From 3d156e316138c051b2acdd03f741029237a7ee4e Mon Sep 17 00:00:00 2001
From: Ivo Capanema <ivoliveirabh@hotmail.com>
Date: Wed, 9 Nov 2022 00:52:03 -0300
Subject: [PATCH] added build archive exists check

---
 reinstall-magisk-on-lineageos | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/reinstall-magisk-on-lineageos b/reinstall-magisk-on-lineageos
index 086f9d4..6fc9576 100755
--- a/reinstall-magisk-on-lineageos
+++ b/reinstall-magisk-on-lineageos
@@ -42,6 +42,15 @@ get_build_url() {
         head -1
 }
 
+check_exists_latest_lineageos_build() {
+    # The --location lets curl follow the redirection.
+    curl --location "$(get_build_url)?sha256" --output /tmp/lineageos.sha256
+    hash1=$( awk '{print $1}' lineageos.sha256 )
+    hash2=$( sha256sum lineageos.zip | awk '{print $1}' )
+    [[ "$hash1" =~ "$hash2" ]]
+    return
+}
+
 download_latest_lineageos_build() {
     # The --location lets curl follow the redirection.
     curl --location "$(get_build_url)" --output /tmp/lineageos.zip
@@ -163,8 +172,12 @@ main() {
     is_rooted_debugging_enabled
     print_message "Checking on phone if Magisk is installed"
     check_magisk_app
-    print_message "Downloading build archive from $(get_build_url)"
-    download_latest_lineageos_build
+    if check_exists_latest_lineageos_build; then
+        print_message "Build archive already exists, skipping download"
+    else
+        print_message "Downloading build archive from $(get_build_url)"
+        download_latest_lineageos_build
+    fi
     print_message "Extracting 'boot.img' from build archive in /tmp/boot.img"
     extract_boot_image
     print_message "Copying from PC to phone the boot image in /sdcard/Download/boot.img"