contrib/examples/git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 SUBDIRECTORY_OK=Yes
   6 . git-sh-setup
   7 set_reflog_action "fetch $*"
   8 cd_to_toplevel ;# probably unnecessary...
   9
  10 . git-parse-remote
  11 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  12 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  13
  14 LF='
  15 '
  16 IFS="$LF"
  17
  18 no_tags=
  19 tags=
  20 append=
  21 force=
  22 verbose=
  23 update_head_ok=
  24 exec=
  25 keep=
  26 shallow_depth=
  27 no_progress=
  28 test -t 1 || no_progress=--no-progress
  29 quiet=
  30 while test $# != 0
  31 do
  32         case "$1" in
  33         -a|--a|--ap|--app|--appe|--appen|--append)
  34                 append=t
  35                 ;;
  36         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  37         --upload-pa|--upload-pac|--upload-pack)
  38                 shift
  39                 exec="--upload-pack=$1"
  40                 ;;
  41         --upl=*|--uplo=*|--uploa=*|--upload=*|\
  42         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
  43                 exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
  44                 shift
  45                 ;;
  46         -f|--f|--fo|--for|--forc|--force)
  47                 force=t
  48                 ;;
  49         -t|--t|--ta|--tag|--tags)
  50                 tags=t
  51                 ;;
  52         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  53                 no_tags=t
  54                 ;;
  55         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  56         --update-he|--update-hea|--update-head|--update-head-|\
  57         --update-head-o|--update-head-ok)
  58                 update_head_ok=t
  59                 ;;
  60         -q|--q|--qu|--qui|--quie|--quiet)
  61                 quiet=--quiet
  62                 ;;
  63         -v|--verbose)
  64                 verbose="$verbose"Yes
  65                 ;;
  66         -k|--k|--ke|--kee|--keep)
  67                 keep='-k -k'
  68                 ;;
  69         --depth=*)
  70                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  71                 ;;
  72         --depth)
  73                 shift
  74                 shallow_depth="--depth=$1"
  75                 ;;
  76         -*)
  77                 usage
  78                 ;;
  79         *)
  80                 break
  81                 ;;
  82         esac
  83         shift
  84 done
  85
  86 case "$#" in
  87 0)
  88         origin=$(get_default_remote)
  89         test -n "$(get_remote_url ${origin})" ||
  90                 die "Where do you want to fetch from today?"
  91         set x $origin ; shift ;;
  92 esac
  93
  94 if test -z "$exec"
  95 then
  96         # No command line override and we have configuration for the remote.
  97         exec="--upload-pack=$(get_uploadpack $1)"
  98 fi
  99
 100 remote_nick="$1"
 101 remote=$(get_remote_url "$@")
 102 refs=
 103 rref=
 104 rsync_slurped_objects=
 105
 106 if test "" = "$append"
 107 then
 108         : >"$GIT_DIR/FETCH_HEAD"
 109 fi
 110
 111 # Global that is reused later
 112 ls_remote_result=$(git ls-remote $exec "$remote") ||
 113         die "Cannot get the repository state from $remote"
 114
 115 append_fetch_head () {
 116         flags=
 117         test -n "$verbose" && flags="$flags$LF-v"
 118         test -n "$force$single_force" && flags="$flags$LF-f"
 119         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 120                 git fetch--tool $flags append-fetch-head "$@"
 121 }
 122
 123 # updating the current HEAD with git-fetch in a bare
 124 # repository is always fine.
 125 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 126 then
 127         orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
 128 fi
 129
 130 # Allow --tags/--notags from remote.$1.tagopt
 131 case "$tags$no_tags" in
 132 '')
 133         case "$(git config --get "remote.$1.tagopt")" in
 134         --tags)
 135                 tags=t ;;
 136         --no-tags)
 137                 no_tags=t ;;
 138         esac
 139 esac
 140
 141 # If --tags (and later --heads or --all) is specified, then we are
 142 # not talking about defaults stored in Pull: line of remotes or
 143 # branches file, and just fetch those and refspecs explicitly given.
