internal/rosa/python: optionally install before check

Some test suites require package to be installed globally.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/python.go

@@ -115,6 +115,8 @@ type PipHelper struct {
 	BuildIsolation bool
 	// Whether to enter source after install.
 	EnterSource bool
+	// Whether to install to build environment after install.
+	Install bool
 	// Runs after install.
 	Script string
 }
@@ -144,6 +146,7 @@ func (attr *PipHelper) script(name string) string {
 	if attr == nil {
 		attr = new(PipHelper)
 	}
+	sourcePath := AbsUsrSrc.Append(name).Append(attr.Append...)
 
 	var extra string
 	if !attr.BuildIsolation {
@@ -152,6 +155,14 @@ func (attr *PipHelper) script(name string) string {
 	}
 
 	script := attr.Script
+	if attr.Install {
+		script = `pip3 install \
+	--no-index \
+	--prefix=/system \
+	--no-build-isolation \
+	'` + sourcePath.String() + `'
+` + script
+	}
 	if attr.EnterSource {
 		script = "cd '/usr/src/" + name + "'\n" + script
 	}
@@ -161,7 +172,7 @@ pip3 install \
 	--no-index \
 	--prefix=/system \
 	--root=/work \` + extra + `
-	'` + AbsUsrSrc.Append(name).Append(attr.Append...).String() + `'
+	'` + sourcePath.String() + `'
 ` + script
 }