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2018-10-22diff: don't attempt to strip prefix from absolute Windows pathsLibravatar Johannes Sixt1-0/+10
git diff can be invoked with absolute paths. Typically, this triggers the --no-index case. Then the absolute paths remain in the file names that are printed in the output. There is one peculiarity, though: When the command is invoked from a a sub-directory in a repository, then it is attempted to strip the sub-directory from the beginning of relative paths. Yet, to detect a relative path the code just checks for an initial forward slash. This mistakes a Windows style path like "D:/base" as a relative path and the output looks like this, for example: D:\dir\test\one>git -P diff --numstat D:\dir\base D:\dir\diff 1 1 ir/{base => diff}/1.txt where the correct output should be D:\dir\test\one>git -P diff --numstat D:\dir\base D:\dir\diff 1 1 D:/dir/{base => diff}/1.txt If the sub-directory where 'git diff' is invoked is sufficiently deep that the prefix becomes longer than the path to be printed, then the subsequent code accesses the path out of bounds. Use is_absolute_path() to detect Windows style absolute paths. One might wonder whether the check for a directory separator that is visible in the patch context should be changed from == '/' to is_dir_sep() or not. It turns out not to be necessary. That code only ever investigates paths that have undergone pathspec normalization, after which there are only forward slashes even on Windows. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-09-13diff: always try to set up the repositoryLibravatar Jeff King1-0/+20
If we see an explicit "--no-index", we do not bother calling setup_git_directory_gently() at all. This means that we may miss out on reading repo-specific config. It's arguable whether this is correct or not. If we were designing from scratch, making "git diff --no-index" completely ignore the repository makes some sense. But we are nowhere near scratch, so let's look at the existing behavior: 1. If you're in the top-level of a repository and run an explicit "diff --no-index", the config subsystem falls back to reading ".git/config", and we will respect repo config. 2. If you're in a subdirectory of a repository, then we still try to read ".git/config", but it generally doesn't exist. So "diff --no-index" there does not respect repo config. 3. If you have $GIT_DIR set in the environment, we read and respect $GIT_DIR/config, 4. If you run "git diff /tmp/foo /tmp/bar" to get an implicit no-index, we _do_ run the repository setup, and set $GIT_DIR (or respect an existing $GIT_DIR variable). We find the repo config no matter where we started, and respect it. So we already respect the repository config in a number of common cases, and case (2) is the only one that does not. And at least one of our tests, t4034, depends on case (1) behaving as it does now (though it is just incidental, not an explicit test for this behavior). So let's bring case (2) in line with the others by always running the repository setup, even with an explicit "--no-index". We shouldn't need to change anything else, as the implicit case already handles the prefix. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-09-13diff: handle --no-index prefixes consistentlyLibravatar Jeff King1-0/+18
If we see an explicit "git diff --no-index ../foo ../bar", then we do not set up the git repository at all (we already know we are in --no-index mode, so do not have to check "are we in a repository?"), and hence have no "prefix" within the repository. A patch generated by this command will have the filenames "a/../foo" and "b/../bar", no matter which directory we are in with respect to any repository. However, in the implicit case, where we notice that the files are outside the repository, we will have chdir()'d to the top-level of the repository. We then feed the prefix back to the diff machinery. As a result, running the same diff from a subdirectory will result in paths that look like "a/subdir/../../foo". Besides being unnecessarily long, this may also be confusing to the user: they don't care about the subdir or the repository at all; it's just where they happened to be when running the command. We should treat this the same as the explicit --no-index case. One way to address this would be to chdir() back to the original path before running our diff. However, that's a bit hacky, as we would also need to adjust $GIT_DIR, which could be a relative path from our top-level. Instead, we can reuse the diff machinery's RELATIVE_NAME option, which automatically strips off the prefix. Note that this _also_ restricts the diff to this relative prefix, but that's OK for our purposes: we queue our own diff pairs manually, and do not rely on that part of the diff code. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-05Merge branch 'jc/diff-no-index-d-f'Libravatar Junio C Hamano1-0/+34
