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archive-tar.c: guard config parser from value=NULL
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -222,7 +222,7 @@ static void write_global_extended_header(const unsigned char *sha1)
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static int git_tar_config(const char *var, const char *value)
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{
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if (!strcmp(var, "tar.umask")) {
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if (!strcmp(value, "user")) {
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if (value && !strcmp(value, "user")) {
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tar_umask = umask(0);
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umask(tar_umask);
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} else {
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