1 files changed, 117 insertions, 0 deletions
diff --git a/doPatch.findByPatchId.go b/doPatch.findByPatchId.go
new file mode 100644
index 0000000..6882055
--- /dev/null
+++ b/doPatch.findByPatchId.go
@@ -0,0 +1,117 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func searchAllCommits(targetPatchID string) (string, error) {
+	revListArgs := []string{"--all"}
+	cmdRevList := exec.Command("git", append([]string{"rev-list"}, revListArgs...)...)
+
+	// We'll read the commit hashes from the command's standard output.
+	revListStdout, err := cmdRevList.StdoutPipe()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error creating rev-list stdout pipe: %v\n", err)
+		return "", err
+	}
+
+	// Start the command but don't wait for it to finish yet.
+	if err := cmdRevList.Start(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error starting git rev-list: %v\n", err)
+		return "", err
+	}
+
+	var commitHash string
+	// 3. Process the stream of commit hashes line by line.
+	scanner := bufio.NewScanner(revListStdout)
+	found := false
+	for scanner.Scan() {
+		commitHash = scanner.Text()
+
+		// 4. For each commit, calculate its patch ID.
+		calculatedIDs, err := getPatchIDForCommit(commitHash)
+		if err != nil {
+			// Log the error but continue trying other commits.
+			fmt.Fprintf(os.Stderr, "Warning: could not get patch-id for %s: %v\n", commitHash, err)
+			continue
+		}
+
+		// 5. Compare the calculated IDs with our target.
+		for _, id := range calculatedIDs {
+			if id == targetPatchID {
+				fmt.Printf("Found matching commit: %s\n", commitHash)
+				found = true
+				return commitHash, nil
+				// We could exit here, but continuing will find all duplicates (e.g., from cherry-picks).
+			}
+		}
+	}
+
+	// Wait for the rev-list command to finish and check for errors.
+	if err := cmdRevList.Wait(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error running git rev-list: %v\n", err)
+		return "", err
+	}
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error reading commit hashes: %v\n", err)
+		return "", err
+	}
+
+	if !found {
+		fmt.Fprintf(os.Stderr, "No commit found with patch ID: %s\n", targetPatchID)
+		return "not found", errors.New("patchId not found")
+	}
+	return commitHash, nil
+}
+
+// getPatchIDForCommit runs `git show <commit> | git patch-id --stable`
+// and returns the stable and unstable patch IDs.
+func getPatchIDForCommit(commitHash string) ([]string, error) {
+	// Command to get the commit's diff
+	cmdShow := exec.Command("git", "show", commitHash)
+
+	// Command to calculate the patch-id from stdin
+	cmdPatchID := exec.Command("git", "patch-id", "--stable")
+
+	// Create a pipe to connect the output of cmdShow to the input of cmdPatchID.
+	r, w := io.Pipe()
+	cmdShow.Stdout = w
+	cmdPatchID.Stdin = r
+
+	var patchIDOutput bytes.Buffer
+	cmdPatchID.Stdout = &patchIDOutput
+
+	// Start both commands.
+	if err := cmdShow.Start(); err != nil {
+		return nil, fmt.Errorf("failed to start git-show: %w", err)
+	}
+	if err := cmdPatchID.Start(); err != nil {
+		return nil, fmt.Errorf("failed to start git-patch-id: %w", err)
+	}
+
+	// Wait for 'show' to finish writing to the pipe, then close the writer.
+	// This will signal EOF to the 'patch-id' command's stdin.
+	errShow := cmdShow.Wait()
+	w.Close()
+	if errShow != nil {
+		return nil, fmt.Errorf("git-show failed: %w", errShow)
+	}
+
+	// Now wait for 'patch-id' to finish reading and processing.
+	errPatchID := cmdPatchID.Wait()
+	if errPatchID != nil {
+		return nil, fmt.Errorf("git-patch-id failed: %w", errPatchID)
+	}
+
+	// The output is typically "<stable_id> <unstable_id>".
+	// We split the string by whitespace to get both.
+	ids := strings.Fields(patchIDOutput.String())
+	return ids, nil
+}