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From: Amolith <amolith@secluded.site>
To: ~whereswaldon/arbor-dev@lists.sr.ht
Cc: Amolith <amolith@secluded.site>
Subject: [PATCH 08/12] Add copy function for writing from embedded fs
Date: Wed, 20 Jul 2022 23:09:57 -0400
Message-Id: <20220721031001.97027-9-amolith@secluded.site>
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Signed-off-by: Amolith <amolith@secluded.site>
---
 setup.go | 34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/setup.go b/setup.go
index ca0a3b4..f99f401 100644
--- a/setup.go
+++ b/setup.go
@@ -61,14 +61,13 @@ func Users() error {
 }
 
 func Sudoers() error {
-	fmt.Println("Running target sudoers")
-  return sh.Run("cp", "files/sudoers", "/etc/sudoers")
+	log.Println("Running target sudoers")
+	return copy("files/sudoers", "/etc/sudoers")
 }
 
 func SshConfig() error {
-	fmt.Println("Running target ssh_config")
-	err := sh.Run("cp", "files/sshd_config", "/etc/ssh/sshd_config")
-
+	log.Println("Running target ssh_config")
+	err := copy("files/sshd_config", "/etc/sshd/sshd_config")
 	if err != nil {
 		return err
 	}
@@ -192,6 +191,31 @@ func Caddy() error {
 	return sh.Run("systemctl", "restart", "caddy")
 }
 
+// copy() copies the source rfile from the embedded filesystem to the
+// destination wfile on the host filesystem.
+func copy(rfile string, wfile string) error {
+	log.Println("Copying", rfile, "to", wfile)
+
+	// Open rfile (read file) and stores it in sfile (source file)
+	sfile, err := files.Open(rfile)
+	if err != nil {
+		return err
+	}
+
+	// Open wfile (write file) stores it in dfile (destination file)
+	dfile, err := os.OpenFile(wfile, os.O_CREATE|os.O_RDWR, 0660)
+	if err != nil {
+		return err
+	}
+
+	// Write sfile to filesystem and discard number of bytes written
+	_, err = io.Copy(dfile, sfile)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 // config() takes source template and destination file arguments and executes
 // the template replacing `hostname` with the system's hostname.
 func config(rfile string, wfile string) error {
-- 
2.37.1