Readline Share Library Missing
When I run a script that calls rlwrap, I got this error on Ubuntu 18.04
rlwrap: error while loading shared libraries: libreadline.so.6: cannot open shared object file: No such file or directory
Looks like it is missing the readline library. Searching Ubuntu package repositories
$ apt search libreadline
libreadline-dev/bionic 7.0-3 amd64
GNU readline and history libraries, development files
libreadline-gplv2-dev/bionic 5.2+dfsg-3build1 amd64
GNU readline and history libraries, development files
libreadline-java/bionic 0.8.0.1+dfsg-6 amd64
GNU readline and BSD editline wrappers for Java
libreadline-java-doc/bionic,bionic 0.8.0.1+dfsg-6 all
API docs for readline/editline wrappers for Java
libreadline5/bionic,now 5.2+dfsg-3build1 amd64 [installed]
GNU readline and history libraries, run-time libraries
libreadline5-dbg/bionic 5.2+dfsg-3build1 amd64
GNU readline and history libraries, debugging libraries
libreadline7/bionic,now 7.0-3 amd64 [installed]
GNU readline and history libraries, run-time libraries
libreadline7-dbg/bionic 7.0-3 amd64
GNU readline and history libraries, debugging libraries
Checking on the libreadline6 library, it was deleted on 2017-12-06 from this Debian bug. The reason for deletion being
(From Debian) ROM; obsolete version of readline;
What is Readline
Readline is the library that allows you to- move the text cursor in command line
- search history
- copy and paste
- tab completion
- and so on
Using Readline 5 and Readline 7
Let's see if the other versions of Readline has been installed on the system
$ sudo apt install libreadline5
Reading package lists... Done
Building dependency tree
Reading state information... Done
libreadline5 is already the newest version (5.2+dfsg-3build1).
0 upgraded, 0 newly installed, 0 to remove and 15 not upgraded.
$ sudo apt install libreadline7
Reading package lists... Done
Building dependency tree
Reading state information... Done
libreadline7 is already the newest version (7.0-3).
0 upgraded, 0 newly installed, 0 to remove and 15 not upgraded.
Unfortunately the script still requires the Readline version 6
rlwrap: error while loading shared libraries: libreadline.so.6: cannot open shared object file: No such file or directory
libreadline-dev
From my understanding of the error message, I thought Readline 6 is required. I am going to try installing libreadline-dev anyway, to see if it has the pkg-config files and recompile rlwrap with libreadline7.
$ sudo apt install libreadline-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
readline-doc
The following NEW packages will be installed:
libreadline-dev
0 upgraded, 1 newly installed, 0 to remove and 15 not upgraded.
Need to get 133 kB of archives.
After this operation, 728 kB of additional disk space will be used.
Get:1 http://xco-engapt.xilinx.com/ubuntu180401 bionic/main amd64 libreadline-de
v amd64 7.0-3 [133 kB]
Fetched 133 kB in 1s (90.8 kB/s)
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package libreadline-dev:amd64.
(Reading database ... 328880 files and directories currently installed.)
Preparing to unpack .../libreadline-dev_7.0-3_amd64.deb ...
Unpacking libreadline-dev:amd64 (7.0-3) ...
Processing triggers for install-info (6.5.0.dfsg.1-2) ...
Setting up libreadline-dev:amd64 (7.0-3) ...
Let's take a look at the content
$ dpkg -L libreadline-de
v
/.
/usr
/usr/include
/usr/include/readline
/usr/include/readline
/usr/include/readline/chardefs.h
/usr/include/readline/history.h
/usr/include/readline/keymaps.h
/usr/include/readline/readline.h
/usr/include/readline/rlconf.h
/usr/include/readline/rlstdc.h
/usr/include/readline/rltypedefs.h
/usr/include/readline/tilde.h
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libhistory.a
/usr/lib/x86_64-linux-gnu/libreadline.a
/usr/share
/usr/share/doc
/usr/share/info
/usr/lib/x86_64-linux-gnu/libhistory.so
/usr/lib/x86_64-linux-gnu/libreadline.so
/usr/share/doc/libreadline-dev
Hmmm... there's a /usr/lib/x86_64-linux-gnu/libreadline.so . Let's try to recompile and see if it works
$ ./configure
...
...
...
checking readline/readline.h usability... yes
checking readline/readline.h presence... yes
checking for readline/readline.h... yes
checking whether your readline headers and library know about rl_set_screen_size
... yes
checking whether your readline headers and library know about rl_basic_quote_cha
racters... yes
checking whether your readline headers and library know about rl_variable_value.
