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* Upgrade operation in `nix-env'. For instance, you can say 

nix-env -u foo.nix strategoxt

  to replace the installed `strategoxt' derivation with the one from `foo.nix', if 
  the latter has a higher version number.  This is a no-op if `strategoxt' is not 
  installed.  Wildcards are also accepted, so

    nix-env -u foo.nix '*'

  will replace any installed derivation with newer versions from `foo.nix', if 
  available.

  The notion of "version number" is somewhat ad hoc, but should be useful in most 
  cases, as evidenced by the following unit tests for the version comparator:

    TEST("1.0", "2.3", -1);
    TEST("2.1", "2.3", -1);
    TEST("2.3", "2.3", 0);
    TEST("2.5", "2.3", 1);
    TEST("3.1", "2.3", 1);
    TEST("2.3.1", "2.3", 1);
    TEST("2.3.1", "2.3a", 1);
    TEST("2.3pre1", "2.3", -1);
    TEST("2.3pre3", "2.3pre12", -1);
    TEST("2.3a", "2.3c", -1);
    TEST("2.3pre1", "2.3c", -1);
    TEST("2.3pre1", "2.3q", -1);

  (-1 = less, 0 = equal, 1 = greater)

* A new verbosity level `lvlInfo', between `lvlError' and `lvlTalkative'.  This is 
  the default for `nix-env', so without any `-v' flags users should get useful 
  output, e.g.,

$ nix-env -u foo.nix strategoxt
upgrading `strategoxt-0.9.2' to `strategoxt-0.9.3'
This commit is contained in:
Eelco Dolstra 2003-12-22 16:04:00 +00:00
parent f3c9783846
commit cf0287c09e
2 changed files with 168 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/libutil/util.hh
View File

@ -96,7 +96,8 @@ void writeStringToFile(const Path & path, const string & s);
/* Messages. */
typedef enum {
lvlError,
lvlError,
lvlInfo,
lvlTalkative,
lvlChatty,
lvlDebug,

