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2008-05-29unpack_trees(): allow callers to differentiate worktree errors from merge errorsLibravatar Junio C Hamano1-3/+7
Instead of uniformly returning -1 on any error, this teaches unpack_trees() to return -2 when the merge itself is Ok but worktree refuses to get updated. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-05-19unpack-trees: allow Porcelain to give different error messagesLibravatar Junio C Hamano1-14/+41
The plumbing output is sacred as it is an API. We _could_ change it if it is broken in such a way that it cannot convey necessary information fully, but we just do not _reword_ for the sake of rewording. If somebody does not like it, s/he is complaining too late. S/he should have been here in early May 2005 and make the language used by the API closer to what humans read. S/he wasn't here. Too bad, and it is too late. And people who complain should look at a bigger picture. Look at what was suggested by one of them and think for five seconds: $ git checkout mytopic -fatal: Entry 'frotz' not uptodate. Cannot merge. +fatal: Entry 'frotz' has local changes. Cannot merge. If you do not see something wrong with this output, your brain has already been rotten with use of git for too long a time. Nobody asked us to "merge" but why are we talking about "Cannot merge"? This patch introduces a mechanism to allow Porcelains to specify messages that are different from the ones that is given by the underlying plumbing implementation of read-tree, so that we can reword the message Porcelains give without disrupting the output from the plumbing. $ git-checkout pu error: You have local changes to 'Makefile'; cannot switch branches. There are other places that ask unpack_trees() to n-way merge, detect issues and let it issue error message on its own, but I did this as a demonstration and replaced only one message. Yes I know about C99 structure initializers. I'd love to use them but we try to be nice to compilers without it. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-05-10Optimize symlink/directory detectionLibravatar Linus Torvalds1-7/+5
This is the base for making symlink detection in the middle fo a pathname saner and (much) more efficient. Under various loads, we want to verify that the full path leading up to a filename is a real directory tree, and that when we successfully do an 'lstat()' on a filename, we don't get a false positive due to a symlink in the middle of the path that git should have seen as a symlink, not as a normal path component. The 'has_symlink_leading_path()' function already did this, and cached a single level of symlink information, but didn't cache the _lack_ of a symlink, so the normal behaviour was actually the wrong way around, and we ended up doing an 'lstat()' on each path component to check that it was a real directory. This caches the last detected full directory and symlink entries, and speeds up especially deep directory structures a lot by avoiding to lstat() all the directories leading up to each entry in the index. [ This can - and should - probably be extended upon so that we eventually never do a bare 'lstat()' on any path entries at *all* when checking the index, but always check the full path carefully. Right now we do not generally check the whole path for all our normal quick index revalidation. We should also make sure that we're careful about all the invalidation, ie when we remove a link and replace it by a directory we should invalidate the symlink cache if it matches (and vice versa for the directory cache). But regardless, the basic function needs to be sane to do that. The old 'has_symlink_leading_path()' was not capable enough - or indeed the code readable enough - to really do that sanely. So I'm pushing this as not just an optimization, but as a base for further work. ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-04-09Make unpack-tree update removed files before any updated filesLibravatar Linus Torvalds1-2/+7
This is immaterial on sane filesystems, but if you have a broken (aka case-insensitive) filesystem, and the objective is to remove the file 'abc' and replace it with the file 'Abc', then we must make sure to do the removal first. Otherwise, you'd first update the file 'Abc' - which would just overwrite the file 'abc' due to the broken case-insensitive filesystem - and then remove file 'abc' - which would now brokenly remove the just updated file 'Abc' on that broken filesystem. By doing removals first, this won't happen. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-04-09Make branch merging aware of underlying case-insensitive filsystemsLibravatar Linus Torvalds1-0/+26
If we find an unexpected file, see if that filename perhaps exists in a case-insensitive way in the index, and whether the file matches that. If so, ignore it as a known pre-existing file of a different name. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-04-09Make hash_name_lookup able to do case-independent lookupsLibravatar Linus Torvalds1-1/+1
Right now nobody uses it, but "index_name_exists()" gets a flag so you can enable it on a case-by-case basis. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-04-09Make "index_name_exists()" return the cache_entry it foundLibravatar Linus Torvalds1-4/+4