.. yes
checking whether your readline headers and library know about rl_readline_versio
n... yes
checking whether your readline headers and library know about rl_executing_keyse
q... yes
checking whether the private symbol _rl_horizontal_scroll_mode is visble in your
readline libs... yes
Will rlwrap find command's working directory under /proc/commands pid=""/cwd? let
's see...
checking for /proc/5269/cwd/configure.ac... yes
checking whether we can find command line under opt_proc_mountpoint/pid/cmdl
ine and mirror it by overwriting our own *argv... yes
checking that generated files are newer than configure... done
checking that generated files are newer than configure... done
configure: creating ./config.status/pid/opt_proc_mountpoint/commands
And now build the binary
$ make
make all-recursive
make[1]: Entering directory '/Github/rlwrap'
Making all in doc
make[2]: Entering directory '/Github/rlwrap/doc'
sed -e 's#@DATADIR@#/usr/local/share#' rlwrap.man > rlwrap.1
make[2]: Leaving directory '/Github/rlwrap/doc'
Making all in src
make[2]: Entering directory '/Github/rlwrap/src'
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT main.
o -MD -MP -MF .deps/main.Tpo -c -o main.o main.c
mv -f .deps/main.Tpo .deps/main.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT signa
ls.o -MD -MP -MF .deps/signals.Tpo -c -o signals.o signals.c
mv -f .deps/signals.Tpo .deps/signals.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT readlmv -f .deps/signals.Tpo .deps/signals.Po [84/1892]
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT readl
ine.o -MD -MP -MF .deps/readline.Tpo -c -o readline.o readline.c
mv -f .deps/readline.Tpo .deps/readline.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT pty.o
-MD -MP -MF .deps/pty.Tpo -c -o pty.o pty.c
mv -f .deps/pty.Tpo .deps/pty.Po
rbgen completion.rb completion.c || echo "You don't seem to have rbgen (http://l
ibredblack.sourceforge.net/). If you didn't change any .rb files, this is not a
problem"
/bin/sh: rbgen: command not found
You don't seem to have rbgen (http://libredblack.sourceforge.net/). If you didn'
t change any .rb files, this is not a problem
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT compl
etion.o -MD -MP -MF .deps/completion.Tpo -c -o completion.o completion.c
mv -f .deps/completion.Tpo .deps/completion.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT term.
o -MD -MP -MF .deps/term.Tpo -c -o term.o term.c
mv -f .deps/term.Tpo .deps/term.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT ptytt
y.o -MD -MP -MF .deps/ptytty.Tpo -c -o ptytty.o ptytty.c
mv -f .deps/ptytty.Tpo .deps/ptytty.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT utils
.o -MD -MP -MF .deps/utils.Tpo -c -o utils.o utils.c
mv -f .deps/utils.Tpo .deps/utils.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT strin
g_utils.o -MD -MP -MF .deps/string_utils.Tpo -c -o string_utils.o string_utils.c
mv -f .deps/string_utils.Tpo .deps/string_utils.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT mallo
mv -f .deps/string_utils.Tpo .deps/string_utils.Po [57/1892]
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT mallo
c_debug.o -MD -MP -MF .deps/malloc_debug.Tpo -c -o malloc_debug.o malloc_debug.c
mv -f .deps/malloc_debug.Tpo .deps/malloc_debug.Po
gcc -DHAVE_CONFIG_H -I. -I.. -DDATADIR=\"/usr/local/share\" -g -O2 -MT filte
r.o -MD -MP -MF .deps/filter.Tpo -c -o filter.o filter.c
mv -f .deps/filter.Tpo .deps/filter.Po
gcc -DDATADIR=\"/usr/local/share\" -g -O2 -o rlwrap main.o signals.o readline
.o pty.o completion.o term.o ptytty.o utils.o string_utils.o malloc_debug.o filt
er.o -lutil -lreadline -ltinfo
make[2]: Leaving directory '/Github/rlwrap/src'
Making all in filters
make[2]: Entering directory '/Github/rlwrap/filters'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/Github/rlwrap/filters'
make[2]: Entering directory '/Github/rlwrap'
make[2]: Leaving directory '/Github/rlwrap'
make[1]: Leaving directory '/Github/rlwrap'
And let's try the script that calls rlwrap again
$ ggv macos src
grep: src: Is a directory
grep: src: Is a directory
============================ grep results ===============================
1 ./tools/config.sub:1396: | -macos* | -mpw* | -magic* | -mmi
xware* | -mon960* | -lnews*)
2 ./tools/config.sub:1399: os=`echo $os | sed -e 's|mac|mac
os|'`
3 ./tools/config.sub:1695: os=-macos
4 ./tools/config.sub:1766: -mpw* | -macos*)
============================ grep results ===============================
Enter a number between 1 and 4 or anything else to quit: 2
Looks great!
In short, libreadline-dev is needed to run rlwrap - although during compilation it is not needed. Not intuitive to me, as I expect libreadline-dev to be used during compilation, instead of containing the shared library that is used during runtime.
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