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2017-01-09real_path: set errno when max number of symlinks is exceededLibravatar Brandon Williams1-0/+2
Set errno to ELOOP when the maximum number of symlinks is exceeded, as would be done by other symlink-resolving functions. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-01-09real_path: prevent redefinition of MAXSYMLINKSLibravatar Brandon Williams1-1/+3
The macro 'MAXSYMLINKS' is already defined on macOS and Linux in <sys/param.h>. If 'MAXSYMLINKS' has already been defined, use the value defined by the OS otherwise default to a value of 32 which is more inline with what is allowed by many systems. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-22real_path: canonicalize directory separators in root partsLibravatar Johannes Sixt1-12/+17
When an absolute path is resolved, resolution begins at the first path component after the root part. The root part is just copied verbatim, because it must not be inspected for symbolic links. For POSIX paths, this is just the initial slash, but on Windows, the root part has the forms c:\ or \\server\share. We do want to canonicalize the back-slashes in the root part because these parts are compared to the result of getcwd(), which does return a fully canonicalized path. Factor out a helper that splits off the root part, and have it canonicalize the copied part. This change was prompted because t1504-ceiling-dirs.sh caught a breakage in GIT_CEILING_DIRECTORIES handling on Windows. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Acked-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12real_path: create real_pathdupLibravatar Brandon Williams1-0/+13
Create real_pathdup which returns a caller owned string of the resolved realpath based on the provide path. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12real_path: convert real_path_internal to strbuf_realpathLibravatar Brandon Williams1-28/+25
Change the name of real_path_internal to strbuf_realpath. In addition push the static strbuf up to its callers and instead take as a parameter a pointer to a strbuf to use for the final result. This change makes strbuf_realpath reentrant. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12real_path: resolve symlinks by handLibravatar Brandon Williams1-61/+129
The current implementation of real_path uses chdir() in order to resolve symlinks. Unfortunately this isn't thread-safe as chdir() affects a process as a whole and not just an individual thread. Instead perform the symlink resolution by hand so that the calls to chdir() can be removed, making real_path one step closer to being reentrant. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-04-04Windows: shorten code by re-using convert_slashes()Libravatar Johannes Sixt1-4/+1
Make a few more spots more readable by using the recently introduced, Windows-specific helper. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-08-26abspath: convert absolute_path() to strbufLibravatar René Scharfe1-42/+4
Move most of the code of absolute_path() into the new function strbuf_add_absolute_path() and in the process transform it to use struct strbuf and xgetcwd() instead of a PATH_MAX-sized buffer, which can be too small on some file systems. Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-08-26abspath: convert real_path_internal() to strbufLibravatar René Scharfe1-44/+25
Use strbuf instead of fixed-sized buffers in real_path() in order to avoid the size limitations of the latter. Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-08-26abspath: use strbuf_getcwd() to remember original working directoryLibravatar René Scharfe1-4/+5
Store the original working directory in a strbuf instead of in a fixed-sized buffer, in order to be able to handle longer paths. Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-10Merge branch 'ap/path-max'Libravatar Junio C Hamano1-7/+9
* ap/path-max: Prevent buffer overflows when path is too long
2013-12-16Prevent buffer overflows when path is too longLibravatar Antoine Pelisse1-7/+9
Some buffers created with PATH_MAX length are not checked when being written, and can overflow if PATH_MAX is not big enough to hold the path. Replace those buffers by strbufs so that their size is automatically grown if necessary. They are created as static local variables to avoid reallocating memory on each call. Note that prefix_filename() returns this static buffer so each callers should copy or use the string immediately (this is currently true). Reported-by: Wataru Noguchi <wnoguchi.0727@gmail.com> Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-09abspath: trivial style fixLibravatar Felipe Contreras1-1/+1
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-10-16abspath.c: have SP around arithmetic operatorsLibravatar Junio C Hamano1-2/+2
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-08mingw: rename WIN32 cpp macro to GIT_WINDOWS_NATIVELibravatar Jonathan Nieder1-1/+1
