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Merge pull request #8137 from edolstra/lazy-trees-cherrypicks

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Add CanonPath::makeRelative()
This commit is contained in:
Eelco Dolstra 2023-03-31 18:26:08 +02:00 committed by GitHub
parent 1829e7ccac 936e7c66eb
commit cf76b38e27
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 72 additions and 32 deletions
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26
src/libutil/canon-path.cc
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@ -100,4 +100,30 @@ std::ostream & operator << (std::ostream & stream, const CanonPath & path)
return stream; return stream;
} }
std::string CanonPath::makeRelative(const CanonPath & path) const
{
auto p1 = begin();
auto p2 = path.begin();
for (; p1 != end() && p2 != path.end() && *p1 == *p2; ++p1, ++p2) ;
if (p1 == end() && p2 == path.end())
return ".";
else if (p1 == end())
return std::string(p2.remaining);
else {
std::string res;
while (p1 != end()) {
++p1;
if (!res.empty()) res += '/';
res += "..";
}
if (p2 != path.end()) {
if (!res.empty()) res += '/';
res += p2.remaining;
}
return res;
}
}
} }

7
src/libutil/canon-path.hh
View file

@ -85,6 +85,9 @@ public:
bool operator != (const Iterator & x) const bool operator != (const Iterator & x) const
{ return remaining.data() != x.remaining.data(); } { return remaining.data() != x.remaining.data(); }
bool operator == (const Iterator & x) const
{ return !(*this != x); }
const std::string_view operator * () const const std::string_view operator * () const
{ return remaining.substr(0, slash); } { return remaining.substr(0, slash); }
@ -166,6 +169,10 @@ public:
the `allowed` paths are within `this`. (The latter condition the `allowed` paths are within `this`. (The latter condition
ensures access to the parents of allowed paths.) */ ensures access to the parents of allowed paths.) */
bool isAllowed(const std::set<CanonPath> & allowed) const; bool isAllowed(const std::set<CanonPath> & allowed) const;
/* Return a representation `x` of `path` relative to `this`, i.e.
`CanonPath(this.makeRelative(x), this) == path`. */
std::string makeRelative(const CanonPath & path) const;
}; };
std::ostream & operator << (std::ostream & stream, const CanonPath & path); std::ostream & operator << (std::ostream & stream, const CanonPath & path);

