import: rename --verify=sum to --verify=checksum

This is how we call it internally, and also a bit more descriptive.

src/import/import.c

@@ -323,8 +323,8 @@ static int help(int argc, char *argv[], void *userdata) {
                "  -h --help                   Show this help\n"
                "     --version                Show package version\n"
                "     --force                  Force creation of image\n"
-               "     --verify=                Verify downloaded image, one of: 'no', 'sum'\n"
-               "                              'signature'.\n"
+               "     --verify=                Verify downloaded image, one of: 'no',\n"
+               "                              'checksum', 'signature'.\n"
                "     --image-root=            Image root directory\n"
                "     --dkr-index-url=URL      Specify index URL to use for downloads\n\n"
                "Commands:\n"

src/machine/machinectl.c

@@ -2218,8 +2218,8 @@ static int help(int argc, char *argv[], void *userdata) {
                "  -o --output=STRING          Change journal output mode (short,\n"
                "                              short-monotonic, verbose, export, json,\n"
                "                              json-pretty, json-sse, cat)\n"
-               "      --verify=MODE           Verification mode for downloaded images (no, sum,\n"
-               "                              signature)\n"
+               "      --verify=MODE           Verification mode for downloaded images (no,\n"
+               "                              checksum, signature)\n"
                "      --force                 Download image even if already exists\n"
                "      --dkr-index-url=URL     Specify the index URL to use for DKR image\n"
                "                              downloads\n\n"

src/shared/import-util.c

@@ -76,7 +76,7 @@ int import_url_change_last_component(const char *url, const char *suffix, char *
 
 static const char* const import_verify_table[_IMPORT_VERIFY_MAX] = {
         [IMPORT_VERIFY_NO] = "no",
-        [IMPORT_VERIFY_SUM] = "sum",
+        [IMPORT_VERIFY_CHECKSUM] = "checksum",
         [IMPORT_VERIFY_SIGNATURE] = "signature",
 };
 

src/shared/import-util.h

@@ -27,7 +27,7 @@
 
 typedef enum ImportVerify {
         IMPORT_VERIFY_NO,
-        IMPORT_VERIFY_SUM,
+        IMPORT_VERIFY_CHECKSUM,
         IMPORT_VERIFY_SIGNATURE,
         _IMPORT_VERIFY_MAX,
         _IMPORT_VERIFY_INVALID = -1,