Throughout git, it is assumed that the WIN32 preprocessor symbol is defined on native Windows setups (mingw and msvc) and not on Cygwin. On Cygwin, most of the time git can pretend this is just another Unix machine, and Windows-specific magic is generally counterproductive. Unfortunately Cygwin *does* define the WIN32 symbol in some headers. Best to rely on a new git-specific symbol GIT_WINDOWS_NATIVE instead, defined as follows: #if defined(WIN32) && !defined(__CYGWIN__) # define GIT_WINDOWS_NATIVE #endif After this change, it should be possible to drop the CYGWIN_V15_WIN32API setting without any negative effect. [rj: %s/WINDOWS_NATIVE/GIT_WINDOWS_NATIVE/g ] Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-10-29Introduce new function real_path_if_valid()Libravatar Michael Haggerty1-0/+5
The function is like real_path(), except that it returns NULL on error instead of dying. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Jeff King <peff@peff.net>
2012-10-29real_path_internal(): add comment explaining use of cwdLibravatar Michael Haggerty1-0/+7
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Jeff King <peff@peff.net>
2012-10-29Introduce new static function real_path_internal()Libravatar Michael Haggerty1-21/+72
It accepts a new parameter, die_on_error. If die_on_error is false, it simply cleans up after itself and returns NULL rather than dying. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Jeff King <peff@peff.net>
2012-09-06real_path(): properly handle nonexistent top-level pathsLibravatar Michael Haggerty1-1/+1
The change has two points: 1. Do not strip off a leading slash, because that erroneously turns an absolute path into a relative path. 2. Do not remove slashes from groups of multiple slashes; instead let chdir() handle them. It could be, for example, that it wants to leave leading double-slashes alone. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-09-06real_path(): reject the empty stringLibravatar Michael Haggerty1-0/+3
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-09-06absolute_path(): reject the empty stringLibravatar Michael Haggerty1-1/+3
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-11Reduce parse-options.o dependenciesLibravatar Dmitry Ivankov1-0/+28
Currently parse-options.o pulls quite a big bunch of dependencies. his complicates it's usage in contrib/ because it pulls external dependencies and it also increases executables size. Split off less generic and more internal to git part of parse-options.c to parse-options-cb.c. Move prefix_filename function from setup.c to abspath.c. abspath.o and wrapper.o pull each other, so it's unlikely to increase the dependencies. It was a dependency of parse-options.o that pulled many others. Now parse-options.o pulls just abspath.o, ctype.o, strbuf.o, usage.o, wrapper.o, libc directly and strlcpy.o indirectly. Signed-off-by: Dmitry Ivankov <divanorama@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-07-22Merge branch 'js/maint-add-path-stat-pwd'Libravatar Junio C Hamano1-1/+2
* js/maint-add-path-stat-pwd: get_pwd_cwd(): Do not trust st_dev/st_ino blindly
2011-07-11get_pwd_cwd(): Do not trust st_dev/st_ino blindlyLibravatar Johannes Schindelin1-1/+2
10c4c88 (Allow add_path() to add non-existent directories to the path, 2008-07-21) introduced get_pwd_cwd() function in order to favor $PWD when getenv("PWD") and getcwd() refer to the same directory but are different strings (e.g. the former gives a nicer looking name via a symbolic link to an uglier looking automounted path). The function tried to determine if two directories are the same by running stat(2) on both and comparing ino/dev fields. Unfortunately, stat() does not fill any ino or dev fields in msysgit. But there is a telltale: both ino and dev are 0 when they are not filled correctly, so let's be extra cautious. This happens to fix a bug in "get-receive-pack working_directory/" when the GIT_DIR would not be set correctly due to absolute_path(".") returning the wrong value. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-29Merge branch 'ef/maint-win-verify-path'Libravatar Junio C Hamano1-2/+2
* ef/maint-win-verify-path: verify_dotfile(): do not assume '/' is the path seperator verify_path(): simplify check at the directory boundary verify_path: consider dos drive prefix real_path: do not assume '/' is the path seperator A Windows path starting with a backslash is absolute
2011-05-27real_path: do not assume '/' is the path seperatorLibravatar Theo Niessink1-2/+2
real_path currently assumes it's input had '/' as path seperator. This assumption does not hold true for the code-path from prefix_path (on Windows), where real_path can be called before normalize_path_copy. Fix real_path so it doesn't make this assumption. Create a helper function to reverse-search for the last path-seperator in a string. Signed-off-by: Theo Niessink <theo@taletn.com> Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-17Name make_*_path functions more accuratelyLibravatar Carlos Martín Nieto1-2/+16
