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 . git-sh-setup
  14
  15 final=.dotest/final-commit
  16 ##
  17 ## If this file exists, we ask before applying
  18 ##
  19 query_apply=.dotest/.query_apply
  20
  21 ## We do not munge the first line of the commit message too much
  22 ## if this file exists.
  23 keep_subject=.dotest/.keep_subject
  24
  25 ## We do not attempt the 3-way merge fallback unless this file exists.
  26 fall_back_3way=.dotest/.3way
  27
  28 MSGFILE=$1
  29 PATCHFILE=$2
  30 INFO=$3
  31 SIGNOFF=$4
  32 EDIT=${VISUAL:-${EDITOR:-vi}}
  33
  34 export GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' "$INFO")"
  35 export GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' "$INFO")"
  36 export GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' "$INFO")"
  37 export SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' "$INFO")"
  38
  39 if test '' != "$SIGNOFF"
  40 then
  41         if test -f "$SIGNOFF"
  42         then
  43                 SIGNOFF=`cat "$SIGNOFF"` || exit
  44         elif case "$SIGNOFF" in yes | true | me | please) : ;; *) false ;; esac
  45         then
  46                 SIGNOFF=`git-var GIT_COMMITTER_IDENT | sed -e '
  47                                 s/>.*/>/
  48                                 s/^/Signed-off-by: /'
  49                 `
  50         else
  51                 SIGNOFF=
  52         fi
  53         if test '' != "$SIGNOFF"
  54         then
  55                 LAST_SIGNED_OFF_BY=`
  56                         sed -ne '/^Signed-off-by: /p' "$MSGFILE" |
  57                         tail -n 1
  58                 `
  59                 test "$LAST_SIGNED_OFF_BY" = "$SIGNOFF" || {
  60                     test '' = "$LAST_SIGNED_OFF_BY" && echo
  61                     echo "$SIGNOFF"
  62                 } >>"$MSGFILE"
  63         fi
  64 fi
  65
  66 patch_header=
  67 test -f "$keep_subject" || patch_header='[PATCH] '
  68
  69 {
  70         echo "$patch_header$SUBJECT"
  71         if test -s "$MSGFILE"
  72         then
  73                 echo
  74                 cat "$MSGFILE"
  75         fi
  76 } >"$final"
  77
  78 interactive=yes
  79 test -f "$query_apply" || interactive=no
  80
  81 while [ "$interactive" = yes ]; do
  82         echo "Commit Body is:"
  83         echo "--------------------------"
  84         cat "$final"
  85         echo "--------------------------"
  86         echo -n "Apply? [y]es/[n]o/[e]dit/[a]ccept all "
  87         read reply
  88         case "$reply" in
  89                 y|Y) interactive=no;;
  90                 n|N) exit 2;;   # special value to tell dotest to keep going
  91                 e|E) "$EDIT" "$final";;
  92                 a|A) rm -f "$query_apply"
  93                      interactive=no ;;
  94         esac
  95 done
  96
  97 if test -x "$GIT_DIR"/hooks/applypatch-msg
  98 then
  99         "$GIT_DIR"/hooks/applypatch-msg "$final" || exit
 100 fi
 101
 102 echo
 103 echo Applying "'$SUBJECT'"
 104 echo
 105
 106 git-apply --index "$PATCHFILE" || {
 107
 108         # git-apply exits with status 1 when the patch does not apply,
 109         # but it die()s with other failures, most notably upon corrupt
 110         # patch.  In the latter case, there is no point to try applying
 111         # it to another tree and do 3-way merge.
 112         test $? = 1 || exit 1
 113
 114         test -f "$fall_back_3way" || exit 1
 115
 116         # Here if we know which revision the patch applies to,
 117         # we create a temporary working tree and index, apply the
 118         # patch, and attempt 3-way merge with the resulting tree.
 119
 120         O_OBJECT=`cd "$GIT_OBJECT_DIRECTORY" && pwd`
 121         rm -fr .patch-merge-*
 122
 123         (
 124                 N=10
 125
 126                 # if the patch records the base tree...
 127                 sed -ne '
 128                         /^diff /q
 129                         /^applies-to: \([0-9a-f]*\)$/{
 130                                 s//\1/p
 131                                 q
 132                         }
 133                 ' "$PATCHFILE"
 134
 135                 # or hoping the patch is against our recent commits...
 136                 git-rev-list --max-count=$N HEAD
 137
 138                 # or hoping the patch is against known tags...
 139                 git-ls-remote --tags .
 140         ) |
 141         while read base junk
 142         do
 143                 # Try it if we have it as a tree.
 144                 git-cat-file tree "$base" >/dev/null 2>&1 || continue
 145
 146                 rm -fr .patch-merge-tmp-* &&
 147                 mkdir .patch-merge-tmp-dir || break
 148                 (
 149                         cd .patch-merge-tmp-dir &&
 150                         GIT_INDEX_FILE=../.patch-merge-tmp-index &&
 151                         GIT_OBJECT_DIRECTORY="$O_OBJECT" &&
 152                         export GIT_INDEX_FILE GIT_OBJECT_DIRECTORY &&
 153                         git-read-tree "$base" &&
 154                         git-apply --index &&
 155                         mv ../.patch-merge-tmp-index ../.patch-merge-index &&
 156                         echo "$base" >../.patch-merge-base
 157                 ) <"$PATCHFILE"  2>/dev/null && break
 158         done
 159
 160         test -f .patch-merge-index &&
 161         his_tree=$(GIT_INDEX_FILE=.patch-merge-index git-write-tree) &&
 162         orig_tree=$(cat .patch-merge-base) &&
 163         rm -fr .patch-merge-* || exit 1
 164
 165         echo Falling back to patching base and 3-way merge using $orig_tree...
 166
 167         # This is not so wrong.  Depending on which base we picked,
 168         # orig_tree may be wildly different from ours, but his_tree
 169         # has the same set of wildly different changes in parts the
 170         # patch did not touch, so resolve ends up cancelling them,
 171         # saying that we reverted all those changes.
 172
 173         if git-merge-resolve $orig_tree -- HEAD $his_tree
 174         then
 175                 echo Done.
 176         else
 177                 echo Failed to merge in the changes.
 178                 exit 1
 179         fi
 180 }
 181
 182 if test -x "$GIT_DIR"/hooks/pre-applypatch
 183 then
 184         "$GIT_DIR"/hooks/pre-applypatch || exit
 185 fi
 186
 187 tree=$(git-write-tree) || exit 1
 188 echo Wrote tree $tree
 189 parent=$(git-rev-parse --verify HEAD) &&
 190 commit=$(git-commit-tree $tree -p $parent <"$final") || exit 1
 191 echo Committed: $commit
 192 git-update-ref HEAD $commit $parent || exit
 193
 194 if test -x "$GIT_DIR"/hooks/post-applypatch
 195 then
 196         "$GIT_DIR"/hooks/post-applypatch
 197 fi