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git clone <url> C:\cygwin\home\USER\repo' is working (again)

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A regression for cygwin users was introduced with commit 05b458c,
 "real_path: resolve symlinks by hand".

In the the commit message we read:
  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...

The old (and non-thread-save) OS calls chdir()/pwd() had been
replaced by a string operation.
The cygwin layer "knows" that "C:\cygwin" is an absolute path,
but the new string operation does not.

"git clone <url> C:\cygwin\home\USER\repo" fails like this:
fatal: Invalid path '/home/USER/repo/C:\cygwin\home\USER\repo'

The solution is to implement has_dos_drive_prefix(), skip_dos_drive_prefix()
is_dir_sep(), offset_1st_component() and convert_slashes() for cygwin
in the same way as it is done in 'Git for Windows' in compat/mingw.[ch]

Extract the needed code into compat/win32/path-utils.[ch] and use it
for cygwin as well.

Reported-by: Steven Penny <svnpenn@gmail.com>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Torsten Bögershausen
2018-12-15 05:33:30 +01:00
committed by Junio C Hamano
parent 98cdfbb84a
commit 1cadad6f65
9 changed files with 54 additions and 72 deletions
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28
compat/win32/path-utils.c Normal file
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#include "../../git-compat-util.h"
int win32_skip_dos_drive_prefix(char **path)
{
int ret = has_dos_drive_prefix(*path);
*path += ret;
return ret;
}
int win32_offset_1st_component(const char *path)
{
char *pos = (char *)path;
/* unc paths */
if (!skip_dos_drive_prefix(&pos) &&
is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
/* skip server name */
pos = strpbrk(pos + 2, "\\/");
if (!pos)
return 0; /* Error: malformed unc path */
do {
pos++;
} while (*pos && !is_dir_sep(*pos));
}
return pos + is_dir_sep(*pos) - path;
}