[Bug debuginfod/30589] New: debuginfod can't find sources even though they exist on disk
https://sourceware.org/bugzilla/show_bug.cgi?id=30589
Bug ID: 30589
Summary: debuginfod can't find sources even though they exist
on disk
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: enhancement
Priority: P2
Component: debuginfod
Assignee: unassigned at sourceware dot org
Reporter: russell at shotover dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
I'm trying to create a debuginfod server for our internal codebase, and would
like it to be able to serve correct sources, even for arbitrary old versions of
our software. We package as .deb, but the docs are pretty clear that that
doesn't support serving sources. So, I'm passing -ffile-prefix-map to where I
will eventually copy the sources, but debuginfod doesn't seem to want anything
to do with it:
```
echo 'int main() {}' > test.c
gcc -g -O0 test.c -Wl,--build-id=0xaabbccdd
-ffile-prefix-map=`pwd`=`pwd`/servefrom
mkdir servefrom
mv test.c a.out servefrom
rm ~/.debuginfod.sqlite
DEBUGINFOD_URLS="" debuginfod -F . -vvv
...
rm -rf ~/.cache/debuginfod_client
DEBUGINFOD_URLS="http://localhost:8002"; debuginfod-find source
aabbccdd `pwd`/test.c
```
fails. Fetching the executable or debuginfo succeeds.
The debuginfod log shows:
```
[Tue 27 Jun 2023 12:13:24 AM GMT] (496432/496443): 127.0.0.1:49688
UA:elfutils/0.189,Linux/x86_64,arch/ XFF: GET
/buildid/aabbccdd/source/tmp/asdf/servefrom/test.c
404 9 0+0ms
```
However, the same thing without the map works:
```
echo 'int main() {}' > test.c
gcc -g -O0 test.c -Wl,--build-id=0xaabbccdd
rm ~/.debuginfod.sqlite
DEBUGINFOD_URLS="" debuginfod -F . -vvv
...
rm -rf ~/.cache/debuginfod_client
DEBUGINFOD_URLS="http://localhost:8002"; debuginfod-find source
aabbccdd `pwd`/test.c
```
I must have some incorrect assumption about how -F mode finds source
filesit seems like what I'm doing should be supported
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[Bug debuginfod/30589] debuginfod can't find sources even though they exist on disk
https://sourceware.org/bugzilla/show_bug.cgi?id=30589 --- Comment #1 from Russell Greene --- er, the correct command for the non-working case should be DEBUGINFOD_URLS="http://localhost:8002"; debuginfod-find source aabbccdd `pwd`/servefrom/test.c -- You are receiving this mail because: You are on the CC list for the bug.
[Bug debuginfod/30589] debuginfod can't find sources even though they exist on disk
https://sourceware.org/bugzilla/show_bug.cgi?id=30589 --- Comment #3 from Russell Greene --- Yeah, that looks like an issue for sure. Clang seems to omit more sane dwarf: Directory table: [path(line_strp)] 0 /home/russell/debuginfod_test/servefrom (0) But debuginfod still doesn't seem to like it. Interestingly, the actual deployment didn't use a subpath, so I need to see what's exactly going wrong with it--this issue here may actually be unrelated to what I'm running into. -- You are receiving this mail because: You are on the CC list for the bug.
[Bug debuginfod/30589] debuginfod can't find sources even though they exist on disk
https://sourceware.org/bugzilla/show_bug.cgi?id=30589
--- Comment #4 from Russell Greene ---
% mkdir servefrom
% echo 'int main(){}' > test.c
% gcc -g test.c -ffile-prefix-map=`pwd`=`pwd`/servefrom -o test_gcc
% clang -g test.c -ffile-prefix-map=`pwd`=`pwd`/servefrom -o test_clang
% mv test.c servefrom
% gdb test_gcc -ex 'break main' -ex run -ex quit od
1 int main() {}
% gdb test_clang -ex 'break main' -ex run -ex quit od
1 int main() {}
% lldb test_gcc -o 'b main' -o 'run' -o 'quit'
( no source)
% lldb test_clang -o 'b main' -o 'run' -o 'quit'
-> 1int main(){}
LLDB is not thrilled with whatever gcc is emitting here either. Maybe a GCC
bug? Think they would want this reported?
Regardless, this bug is pretty minor as mapping to a subdirectory seems to me a
pretty rare thing. I'll open a different bug report if I'm able to track the
bug I'm running into on (if it's not just a misconfiguration).
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