Commit Graph

59828 Commits

Author SHA1 Message Date
Elijah Newren
7233f17577 clean: optimize and document cases where we recurse into subdirectories
Commit 6b1db43109 ("clean: teach clean -d to preserve ignored paths",
2017-05-23) added the following code block (among others) to git-clean:
    if (remove_directories)
        dir.flags |= DIR_SHOW_IGNORED_TOO | DIR_KEEP_UNTRACKED_CONTENTS;
The reason for these flags is well documented in the commit message, but
isn't obvious just from looking at the code.  Add some explanations to
the code to make it clearer.

Further, it appears git-2.26 did not correctly handle this combination
of flags from git-clean.  With both these flags and without
DIR_SHOW_IGNORED_TOO_MODE_MATCHING set, git is supposed to recurse into
all untracked AND ignored directories.  git-2.26.0 clearly was not doing
that.  I don't know the full reasons for that or whether git < 2.27.0
had additional unknown bugs because of that misbehavior, because I don't
feel it's worth digging into.  As per the huge changes and craziness
documented in commit 8d92fb2927 ("dir: replace exponential algorithm
with a linear one", 2020-04-01), the old algorithm was a mess and was
thrown out.  What I can say is that git-2.27.0 correctly recurses into
untracked AND ignored directories with that combination.

However, in clean's case we don't need to recurse into ignored
directories; that is just a waste of time.  Thus, when git-2.27.0
started correctly handling those flags, we got a performance regression
report.  Rather than relying on other bugs in fill_directory()'s former
logic to provide the behavior of skipping ignored directories, make use
of the DIR_SHOW_IGNORED_TOO_MODE_MATCHING value specifically added in
commit eec0f7f2b7 ("status: add option to show ignored files
differently", 2017-10-30) for this purpose.

Reported-by: Brian Malehorn <bmalehorn@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 17:27:16 -07:00
Elijah Newren
f7f5c6c0ba clean: consolidate handling of ignored parameters
I spent a long time trying to figure out how and whether the code worked
with different values of ignore, ignore_only, and remove_directories.
After lots of time setting up lots of testcases, sifting through lots of
print statements, and walking through the debugger, I finally realized
that one piece of code related to how it was all setup was found in
clean.c rather than dir.c.  Make a change that would have made it easier
for me to do the extra testing by putting this handling in one spot.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 17:27:16 -07:00
Elijah Newren
351ea1c3cb dir, clean: avoid disallowed behavior
dir.h documented quite clearly that DIR_SHOW_IGNORED and
DIR_SHOW_IGNORED_TOO are mutually exclusive, with a big comment to this
effect by the definition of both enum values.  However, a command like
   git clean -fx $DIR
would set both values for dir.flags.  I _think_ it happened to work
because:
  * As dir.h points out, DIR_KEEP_UNTRACKED_CONTENTS only takes effect
    if DIR_SHOW_IGNORED_TOO is set.
  * As coded, I believe DIR_SHOW_IGNORED would just happen to take
    precedence over DIR_SHOW_IGNORED_TOO in the code as currently
    constructed.
Which is a long way of saying "we just got lucky".

Fix clean.c to avoid setting these mutually exclusive values at the same
time, and add a check to dir.c that will throw a BUG() to prevent anyone
else from making this mistake.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 17:27:16 -07:00
Elijah Newren
e6c0be9239 dir: fix a few confusing comments
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 17:27:16 -07:00
Elijah Newren
e7d7c73249 git-sparse-checkout: clarify interactions with submodules
Ignoring the sparse-checkout feature momentarily, if one has a submodule and
creates local branches within it with unpushed changes and maybe adds some
untracked files to it, then we would want to avoid accidentally removing such
a submodule.  So, for example with git.git, if you run
   git checkout v2.13.0
then the sha1collisiondetection/ submodule is NOT removed even though it
did not exist as a submodule until v2.14.0.  Similarly, if you only had
v2.13.0 checked out previously and ran
   git checkout v2.14.0
the sha1collisiondetection/ submodule would NOT be automatically
initialized despite being part of v2.14.0.  In both cases, git requires
submodules to be initialized or deinitialized separately.  Further, we
also have special handling for submodules in other commands such as
clean, which requires two --force flags to delete untracked submodules,
and some commands have a --recurse-submodules flag.

sparse-checkout is very similar to checkout, as evidenced by the similar
name -- it adds and removes files from the working copy.  However, for
the same avoid-data-loss reasons we do not want to remove a submodule
from the working copy with checkout, we do not want to do it with
sparse-checkout either.  So submodules need to be separately initialized
or deinitialized; changing sparse-checkout rules should not
automatically trigger the removal or vivification of submodules.