192
src/nix-env/main.cc
View File

@ -230,15 +230,13 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs,
}
class DrvName
struct DrvName
{
string fullName;
string name;
string version;
unsigned int hits;
public:
/* Parse a derivation name. The `name' part of a derivation name
is everything up to but not including the first dash *not*
followed by a letter. The `version' part is the rest
@ -248,6 +246,7 @@ public:
{
name = fullName = s;
for (unsigned int i = 0; i < s.size(); ++i) {
/* !!! isalpha/isdigit are affected by the locale. */
if (s[i] == '-' && i + 1 < s.size() && !isalpha(s[i + 1])) {
name = string(s, 0, i);
version = string(s, i + 1);
@ -262,24 +261,92 @@ public:
if (version != "" && version != n.version) return false;
return true;
}
void hit()
{
hits++;
}
unsigned int getHits()
{
return hits;
}
string getFullName()
{
return fullName;
}
};
string nextComponent(string::const_iterator & p,
const string::const_iterator end)
{
/* Skip any dots and dashes (component separators). */
while (p != end && (*p == '.' || *p == '-')) ++p;
if (p == end) return "";
/* If the first character is a digit, consume the longest sequence
of digits. Otherwise, consume the longest sequence of
non-digit, non-separator characters. */
string s;
if (isdigit(*p))
while (p != end && isdigit(*p)) s += *p++;
else
while (p != end && (!isdigit(*p) && *p != '.' && *p != '-'))
s += *p++;
return s;
}
#include <fstream>
bool parseInt(const string & s, int & n)
{
istringstream st(s);
st >> n;
return !st.fail();
}
static bool componentsLT(const string & c1, const string & c2)
{
int n1, n2;
bool c1Num = parseInt(c1, n1), c2Num = parseInt(c2, n2);
if (c1Num && c2Num) return n1 < n2;
else if (c1 == "" && c2Num) return true;
else if (c1 == "pre" && c2 != "pre") return true;
else if (c2 == "pre") return false;
/* Assume that `2.3a' < `2.3.1'. */
else if (c2Num) return true;
else if (c1Num) return false;
else return c1 < c2;
}
static int compareVersions(const string & v1, const string & v2)
{
string::const_iterator p1 = v1.begin();
string::const_iterator p2 = v2.begin();
while (p1 != v1.end() || p2 != v2.end()) {
string c1 = nextComponent(p1, v1.end());
string c2 = nextComponent(p2, v2.end());
if (componentsLT(c1, c2)) return -1;
else if (componentsLT(c2, c1)) return 1;
}
return 0;
}
static void testCompareVersions()
{
#define TEST(v1, v2, n) assert( \
compareVersions(v1, v2) == n && compareVersions(v2, v1) == -n)
TEST("1.0", "2.3", -1);
TEST("2.1", "2.3", -1);
TEST("2.3", "2.3", 0);
TEST("2.5", "2.3", 1);
TEST("3.1", "2.3", 1);
TEST("2.3.1", "2.3", 1);
TEST("2.3.1", "2.3a", 1);
TEST("2.3pre1", "2.3", -1);
TEST("2.3pre3", "2.3pre12", -1);
TEST("2.3a", "2.3c", -1);
TEST("2.3pre1", "2.3c", -1);
TEST("2.3pre1", "2.3q", -1);
}
typedef list<DrvName> DrvNames;
@ -293,7 +360,7 @@ static DrvNames drvNamesFromArgs(const Strings & opArgs)
}
void installDerivations(EvalState & state,
static void installDerivations(EvalState & state,
Path nePath, DrvNames & selectors, const Path & linkPath)
{
debug(format("installing derivations from `%1%'") % nePath);
@ -312,7 +379,9 @@ void installDerivations(EvalState & state,
j != selectors.end(); ++j)
{
if (j->matches(drvName)) {
j->hit();
printMsg(lvlInfo,
format("installing `%1%'") % i->second.name);
j->hits++;
selectedDrvs.insert(*i);
}
}
@ -321,9 +390,9 @@ void installDerivations(EvalState & state,
/* Check that all selectors have been used. */
for (DrvNames::iterator i = selectors.begin();
i != selectors.end(); ++i)
if (i->getHits() == 0)
if (i->hits == 0)
throw Error(format("selector `%1%' matches no derivations")
% i->getFullName());
% i->fullName);
/* Add in the already installed derivations. */
DrvInfos installedDrvs;
@ -349,6 +418,69 @@ static void opInstall(Globals & globals,
}
static void upgradeDerivations(EvalState & state,
Path nePath, DrvNames & selectors, const Path & linkPath)
{
debug(format("upgrading derivations from `%1%'") % nePath);
/* Upgrade works as follows: we take all currently installed
derivations, and for any derivation matching any selector, look
for a derivation in the input Nix expression that has the same
name and a higher version number. */
/* Load the currently installed derivations. */
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs, linkPath);
/* Fetch all derivations from the input file. */
DrvInfos availDrvs;
loadDerivations(state, nePath, availDrvs);
/* Go through all installed derivations. */
for (DrvInfos::iterator i = installedDrvs.begin();
i != installedDrvs.end(); ++i)
{
DrvName drvName(i->second.name);
/* Do we want to upgrade this derivation? */
bool upgrade = false;
for (DrvNames::iterator j = selectors.begin();
j != selectors.end(); ++j)
{
if (j->matches(drvName)) {
j->hits++;
upgrade = true;
break;
}
}
if (!upgrade) continue;
/* If yes, find the derivation in the input Nix expression
with the same name and the highest version number. */
DrvInfos::iterator bestDrv = i;
DrvName bestName = drvName;
for (DrvInfos::iterator j = availDrvs.begin();
j != availDrvs.end(); ++j)
{
DrvName newName(j->second.name);
if (newName.name == bestName.name &&
compareVersions(newName.version, bestName.version) > 0)
bestDrv = j;
}
if (bestDrv != i) {
printMsg(lvlInfo,
format("upgrading `%1%' to `%2%'")
% i->second.name % bestDrv->second.name);
installedDrvs.erase(i);
installedDrvs.insert(*bestDrv);
}
}
createUserEnv(state, installedDrvs, linkPath);
}
static void opUpgrade(Globals & globals,
Strings opFlags, Strings opArgs)
{
@ -357,12 +489,14 @@ static void opUpgrade(Globals & globals,
if (opArgs.size() < 1) throw UsageError("Nix file expected");
Path nePath = opArgs.front();
opArgs.pop_front();
DrvNames drvNames = drvNamesFromArgs(
Strings(++opArgs.begin(), opArgs.end()));
upgradeDerivations(globals.state, nePath, drvNames, globals.linkPath);
}
void uninstallDerivations(EvalState & state, DrvNames & selectors,
static void uninstallDerivations(EvalState & state, DrvNames & selectors,
Path & linkPath)
{
DrvInfos installedDrvs;
@ -374,8 +508,11 @@ void uninstallDerivations(EvalState & state, DrvNames & selectors,
DrvName drvName(i->second.name);
for (DrvNames::iterator j = selectors.begin();
j != selectors.end(); ++j)
if (j->matches(drvName))
if (j->matches(drvName)) {
printMsg(lvlInfo,
format("uninstalling `%1%'") % i->second.name);
installedDrvs.erase(i);
}
}
createUserEnv(state, installedDrvs, linkPath);
@ -466,6 +603,9 @@ static void opQuery(Globals & globals,
void run(Strings args)
{
/* Use a higher default verbosity (lvlInfo). */
verbosity = (Verbosity) ((int) verbosity + 1);
Strings opFlags, opArgs;
Operation op = 0;