I audited git for potential undetected write failures.
In the cases fixed below, the diagnostics I add mimic the diagnostics
used in surrounding code, even when that means not reporting
the precise strerror(errno) cause of the error.
Signed-off-by: Jim Meyering <jim@meyering.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This means that send-pack and http-push will support pattern refspecs,
so builtin-push.c doesn't have to expand them, and also git push can
just turn --tags into "refs/tags/*", further simplifying
builtin-push.c
check_ref_format() gets a third "conditionally okay" result for
something that's valid as a pattern but not as a particular ref.
Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
git-checkout is also adapted to make use of this new option
instead of the handcrafted command sequence.
Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
* lt/gitlink:
Tests for core subproject support
Expose subprojects as special files to "git diff" machinery
Fix some "git ls-files -o" fallout from gitlinks
Teach "git-read-tree -u" to check out submodules as a directory
Teach git list-objects logic to not follow gitlinks
Fix gitlink index entry filesystem matching
Teach "git-read-tree -u" to check out submodules as a directory
Teach git list-objects logic not to follow gitlinks
Don't show gitlink directories when we want "other" files
Teach git-update-index about gitlinks
Teach directory traversal about subprojects
Fix thinko in subproject entry sorting
Teach core object handling functions about gitlinks
Teach "fsck" not to follow subproject links
Add "S_IFDIRLNK" file mode infrastructure for git links
Add 'resolve_gitlink_ref()' helper function
Avoid overflowing name buffer in deep directory structures
diff-lib: use ce_mode_from_stat() rather than messing with modes manually
Rather than sorting the refs list while building it, sort in one
go after it is built using a merge sort. This has a large
performance boost with large numbers of refs.
It shouldn't happen that we read duplicate entries into the same
list, but just in case sort_ref_list drops them if the SHA1s are
the same, or dies, as we have no way of knowing which one is the
correct one.
Signed-off-by: Julian Phillips <julian@quantumfyre.co.uk>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
delete_ref function does not change the 'sha1' parameter. Non-const pointer
causes a compiler warning if you call to the function using a const argument.
Signed-off-by: Carlos Rica <jasampler@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This new function resolves a ref in *another* git repository. It's
named for its intended use: to look up the git link to a subproject.
It's not actually wired up to anything yet, but we're getting closer to
having fundamental plumbing support for "links" from one git directory
to another, which is the basis of subproject support.
[jc: amended a FILE* leak]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This moves the knowledge about .git/config usage out of refs.c and into
builtin-branch.c instead, which allows git-branch to update HEAD to point
at the moved branch before attempting to update the config file. It also
allows git-branch to exit with an error code if updating the config file
should fail.
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
If git_config_rename_section() fails, rename_ref() used to return 1, which
left HEAD pointing to an absent refs/heads file (since the actual renaming
had already occurred).
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
The HEAD reflog is updated as well as the reflog for the branch pointed
to by HEAD whenever it is referenced with "HEAD".
There are some cases where a specific branch may be modified directly.
In those cases, the HEAD reflog should be updated as well if it is a
symref to that branch in order to be consistent.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
* maint:
git.el: Retrieve commit log information from .dotest directory.
git.el: Avoid appending a signoff line that is already present.
setup_git_directory_gently: fix off-by-one error
user-manual: install user manual stylesheet with other web documents
user-manual: fix rendering of history diagrams
user-manual: fix missing colon in git-show example
user-manual: fix inconsistent use of pull and merge
user-manual: fix inconsistent example
glossary: fix overoptimistic automatic linking of defined terms
Documentation: s/seperator/separator/
Adjust reflog filemode in shared repository
Without this, committing in a group-shared repository would not work
even though all developers are in the same group.
Signed-off-by: Matthias Kestenholz <matthias@spinlock.ch>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Some systems have sizeof(off_t) == 8 while sizeof(size_t) == 4.
This implies that we are able to access and work on files whose
maximum length is around 2^63-1 bytes, but we can only malloc or
mmap somewhat less than 2^32-1 bytes of memory.
On such a system an implicit conversion of off_t to size_t can cause
the size_t to wrap, resulting in unexpected and exciting behavior.
