[Bug remote/16622] set sysroot remote: is not enough for set debug-file-directory

["daniel at mariadb dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16622

--- Comment #2 from daniel at mariadb dot org <daniel at mariadb dot org> ---
I hit this also in an attempt to use gdbserver within a container where the
container's debug symbols could be easily installed such that we'd be
testing/debugging in the same environment where the original problem
experienced.

FROM mariadb:10.6
RUN sed -i -e 's/$/ main\/debug/'  /etc/apt/sources.list.d/mariadb.list \
    && apt-get update \
    && apt-get install -y mariadb-server-core-$MARIADB_MAJOR-dbgsym gdbserver \
    && rm -rf /var/lib/apt/lists/*
EXPOSE 2345
USER mysql
CMD ["gdbserver", "localhost:2345", "mysqld"]

After running the container file above:

podman run --cap-add=SYS_PTRACE  --volume mdbdata:/var/lib/mysql  -p 2345:2345 
--name mdb10.6  --rm  mariadb_local:10.6-debug

>From the host:

(gdb) set debug-file-directory target:/usr/lib/debug
(gdb) target remote localhost:2345
Remote debugging using localhost:2345
Reading /usr/sbin/mariadbd from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot" to
access files locally instead.
Reading /usr/sbin/mariadbd from remote target...
Reading symbols from target:/usr/sbin/mariadbd...
Reading /usr/sbin/e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug from remote
target...
Reading /usr/sbin/.debug/e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug from
remote target...
Reading target//usr/sbin/e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug from
remote target...
Reading target/usr/sbin//e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug from
remote target...
Reading target:target/usr/sbin//e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug
from remote target...
Reading /usr/lib/debug//usr/sbin/e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug
from remote target...
Reading /usr/lib/debug/usr/sbin//e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug
from remote target...
Reading
target:/usr/lib/debug/usr/sbin//e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug
from remote target...
Missing separate debuginfo for target:/usr/sbin/mariadbd
Try: dnf --enablerepo='*debug*' install
/usr/lib/debug/.build-id/b9/e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug
...


Container is a ubuntu:focal based so the Fedora gdb path resolution is a bit
mismatched, however if "set debug-file-directory target:/usr/lib/debug" was
processed, then the next manual "symbol
target:/usr/lib/debug/.build-id/b9/e5c6ca8600f8f6ec5fd85ef069200b1cdb3c7d.debug"
to load it won't have been necessary.

While getting the right overlayfs directory would avoid the "target:" need it
quickly falls afoul of selinux and user id mapping complications.

So it would be really nice if target: could actually mean target rather than a
directory in this path, even if it complicates a bit of compatibility.

Thanks for your consideration.

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