git-applypatch.sh

   1 #!/bin/sh
   2 ##
   3 ## applypatch takes four file arguments, and uses those to
   4 ## apply the unpacked patch (surprise surprise) that they
   5 ## represent to the current tree.
   6 ##
   7 ## The arguments are:
   8 ##      $1 - file with commit message
   9 ##      $2 - file with the actual patch
  10 ##      $3 - "info" file with Author, email and subject
  11 ##      $4 - optional file containing signoff to add
  12 ##
  13
  14 USAGE='<msg> <patch> <info> [<signoff>]'
  15 . git-sh-setup
  16
  17 case "$#" in 3|4) ;; *) usage ;; esac
  18
  19 final=.dotest/final-commit
  20 ##
  21 ## If this file exists, we ask before applying
  22 ##
  23 query_apply=.dotest/.query_apply
  24
  25 ## We do not munge the first line of the commit message too much
  26 ## if this file exists.
  27 keep_subject=.dotest/.keep_subject
  28
  29 ## We do not attempt the 3-way merge fallback unless this file exists.
  30 fall_back_3way=.dotest/.3way
  31
  32 MSGFILE=$1
  33 PATCHFILE=$2
  34 INFO=$3
  35 SIGNOFF=$4
  36 EDIT=${VISUAL:-${EDITOR:-vi}}
  37
  38 export GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' "$INFO")"
  39 export GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' "$INFO")"
  40 export GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' "$INFO")"
  41 export SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' "$INFO")"
  42
  43 if test '' != "$SIGNOFF"
  44 then
  45         if test -f "$SIGNOFF"
  46         then
  47                 SIGNOFF=`cat "$SIGNOFF"` || exit
  48         elif case "$SIGNOFF" in yes | true | me | please) : ;; *) false ;; esac
  49         then
  50                 SIGNOFF=`git-var GIT_COMMITTER_IDENT | sed -e '
  51                                 s/>.*/>/
  52                                 s/^/Signed-off-by: /'
  53                 `
  54         else
  55                 SIGNOFF=
  56         fi
  57         if test '' != "$SIGNOFF"
  58         then
  59                 LAST_SIGNED_OFF_BY=`
  60                         sed -ne '/^Signed-off-by: /p' "$MSGFILE" |
  61                         tail -n 1
  62                 `
  63                 test "$LAST_SIGNED_OFF_BY" = "$SIGNOFF" || {
  64                     test '' = "$LAST_SIGNED_OFF_BY" && echo
  65                     echo "$SIGNOFF"
  66                 } >>"$MSGFILE"
  67         fi
  68 fi
  69
  70 patch_header=
  71 test -f "$keep_subject" || patch_header='[PATCH] '
  72
  73 {
  74         echo "$patch_header$SUBJECT"
  75         if test -s "$MSGFILE"
  76         then
  77                 echo
  78                 cat "$MSGFILE"
  79         fi
  80 } >"$final"
  81
  82 interactive=yes
  83 test -f "$query_apply" || interactive=no
  84
  85 while [ "$interactive" = yes ]; do
  86         echo "Commit Body is:"
  87         echo "--------------------------"
  88         cat "$final"
  89         echo "--------------------------"
  90         printf "Apply? [y]es/[n]o/[e]dit/[a]ccept all "
  91         read reply
  92         case "$reply" in
  93                 y|Y) interactive=no;;
  94                 n|N) exit 2;;   # special value to tell dotest to keep going
  95                 e|E) "$EDIT" "$final";;
  96                 a|A) rm -f "$query_apply"
  97                      interactive=no ;;
  98         esac
  99 done
 100
 101 if test -x "$GIT_DIR"/hooks/applypatch-msg
 102 then
 103         "$GIT_DIR"/hooks/applypatch-msg "$final" || exit
 104 fi
 105
 106 echo
 107 echo Applying "'$SUBJECT'"
 108 echo
 109
 110 git-apply --index "$PATCHFILE" || {
 111
 112         # git-apply exits with status 1 when the patch does not apply,
 113         # but it die()s with other failures, most notably upon corrupt
 114         # patch.  In the latter case, there is no point to try applying
 115         # it to another tree and do 3-way merge.
