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go/build: give better explanation for "cannot find package"

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Fixes #4079.

Some example output:

% go install foo/bar
can't load package: package foo/bar: cannot find package "foo/bar" in any of:
        /home/dfc/go/src/pkg/foo/bar (from $GOROOT)
        /home/dfc/src/foo/bar (from $GOPATH)
        /home/dfc/src2/src/foo/bar

% GOPATH= go install foo/bar
can't load package: package foo/bar: cannot find package "foo/bar" in any of:
	/home/dfc/go/src/pkg/foo/bar (from $GOROOT)
	($GOPATH not set)

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6899057
This commit is contained in:
Dave Cheney 2012-12-12 21:38:52 +11:00
parent 5bdf40dcca
commit 11d96dd7f5
2 changed files with 60 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/cmd/go/test.bash
View File

@ -150,6 +150,37 @@ if ! ./testgo list std | cmp -s test_std.list - ; then
fi
rm -f test_std.list
# issue 4096. Validate the output of unsucessful go install foo/quxx
if [ $(./testgo install 'foo/quxx' 2>&1 | grep -c 'cannot find package "foo/quxx" in any of') -ne 1 ] ; then
echo 'go install foo/quxx expected error: .*cannot find package "foo/quxx" in any of'
ok=false
fi
# test GOROOT search failure is reported
if [ $(./testgo install 'foo/quxx' 2>&1 | egrep -c 'foo/quxx \(from \$GOROOT\)$') -ne 1 ] ; then
echo 'go install foo/quxx expected error: .*foo/quxx (from $GOROOT)'
ok=false
fi
# test multiple GOPATH entries are reported separately
if [ $(GOPATH=$(pwd)/testdata/a:$(pwd)/testdata/b ./testgo install 'foo/quxx' 2>&1 | egrep -c 'testdata/./src/foo/quxx') -ne 2 ] ; then
echo 'go install foo/quxx expected error: .*testdata/a/src/foo/quxx (from $GOPATH)\n.*testdata/b/src/foo/quxx'
ok=false
fi
# test (from $GOPATH) annotation is reported for the first GOPATH entry
if [ $(GOPATH=$(pwd)/testdata/a:$(pwd)/testdata/b ./testgo install 'foo/quxx' 2>&1 | egrep -c 'testdata/a/src/foo/quxx \(from \$GOPATH\)$') -ne 1 ] ; then
echo 'go install foo/quxx expected error: .*testdata/a/src/foo/quxx (from $GOPATH)'
ok=false
fi
# but not on the second
if [ $(GOPATH=$(pwd)/testdata/a:$(pwd)/testdata/b ./testgo install 'foo/quxx' 2>&1 | egrep -c 'testdata/b/src/foo/quxx$') -ne 1 ] ; then
echo 'go install foo/quxx expected error: .*testdata/b/src/foo/quxx'
ok=false
fi
# test missing GOPATH is reported
if [ $(GOPATH= ./testgo install 'foo/quxx' 2>&1 | egrep -c '\(\$GOPATH not set\)$') -ne 1 ] ; then
echo 'go install foo/quxx expected error: ($GOPATH not set)'
ok=false
fi
# clean up
rm -rf testdata/bin testdata/bin1
rm -f testgo

30
src/pkg/go/build/build.go
View File

@ -424,6 +424,13 @@ func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Packa
if strings.HasPrefix(path, "/") {
return p, fmt.Errorf("import %q: cannot import absolute path", path)
}
// tried records the location of unsucsessful package lookups
var tried struct {
goroot string
gopath []string
}
// Determine directory from import path.
if ctxt.GOROOT != "" {
dir := ctxt.joinPath(ctxt.GOROOT, "src", "pkg", path)
@ -435,6 +442,7 @@ func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Packa
p.Root = ctxt.GOROOT
goto Found
}
tried.goroot = dir
}
for _, root := range ctxt.gopath() {
dir := ctxt.joinPath(root, "src", path)
@ -445,8 +453,28 @@ func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Packa
p.Root = root
goto Found
}
tried.gopath = append(tried.gopath, dir)
}
return p, fmt.Errorf("import %q: cannot find package", path)
// package was not found
var paths []string
if tried.goroot != "" {
paths = append(paths, fmt.Sprintf("\t%s (from $GOROOT)", tried.goroot))
} else {
paths = append(paths, "\t($GOROOT not set)")
}
var i int
var format = "\t%s (from $GOPATH)"
for ; i < len(tried.gopath); i++ {
if i > 0 {
format = "\t%s"
}
paths = append(paths, fmt.Sprintf(format, tried.gopath[i]))
}
if i == 0 {
paths = append(paths, "\t($GOPATH not set)")
}
return p, fmt.Errorf("cannot find package %q in any of:\n%s", path, strings.Join(paths, "\n"))
}
Found: