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2013-12-10shallow.c: the 8 steps to select new commits for .git/shallowLibravatar Nguyễn Thái Ngọc Duy1-1/+1
Suppose a fetch or push is requested between two shallow repositories (with no history deepening or shortening). A pack that contains necessary objects is transferred over together with .git/shallow of the sender. The receiver has to determine whether it needs to update .git/shallow if new refs needs new shallow comits. The rule here is avoid updating .git/shallow by default. But we don't want to waste the received pack. If the pack contains two refs, one needs new shallow commits installed in .git/shallow and one does not, we keep the latter and reject/warn about the former. Even if .git/shallow update is allowed, we only add shallow commits strictly necessary for the former ref (remember the sender can send more shallow commits than necessary) and pay attention not to accidentally cut the receiver history short (no history shortening is asked for) So the steps to figure out what ref need what new shallow commits are: 1. Split the sender shallow commit list into "ours" and "theirs" list by has_sha1_file. Those that exist in current repo in "ours", the remaining in "theirs". 2. Check the receiver .git/shallow, remove from "ours" the ones that also exist in .git/shallow. 3. Fetch the new pack. Either install or unpack it. 4. Do has_sha1_file on "theirs" list again. Drop the ones that fail has_sha1_file. Obviously the new pack does not need them. 5. If the pack is kept, remove from "ours" the ones that do not exist in the new pack. 6. Walk the new refs to answer the question "what shallow commits, both ours and theirs, are required in .git/shallow in order to add this ref?". Shallow commits not associated to any refs are removed from their respective list. 7. (*) Check reachability (from the current refs) of all remaining commits in "ours". Those reachable are removed. We do not want to cut any part of our (reachable) history. We only check up commits. True reachability test is done by check_everything_connected() at the end as usual. 8. Combine the final "ours" and "theirs" and add them all to .git/shallow. Install new refs. The case where some hook rejects some refs on a push is explained in more detail in the push patches. Of these steps, #6 and #7 are expensive. Both require walking through some commits, or in the worst case all commits. And we rather avoid them in at least common case, where the transferred pack does not contain any shallow commits that the sender advertises. Let's look at each scenario: 1) the sender has longer history than the receiver All shallow commits from the sender will be put into "theirs" list at step 1 because none of them exists in current repo. In the common case, "theirs" becomes empty at step 4 and exit early. 2) the sender has shorter history than the receiver All shallow commits from the sender are likely in "ours" list at step 1. In the common case, if the new pack is kept, we could empty "ours" and exit early at step 5. If the pack is not kept, we hit the expensive step 6 then exit after "ours" is emptied. There'll be only a handful of objects to walk in fast-forward case. If it's forced update, we may need to walk to the bottom. 3) the sender has same .git/shallow as the receiver This is similar to case 2 except that "ours" should be emptied at step 2 and exit early. A fetch after "clone --depth=X" is case 1. A fetch after "clone" (from a shallow repo) is case 3. Luckily they're cheap for the common case. A push from "clone --depth=X" falls into case 2, which is expensive. Some more work may be done at the sender/client side to avoid more work on the server side: if the transferred pack does not contain any shallow commits, send-pack should not send any shallow commits to the receive-pack, effectively turning it into a normal push and avoid all steps. This patch implements all steps except #3, already handled by fetch-pack and receive-pack, #6 and #7, which has their own patch due to their size. (*) in previous versions step 7 was put before step 3. I reorder it so that the common case that keeps the pack does not need to walk commits at all. In future if we implement faster commit reachability check (maybe with the help of pack bitmaps or commit cache), step 7 could become cheap and be moved up before 6 again. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-09add missing "format" function attributesLibravatar Jeff King1-0/+1
For most of our functions that take printf-like formats, we use gcc's __attribute__((format)) to get compiler warnings when the functions are misused. Let's give a few more functions the same protection. In most cases, the annotations do not uncover any actual bugs; the only code change needed is that we passed a size_t to transfer_debug, which expected an int. Since we expect the passed-in value to be a relatively small buffer size (and cast a similar value to int directly below), we can just cast away the problem. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-09-15trace.c: mark a private file-scope symbol as staticLibravatar Junio C Hamano1-1/+1
