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* Allow a name to be given to a system configuration through `--name

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NAME'.  E.g., on the losser Subversion server, I do `nix-switch --name 
  svn $(fix ...)' to atomically upgrade the server (the SVN server 
  uses the Apache and Subversion installations in /nix/var/nix/links/svn).
This commit is contained in:
Eelco Dolstra 2003-08-06 14:48:29 +00:00
parent 9ad39df282
commit f8035d06f2
1 changed files with 7 additions and 3 deletions
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10
scripts/nix-switch.in
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@ -4,11 +4,15 @@ use strict;
my $keep = 0;
my $sourceroot = 0;
my $name = "current";
my $srcid;
foreach my $arg (@ARGV) {
my $argnr = 0;
while ($argnr < scalar @ARGV) {
my $arg = $ARGV[$argnr++];
if ($arg eq "--keep") { $keep = 1; }
elsif ($arg eq "--source-root") { $sourceroot = 1; }
elsif ($arg eq "--name") { $name = $ARGV[$argnr++]; }
elsif ($arg =~ /^([0-9a-z]{32})$/) { $srcid = $arg; }
else { die "unknown argument `$arg'" };
}
@ -54,7 +58,7 @@ if ($sourceroot) {
close ID;
}
my $current = "$linkdir/current";
my $current = "$linkdir/$name";
# Read the current generation so that we can delete it (if --keep
# wasn't specified).
@ -70,7 +74,7 @@ my $oldlink = readlink($current);
print "switching $current to $link\n";
my $tmplink = "$linkdir/new_current";
my $tmplink = "$linkdir/.new_$name";
symlink($link, $tmplink) or die "cannot create $tmplink";
rename($tmplink, $current) or die "cannot rename $tmplink";