Right now we are working around all gcc warnings generated by the
-Wshorten-64-to-32 option by passing the off_t through xsize_t().
In the future we should make xsize_t on such problematic platforms
detect the wrapping and die if such a file is accessed.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
* maint:
Unset NO_C99_FORMAT on Cygwin.
Fix a "pointer type missmatch" warning.
Fix some "comparison is always true/false" warnings.
Fix an "implicit function definition" warning.
Fix a "label defined but unreferenced" warning.
Document the config variable format.suffix
git-merge: fail correctly when we cannot fast forward.
builtin-archive: use RUN_SETUP
Fix git-gc usage note
This mechanically converts strncmp() to use prefixcmp(), but only when
the parameters match specific patterns, so that they can be verified
easily. Leftover from this will be fixed in a separate step, including
idiotic conversions like
if (!strncmp("foo", arg, 3))
=>
if (!(-prefixcmp(arg, "foo")))
This was done by using this script in px.perl
#!/usr/bin/perl -i.bak -p
if (/strncmp\(([^,]+), "([^\\"]*)", (\d+)\)/ && (length($2) == $3)) {
s|strncmp\(([^,]+), "([^\\"]*)", (\d+)\)|prefixcmp($1, "$2")|;
}
if (/strncmp\("([^\\"]*)", ([^,]+), (\d+)\)/ && (length($1) == $3)) {
s|strncmp\("([^\\"]*)", ([^,]+), (\d+)\)|(-prefixcmp($2, "$1"))|;
}
and running:
$ git grep -l strncmp -- '*.c' | xargs perl px.perl
Signed-off-by: Junio C Hamano <junkio@cox.net>
Some reflogs are/were generated without a message; do not plainly
ignore those entries.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>
When we remove the last reflog in a directory, opendir() would
succeed and we would iterate over its dirents, expecting retval
to be initialized to zero and setting it to non-zero only upon
seeing an error. If the directory is empty, oops!, we do not
have anybody that touches retval.
The problem is because we initialize retval to errno even on
success from opendir(), which would leave the errno unmolested.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This is to resolve conflicts early in preparation for possible
inclusion of "reflog on detached HEAD" series by Nico, as having
it in 1.5.0 would really help us remove confusion between
detached and attached states.
Signed-off-by: Junio C Hamano <junkio@cox.net>
Currently, the search for all reflogs depends on the existence of
corresponding refs under the .git/refs/ directory. Let's scan the
.git/logs/ directory directly instead.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
We used to use lock_any_ref_for_update() because the command
needs to also update HEAD (which is not under refs/, so
lock_ref_sha1() cannot be used). The function however did not
check for refs with illegal characters in them.
Use check_ref_format() to catch malformed refs. For this check,
we specifically do not want to say having less than two levels
in the name is illegal to allow HEAD (and perhaps other special
refs in the future).
Signed-off-by: Junio C Hamano <junkio@cox.net>
Being lazy to rely on the cycling N buffers mkpath() and friends
return is nice in general, but it makes it too easy to introduce
new bugs that are "mysterious".
Introduction of read_ref() in create_symref() after calling
git_path() to get the git_HEAD value (i.e. the path to create a
new symref at) consumed more than the available buffers and
broke a later call to mkpath() that derives lockpath from it.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This doesn't change the code at all. It is done to make the next patch
more obvious.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
If HEAD is tied to a branch then both logs/HEAD and logs/heads/<branch> are
updated. This is also true for any symbolic refs in general, but only HEAD
will see its reflog created automatically.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
A ref might be pointing to another ref but only the name of the last ref
is remembered. Let's remember about the first name as well.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This allows for ref_log_write() to be used in a more flexible way,
and is needed for future changes.
This is only code reorg with no behavior change.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
The file format dictates that entries are LF terminated so
the message cannot have one in it. Chomp the message to make
sure it only has a single line if necessary, while removing the
leading whitespace.
Signed-off-by: Junio C Hamano <junkio@cox.net>
The code that uses committer_info() in reflog can barf and die
whenever it is asked to update a ref. And I do not think
calling ignore_missing_committer_name() upfront like recent
receive-pack did in the aplication is a reasonable workaround.
