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