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author | github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> | 2022-10-21 00:05:50 +0000 |
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committer | GitHub <noreply@github.com> | 2022-10-21 00:05:50 +0000 |
commit | c43416535429396cc99bccf16e7fbe4c0adea4cf (patch) | |
tree | 7ff62b70be50a592d302fe76f007f94c5043751a /nixos/lib | |
parent | e674dd40b315eec88ac24691145387c202983eb6 (diff) | |
parent | dd2351ee2f2671d2f2216dd843e4997060eb9576 (diff) |
Merge master into staging-next
Diffstat (limited to 'nixos/lib')
-rw-r--r-- | nixos/lib/utils.nix | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/nixos/lib/utils.nix b/nixos/lib/utils.nix index f646f70323e35..9eefa80d1c8b7 100644 --- a/nixos/lib/utils.nix +++ b/nixos/lib/utils.nix @@ -39,11 +39,19 @@ rec { || hasPrefix a'.mountPoint b'.mountPoint || any (hasPrefix a'.mountPoint) b'.depends; - # Escape a path according to the systemd rules, e.g. /dev/xyzzy - # becomes dev-xyzzy. FIXME: slow. - escapeSystemdPath = s: - replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"] - (removePrefix "/" s); + # Escape a path according to the systemd rules. FIXME: slow + # The rules are described in systemd.unit(5) as follows: + # The escaping algorithm operates as follows: given a string, any "/" character is replaced by "-", and all other characters which are not ASCII alphanumerics, ":", "_" or "." are replaced by C-style "\x2d" escapes. In addition, "." is replaced with such a C-style escape when it would appear as the first character in the escaped string. + # When the input qualifies as absolute file system path, this algorithm is extended slightly: the path to the root directory "/" is encoded as single dash "-". In addition, any leading, trailing or duplicate "/" characters are removed from the string before transformation. Example: /foo//bar/baz/ becomes "foo-bar-baz". + escapeSystemdPath = s: let + replacePrefix = p: r: s: (if (hasPrefix p s) then r + (removePrefix p s) else s); + trim = s: removeSuffix "/" (removePrefix "/" s); + normalizedPath = strings.normalizePath s; + in + replaceChars ["/"] ["-"] + (replacePrefix "." (strings.escapeC ["."] ".") + (strings.escapeC (stringToCharacters " !\"#$%&'()*+,;<=>=@[\\]^`{|}~-") + (if normalizedPath == "/" then normalizedPath else trim normalizedPath))); # Quotes an argument for use in Exec* service lines. # systemd accepts "-quoted strings with escape sequences, toJSON produces |