В Thu, 6 Jun 2013 08:53:40 +0200 Lennart Poettering <lenn...@poettering.net> пишет:
> On Mon, 20.05.13 10:28, James Buren (r...@ymail.com) wrote: > > > Files such as /etc/machine-info have an incompatibility with systemd in > > regards to how > > it writes and/or parses them. Take the following sample: > > > > PRETTY_HOSTNAME="\'\"\$\`\\" > > > > Systemd will translate this to: '"$`\ > > However, the shells bash and dash will translate this to: \'"$`\ > > > > So, it appears to be that systemd is escaping single quotes when the shells > > themselves > > do not honor it for single quotes here. Thoughts for a solution? I ask > > because I have to > > write some systemd config files for a distro installer, and cannot use > > hostnamectl yet. > > Hmm, so let me see if I grok this. Bourne shells convert \' inside "" > quotes into \' while systemd converts it to '. Correct? > > If that's the case we probably something we should fix. However, to do > that I'd first need to understand the full logic here. For example, what > do bourne shells translate an unknown backslash-escaped sequence to? In > systemd we generally translate this to the same string, but with the \ > dropped. The shell appears to simply map it to the exact same string, > with the \ included. > > I guess we should do what we should have done in the first place: find > some docs about the precise Bourne shell escaping rules and reimplement > that. Anyone has some good docs? > Will The Open Group be enough? --><-- The <backslash> shall retain its special meaning as an escape character (see Escape Character (Backslash)) only when followed by one of the following characters when considered special: $ ` " \ <newline> --><-- http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_02_03 I'm too lazy to look up POSIX online :) _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