This allows verify_absent() in unpack_trees() to use the hash chains rather than looking it up using the binary search. Perhaps more importantly, it's also going to be useful for the next phase, where we actually start looking at the cache entry when we do case-insensitive lookups and checking the result. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-18Fix read-tree not to discard errorsLibravatar Junio C Hamano1-3/+6
This fixes the issue identified with recently added tests to t1004 Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-16Don't update unchanged merge entriesLibravatar Linus Torvalds1-3/+6
In commit 34110cd4e394e3f92c01a4709689b384c34645d8 ("Make 'unpack_trees()' have a separate source and destination index") I introduced a really stupid bug in that it would always add merged entries with the CE_UPDATE flag set. That caused us to always re-write the file, even when it was already up-to-date in the source index. Not only is that really stupid from a performance angle, but more importantly it's actively wrong: if we have dirty state in the tree when we merge, overwriting it with the result of the merge will incorrectly overwrite that dirty state. This trivially fixes the problem - simply don't set the CE_UPDATE flag when the merge result matches the old state. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-14Fix recent 'unpack_trees()'-related changes breaking 'git stash'Libravatar Linus Torvalds1-0/+2
On Sat, 15 Mar 2008, SZEDER G?bor wrote: > > The testcase usually fails during the first 25 run, but sometimes it > runs more than 100 times before failing. Damn, this series has had more subtle issues than I ever expected. 'git stash' creates its saved working tree object with: # state of the working tree w_tree=$( ( rm -f "$TMP-index" && cp -p ${GIT_INDEX_FILE-"$GIT_DIR/index"} "$TMP-index" && GIT_INDEX_FILE="$TMP-index" && export GIT_INDEX_FILE && git read-tree -m $i_tree && git add -u && git write-tree && rm -f "$TMP-index" ) ) || die "Cannot save the current worktree state" which creates a new index file with the updates, and writes the tree from that. We have this logic where we compare the timestamp of the index with the timestamp of the files and we then write them out "smudged" if they are the same, and it basically depends on the fact that the date on the index file is compared with the date encoded in the stat information itself. And what is going on is: - we create a new index file with that "cp". We are careful to preserve the timestamps by using "-p", so this one should be all ok. - then we *update* that index by resetting it to the tree with git read-tree, but now we do *not* preserve the timestamp on this new copy any more, even though we copy over all the timestamps on the files that are indexed from the stat information! Now, we always had that problem when re-writing the index, but we had this clever workaround in the writing part: if the source had racily clean entries, then when we wrote those out (and thus can't depend on the index fiel timestamp showing that they are racily clean any more!), we would smudge them when writing. IOW, we handle this issue by having write_index() do this: for (i = 0; i < entries; i++) { ... if (is_racy_timestamp(istate, ce)) ce_smudge_racily_clean_entry(ce); .. when writing out entries. And that all took care of it, because now when we wrote the new index, we'd change the timestamp on the index, yes, but we'd smudge the entries we wrote out, so now the resulting index would still show that file as not-up-to-date any more. But with commit 34110cd4e394e3f92c01a4709689b384c34645d8 ("Make 'unpack_trees()' have a separate source and destination index"), this logic no longer triggers, because we now write out the "result" index, and that one never got its timestamp updated from the source index, so it had lost all that "is_racy_timestamp()" information! This trivial patch fixes it. It looks trivial, and it's a simple fix, but boy did it take me way too much thinking and explaining to myself to explain why there was a problem in the first place! The trivial fix is to just copy the index timestamp from the source index into the result index. But we only do this if we *have* a source index, of course, and if we will even bother to use the result. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-13read-tree() and unpack_trees(): use consistent limitLibravatar Junio C Hamano1-3/+3
read-tree -m can read up to MAX_TREES, which was arbitrarily set to 8 since August 2007 (4 is needed to deal with 2 merge-base case). However, the updated unpack_trees() code had an advertised limit of 4 (which it enforced). In reality the code was prepared to take only 3 trees and giving 4 caused it to stomp on its stack. Rename the MAX_TREES constant to MAX_UNPACK_TREES, move it to the unpack-trees.h common header file, and use it from both places to avoid future confusion. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-10unpack_trees(): fix diff-index regression.Libravatar Linus Torvalds1-2/+0
