wyu
eb5ee83c1f
fstab_filter_options() used strv_split_full(..., EXTRACT_UNESCAPE_SEPARATORS |
EXTRACT_UNESCAPE_RELAX), which unescapes "\," and "\\" while splitting, and then
strv_join_full(escape_separator=true) to re-escape the kept options. The round-trip
was lossy for invalid escapes kept verbatim by RELAX (e.g. an option value "\xff"
became "\\xff"), so the generated Options= line diverged from the input. A trailing
backslash was also collapsed: "val1\\" in the fstab became "val1\" in the split
word, which let the backslash escape the option separator in Options= (issue #42787).
Rework fstab_filter_options() to split with EXTRACT_UNESCAPE_RELAX only, so the
escape sequences of kept options are preserved verbatim and the filtered output is
assembled with the plain strv_join(); the matching option values are unescaped
manually so callers keep getting the unescaped form they had before.
Fixes a bug introduced by d4d9f034b1.
Fixes #42787.
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