 144 # Otherwise we do what we always did.
 145
 146 reflist=$(get_remote_refs_for_fetch "$@")
 147 if test "$tags"
 148 then
 149         taglist=`IFS='  ' &&
 150                   echo "$ls_remote_result" |
 151                   git show-ref --exclude-existing=refs/tags/ |
 152                   while read sha1 name
 153                   do
 154                         echo ".${name}:${name}"
 155                   done` || exit
 156         if test "$#" -gt 1
 157         then
 158                 # remote URL plus explicit refspecs; we need to merge them.
 159                 reflist="$reflist$LF$taglist"
 160         else
 161                 # No explicit refspecs; fetch tags only.
 162                 reflist=$taglist
 163         fi
 164 fi
 165
 166 fetch_all_at_once () {
 167
 168   eval=$(echo "$1" | git fetch--tool parse-reflist "-")
 169   eval "$eval"
 170
 171     ( : subshell because we muck with IFS
 172       IFS="     $LF"
 173       (
 174         if test "$remote" = . ; then
 175             git show-ref $rref || echo failed "$remote"
 176         elif test -f "$remote" ; then
 177             test -n "$shallow_depth" &&
 178                 die "shallow clone with bundle is not supported"
 179             git bundle unbundle "$remote" $rref ||
 180             echo failed "$remote"
 181         else
 182                 if      test -d "$remote" &&
 183
 184                         # The remote might be our alternate.  With
 185                         # this optimization we will bypass fetch-pack
 186                         # altogether, which means we cannot be doing
 187                         # the shallow stuff at all.
 188                         test ! -f "$GIT_DIR/shallow" &&
 189                         test -z "$shallow_depth" &&
 190
 191                         # See if all of what we are going to fetch are
 192                         # connected to our repository's tips, in which
 193                         # case we do not have to do any fetch.
 194                         theirs=$(echo "$ls_remote_result" | \
 195                                 git fetch--tool -s pick-rref "$rref" "-") &&
 196
 197                         # This will barf when $theirs reach an object that
 198                         # we do not have in our repository.  Otherwise,
 199                         # we already have everything the fetch would bring in.
 200                         git rev-list --objects $theirs --not --all \
 201                                 >/dev/null 2>/dev/null
 202                 then
 203                         echo "$ls_remote_result" | \
 204                                 git fetch--tool pick-rref "$rref" "-"
 205                 else
 206                         flags=
 207                         case $verbose in
 208                         YesYes*)
 209                             flags="-v"
 210                             ;;
 211                         esac
 212                         git-fetch-pack --thin $exec $keep $shallow_depth \
 213                                 $quiet $no_progress $flags "$remote" $rref ||
 214                         echo failed "$remote"
 215                 fi
 216         fi
 217       ) |
 218       (
 219         flags=
 220         test -n "$verbose" && flags="$flags -v"
 221         test -n "$force" && flags="$flags -f"
 222         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 223                 git fetch--tool $flags native-store \
 224                         "$remote" "$remote_nick" "$refs"
 225       )
 226     ) || exit
 227
 228 }
 229
 230 fetch_per_ref () {
 231   reflist="$1"
 232   refs=
 233   rref=
 234
 235   for ref in $reflist
 236   do
 237       refs="$refs$LF$ref"
 238
 239       # These are relative path from $GIT_DIR, typically starting at refs/
 240       # but may be HEAD
 241       if expr "z$ref" : 'z\.' >/dev/null
 242       then
 243           not_for_merge=t
 244           ref=$(expr "z$ref" : 'z\.\(.*\)')
 245       else
 246           not_for_merge=
 247       fi
 248       if expr "z$ref" : 'z+' >/dev/null
 249       then
 250           single_force=t
 251           ref=$(expr "z$ref" : 'z+\(.*\)')
 252       else
 253           single_force=
 254       fi
 255       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 256       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 257
 258       rref="$rref$LF$remote_name"
 259
 260       # There are transports that can fetch only one head at a time...
