uscan [options] [path-to-debian-source-packages ...]

       uscan scans the given directories (or the current directory if none are
       specified) and all of their subdirectories for  packages  containing  a
       control file debian/watch.  Parameters are then read from those control
       files and upstream ftp or http sites are inspected for newly  available
       updates  (as  compared  with the upstream version number retrieved from
       the debian/changelog file in the same directory).  The  newest  updates
       are retrieved (as determined by their version numbers) and if specified
       in the watch file, a program may then be executed on  the  newly  down-
       loaded source.

       The  traditional  debian/watch files can still be used, but the current
       format offers both simpler and  more  flexible  services.   We  do  not
       describe  the  old format here; for their documentation, see the source
       code for uscan.

FORMAT of debian/watch files
       The following demonstrates the type of entries which can  appear  in  a
       debian/watch  file.   Obviously,  not  all of these would appear in one
       such file; usually, one would have one line for the current package.

       # format version number, currently 3; this line is compulsory!

       # Line continuations are performed with \

       # This is the format for an FTP site:
       # Full-site-with-pattern  [Version  [Action]]\.tar\.gz \
         debian  uupdate

       # This is the format for an FTP site with regex special characters in
       # the filename part\+\+-(.+)\.tar\.gz

       # This is the format for an FTP site with directory pattern matching[\d\.]+)/src/nessus-core-([\d\.]+)\.tar\.gz

       # This can be used if you want to override the PASV setting
       # for a specific site
       # opts=pasv ftp://.../...

       # This is one format for an HTTP site, which is the same
       # as the FTP format.  uscan starts by downloading the homepage,
       # obtained by removing the last component of the URL; in this case,

       # runs a redirector which allows a simpler form of URL
       # for SourceForge based projects. The format below will automatically
       # be rewritten to use the redirector.\.tar\.gz

       # is a redirector for GitHub projects
       # It can be used as following:<user>/<project> (.+).tar.gz

       # This is the format for a site which has funny version numbers;
       # the parenthesised groups will be joined with dots to make a
       # sanitised version number\d+)_(\d+)\.tar\.gz

       # This is another way of handling site with funny version numbers,
       # this time using mangling.  (Note that multiple groups will be
       # concatenated before mangling is performed, and that mangling will
       # only be performed on the basename version number, not any path
       # version numbers.)
       opts="uversionmangle=s/^/0.0./" \\.tar\.gz

       # Similarly, the upstream part of the Debian version number can be
       # mangled:
       opts=dversionmangle=s/\.dfsg\.\d+$// \\.tar\.gz

       # The filename is found by taking the last component of the URL and
       # removing everything after any '?'.  If this would not make a usable
       # filename, use filenamemangle.  For example,
       # <A href="">
       # could be handled as:
       # opts=filenamemangle=s/.*=(.*)/$1/ \
       # <A href="">
       # could be handled as:
       # opts=filenamemangle=s/.*=(.*)/foo-$1\.tar\.gz/ \

       # The option downloadurlmangle can be used to mangle the URL of the file
       # to download.  This can only be used with http:// URLs.  This may be
       # necessary if the link given on the web page needs to be transformed in
       # some way into one which will work automatically, for example:
       # opts=downloadurlmangle=s/prdownload/download/ \
       # \

       Comment lines may be introduced with  a  `#'  character.   Continuation
       lines  may  be indicated by terminating a line with a backslash charac-

       basename (everything after the trailing `/').  In the case of  an  HTTP
       site, the URL obtained by stripping everything after the trailing slash
       will be downloaded and  searched  for  hrefs  (links  of  the  form  <a
       href=...>)  to  either  the  full URL pattern given, or to the absolute
       part (everything without the part), or to  the  base-
       name  (just  the part after the final `/').  Everything up to the final
       slash is taken as a verbatim URL, as long as there are  no  parentheses
       (`('  and  ')') in this part of the URL: if it does, the directory name
       will be matched in the same way as the final component of  the  URL  as
       described  below.   (Note  that  regex  metacharacters  such as `+' are
       regarded literally unless they  are  in  a  path  component  containing
       parentheses;  see  the  Atlas-C++ example above.  Also, the parentheses
       must match within each path component.)

