On Tue, May 6, 2014 at 12:15 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Ronnie Sahlberg <sahlberg@xxxxxxxxxx> writes:
>
>> It currently has a hard assumption that the loose ref file must exist at this
>> stage or else it would end up deleting the reflog which is true today, as far
>> as I can tell, but would break if git would change such that we could have
>> a branch checked out without having a loose ref file for that branch.
>
> Hmmmm. Do you mean this sequence will break?
As Michael suggested, this is already broken :-(
This sequence will delete the reflog from master :
$ git init-db
$ git config core.logallrefupdates true
$ git commit -m Initial --allow-empty
[master (root-commit) bb11abe] Initial
$ git reflog master
[8561dcb master@{0}: commit (initial): Initial]
$ find .git/{refs,logs} -type f | grep master
[.git/refs/heads/master]
[.git/logs/refs/heads/master]
$ git branch foo
$ git pack-refs --all
$ find .git/{refs,logs} -type f | grep master
[.git/logs/refs/heads/master]
$ git checkout foo
$ find .git/{refs,logs} -type f | grep master
... reflog file is missing ...
$ git reflog master
... nothing ...
I am adding a test for this in the next set of patches :
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index 236b13a..8cab06f 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -245,4 +245,12 @@ test_expect_success 'gc.reflogexpire=false' '
'
+test_expect_success 'checkout should not delete log for packed ref' '
+ test $(git reflog master | wc -l) = 4 &&
+ git branch foo &&
+ git pack-refs --all &&
+ git checkout foo &&
+ test $(git reflog master | wc -l) = 4
+'
+
test_done
>
> : gitster x; git init lo
> Initialized empty Git repository in /var/tmp/x/lo/.git/
> : gitster x; cd lo
> : gitster lo/master; git commit --allow-empty -m initial
> [master (root-commit) db2b430] initial
> : gitster lo/master; git branch next
>
> Now we have two branches, master and next, and we are on master.
>
> : gitster lo/master; git pack-refs --all
> : gitster lo/master; ls .git/refs/heads
> ./ ../
> : gitster lo/master; cat .git/packed-refs
> # pack-refs with: peeled fully-peeled
> db2b43072749258d1e3c119c9570349d77c26b3a refs/heads/master
> db2b43072749258d1e3c119c9570349d77c26b3a refs/heads/next
>
> And loose refs are fully packed.
>
> : gitster lo/master; git checkout next
> Switched to branch 'next'
> : gitster lo/next; ls .git/refs/heads
> ./ ../
>
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