Rename the make_*_path functions so it's clearer what they do, in particlar make clear what the differnce between make_absolute_path and make_nonrelative_path is by renaming them real_path and absolute_path respectively. make_relative_path has an understandable name and is renamed to relative_path to maintain the name convention. The function calls have been replaced 1-to-1 in their usage. Signed-off-by: Carlos Martín Nieto <cmn@elego.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-16make_absolute_path: return the input path if it points to our bufferLibravatar Carlos Martín Nieto1-0/+4
Some codepaths call make_absolute_path with its own return value as input. In such a cases, return the path immediately. This fixes a valgrind-discovered error, whereby we tried to copy a string onto itself. Signed-off-by: Carlos Martín Nieto <cmn@elego.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-10-03Fix 'clone' failure at DOS root directory.Libravatar Eric Sunshine1-1/+5
Cloning via relative path fails for a project residing immediately under the root directory of a DOS drive. For instance, for project c:/foo, issuing "cd c:/" followed by "git clone foo bar" fails with error "Unable to find remote helper for 'c'". The problem is caused by make_nonrelative_path() incorrectly returning c://foo rather than c:/foo for input "foo". The bogus path c://foo is misinterpreted by transport_get() as a URL with unrecognized protocol "c", hence the missing remote helper error. Fix make_nonrelative_path() to return c:/foo rather than c://foo (and /foo rather than //foo on Unix). Resolves msysgit issue #501 [1] [PT: squashed in changes requested by Junio [2][3]] [1] http://code.google.com/p/msysgit/issues/detail?id=501 [2] http://marc.info/?l=git&m=128570102331652&w=2 [3] http://marc.info/?l=git&m=128573246704862&w=2 Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2010-02-14make_absolute_path(): Do not append redundant slashLibravatar Nguyễn Thái Ngọc Duy1-2/+3
When concatenating two paths, if the first one already have '/', do not put another '/' in between the two paths. Usually this is not the case as getcwd() won't return '/foo/bar/', except when you are standing at root, then it will return '/'. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-08-27abspath.c: move declaration of 'len' into inner block and use appropriate typeLibravatar Brandon Casey1-3/+3
The 'len' variable was declared at the beginning of the make_absolute_path function and also in an inner 'if' block which masked the outer declaration. It is only used in two 'if' blocks, so remove the outer declaration and make a new declaration inside the other 'if' block that uses 'len'. Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-27Use die_errno() instead of die() when checking syscallsLibravatar Thomas Rast1-6/+6
Lots of die() calls did not actually report the kind of error, which can leave the user confused as to the real problem. Use die_errno() where we check a system/library call that sets errno on failure, or one of the following that wrap such calls: Function Passes on error from -------- -------------------- odb_pack_keep open read_ancestry fopen read_in_full xread strbuf_read xread strbuf_read_file open or strbuf_read_file strbuf_readlink readlink write_in_full xwrite Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-12-17make_absolute_path(): check bounds when seeing an overlong symlinkLibravatar Junio C Hamano1-0/+2
Signed-off-by: Junio C Hamano <gitster@pobox.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-09is_directory(): a generic helper functionLibravatar Junio C Hamano1-1/+12
A simple "grep -e stat --and -e S_ISDIR" revealed there are many open-coded implementations of this function. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-25Allow add_path() to add non-existent directories to the pathLibravatar Johannes Sixt1-0/+36
This function had used make_absolute_path(); but this function dies if the directory that contains the entry whose relative path was supplied in the argument does not exist. This is a problem if the argument is, for example, "../libexec/git-core", and that "../libexec" does not exist. Since the resolution of symbolic links is not required for elements in PATH, we can fall back to using make_nonrelative_path(), which simply prepends $PWD to the path. We have to move make_nonrelative_path() alongside make_absolute_path() in abspath.c so that git-shell can be linked. See 5b8e6f85f. Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-27shrink git-shell by avoiding redundant dependenciesLibravatar Dmitry Potapov1-0/+68
A lot of modules that have nothing to do with git-shell functionality were linked in, bloating git-shell more than 8 times. This patch cuts off redundant dependencies by: 1. providing stubs for three functions that make no sense for git-shell; 2. moving quote_path_fully from environment.c to quote.c to make the later self sufficient; 3. moving make_absolute_path into a new separate file. The following numbers have been received with the default optimization settings on master using GCC 4.1.2: Before: text data bss dec hex filename 143915 1348 93168 238431 3a35f git-shell After: text data bss dec hex filename 17670 788 8232 26690 6842 git-shell Signed-off-by: Junio C Hamano <gitster@pobox.com>
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