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 case "$#" in 0) break ;; esac
  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=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 --notags from remote.$1.tagopt
 131 case "$tags$no_tags" in
 132 '')
 133         case "$(git-config --get "remote.$1.tagopt")" in
 134         --no-tags)
 135                 no_tags=t ;;
 136         esac
 137 esac
 138
 139 # If --tags (and later --heads or --all) is specified, then we are
 140 # not talking about defaults stored in Pull: line of remotes or
 141 # branches file, and just fetch those and refspecs explicitly given.
 142 # Otherwise we do what we always did.
 143
 144 reflist=$(get_remote_refs_for_fetch "$@")
 145 if test "$tags"
 146 then
 147         taglist=`IFS='  ' &&
 148                   echo "$ls_remote_result" |
 149                   git-show-ref --exclude-existing=refs/tags/ |
 150                   while read sha1 name
 151                   do
 152                         echo ".${name}:${name}"
 153                   done` || exit
 154         if test "$#" -gt 1
 155         then
 156                 # remote URL plus explicit refspecs; we need to merge them.
 157                 reflist="$reflist$LF$taglist"
 158         else
 159                 # No explicit refspecs; fetch tags only.
 160                 reflist=$taglist
 161         fi
 162 fi
 163
 164 fetch_all_at_once () {
 165
 166   eval=$(echo "$1" | git-fetch--tool parse-reflist "-")
 167   eval "$eval"
 168
 169     ( : subshell because we muck with IFS
 170       IFS="     $LF"
 171       (
 172         if test "$remote" = . ; then
 173             git-show-ref $rref || echo failed "$remote"
 174         elif test -f "$remote" ; then
 175             test -n "$shallow_depth" &&
 176                 die "shallow clone with bundle is not supported"
 177             git-bundle unbundle "$remote" $rref ||
 178             echo failed "$remote"
 179         else
 180           git-fetch-pack --thin $exec $keep $shallow_depth \
 181               $quiet $no_progress "$remote" $rref ||
 182           echo failed "$remote"
 183         fi
 184       ) |
 185       (
 186         flags=
 187         test -n "$verbose" && flags="$flags -v"
 188         test -n "$force" && flags="$flags -f"
 189         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 190                 git-fetch--tool $flags native-store \
 191                         "$remote" "$remote_nick" "$refs"
 192       )
 193     ) || exit
 194
 195 }
 196
 197 fetch_per_ref () {
 198   reflist="$1"
 199   refs=
 200   rref=
 201
 202   for ref in $reflist
 203   do
 204       refs="$refs$LF$ref"
 205
 206       # These are relative path from $GIT_DIR, typically starting at refs/
 207       # but may be HEAD
 208       if expr "z$ref" : 'z\.' >/dev/null
 209       then
 210           not_for_merge=t
 211           ref=$(expr "z$ref" : 'z\.\(.*\)')
 212       else
 213           not_for_merge=
 214       fi
 215       if expr "z$ref" : 'z+' >/dev/null
 216       then
 217           single_force=t
 218           ref=$(expr "z$ref" : 'z+\(.*\)')
 219       else
 220           single_force=
 221       fi
 222       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 223       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 224
 225       rref="$rref$LF$remote_name"
 226
 227       # There are transports that can fetch only one head at a time...
 228       case "$remote" in
 229       http://* | https://* | ftp://*)
 230           test -n "$shallow_depth" &&
 231                 die "shallow clone with http not supported"
 232           proto=`expr "$remote" : '\([^:]*\):'`
 233           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 234               curl_extra_args="-k"
 235           fi
 236           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 237                 "`git-config --bool http.noEPSV`" = true ]; then
 238               noepsv_opt="--disable-epsv"
 239           fi
 240
 241           # Find $remote_name from ls-remote output.
 242           head=$(
 243                 IFS='   '
 244                 echo "$ls_remote_result" |
 245                 while read sha1 name
 246                 do
 247                         test "z$name" = "z$remote_name" || continue
 248                         echo "$sha1"
 249                         break
 250                 done
 251           )
 252           expr "z$head" : "z$_x40\$" >/dev/null ||
 253                 die "No such ref $remote_name at $remote"
 254           echo >&2 "Fetching $remote_name from $remote using $proto"
 255           case "$quiet" in '') v=-v ;; *) v= ;; esac
 256           git-http-fetch $v -a "$head" "$remote" || exit
 257           ;;
 258       rsync://*)
 259           test -n "$shallow_depth" &&
 260                 die "shallow clone with rsync not supported"
 261           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 262           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 263           head=$(git-rev-parse --verify TMP_HEAD)
 264           rm -f "$TMP_HEAD"
 265           case "$quiet" in '') v=-v ;; *) v= ;; esac
 266           test "$rsync_slurped_objects" || {
 267               rsync -a $v --ignore-existing --exclude info \
 268                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 269
 270               # Look at objects/info/alternates for rsync -- http will
 271               # support it natively and git native ones will do it on
 272               # the remote end.  Not having that file is not a crime.
 273               rsync -q "$remote/objects/info/alternates" \
 274                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 275                   rm -f "$GIT_DIR/TMP_ALT"
 276               if test -f "$GIT_DIR/TMP_ALT"
 277               then
 278                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 279                   while read alt
 280                   do
 281                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 282                       echo >&2 "Getting alternate: $alt"
 283                       rsync -av --ignore-existing --exclude info \
 284                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 285                   done
 286                   rm -f "$GIT_DIR/TMP_ALT"
 287               fi
 288               rsync_slurped_objects=t
 289           }
 290           ;;
 291       esac
 292
 293       append_fetch_head "$head" "$remote" \
 294           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 295
 296   done
 297
 298 }
 299
 300 fetch_main () {
 301         case "$remote" in
 302         http://* | https://* | ftp://* | rsync://* )
 303                 fetch_per_ref "$@"
 304                 ;;
 305         *)
 306                 fetch_all_at_once "$@"
 307                 ;;
 308         esac
 309 }
 310
 311 fetch_main "$reflist" || exit
 312
 313 # automated tag following
 314 case "$no_tags$tags" in
 315 '')
 316         case "$reflist" in
 317         *:refs/*)
 318                 # effective only when we are following remote branch
 319                 # using local tracking branch.
 320                 taglist=$(IFS=' ' &&
 321                 echo "$ls_remote_result" |
 322                 git-show-ref --exclude-existing=refs/tags/ |
 323                 while read sha1 name
 324                 do
 325                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 326                         echo >&2 "Auto-following $name"
 327                         echo ".${name}:${name}"
 328                 done)
 329         esac
 330         case "$taglist" in
 331         '') ;;
 332         ?*)
 333                 # do not deepen a shallow tree when following tags
 334                 shallow_depth=
 335                 fetch_main "$taglist" || exit ;;
 336         esac
 337 esac
 338
 339 # If the original head was empty (i.e. no "master" yet), or
 340 # if we were told not to worry, we do not have to check.
 341 case "$orig_head" in
 342 '')
 343         ;;
 344 ?*)
 345         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 346         if test "$curr_head" != "$orig_head"
 347         then
 348             git-update-ref \
 349                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 350                         HEAD "$orig_head"
 351                 die "Cannot fetch into the current branch."
 352         fi
 353         ;;
 354 esac