 261       case "$remote" in
 262       http://* | https://* | ftp://*)
 263           test -n "$shallow_depth" &&
 264                 die "shallow clone with http not supported"
 265           proto=`expr "$remote" : '\([^:]*\):'`
 266           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 267               curl_extra_args="-k"
 268           fi
 269           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 270                 "`git config --bool http.noEPSV`" = true ]; then
 271               noepsv_opt="--disable-epsv"
 272           fi
 273
 274           # Find $remote_name from ls-remote output.
 275           head=$(echo "$ls_remote_result" | \
 276                 git fetch--tool -s pick-rref "$remote_name" "-")
 277           expr "z$head" : "z$_x40\$" >/dev/null ||
 278                 die "No such ref $remote_name at $remote"
 279           echo >&2 "Fetching $remote_name from $remote using $proto"
 280           case "$quiet" in '') v=-v ;; *) v= ;; esac
 281           git-http-fetch $v -a "$head" "$remote" || exit
 282           ;;
 283       rsync://*)
 284           test -n "$shallow_depth" &&
 285                 die "shallow clone with rsync not supported"
 286           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 287           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 288           head=$(git rev-parse --verify TMP_HEAD)
 289           rm -f "$TMP_HEAD"
 290           case "$quiet" in '') v=-v ;; *) v= ;; esac
 291           test "$rsync_slurped_objects" || {
 292               rsync -a $v --ignore-existing --exclude info \
 293                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 294
 295               # Look at objects/info/alternates for rsync -- http will
 296               # support it natively and git native ones will do it on
 297               # the remote end.  Not having that file is not a crime.
 298               rsync -q "$remote/objects/info/alternates" \
 299                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 300                   rm -f "$GIT_DIR/TMP_ALT"
 301               if test -f "$GIT_DIR/TMP_ALT"
 302               then
 303                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 304                   while read alt
 305                   do
 306                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 307                       echo >&2 "Getting alternate: $alt"
 308                       rsync -av --ignore-existing --exclude info \
 309                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 310                   done
 311                   rm -f "$GIT_DIR/TMP_ALT"
 312               fi
 313               rsync_slurped_objects=t
 314           }
 315           ;;
 316       esac
 317
 318       append_fetch_head "$head" "$remote" \
 319           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 320
 321   done
 322
 323 }
 324
 325 fetch_main () {
 326         case "$remote" in
 327         http://* | https://* | ftp://* | rsync://* )
 328                 fetch_per_ref "$@"
 329                 ;;
 330         *)
 331                 fetch_all_at_once "$@"
 332                 ;;
 333         esac
 334 }
 335
 336 fetch_main "$reflist" || exit
 337
 338 # automated tag following
 339 case "$no_tags$tags" in
 340 '')
 341         case "$reflist" in
 342         *:refs/*)
 343                 # effective only when we are following remote branch
 344                 # using local tracking branch.
 345                 taglist=$(IFS=' ' &&
 346                 echo "$ls_remote_result" |
 347                 git show-ref --exclude-existing=refs/tags/ |
 348                 while read sha1 name
 349                 do
 350                         git cat-file -t "$sha1" >/dev/null 2>&1 || continue
 351                         echo >&2 "Auto-following $name"
 352                         echo ".${name}:${name}"
 353                 done)
 354         esac
 355         case "$taglist" in
 356         '') ;;
 357         ?*)
 358                 # do not deepen a shallow tree when following tags
 359                 shallow_depth=
 360                 fetch_main "$taglist" || exit ;;
 361         esac
 362 esac
 363
 364 # If the original head was empty (i.e. no "master" yet), or
 365 # if we were told not to worry, we do not have to check.
 366 case "$orig_head" in
 367 '')
 368         ;;
 369 ?*)
 370         curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
 371         if test "$curr_head" != "$orig_head"
 372         then
 373             git update-ref \
 374                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 375                         HEAD "$orig_head"
 376                 die "Cannot fetch into the current branch."
 377         fi
 378         ;;
 379 esac