зеркало из https://github.com/microsoft/git.git
[PATCH] Multi-head fetch.
Traditionally, fetch takes these forms:
$ git fetch <remote>
$ git fetch <remote> <head>
$ git fetch <remote> tag <tag>
This patch updates it to take
$ git fetch <remote> <refspec>...
where:
- A <refspec> of form "<src>:<dst>" is to fetch the objects
needed for the remote ref that matches <src>, and if <dst>
is not empty, store it as a local <dst>.
- "tag" followed by <next> is just an old way of saying
"refs/tags/<next>:refs/tags/<next>"; this mimics the
current behaviour of the third form above and means "fetch
that tag and store it under the same name".
- A single token <refspec> without colon is a shorthand for
"<refspec>:" That is, "fetch that ref but do not store
anywhere".
- when there is no <refspec> specified
- if <remote> is the name of a file under $GIT_DIR/remotes/
(i.e. a new-style shorthand), then it is the same as giving
the <refspec>s listed on Pull: line in that file.
- if <remote> is the name of a file under $GIT_DIR/branches/
(i.e. an old-style shorthand, without trailing path), then it
is the same as giving a single <refspec>
"<remote-name>:refs/heads/<remote>" on the command line, where
<remote-name> is the remote branch name (defaults to HEAD, but
can be overridden by .git/branches/<remote> file having the
URL fragment notation). That is, "fetch that branch head and
store it in refs/heads/<remote>".
- otherwise, it is the same as giving a single <refspec>
that is "HEAD:".
The SHA1 object names of fetched refs are stored in FETCH_HEAD,
one name per line, with a comment to describe where it came from.
This is later used by "git resolve" and "git octopus".
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
Родитель
ac4b0cff00
Коммит
853a3697dc
191
git-fetch-script
191
git-fetch-script
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@ -1,54 +1,159 @@
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#!/bin/sh
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#
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. git-sh-setup-script || die "Not a git archive"
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. git-parse-remote "$@"
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merge_repo="$_remote_repo"
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merge_head="$_remote_head"
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merge_store="$_remote_store"
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. git-parse-remote-script
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_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
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_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
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TMP_HEAD="$GIT_DIR/TMP_HEAD"
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append=
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case "$#" in
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0)
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die "Where do you want to fetch from?" ;;
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*)
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case "$1" in
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-a|--a|--ap|--app|--appe|--appen|--append)
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append=t
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shift ;;
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esac
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esac
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remote_nick="$1"
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remote=$(get_remote_url "$@")
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refs=
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rref=
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rsync_slurped_objects=
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case "$merge_repo" in
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http://* | https://*)
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if [ -n "$GIT_SSL_NO_VERIFY" ]; then
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curl_extra_args="-k"
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fi
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_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]' &&
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_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40" &&
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head=$(curl -nsf $curl_extra_args "$merge_repo/$merge_head") &&
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expr "$head" : "$_x40\$" >/dev/null || {
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echo >&2 "Failed to fetch $merge_head from $merge_repo"
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exit 1
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}
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echo Fetching "$merge_head" using http
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git-http-pull -v -a "$head" "$merge_repo/" || exit
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if test "" = "$append"
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then
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: >$GIT_DIR/FETCH_HEAD
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fi
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append_fetch_head () {
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head_="$1"
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remote_="$2"
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remote_name_="$3"
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remote_nick_="$4"
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local_name_="$5"
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# 2.6.11-tree tag would not be happy to be fed to resolve.
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if git-cat-file commit "$head_" >/dev/null 2>&1
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then
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head_=$(git-rev-parse --verify "$head_^0") || exit
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note_="$head_ $remote_name_ from $remote_nick_"
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echo "$note_" >>$GIT_DIR/FETCH_HEAD
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echo >&2 "* committish: $note_"
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else
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echo >&2 "* non-commit: $note_"
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fi
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if test "$local_name_" != ""
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then
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# We are storing the head locally. Make sure that it is
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# a fast forward (aka "reverse push").
