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We do not need to call uc() separately for sprintf("%x")
as sprintf("%X") is available.
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
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Subversion 1.7 and newer implement HTTPv2, an extension that should make HTTP
more efficient. Servers with support for this protocol will make the subversion
client library take an alternative code path that checks (with assertions)
whether the URL is "canonical" or not.
This patch fixes an issue I encountered while trying to `git svn dcommit` a
rename action for a file containing a single quote character ("User's Manual"
to "UserMan.tex"). It does not happen for older subversion 1.6 servers nor
non-HTTP(S) protocols such as the native svn protocol, only on an Apache server
shipping SVN 1.7. Trying to `git svn dcommit` under the aforementioned
conditions yields the following error which aborts the commit process:
Committing to http://example.com/svn ...
perl: subversion/libsvn_subr/dirent_uri.c:1520: uri_skip_ancestor:
Assertion `svn_uri_is_canonical(child_uri, ((void *)0))' failed.
error: git-svn died of signal 6
An analysis of the subversion source for the cause:
- The assertion originates from uri_skip_ancestor which calls
svn_uri_is_canonical, which fails when the URL contains percent-encoded values
that do not necessarily have to be encoded (not "canonical" enough). This is
done by a table lookup in libsvn_subr/path.c. Putting some debugging prints
revealed that the character ' is indeed encoded to %27 which is not
considered canonical.
- url_skip_ancestor is called by svn_ra_neon__get_baseline_info with the root
repository URL and path as parameters;
- which is called by copy_resource (libsvn_ra_neon/commit.c) for a copy action
(or in my case, renaming which is actually copy + delete old);
- which is called by commit_add_dir;
- which is assigned as a structure method "add_file" in
svn_ra_neon__get_commit_editor.
In the whole path, the path argument is not modified.
Through some more uninteresting wrapper functions, the Perl bindings gives you
access to the add_file method which will pass the path argument without
modifications to svn.
git-svn calls the "R"(ename) subroutine in Git::SVN::Editor which contains:
326 my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
327 $self->url_path($m->{file_a}), $self->{r});
"repo_path" basically returns the path as-is, unless the "svn.pathnameencoding"
configuration property is set. "url_path" tries to escape some special
characters, but does not take all special characters into account, thereby
causing the path to contain some escaped characters which do not have to be
escaped.
The list of characters not to be escaped are taken from the
subversion/libsvn_subr/path.c file to fully account for all characters. Tested
with a filename containing all characters in the range 0x20 to 0x78 (inclusive).
Signed-off-by: Peter Wu <lekensteyn@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Subversion's canonical URLs are intended to make URL comparison easy
and therefore have strict rules about what characters are special
enough to urlencode and what characters should be left alone.
When in the fallback codepath because unable to use libsvn's own
canonicalization function for some reason, escape special characters
in URIs according to the svn_uri__char_validity[] table in
subversion/libsvn_subr/path.c (r935829). The libsvn versions that
trigger this code path are not likely to be strict enough to care, but
it's nicer to be consistent.
Noticed by using SVN 1.6.17 perl bindings, which do not provide
SVN::_Core::svn_uri_canonicalize (triggering the fallback code),
with libsvn 1.7.5, whose do_switch is fussy enough to care:
Committing to file:///home/jrn/src/git/t/trash%20directory.\
t9118-git-svn-funky-branch-names/svnrepo/pr%20ject/branches\
/more%20fun%20plugin%21 ...
svn: E235000: In file '[...]/subversion/libsvn_subr/dirent_uri.c' \
line 2291: assertion failed (svn_uri_is_canonical(url, pool))
error: git-svn died of signal 6
not ok - 3 test dcommit to funky branch
After this change, the '!' in 'more%20fun%20plugin!' is not urlencoded
and t9118 passes again.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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This shouldn't make a difference because the $deletions hash is
only used when adding a directory (see 379862ec, 2012-02-20) but
it's nice to be consistent to make reading smoother anyway. No
functional change intended.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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git-svn reads usernames and other user queries from an interactive
terminal. This cause GUIs (w/o STDIN connected) to hang waiting forever
for git-svn to complete (http://code.google.com/p/tortoisegit/issues/detail?id=967).
This change extends the Git::prompt helper, so that it can also be used
for non password queries, and makes use of it instead of using
hand-rolled prompt-response code that only works with the interactive
terminal.
Signed-off-by: Sven Strickroth <email@cs-ware.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If GIT_ASKPASS environment variable is not set, git-svn does not try to use
SSH_ASKPASS as git-core does. This change adds a fallback to SSH_ASKPASS.
