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 "$GIT_DIR/MERGE_HEAD" && die_merge
  39
  40 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  41 log_arg= verbosity= progress= recurse_submodules=
  42 merge_args=
  43 curr_branch=$(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$xx "
 101                 ;;
 102         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 103                 rebase=true
 104                 ;;
 105         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 106                 rebase=false
 107                 ;;
 108         --recurse-submodules)
 109                 recurse_submodules=--recurse-submodules
 110                 ;;
 111         --no-recurse-submodules)
 112                 recurse_submodules=--no-recurse-submodules
 113                 ;;
 114         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 115                 dry_run=--dry-run
 116                 ;;
 117         -h|--h|--he|--hel|--help)
 118                 usage
 119                 ;;
 120         *)
 121                 # Pass thru anything that may be meant for fetch.
 122                 break
 123                 ;;
 124         esac
 125         shift
 126 done
 127
 128 error_on_no_merge_candidates () {
 129         exec >&2
 130         for opt
 131         do
 132                 case "$opt" in
 133                 -t|--t|--ta|--tag|--tags)
 134                         echo "Fetching tags only, you probably meant:"
 135                         echo "  git fetch --tags"
 136                         exit 1
 137                 esac
 138         done
 139
 140         if test true = "$rebase"
 141         then
 142                 op_type=rebase
 143                 op_prep=against
 144         else
 145                 op_type=merge
 146                 op_prep=with
 147         fi
 148
 149         curr_branch=${curr_branch#refs/heads/}
 150         upstream=$(git config "branch.$curr_branch.merge")
 151         remote=$(git config "branch.$curr_branch.remote")
 152
 153         if [ $# -gt 1 ]; then
 154                 if [ "$rebase" = true ]; then
 155                         printf "There is no candidate for rebasing against "
 156                 else
 157                         printf "There are no candidates for merging "
 158                 fi
 159                 echo "among the refs that you just fetched."
 160                 echo "Generally this means that you provided a wildcard refspec which had no"
 161                 echo "matches on the remote end."
 162         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 163                 echo "You asked to pull from the remote '$1', but did not specify"
 164                 echo "a branch. Because this is not the default configured remote"
 165                 echo "for your current branch, you must specify a branch on the command line."
 166         elif [ -z "$curr_branch" ]; then
 167                 echo "You are not currently on a branch, so I cannot use any"
 168                 echo "'branch.<branchname>.merge' in your configuration file."
 169                 echo "Please specify which remote branch you want to use on the command"
 170                 echo "line and try again (e.g. 'git pull <repository> <refspec>')."
 171                 echo "See git-pull(1) for details."
 172         elif [ -z "$upstream" ]; then
 173                 echo "You asked me to pull without telling me which branch you"
 174                 echo "want to $op_type $op_prep, and 'branch.${curr_branch}.merge' in"
 175                 echo "your configuration file does not tell me, either. Please"
 176                 echo "specify which branch you want to use on the command line and"
 177                 echo "try again (e.g. 'git pull <repository> <refspec>')."
 178                 echo "See git-pull(1) for details."
 179                 echo
 180                 echo "If you often $op_type $op_prep the same branch, you may want to"
 181                 echo "use something like the following in your configuration file:"
 182                 echo
 183                 echo "    [branch \"${curr_branch}\"]"
 184                 echo "    remote = <nickname>"
 185                 echo "    merge = <remote-ref>"
 186                 test rebase = "$op_type" &&
 187                         echo "    rebase = true"
 188                 echo
 189                 echo "    [remote \"<nickname>\"]"
 190                 echo "    url = <url>"
 191                 echo "    fetch = <refspec>"
 192                 echo
 193                 echo "See git-config(1) for details."
 194         else
 195                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 196                 echo "from the remote, but no such ref was fetched."
 197         fi
 198         exit 1
 199 }
 200
 201 test true = "$rebase" && {
 202         if ! git rev-parse -q --verify HEAD >/dev/null
 203         then
 204                 # On an unborn branch
 205                 if test -f "$GIT_DIR/index"
 206                 then
 207                         die "updating an unborn branch with changes added to the index"
 208                 fi
 209         else
 210                 git update-index --ignore-submodules --refresh &&
 211                 git diff-files --ignore-submodules --quiet &&
 212                 git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 213                 die "refusing to pull with rebase: your working tree is not up-to-date"
 214         fi
 215         oldremoteref= &&
 216         . git-parse-remote &&
 217         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 218         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 219         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 220         do
 221                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 222                 then
 223                         oldremoteref="$reflog"
 224                         break
 225                 fi
 226         done
 227 }
 228 orig_head=$(git rev-parse -q --verify HEAD)
 229 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 230 test -z "$dry_run" || exit 0
 231
 232 curr_head=$(git rev-parse -q --verify HEAD)
 233 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 234 then
 235         # The fetch involved updating the current branch.
 236
 237         # The working tree and the index file is still based on the
 238         # $orig_head commit, but we are merging into $curr_head.
 239         # First update the working tree to match $curr_head.
 240
 241         echo >&2 "Warning: fetch updated the current branch head."
 242         echo >&2 "Warning: fast-forwarding your working tree from"
 243         echo >&2 "Warning: commit $orig_head."
 244         git update-index -q --refresh
 245         git read-tree -u -m "$orig_head" "$curr_head" ||
 246                 die 'Cannot fast-forward your working tree.
 247 After making sure that you saved anything precious from
 248 $ git diff '$orig_head'
 249 output, run
 250 $ git reset --hard
 251 to recover.'
 252
 253 fi
 254
 255 merge_head=$(sed -e '/  not-for-merge   /d' \
 256         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 257         tr '\012' ' ')
 258
 259 case "$merge_head" in
 260 '')
 261         error_on_no_merge_candidates "$@"
 262         ;;
 263 ?*' '?*)
 264         if test -z "$orig_head"
 265         then
 266                 die "Cannot merge multiple branches into empty head"
 267         fi
 268         if test true = "$rebase"
 269         then
 270                 die "Cannot rebase onto multiple branches"
 271         fi
 272         ;;
 273 esac
 274
 275 if test -z "$orig_head"
 276 then
 277         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 278         git read-tree --reset -u HEAD || exit 1
 279         exit
 280 fi
 281
 282 if test true = "$rebase"
 283 then
 284         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 285         if test "$oldremoteref" = "$o"
 286         then
 287                 unset oldremoteref
 288         fi
 289 fi
 290
 291 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 292 case "$rebase" in
 293 true)
 294         eval="git-rebase $diffstat $strategy_args $merge_args"
 295         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 296         ;;
 297 *)
 298         eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
 299         eval="$eval  $log_arg $strategy_args $merge_args"
 300         eval="$eval \"\$merge_name\" HEAD $merge_head $verbosity"
 301         ;;
 302 esac
 303 eval "exec $eval"