       The pattern (after the final slash) is a Perl regexp (see perlre(1) for
       details  of  these).   You  need  to  make the pattern so tight that it
       matches only the upstream software you are interested  in  and  nothing
       else.   Also,  the pattern will be anchored at the beginning and at the
       end, so it must match the full filename.  (Note that for HTTP URLs, the
       href  may  include the absolute path or full site and path and still be
       accepted.)  The pattern  must  contain  at  least  one  Perl  group  as
       explained in the next paragraph.

       Having  got  a list of `files' matching the pattern, their version num-
       bers are extracted by  treating  the  part  matching  the  Perl  regexp
       groups,  demarcated  by  `(...)', joining them with `.' as a separator,
       and using the result as the version number of the  file.   The  version
       number  will  then  be mangled if required by the uversionmangle option
       described below.  Finally, the file versions are then compared to  find
       the  one with the greatest version number, as determined by dpkg --com-
       pare-versions.  Note that if you need Perl groups which are not  to  be
       used  in  the version number, either use `(?:...)' or use the uversion-
       mangle option to clean up the mess!

       The current (upstream) version can be specified as the second parameter
       in  the watch file line.  If this is debian or absent, then the current
       Debian version (as determined by debian/changelog) is used to determine
       the current upstream version.  The current upstream version may also be
       specified by the command-line option --upstream-version,  which  speci-
       fies  the  upstream  version  number of the currently installed package
       (i.e., the Debian version number without epoch  and  Debian  revision).
       The upstream version number will then be mangled using the dversionman-
       gle option if one is specified, as described below.  If the newest ver-
       sion available is newer than the current version, then it is downloaded
       into the parent  directory,  unless  the  --report  or  --report-status
       option  has  been used.  Once the file has been downloaded, then a sym-
       link    to    the     file     is     made     from     <package>_<ver-
       sion>.orig.tar.{gz|bz2|lzma|xz} as described by the help for the --sym-
       link option.

       Finally, if a third parameter (an action) is given in  the  watch  file
       line, this is taken as the name of a command, and the command
           command --upstream-version version filename
       is  executed,  using  either  the original file or the symlink name.  A
       of the href, you can use a pattern like ".*/name-(.+)\.tar\.gz" if  you
       know    that    there    is    a    full    URL,   or   better   still:
       "(?:.*/)?name-(.+)\.tar\.gz" if there may or may not be.  Note the  use
       of  (?:...)  to  avoid making a backreference.)  If any of the hrefs in
       the homepage which match the (anchored) pattern are relative URLs, they
       will  be taken as being relative to the base URL of the homepage (i.e.,
       with everything after the trailing slash removed), or relative  to  the
       base URL specified in the homepage itself with a <base href="..."> tag.
       The third and fourth fields are the version number and action fields as

       A watch file line may be prefixed with `opts=options', where options is
       a comma-separated list of options.  The whole  options  string  may  be
       enclosed  in  double quotes, which is necessary if options contains any
       spaces.  The recognised options are as follows:

       active and passive (or pasv)
              If used on an FTP line, these override the choice of whether  to
              use  PASV  mode  or not, and force the use of the specified mode
              for this site.

              This is used to mangle the upstream version number as matched by
              the  ftp://...  or  http://  rules as follows.  First, the rules
              string is split into multiple rules  at  every  `;'.   Then  the
              upstream  version number is mangled by applying rule to the ver-
              sion, in a similar way to executing the Perl command:
                  $version =~ rule;
              for each rule.  Thus,  suitable  rules  might  be  `s/^/0./'  to
              prepend  `0.'  to  the  version  number  and `s/_/./g' to change
              underscores into periods.  Note that the rules  string  may  not
              contain commas; this should not be a problem.

              rule  may  only  use the 's', 'tr' and 'y' operations.  When the
              's' operation is used, only the  'g',  'i'  and  'x'  flags  are
              available  and  rule  may not contain any expressions which have
              the potential to execute code (i.e. the (?{})  and  (??{})  con-
              structs are not supported).

              If  the 's' operation is used, the replacement can contain back-
              references to expressions within  parenthesis  in  the  matching
              regexp,  like  `s/-alpha(\d*)/.a$1/'.  These backreferences must
              use the `$1' syntax, as the `\1' syntax is not supported.

