windows: degrade to py2 behavior when reading a non-symlink as a symlink
While waiting for the push to hg-committed in WSL to complete, I ran a
`phabimport` from Windows and got this traceback:
$ hg phabimport 11313
** Unknown exception encountered with possibly-broken third-party extension "mercurial_keyring" (version N/A)
** which supports versions unknown of Mercurial.
** Please disable "mercurial_keyring" and try your action again.
** If that fixes the bug please report it to https://foss.heptapod.net/mercurial/mercurial_keyring/issues
** Python 3.9.5 (default, May 6 2021, 17:29:31) [MSC v.1928 64 bit (AMD64)]
** Mercurial Distributed SCM (version 5.9rc1+hg32.
0e2f5733563d)
** Extensions loaded: absorb, blackbox, evolve 10.3.3, extdiff, fastannotate, fix, mercurial_keyring, mq, phabblocker
20210126, phabricator, rebase, show, strip, topic 0.22.3
Traceback (most recent call last):
File "mercurial.lock", line 279, in _trylock
File "mercurial.vfs", line 202, in makelock
File "mercurial.util", line 2147, in makelock
FileExistsError: [WinError 183] Cannot create a file when that file already exists: b'hp-omen:78348' -> b'C:\\Users\\Matt\\hg/.hg/store/lock'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<string>", line 24, in <module>
File "mercurial.dispatch", line 144, in run
File "mercurial.dispatch", line 250, in dispatch
File "mercurial.dispatch", line 294, in _rundispatch
File "mercurial.dispatch", line 470, in _runcatch
File "mercurial.dispatch", line 480, in _callcatch
File "mercurial.scmutil", line 153, in callcatch
File "mercurial.dispatch", line 460, in _runcatchfunc
File "mercurial.dispatch", line 1273, in _dispatch
File "mercurial.dispatch", line 918, in runcommand
File "mercurial.dispatch", line 1285, in _runcommand
File "mercurial.dispatch", line 1271, in <lambda>
File "mercurial.util", line 1886, in check
File "mercurial.util", line 1886, in check
File "hgext.mq", line 4239, in mqcommand
File "mercurial.util", line 1886, in check
File "mercurial.util", line 1886, in check
File "hgext.phabricator", line 314, in inner
File "hgext.phabricator", line 2222, in phabimport
File "hgext.phabricator", line 2123, in readpatch
File "hgext.phabricator", line 2199, in _write
File "mercurial.localrepo", line 2956, in lock
File "mercurial.localrepo", line 2918, in _lock
File "mercurial.lock", line 152, in trylock
File "mercurial.lock", line 283, in _trylock
File "mercurial.lock", line 314, in _readlock
File "mercurial.vfs", line 221, in readlock
File "mercurial.util", line 2163, in readlock
File "mercurial.windows", line 619, in readlink
ValueError: not a symbolic link
Both exceptions look accurate (the file exists, and the Windows side can't read
WSL side symlinks). I didn't try to reproduce this entirely within the Windows
side, but we can do better than a cryptic stacktrace. With this change, the
same scenario results in this abort:
abort: C:\Users\Matt\hg/.hg/store/lock: The file cannot be accessed by the system
When both the `push` and `phabimport` are done on the Windows side, it prints a
message about waiting for the lock, and successfully applies the patch after the
push completes.
I'm not sure if there's enough info to be able to convert the abort into the
wait scenario. As it stands now, we don't support symlinks on Windows, which
requires either a UAC Administrator level process or an opt-in in developer
mode, and there are several places where the new symlink on Windows support in
py3 was explicitly disabled in order to get tests to pass quicker.
Differential Revision: https://phab.mercurial-scm.org/D11333
#require no-windows
$ . "$TESTDIR/remotefilelog-library.sh"
$ hg init master
$ cd master
$ cat >> .hg/hgrc <<EOF
> [remotefilelog]
> server=True
> EOF
$ echo x > x
$ echo y > y
$ hg commit -qAm x
$ hg serve -p $HGPORT -d --pid-file=../hg1.pid -E ../error.log -A ../access.log
Build a query string for later use:
$ GET=`hg debugdata -m 0 | "$PYTHON" -c \
> 'import sys ; print([("?cmd=x_rfl_getfile&file=%s&node=%s" % tuple(s.split("\0"))) for s in sys.stdin.read().splitlines()][0])'`
$ cd ..
$ cat hg1.pid >> $DAEMON_PIDS
$ hgcloneshallow http://localhost:$HGPORT/ shallow -q
2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over *s (glob)
$ grep getfile access.log
* "GET /?cmd=batch HTTP/1.1" 200 - x-hgarg-1:cmds=x_rfl_getfile+*node%3D1406e74118627694268417491f018a4a883152f0* (glob)
Clear filenode cache so we can test fetching with a modified batch size
$ rm -r $TESTTMP/hgcache
Now do a fetch with a large batch size so we're sure it works
$ hgcloneshallow http://localhost:$HGPORT/ shallow-large-batch \
> --config remotefilelog.batchsize=1000 -q
2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over *s (glob)
The 'remotefilelog' capability should *not* be exported over http(s),
as the getfile method it offers doesn't work with http.
$ get-with-headers.py localhost:$HGPORT '?cmd=capabilities' | grep lookup | identifyrflcaps
x_rfl_getfile
x_rfl_getflogheads
$ get-with-headers.py localhost:$HGPORT '?cmd=hello' | grep lookup | identifyrflcaps
x_rfl_getfile
x_rfl_getflogheads
$ get-with-headers.py localhost:$HGPORT '?cmd=this-command-does-not-exist' | head -n 1
400 no such method: this-command-does-not-exist
$ get-with-headers.py localhost:$HGPORT '?cmd=x_rfl_getfiles' | head -n 1
400 no such method: x_rfl_getfiles
Verify serving from a shallow clone doesn't allow for remotefile
fetches. This also serves to test the error handling for our batchable
getfile RPC.
$ cd shallow
$ hg serve -p $HGPORT1 -d --pid-file=../hg2.pid -E ../error2.log
$ cd ..
$ cat hg2.pid >> $DAEMON_PIDS
This GET should work, because this server is serving master, which is
a full clone.
$ get-with-headers.py localhost:$HGPORT "$GET"
200 Script output follows
0\x00x\x9c3b\xa8\xe0\x12a{\xee(\x91T6E\xadE\xdcS\x9e\xb1\xcb\xab\xc30\xe8\x03\x03\x91 \xe4\xc6\xfb\x99J,\x17\x0c\x9f-\xcb\xfcR7c\xf3c\x97r\xbb\x10\x06\x00\x96m\x121 (no-eol) (esc)
This GET should fail using the in-band signalling mechanism, because
it's not a full clone. Note that it's also plausible for servers to
refuse to serve file contents for other reasons, like the file
contents not being visible to the current user.
$ get-with-headers.py localhost:$HGPORT1 "$GET"
200 Script output follows
1\x00cannot fetch remote files from shallow repo (no-eol) (esc)
Clones should work with httppostargs turned on
$ cd master
$ hg --config experimental.httppostargs=1 serve -p $HGPORT2 -d --pid-file=../hg3.pid -E ../error3.log
$ cd ..
$ cat hg3.pid >> $DAEMON_PIDS
Clear filenode cache so we can test fetching with a modified batch size
$ rm -r $TESTTMP/hgcache
$ hgcloneshallow http://localhost:$HGPORT2/ shallow-postargs -q
2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over *s (glob)
All error logs should be empty:
$ cat error.log
$ cat error2.log
$ cat error3.log