Remove accidental inclusion of unfinished WI_FILE check

Include some notes about cleanup and accidentally deleting loop-control

Makefile

@@ -1,7 +1,7 @@
 GITREV  ?= $(shell git describe --dirty --always)
 BLDDATE ?= $(shell date -I)
 CR_YEAR ?= $(shell date +%Y)
-VERSION ?= "v0.2.1"
+VERSION ?= "$(shell git describe --tags --always --abbrev=0 2>/dev/null || git rev-parse --short HEAD)"
 
 CFLAGS ?= -Wall -Wextra -Wpedantic -O2 -std=gnu99
 CFLAGS += -DGITREV='"$(GITREV)"'
@@ -10,10 +10,6 @@ CFLAGS += -DCR_YEAR='"$(CR_YEAR)"'
 CFLAGS += -DVERSION='$(VERSION)'
 CFLAGS += $(EXTRA_CFLAGS)
 
-# Soon...
-# CFLAGS += $(shell pkg-config --cflags libudev)
-# LIBS   += $(shell pkg-config --libs libudev)
-
 PREFIX ?= /usr/local
 DESTDIR ?=
 

test.sh

@@ -0,0 +1,65 @@
+#!/usr/env/bin bash
+
+set -e
+# set -x # For debugging
+
+# If you ever mess this up:
+#  $ sudo mknod /dev/loop-control c 10 237
+#  $ sudo chmod 600 /dev/loop-control
+#  $ sudo chown root:root /dev/loop-control
+#
+# For cleanup:
+#  $ sudo find /dev -maxdepth 1 -type b -name 'loop[0-9]*' -exec rm -f {} \;
+
+
+DISKFILE="/tmp/disk.img"
+BINFILE="/tmp/file.bin"
+LOOPNUM=$((RANDOM % 156 + 100))
+LOOPDEV="/dev/loop${LOOPNUM}"
+
+echo "Using device: ${LOOPDEV}"
+
+cleanup() {
+    echo "Cleaning up..."
+    set +e -x
+    sudo losetup -d ${LOOPDEV}
+    sudo rm ${LOOPDEV}
+    sudo rm ${BINFILE} ${DISKFILE}
+}
+
+trap cleanup EXIT INT TERM
+
+if losetup ${LOOPDEV} >/dev/null 2>&1; then
+    echo "${LOOPDEV} already in use" >&2
+    cleanup
+    exit 1
+fi
+
+if [ ! -f ${DISKFILE} ]; then
+    dd if=/dev/zero of=${DISKFILE} bs=1M count=256
+fi
+
+if [ ! -f ${BINFILE} ]; then
+    dd if=/dev/urandom of=${BINFILE} bs=1M count=64
+fi
+
+if [ ! -e ${LOOPDEV} ]; then
+    sudo losetup ${LOOPDEV} ${DISKFILE}
+fi
+
+sudo ./writeimg -nd ${LOOPDEV} ${BINFILE}
+sudo ./writeimg -vnd ${LOOPDEV} ${BINFILE}
+
+sudo ./writeimg -nd ${LOOPDEV} ./writeimg
+sudo ./writeimg -vnd ${LOOPDEV} ./writeimg
+
+sudo ./writeimg -nd ${LOOPDEV} ./LICENSE
+sudo ./writeimg -vnd ${LOOPDEV} ./LICENSE
+
+# Redirect this to avoid confusion
+! sudo ./writeimg -vnd ${LOOPDEV} ./crc32.h 2>/dev/null
+
+GREEN="\e[32m"
+RESET="\e[0m"
+
+echo -e "\n\n${GREEN}Looks good!${RESET}"

writeimg.c

@@ -32,6 +32,10 @@
 #define BLOCKSIZE (1024 * 1024)
 #endif
 
+#define WI_VERIFY (1 << 0)
+#define WI_WRITE  (1 << 1)
+#define WI_ASK    (1 << 2)
+
 #define BYTES_TO_MIB(bts) ((double)bts / (1024 * 1024))
 
 #define BAR_WIDTH 50
@@ -69,14 +73,14 @@ const char help[] =
 const char copyright[] = "Copyright (C) %s Imbus, BSD-2-Clause\n";
 
 struct write_job {
-    char  *filename;
-    char  *dev_name;
+    char  *iname;
+    char  *oname;
     char  *buffer;
     char  *buffer2; /* For memcmp integrity checks */
     size_t bufsize;
     size_t block_size;
     size_t total_bytes;
-    char   verify_only;
+    char   flags;
 } wjob = {0};
 
 typedef struct write_job write_job_t;
@@ -94,8 +98,8 @@ void int_handler(int signum) {
 }
 
 int perform_write(write_job_t *job) {
-    int block_fd = open(job->dev_name, O_RDWR);
-    int file_fd = open(job->filename, O_RDONLY);
+    int block_fd = open(job->oname, O_RDWR);
+    int file_fd = open(job->iname, O_RDONLY);
 
     assert(block_fd >= 0);
     assert(file_fd >= 0);
@@ -114,7 +118,7 @@ int perform_write(write_job_t *job) {
         if (read_bytes == 0) {
             crc = crc32_finalize(crc);
 
