52
  53         hex0=$(printf '%04x' $(( new_rev % 0x10000 )) )
  54         hex1=$(printf '%04x' $(( new_rev / 0x10000 )) )
  55         cp $map $map.bak
  56         decode $map.bak \
  57                 | sed -n "1,/^[^:]*: $hex1 $hex0/p" \
  58                 | encode \
  59                 > $map
  60
  61         show ${branch}
  62         echo "don't forget to reset manually ref/remotes/${branch}"
  63 }
  64
  65 usage() {
  66         echo "Unknown op '$op'"
  67         exit 1
  68 }
  69
  70 branch=
  71 op=$1
  72 shift
  73 case $op in
  74         -s) show "$@";;
  75         -r) reset "$@";;
  76         *) usage;;
  77 esac