71
src/libutil/tests/canon-path.cc
View file

@ -107,15 +107,13 @@ namespace nix {
} }
TEST(CanonPath, within) { TEST(CanonPath, within) {
{ ASSERT_TRUE(CanonPath("foo").isWithin(CanonPath("foo")));
ASSERT_TRUE(CanonPath("foo").isWithin(CanonPath("foo"))); ASSERT_FALSE(CanonPath("foo").isWithin(CanonPath("bar")));
ASSERT_FALSE(CanonPath("foo").isWithin(CanonPath("bar"))); ASSERT_FALSE(CanonPath("foo").isWithin(CanonPath("fo")));
ASSERT_FALSE(CanonPath("foo").isWithin(CanonPath("fo"))); ASSERT_TRUE(CanonPath("foo/bar").isWithin(CanonPath("foo")));
ASSERT_TRUE(CanonPath("foo/bar").isWithin(CanonPath("foo"))); ASSERT_FALSE(CanonPath("foo").isWithin(CanonPath("foo/bar")));
ASSERT_FALSE(CanonPath("foo").isWithin(CanonPath("foo/bar"))); ASSERT_TRUE(CanonPath("/foo/bar/default.nix").isWithin(CanonPath("/")));
ASSERT_TRUE(CanonPath("/foo/bar/default.nix").isWithin(CanonPath("/"))); ASSERT_TRUE(CanonPath("/").isWithin(CanonPath("/")));
ASSERT_TRUE(CanonPath("/").isWithin(CanonPath("/")));
}
} }
TEST(CanonPath, sort) { TEST(CanonPath, sort) {
@ -127,29 +125,38 @@ namespace nix {
} }
TEST(CanonPath, allowed) { TEST(CanonPath, allowed) {
{ std::set<CanonPath> allowed {
std::set<CanonPath> allowed { CanonPath("foo/bar"),
CanonPath("foo/bar"), CanonPath("foo!"),
CanonPath("foo!"), CanonPath("xyzzy"),
CanonPath("xyzzy"), CanonPath("a/b/c"),
CanonPath("a/b/c"), };
};
ASSERT_TRUE (CanonPath("foo/bar").isAllowed(allowed)); ASSERT_TRUE (CanonPath("foo/bar").isAllowed(allowed));
ASSERT_TRUE (CanonPath("foo/bar/bla").isAllowed(allowed)); ASSERT_TRUE (CanonPath("foo/bar/bla").isAllowed(allowed));
ASSERT_TRUE (CanonPath("foo").isAllowed(allowed)); ASSERT_TRUE (CanonPath("foo").isAllowed(allowed));
ASSERT_FALSE(CanonPath("bar").isAllowed(allowed)); ASSERT_FALSE(CanonPath("bar").isAllowed(allowed));
ASSERT_FALSE(CanonPath("bar/a").isAllowed(allowed)); ASSERT_FALSE(CanonPath("bar/a").isAllowed(allowed));
ASSERT_TRUE (CanonPath("a").isAllowed(allowed)); ASSERT_TRUE (CanonPath("a").isAllowed(allowed));
ASSERT_TRUE (CanonPath("a/b").isAllowed(allowed)); ASSERT_TRUE (CanonPath("a/b").isAllowed(allowed));
ASSERT_TRUE (CanonPath("a/b/c").isAllowed(allowed)); ASSERT_TRUE (CanonPath("a/b/c").isAllowed(allowed));
ASSERT_TRUE (CanonPath("a/b/c/d").isAllowed(allowed)); ASSERT_TRUE (CanonPath("a/b/c/d").isAllowed(allowed));
ASSERT_TRUE (CanonPath("a/b/c/d/e").isAllowed(allowed)); ASSERT_TRUE (CanonPath("a/b/c/d/e").isAllowed(allowed));
ASSERT_FALSE(CanonPath("a/b/a").isAllowed(allowed)); ASSERT_FALSE(CanonPath("a/b/a").isAllowed(allowed));
ASSERT_FALSE(CanonPath("a/b/d").isAllowed(allowed)); ASSERT_FALSE(CanonPath("a/b/d").isAllowed(allowed));
ASSERT_FALSE(CanonPath("aaa").isAllowed(allowed)); ASSERT_FALSE(CanonPath("aaa").isAllowed(allowed));
ASSERT_FALSE(CanonPath("zzz").isAllowed(allowed)); ASSERT_FALSE(CanonPath("zzz").isAllowed(allowed));
ASSERT_TRUE (CanonPath("/").isAllowed(allowed)); ASSERT_TRUE (CanonPath("/").isAllowed(allowed));
} }
TEST(CanonPath, makeRelative) {
CanonPath d("/foo/bar");
ASSERT_EQ(d.makeRelative(CanonPath("/foo/bar")), ".");
ASSERT_EQ(d.makeRelative(CanonPath("/foo")), "..");
ASSERT_EQ(d.makeRelative(CanonPath("/")), "../..");
ASSERT_EQ(d.makeRelative(CanonPath("/foo/bar/xyzzy")), "xyzzy");
ASSERT_EQ(d.makeRelative(CanonPath("/foo/bar/xyzzy/bla")), "xyzzy/bla");
ASSERT_EQ(d.makeRelative(CanonPath("/foo/xyzzy/bla")), "../xyzzy/bla");
ASSERT_EQ(d.makeRelative(CanonPath("/xyzzy/bla")), "../../xyzzy/bla");
} }
} }