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-22Fix sparse warningsLibravatar Stephen Boyd1-1/+1
Fix warnings from 'make check'. - These files don't include 'builtin.h' causing sparse to complain that cmd_* isn't declared: builtin/clone.c:364, builtin/fetch-pack.c:797, builtin/fmt-merge-msg.c:34, builtin/hash-object.c:78, builtin/merge-index.c:69, builtin/merge-recursive.c:22 builtin/merge-tree.c:341, builtin/mktag.c:156, builtin/notes.c:426 builtin/notes.c:822, builtin/pack-redundant.c:596, builtin/pack-refs.c:10, builtin/patch-id.c:60, builtin/patch-id.c:149, builtin/remote.c:1512, builtin/remote-ext.c:240, builtin/remote-fd.c:53, builtin/reset.c:236, builtin/send-pack.c:384, builtin/unpack-file.c:25, builtin/var.c:75 - These files have symbols which should be marked static since they're only file scope: submodule.c:12, diff.c:631, replace_object.c:92, submodule.c:13, submodule.c:14, trace.c:78, transport.c:195, transport-helper.c:79, unpack-trees.c:19, url.c:3, url.c:18, url.c:104, url.c:117, url.c:123, url.c:129, url.c:136, thread-utils.c:21, thread-utils.c:48 - These files redeclare symbols to be different types: builtin/index-pack.c:210, parse-options.c:564, parse-options.c:571, usage.c:49, usage.c:58, usage.c:63, usage.c:72 - These files use a literal integer 0 when they really should use a NULL pointer: daemon.c:663, fast-import.c:2942, imap-send.c:1072, notes-merge.c:362 While we're in the area, clean up some unused #includes in builtin files (mostly exec_cmd.h). Signed-off-by: Stephen Boyd <bebarino@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-08trace: give repo_setup trace its own keyLibravatar Jeff King1-5/+6
You no longer get this output with GIT_TRACE=1; instead, you can do GIT_TRACE_SETUP=1. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-08trace: add trace_strbufLibravatar Jeff King1-7/+16
If you happen to have a strbuf, it is a little more readable and a little more efficient to be able to print it directly instead of jamming it through the trace_printf interface. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-08trace: factor out "do we want to trace" logicLibravatar Jeff King1-3/+11
As we add more tracing areas, this will avoid repeated code. Technically, trace_printf already checks this and will avoid printing if the trace key is not set. However, callers may want to find out early whether or not tracing is enabled so they can avoid doing work in the common non-trace case. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-08trace: refactor to support multiple env variablesLibravatar Jeff King1-10/+18
Right now you turn all tracing off and on with GIT_TRACE. To support new types of tracing without forcing the user to see all of them, we will soon support turning each tracing area on with GIT_TRACE_*. This patch lays the groundwork by providing an interface which does not assume GIT_TRACE. However, we still maintain the trace_printf interface so that existing callers do not need to be refactored. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-08trace: add trace_vprintfLibravatar Jeff King1-5/+9
This is a necessary cleanup to adding new types of trace functions. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-02-26strbuf: add strbuf_vaddfLibravatar Jeff King1-26/+6
In a variable-args function, the code for writing into a strbuf is non-trivial. We ended up cutting and pasting it in several places because there was no vprintf-style function for strbufs (which in turn was held up by a lack of va_copy). Now that we have a fallback va_copy, we can add strbuf_vaddf, the strbuf equivalent of vsprintf. And we can clean up the cut and paste mess. Signed-off-by: Jeff King <peff@peff.net> Improved-by: Christian Couder <christian.couder@gmail.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-01-06trace.c: ensure NULL is not passed to printfLibravatar Brandon Casey1-1/+8
GNU printf, and many others, will print the string "(null)" if a NULL pointer is passed as the argument to a "%s" format specifier. Some implementations (like on Solaris) do not detect a NULL pointer and will produce a segfault in this case. So, fix this by ensuring that pointer variables do not contain the value NULL. Assign the string "(null)" to the variables are NULL. Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-12-28Merge branch 'nd/setup'Libravatar Junio C Hamano1-0/+42
* nd/setup: (47 commits) setup_work_tree: adjust relative $GIT_WORK_TREE after moving cwd git.txt: correct where --work-tree path is relative to Revert "Documentation: always respect core.worktree if set" t0001: test git init when run via an alias Remove all logic from get_git_work_tree() setup: rework setup_explicit_git_dir() setup: clean up setup_discovered_git_dir() t1020-subdirectory: test alias expansion in a subdirectory setup: clean up setup_bare_git_dir() setup: limit get_git_work_tree()'s to explicit setup case only Use git_config_early() instead of git_config() during repo setup Add git_config_early() git-rev-parse.txt: clarify --git-dir t1510: setup case #31 t1510: setup case #30 t1510: setup case #29 t1510: setup case #28 t1510: setup case #27 t1510: setup case #26 t1510: setup case #25 ...