When skip_unmerged option is not given, unpack_trees() should not just skip unmerged cache entries but keep them in the result for the caller to sort them out. For callers other than diff-index, the incoming index should never be unmerged, but diff-index is a special case caller. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-10traverse_trees_recursive(): propagate merge errors upLibravatar Junio C Hamano1-3/+4
There were few places where merge errors detected deeper in the call chain were ignored and not propagated up the callchain to the caller. Most notably, this caused switching branches with "git checkout" to ignore a path modified in a work tree are different between the HEAD version and the commit being switched to, which it internally notices but ignores it, resulting in an incorrect two-way merge and loss of the change in the work tree. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-09unpack_trees(): minor memory leak fix in unused destination indexLibravatar Linus Torvalds1-0/+1
This adds a "discard_index(&o->result)" to the failure path, to reclaim memory from an in-core index we built but ended up not using. The *big* memory leak comes from the fact that we leak the cache_entry things left and right. That's a very traditional and deliberate leak: because we used to build up the cache entries by just mapping them directly in from the index file (and we emulate that in modern times by allocating them from one big array), we can't actually free them one-by-one. So doing the "discard_index()" will free the hash tables etc, which is good, and it will free the "istate->alloc" but that is never set on the result because we don't get the result from the index read. So we don't actually free the individual cache entries themselves that got created from the trees. That's not something new, btw. We never did. But some day we should just add a flag to the cache_entry() that it's a "free one by one" kind, and then we could/should do it. In the meantime, this one-liner will fix *some* of the memory leaks, but not that old traditional one. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-09Make 'unpack_trees()' have a separate source and destination indexLibravatar Linus Torvalds1-77/+72
We will always unpack into our own internal index, but we will take the source from wherever specified, and we will optionally write the result to a specified index (optionally, because not everybody even _wants_ any result: the index diffing really wants to just walk the tree and index in parallel). This ends up removing a fair number more lines than it adds, for the simple reason that we can now skip all the crud that tried to be oh-so-careful about maintaining our position in the index as we were traversing and modifying it. Since we don't actually modify the source index any more, we can just update the 'o->pos' pointer without worrying about whether an index entry got removed or replaced or added to. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-09Make 'unpack_trees()' take the index to work on as an argumentLibravatar Linus Torvalds1-39/+40
This is just a very mechanical conversion, and makes everybody set it to '&the_index' before calling, but at least it makes it more explicit where we work with the index. The next stage would be to split that index usage up into a 'source' and a 'destination' index, so that we can unpack into a different index than we started out from. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-09Move 'unpack_trees()' over to 'traverse_trees()' interfaceLibravatar Linus Torvalds1-281/+249
This not only deletes more code than it adds, it gets rid of a singularly hard-to-understand function (unpack_trees_rec()), and replaces it with a set of smaller and simpler functions that use the generic tree traversal mechanism to walk over one or more git trees in parallel. It's still not the most wonderful interface, and by no means is the new code easy to understand either, but it's at least a bit less opaque. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-27Merge branch 'db/checkout'Libravatar Junio C Hamano1-56/+98
* db/checkout: (21 commits) checkout: error out when index is unmerged even with -m checkout: show progress when checkout takes long time while switching branches Add merge-subtree back checkout: updates to tracking report builtin-checkout.c: Remove unused prefix arguments in switch_branches path checkout: work from a subdirectory checkout: tone down the "forked status" diagnostic messages Clean up reporting differences on branch switch builtin-checkout.c: fix possible usage segfault checkout: notice when the switched branch is behind or forked Build in checkout Move code to clean up after a branch change to branch.c Library function to check for unmerged index entries Use diff -u instead of diff in t7201 Move create_branch into a library file Build-in merge-recursive Add "skip_unmerged" option to unpack_trees. Discard "deleted" cache entries after using them to update the working tree Send unpack-trees debugging output to stderr Add flag to make unpack_trees() not print errors. ... Conflicts: Makefile
2008-02-24Be more verbose when checkout takes a long timeLibravatar Linus Torvalds1-1/+1
