setup_git_directory_gently_1(): resolve symlinks in ceiling paths
longest_ancestor_length() relies on a textual comparison of directory parts to find the part of path that overlaps with one of the paths in prefix_list. But this doesn't work if any of the prefixes involves a symbolic link, because the directories will look different even though they might logically refer to the same directory. So canonicalize the paths listed in GIT_CEILING_DIRECTORIES using real_path_if_valid() before passing them to longest_ancestor_length(). (Also rename normalize_ceiling_entry() to canonicalize_ceiling_entry() to reflect the change.) path is already in canonical form, so doesn't need to be canonicalized again. This fixes some problems with using GIT_CEILING_DIRECTORIES that contains paths involving symlinks, including t4035 if run with --root set to a path involving symlinks. Please note that test t0060 is *not* changed analogously, because that would make the test suite results dependent on the contents of the local root directory. However, real_path() is already tested independently, and the "ancestor" tests cover the non-normalization aspects of longest_ancestor_length(), so coverage remains sufficient. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Jeff King <peff@peff.net>
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26
setup.c
26
setup.c
@ -622,24 +622,23 @@ static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_
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}
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/*
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* A "string_list_each_func_t" function that normalizes an entry from
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* GIT_CEILING_DIRECTORIES or discards it if unusable.
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* A "string_list_each_func_t" function that canonicalizes an entry
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* from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
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* discards it if unusable.
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*/
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static int normalize_ceiling_entry(struct string_list_item *item, void *unused)
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static int canonicalize_ceiling_entry(struct string_list_item *item,
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void *unused)
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{
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const char *ceil = item->string;
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int len = strlen(ceil);
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char buf[PATH_MAX+1];
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char *ceil = item->string;
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const char *real_path;
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if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
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if (!*ceil || !is_absolute_path(ceil))
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return 0;
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if (normalize_path_copy(buf, ceil) < 0)
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real_path = real_path_if_valid(ceil);
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if (!real_path)
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return 0;
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len = strlen(buf);
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if (len > 1 && buf[len-1] == '/')
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buf[--len] = '\0';
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free(item->string);
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item->string = xstrdup(buf);
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item->string = xstrdup(real_path);
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return 1;
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}
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@ -681,7 +680,8 @@ static const char *setup_git_directory_gently_1(int *nongit_ok)
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if (env_ceiling_dirs) {
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string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
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filter_string_list(&ceiling_dirs, 0, normalize_ceiling_entry, NULL);
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filter_string_list(&ceiling_dirs, 0,
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canonicalize_ceiling_entry, NULL);
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ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
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string_list_clear(&ceiling_dirs, 0);
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}
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