#pragma once

#include "types.hh"
#include "serialise.hh"


namespace nix {


/* dumpPath creates a Nix archive of the specified path.  The format
   is as follows:

   IF path points to a REGULAR FILE:
     dump(path) = attrs(
       [ ("type", "regular")
       , ("contents", contents(path))
       ])

   IF path points to a DIRECTORY:
     dump(path) = attrs(
       [ ("type", "directory")
       , ("entries", concat(map(f, sort(entries(path)))))
       ])
       where f(fn) = attrs(
         [ ("name", fn)
         , ("file", dump(path + "/" + fn))
         ])

   where:

     attrs(as) = concat(map(attr, as)) + encN(0)
     attrs((a, b)) = encS(a) + encS(b)

     encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary)

     encN(n) = 64-bit little-endian encoding of n.

     contents(path) = the contents of a regular file.

     sort(strings) = lexicographic sort by 8-bit value (strcmp).

     entries(path) = the entries of a directory, without `.' and
     `..'.

     `+' denotes string concatenation. */

struct PathFilter
{
    virtual ~PathFilter() { }
    virtual bool operator () (const Path & path) { return true; }
};

extern PathFilter defaultPathFilter;

void dumpPath(const Path & path, Sink & sink,
    PathFilter & filter = defaultPathFilter);

struct ParseSink
{
    virtual void createDirectory(const Path & path) { };

    virtual void createRegularFile(const Path & path) { };
    virtual void isExecutable() { };
    virtual void preallocateContents(unsigned long long size) { };
    virtual void receiveContents(unsigned char * data, unsigned int len) { };

    virtual void createSymlink(const Path & path, const string & target) { };
};

void parseDump(ParseSink & sink, Source & source);

void restorePath(const Path & path, Source & source);

}
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<div class='path'>path: <a href='/guix/log/?id=9554f5a85e239e5090127d2fa2a07ce10854b83b'>root</a>/<a href='/guix/log/gnu?id=9554f5a85e239e5090127d2fa2a07ce10854b83b'>gnu</a>/<a href='/guix/log/gnu/services?id=9554f5a85e239e5090127d2fa2a07ce10854b83b'>services</a>/<a href='/guix/log/gnu/services/admin.scm?id=9554f5a85e239e5090127d2fa2a07ce10854b83b'>admin.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/admin.scm?id=9554f5a85e239e5090127d2fa2a07ce10854b83b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-06 11:03:39 +0200'>2020-05-06</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=ab034adfe86333fccd6afe476806f169e2074d69'>services: rottlog: Append '.gz' to rotated file.</a><span class='msg-avail'>...</span></td><td>Brice Waegeneire</td></tr>
<tr><td><span title='2019-06-15 18:15:23 +0200'>2019-06-15</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=f3d797005374e5333c7596fe86b4a524ab1b9b11'>services: Remove unneeded imports that led to cycles.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-23 17:57:06 +0100'>2018-12-23</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=83715a7eec81f41a4163a3230d0d8bbbfeb0a5ed'>services: Fix typo in (gnu services admin).</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-10-04 09:32:51 +0200'>2018-10-04</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=89fdd9ee0cc8817283449b33a8c1a2604c575c7e'>services: rottlog: Use command strings in the mcron jobs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-10 12:12:50 +0200'>2018-09-10</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=19de8273eefceac1ba6ddc8d7e374a13f57c678b'>services: tailon: Move to (gnu services web).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-22 11:43:30 +0100'>2018-03-22</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=ca5b73114f13e6f34ded3c415721939c196e07dd'>gnu: shepherd: Update to 0.4.0.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-22 11:43:29 +0100'>2018-03-22</span></td><td><a href='/guix/commit/gnu/services/admin.scm?id=7fe1432a2ec2b8a7dfbfe882044dadadccd2e2c8'>services: rottlog: Add /var/log/debug to '%default-rotations'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>