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* Implemented Eelco V.'s `nix-env -I' command to specify the default

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path of the Nix expression to be used with the import, upgrade, and
  query commands.  For instance,

  $ nix-env -I ~/nixpkgs/pkgs/system/i686-linux.nix

  $ nix-env --query --available   [aka -qa]
  sylpheed-0.9.7
  bison-1.875
  pango-1.2.5
  subversion-0.35.1
  ...

  $ nix-env -i sylpheed

  $ nix-env -u subversion

  There can be only one default at a time.

* If the path to a Nix expression is a symlink, follow the symlink
  prior to resolving relative path references in the expression.
This commit is contained in:
Eelco Dolstra 2004-01-05 16:26:43 +00:00
parent f83c5e3e5f
commit 4a373a3e9a
7 changed files with 87 additions and 43 deletions
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5
src/libutil/archive.cc
View file

@ -122,11 +122,8 @@ static void dump(const Path & path, DumpSink & sink)
else if (S_ISLNK(st.st_mode)) {
writeString("type", sink);
writeString("symlink", sink);
char buf[st.st_size];
if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
throw SysError("reading symbolic link " + path);
writeString("target", sink);
writeString(string(buf, st.st_size), sink);
writeString(readLink(path), sink);
}
else throw Error("unknown file type: " + path);

14
src/libutil/util.cc
View file

@ -109,6 +109,20 @@ bool pathExists(const Path & path)
}
Path readLink(const Path & path)
{
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting status of `%1%'") % path);
if (!S_ISLNK(st.st_mode))
throw Error(format("`%1%' is not a symlink") % path);
char buf[st.st_size];
if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
throw SysError(format("reading symbolic link `%1%'") % path);
return string(buf, st.st_size);
}
Strings readDirectory(const Path & path)
{
Strings names;

4
src/libutil/util.hh
View file

@ -73,6 +73,10 @@ string baseNameOf(const Path & path);
/* Return true iff the given path exists. */
bool pathExists(const Path & path);
/* Read the contents (target) of a symbolic link. The result is not
in any way canonicalised. */
Path readLink(const Path & path);
/* Read the contents of a directory. The entries `.' and `..' are
removed. */
Strings readDirectory(const Path & path);