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fast_forward_local "$local_name_" "$head_" "$remote_" "$remote_name_"
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fi
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}
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fast_forward_local () {
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case "$1" in
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refs/tags/*)
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# Tags need not be pointing at commits so there
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# is no way to guarantee "fast-forward" anyway.
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echo "$2" >"$GIT_DIR/$1" ;;
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refs/heads/*)
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# NEEDSWORK: use the same cmpxchg protocol here.
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echo "$2" >"$GIT_DIR/$1.lock"
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if test -f "$GIT_DIR/$1"
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then
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local=$(git-rev-parse --verify "$1^0") &&
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mb=$(git-merge-base "$local" "$2") &&
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case "$2,$mb" in
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$local,*)
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echo >&2 "* $1: same as $4"
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echo >&2 " from $3"
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;;
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*,$local)
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echo >&2 "* $1: fast forward to $4"
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echo >&2 " from $3"
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;;
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*)
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false
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;;
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esac || {
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mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
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echo >&2 "* $1: does not fast forward to $4"
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echo >&2 " from $3; leaving it in '$1.remote'"
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}
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else
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echo >&2 "* $1: storing $4"
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echo >&2 " from $3."
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fi
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test -f "$GIT_DIR/$1.lock" &&
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mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
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;;
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rsync://*)
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rsync -L "$merge_repo/$merge_head" "$TMP_HEAD" || exit 1
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esac
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}
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for ref in $(get_remote_refs_for_fetch "$@")
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do
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refs="$refs $ref"
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# These are relative path from $GIT_DIR, typically starting at refs/
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# but may be HEAD
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remote_name=$(expr "$ref" : '\([^:]*\):')
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local_name=$(expr "$ref" : '[^:]*:\(.*\)')
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rref="$rref $remote_name"
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# There are transports that can fetch only one head at a time...
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case "$remote" in
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http://* | https://*)
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if [ -n "$GIT_SSL_NO_VERIFY" ]; then
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curl_extra_args="-k"
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fi
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head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
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expr "$head" : "$_x40\$" >/dev/null ||
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die "Failed to fetch $remote_name from $remote"
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echo Fetching "$remote_name from $remote" using http
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git-http-pull -v -a "$head" "$remote/" || exit
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;;
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rsync://*)
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TMP_HEAD="$GIT_DIR/TMP_HEAD"
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rsync -L "$remote/$remote_name" "$TMP_HEAD" || exit 1
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head=$(git-rev-parse TMP_HEAD)
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rm -f "$TMP_HEAD"
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rsync -avz --ignore-existing "$merge_repo/objects/" "$GIT_OBJECT_DIRECTORY/"
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test "$rsync_slurped_objects" || {
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rsync -avz --ignore-existing "$remote/objects/" \
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"$GIT_OBJECT_DIRECTORY/" || exit
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rsync_slurped_objects=t
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}
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;;
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*)
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# We will do git native transport with just one call later.
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continue ;;
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esac
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append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"
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done
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case "$remote" in
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http://* | https://* | rsync://* )
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;; # we are already done.
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*)
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head=$(git-fetch-pack "$merge_repo" "$merge_head")
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if h=`expr "$head" : '\([^ ][^ ]*\) '`
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then
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head=$h
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fi
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;;
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esac || exit 1
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git-fetch-pack "$remote" $rref |
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while read sha1 remote_name
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do
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found=
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for ref in $refs
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do
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case "$ref" in
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$remote_name:*)
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found="$ref"
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break ;;
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esac
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done
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git-rev-parse --verify "$head" > /dev/null || exit 1
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case "$merge_store" in
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'')
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;;
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*)
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echo "$head" > "$GIT_DIR/$merge_store"
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esac &&
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# FETCH_HEAD is fed to git-resolve-script which will eventually be
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# passed to git-commit-tree as one of the parents. Make sure we do
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# not give a tag object ID.
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git-rev-parse "$head^0" >"$GIT_DIR/FETCH_HEAD"
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local_name=$(expr "$found" : '[^:]*:\(.*\)')
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append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
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done
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;;
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esac
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