setup: convert setup_git_directory_gently_1 et al. to strbuf
Convert setup_git_directory_gently_1() and its helper functions setup_explicit_git_dir(), setup_discovered_git_dir() and setup_bare_git_dir() to use a struct strbuf to hold the current working directory. Replacing the PATH_MAX-sized buffer used before removes a path length limition on some file systems. The functions are converted all in one go because they all read and write the variable cwd. Signed-off-by: NRene Scharfe <l.s.r@web.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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