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client: drop support for GNU readline

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GNU readline switched to GPLv3+ in version 6.0, which is incompatible
with the chrony's GPLv2 license.

Drop support for the readline library. Only editline is supported now.
This commit is contained in:
Miroslav Lichvar
2020-09-16 09:45:59 +02:00
parent c9b8f8bc70
commit f0a33e7b28
3 changed files with 4 additions and 92 deletions
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39
doc/installation.adoc
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@@ -100,7 +100,7 @@ than MD5, which can be used for NTP authentication with a symmetric key. If you
don't want to enable the support, specify the `--disable-sechash` flag to
`configure`.
If development files for the editline or readline library are available,
If development files for the editline library are available,
`chronyc` will be built with line editing support. If you don't want this,
specify the `--disable-readline` flag to `configure`.
@@ -170,43 +170,6 @@ https://github.com/seccomp/libseccomp[libseccomp] library and the
the kernel attack surface and possibly prevent kernel exploits from `chronyd`
if it is compromised.
== Support for line editing libraries
`chronyc` can be built with support for line editing, this allows you to use
the cursor keys to replay and edit old commands. Two libraries are supported
which provide such functionality, editline and GNU readline.
Please note that readline since version 6.0 is licensed under GPLv3+ which is
incompatible with chrony's license GPLv2. You should use editline instead if
you don't want to use older readline versions.
The `configure` script will automatically enable the line editing support if
one of the supported libraries is available. If they are both available, the
editline library will be used.
If you don't want to use it (in which case `chronyc` will use a minimal command
line interface), invoke `configure` like this:
----
./configure --disable-readline other-options...
----
If you have editline, readline or ncurses installed in locations that aren't
normally searched by the compiler and linker, you need to use extra options:
`--with-readline-includes=directory_name`::
This defines the name of the directory above the one where `readline.h` is.
`readline.h` is assumed to be in `editline` or `readline` subdirectory of the
named directory.
`--with-readline-library=directory_name`::
This defines the directory containing the `libedit.a` or `libedit.so` file,
or `libreadline.a` or `libreadline.so` file.
`--with-ncurses-library=directory_name`::
This defines the directory containing the `libncurses.a` or `libncurses.so`
file.
== Extra options for package builders
The `configure` and `make` procedures have some extra options that may be