So I find it irritating when git thinks for a long time without telling me what's taking so long. And by "long time" I definitely mean less than two seconds, which is already way too long for me. This hits me when doing a large pull and the checkout takes a long time, or when just switching to another branch that is old and again checkout takes a while. Now, git read-tree already had support for the "-v" flag that does nice updates about what's going on, but it was delayed by two seconds, and if the thing had already done more than half by then it would be quiet even after that, so in practice it meant that we migth be quiet for up to four seconds. Much too long. So this patch changes the timeout to just one second, which makes it much more palatable to me. The other thing this patch does is that "git checkout" now doesn't disable the "-v" flag when doing its thing, and only disables the output when given the -q flag. When allowing "checkout -m" to fall back to a 3-way merge, the users will see the error message from straight "checkout", so we will tell them that we do fall back to make them look less scary. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-22Use helper function for copying index entry informationLibravatar Linus Torvalds1-1/+1
We used to just memcpy() the index entry when we copied the stat() and SHA1 hash information, which worked well enough back when the index entry was just an exact bit-for-bit representation of the information on disk. However, these days we actually have various management information in the cache entry too, and we should be careful to not overwrite it when we copy the stat information from another index entry. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-16Merge branch 'jc/gitignore-ends-with-slash'Libravatar Junio C Hamano1-1/+2
* jc/gitignore-ends-with-slash: gitignore: lazily find dtype gitignore(5): Allow "foo/" in ignore list to match directory "foo"
2008-02-09Add "skip_unmerged" option to unpack_trees.Libravatar Daniel Barkalow1-3/+17
This option allows the caller to reset everything that isn't unmerged, leaving the unmerged things to be resolved. If, after a merge of "working" and "HEAD", this is used with "HEAD" (reset, !update), the result will be that all of the changes from "local" are in the working tree but not added to the index (either with the index clean but unchanged, or with the index unmerged, depending on whether there are conflicts). This will be used in checkout -m. Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
2008-02-09Discard "deleted" cache entries after using them to update the working treeLibravatar Daniel Barkalow1-7/+9
Way back in read-tree.c, we used a mode 0 cache entry to indicate that an entry had been deleted, so that the update code would remove the working tree file, and we would just skip it when writing out the index file afterward. These days, unpack_trees is a library function, and it is still leaving these entries in the active cache. Furthermore, unpack_trees doesn't correctly ignore those entries, and who knows what other code wouldn't expect them to be there, but just isn't yet called after a call to unpack_trees. To avoid having other code trip over these entries, have check_updates() remove them after it removes the working tree files. While we're at it, simplify the loop in check_updates(), and avoid passing global variables as parameters to check_updates(): there is only one call site anyway. Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
2008-02-09Send unpack-trees debugging output to stderrLibravatar Daniel Barkalow1-7/+7
This is to keep git-stash from getting confused if you're debugging unpack-trees. Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
2008-02-09Add flag to make unpack_trees() not print errors.Libravatar Daniel Barkalow1-14/+29
(This applies only to errors where a plausible operation is impossible due to the particular data, not to errors resulting from misuse of the merge functions.) This will allow builtin-checkout to suppress merge errors if it's going to try more merging methods. Additionally, if unpack_trees() returns with an error, but without printing anything, it will roll back any changes to the index (by rereading the index, currently). This obviously could be done by the caller, but chances are that the caller would forget and debugging this is difficult. Also, future implementations may give unpack_trees() a more efficient way of undoing its changes than the caller could. Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
2008-02-09Allow callers of unpack_trees() to handle failureLibravatar Daniel Barkalow1-37/+48
Return an error from unpack_trees() instead of calling die(), and exit with an error in read-tree, builtin-commit, and diff-lib. merge-recursive already expected an error return from unpack_trees, so it doesn't need to be changed. The merge function can return negative to abort. This will be used in builtin-checkout -m. Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
2008-02-05gitignore: lazily find dtypeLibravatar Junio C Hamano1-1/+2
