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 SUBDIRECTORY_OK=Yes
   8 OPTIONS_KEEPDASHDASH=
   9 OPTIONS_STUCKLONG=Yes
  10 OPTIONS_SPEC="\
  11 git pull [options] [<repository> [<refspec>...]]
  12
  13 Fetch one or more remote refs and integrate it/them with the current HEAD.
  14 --
  15 v,verbose                  be more verbose
  16 q,quiet                    be more quiet
  17 progress                   force progress reporting
  18
  19   Options related to merging
  20 r,rebase?false|true|preserve incorporate changes by rebasing rather than merging
  21 n!                         do not show a diffstat at the end of the merge
  22 stat                       show a diffstat at the end of the merge
  23 summary                    (synonym to --stat)
  24 log?n                      add (at most <n>) entries from shortlog to merge commit message
  25 squash                     create a single commit instead of doing a merge
  26 commit                     perform a commit if the merge succeeds (default)
  27 e,edit                       edit message before committing
  28 ff                         allow fast-forward
  29 ff-only!                   abort if fast-forward is not possible
  30 verify-signatures          verify that the named commit has a valid GPG signature
  31 s,strategy=strategy        merge strategy to use
  32 X,strategy-option=option   option for selected merge strategy
  33 S,gpg-sign?key-id          GPG sign commit
  34
  35   Options related to fetching
  36 all                        fetch from all remotes
  37 a,append                   append to .git/FETCH_HEAD instead of overwriting
  38 upload-pack=path           path to upload pack on remote end
  39 f,force                    force overwrite of local branch
  40 t,tags                     fetch all tags and associated objects
  41 p,prune                    prune remote-tracking branches no longer on remote
  42 recurse-submodules?on-demand control recursive fetching of submodules
  43 dry-run                    dry run
  44 k,keep                     keep downloaded pack
  45 depth=depth                deepen history of shallow clone
  46 unshallow                  convert to a complete repository
  47 update-shallow             accept refs that update .git/shallow
  48 refmap=refmap              specify fetch refmap
  49 "
  50 test $# -gt 0 && args="$*"
  51 . git-sh-setup
  52 . git-sh-i18n
  53 set_reflog_action "pull${args+ $args}"
  54 require_work_tree_exists
  55 cd_to_toplevel
  56
  57
  58 die_conflict () {
  59     git diff-index --cached --name-status -r --ignore-submodules HEAD --
  60     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  61         die "$(gettext "Pull is not possible because you have unmerged files.
  62 Please, fix them up in the work tree, and then use 'git add/rm <file>'
  63 as appropriate to mark resolution and make a commit.")"
  64     else
  65         die "$(gettext "Pull is not possible because you have unmerged files.")"
  66     fi
  67 }
  68
  69 die_merge () {
  70     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  71         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
  72 Please, commit your changes before you can merge.")"
  73     else
  74         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
  75     fi
  76 }
  77
  78 test -z "$(git ls-files -u)" || die_conflict
  79 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
  80
  81 bool_or_string_config () {
  82         git config --bool "$1" 2>/dev/null || git config "$1"
  83 }
  84
  85 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  86 log_arg= verbosity= progress= recurse_submodules= verify_signatures=
  87 merge_args= edit= rebase_args= all= append= upload_pack= force= tags= prune=
  88 keep= depth= unshallow= update_shallow= refmap=
  89 curr_branch=$(git symbolic-ref -q HEAD)
  90 curr_branch_short="${curr_branch#refs/heads/}"
  91 rebase=$(bool_or_string_config branch.$curr_branch_short.rebase)
  92 if test -z "$rebase"
  93 then
  94         rebase=$(bool_or_string_config pull.rebase)
  95 fi
  96
  97 # Setup default fast-forward options via `pull.ff`
  98 pull_ff=$(bool_or_string_config pull.ff)
  99 case "$pull_ff" in
 100 true)
 101         no_ff=--ff
 102         ;;
 103 false)
 104         no_ff=--no-ff
 105         ;;
 106 only)
 107         ff_only=--ff-only
 108         ;;
 109 esac
 110
 111
 112 dry_run=
 113 while :
 114 do
 115         case "$1" in
 116         -q|--quiet)
 117                 verbosity="$verbosity -q" ;;
 118         -v|--verbose)
 119                 verbosity="$verbosity -v" ;;
 120         --progress)
