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![Torsten Bögershausen](/assets/img/avatar_default.png)
The following sequence leads to a "BUG" assertion running under MacOS: DIR=git-test-restore-p Adiarnfd=$(printf 'A\314\210') DIRNAME=xx${Adiarnfd}yy mkdir $DIR && cd $DIR && git init && mkdir $DIRNAME && cd $DIRNAME && echo "Initial" >file && git add file && echo "One more line" >>file && echo y | git restore -p . Initialized empty Git repository in /tmp/git-test-restore-p/.git/ BUG: pathspec.c:495: error initializing pathspec_item Cannot close git diff-index --cached --numstat [snip] The command `git restore` is run from a directory inside a Git repo. Git needs to split the $CWD into 2 parts: The path to the repo and "the rest", if any. "The rest" becomes a "prefix" later used inside the pathspec code. As an example, "/path/to/repo/dir-inside-repå" would determine "/path/to/repo" as the root of the repo, the place where the configuration file .git/config is found. The rest becomes the prefix ("dir-inside-repå"), from where the pathspec machinery expands the ".", more about this later. If there is a decomposed form, (making the decomposing visible like this), "dir-inside-rep°a" doesn't match "dir-inside-repå". Git commands need to: (a) read the configuration variable "core.precomposeunicode" (b) precocompose argv[] (c) precompose the prefix, if there was any The first commit,76759c7dff
"git on Mac OS and precomposed unicode" addressed (a) and (b). The call to precompose_argv() was added into parse-options.c, because that seemed to be a good place when the patch was written. Commands that don't use parse-options need to do (a) and (b) themselfs. The commands `diff-files`, `diff-index`, `diff-tree` and `diff` learned (a) and (b) in commit90a78b83e0
"diff: run arguments through precompose_argv" Branch names (or refs in general) using decomposed code points resulting in decomposed file names had been fixed in commit8e712ef6fc
"Honor core.precomposeUnicode in more places" The bug report from above shows 2 things: - more commands need to handle precomposed unicode - (c) should be implemented for all commands using pathspecs Solution: precompose_argv() now handles the prefix (if needed), and is renamed into precompose_argv_prefix(). Inside this function the config variable core.precomposeunicode is read into the global variable precomposed_unicode, as before. This reading is skipped if precomposed_unicode had been read before. The original patch for preocomposed unicode,76759c7dff
, placed precompose_argv() into parse-options.c Now add it into git.c::run_builtin() as well. Existing precompose calls in diff-files.c and others may become redundant, and if we audit the callflows that reach these places to make sure that they can never be reached without going through the new call added to run_builtin(), we might be able to remove these existing ones. But in this commit, we do not bother to do so and leave these precompose callsites as they are. Because precompose() is idempotent and can be called on an already precomposed string safely, this is safer than removing existing calls without fully vetting the callflows. There is certainly room for cleanups - this change intends to be a bug fix. Cleanups needs more tests in e.g. t/t3910-mac-os-precompose.sh, and should be done in future commits. [1] git-bugreport-2021-01-06-1209.txt (git can't deal with special characters) [2] https://lore.kernel.org/git/A102844A-9501-4A86-854D-E3B387D378AA@icloud.com/ Reported-by: Daniel Troger <random_n0body@icloud.com> Helped-By: Philippe Blain <levraiphilippeblain@gmail.com> Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef PRECOMPOSE_UNICODE_H
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#define PRECOMPOSE_UNICODE_H
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <iconv.h>
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typedef struct dirent_prec_psx {
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ino_t d_ino; /* Posix */
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size_t max_name_len; /* See below */
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unsigned char d_type; /* available on all systems git runs on */
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/*
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* See http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/dirent.h.html
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* NAME_MAX + 1 should be enough, but some systems have
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* NAME_MAX=255 and strlen(d_name) may return 508 or 510
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* Solution: allocate more when needed, see precompose_utf8_readdir()
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*/
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char d_name[NAME_MAX+1];
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} dirent_prec_psx;
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typedef struct {
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iconv_t ic_precompose;
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DIR *dirp;
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struct dirent_prec_psx *dirent_nfc;
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} PREC_DIR;
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const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix);
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void probe_utf8_pathname_composition(void);
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PREC_DIR *precompose_utf8_opendir(const char *dirname);
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struct dirent_prec_psx *precompose_utf8_readdir(PREC_DIR *dirp);
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int precompose_utf8_closedir(PREC_DIR *dirp);
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#ifndef PRECOMPOSE_UNICODE_C
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#define dirent dirent_prec_psx
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#define opendir(n) precompose_utf8_opendir(n)
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#define readdir(d) precompose_utf8_readdir(d)
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#define closedir(d) precompose_utf8_closedir(d)
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#define DIR PREC_DIR
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#endif /* PRECOMPOSE_UNICODE_C */
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#endif /* PRECOMPOSE_UNICODE_H */
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