What the patch does.
- git_committer_info() takes one parameter. It used to be "if
this is true, then die() if the name is not available due to
bad GECOS, otherwise issue a warning once but leave the name
empty". The reason was because we wanted to prevent bad
commits from being made by git-commit-tree (and its
callers). The value 0 is only used by "git var -l".
Now it takes -1, 0 or 1. When set to -1, it does not
complain but uses the pw->pw_name when name is not
available. Existing 0 and 1 values mean the same thing as
they used to mean before. 0 means issue warnings and leave
it empty, 1 means barf and die.
- ignore_missing_committer_name() and its existing caller
(receive-pack, to set the reflog) have been removed.
- git-format-patch, to come up with the phoney message ID when
asked to thread, now passes -1 to git_committer_info(). This
codepath uses only the e-mail part, ignoring the name. It
used to barf and die. The other call in the same program
when asked to add signed-off-by line based on committer
identity still passes 1 to make sure it barfs instead of
adding a bogus s-o-b line.
- log_ref_write in refs.c, to come up with the name to record
who initiated the ref update in the reflog, passes -1. It
used to barf and die.
The last change means that git-update-ref, git-branch, and
commit walker backends can now be used in a repository with
reflog by somebody who does not have the user identity required
to make a commit. They all used to barf and die.
I've run tests and all of them seem to pass, and also tried "git
clone" as a user whose GECOS is empty -- git clone works again
now (it was broken when reflog was enabled by default).
But this definitely needs extra sets of eyeballs.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This changes the output so the list at the top shows the reflog
message, along with their relative timestamps.
You can use --reflog=<n> to show <n> most recent log entries, or
use --reflog=<n>,<b> to show <n> entries going back from the
entry <b>. <b> can be either a number (so --reflog=4,20 shows 4
records starting from @{20}) or a timestamp (e.g. --reflog='4,1 day').
Here is a sample output (with --list option):
$ git show-branch --reflog=10 --list jc/show-reflog
[jc/show-reflog@{0}] (3 minutes ago) commit (amend): show-branch --ref
[jc/show-reflog@{1}] (5 minutes ago) reset HEAD^
[jc/show-reflog@{2}] (14 minutes ago) commit: show-branch --reflog: sho
[jc/show-reflog@{3}] (14 minutes ago) commit: show-branch --reflog: sho
[jc/show-reflog@{4}] (18 minutes ago) commit (amend): Extend read_ref_a
[jc/show-reflog@{5}] (18 minutes ago) commit (amend): Extend read_ref_a
[jc/show-reflog@{6}] (18 minutes ago) commit (amend): Extend read_ref_a
[jc/show-reflog@{7}] (18 minutes ago) am: read_ref_at(): allow retrievi
[jc/show-reflog@{8}] (18 minutes ago) reset --hard HEAD~4
[jc/show-reflog@{9}] (61 minutes ago) commit: show-branch --reflog: use
This shows what I did more cleanly:
$ git show-branch --reflog=10 jc/show-reflog
! [jc/show-reflog@{0}] (3 minutes ago) commit (amend): show-branch --ref
! [jc/show-reflog@{1}] (5 minutes ago) reset HEAD^
! [jc/show-reflog@{2}] (14 minutes ago) commit: show-branch --reflog:
! [jc/show-reflog@{3}] (14 minutes ago) commit: show-branch --reflog:
! [jc/show-reflog@{4}] (18 minutes ago) commit (amend): Extend read_
! [jc/show-reflog@{5}] (18 minutes ago) commit (amend): Extend read
! [jc/show-reflog@{6}] (18 minutes ago) commit (amend): Extend rea
! [jc/show-reflog@{7}] (18 minutes ago) am: read_ref_at(): allow
! [jc/show-reflog@{8}] (18 minutes ago) reset --hard HEAD~4
! [jc/show-reflog@{9}] (61 minutes ago) commit: show-branch --r
----------
+ [jc/show-reflog@{0}] show-branch --reflog: show the reflog
+ [jc/show-reflog@{2}] show-branch --reflog: show the reflog
+++ [jc/show-reflog@{1}] show-branch --reflog: show the reflog
+++++ [jc/show-reflog@{4}] Extend read_ref_at() to be usable fro
+ [jc/show-reflog@{5}] Extend read_ref_at() to be usable fro
+ [jc/show-reflog@{6}] Extend read_ref_at() to be usable fro
+ [jc/show-reflog@{7}] read_ref_at(): allow retrieving the r
+ [jc/show-reflog@{9}] show-branch --reflog: use updated rea
+ [jc/show-reflog@{9}^] read_ref_at(): allow reporting the c
+ [jc/show-reflog@{9}~2] show-branch --reflog: show the refl
+ [jc/show-reflog@{9}~3] read_ref_at(): allow retrieving the
++++++++++ [jc/show-reflog@{8}] dwim_ref(): Separate name-to-ref DWIM
At @{9}, I had a commit to complete 5 patch series, but I wanted
to consolidate two commits that enhances read_ref_at() into one
(they were @{9}^ and @{9}~3), and another two that touch show-branch
into one (@{9} and @{9}~2).
