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fast-import: Introduce --import-marks-if-exists

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When a frontend uses a marks file to ensure its state persists between
runs, it may represent "clean slate" when bootstrapping with "no marks
yet". In such a case, feeding the last state with --import-marks and
saving the state after the current run with --export-marks would be a
natural thing to do.

The --import-marks option however errors out when the specified marks file
doesn't exist; this makes bootstrapping a bit difficult.  The location of
the marks file becomes backend-dependent when --relative-marks is in
effect, and the frontend cannot check for the existence of the file in
such a case.

The --import-marks-if-exists option does the same thing as --import-marks
but does not flag an error if the named file does not exist yet to help
these frontends.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ramkumar Ramachandra 2011-01-15 12:01:46 +05:30 committed by Junio C Hamano
parent adf872e783
commit dded4f12a4
3 changed files with 72 additions and 3 deletions
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4
Documentation/git-fast-import.txt
View File

@ -78,6 +78,10 @@ OPTIONS
set of marks. If a mark is defined to different values,
the last file wins.
--import-marks-if-exists=<file>::
Like --import-marks but instead of erroring out, silently
skips the file if it does not exist.
--relative-marks::
After specifying --relative-marks= the paths specified
with --import-marks= and --export-marks= are relative

16
fast-import.c
View File

@ -329,6 +329,7 @@ static struct mark_set *marks;
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 relative_marks_paths;
/* Our last blob */
@ -1795,7 +1796,11 @@ static void read_marks(void)
{
char line[512];
FILE *f = fopen(import_marks_file, "r");
if (!f)
if (f)
;
else if (import_marks_file_ignore_missing && errno == ENOENT)
return; /* Marks file does not exist */
else
die_errno("cannot read '%s'", import_marks_file);
while (fgets(line, sizeof(line), f)) {
uintmax_t mark;
@ -2861,7 +2866,8 @@ static char* make_fast_import_path(const char *path)
return strbuf_detach(&abs_path, NULL);
}
static void option_import_marks(const char *marks, int from_stream)
static void option_import_marks(const char *marks,
int from_stream, int ignore_missing)
{
if (import_marks_file) {
if (from_stream)
@ -2875,6 +2881,7 @@ static void option_import_marks(const char *marks, int from_stream)
import_marks_file = make_fast_import_path(marks);
safe_create_leading_directories_const(import_marks_file);
import_marks_file_from_stream = from_stream;
import_marks_file_ignore_missing = ignore_missing;
}
static void option_date_format(const char *fmt)
@ -2974,7 +2981,10 @@ static int parse_one_feature(const char *feature, int from_stream)
if (!prefixcmp(feature, "date-format=")) {
option_date_format(feature + 12);
} else if (!prefixcmp(feature, "import-marks=")) {
option_import_marks(feature + 13, from_stream);
option_import_marks(feature + 13, from_stream, 0);
} else if (!prefixcmp(feature, "import-marks-if-exists=")) {
option_import_marks(feature + strlen("import-marks-if-exists="),
from_stream, 1);
} else if (!prefixcmp(feature, "export-marks=")) {
option_export_marks(feature + 13);
} else if (!strcmp(feature, "cat-blob")) {

55
t/t9300-fast-import.sh
View File

@ -1706,6 +1706,61 @@ test_expect_success \
'cat input | git fast-import --export-marks=other.marks &&
grep :1 other.marks'
test_expect_success 'R: catch typo in marks file name' '
test_must_fail git fast-import --import-marks=nonexistent.marks </dev/null &&
echo "feature import-marks=nonexistent.marks" |
test_must_fail git fast-import
'
test_expect_success 'R: import and output marks can be the same file' '
rm -f io.marks &&
blob=$(echo hi | git hash-object --stdin) &&
cat >expect <<-EOF &&
:1 $blob
:2 $blob
EOF
git fast-import --export-marks=io.marks <<-\EOF &&
blob
mark :1
data 3
hi
EOF
git fast-import --import-marks=io.marks --export-marks=io.marks <<-\EOF &&
blob
mark :2
data 3
hi
EOF
test_cmp expect io.marks
'
test_expect_success 'R: --import-marks=foo --output-marks=foo to create foo fails' '
rm -f io.marks &&
test_must_fail git fast-import --import-marks=io.marks --export-marks=io.marks <<-\EOF
blob
mark :1
data 3
hi
EOF
'
test_expect_success 'R: --import-marks-if-exists' '
rm -f io.marks &&
blob=$(echo hi | git hash-object --stdin) &&
echo ":1 $blob" >expect &&
git fast-import --import-marks-if-exists=io.marks --export-marks=io.marks <<-\EOF &&
blob
mark :1
data 3
hi
EOF
test_cmp expect io.marks
'
cat >input << EOF
feature import-marks=marks.out
feature export-marks=marks.new