              This is used to mangle the Debian version  number  of  the  cur-
              rently  installed  package in the same way as the uversionmangle
              option.  Thus, a suitable rule might  be  `s/\.dfsg\.\d+$//'  to
              remove  a `.dfsg.1' suffix from the Debian version number, or to
              handle `.pre6' type version numbers.  Again,  the  rules  string
              may not contain commas; this should not be a problem.

              URL  is  first computed based on the homepage downloaded and the
              pattern matched, then the version number is determined from this
              URL.  Finally, any rules given by this option are applied before
              the actual download attempt is made. An example of  its  use  is
              given in the examples section above.

Directory name checking
       Similarly  to  several  other  scripts in the devscripts package, uscan
       explores the requested directory trees looking for debian/changelog and
       debian/watch  files.  As a safeguard against stray files causing poten-
       tial problems, and in order to promote efficiency, it will examine  the
       name  of  the parent directory once it finds the debian/changelog file,
       and check that the directory name corresponds to the package name.   It
       will  only  attempt  to download newer versions of the package and then
       perform any requested action if the directory name matches the  package
       name.   Precisely  how  it does this is controlled by two configuration
       file        variables        DEVSCRIPTS_CHECK_DIRNAME_LEVEL         and
       DEVSCRIPTS_CHECK_DIRNAME_REGEX,  and  their  corresponding command-line
       options --check-dirname-level and --check-dirname-regex.

       DEVSCRIPTS_CHECK_DIRNAME_LEVEL can take the following values:

       0      Never check the directory name.

       1      Only check the directory name if we have had to change directory
              in  our search for debian/changelog, that is, the directory con-
              taining debian/changelog is not the directory from  which  uscan
              was invoked.  This is the default behaviour.

       2      Always check the directory name.

       The  directory name is checked by testing whether the current directory
       name (as determined by pwd(1)) matches the regex given by the  configu-
       ration  file  option  DEVSCRIPTS_CHECK_DIRNAME_REGEX  or by the command
       line option --check-dirname-regex regex.  Here regex is  a  Perl  regex
       (see  perlre(3perl)),  which  will be anchored at the beginning and the
       end.  If regex contains a '/', then it must match  the  full  directory
       path.   If  not,  then it must match the full directory name.  If regex
       contains the string 'PACKAGE', this will  be  replaced  by  the  source
       package  name, as determined from the changelog.  The default value for
       the regex is: 'PACKAGE(-.+)?', thus matching directory  names  such  as
       PACKAGE and PACKAGE-version.

       This script will perform a fully automatic upstream update.

       #!/bin/sh -e
       # called with '--upstream-version' <version> <file>
       uupdate "$@"
       package=`dpkg-parsechangelog | sed -n 's/^Source: //p'`
       cd ../$package-$2

       Note  that  we  don't  call dupload or dput automatically, as the main-
              Report and download.  (This is the default behaviour.)

              Path of directory to which to download.

              Download  upstream  even if up to date (will not overwrite local
              files, however)

       --pasv Force PASV mode for FTP connections.

              Do not use PASV mode for FTP connections.

       --timeout N
              Set timeout to N seconds (default 20 seconds).

              Make orig.tar.gz symlinks  to  any  downloaded  files  if  their
              extensions  are  .tar.gz  or  .tgz.   This  is  also handled for
              orig.tar.bz2  (for  upstream   .tar.bz2,   .tbz,   and   .tbz2),
              orig.tar.lzma (for upstream .tar.lzma, .tlz, .tlzm, and .tlzma),
              and orig.tar.xz (for upstream .tar.xz and .txz).  (This  is  the
              default behaviour.)

              Instead  of  symlinking,  rename  the  downloaded files to their
              Debian orig.tar.gz, orig.tar.bz2, orig.tar.lzma, or  orig.tar.xz
              names as described above.