I first saved them with "format-patch -4", and then did a reset
at @{8}. At @{7}, I applied one of them with "am", and then
used "git-apply" on the other one, and amended the commit at
@{6} (so @{6} and @{7} has the same parent). I did not like the
log message, so I amended again at @{5}.
Then I cherry-picked @{9}~2 to create @{3} (the log message
shows that it needs to learn to set GIT_REFLOG_ACTION -- it uses
"git-commit" and the log entry is attributed for it). Another
cherry-pick built @{2} out of @{9}, but what I wanted to do was
to squash these two into one, so I did a "reset HEAD^" at @{1}
and then made the final commit by amending what was at the top.
Signed-off-by: Junio C Hamano <junkio@cox.net>
You can pass an extra argument to the function to receive the
reflog message information. Also when the log does not go back
beyond the point the user asked, the cut-off time and count are
given back to the caller for emitting the error messages as
appropriately.
We could later add configuration for get_sha1_basic() to make it
an error instead of it being just a warning.
Signed-off-by: Junio C Hamano <junkio@cox.net>
The code uses mmap() to read reflog data, but moves the pointer around
while reading, and uses that updated pointer in the call to munmap().
Signed-off-by: Junio C Hamano <junkio@cox.net>
The callback function can signal an early return by returning non-zero,
but the function leaked the FILE * opened on the reflog when doing so.
Signed-off-by: Junio C Hamano <junkio@cox.net>
The reflog code clears empty directories when rename returns
either EISDIR or ENOTDIR. Seems to be the only place.
Signed-off-by: Jason Riedy <ejr@cs.berkeley.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>
* jc/bare:
Disallow working directory commands in a bare repository.
git-fetch: allow updating the current branch in a bare repository.
Introduce is_bare_repository() and core.bare configuration variable
Move initialization of log_all_ref_updates
It used to ignore the return value of the helper function; now, it
expects it to return 0, and stops iteration upon non-zero return
values; this value is then passed on as the return value of
for_each_reflog_ent().
Further, it makes no sense to force the parsing upon the helper
functions; for_each_reflog_ent() now calls the helper function with
old and new sha1, the email, the timestamp & timezone, and the message.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>
We have a number of badly checked write() calls. Often we are
expecting write() to write exactly the size we requested or fail,
this fails to handle interrupts or short writes. Switch to using
the new write_in_full(). Otherwise we at a minimum need to check
for EINTR and EAGAIN, where this is appropriate use xwrite().
Note, the changes to config handling are much larger and handled
in the next patch in the sequence.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
We have a number of badly checked read() calls. Often we are
expecting read() to read exactly the size we requested or fail, this
fails to handle interrupts or short reads. Add a read_in_full()
providing those semantics. Otherwise we at a minimum need to check
for EINTR and EAGAIN, where this is appropriate use xread().
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This removes the old is_bare_git_dir(const char *) to ask if a
directory, if it is a GIT_DIR, is a bare repository, and
replaces it with is_bare_repository(void *). The function looks
at core.bare configuration variable if exists but uses the old
heuristics: if it is ".git" or ends with "/.git", then it does
not look like a bare repository, otherwise it does.
