From 965129eb3b23b64f00472a4853dd4151dc3dee75 Mon Sep 17 00:00:00 2001
From: Tristan Riehs <tristan.riehs@inria.fr>
Date: Tue, 30 Dec 2025 11:16:32 +0100
Subject: Create routine for copying a file

Also restrict access rights.
---
 src/main.c | 83 ++++++++++++++++++++++++++++----------------------------------
 1 file changed, 38 insertions(+), 45 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index c13c14a..d193601 100644
--- a/src/main.c
+++ b/src/main.c
@@ -79,6 +79,42 @@ static void assert_db_exists(void)
 	exit(EXIT_FAILURE);
 }
 
+/* Copy the file whose path is IN at path OUT. OUT is created or overwritten if
+ * needed. */
+static void copy_file(const char *in, const char *out)
+{
+	int in_fd;
+	int out_fd;
+	int rc;
+	ssize_t written_bytes;
+	in_fd = open(in, O_RDONLY);
+	if (in_fd == -1) {
+		fprintf(stderr, "open: %s:", in);
+		perror("");
+		exit(EXIT_FAILURE);
+	}
+	out_fd = open(out, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+	if (out_fd == -1) {
+		fprintf(stderr, "open: %s:", out);
+		perror("");
+		exit(EXIT_FAILURE);
+	}
+	while ((written_bytes = sendfile(out_fd, in_fd, NULL, 4096)) == 4096)
+		;
+	if (written_bytes == -1) {
+		perror("sendfile");
+		exit(EXIT_FAILURE);
+	}
+	rc = fchmod(out_fd, 0400);
+	if (rc == -1) {
+		fprintf(stderr, "chmod: %s: ", out);
+		perror("");
+		exit(EXIT_FAILURE);
+	}
+	close(in_fd);
+	close(out_fd);
+}
+
 /* Prompt the user for yes or no (default is yes). Before calling, a prompt
  * should be printed to stdout, eventually not with an ending newline. */
 static int prompt_yes_no(void)
@@ -326,32 +362,14 @@ static void ftag_export(int argc, char **argv)
 	ssize_t line_len;
 	char *line = malloc(line_size);
 	char in[512];
-	int in_fd;
 	char out[128];
 	char extension[16];
-	int out_fd;
 	while ((line_len = getline(&line, &line_size, stdin)) != -1) {
 		remove_ending_newline(line);
 		ftag_file_get_extension(extension, sizeof(extension), line);
 		strbuild(in, "%s/files/%s", FTAG_ROOT, line);
 		strbuild(out, "%s/%s.%s", tmp_dir, line, extension);
-		in_fd = open(in, O_RDONLY);
-		if (in_fd == -1) {
-			fprintf(stderr, "open: %s:", in);
-			perror("");
-			exit(EXIT_FAILURE);
-		}
-		out_fd = open(out, O_WRONLY | O_CREAT, 0644);
-		if (out_fd == -1) {
-			fprintf(stderr, "open: %s:", out);
-			perror("");
-			exit(EXIT_FAILURE);
-		}
-		ssize_t written_bytes;
-		while ((written_bytes = sendfile(out_fd, in_fd, NULL, 4096)) == 4096)
-			;
-		close(in_fd);
-		close(out_fd);
+		copy_file(in, out);
 	}
 	free(line);
 
@@ -557,33 +575,8 @@ ftag_add_one_file(sqlite3 *db, int *next_id, const char *file, uint32_t file_sum
 	char new_path[512];
 	memset(new_path, 0, sizeof(new_path));
 	strbuild(new_path, "%s/files/%s", FTAG_ROOT, canonical_name);
-	int out_fd = open(new_path, O_WRONLY | O_CREAT, 0644);
-
-	if (out_fd == -1) {
-		fprintf(stderr, "open: \"%s\": ", new_path);
-		perror("");
-		exit(EXIT_FAILURE);
-	}
-
-	int in_fd = open(file, O_RDONLY);
-
-	if (in_fd == -1) {
-		fprintf(stderr, "open: \"%s\": ", file);
-		perror("");
-		exit(EXIT_FAILURE);
-	}
-
-	ssize_t written_bytes;
-	while ((written_bytes = sendfile(out_fd, in_fd, NULL, 4096)) == 4096)
-		;
+	copy_file(file, new_path);
 
-	if (written_bytes == -1) {
-		perror("sendfile");
-		exit(EXIT_FAILURE);
-	}
-
-	close(in_fd);
-	close(out_fd);
 	free(date_str);
 	free(full_name);
 	free(canonical_name);
-- 
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