# DEBUGINFOD-CLIENT-CONFIG(7) - man - phpMan


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## NAME
       debuginfod-client-config  -  debuginfod client environment variables, cache control files and
       etc.


## SYNOPSIS
       Several environment variables and control files control the behaviour  of  debuginfod  client
       applications.




## ENVIRONMENT VARIABLES
### $TMPDIR
              This environment variable points to a file system to be used for temporary files.  The
              default is /tmp.


       **$DEBUGINFOD**___**URLS**
              This environment variable contains a list of URL prefixes for trusted  debuginfod  in‐
              stances.  Alternate URL prefixes are separated by space.  Avoid referential loops that
              cause a server to contact itself, directly or indirectly - the results would be hilar‐
              ious.


       **$DEBUGINFOD**___**CACHE**___**PATH**
              This environment variable governs the location of the cache where downloaded files and
              cache-control files are kept.  The default directory is chosen based on other environ‐
              ment variables, see below.


       **$DEBUGINFOD**___**PROGRESS**
              This  environment  variable  governs  the default progress function.  If set, and if a
              progressfn is not explicitly set, then the  library  will  configure  a  default  pro‐
              gressfn.   This function will append a simple progress message periodically to stderr.
              The default is no progress function output.


       **$DEBUGINFOD**___**VERBOSE**
              This environment variable governs the default file descriptor for verbose output.   If
              set,  and  if a verbose fd is not explicitly set, then the verbose output will be pro‐
              duced on STDERR_FILENO.


       **$DEBUGINFOD**___**RETRY**___**LIMIT**
              This environment variable governs the default limit of  retry  attempts.  If  a  query
              failed with errno other than ENOENT, will initiate several attempts within the limit.


       **$DEBUGINFOD**___**TIMEOUT**
              This  environment variable governs the download _commencing_ 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 time‐
              out".)


       **$DEBUGINFOD**___**MAXTIME**
              This environment variable dictates how long the client will wait to _complete_ the down‐
              load  a  file  found  on a server in seconds. It is best used to ensure that a file is
              downloaded quickly or be rejected. The default is 0 (infinite time).


       **$DEBUGINFOD**___**MAXSIZE**
              This environment variable dictates the maximum size of a file to  download  in  bytes.
              This  is best used if the user would like to ensure only small files are downloaded. A
              value of 0 causes no consideration for size, and the client may attempt to download  a
              file of any size.  The default is 0 (infinite size).


## CACHE
       Before  each  query,  the debuginfod client library checks for a need to clean the cache.  If
       it's time to clean, the library traverses the cache directory and removes  downloaded  debug‐
       info-related artifacts and newly empty directories, if they have not been accessed recently.

       Control  files  are  located directly under the cache directory.  They contain simple decimal
       numbers to set cache-related configuration parameters.  If the files do not exist, the client
       library creates the files with the default parameter values as content.

       After  each  query, the debuginfod client library deposits newly received files into a direc‐
       tory & file that is named based on the build-id.  A failed query is also cached by a  special
       file.  The naming convention used for these artifacts is deliberately **undocumented**.


       **$XDG**___**CACHE**___**HOME/debuginfod**___**client/**
              Default cache directory, if $XDG_CACHE_HOME is set.


       **$HOME/.cache/debuginfod**___**client/**
              Default cache directory, if $XDG_CACHE_HOME is not set.


       **$HOME/.debuginfod**___**client**___**cache/**
              Deprecated cache directory, used only if preexisting.


       **cache**___**clean**___**interval**___**s**
              This  control  file gives the interval between cache cleaning rounds, in seconds.  The
              default is 86400, one day.  0 means "immediately".


       **max**___**unused**___**age**___**s**
              This control file sets how long unaccessed debuginfo-related files  are  retained,  in
              seconds.  The default is 604800, one week.  0 means "immediately".


       **cache**___**miss**___**s**
              This  control file sets how long to remember a query failure, in seconds.  New queries
              for the same artifacts within this time window are short-circuited (returning an imme‐
              diate  failure  instead  of sending a new query to servers).  This accelerates queries
              that probably would still fail.  The default is 600, 10 minutes.  0 means "forget  im‐
              mediately".



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