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authorShawn O. Pearce <spearce@spearce.org>2007-11-11 07:29:47 (GMT)
committerJunio C Hamano <gitster@pobox.com>2007-11-12 01:09:55 (GMT)
commit4191c35671f6392173221bea3994f8b305f4f3a8 (patch)
tree25d2b9c69692a73416eb6004663649a3ce8f2d6b /t/t5502-quickfetch.sh
parent27350891de59608d4db689cf0851f7e49158a6e3 (diff)
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git-fetch: avoid local fetching from alternate (again)
Back in e3c6f240fd9c5bdeb33f2d47adc859f37935e2df Junio taught git-fetch to avoid copying objects when we are fetching from a repository that is already registered as an alternate object database. In such a case there is no reason to copy any objects as we can already obtain them through the alternate. However we need to ensure the objects are all reachable, so we run `git rev-list --objects $theirs --not --all` to verify this. If any object is missing or unreadable then we need to fetch/copy the objects from the remote. When a missing object is detected the git-rev-list process will exit with a non-zero exit status, making this condition quite easy to detect. Although git-fetch is currently a builtin (and so is rev-list) we cannot invoke the traverse_objects() API at this point in the transport code. The object walker within traverse_objects() calls die() as soon as it finds an object it cannot read. If that happens we want to resume the fetch process by calling do_fetch_pack(). To get around this we spawn git-rev-list into a background process to prevent a die() from killing the foreground fetch process, thus allowing the fetch process to resume into do_fetch_pack() if copying is necessary. We aren't interested in the output of rev-list (a list of SHA-1 object names that are reachable) or its errors (a "spurious" error about an object not being found as we need to copy it) so we redirect both stdout and stderr to /dev/null. We run this git-rev-list based check before any fetch as we may already have the necessary objects local from a prior fetch. If we don't then its very likely the first $theirs object listed on the command line won't exist locally and git-rev-list will die very quickly, allowing us to start the network transfer. This test even on remote URLs may save bandwidth if someone runs `git pull origin`, sees a merge conflict, resets out, then redoes the same pull just a short time later. If the remote hasn't changed between the two pulls and the local repository hasn't had git-gc run in it then there is probably no need to perform network transfer as all of the objects are local. Documentation for the new quickfetch function was suggested and written by Junio, based on his original comment in git-fetch.sh. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Diffstat (limited to 't/t5502-quickfetch.sh')
-rwxr-xr-xt/t5502-quickfetch.sh33
1 files changed, 33 insertions, 0 deletions
diff --git a/t/t5502-quickfetch.sh b/t/t5502-quickfetch.sh
index b4760f2..16eadd6 100755
--- a/t/t5502-quickfetch.sh
+++ b/t/t5502-quickfetch.sh
@@ -86,4 +86,37 @@ test_expect_success 'quickfetch should not leave a corrupted repository' '
'
+test_expect_success 'quickfetch should not copy from alternate' '
+
+ (
+ mkdir quickclone &&
+ cd quickclone &&
+ git init-db &&
+ (cd ../.git/objects && pwd) >.git/objects/info/alternates &&
+ git remote add origin .. &&
+ git fetch -k -k
+ ) &&
+ obj_cnt=$( (
+ cd quickclone &&
+ git count-objects | sed -e "s/ *objects,.*//"
+ ) ) &&
+ pck_cnt=$( (
+ cd quickclone &&
+ git count-objects -v | sed -n -e "/packs:/{
+ s/packs://
+ p
+ q
+ }"
+ ) ) &&
+ origin_master=$( (
+ cd quickclone &&
+ git rev-parse origin/master
+ ) ) &&
+ echo "loose objects: $obj_cnt, packfiles: $pck_cnt" &&
+ test $obj_cnt -eq 0 &&
+ test $pck_cnt -eq 0 &&
+ test z$origin_master = z$(git rev-parse master)
+
+'
+
test_done