#define _XOPEN_SOURCE 600

#include "config.h"

#include <cerrno>
#include <algorithm>
#include <vector>
#include <map>

#include <strings.h> // for strcasecmp

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>

#include "archive.hh"
#include "util.hh"


namespace nix {

static string archiveVersion1 = "nix-archive-1";

static string caseHackSuffix = "~nix~case~hack~";

PathFilter defaultPathFilter;


static void dumpContents(const Path & path, size_t size,
    Sink & sink)
{
    writeString("contents", sink);
    writeLongLong(size, sink);

    AutoCloseFD fd = open(path.c_str(), O_RDONLY);
    if (fd == -1) throw SysError(format("opening file `%1%'") % path);

    unsigned char buf[65536];
    size_t left = size;

    while (left > 0) {
        size_t n = left > sizeof(buf) ? sizeof(buf) : left;
        readFull(fd, buf, n);
        left -= n;
        sink(buf, n);
    }

    writePadding(size, sink);
}


static void dump(const Path & path, Sink & sink, PathFilter & filt</td></tr></table>
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<div class='path'>path: <a href='/guix/commit/?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>root</a>/<a href='/guix/commit/gnu?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>gnu</a>/<a href='/guix/commit/gnu/packages?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>packages</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='fda8dd58c2ceb32e96e1ed02630d7edb162a4914'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ricardo Wurmus &lt;rekado@elephly.net&gt;</td><td class='right'>2018-10-30 07:52:38 +0100</td></tr>
<tr><th>committer</th><td>Ricardo Wurmus &lt;rekado@elephly.net&gt;</td><td class='right'>2018-10-30 21:47:06 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/packages?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>fda8dd58c2ceb32e96e1ed02630d7edb162a4914</a> (<a href='/guix/patch/gnu/packages?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/guix/tree/?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>bf958c94c1b2b65ce27f5bc5d2f424ee4de46ca5</a> /<a href='/guix/tree/gnu/packages?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>gnu/packages</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/packages?id=02c57c018a617abd3fcfd83a1a29074048b25dc7'>02c57c018a617abd3fcfd83a1a29074048b25dc7</a> (<a href='/guix/diff/gnu/packages?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914&amp;id2=02c57c018a617abd3fcfd83a1a29074048b25dc7'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/guix/snapshot/guix-fda8dd58c2ceb32e96e1ed02630d7edb162a4914.tar.gz'>guix-fda8dd58c2ceb32e96e1ed02630d7edb162a4914.tar.gz</a><br/><a href='/guix/snapshot/guix-fda8dd58c2ceb32e96e1ed02630d7edb162a4914.zip'>guix-fda8dd58c2ceb32e96e1ed02630d7edb162a4914.zip</a><br/></td></tr></table>
<div class='commit-subject'>gnu: r-shinyace: Update to 0.3.2.</div><div class='commit-msg'>* gnu/packages/cran.scm (r-shinyace): Update to 0.3.2.
</div><div class='diffstat-header'><a href='/guix/diff/?id=fda8dd58c2ceb32e96e1ed02630d7edb162a4914'>Diffstat</a> (limited to 'gnu/packages')</div><table summary='diffstat' class='diffstat'>((char) 0) != string::npos)
                        throw Error(format("NAR contains invalid file name `%1%'") % name);
                    if (name <= prevName)
                        throw Error("NAR directory is not sorted");
                    prevName = name;
                } else if (s == "node") {
                    if (s.empty()) throw badArchive("entry name missing");
                    parse(sink, source, path + "/" + name);
                } else
                    throw badArchive("unknown field " + s);
            }
        }

        else if (s == "target" && type == tpSymlink) {
            string target = readString(source);
            sink.createSymlink(path, target);
        }

        else
            throw badArchive("unknown field " + s);
    }
}


void parseDump(ParseSink & sink, Source & source)
{
    string version;
    try {
        version = readString(source);
    } catch (SerialisationError & e) {
        /* This generally means the integer at the start couldn't be
           decoded.  Ignore and throw the exception below. */
    }
    if (version != archiveVersion1)
        throw badArchive("input doesn't look like a Nix archive");
    parse(sink, source, "");
}


struct RestoreSink : ParseSink
{
    Path dstPath;
    AutoCloseFD fd;

    void createDirectory(const Path & path)
    {
        Path p = dstPath + path;
        if (mkdir(p.c_str(), 0777) == -1)
            throw SysError(format("creating directory `%1%'") % p);
    };

    void createRegularFile(const Path & path)
    {
        Path p = dstPath + path;
        fd.close();
        fd = open(p.c_str(), O_CREAT | O_EXCL | O_WRONLY, 0666);
        if (fd == -1) throw SysError(format("creating file `%1%'") % p);
    }

    void isExecutable()
    {
        struct stat st;
        if (fstat(fd, &st) == -1)
            throw SysError("fstat");
        if (fchmod(fd, st.st_mode | (S_IXUSR | S_IXGRP | S_IXOTH)) == -1)
            throw SysError("fchmod");
    }

    void preallocateContents(unsigned long long len)
    {
#if HAVE_POSIX_FALLOCATE
        if (len) {
            errno = posix_fallocate(fd, 0, len);
            /* Note that EINVAL may indicate that the underlying
               filesystem doesn't support preallocation (e.g. on
               OpenSolaris).  Since preallocation is just an
               optimisation, ignore it. */
            if (errno && errno != EINVAL)
                throw SysError(format("preallocating file of %1% bytes") % len);
        }
#endif
    }

    void receiveContents(unsigned char * data, unsigned int len)
    {
        writeFull(fd, data, len);
    }

    void createSymlink(const Path & path, const string & target)
    {
        Path p = dstPath + path;
        nix::createSymlink(target, p);
    }
};


void restorePath(const Path & path, Source & source)
{
    RestoreSink sink;
    sink.dstPath = path;
    parseDump(sink, source);
}


}