Signed-off-by: Sven Strickroth <email@cs-ware.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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git-svn reads passwords from an interactive terminal or by using
GIT_ASKPASS helper tool. This cause GUIs (w/o STDIN connected) to hang
waiting forever for git-svn to complete
(http://code.google.com/p/tortoisegit/issues/detail?id=967).
Commit 56a853b62c0ae7ebaad0a7a0a704f5ef561eb795 also tried to solve
this issue, but was incomplete as described above.
Instead of using hand-rolled prompt-response code that only works with the
interactive terminal, a reusable prompt() method is introduced in this commit.
Signed-off-by: Sven Strickroth <email@cs-ware.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Subversion represents symlinks as ordinary files with content starting
with "link " and the svn:special property set to "*". Thus a file can
switch between being a symlink and a non-symlink simply by toggling
its svn:special property, and new checkouts will automatically write a
file of the appropriate type. Likewise, in subversion 1.6 and older,
running "svn update" would notice changes in filetype and update the
working copy appropriately.
Starting in subversion 1.7 (issue 4091), changes to the svn:special
property trip an assertion instead:
$ svn up svn-tree
Updating 'svn-tree':
svn: E235000: In file 'subversion/libsvn_wc/update_editor.c' \
line 1583: assertion failed (action == svn_wc_conflict_action_edit \
|| action == svn_wc_conflict_action_delete || action == \
svn_wc_conflict_action_replace)
Revisions prepared with ordinary svn commands ("svn add" and not "svn
propset") don't trip this because they represent these filetype
changes using a replace operation, which is approximately equivalent
to removal followed by adding a new file and works fine. Follow suit.
Noticed using t9100. After this change, git-svn's file-to-symlink
changes are sent in a format that modern "svn update" can handle and
tests t9100.11-13 pass again.
[ew: s,git-svn\.perl,perl/Git/SVN/Editor.pm,g]
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Subversion's svn_dirent_canonicalize() and svn_path_canonicalize()
APIs keep a leading slash in the return value if one was present on
the argument, which can be useful since it allows relative and
absolute paths to be distinguished.
When git-svn's canonicalize_path() learned to use these functions if
available, its semantics changed in the corresponding way. Some new
callers rely on the leading slash --- for example, if the slash is
stripped out then _canonicalize_url_ourselves() will transform
"proto://host/path/to/resource" to "proto://hostpath/to/resource".
Unfortunately the fallback _canonicalize_path_ourselves(), used when
the appropriate SVN APIs are not usable, still follows the old
semantics, so if that code path is exercised then it breaks. Fix it
to follow the new convention.
Noticed by forcing the fallback on and running tests. Without this
patch, t9101.4 fails:
Bad URL passed to RA layer: Unable to open an ra_local session to \
URL: Local URL 'file://homejrnsrcgit-scratch/t/trash%20directory.\
t9101-git-svn-props/svnrepo' contains unsupported hostname at \
/home/jrn/src/git-scratch/perl/blib/lib/Git/SVN.pm line 148
With it, the git-svn tests pass again.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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All users of $gs->{path} should have been converted to use the
accessor by now. Check our work by renaming the underlying variable
to break callers that try to use it directly.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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The accessors should improve maintainability and enforce
consistent access to Git::SVN objects.
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
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When using the {word,[...]} style of configuration for tags and branches,
it appears the intent is to only match whole path parts, since the words
in the {} pattern are meta-character quoted.
When the pattern word appears in the beginning or middle of the url,
it's matched completely, since the left side, pattern, and (non-empty)
right side are joined together with path separators.
However, when the pattern word appears at the end of the URL, the
right side is an empty pattern, and the resulting regex matches
more than just the specified pattern.
For example, if you specify something along the lines of
branches = branches/project/{release_1,release_2}
and your repository also contains "branches/project/release_1_2", you
will also get the release_1_2 branch. By restricting the match regex
with anchors, this is avoided.
Signed-off-by: Ammon Riley <ammon.riley@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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This fixes a bug where git finds the incorrect merge parent. Consider a
repository with trunk, branch1 of trunk, and branch2 of branch1.
Without this change, git interprets a merge of branch2 into trunk as a
merge of branch1 into trunk.
Signed-off-by: Steven Walter <stevenrwalter@gmail.com>
Reviewed-by: Sam Vilain <sam@vilain.net>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Consider the case where you have trunk, branch1 of trunk, and branch2 of
branch1. trunk is merged back into branch2, and then branch2 is
reintegrated into trunk. The merge of branch2 into trunk will have
svn:mergeinfo property references to both branch1 and branch2. When
git-svn fetches the commit that merges branch2 (check_cherry_pick),
it is necessary to eliminate the merged contents of branch1 as well as
branch2, or else the merge will be incorrectly ignored as a cherry-pick.
