git-pull.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5 # Fetch one or more remote refs and merge it/them into the current HEAD.
   6
   7 USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff|--ff-only] [--[no-]rebase|--rebase=preserve] [-s strategy]... [<fetch-options>] <repo> <head>...'
   8 LONG_USAGE='Fetch one or more remote refs and integrate it/them with the current HEAD.'
   9 SUBDIRECTORY_OK=Yes
  10 OPTIONS_SPEC=
  11 . git-sh-setup
  12 . git-sh-i18n
  13 set_reflog_action "pull${1+ $*}"
  14 require_work_tree_exists
  15 cd_to_toplevel
  16
  17
  18 die_conflict () {
  19     git diff-index --cached --name-status -r --ignore-submodules HEAD --
  20     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  21         die "$(gettext "Pull is not possible because you have unmerged files.
  22 Please, fix them up in the work tree, and then use 'git add/rm <file>'
  23 as appropriate to mark resolution, or use 'git commit -a'.")"
  24     else
  25         die "$(gettext "Pull is not possible because you have unmerged files.")"
  26     fi
  27 }
  28
  29 die_merge () {
  30     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  31         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
  32 Please, commit your changes before you can merge.")"
  33     else
  34         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
  35     fi
  36 }
  37
  38 test -z "$(git ls-files -u)" || die_conflict
  39 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
  40
  41 bool_or_string_config () {
  42         git config --bool "$1" 2>/dev/null || git config "$1"
  43 }
  44
  45 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  46 log_arg= verbosity= progress= recurse_submodules= verify_signatures=
  47 merge_args= edit= rebase_args=
  48 curr_branch=$(git symbolic-ref -q HEAD)
  49 curr_branch_short="${curr_branch#refs/heads/}"
  50 rebase=$(bool_or_string_config branch.$curr_branch_short.rebase)
  51 if test -z "$rebase"
  52 then
  53         rebase=$(bool_or_string_config pull.rebase)
  54 fi
  55
  56 # Setup default fast-forward options via `pull.ff`
  57 pull_ff=$(git config pull.ff)
  58 case "$pull_ff" in
  59 false)
  60         no_ff=--no-ff
  61         break
  62         ;;
  63 only)
  64         ff_only=--ff-only
  65         break
  66         ;;
  67 esac
  68
  69
  70 dry_run=
  71 while :
  72 do
  73         case "$1" in
  74         -q|--quiet)
  75                 verbosity="$verbosity -q" ;;
  76         -v|--verbose)
  77                 verbosity="$verbosity -v" ;;
  78         --progress)
  79                 progress=--progress ;;
  80         --no-progress)
  81                 progress=--no-progress ;;
  82         -n|--no-stat|--no-summary)
  83                 diffstat=--no-stat ;;
  84         --stat|--summary)
  85                 diffstat=--stat ;;
  86         --log|--no-log)
  87                 log_arg=$1 ;;
  88         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  89                 no_commit=--no-commit ;;
  90         --c|--co|--com|--comm|--commi|--commit)
  91                 no_commit=--commit ;;
  92         -e|--edit)
  93                 edit=--edit ;;
  94         --no-edit)
  95                 edit=--no-edit ;;
  96         --sq|--squ|--squa|--squas|--squash)
  97                 squash=--squash ;;
  98         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  99                 squash=--no-squash ;;
 100         --ff)
 101                 no_ff=--ff ;;
 102         --no-ff)
 103                 no_ff=--no-ff ;;
 104         --ff-only)
 105                 ff_only=--ff-only ;;
 106         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 107                 --strateg=*|--strategy=*|\
 108         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 109                 case "$#,$1" in
 110                 *,*=*)
 111                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 112                 1,*)
 113                         usage ;;
 114                 *)
 115                         strategy="$2"
 116                         shift ;;
 117                 esac
 118                 strategy_args="${strategy_args}-s $strategy "
 119                 ;;
 120         -X*)
 121                 case "$#,$1" in
 122                 1,-X)
 123                         usage ;;
 124                 *,-X)
 125                         xx="-X $(git rev-parse --sq-quote "$2")"
 126                         shift ;;
 127                 *,*)
 128                         xx=$(git rev-parse --sq-quote "$1") ;;
 129                 esac
 130                 merge_args="$merge_args$xx "
 131                 ;;
 132         -r=*|--r=*|--re=*|--reb=*|--reba=*|--rebas=*|--rebase=*)
 133                 rebase="${1#*=}"
 134                 ;;
 135         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 136                 rebase=true
 137                 ;;
 138         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 139                 rebase=false
 140                 ;;
 141         --recurse-submodules)
 142                 recurse_submodules=--recurse-submodules
 143                 ;;
 144         --recurse-submodules=*)
 145                 recurse_submodules="$1"
 146                 ;;
 147         --no-recurse-submodules)
 148                 recurse_submodules=--no-recurse-submodules
 149                 ;;
 150         --verify-signatures)
 151                 verify_signatures=--verify-signatures
 152                 ;;
 153         --no-verify-signatures)
 154                 verify_signatures=--no-verify-signatures
 155                 ;;
 156         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 157                 dry_run=--dry-run
 158                 ;;
 159         -h|--help-all)
 160                 usage
 161                 ;;
 162         *)
 163                 # Pass thru anything that may be meant for fetch.