-            if (!job->verify_only) {
+            if (job->flags & WI_WRITE) {
                 printf("\nWriting done...\n");
                 assert(job->total_bytes == b_written);
             } else
@@ -124,17 +128,17 @@ int perform_write(write_job_t *job) {
         }
 
         if (read_bytes < 0) {
-            fprintf(stderr, "%s: Read error\n", job->filename);
+            fprintf(stderr, "%s: Read error\n", job->iname);
             perror("Read");
             exit(EXIT_FAILURE);
         }
 
         crc = crc32_update(crc, job->buffer, read_bytes);
 
-        if (!job->verify_only) {
+        if (job->flags & WI_WRITE) {
             ssize_t written_bytes = write(block_fd, job->buffer, read_bytes);
             if (written_bytes < 0) {
-                fprintf(stderr, "%s: Write error\n", job->dev_name);
+                fprintf(stderr, "%s: Write error\n", job->oname);
                 perror("Write");
                 exit(EXIT_FAILURE);
             }
@@ -195,7 +199,7 @@ static const struct option longopts[] = {
 };
 
 int main(int argc, char *argv[]) {
-    printf("%s %s, Rev. %s\n", basename(argv[0]), VERSION, GITREV);
+    printf("%s %s, Rev. %s\n", "WriteIMG", VERSION, GITREV);
 
     /* Line buffering, system allocated */
     setvbuf(stdout, NULL, _IOLBF, 0);
@@ -206,14 +210,18 @@ int main(int argc, char *argv[]) {
     signal(SIGHUP, int_handler);
     signal(SIGTERM, int_handler);
 
-    int ask_permission = 1;
+    wjob.flags = WI_VERIFY | WI_WRITE | WI_ASK;
+
     int c = {0};
     while ((c = getopt_long(argc, argv, "vd:hnV", longopts, 0)) != -1) {
         switch (c) {
-        case 'v': ++wjob.verify_only; continue;
-        case 'd': wjob.dev_name = optarg; continue;
+        case 'v':
+            wjob.flags |= WI_VERIFY;
+            wjob.flags &= ~WI_WRITE;
+            continue;
+        case 'd': wjob.oname = optarg; continue;
         case 'h': break;
-        case 'n': --ask_permission; continue;
+        case 'n': wjob.flags &= ~WI_ASK; continue;
         case 'V': exit(EXIT_SUCCESS);
         }
         printf("In honor of SwePwnage - the OG disk destroyer\n");
@@ -236,27 +244,27 @@ int main(int argc, char *argv[]) {
         exit(EXIT_FAILURE);
     }
 
-    wjob.filename = argv[0];
+    wjob.iname = argv[0];
     struct stat file_stat = {0};
-    if (0 != stat(wjob.filename, &file_stat)) {
+    if (0 != stat(wjob.iname, &file_stat)) {
         printf("File does not exist...\n");
         exit(EXIT_FAILURE);
     }
 
-    if (NULL == wjob.dev_name) {
+    if (NULL == wjob.oname) {
         printf("You need to specify a device.\n");
         exit(EXIT_FAILURE);
     }
 
-    if (0 != strncmp(wjob.dev_name, "/dev/", 4)) {
-        printf("\"%s\" does not appear to be a block device...\n", wjob.dev_name);
+    if (0 != strncmp(wjob.oname, "/dev/", 4)) {
+        printf("\"%s\" does not appear to be a block device...\n", wjob.oname);
         exit(EXIT_FAILURE);
     }
 
     /* Seems to be the cleanest way to check for write perm on a blockdev */
-    int fd = open(wjob.dev_name, O_WRONLY);
+    int fd = open(wjob.oname, O_WRONLY);
     if (fd < 0) {
-        printf("Cannot write to \"%s\", do you have write permissions?\n", wjob.dev_name);
+        printf("Cannot write to \"%s\", do you have write permissions?\n", wjob.oname);
         exit(1);
     }
     close(fd);
@@ -264,13 +272,11 @@ int main(int argc, char *argv[]) {
     wjob.total_bytes = file_stat.st_size;
     assert(file_stat.st_size >= 0);
 
-    if (!wjob.verify_only)
-        printf("Writing \"%s\" (%.1f MiB) to \"%s\"\n",
-               basename(wjob.filename),
-               BYTES_TO_MIB(wjob.total_bytes),
-               wjob.dev_name);
+    if (wjob.flags & WI_WRITE)
+        printf(
+            "Writing \"%s\" (%.1f MiB) to \"%s\"\n", basename(wjob.iname), BYTES_TO_MIB(wjob.total_bytes), wjob.oname);
 
-    if (ask_permission && !wjob.verify_only) {
+    if ((wjob.flags & WI_ASK) && (wjob.flags & WI_WRITE)) {
         printf("Is this okay? (y/N): ");
         fflush(stdout);
         if ('y' != getchar()) {