Signed-off-by: Steven Walter <stevenrwalter@gmail.com>
Reviewed-by: Sam Vilain <sam@vilain.net>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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A series by Michael Schwern via Eric to update git-svn to revamp the
way URLs are internally passed around, to make it work with SVN 1.7.
* ms/git-svn-1.7:
git-svn: remove ad-hoc canonicalizations
git-svn: canonicalize newly-minted URLs
git-svn: introduce add_path_to_url function
git-svn: canonicalize earlier
git-svn: replace URL escapes with canonicalization
git-svn: attempt to mimic SVN 1.7 URL canonicalization
t9107: fix typo
t9118: workaround inconsistency between SVN versions
Git::SVN{,::Ra}: canonicalize earlier
git-svn: path canonicalization uses SVN API
Git::SVN::Utils: remove irrelevant comment
git-svn: add join_paths() to safely concatenate paths
git-svn: factor out _collapse_dotdot function
git-svn: use SVN 1.7 to canonicalize when possible
git-svn: move canonicalization to Git::SVN::Utils
use Git::SVN{,::RA}->url accessor globally
use Git::SVN->path accessor globally
Git::SVN::Ra: use accessor for URLs
Git::SVN: use accessor for URLs internally
Git::SVN: use accessors internally for path
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Since v1.7.0-rc2~11 (git-svn: persistent memoization, 2010-01-30),
git-svn has maintained some private per-repository caches in
.git/svn/.caches to avoid refetching and recalculating some
mergeinfo-related information with every 'git svn fetch'.
This memoization can cause problems, e.g consider the following case:
SVN repo:
... - a - b - c - m <- trunk
\ /
d - e <- branch1
The Git import of the above repo is at commit 'a' and doesn't know about
the branch1. In case of an 'git svn rebase', only the trunk of the
SVN repo is imported. During the creation of the git commit 'm', git svn
uses the svn:mergeinfo property and tries to find the corresponding git
commit 'e' to create 'm' with 'c' and 'e' as parents. But git svn rebase
only imports the current branch so commit 'e' is not imported.
Therefore git svn fails to create commit 'm' as a merge commit, because one
of its parents is not known to git. The imported history looks like this:
... - a - b - c - m <- trunk
A later 'git svn fetch' to import all branches can't rewrite the commit 'm'
to add 'e' as a parent and to make it a real git merge commit, because it
was already imported.
That's why the imported history misses the merge and looks like this:
... - a - b - c - m <- trunk
\
d - e <- branch1
Right now the only known workaround for importing 'm' as a merge is to
force reimporting 'm' again from SVN, e.g. via
$ git svn reset --revision $(git find-rev $c)
$ git svn fetch
Sadly, this is where the behavior has regressed: git svn reset doesn't
invalidate the old mergeinfo cache, which is no longer valid for the
reimport, which leads to 'm' beeing imprted with only 'c' as parent.
As solution to this problem, this commit invalidates the mergeinfo cache
to force correct recalculation of the parents.
During development of this patch, several ways for invalidating the cache
where considered. One of them is to use Memoize::flush_cache, which will
call the CLEAR method on the underlying Memoize persistency implementation.
Sadly, neither Memoize::Storable nor the newer Memoize::YAML module
introduced in 68f532f4ba888 could optionally be used implement the
CLEAR method, so this is not an option.
Reseting the internal hash used to store the memoized values has the same
problem, because it calls the non-existing CLEAR method of the
underlying persistency layer, too.
Considering this and taking into account the different implementations
of the memoization modules, where Memoize::Storable is not in our control,
implementing the missing CLEAR method is not an option, at least not if
Memoize::Storable is still used.
Therefore the easiest solution to clear the cache is to delete the files
on disk in 'git svn reset'. Normally, deleting the files behind the back
of the memoization module would be problematic, because the in-memory
representation would still exist and contain wrong data. Fortunately, the
memoization is active in memory only for a small portion of the code.
Invalidating the cache by deleting the files on disk if it isn't active
should be safe.
Signed-off-by: Peter Baumann <waste.manager@gmx.de>
Signed-off-by: Steven Walter <stevenrwalter@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Go through all the spots that use the new add_path_to_url() to
make a new URL and canonicalize them.