I believe the previous wording in git-sparse-checkout.txt about
submodules was only about this particular issue.  Unfortunately, the
previous wording could be interpreted to imply that submodules should be
considered active regardless of sparsity patterns.  Update the wording
to avoid making such an implication.  It may be helpful to consider two
example situations where the differences in wording become important:

In the future, we want users to be able to run commands like
   git clone --sparse=moduleA --recurse-submodules $REPO_URL
and have sparsity paths automatically set up and have submodules *within
the sparsity paths* be automatically initialized.  We do not want all
submodules in any path to be automatically initialized with that
command.

Similarly, we want to be able to do things like
   git -c sparse.restrictCmds grep --recurse-submodules $REV $PATTERN
and search through $REV for $PATTERN within the recorded sparsity
patterns.  We want it to recurse into submodules within those sparsity
patterns, but do not want to recurse into directories that do not match
the sparsity patterns in search of a possible submodule.

Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 17:21:05 -07:00
Junio C Hamano
eebb51ba8c Merge branch 'hn/refs-cleanup'
Preliminary clean-ups around refs API, plus file format
specification documentation for the reftable backend.

* hn/refs-cleanup:
  reftable: define version 2 of the spec to accomodate SHA256
  reftable: clarify how empty tables should be written
  reftable: file format documentation
  refs: improve documentation for ref iterator
  t: use update-ref and show-ref to reading/writing refs
  refs.h: clarify reflog iteration order
2020-06-12 13:57:13 -07:00
Chris Torek
b7e10b2ca2 Documentation: usage for diff combined commits
Document the usage for producing combined commits with "git diff".
This includes updating the synopsis section.

While here, add the three-dot notation to the synopsis.

Make "git diff -h" print the same usage summary as the manual
page synopsis, minus the "A..B" form, which is now discouraged.

Signed-off-by: Chris Torek <chris.torek@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 10:53:44 -07:00
Chris Torek
8bfcb3a690 git diff: improve range handling
When git diff is given a symmetric difference A...B, it chooses
some merge base from the two specified commits (as documented).

This fails, however, if there is *no* merge base: instead, you
see the differences between A and B, which is certainly not what
is expected.

Moreover, if additional revisions are specified on the command
line ("git diff A...B C"), the results get a bit weird:

 * If there is a symmetric difference merge base, this is used
   as the left side of the diff.  The last final ref is used as
   the right side.
 * If there is no merge base, the symmetric status is completely
   lost.  We will produce a combined diff instead.

Similar weirdness occurs if you use, e.g., "git diff C A...B D".
Likewise, using multiple two-dot ranges, or tossing extra
revision specifiers into the command line with two-dot ranges,
or mixing two and three dot ranges, all produce nonsense.

To avoid all this, add a routine to catch the range cases and
verify that that the arguments make sense.  As a side effect,
produce a warning showing *which* merge base is being used when
there are multiple choices; die if there is no merge base.

Signed-off-by: Chris Torek <chris.torek@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 10:53:44 -07:00
Christian Couder
ea2c6e6083 upload-pack: refactor common code into do_got_oid()
As 'upload-pack.c' is now using 'struct upload_pack_data'
thoroughly, let's refactor some common code into a new
do_got_oid() function.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
f01c7916b8 upload-pack: move oldest_have to upload_pack_data
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's move the 'oldest_have' static variable
into this struct.

It is used by both protocol v0 and protocol v2 code.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
460ed0d4b4 upload-pack: pass upload_pack_data to got_oid()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to got_oid(), so that
this function can use all the fields of the struct.

This will be used in followup commits to move a static variable
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
0866734820 upload-pack: pass upload_pack_data to ok_to_give_up()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to ok_to_give_up(), so
that this function can use all the fields of the struct.

This will be used in followup commits to move a static variable
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
6fbbc4374f upload-pack: pass upload_pack_data to send_acks()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to send_acks(), so
that this function can use all the fields of the struct.

This will be used in followup commits to move a static variable
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
8dcf22785f upload-pack: pass upload_pack_data to process_haves()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to process_haves(), so
that this function can use all the fields of the struct.