When we process "foo/" entries in gitignore files on a system that does not have d_type member in "struct dirent", the earlier implementation ran lstat(2) separately when matching with entries that came from the command line, in-tree .gitignore files, and $GIT_DIR/info/excludes file. This optimizes it by delaying the lstat(2) call until it becomes absolutely necessary. The initial idea for this change was by Jeff King, but I optimized it further to pass pointers to around. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-05gitignore(5): Allow "foo/" in ignore list to match directory "foo"Libravatar Junio C Hamano1-1/+1
A pattern "foo/" in the exclude list did not match directory "foo", but a pattern "foo" did. This attempts to extend the exclude mechanism so that it would while not matching a regular file or a symbolic link "foo". In order to differentiate a directory and non directory, this passes down the type of path being checked to excluded() function. A downside is that the recursive directory walk may need to run lstat(2) more often on systems whose "struct dirent" do not give the type of the entry; earlier it did not have to do so for an excluded path, but we now need to figure out if a path is a directory before deciding to exclude it. This is especially bad because an idea similar to the earlier CE_UPTODATE optimization to reduce number of lstat(2) calls would by definition not apply to the codepaths involved, as (1) directories will not be registered in the index, and (2) excluded paths will not be in the index anyway. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-01-21Make on-disk index representation separate from in-core oneLibravatar Linus Torvalds1-15/+14
This converts the index explicitly on read and write to its on-disk format, allowing the in-core format to contain more flags, and be simpler. In particular, the in-core format is now host-endian (as opposed to the on-disk one that is network endian in order to be able to be shared across machines) and as a result we can dispense with all the htonl/ntohl on accesses to the cache_entry fields. This will make it easier to make use of various temporary flags that do not exist in the on-disk format. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-12-18unpack-trees: FLEX_ARRAY fixLibravatar Linus Torvalds1-1/+1
In unpack-trees.c (line 593), we do .. if (same(old, merge)) { *merge = *old; } else { .. and that "merge" is a cache_entry pointer. If we have a non-zero FLEX_ARRAY size, it will cause us to copy the first few bytes of the name too. That is technically wrong even for FLEX_ARRAY being 1, but you'll never notice, since the filenames should always be the same with the current code. But if we do the same thing for a rename, we'd be screwed. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-29per-directory-exclude: lazily read .gitignore filesLibravatar Junio C Hamano1-6/+0
Operations that walk directories or trees, which potentially need to consult the .gitignore files, used to always try to open the .gitignore file every time they entered a new directory, even when they ended up not needing to call excluded() function to see if a path in the directory is ignored. This was done by push/pop exclude_per_directory() functions that managed the data in a stack. This changes the directory walking API to remove the need to call these two functions. Instead, the directory walk data structure caches the data used by excluded() function the last time, and lazily reuses it as much as possible. Among the data the last check used, the ones from deeper directories that the path we are checking is outside are discarded, data from the common leading directories are reused, and then the directories between the common directory and the directory the path being checked is in are checked for .gitignore file. This is very similar to the way gitattributes are handled. This API change also fixes "ls-files -c -i", which called excluded() without setting up the gitignore data via the old push/pop functions. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-14Merge branch 'jc/maint-add-sync-stat'Libravatar Junio C Hamano1-2/+2
* jc/maint-add-sync-stat: t2200: test more cases of "add -u" git-add: make the entry stat-clean after re-adding the same contents ce_match_stat, run_diff_files: use symbolic constants for readability Conflicts: builtin-add.c
2007-11-10ce_match_stat, run_diff_files: use symbolic constants for readabilityLibravatar Junio C Hamano1-2/+2
ce_match_stat() can be told: (1) to ignore CE_VALID bit (used under "assume unchanged" mode) and perform the stat comparison anyway; (2) not to perform the contents comparison for racily clean entries and report mismatch of cached stat information; using its "option" parameter. Give them symbolic constants. Similarly, run_diff_files() can be told not to report anything on removed paths. Also give it a symbolic constant for that. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-30relax usage of the progress APILibravatar Nicolas Pitre1-5/+3
Since it is now OK to pass a null pointer to display_progress() and stop_progress() resulting in a no-op, then we can simplify the code and remove a bunch of lines by not making those calls conditional all the time. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-30make struct progress an opaque typeLibravatar Nicolas Pitre1-5/+5
