fast-import: do not truncate exported marks file

Certain lines of the marks file might be corrupted (or the objects
missing due to a garbage collection), but that's no reason to truncate
the file and essentially destroy the rest of it.

Ideally missing objects should not cause a crash, we could just skip
them, but that's another patch.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/fast-import.c b/fast-import.c
index 9fc7093406b1e2085a3b2180a8506bcd6d486e06..a975c348d8b3f9e9f638897dde8c3e7dc5803e1c 100644 (file)
--- a/fast-import.c
+++ b/fast-import.c
@@ -329,6 +329,7 @@ static const char *export_marks_file;
 static const char *import_marks_file;
 static int import_marks_file_from_stream;
 static int import_marks_file_ignore_missing;
+static int import_marks_file_done;
 static int relative_marks_paths;
 
 /* Our last blob */
@@ -1802,7 +1803,7 @@ static void dump_marks(void)
        static struct lock_file mark_lock;
        FILE *f;
 
-       if (!export_marks_file)
+       if (!export_marks_file || (import_marks_file && !import_marks_file_done))
                return;
 
        if (hold_lock_file_for_update(&mark_lock, export_marks_file, 0) < 0) {
@@ -1835,7 +1836,7 @@ static void read_marks(void)
        if (f)
                ;
        else if (import_marks_file_ignore_missing && errno == ENOENT)
-               return; /* Marks file does not exist */
+               goto done; /* Marks file does not exist */
        else
                die_errno("cannot read '%s'", import_marks_file);
        while (fgets(line, sizeof(line), f)) {
@@ -1865,6 +1866,8 @@ static void read_marks(void)
                insert_mark(mark, e);
        }
        fclose(f);
+done:
+       import_marks_file_done = 1;
 }
 
 

diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 25bb60b2814320b628d3d12af88ee1d394a94217..4bca35c2594bbff4a659e1d6d1dcc5e746956a84 100755 (executable)
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -2650,6 +2650,21 @@ test_expect_success 'R: ignore non-git options' '
        git fast-import <input
 '
 
+test_expect_success 'R: corrupt lines do not mess marks file' '
+       rm -f io.marks &&
+       blob=$(echo hi | git hash-object --stdin) &&
+       cat >expect <<-EOF &&
+       :3 0000000000000000000000000000000000000000
+       :1 $blob
+       :2 $blob
+       EOF
+       cp expect io.marks &&
+       test_must_fail git fast-import --import-marks=io.marks --export-marks=io.marks <<-\EOF &&
+
+       EOF
+       test_cmp expect io.marks
+'
+
 ##
 ## R: very large blobs
 ##