 116         test $? = 1 || exit 1
 117
 118         test -f "$fall_back_3way" || exit 1
 119
 120         # Here if we know which revision the patch applies to,
 121         # we create a temporary working tree and index, apply the
 122         # patch, and attempt 3-way merge with the resulting tree.
 123
 124         O_OBJECT=`cd "$GIT_OBJECT_DIRECTORY" && pwd`
 125         rm -fr .patch-merge-*
 126
 127         if git-apply -z --index-info "$PATCHFILE" \
 128                 >.patch-merge-index-info 2>/dev/null &&
 129                 GIT_INDEX_FILE=.patch-merge-tmp-index \
 130                 git-update-index -z --index-info <.patch-merge-index-info &&
 131                 GIT_INDEX_FILE=.patch-merge-tmp-index \
 132                 git-write-tree >.patch-merge-tmp-base &&
 133                 (
 134                         mkdir .patch-merge-tmp-dir &&
 135                         cd .patch-merge-tmp-dir &&
 136                         GIT_INDEX_FILE="../.patch-merge-tmp-index" \
 137                         GIT_OBJECT_DIRECTORY="$O_OBJECT" \
 138                         git-apply $binary --index
 139                 ) <"$PATCHFILE"
 140         then
 141                 echo Using index info to reconstruct a base tree...
 142                 mv .patch-merge-tmp-base .patch-merge-base
 143                 mv .patch-merge-tmp-index .patch-merge-index
 144         else
 145         (
 146                 N=10
 147
 148                 # Otherwise, try nearby trees that can be used to apply the
 149                 # patch.
 150                 git-rev-list --max-count=$N HEAD
 151
 152                 # or hoping the patch is against known tags...
 153                 git-ls-remote --tags .
 154         ) |
 155             while read base junk
 156             do
 157                 # Try it if we have it as a tree.
 158                 git-cat-file tree "$base" >/dev/null 2>&1 || continue
 159
 160                 rm -fr .patch-merge-tmp-* &&
 161                 mkdir .patch-merge-tmp-dir || break
 162                 (
 163                         cd .patch-merge-tmp-dir &&
 164                         GIT_INDEX_FILE=../.patch-merge-tmp-index &&
 165                         GIT_OBJECT_DIRECTORY="$O_OBJECT" &&
 166                         export GIT_INDEX_FILE GIT_OBJECT_DIRECTORY &&
 167                         git-read-tree "$base" &&
 168                         git-apply --index &&
 169                         mv ../.patch-merge-tmp-index ../.patch-merge-index &&
 170                         echo "$base" >../.patch-merge-base
 171                 ) <"$PATCHFILE"  2>/dev/null && break
 172             done
 173         fi
 174
 175         test -f .patch-merge-index &&
 176         his_tree=$(GIT_INDEX_FILE=.patch-merge-index git-write-tree) &&
 177         orig_tree=$(cat .patch-merge-base) &&
 178         rm -fr .patch-merge-* || exit 1
 179
 180         echo Falling back to patching base and 3-way merge using $orig_tree...
 181
 182         # This is not so wrong.  Depending on which base we picked,
 183         # orig_tree may be wildly different from ours, but his_tree
 184         # has the same set of wildly different changes in parts the
 185         # patch did not touch, so resolve ends up cancelling them,
 186         # saying that we reverted all those changes.
 187
 188         if git-merge-resolve $orig_tree -- HEAD $his_tree
 189         then
 190                 echo Done.
 191         else
 192                 echo Failed to merge in the changes.
 193                 exit 1
 194         fi
 195 }
 196
 197 if test -x "$GIT_DIR"/hooks/pre-applypatch
 198 then
 199         "$GIT_DIR"/hooks/pre-applypatch || exit
 200 fi
 201
 202 tree=$(git-write-tree) || exit 1
 203 echo Wrote tree $tree
 204 parent=$(git-rev-parse --verify HEAD) &&
 205 commit=$(git-commit-tree $tree -p $parent <"$final") || exit 1
 206 echo Committed: $commit
 207 git-update-ref HEAD $commit $parent || exit
 208
 209 if test -x "$GIT_DIR"/hooks/post-applypatch
 210 then
 211         "$GIT_DIR"/hooks/post-applypatch
 212 fi