This allows for better management of progress "object" existence, as well as making the progress display implementation more independent from its callers. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-17more compact progress displayLibravatar Nicolas Pitre1-2/+2
Each progress can be on a single line instead of two. [sp: Changed "Checking files out" to "Checking out files" at Johannes Sixt's suggestion as it better explains the action that is taking place] Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-08-10Optimize the three-way merge of git-read-treeLibravatar Linus Torvalds1-2/+5
As mentioned, the three-way case *should* be as trivial as the following. It passes all the tests, and I verified that a conflicting merge in the 100,000 file horror-case merged correctly (with the conflict markers) in 0.687 seconds with this, so it works, but I'm lazy and somebody else should double-check it [jc: followed all three-way merge codepaths and verified it removes when it should]. Without this patch, the merge took 8.355 seconds, so this patch really does make a huge difference for merge performance with lots and lots of files, and we're not talking percentages, we're talking orders-of-magnitude differences! Now "unpack_trees()" is just fast enough that we don't need to avoid it (although it's probably still a good idea to eventually convert it to use the traverse_trees() infrastructure some day - just to avoid having extraneous tree traversal functions). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-10Optimize the two-way merge of git-read-tree tooLibravatar Linus Torvalds1-3/+4
This trivially optimizes the two-way merge case of git-read-tree too, which affects switching branches. When you have tons and tons of files in your repository, but there are only small differences in the branches (maybe just a couple of files changed), the biggest cost of the branch switching was actually just the index calculations. This fixes it (timings for switching between the "testing" and "master" branches in the 100,000 file testing-repo-from-hell, where the branches only differ in one small file). Before: [torvalds@woody bummer]$ time git checkout master real 0m9.919s user 0m8.461s sys 0m0.264s After: [torvalds@woody bummer]$ time git checkout testing real 0m0.576s user 0m0.348s sys 0m0.228s so it's easily an order of magnitude different. This concludes the series. I think we could/should do the three-way merge too (to speed up merges), but I'm lazy. Somebody else can do it. The rule is very simple: you need to remove the old entry if: - you want to remove the file entirely - you replace it with a "merge conflict" entry (ie a non-stage-0 entry) and you can avoid removing it if you either - keep the old one - or resolve it to a new one. and these rules should all be valid for the three-way case too. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-10Optimize the common cases of git-read-treeLibravatar Linus Torvalds1-3/+3
This optimizes bind_merge() and oneway_merge() to not unnecessarily remove and re-add the old index entries when they can just get replaced by updated ones. This makes these operations much faster for large trees (where "large" is in the 50,000+ file range), because we don't unnecessarily move index entries around in the index array all the time. Using the "bummer" tree (a test-tree with 100,000 files) we get: Before: [torvalds@woody bummer]$ time git commit -m"Change one file" 50/500 real 0m9.470s user 0m8.729s sys 0m0.476s After: [torvalds@woody bummer]$ time git commit -m"Change one file" 50/500 real 0m1.173s user 0m0.720s sys 0m0.452s so for large trees this is easily very noticeable indeed. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-10Move old index entry removal from "unpack_trees()" into the individual functionsLibravatar Linus Torvalds1-6/+23
This makes no changes to current code, but it allows the individual merge functions to decide what to do about the old entry. They might decide to update it in place, rather than force them to always delete and re-add it. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-10Start moving unpack-trees to "struct tree_desc"Libravatar Linus Torvalds1-16/+9
This doesn't actually change any real code, but it changes the interface to unpack_trees() to take an array of "struct tree_desc" entries, the same way the tree-walk.c functions do. The reason for this is that we would be much better off if we can do the tree-unpacking using the generic "traverse_trees()" functionality instead of having to the special "unpack" infrastructure. This really is a pretty minimal diff, just to change the calling convention. It passes all the tests, and looks sane. There were only two users of "unpack_trees()": builtin-read-tree and merge-recursive, and I tried to keep the changes minimal. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-05unpack-trees.c: assume submodules are clean during check-outLibravatar Junio C Hamano1-0/+9