* copyfrom_path has to be canonicalized else find_parent_branch
will get confused
* due to the `canonicalize_url($full_url) ne $full_url)` line of
logic in gs_do_switch(), $full_url is left alone until after.
At this point SVN 1.7 passes except for 3 tests in
t9100-git-svn-basic.sh that look like an SVN bug to do with
symlinks.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Remove the ad-hoc versions.
This is mostly to normalize the process and ensure the URLs produced
don't have double slashes or anything.
Also provides a place to fix the corner case where a file path
contains a percent sign.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Just a few things I noticed. Its good to canonicalize as early as
possible.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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The old hand-rolled URL escape functions were inferior to
canonicalization functions.
Continuing to move towards getting everything canonicalizing the same way.
* Git::SVN->init_remote_config and Git::SVN::Ra->minimize_url both
have to canonicalize the same way else init_remote_config
will incorrectly think they're different URLs causing
t9107-git-svn-migrate.sh to fail.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Previously, our URL canonicalization didn't do much of anything.
Now it actually escapes and collapses slashes. This is mostly a cut & paste
of escape_url from git-svn.
This is closer to how SVN 1.7's canonicalization behaves. Doing it with
1.6 lets us chase down some problems caused by more effective canonicalization
without having to deal with all the other 1.7 issues on top of that.
* Remote URLs have to be canonicalized otherwise Git::SVN->find_existing_remote
will think they're different.
* The SVN remote is now written to the git config canonicalized. That
should be ok. Adjust a test to account for that.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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This canonicalizes paths and urls as early as possible so we don't
have to remember to do it at the point of use. It will fix a swath
of SVN 1.7 problems in one go.
Its ok to double canonicalize things.
SVN 1.7 still fails, still not worrying about that.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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All tests pass with SVN 1.6. SVN 1.7 remains broken, not worrying
about it yet.
SVN changed its path canonicalization API between 1.6 and 1.7.
http://svnbook.red-bean.com/en/1.6/svn.developer.usingapi.html#svn.developer.usingapi.urlpath
http://svnbook.red-bean.com/en/1.7/svn.developer.usingapi.html#svn.developer.usingapi.urlpath
The SVN API does not accept foo/.. but it also doesn't canonicalize
it. We have to do it ourselves.
[ew: commit title, fall back if SVN <= 1.6 fails to canonicalize]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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The code doesn't use File::Spec.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Otherwise you might wind up with things like...
my $path1 = undef;
my $path2 = 'foo';
my $path = $path1 . '/' . $path2;
creating '/foo'. Or this...
my $path1 = 'foo/';
my $path2 = 'bar';
my $path = $path1 . '/' . $path2;
creating 'foo//bar'.
Could have used File::Spec, but I'm shying away from it due to SVN
1.7's pickiness about paths. Felt it would be better to have our own
we can control completely.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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The SVN API functions will not accept ../foo but their canonicalization
functions will not collapse it. So we'll have to do it ourselves.
_collapse_dotdot() works better than the existing regex did.
This will be used shortly when canonicalize_path() starts using the
SVN API.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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No change on SVN 1.6. The tests all pass with SVN 1.6 if
canonicalize_url() does nothing, so tests passing doesn't have
much meaning.
The tests are so messed up right now with SVN 1.7 it isn't really
useful to check. They will be useful later.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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So they can be used by others.
I'd like to test them, but they're going to become SVN API wrappers shortly
and those aren't predictable.
No functional change.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Note: The structure returned from Git::SVN->read_all_remotes() does not
appear to contain objects, so I'm leaving them alone.
That's everything converted over to the url and path accessors.
No functional change.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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No functional change.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Later it can canonicalize automatically.
A later change will make other things use the accessor.
No functional change.
[ew: commit title, reformatted accessor to match existing style]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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So later it can do automatic canonicalization.
A later patch will make other things use the accessor.
No functional change here.
[ew: commit title]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Then later it can be canonicalized automatically rather than everywhere
its used.
Later patch will make other things use it.
[ew: commit title, reformatted accessor to match existing style]
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Straight cut & paste. That's the last class.
* Make Git::SVN load it on its own, its the only thing that needs it.
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Straight cut & paste. Didn't require any fixing.
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Straight cut & paste.
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Straight cut & paste.
Also noticed Git::SVN::Ra wasn't in the compile test. It is now.
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Also it can compile on its own now, yay!
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Except for adding the 1; at the end, this is a straight copy & paste.
Tests still pass, but its doubtful Git::SVN will compile on its own
without git-svn being loaded. Next commit will fix that.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Put them in a new module called Git::SVN::Utils. Yeah, not terribly
original and it will be a dumping ground. But its better than having
them in the main git-svn program. At least they can be documented
and tested.