This will be used in followup commits to move a static variable
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
629060d9bb upload-pack: change allow_unadvertised_object_request to an enum
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's change allow_unadvertised_object_request,
which is now part of 'upload_pack_data', from an 'unsigned int'
to an enum.

This will make it clear which values this variable can take.

While at it let's change this variable name to 'allow_uor' to
make it shorter.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
f1514c6aad upload-pack: move allow_unadvertised_object_request to upload_pack_data
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's move the 'allow_unadvertised_object_request'
static variable into this struct.

It is used by code common to protocol v0 and protocol v2.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:35 -07:00
Christian Couder
de0e9f7498 upload-pack: move extra_edge_obj to upload_pack_data
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's move the 'extra_edge_obj' static variable
into this struct.

It is used by code common to protocol v0 and protocol v2.

While at it let's properly initialize and clear 'extra_edge_obj'
in the appropriate 'upload_pack_data' initialization and
clearing functions.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:34 -07:00
Christian Couder
35b43a107c upload-pack: move shallow_nr to upload_pack_data
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's move the 'shallow_nr' static variable
into this struct.

It is used by code common to protocol v0 and protocol v2.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:34 -07:00
Christian Couder
329f996050 upload-pack: pass upload_pack_data to send_unshallow()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to send_unshallow(), so
that this function can use all the fields of the struct.

This will be used in followup commits to move static variables
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:34 -07:00
Christian Couder
446e42c559 upload-pack: pass upload_pack_data to deepen_by_rev_list()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to deepen_by_rev_list(),
so that this function can use all the fields of the struct.

This will be used in followup commits to move static variables
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:34 -07:00
Christian Couder
b1492f22f0 upload-pack: pass upload_pack_data to deepen()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to deepen(), so that
this function can use all the fields of the struct.

This will be used in followup commits to move static variables
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:34 -07:00
Christian Couder
ee703c8a43 upload-pack: pass upload_pack_data to send_shallow_list()
As we cleanup 'upload-pack.c' by using 'struct upload_pack_data'
more thoroughly, let's pass that struct to send_shallow_list(),
so that this function can use all the fields of the struct.

This will be used in followup commits to move static variables
into 'upload_pack_data'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-11 13:35:34 -07:00
Jonathan Tan
dd4b732df7 upload-pack: send part of packfile response as uri
Teach upload-pack to send part of its packfile response as URIs.

An administrator may configure a repository with one or more
"uploadpack.blobpackfileuri" lines, each line containing an OID, a pack
hash, and a URI. A client may configure fetch.uriprotocols to be a
comma-separated list of protocols that it is willing to use to fetch
additional packfiles - this list will be sent to the server. Whenever an
object with one of those OIDs would appear in the packfile transmitted
by upload-pack, the server may exclude that object, and instead send the
URI. The client will then download the packs referred to by those URIs
before performing the connectivity check.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
9da69a6539 fetch-pack: support more than one pack lockfile
Whenever a fetch results in a packfile being downloaded, a .keep file is
generated, so that the packfile can be preserved (from, say, a running
"git repack") until refs are written referring to the contents of the
packfile.

In a subsequent patch, a successful fetch using protocol v2 may result
in more than one .keep file being generated. Therefore, teach
fetch_pack() and the transport mechanism to support multiple .keep
files.

Implementation notes:

 - builtin/fetch-pack.c normally does not generate .keep files, and thus
   is unaffected by this or future changes. However, it has an
   undocumented "--lock-pack" feature, used by remote-curl.c when
   implementing the "fetch" remote helper command. In keeping with the
   remote helper protocol, only one "lock" line will ever be written;
   the rest will result in warnings to stderr. However, in practice,
   warnings will never be written because the remote-curl.c "fetch" is
   only used for protocol v0/v1 (which will not generate multiple .keep
   files). (Protocol v2 uses the "stateless-connect" command, not the
   "fetch" command.)

 - connected.c has an optimization in that connectivity checks on a ref
   need not be done if the target object is in a pack known to be
   self-contained and connected. If there are multiple packfiles, this
   optimization can no longer be done.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
acaaca7d70 upload-pack: refactor reading of pack-objects out
Subsequent patches will change how the output of pack-objects is
processed, so extract that processing into its own function.

