diff mbox series

[v2,2/2] checkout-index: omit entries with no tempname from --temp output

Message ID 6ece1947c1781ee24a3a72f89a1cba39a5ebec37.1613411136.git.matheus.bernardino@usp.br (mailing list archive)
State Superseded
Headers show
Series checkout-index: some cleanups to --temp and --prefix outputs | expand

Commit Message

Matheus Tavares Feb. 15, 2021, 6:24 p.m. UTC
With --temp (or --stage=all, which implies --temp), checkout-index
writes a list to stdout associating temporary file names to the entries'
names. But if it fails to write an entry, and the failure happens before
even assigning a temporary filename to that entry, we get an odd output
line. This can be seen when trying to check out a symlink whose blob is
missing:

$ missing_blob=$(git hash-object --stdin </dev/null)
$ git update-index --add --cacheinfo 120000,$missing_blob,foo
$ git checkout-index --temp foo
error: unable to read sha1 file of foo (e69de29bb2d1d6434b8b29ae775ad8c2e48c5391)
        foo

The 'TAB foo' line is not much useful and it might break scripts that
expect the 'tempname TAB foo' output. So let's omit such entries from
the stdout list (but leaving the error message on stderr).

We could also consider omitting _all_ failed entries from the output
list, but that's probably not a good idea as the associated tempfiles
may have been created even when checkout failed, so scripts may want to
use the output list for cleanup.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
---
 builtin/checkout-index.c | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)
diff mbox series

Patch

diff --git a/builtin/checkout-index.c b/builtin/checkout-index.c
index 4bbfc92dce..023e49e271 100644
--- a/builtin/checkout-index.c
+++ b/builtin/checkout-index.c
@@ -23,22 +23,35 @@  static struct checkout state = CHECKOUT_INIT;
 static void write_tempfile_record(const char *name, const char *prefix)
 {
 	int i;
+	int have_tempname = 0;
 
 	if (CHECKOUT_ALL == checkout_stage) {
-		for (i = 1; i < 4; i++) {
-			if (i > 1)
-				putchar(' ');
-			if (topath[i][0])
-				fputs(topath[i], stdout);
-			else
-				putchar('.');
+		for (i = 1; i < 4; i++)
+			if (topath[i][0]) {
+				have_tempname = 1;
+				break;
+			}
+
+		if (have_tempname) {
+			for (i = 1; i < 4; i++) {
+				if (i > 1)
+					putchar(' ');
+				if (topath[i][0])
+					fputs(topath[i], stdout);
+				else
+					putchar('.');
+			}
 		}
-	} else
+	} else if (topath[checkout_stage][0]) {
+		have_tempname = 1;
 		fputs(topath[checkout_stage], stdout);
+	}
 
-	putchar('\t');
-	write_name_quoted_relative(name, prefix, stdout,
-				   nul_term_line ? '\0' : '\n');
+	if (have_tempname) {
+		putchar('\t');
+		write_name_quoted_relative(name, prefix, stdout,
+					   nul_term_line ? '\0' : '\n');
+	}
 
 	for (i = 0; i < 4; i++) {
 		topath[i][0] = 0;