 164                 break
 165                 ;;
 166         esac
 167         shift
 168 done
 169
 170 case "$rebase" in
 171 preserve)
 172         rebase=true
 173         rebase_args=--preserve-merges
 174         ;;
 175 true|false|'')
 176         ;;
 177 *)
 178         echo "Invalid value for --rebase, should be true, false, or preserve"
 179         usage
 180         exit 1
 181         ;;
 182 esac
 183
 184 error_on_no_merge_candidates () {
 185         exec >&2
 186         for opt
 187         do
 188                 case "$opt" in
 189                 -t|--t|--ta|--tag|--tags)
 190                         echo "It doesn't make sense to pull all tags; you probably meant:"
 191                         echo "  git fetch --tags"
 192                         exit 1
 193                 esac
 194         done
 195
 196         if test true = "$rebase"
 197         then
 198                 op_type=rebase
 199                 op_prep=against
 200         else
 201                 op_type=merge
 202                 op_prep=with
 203         fi
 204
 205         upstream=$(git config "branch.$curr_branch_short.merge")
 206         remote=$(git config "branch.$curr_branch_short.remote")
 207
 208         if [ $# -gt 1 ]; then
 209                 if [ "$rebase" = true ]; then
 210                         printf "There is no candidate for rebasing against "
 211                 else
 212                         printf "There are no candidates for merging "
 213                 fi
 214                 echo "among the refs that you just fetched."
 215                 echo "Generally this means that you provided a wildcard refspec which had no"
 216                 echo "matches on the remote end."
 217         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 218                 echo "You asked to pull from the remote '$1', but did not specify"
 219                 echo "a branch. Because this is not the default configured remote"
 220                 echo "for your current branch, you must specify a branch on the command line."
 221         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
 222                 . git-parse-remote
 223                 error_on_missing_default_upstream "pull" $op_type $op_prep \
 224                         "git pull <remote> <branch>"
 225         else
 226                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 227                 echo "from the remote, but no such ref was fetched."
 228         fi
 229         exit 1
 230 }
 231
 232 test true = "$rebase" && {
 233         if ! git rev-parse -q --verify HEAD >/dev/null
 234         then
 235                 # On an unborn branch
 236                 if test -f "$GIT_DIR/index"
 237                 then
 238                         die "$(gettext "updating an unborn branch with changes added to the index")"
 239                 fi
 240         else
 241                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 242         fi
 243         oldremoteref= &&
 244         test -n "$curr_branch" &&
 245         . git-parse-remote &&
 246         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 247         oldremoteref=$(git merge-base --fork-point "$remoteref" $curr_branch 2>/dev/null)
 248 }
 249 orig_head=$(git rev-parse -q --verify HEAD)
 250 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 251 test -z "$dry_run" || exit 0
 252
 253 curr_head=$(git rev-parse -q --verify HEAD)
 254 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 255 then
 256         # The fetch involved updating the current branch.
 257
 258         # The working tree and the index file is still based on the
 259         # $orig_head commit, but we are merging into $curr_head.
 260         # First update the working tree to match $curr_head.
 261
 262         eval_gettextln "Warning: fetch updated the current branch head.
 263 Warning: fast-forwarding your working tree from
 264 Warning: commit \$orig_head." >&2
 265         git update-index -q --refresh
 266         git read-tree -u -m "$orig_head" "$curr_head" ||
 267                 die "$(eval_gettext "Cannot fast-forward your working tree.
 268 After making sure that you saved anything precious from
 269 $ git diff \$orig_head
 270 output, run
 271 $ git reset --hard
 272 to recover.")"
 273
 274 fi
 275
 276 merge_head=$(sed -e '/  not-for-merge   /d' \
 277         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 278         tr '\012' ' ')
 279
 280 case "$merge_head" in
 281 '')
 282         error_on_no_merge_candidates "$@"
 283         ;;
 284 ?*' '?*)
 285         if test -z "$orig_head"
 286         then
 287                 die "$(gettext "Cannot merge multiple branches into empty head")"
 288         fi
 289         if test true = "$rebase"
 290         then
 291                 die "$(gettext "Cannot rebase onto multiple branches")"
 292         fi
 293         ;;
 294 esac
 295
 296 # Pulling into unborn branch: a shorthand for branching off
 297 # FETCH_HEAD, for lazy typers.
 298 if test -z "$orig_head"
 299 then
 300         # Two-way merge: we claim the index is based on an empty tree,
 301         # and try to fast-forward to HEAD.  This ensures we will not
 302         # lose index/worktree changes that the user already made on
 303         # the unborn branch.
 304         empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
 305         git read-tree -m -u $empty_tree $merge_head &&
 306         git update-ref -m "initial pull" HEAD $merge_head "$curr_head"
 307         exit
 308 fi
 309
 310 if test true = "$rebase"
 311 then
 312         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 313         if test "$oldremoteref" = "$o"
 314         then
 315                 unset oldremoteref
 316         fi
 317 fi
 318
 319 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 320 case "$rebase" in
 321 true)
 322         eval="git-rebase $diffstat $strategy_args $merge_args $rebase_args $verbosity"
 323         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 324         ;;
 325 *)
 326         eval="git-merge $diffstat $no_commit $verify_signatures $edit $squash $no_ff $ff_only"
 327         eval="$eval  $log_arg $strategy_args $merge_args $verbosity $progress"
 328         eval="$eval \"\$merge_name\" HEAD $merge_head"
 329         ;;
 330 esac
 331 eval "exec $eval"