git/diff-no-index.c, branch v1.8.2.2

Merge branch 'jk/maint-null-in-trees'

2012-08-27T18:54:28Z

We do not want a link to 0{40} object stored anywhere in our objects. * jk/maint-null-in-trees: fsck: detect null sha1 in tree entries do not write null sha1s to on-disk index diff: do not use null sha1 as a sentinel value

Merge branch 'tr/void-diff-setup-done'

2012-08-22T18:52:27Z

Remove unnecessary code. * tr/void-diff-setup-done: diff_setup_done(): return void

diff_setup_done(): return void

2012-08-03T19:11:07Z

diff_setup_done() has historically returned an error code, but lost the last nonzero return in 943d5b7 (allow diff.renamelimit to be set regardless of -M/-C, 2006-08-09). The callers were in a pretty confused state: some actually checked for the return code, and some did not. Let it return void, and patch all callers to take this into account. This conveniently also gets rid of a handful of different(!) error messages that could never be triggered anyway. Note that the function can still die(). Signed-off-by: Thomas Rast Signed-off-by: Junio C Hamano

diff: do not use null sha1 as a sentinel value

2012-07-29T22:04:32Z

The diff code represents paths using the diff_filespec struct. This struct has a sha1 to represent the sha1 of the content at that path, as well as a sha1_valid member which indicates whether its sha1 field is actually useful. If sha1_valid is not true, then the filespec represents a working tree file (e.g., for the no-index case, or for when the index is not up-to-date). The diff_filespec is only used internally, though. At the interfaces to the diff subsystem, callers feed the sha1 directly, and we create a diff_filespec from it. It's at that point that we look at the sha1 and decide whether it is valid or not; callers may pass the null sha1 as a sentinel value to indicate that it is not. We should not typically see the null sha1 coming from any other source (e.g., in the index itself, or from a tree). However, a corrupt tree might have a null sha1, which would cause "diff --patch" to accidentally diff the working tree version of a file instead of treating it as a blob. This patch extends the edges of the diff interface to accept a "sha1_valid" flag whenever we accept a sha1, and to use that flag when creating a filespec. In some cases, this means passing the flag through several layers, making the code change larger than would be desirable. One alternative would be to simply die() upon seeing corrupted trees with null sha1s. However, this fix more directly addresses the problem (while bogus sha1s in a tree are probably a bad thing, it is really the sentinel confusion sending us down the wrong code path that is what makes it devastating). And it means that git is more capable of examining and debugging these corrupted trees. For example, you can still "diff --raw" such a tree to find out when the bogus entry was introduced; you just cannot do a "--patch" diff (just as you could not with any other corrupted tree, as we do not have any content to diff). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano

Merge branch 'jc/refactor-diff-stdin'

2012-07-13T22:38:05Z

Due to the way "git diff --no-index" is bolted onto by touching the low level code that is shared with the rest of the "git diff" code, even though it has to work in a very different way, any comparison that involves a file "-" at the root level incorrectly tried to read from the standard input. This cleans up the no-index codepath further to remove code that reads from the standard input from the core side, which is never necessary when git is running its usual diff operation. * jc/refactor-diff-stdin: diff-index.c: "git diff" has no need to read blob from the standard input diff-index.c: unify handling of command line paths diff-index.c: do not pretend paths are pathspecs

Merge branch 'th/diff-no-index-fixes'

2012-07-05T06:40:38Z

"git diff --no-index" did not correctly handle relative paths and did not give correct exit codes when run under "--quiet" option. * th/diff-no-index-fixes: diff-no-index: exit(1) if 'diff --quiet ' finds changes diff: handle relative paths in no-index

diff-index.c: "git diff" has no need to read blob from the standard input

2012-06-28T23:18:19Z

Only "diff --no-index -" does. Bolting the logic into the low-level function diff_populate_filespec() was a layering violation from day one. Move populate_from_stdin() function out of the generic diff.c to its only user, diff-index.c. Also make sure "-" from the command line stays a special token "read from the standard input", even if we later decide to sanitize the result from prefix_filename() function in a few obvious ways, e.g. removing unnecessary "./" prefix, duplicated slashes "//" in the middle, etc. Signed-off-by: Junio C Hamano

diff-index.c: unify handling of command line paths

2012-06-28T23:09:40Z

Regardless of where in the directory hierarchy you are, "-" on the command line means the standard input. The old code knew too much about how the low level machinery uses paths to read from the working tree and did not bother to have the same check for "-" when the command is run from the top-level. Unify the codepaths for subdirectory case and toplevel case into one and make it clearer. Signed-off-by: Junio C Hamano

diff-index.c: do not pretend paths are pathspecs

2012-06-28T23:09:40Z

"git diff --no-index" takes exactly two paths, not pathspecs, and has its own way queue_diff() to populate the diff_queue. Do not call diff_tree_setup_paths(), pretending as it takes pathspecs. Signed-off-by: Junio C Hamano

diff-no-index: exit(1) if 'diff --quiet ' finds changes

2012-06-22T17:26:13Z

When running 'git diff --quiet ', if file1 or file2 is outside the repository, it will exit(0) even if the files differ. It should exit(1) when they differ. This happens because 'diff_no_index' looks at the 'found_changes' member from 'diff_options' to determine if changes were made. This is the wrong thing to do, since it is only set if xdiff is actually run and it finds a change (the diff machinery will optimize out the xdiff call when it is not necessary) and in that case HAS_CHANGED flag needs to be taken into account. Use diff_result_code() that knows all these details for the correct exit value instead. Signed-off-by: Tim Henigan Signed-off-by: Junio C Hamano