The usual "git diff" when seeing a file turning into a directory showed a patchset to remove the file and create all files in the directory, but "git diff --no-index" simply refused to work. Also, when asked to compare a file and a directory, imitate POSIX "diff" and compare the file with the file with the same name in the directory, instead of refusing to run. * jc/diff-no-index-d-f: diff-no-index: align D/F handling with that of normal Git diff-no-index: DWIM "diff D F" into "diff D/F F"
2015-03-26diff-no-index: align D/F handling with that of normal GitLibravatar Junio C Hamano1-0/+12
When a commit changes a path P that used to be a file to a directory and creates a new path P/X in it, "git show" would say that file P was removed and file P/X was created for such a commit. However, if we compare two directories, D1 and D2, where D1 has a file D1/P in it and D2 has a directory D2/P under which there is a file D2/P/X, and ask "git diff --no-index D1 D2" to show their differences, we simply get a refusal "file/directory conflict". Surely, that may be what GNU diff does, but we can do better and it is easy to do so. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-03-25diff-no-index: DWIM "diff D F" into "diff D/F F"Libravatar Junio C Hamano1-0/+22
"git diff --no-index" was supposed to be a poor-man's approach to allow using Git diff goodies outside of a Git repository, without having to patch mainstream diff implementations. Unlike a POSIX diff that treats "diff D F" (or "diff F D") as a request to compare D/F and F (or F and D/F) when D is a directory and F is a file, however, we did not accept such a command line and instead barfed with "file/directory conflict". Imitate what POSIX diff does and append the basename of the file after the name of the directory before comparing. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-03-20t: use test_expect_code instead of hand-rolled comparisonLibravatar Jeff King1-2/+2
This makes our output in the event of a failure slightly nicer, and it means that we do not break the &&-chain. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-16diff: add test for --no-index executed outside repoLibravatar Thomas Gummerer1-0/+11
470faf9 diff: move no-index detection to builtin/diff.c breaks the error message for "git diff --no-index", when the command is executed outside of a git repository and the wrong number of arguments are given. 6df5762 diff: don't read index when --no-index is given fixes the problem. Add a test to guard against similar breakages in the future. Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-12diff: don't read index when --no-index is givenLibravatar Thomas Gummerer1-0/+15
git diff --no-index ... currently reads the index, during setup, when calling gitmodules_config(). This results in worse performance when the index is not actually needed. This patch avoids calling gitmodules_config() when the --no-index option is given. The times for executing "git diff --no-index" in the WebKit repository are improved as follows: Test HEAD~3 HEAD ------------------------------------------------------------------ 4001.1: diff --no-index 0.24(0.15+0.09) 0.01(0.00+0.00) -95.8% An additional improvement of this patch is that "git diff --no-index" no longer breaks when the index file is corrupt, which makes it possible to use it for investigating the broken repository. To improve the possible usage as investigation tool for broken repositories, setup_git_directory_gently() is also not called when the --no-index option is given. Also add a test to guard against future breakages, and a performance test to show the improvements. Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-06-22diff: handle relative paths in no-indexLibravatar Jeff King1-1/+14
When diff-no-index is given a relative path to a file outside the repository, it aborts with error. However, if the file is given using an absolute path, the diff runs as expected. The two cases should be treated the same. Tests and commit message by Tim Henigan. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Tim Henigan <tim.henigan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-05-16diff --no-index: reset temporary buffer lengths on directory iterationLibravatar Bobby Powers1-0/+19
Commit 875b91b (diff --no-index: use strbuf for temporary pathnames, 2012-04-25) introduced a regression when using diff --no-index with directories. When iterating through a directory, the switch to strbuf from heap-allocated char arrays caused paths to form like 'dir/file1', 'dir/file1file2', rather than 'dir/file1', 'dir/file2' as expected. Avoid this by resetting the paths variables to their original length before each iteration. Signed-off-by: Bobby Powers <bobbypowers@gmail.com> Reviewed-by: René Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>