Sven originally raised this issue: If you have a submodule checked out and you go back (or forward) to a revision of the supermodule that contains a different revision of the submodule and then switch to another revision, it will complain that the submodule is not uptodate, because git simply didn't update the submodule in the first move. The current policy is to consider it is perfectly normal that checked-out submodule is out-of-sync wrt the supermodule index. At least until we introduce a superproject repository configuration option that says "in this repository, I do care about this submodule and at any time I move around in the superproject, recursively check out the submodule to match", it is a reasonable policy, as we currently do not recursively checkout the submodules at all. The most extreme case of this policy is that the superproject index knows about the submodule but the subdirectory does not even have to be checked out. The function verify_uptodate(), called during the two-way merge aka branch switching, is about "make sure the filesystem entity that corresponds to this cache entry is up to date, lest we lose the local modifications". As we explicitly allow submodule checkout to drift from the supermodule index entry, the check should say "Ok, for submodules, not matching is the norm" for now. Later when we have the ability to mark "I care about this submodule to be always in sync with the superproject" (thereby implementing automatic recursive checkout and perhaps diff, among other things), we should check if the submodule in question is marked as such and perform the current test. Acked-by: Lars Hjemli <hjemli@gmail.com> Acked-by: Sven Verdoolaege <skimo@kotnet.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-07-24cleanup unpack-trees.c: shrink struct tree_entry_listLibravatar René Scharfe1-9/+3
Remove the two write-only fields executable and symlink from struct tree_entry_list. Also replace usage of the field directory with S_ISDIR checks on the mode field, and then remove this now obsolete field, too. Noticed by David Kastrup. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-07-18unpack-trees.c: assume submodules are clean during check-outLibravatar Sven Verdoolaege1-25/+50
In particular, when moving back to a commit without a given submodule and then moving back forward to a commit with the given submodule, we shouldn't complain that updating would lose untracked file in the submodule, because git currently does not checkout subprojects during superproject check-out. Signed-off-by: Sven Verdoolaege <skimo@kotnet.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-07-12Teach read-tree 2-way merge to ignore intermediate symlinksLibravatar Junio C Hamano1-0/+3
Earlier in 16a4c61, we taught "read-tree -m -u" not to be confused when switching from a branch that has a path frotz/filfre to another branch that has a symlink frotz that points at xyzzy/ directory. The fix was incomplete in that it was still confused when coming back (i.e. switching from a branch with frotz -> xyzzy/ to another branch with frotz/filfre). This fix is rather expensive in that for a path that is created we would need to see if any of the leading component of that path exists as a symbolic link in the filesystem (in which case, we know that path itself does not exist, and the fact we already decided to check it out tells us that in the index we already know that symbolic link is going away as there is no D/F conflict). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-05-20Merge branch 'maint-1.5.1' into maintLibravatar Junio C Hamano1-4/+0
* maint-1.5.1: annotate: make it work from subdirectories. git-config: Correct asciidoc documentation for --int/--bool t1300: Add tests for git-config --bool --get unpack-trees.c: verify_uptodate: remove dead code Use PATH_MAX instead of TEMPFILE_PATH_LEN branch: fix segfault when resolving an invalid HEAD
2007-05-20unpack-trees.c: verify_uptodate: remove dead codeLibravatar Sven Verdoolaege1-4/+0
This code was killed by commit fcc387db9bc453dc7e07a262873481af2ee9e5c8. Signed-off-by: Sven Verdoolaege <skimo@kotnet.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-05-11read-tree -m -u: avoid getting confused by intermediate symlinks.Libravatar Junio C Hamano1-4/+10
When switching from a branch with both x86_64/boot/Makefile and i386/boot/Makefile to another branch that has x86_64/boot as a symlink pointing at ../i386/boot, the code incorrectly removed i386/boot/Makefile. This was because we first removed everything under x86_64/boot to make room to create a symbolic link x86_64/boot, then removed x86_64/boot/Makefile which no longer exists but now is pointing at i386/boot/Makefile, thanks to the symlink we just created. This fixes it by using the has_symlink_leading_path() function introduced previously for git-apply in the checkout codepath. Earlier, "git checkout" was broken in t4122 test due to this bug, and the test had an extra "git reset --hard" as a workaround, which is removed because it is not needed anymore. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-04-22delay progress display when checking out filesLibravatar Nicolas Pitre1-7/+2
Let's start displaying progress only if more than 50% of total number of files remains to be checked out after 2 seconds. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-04-22make progress "title" part of the common progress interfaceLibravatar Nicolas Pitre1-4/+3
If the progress bar ends up in a box, better provide a title for it too. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>