Currently, at most 1 character can be buffered (in the "buffered" local
variable). One of those patches will require a larger buffer, so replace
that "buffered" local variable with a buffer array.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
cd8402e0fd Documentation: add Packfile URIs design doc
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
fd194dd56a Documentation: order protocol v2 sections
The current C Git implementation expects Git servers to follow a
specific order of sections when transmitting protocol v2 responses, but
this is not explicit in the documentation. Make the order explicit.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
8d5d2a34df http-fetch: support fetching packfiles by URL
Teach http-fetch the ability to download packfiles directly, given a
URL, and to verify them.

The http_pack_request suite has been augmented with a function that
takes a URL directly. With this function, the hash is only used to
determine the name of the temporary file.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
8e6adb69e1 http-fetch: refactor into function
cmd_main() in http-fetch.c will grow in a future patch, so refactor the
HTTP walking part into its own function.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
eb05349247 http: refactor finish_http_pack_request()
finish_http_pack_request() does multiple tasks, including some
housekeeping on a struct packed_git - (1) closing its index, (2)
removing it from a list, and (3) installing it. These concerns are
independent of fetching a pack through HTTP: they are there only because
(1) the calling code opens the pack's index before deciding to fetch it,
(2) the calling code maintains a list of packfiles that can be fetched,
and (3) the calling code fetches it in order to make use of its objects
in the same process.

In preparation for a subsequent commit, which adds a feature that does
not need any of this housekeeping, remove (1), (2), and (3) from
finish_http_pack_request(). (2) and (3) are now done by a helper
function, and (1) is the responsibility of the caller (in this patch,
done closer to the point where the pack index is opened).

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:34 -07:00
Jonathan Tan
9cb3cab560 http: use --stdin when indexing dumb HTTP pack
When Git fetches a pack using dumb HTTP, (among other things) it invokes
index-pack on a ".pack.temp" packfile, specifying the filename as an
argument.

A future commit will require the aforementioned invocation of index-pack
to also generate a "keep" file. To use this, we either have to use
index-pack's naming convention (because --keep requires the pack's
filename to end with ".pack") or to pass the pack through stdin. Of the
two, it is simpler to pass the pack through stdin.

Thus, teach http to pass --stdin to index-pack. As a bonus, the code is
now simpler.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 18:06:33 -07:00
Eric Sunshine
810382ed37 worktree: make "move" refuse to move atop missing registered worktree
"git worktree add" takes special care to avoid creating a new worktree
at a location already registered to an existing worktree even if that
worktree is missing (which can happen, for instance, if the worktree
resides on removable media). "git worktree move", however, is not so
careful when validating the destination location and will happily move
the source worktree atop the location of a missing worktree. This leads
to the anomalous situation of multiple worktrees being associated with
the same path, which is expressly forbidden by design. For example:

    $ git clone foo.git
    $ cd foo
    $ git worktree add ../bar
    $ git worktree add ../baz
    $ rm -rf ../bar
    $ git worktree move ../baz ../bar
    $ git worktree list
    .../foo beefd00f [master]
    .../bar beefd00f [bar]
    .../bar beefd00f [baz]
    $ git worktree remove ../bar
    fatal: validation failed, cannot remove working tree:
        '.../bar' does not point back to '.git/worktrees/bar'

Fix this shortcoming by enhancing "git worktree move" to perform the
same additional validation of the destination directory as done by "git
worktree add".

While at it, add a test to verify that "git worktree move" won't move a
worktree atop an existing (non-worktree) path -- a restriction which has
always been in place but was never tested.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 10:54:49 -07:00
Eric Sunshine
d179af679b worktree: generalize candidate worktree path validation
"git worktree add" checks that the specified path is a valid location
for a new worktree by ensuring that the path does not already exist and
is not already registered to another worktree (a path can be registered
but missing, for instance, if it resides on removable media). Since "git
worktree add" is not the only command which should perform such
validation ("git worktree move" ought to also), generalize the the
validation function for use by other callers, as well.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 10:54:49 -07:00
Eric Sunshine
916133ef8e worktree: prune linked worktree referencing main worktree path
"git worktree prune" detects when multiple entries are associated with
the same path and prunes the duplicates, however, it does not detect
when a linked worktree points at the path of the main worktree.
Although "git worktree add" disallows creating a new worktree with the
same path as the main worktree, such a case can arise outside the
control of Git even without the user mucking with .git/worktree/<id>/
administrative files. For instance:

    $ git clone foo.git
    $ git -C foo worktree add ../bar
    $ rm -rf bar
    $ mv foo bar
    $ git -C bar worktree list
    .../bar deadfeeb [master]
    .../bar deadfeeb [bar]

Help the user recover from such corruption by extending "git worktree
prune" to also detect when a linked worktree is associated with the path
of the main worktree.