              After having downloaded an lzma tar, xz tar, bzip tar or zip ar-
              chive, repack it to a gzip tar archive, which is still currently
              required as a member of a Debian source package. Does nothing if
              the downloaded archive is not an lzma tar archive,  xz  tar  ar-
              chive,  bzip tar archive or a zip archive (i.e. it doesn't match
              a .tlz, .tlzm, .tlzma, .tar.lzma, .txz,  .tar.xz,  .tbz,  .tbz2,
              .tar.bz2 or .zip extension). The unzip package must be installed
              in order to repack .zip archives, the xz-utils package  must  be
              installed to repack lzma or xz tar archives.

              Don't make these symlinks and don't rename the files.

       --dehs Use an XML format for output, as required by the DEHS system.

              Use  the  traditional uscan output format.  (This is the default

       --package package
              Specify the name of the package to check for rather than examin-
              ing   debian/changelog;  this  requires  the  --upstream-version
              Specify the watchfile rather than perform a  directory  scan  to
              determine  it.   If  this option is used without --package, then
              uscan must be called from within the Debian package source  tree
              (so  that  debian/changelog  can  be found simply by stepping up
              through the tree).

       --download-version version
              Specify the version which the upstream  release  must  match  in
              order  to  be considered, rather than using the release with the
              highest version.

              Download the currently packaged version

              Give verbose output.

              Don't give verbose output.  (This is the default behaviour.)

              Dump the downloaded web pages to stdout for debugging your watch

       --check-dirname-level N
              See the above section Directory name checking for an explanation
              of this option.

       --check-dirname-regex regex
              See the above section Directory name checking for an explanation
              of this option.

       --user-agent, --useragent
              Override the default user agent header.

       --no-conf, --noconf
              Do  not  read any configuration files.  This can only be used as
              the first option given on the command-line.

       --help Give brief usage information.

              Display version information.

       The two configuration files /etc/devscripts.conf and ~/.devscripts  are
       sourced by a shell in that order to set configuration variables.  These
       may be overridden by command line options.  Environment  variable  set-
       tings  are  ignored for this purpose.  If the first command line option
       given is --noconf, then these files will not be  read.   The  currently
       recognised variables are:

              If  this  is  set  to  no, then newer upstream files will not be

              If     this     is     set    to    no,    then    a    pkg_ver-
              sion.orig.tar.{gz|bz2|lzma|xz} symlink will not be made (equiva-
              lent  to  the --no-symlink option).  If it is set to yes or sym-
              link, then the symlinks will be made.  If it is set  to  rename,
              then the files are renamed (equivalent to the --rename option).

              If  this  is  set  to  yes, then DEHS-style output will be used.
              This is equivalent to the --dehs option.

              If this is set to yes, then verbose output will be given.   This
              is equivalent to the --verbose option.

              If set, the specified user agent string will be used in place of
              the default.  This is equivalent to the --user-agent option.

              If set, the downloaded files will be placed in  this  directory.
              This is equivalent to the --destdir option.

              If  this is set to yes, then after having downloaded a bzip tar,
              lzma tar, xz tar, or zip archive, uscan will repack it to a gzip
              tar.  This is equivalent to the --repack option.

       The  exit  status  gives some indication of whether a newer version was
       found or not; one is advised to read the output  to  determine  exactly
       what happened and whether there were any warnings to be noted.

       0      Either  --help  or  --version  was  used, or for some watch file
              which was examined, a newer upstream version was located.

       1      No newer upstream versions were located for  any  of  the  watch
              files examined.

       This  section  briefly  describes the backwards-incompatible watch file
       features which have been added in each  watch  file  version,  and  the
       first version of the devscripts package which understood them.

       Pre-version 2
              The watch file syntax was significantly different in those days.
              Don't use it.  If you are upgrading from a pre-version  2  watch
              file,  you  are  advised  to read this manpage and to start from

       Version 2
              devscripts version 2.6.90: The first incarnation of the  current
              style of watch files.
              number groups to be (?:...) instead of a plain (...) group.

       dpkg(1), perlre(1), uupdate(1) and devscripts.conf(5).

       The  original version of uscan was written by Christoph Lameter <clame->.  Significant improvements, changes and  bugfixes  were
       made  by  Julian  Gilbey  <>.   HTTP support was added by
       Piotr Roszatycki <>.  The  program  was  rewritten  in
       Perl by Julian Gilbey.

DEBIAN                         Debian Utilities                       USCAN(1)
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