hg: obtain lock when creating share from pooled repo (
issue5104)
There are race conditions between clients performing a shared clone
to pooled storage:
1) Clients race to create the new shared repo in the pool directory
2) 1 client is seeding the repo in the pool directory and another goes
to share it before it is fully cloned
We prevent these race conditions by obtaining a lock in the pool
directory that is derived from the name of the repo we will be
accessing.
To test this, a simple generic "lockdelay" extension has been added.
The extension inserts an optional, configurable delay before or after
lock acquisition. In the test, we delay 2 seconds after lock acquisition
in the first process and 1 second before lock acquisition in the 2nd
process. This means the first process has 1s to obtain the lock. There
is a race condition here. If we encounter it in the wild, we could
change the dummy extension to wait on the lock file to appear instead
of relying on timing. But that's more complicated. Let's see what
happens first.
$ remove() {
> hg rm $@
> echo "exit code: $?"
> hg st
> # do not use ls -R, which recurses in .hg subdirs on Mac OS X 10.5
> find . -name .hg -prune -o -type f -print | sort
> hg up -C
> }
$ hg init a
$ cd a
$ echo a > foo
file not managed
$ remove foo
not removing foo: file is untracked
exit code: 1
? foo
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg add foo
$ hg commit -m1
the table cases
00 state added, options none
$ echo b > bar
$ hg add bar
$ remove bar
not removing bar: file has been marked for add (use forget to undo)
exit code: 1
A bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
01 state clean, options none
$ remove foo
exit code: 0
R foo
? bar
./bar
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
02 state modified, options none
$ echo b >> foo
$ remove foo
not removing foo: file is modified (use -f to force removal)
exit code: 1
M foo
? bar
./bar
./foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
03 state missing, options none
$ rm foo
$ remove foo
exit code: 0
R foo
? bar
./bar
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
10 state added, options -f
$ echo b > bar
$ hg add bar
$ remove -f bar
exit code: 0
? bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm bar
11 state clean, options -f
$ remove -f foo
exit code: 0
R foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
12 state modified, options -f
$ echo b >> foo
$ remove -f foo
exit code: 0
R foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
13 state missing, options -f
$ rm foo
$ remove -f foo
exit code: 0
R foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
20 state added, options -A
$ echo b > bar
$ hg add bar
$ remove -A bar
not removing bar: file still exists
exit code: 1
A bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
21 state clean, options -A
$ remove -A foo
not removing foo: file still exists
exit code: 1
? bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
22 state modified, options -A
$ echo b >> foo
$ remove -A foo
not removing foo: file still exists
exit code: 1
M foo
? bar
./bar
./foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
23 state missing, options -A
$ rm foo
$ remove -A foo
exit code: 0
R foo
? bar
./bar
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
30 state added, options -Af
$ echo b > bar
$ hg add bar
$ remove -Af bar
exit code: 0
? bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm bar
31 state clean, options -Af
$ remove -Af foo
exit code: 0
R foo
./foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
32 state modified, options -Af
$ echo b >> foo
$ remove -Af foo
exit code: 0
R foo
./foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
33 state missing, options -Af
$ rm foo
$ remove -Af foo
exit code: 0
R foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
test some directory stuff
$ mkdir test
$ echo a > test/foo
$ echo b > test/bar
$ hg ci -Am2
adding test/bar
adding test/foo
dir, options none
$ rm test/bar
$ remove test
removing test/bar (glob)
removing test/foo (glob)
exit code: 0
R test/bar
R test/foo
./foo
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -f
$ rm test/bar
$ remove -f test
removing test/bar (glob)
removing test/foo (glob)
exit code: 0
R test/bar
R test/foo
./foo
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -A
$ rm test/bar
$ remove -A test
not removing test/foo: file still exists (glob)
removing test/bar (glob)
exit code: 1
R test/bar
./foo
./test/foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -Af
$ rm test/bar
$ remove -Af test
removing test/bar (glob)
removing test/foo (glob)
exit code: 0
R test/bar
R test/foo
./foo
./test/foo
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
test remove dropping empty trees (issue1861)
$ mkdir -p issue1861/b/c
$ echo x > issue1861/x
$ echo y > issue1861/b/c/y
$ hg ci -Am add
adding issue1861/b/c/y
adding issue1861/x
$ hg rm issue1861/b
removing issue1861/b/c/y (glob)
$ hg ci -m remove
$ ls issue1861
x
test that commit does not crash if the user removes a newly added file
$ touch f1
$ hg add f1
$ rm f1
$ hg ci -A -mx
removing f1
nothing changed
[1]
handling of untracked directories and missing files
$ mkdir d1
$ echo a > d1/a
$ hg rm --after d1
not removing d1: no tracked files
[1]
$ hg add d1/a
$ rm d1/a
$ hg rm --after d1
removing d1/a (glob)
#if windows
$ hg rm --after nosuch
nosuch: * (glob)
[1]
#else
$ hg rm --after nosuch
nosuch: No such file or directory
[1]
#endif