[Bug debuginfod/30589] New: debuginfod can't find sources even though they exist on disk

["russell at shotover dot com" <sourceware-bugzilla@sourceware.org>]

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=0xaaaaaaaaaabbbbbbbbbbccccccccccdddddddddd
-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
aaaaaaaaaabbbbbbbbbbccccccccccdddddddddd `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/aaaaaaaaaabbbbbbbbbbccccccccccdddddddddd/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=0xaaaaaaaaaabbbbbbbbbbccccccccccdddddddddd
rm ~/.debuginfod.sqlite
DEBUGINFOD_URLS="" debuginfod -F . -vvv
...
rm -rf ~/.cache/debuginfod_client
DEBUGINFOD_URLS="http://localhost:8002" debuginfod-find source
aaaaaaaaaabbbbbbbbbbccccccccccdddddddddd `pwd`/test.c
```

I must have some incorrect assumption about how -F mode finds source
files....it seems like what I'm doing should be supported

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