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-rw-r--r--sideband.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/sideband.c b/sideband.c
index 6f9e026732..85bddfdcd4 100644
--- a/sideband.c
+++ b/sideband.c
@@ -183,8 +183,31 @@ int demultiplex_sideband(const char *me, int status,
while ((brk = strpbrk(b, "\n\r"))) {
int linelen = brk - b;
+ /*
+ * For message accross packet boundary, there would have
+ * a nonempty "scratch" buffer from last call of this
+ * function, and there may have a leading CR/LF in "buf".
+ * For this case we should add a clear-to-eol suffix to
+ * clean leftover letters we previously have written on
+ * the same line.
+ */
+ if (scratch->len && !linelen)
+ strbuf_addstr(scratch, suffix);
+
if (!scratch->len)
strbuf_addstr(scratch, DISPLAY_PREFIX);
+
+ /*
+ * A use case that we should not add clear-to-eol suffix
+ * to empty lines:
+ *
+ * For progress reporting we may receive a bunch of
+ * percentage updates followed by '\r' to remain on the
+ * same line, and at the end receive a single '\n' to
+ * move to the next line. We should preserve the final
+ * status report line by not appending clear-to-eol
+ * suffix to this single line break.
+ */
if (linelen > 0) {
maybe_colorize_sideband(scratch, b, linelen);
strbuf_addstr(scratch, suffix);