Reported-by: Jonathan Müller <jonathanmueller.dev@gmail.com>
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 10:54:49 -07:00
Eric Sunshine
4a3ce479ce worktree: prune duplicate entries referencing same worktree path
A fundamental restriction of linked working trees is that there must
only ever be a single worktree associated with a particular path, thus
"git worktree add" explicitly disallows creation of a new worktree at
the same location as an existing registered worktree. Nevertheless,
users can still "shoot themselves in the foot" by mucking with
administrative files in .git/worktree/<id>/. Worse, "git worktree move"
is careless[1] and allows a worktree to be moved atop a registered but
missing worktree (which can happen, for instance, if the worktree is on
removable media). For instance:

    $ git clone foo.git
    $ cd foo
    $ git worktree add ../bar
    $ git worktree add ../baz
    $ rm -rf ../bar
    $ git worktree move ../baz ../bar
    $ git worktree list
    .../foo beefd00f [master]
    .../bar beefd00f [bar]
    .../bar beefd00f [baz]

Help users recover from this form of corruption by teaching "git
worktree prune" to detect when multiple worktrees are associated with
the same path.

[1]: A subsequent commit will fix "git worktree move" validation to be
     more strict.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 10:54:49 -07:00
Eric Sunshine
dd9609a12e worktree: make high-level pruning re-usable
The low-level logic for removing a worktree is well encapsulated in
delete_git_dir(). However, high-level details related to pruning a
worktree -- such as dealing with verbosity and dry-run mode -- are not
encapsulated. Factor out this high-level logic into its own function so
it can be re-used as new worktree corruption detectors are added.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 10:54:49 -07:00
Eric Sunshine
1b14d40b38 worktree: give "should be pruned?" function more meaningful name
Readers of the name prune_worktree() are likely to expect the function
to actually prune a worktree, however, it only answers the question
"should this worktree be pruned?". Give it a name more reflective of its
true purpose to avoid such confusion.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-10 10:54:49 -07:00
Chris Torek
bafa2d741e t/t3430: avoid undefined git diff behavior
The autosquash-and-exec test used "git diff HEAD^!" to mean
"git diff HEAD^ HEAD".  Use these directly instead of relying
on the undefined but actual-current behavior of "HEAD^!".

Signed-off-by: Chris Torek <chris.torek@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-09 15:13:56 -07:00
Han-Wen Nienhuys
ee9681d949 reftable: define version 2 of the spec to accomodate SHA256
Version appends a hash ID to the file header, making it slightly larger.

This commit also changes "SHA-1" into "object ID" in many places.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-09 13:48:36 -07:00
Han-Wen Nienhuys
10f007c370 reftable: clarify how empty tables should be written
The format allows for some ambiguity, as a lone footer also starts
with a valid file header. However, the current JGit code will barf on
this. This commit codifies this behavior into the standard.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-09 13:48:36 -07:00
Jonathan Nieder
35e6c47404 reftable: file format documentation
Shawn Pearce explains:

Some repositories contain a lot of references (e.g. android at 866k,
rails at 31k). The reftable format provides:

- Near constant time lookup for any single reference, even when the
  repository is cold and not in process or kernel cache.
- Near constant time verification if a SHA-1 is referred to by at least
  one reference (for allow-tip-sha1-in-want).
- Efficient lookup of an entire namespace, such as `refs/tags/`.
- Support atomic push `O(size_of_update)` operations.
- Combine reflog storage with ref storage.

This file format spec was originally written in July, 2017 by Shawn
Pearce.  Some refinements since then were made by Shawn and by Han-Wen
Nienhuys based on experiences implementing and experimenting with the
format.  (All of this was in the context of our work at Google and
Google is happy to contribute the result to the Git project.)

