git-apply-patch-script

   1 #!/bin/sh
   2 # Copyright (C) 2005 Junio C Hamano
   3 #
   4 # Applying diff between two trees to the work tree can be
   5 # done with the following single command:
   6 #
   7 # GIT_EXTERNAL_DIFF=git-apply-patch-script git-diff-tree -p $tree1 $tree2
   8 #
   9
  10 case "$#" in
  11 1)
  12     echo >&2 "cannot handle unmerged diff on path $1."
  13     exit 1 ;;
  14 8)
  15     echo >&2 "cannot handle rename diff between $1 and $8 yet."
  16     exit 1 ;;
  17 esac
  18 name="$1" tmp1="$2" hex1="$3" mode1="$4" tmp2="$5" hex2="$6" mode2="$7"
  19
  20 type1=f
  21 case "$mode1" in
  22 *120???) type1=l  ;;
  23 *1007??) mode1=+x ;;
  24 *1006??) mode1=-x ;;
  25 .)       type1=-  ;;
  26 esac
  27
  28 type2=f
  29 case "$mode2" in
  30 *120???) type2=l  ;;
  31 *1007??) mode2=+x ;;
  32 *1006??) mode2=-x ;;
  33 .)       type2=-  ;;
  34 esac
  35
  36 case "$type1,$type2" in
  37
  38 -,?)
  39     dir=$(dirname "$name")
  40     case "$dir" in '' | .) ;; *) mkdir -p "$dir" ;; esac || {
  41         echo >&2 "cannot create leading path for $name."
  42         exit 1
  43     }
  44     if test -e "$name"
  45     then
  46         echo >&2 "path $name to be created already exists."
  47         exit 1
  48     fi
  49     case "$type2" in
  50     f)
  51         # creating a regular file
  52         cat "$tmp2" >"$name" || {
  53             echo >&2 "cannot create a regular file $name."
  54             exit 1
  55         }
  56         case "$mode2" in
  57         +x)
  58             echo >&2 "created a regular file $name with mode +x."
  59             chmod "$mode2" "$name"
  60             ;;
  61         -x)
  62             echo >&2 "created a regular file $name."
  63             ;;
  64         esac
  65         ;;
  66     l)
  67         # creating a symlink
  68         ln -s "$(cat "$tmp2")" "$name" || {
  69             echo >&2 "cannot create a symbolic link $name."
  70             exit 1
  71         }
  72         echo >&2 "created a symbolic link $name."
  73         ;;
  74     *)
  75         echo >&2 "do not know how to create $name of type $type2."
  76         exit 1
  77     esac
  78     git-update-cache --add -- "$name" ;;
  79
  80 ?,-)
  81     rm -f "$name" || {
  82         echo >&2 "cannot remove $name"
  83         exit 1
  84     }
  85     echo >&2 "deleted $name."
  86     git-update-cache --remove -- "$name" ;;
  87
  88 l,f|f,l)
  89     echo >&2 "cannot change a regular file $name and a symbolic link $name."
  90     exit 1 ;;
  91
  92 l,l)
  93     # symlink to symlink
  94     current=$(readlink "$name") || {
  95         echo >&2 "cannot read the target of the symbolic link $name."
  96         exit 1
  97     }
  98     original=$(cat "$tmp1")
  99     next=$(cat "$tmp2")
 100     test "$original" != "$current" || {
 101         echo >&2 "cannot apply symbolic link target change ($original->$next) to $name which points to $current."
 102         exit 1
 103     }
 104     if test "$next" != "$current"
 105     then
 106         rm -f "$name" && ln -s "$next" "$name" || {
 107             echo >&2 "cannot create symbolic link $name."
 108             exit 1
 109         }
 110         echo >&2 "changed symbolic target of $name."
 111         git-update-cache -- "$name"
 112     fi ;;
 113
 114 f,f)
 115     # changed
 116     test -e "$name" || {
 117         echo >&2 "regular file $name to be patched does not exist."
 118         exit 1
 119     }
 120     dir=$(dirname "$name")
 121     case "$dir" in '' | .) ;; *) mkdir -p "$dir";; esac || {
 122         echo >&2 "cannot create leading path for $name."
 123         exit 1
 124     }
 125     tmp=.git-apply-patch-$$
 126     trap "rm -f $tmp-*" 0 1 2 3 15
 127
 128     # Be careful, in case "$tmp2" is borrowed path from the work tree
 129     # we are looking at...
 130     diff -u -L "a/$name" -L "b/$name" "$tmp1" "$tmp2" >$tmp-patch
 131
 132     # This will say "patching ..." so we do not say anything outselves.
 133     patch -p1 <$tmp-patch || exit
 134     rm -f $tmp-patch
 135     case "$mode1,$mode2" in
 136     "$mode2,$mode1") ;;
 137     *)
 138         chmod "$mode2" "$name"
 139         echo >&2 "changed mode from $mode1 to $mode2."
 140         ;;
 141     esac
 142     git-update-cache -- "$name"
 143
 144 esac