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generator: Rewrite UUIDs that begin with zero byte.

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In util-linux <= 2.19, mkswap -U cannot handle the first byte of the
UUID being zero, so we artificially rewrite such UUIDs.

See: http://article.gmane.org/gmane.linux.utilities.util-linux-ng/4273
(cherry picked from commit 4ee190628b)
This commit is contained in:
Richard W.M. Jones
2011-06-13 18:58:53 +01:00
parent 4c8bab2f3e
commit dc6b633ea5
1 changed files with 8 additions and 0 deletions
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8
generator/generator_utils.ml
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@@ -55,6 +55,14 @@ let string_of_errcode = function
*)
let uuidgen () =
let s = Digest.to_hex (Digest.file "generator/generator_actions.ml") in
(* In util-linux <= 2.19, mkswap -U cannot handle the first byte of
* the UUID being zero, so we artificially rewrite such UUIDs.
* http://article.gmane.org/gmane.linux.utilities.util-linux-ng/4273
*)
if s.[0] = '0' && s.[1] = '0' then
s.[0] <- '1';
String.sub s 0 8 ^ "-"
^ String.sub s 8 4 ^ "-"
^ String.sub s 12 4 ^ "-"