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