Signed-off-by: Junio C Hamano <junkio@cox.net>
The patches to prevent Porcelainish that require working tree
from doing any damage in a bare repository make a lot of sense,
and I want to make the is_bare_git_dir() function more reliable.
In order to allow the repository owner override the heuristic
implemented in is_bare_git_dir() if/when it misidentifies a
particular repository, it would make sense to introduce a new
configuration variable "[core] bare = true/false", and make
is_bare_git_dir() notice it.
The scripts would do a 'repo-config --bool --get core.bare' and
iff the command fails (i.e. there is no such variable in the
configuration file), it would use the heuristic implemented at
the script level [*1*].
However, setup_git_env() which is called a lot earlier than we
even read from the repository configuration currently makes a
call to is_bare_git_dir(), in order to change the default
setting for log_all_ref_updates. It somehow feels that this is
a hack.
By the way, [*1*] is another thing I hate about the current
config mechanism. "git-repo-config --get" does not know what
the possible configuration variables are, let alone what the
default values for them are. It allows us not to maintain a
centralized configuration table, which makes it easy to
introduce ad-hoc variables and gives a warm fuzzy feeling of
being modular, but my feeling is that it is turning out to be a
rather high price to pay for scripts.
Signed-off-by: Junio C Hamano <junkio@cox.net>
* sp/mmap: (27 commits)
Spell default packedgitlimit slightly differently
Increase packedGit{Limit,WindowSize} on 64 bit systems.
Update packedGit config option documentation.
mmap: set FD_CLOEXEC for file descriptors we keep open for mmap()
pack-objects: fix use of use_pack().
Fix random segfaults in pack-objects.
Cleanup read_cache_from error handling.
Replace mmap with xmmap, better handling MAP_FAILED.
Release pack windows before reporting out of memory.
Default core.packdGitWindowSize to 1 MiB if NO_MMAP.
Test suite for sliding window mmap implementation.
Create pack_report() as a debugging aid.
Support unmapping windows on 'temporary' packfiles.
Improve error message when packfile mmap fails.
Ensure core.packedGitWindowSize cannot be less than 2 pages.
Load core configuration in git-verify-pack.
Fully activate the sliding window pack access.
Unmap individual windows rather than entire files.
Document why header parsing won't exceed a window.
Loop over pack_windows when inflating/accessing data.
...
Conflicts:
cache.h
pack-check.c
It was stupid to link the same element twice to lock_file_list
and end up in a loop, so we certainly need a fix.
But it is not like we are taking a lock on multiple files in
this case. It is just that we leave the linked element on the
list even after commit_lock_file() successfully removes the
cruft.
We cannot remove the list element in commit_lock_file(); if we
are interrupted in the middle of list manipulation, the call to
remove_lock_file_on_signal() will happen with a broken list
structure pointed by lock_file_list, which would cause the cruft
to remain, so not removing the list element is the right thing
to do. Instead we should be reusing the element already on the
list.
There is already a code for that in lock_file() function in
lockfile.c. The code checks lk->next and the element is linked
only when it is not already on the list -- which is incorrect
for the last element on the list (which has NULL in its next
field), but if you read the check as "is this element already on
the list?" it actually makes sense. We do not want to link it
on the list again, nor we would want to set up signal/atexit
over and over.
Signed-off-by: Junio C Hamano <junkio@cox.net>
In some cases we did not even bother to check the return value of
mmap() and just assume it worked. This is bad, because if we are
out of virtual address space the kernel returned MAP_FAILED and we
would attempt to dereference that address, segfaulting without any
real error output to the user.
We are replacing all calls to mmap() with xmmap() and moving all
MAP_FAILED checking into that single location. If a mmap call
fails we try to release enough least-recently-used pack windows
to possibly succeed, then retry the mmap() attempt. If we cannot
mmap even after releasing pack memory then we die() as none of our
callers have any reasonable recovery strategy for a failed mmap.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
When ref@{N} is specified on a ref that has only M entries (M < N),
instead of saying the initial timestamp the reflog has, warn that
there is only M entries.
Signed-off-by: Junio C Hamano <junkio@cox.net>