* fatal() is used by many classes.
* Change the $can_compress lexical into a function.
This should be enough to extract Git::SVN.
Signed-off-by: Michael G. Schwern <schwern@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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While Makefile.PL now finds .pm files on its own, it does not
detect new files after it generates perl/perl.mak.
[ew: commit message, minor tweaks]
ref: http://mid.gmane.org/7vlii51xz4.fsf@alter.siamese.dyndns.org
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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It is no longer necessary to manually add new .pm files to the
Makefile.PL. This makes it easier to add modules.
It is still necessary to add them to the Makefile, but that extra work
should be removed at a future date.
Signed-off-by: Michael G Schwern <schwern@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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In older Perls, sometimes $@ can become unset between the eval and
checking $@. Its safer to check the eval directly.
Signed-off-by: Michael G Schwern <schwern@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Usually it isn't, but its nice if it can be run with warnings on.
Signed-off-by: Michael G Schwern <schwern@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Acked-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In the NO_PERL_MAKEMAKER=YesPlease fallback case, make the directory
that will contain each module when installing it (simulating "install
-D") instead of hardcoding "Git/SVN/Memoize is the deepest level".
This should make this codepath which is not used often on development
machines a little easier to maintain.
Requested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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v1.7.11-rc1~12^2~2 (2012-05-27) and friends split some git-svn code
into separate modules but did not update the fallback rules to install
them when NO_PERL_MAKEMAKER is set. Add the appropriate rules so
users without MakeMaker can use git-svn again.
Affected modules: Git::SVN::Prompt, Git::SVN::Fetcher,
Git::SVN::Editor, Git::SVN::Ra, Git::SVN::Memoize::YAML.
Reported-by: Adam Roben <adam@roben.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmali.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Adding or removing a module requires modifying both files to support
builds with and without MakeMaker. Add a comment to remind patch
authors and reviewers at the crucial moment.
Longer term, it would be nicer to maintain a single list, perhaps in a
separate file used by both build systems.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Since v1.7.0-rc2~11 (git-svn: persistent memoization, 2010-01-30),
git-svn has maintained some private per-repository caches in
.git/svn/.caches to avoid refetching and recalculating some
mergeinfo-related information with every "git svn fetch".
These caches use the 'nstore' format from the perl core module
Storable, which can be read and written quickly and was designed for
transfer over the wire (the 'n' stands for 'network'). This format is
endianness-independent and independent of floating-point
representation.
Unfortunately the format is *not* independent of the perl version ---
new perl versions will write files that very old perl cannot read.
Worse, the format is not independent of the size of a perl integer.
So if you toggle perl's use64bitint compile-time option, then using
'git svn fetch' on your old repositories produces errors like this:
Byte order is not compatible at ../../lib/Storable.pm (autosplit
into ../../lib/auto/Storable/_retrieve.al) line 380, at
/usr/share/perl/5.12/Memoize/Storable.pm line 21
That is, upgrading perl to a version that uses use64bitint for the
first time makes git-svn suddenly refuse to fetch in existing
repositories. Removing .git/svn/.caches lets git-svn recover.
It's time to switch to a platform independent serializer backend with
better compatibility guarantees. This patch uses YAML::Any.
Other choices were considered:
- thawing data from Data::Dumper involves "eval". Doing that without
creating a security risk is fussy.
- the JSON API works on scalars in memory and doesn't provide a
standard way to serialize straight to disk.
YAML::Any is reasonably fast and has a pleasant API. In most
backends, LoadFile() reads the entire file into a scalar anyway and
converts it as a second step, but having an interface that allows the
deserialization to happen on the fly without a temporary is still a
comfort.
YAML::Any is not a core perl module, so we take care to use it when
and only when it is available. Installations without that module
should fall back to using Storable with all its quirks, keeping their
cache files in
.git/svn/.caches/*.db
Installations with YAML peacefully coexist by keeping a separate set
of cache files in
.git/svn/.caches/*.yaml.
In most cases, switching between is a one-time thing, so it doesn't
seem worth the complication to migrate existing caches.
The upshot: after this patch, as long as YAML::Any is installed you
can move your git repository between machines with different perl
installations and "git svn fetch" will work fine. If you do not have
YAML::Any, the behavior is unchanged (and in particular does not get
any worse).
Reported-by: Sandro Weiser <sandro.weiser@informatik.tu-chemnitz.de>
Reported-by: Bdale Garbee <bdale@gag.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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