feat(tools/tvlc): pass list of derivations to depot-scanner r/1711

You can now provide a list of Nix derivations to tvlc to get a git worktree + sparse-checkout containing only the paths needed to build the specified derivations.

Known bugs: even though //third_party is only passed to readdir(), git doesn't know this and includes all of //third_party/*.

Change-Id: I9dccebd3fbff4bb04ebd568175cf0a7e37d71ab3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1826
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

1 files changed, 10 insertions, 0 deletions

diff --git a/tools/depot-scanner/main.go b/tools/depot-scanner/main.go
index 8d69981c0d..2731902589 100644
--- a/tools/depot-scanner/main.go
+++ b/tools/depot-scanner/main.go
@@ -18,6 +18,7 @@ var nixStoreRoot = flag.String("store-path", "/nix/store/", "prefix for all vali
 
 var modeFlag = flag.String("mode", modeArchive, "operation mode. valid values: tar, print")
 var onlyFlag = flag.String("only", "", "only enable the listed output types, comma separated. valid values: DEPOT, STORE, CORE, UNKNOWN")
+var relativeFlag = flag.Bool("relpath", false, "when printing paths, print them relative to the root of their path type")
 
 const (
 	modeArchive = "tar"
@@ -164,16 +165,25 @@ func main() {
 	if *modeFlag == "print" {
 		if enabledPathTypes[pb.PathType_STORE] {
 			for k, _ := range results[nixStorePath] {
+				if *relativePath {
+					k = strings.TrimPrefix(k, *nixStoreRoot)
+					k = strings.TrimPrefix(k, "/")
+				}
 				fmt.Println(k)
 			}
 		}
 		if enabledPathTypes[pb.PathType_DEPOT] {
 			for k, _ := range results[depotPath] {
+				if *relativeFlag {
+					k = strings.TrimPrefix(k, *depotRoot)
+					k = strings.TrimPrefix(k, "/")
+				}
 				fmt.Println(k)
 			}
 		}
 		if enabledPathTypes[pb.PathType_CORE] {
 			for k, _ := range results[corePkgsPath] {
+				// TODO relativeFlag
 				fmt.Println(k)
 			}
 		}