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.TH DEBUGINFOD-FIND 1

.SH NAME

debuginfod-find \- request debuginfo-related data

.SH SYNOPSIS

.B debuginfod-find [\fIOPTION\fP]... debuginfo \fIBUILDID\fP

.B debuginfod-find [\fIOPTION\fP]... executable \fIBUILDID\fP

.B debuginfod-find [\fIOPTION\fP]... source \fIBUILDID\fP \fI/FILENAME\fP

.SH DESCRIPTION

\fBdebuginfod-find\fP queries one or more \fBdebuginfod\fP servers for

debuginfo-related data.  In case of a match, it saves the the

requested file into a local cache, prints the file name to standard

output, and exits with a success status of 0.  In case of any error,

it exits with a failure status and an error message to standard error.

.\" Much of the following text is duplicated with debuginfod.8

The debuginfod system uses buildids to identify debuginfo-related data.

These are stored as binary notes in ELF/DWARF files, and are

represented as lowercase hexadecimal.  For example, for a program

/bin/ls, look at the ELF note GNU_BUILD_ID:

.SAMPLE

% readelf -n /bin/ls | grep -A4 build.id

Note section [ 4] '.note.gnu.buildid' of 36 bytes at offset 0x340:

Owner          Data size  Type

GNU                   20  GNU_BUILD_ID

Build ID: 8713b9c3fb8a720137a4a08b325905c7aaf8429d

.ESAMPLE

Then the hexadecimal BUILDID is simply:

.SAMPLE

8713b9c3fb8a720137a4a08b325905c7aaf8429d

.ESAMPLE

.SS debuginfo \fIBUILDID\fP

If the given buildid is known to a server, this request will result

in a binary object that contains the customary \fB.*debug_*\fP

sections.  This may be a split debuginfo file as created by

\fBstrip\fP, or it may be an original unstripped executable.

.SS executable \fIBUILDID\fP

If the given buildid is known to the server, this request will result

in a binary object that contains the normal executable segments.  This

may be a executable stripped by \fBstrip\fP, or it may be an original

unstripped executable.  \fBET_DYN\fP shared libraries are considered

to be a type of executable.

.SS source \fIBUILDID\fP \fI/SOURCE/FILE\fP

If the given buildid is known to the server, this request will result

in a binary object that contains the source file mentioned.  The path

should be absolute.  Relative path names commonly appear in the DWARF

file's source directory, but these paths are relative to

individual compilation unit AT_comp_dir paths, and yet an executable

is made up of multiple CUs.  Therefore, to disambiguate, debuginfod

expects source queries to prefix relative path names with the CU

compilation-directory, followed by a mandatory "/".

Note: the user should not elide \fB../\fP or \fB/./\fP or extraneous

\fB///\fP sorts of path components in the directory names, because if

this is how those names appear in the DWARF files, that is what

debuginfod needs to see too.

For example:

.TS

l l.

#include <stdio.h>	source BUILDID /usr/include/stdio.h

/path/to/foo.c	source BUILDID /path/to/foo.c

\../bar/foo.c AT_comp_dir=/zoo/	source BUILDID /zoo//../bar/foo.c

.TE

.SH "OPTIONS"

.TP

.B "\-v"

Increase verbosity, including printing frequent download-progress messages.

.SH "SECURITY"

debuginfod-find \fBdoes not\fP include any particular security

features.  It trusts that the binaries returned by the debuginfod(s)

are accurate.  Therefore, the list of servers should include only

trustworthy ones.  If accessed across HTTP rather than HTTPS, the

network should be trustworthy.  Authentication information through

the internal \fIlibcurl\fP library is not currently enabled, except

for the basic plaintext \%\fIhttp[s]://userid:password@hostname/\fP style.

(The debuginfod server does not perform authentication, but a front-end

proxy server could.)

.SH "ENVIRONMENT VARIABLES"

.TP 21

.B DEBUGINFOD_URLS

This environment variable contains a list of URL prefixes for trusted

debuginfod instances.  Alternate URL prefixes are separated by space.

.TP 21

.B DEBUGINFOD_TIMEOUT

This environment variable governs the timeout for each debuginfod HTTP

connection.  A server that fails to provide at least 100K of data

within this many seconds is skipped. The default is 90 seconds.  (Zero

or negative means "no timeout".)

.TP 21

.B DEBUGINFOD_CACHE_PATH

This environment variable governs the location of the cache where

downloaded files are kept.  It is cleaned periodically as this program

is reexecuted.  Cache management parameters may be set by files under

this directory: see the \fBdebuginfod_find_debuginfo(3)\fP man page

for details.  The default is $HOME/.debuginfod_client_cache.

.SH "FILES"

.LP

.PD .1v

.TP 20

.B $HOME/.debuginfod_client_cache

Default cache directory.

.PD

.SH "SEE ALSO"

.I "debuginfod(8)"

.I "debuginfod_find_debuginfod(3)"