Imported from JGit[1]'s current version (c217d33ff,
"Documentation/technical/reftable: improve repo layout", 2020-02-04)
of Documentation/technical/reftable.md and converted to asciidoc by
running

  pandoc -t asciidoc -f markdown reftable.md >reftable.txt

using pandoc 2.2.1.  The result required the following additional
minor changes:

- removed the [TOC] directive to add a table of contents, since
  asciidoc does not support it
- replaced git-scm.com/docs links with linkgit: directives that link
  to other pages within Git's documentation

[1] https://eclipse.googlesource.com/jgit/jgit

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-09 13:48:17 -07:00
Junio C Hamano
0313f36c6e The second batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-08 18:06:32 -07:00
Junio C Hamano
0b925a469e Merge branch 'jt/curl-verbose-on-trace-curl'
Rewrite support for GIT_CURL_VERBOSE in terms of GIT_TRACE_CURL.

Looking good.

* jt/curl-verbose-on-trace-curl:
  http, imap-send: stop using CURLOPT_VERBOSE
  t5551: test that GIT_TRACE_CURL redacts password
2020-06-08 18:06:32 -07:00
Junio C Hamano
8d04c98866 Merge branch 'cc/upload-pack-data'
Code clean-up.

* cc/upload-pack-data:
  upload-pack: use upload_pack_data fields in receive_needs()
  upload-pack: pass upload_pack_data to create_pack_file()
  upload-pack: remove static variable 'stateless_rpc'
  upload-pack: pass upload_pack_data to check_non_tip()
  upload-pack: pass upload_pack_data to send_ref()
  upload-pack: move symref to upload_pack_data
  upload-pack: use upload_pack_data writer in receive_needs()
  upload-pack: pass upload_pack_data to receive_needs()
  upload-pack: pass upload_pack_data to get_common_commits()
  upload-pack: use 'struct upload_pack_data' in upload_pack()
  upload-pack: move 'struct upload_pack_data' around
  upload-pack: move {want,have}_obj to upload_pack_data
  upload-pack: remove unused 'wants' from upload_pack_data
2020-06-08 18:06:32 -07:00
Junio C Hamano
63e50b8678 Merge branch 'cb/bisect-helper-parser-fix'
The code to parse "git bisect start" command line was lax in
validating the arguments.

* cb/bisect-helper-parser-fix:
  bisect--helper: avoid segfault with bad syntax in `start --term-*`
2020-06-08 18:06:32 -07:00
Junio C Hamano
2bdf00e66a Merge branch 'js/checkout-p-new-file'
"git checkout -p" did not handle a newly added path at all.

* js/checkout-p-new-file:
  checkout -p: handle new files correctly
2020-06-08 18:06:31 -07:00
Junio C Hamano
b37fd14beb Merge branch 'dl/remote-curl-deadlock-fix'
On-the-wire protocol v2 easily falls into a deadlock between the
remote-curl helper and the fetch-pack process when the server side
prematurely throws an error and disconnects.  The communication has
been updated to make it more robust.

* dl/remote-curl-deadlock-fix:
  stateless-connect: send response end packet
  pkt-line: define PACKET_READ_RESPONSE_END
  remote-curl: error on incomplete packet
  pkt-line: extern packet_length()
  transport: extract common fetch_pack() call
  remote-curl: remove label indentation
  remote-curl: fix typo
2020-06-08 18:06:30 -07:00
Junio C Hamano
ded44afa02 Merge branch 'bc/filter-process'
Code simplification and test coverage enhancement.

* bc/filter-process:
  t2060: add a test for switch with --orphan and --discard-changes
  builtin/checkout: simplify metadata initialization
2020-06-08 18:06:30 -07:00
Junio C Hamano
a8ecd0190d Merge branch 'vs/complete-stash-show-p-fix'
The command line completion script (in contrib/) tried to complete
"git stash -p" as if it were "git stash push -p", but it was too
aggressive and also affected "git stash show -p", which has been
corrected.

* vs/complete-stash-show-p-fix:
  completion: don't override given stash subcommand with -p
2020-06-08 18:06:29 -07:00
Junio C Hamano
7e75aeb290 Merge branch 'rs/fsck-duplicate-names-in-trees'
The check in "git fsck" to ensure that the tree objects are sorted
still had corner cases it missed unsorted entries.

* rs/fsck-duplicate-names-in-trees:
  fsck: detect more in-tree d/f conflicts
  t1450: demonstrate undetected in-tree d/f conflict
  t1450: increase test coverage of in-tree d/f detection
  fsck: fix a typo in a comment
2020-06-08 18:06:29 -07:00