2010-12-21set_try_to_free_routine(NULL) means "do nothing special"Libravatar Junio C Hamano1-6/+2
This way, the next caller that wants to disable our memory reclamation machinery does not have to define its own do_nothing() stub. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-12-17trace.c: mark file-local function staticLibravatar Vasyl' Vavrychuk1-1/+1
Signed-off-by: Vasyl' Vavrychuk <vvavrychuk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-29builtins: print setup info if repo is foundLibravatar Nguyễn Thái Ngọc Duy1-0/+42
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-05-08Do not call release_pack_memory in malloc wrappers when GIT_TRACE is usedLibravatar Johannes Sixt1-0/+6
This avoids a potential race condition when async procedures are implemented as threads where release_pack_memory() can be called from different threads without locking under memory pressure. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-02-25trace: Fixed a minor typo in an error message.Libravatar Allan Caffee1-1/+1
Signed-off-by: Allan Caffee <allan.caffee@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-12-03Trace and quote with argv: get rid of unneeded count argument.Libravatar Christian Couder1-2/+2
Now that str_buf takes care of all the allocations, there is no more gain to pass an argument count. So this patch removes the "count" argument from: - "sq_quote_argv" - "trace_argv_printf" and all the callers. Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-26Use is_absolute_path() in diff-lib.c, lockfile.c, setup.c, trace.cLibravatar Steffen Prohaska1-1/+1
Using the helper function to test for absolute paths makes porting easier. Signed-off-by: Steffen Prohaska <prohaska@zib.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-14Handle broken vsnprintf implementations in strbufLibravatar Shawn O. Pearce1-2/+2
Solaris 9's vsnprintf implementation returns -1 if we pass it a buffer of length 0. The only way to get it to give us the actual length necessary for the formatted string is to grow the buffer out to have at least 1 byte available in the strbuf and then ask it to compute the length. If the available space is 0 I'm growing it out by 64 to ensure we will get an accurate length estimate from all implementations. Some callers may need to grow the strbuf again but 64 should be a reasonable enough initial growth. We also no longer silently fail to append to the string when we are faced with a broken vsnprintf implementation. On Solaris 9 this silent failure caused me to no longer be able to execute "git clone" as we tried to exec the empty string rather than "git-clone". Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-09-21sq_quote_argv and add_to_string rework with strbuf's.Libravatar Pierre Habouzit1-20/+31
* sq_quote_buf is made public, and works on a strbuf. * sq_quote_argv also works on a strbuf. * make sq_quote_argv take a "maxlen" argument to check the buffer won't grow too big. Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-09-20nfv?asprintf are broken without va_copy, workaround them.Libravatar Pierre Habouzit1-63/+27
* drop nfasprintf. * move nfvasprintf into imap-send.c back, and let it work on a 8k buffer, and die() in case of overflow. It should be enough for imap commands, if someone cares about imap-send, he's welcomed to fix it properly. * replace nfvasprintf use in merge-recursive with a copy of the strbuf_addf logic, it's one place, we'll live with it. To ease the change, output_buffer string list is replaced with a strbuf ;) * rework trace.c to call vsnprintf itself. It's used to format strerror()s and git command names, it should never be more than a few octets long, let it work on a 8k static buffer with vsnprintf or die loudly. Signed-off-by: Pierre Habouzit <madcoder@debian.org>
2007-03-10git-branch, git-checkout: autosetup for remote branch trackingLibravatar Paolo Bonzini1-8/+10
In order to track and build on top of a branch 'topic' you track from your upstream repository, you often would end up doing this sequence: git checkout -b mytopic origin/topic git config --add branch.mytopic.remote origin git config --add branch.mytopic.merge refs/heads/topic This would first fork your own 'mytopic' branch from the 'topic' branch you track from the 'origin' repository; then it would set up two configuration variables so that 'git pull' without parameters does the right thing while you are on your own 'mytopic' branch. This commit adds a --track option to git-branch, so that "git branch --track mytopic origin/topic" performs the latter two actions when creating your 'mytopic' branch. If the configuration variable branch.autosetupmerge is set to true, you do not have to pass the --track option explicitly; further patches in this series allow setting the variable with a "git remote add" option. The configuration variable is off by default, and there is a --no-track option to countermand it even if the variable is set. Signed-off-by: Paolo Bonzini <bonzini@gnu.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-08short i/o: clean up the naming for the write_{in,or}_xxx familyLibravatar Andy Whitcroft1-2/+2
We recently introduced a write_in_full() which would either write the specified object or emit an error message and fail. In order to fix the read side we now want to introduce a read_in_full() but without an error emit. This patch cleans up the naming of this family of calls: 1) convert the existing write_or_whine() to write_or_whine_pipe() to better indicate its pipe specific nature, 2) convert the existing write_in_full() calls to write_or_whine() to better indicate its nature, 3) introduce a write_in_full() providing a write or fail semantic, and 4) convert write_or_whine() and write_or_whine_pipe() to use write_in_full(). Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-10-14Fix tracing when GIT_TRACE is set to an empty string.Libravatar Christian Couder1-1/+2
Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-12Fix space in string " false" problem in "trace.c".Libravatar Christian Couder1-1/+1
Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-02Trace into a file or an open fd and refactor tracing code.Libravatar Christian Couder1-0/+149
If GIT_TRACE is set to an absolute path (starting with a '/' character), we interpret this as a file path and we trace into it. Also if GIT_TRACE is set to an integer value greater than 1 and lower than 10, we interpret this as an open fd value and we trace into it. Note that this behavior is not compatible with the previous one. We also trace whole messages using one write(2) call to make sure messages from processes do net get mixed up in the middle. This patch makes it possible to get trace information when running "make test". Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <junkio@cox.net>