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real_path: remove unsafe API

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Returning a shared buffer invites very subtle bugs due to reentrancy or
multi-threading, as demonstrated by the previous patch.

There was an unfinished effort to abolish this [1].

Let's finally rid of `real_path()`, using `strbuf_realpath()` instead.

This patch uses a local `strbuf` for most places where `real_path()` was
previously called.

However, two places return the value of `real_path()` to the caller. For
them, a `static` local `strbuf` was added, effectively pushing the
problem one level higher:
    read_gitfile_gently()
    get_superproject_working_tree()

[1] https://lore.kernel.org/git/1480964316-99305-1-git-send-email-bmwill@google.com/

Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Alexandr Miloslavskiy
2020-03-10 13:11:22 +00:00
committed by Junio C Hamano
parent 0915a5b4cd
commit 3d7747e318
13 changed files with 59 additions and 24 deletions
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5
t/helper/test-path-utils.c
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@ -290,11 +290,14 @@ int cmd__path_utils(int argc, const char **argv)
}
if (argc >= 2 && !strcmp(argv[1], "real_path")) {
struct strbuf realpath = STRBUF_INIT;
while (argc > 2) {
puts(real_path(argv[2]));
strbuf_realpath(&realpath, argv[2], 1);
puts(realpath.buf);
argc--;
argv++;
}
strbuf_release(&realpath);
return 0;
}