 121                 progress=--progress ;;
 122         --no-progress)
 123                 progress=--no-progress ;;
 124         -n|--no-stat|--no-summary)
 125                 diffstat=--no-stat ;;
 126         --stat|--summary)
 127                 diffstat=--stat ;;
 128         --log|--log=*|--no-log)
 129                 log_arg="$1" ;;
 130         --no-commit)
 131                 no_commit=--no-commit ;;
 132         --commit)
 133                 no_commit=--commit ;;
 134         -e|--edit)
 135                 edit=--edit ;;
 136         --no-edit)
 137                 edit=--no-edit ;;
 138         --squash)
 139                 squash=--squash ;;
 140         --no-squash)
 141                 squash=--no-squash ;;
 142         --ff)
 143                 no_ff=--ff ;;
 144         --no-ff)
 145                 no_ff=--no-ff ;;
 146         --ff-only)
 147                 ff_only=--ff-only ;;
 148         -s*|--strategy=*)
 149                 strategy_args="$strategy_args $1"
 150                 ;;
 151         -X*|--strategy-option=*)
 152                 merge_args="$merge_args $(git rev-parse --sq-quote "$1")"
 153                 ;;
 154         -r*|--rebase=*)
 155                 rebase="${1#*=}"
 156                 ;;
 157         --rebase)
 158                 rebase=true
 159                 ;;
 160         --no-rebase)
 161                 rebase=false
 162                 ;;
 163         --recurse-submodules)
 164                 recurse_submodules=--recurse-submodules
 165                 ;;
 166         --recurse-submodules=*)
 167                 recurse_submodules="$1"
 168                 ;;
 169         --no-recurse-submodules)
 170                 recurse_submodules=--no-recurse-submodules
 171                 ;;
 172         --verify-signatures)
 173                 verify_signatures=--verify-signatures
 174                 ;;
 175         --no-verify-signatures)
 176                 verify_signatures=--no-verify-signatures
 177                 ;;
 178         --gpg-sign|-S)
 179                 gpg_sign_args=-S
 180                 ;;
 181         --gpg-sign=*)
 182                 gpg_sign_args=$(git rev-parse --sq-quote "-S${1#--gpg-sign=}")
 183                 ;;
 184         -S*)
 185                 gpg_sign_args=$(git rev-parse --sq-quote "$1")
 186                 ;;
 187         --dry-run)
 188                 dry_run=--dry-run
 189                 ;;
 190         --all|--no-all)
 191                 all=$1 ;;
 192         -a|--append|--no-append)
 193                 append=$1 ;;
 194         --upload-pack=*|--no-upload-pack)
 195                 upload_pack=$1 ;;
 196         -f|--force|--no-force)
 197                 force="$force $1" ;;
 198         -t|--tags|--no-tags)
 199                 tags=$1 ;;
 200         -p|--prune|--no-prune)
 201                 prune=$1 ;;
 202         -k|--keep|--no-keep)
 203                 keep=$1 ;;
 204         --depth=*|--no-depth)
 205                 depth=$1 ;;
 206         --unshallow|--no-unshallow)
 207                 unshallow=$1 ;;
 208         --update-shallow|--no-update-shallow)
 209                 update_shallow=$1 ;;
 210         --refmap=*|--no-refmap)
 211                 refmap=$1 ;;
 212         -h|--help-all)
 213                 usage
 214                 ;;
 215         --)
 216                 shift
 217                 break
 218                 ;;
 219         *)
 220                 usage
 221                 ;;
 222         esac
 223         shift
 224 done
 225
 226 case "$rebase" in
 227 preserve)
 228         rebase=true
 229         rebase_args=--preserve-merges
 230         ;;
 231 true|false|'')
 232         ;;
 233 *)
 234         echo "Invalid value for --rebase, should be true, false, or preserve"
 235         usage
 236         exit 1
 237         ;;
 238 esac
 239
 240 error_on_no_merge_candidates () {
 241         exec >&2
 242
 243         if test true = "$rebase"
 244         then
 245                 op_type=rebase
 246                 op_prep=against
 247         else
 248                 op_type=merge
 249                 op_prep=with
 250         fi
 251
 252         upstream=$(git config "branch.$curr_branch_short.merge")
 253         remote=$(git config "branch.$curr_branch_short.remote")
 254
 255         if [ $# -gt 1 ]; then
 256                 if [ "$rebase" = true ]; then
 257                         printf "There is no candidate for rebasing against "
 258                 else
 259                         printf "There are no candidates for merging "
 260                 fi
 261                 echo "among the refs that you just fetched."
 262                 echo "Generally this means that you provided a wildcard refspec which had no"
 263                 echo "matches on the remote end."
 264         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 265                 echo "You asked to pull from the remote '$1', but did not specify"
 266                 echo "a branch. Because this is not the default configured remote"
 267                 echo "for your current branch, you must specify a branch on the command line."
 268         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
 269                 . git-parse-remote
 270                 error_on_missing_default_upstream "pull" $op_type $op_prep \
 271                         "git pull <remote> <branch>"
 272         else
 273                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 274                 echo "from the remote, but no such ref was fetched."
 275         fi
 276         exit 1
 277 }
 278
 279 test true = "$rebase" && {
 280         if ! git rev-parse -q --verify HEAD >/dev/null
 281         then
 282                 # On an unborn branch
 283                 if test -f "$(git rev-parse --git-path index)"
 284                 then
 285                         die "$(gettext "updating an unborn branch with changes added to the index")"
 286                 fi
 287         else
 288                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 289         fi
 290         oldremoteref= &&
 291         test -n "$curr_branch" &&
 292         . git-parse-remote &&
 293         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 294         oldremoteref=$(git merge-base --fork-point "$remoteref" $curr_branch 2>/dev/null)
 295 }
 296 orig_head=$(git rev-parse -q --verify HEAD)
 297 git fetch $verbosity $progress $dry_run $recurse_submodules $all $append \
 298 $upload_pack $force $tags $prune $keep $depth $unshallow $update_shallow \
 299 $refmap --update-head-ok "$@" || exit 1
 300 test -z "$dry_run" || exit 0
 301
 302 curr_head=$(git rev-parse -q --verify HEAD)
 303 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 304 then
 305         # The fetch involved updating the current branch.
 306
 307         # The working tree and the index file is still based on the
 308         # $orig_head commit, but we are merging into $curr_head.
 309         # First update the working tree to match $curr_head.
 310
 311         eval_gettextln "Warning: fetch updated the current branch head.
 312 Warning: fast-forwarding your working tree from
 313 Warning: commit \$orig_head." >&2
 314         git update-index -q --refresh
 315         git read-tree -u -m "$orig_head" "$curr_head" ||
 316                 die "$(eval_gettext "Cannot fast-forward your working tree.
 317 After making sure that you saved anything precious from
 318 $ git diff \$orig_head
 319 output, run
 320 $ git reset --hard
 321 to recover.")"
 322
 323 fi
 324
 325 merge_head=$(sed -e '/  not-for-merge   /d' \
 326         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 327         tr '\012' ' ')
 328
 329 case "$merge_head" in
 330 '')
 331         error_on_no_merge_candidates "$@"
 332         ;;
 333 ?*' '?*)
 334         if test -z "$orig_head"
 335         then
 336                 die "$(gettext "Cannot merge multiple branches into empty head")"
 337         fi
 338         if test true = "$rebase"
 339         then
 340                 die "$(gettext "Cannot rebase onto multiple branches")"
 341         fi
 342         ;;
 343 esac
 344
 345 # Pulling into unborn branch: a shorthand for branching off
 346 # FETCH_HEAD, for lazy typers.
 347 if test -z "$orig_head"
 348 then
 349         # Two-way merge: we claim the index is based on an empty tree,
 350         # and try to fast-forward to HEAD.  This ensures we will not
 351         # lose index/worktree changes that the user already made on
 352         # the unborn branch.
 353         empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
 354         git read-tree -m -u $empty_tree $merge_head &&
 355         git update-ref -m "initial pull" HEAD $merge_head "$curr_head"
 356         exit
 357 fi
 358
 359 if test true = "$rebase"
 360 then
 361         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 362         if test "$oldremoteref" = "$o"
 363         then
 364                 unset oldremoteref
 365         fi
 366 fi
 367
 368 case "$rebase" in
 369 true)
 370         eval="git-rebase $diffstat $strategy_args $merge_args $rebase_args $verbosity"
 371         eval="$eval $gpg_sign_args"
 372         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 373         ;;
 374 *)
 375         eval="git-merge $diffstat $no_commit $verify_signatures $edit $squash $no_ff $ff_only"
 376         eval="$eval $log_arg $strategy_args $merge_args $verbosity $progress"
 377         eval="$eval $gpg_sign_args"
 378         eval="$eval FETCH_HEAD"
 379         ;;
 380 esac
 381 eval "exec $eval"