commit 1cb46f007dad47a45d2c2d32aaeee11372f95309
from: Stefan Sperling <stsp@stsp.name>
date: Sat Nov 21 15:34:19 2020 UTC

consistently label removed files as "/dev/null" in diff headers

commit - c4cd9c5b87f894217b6aee09f12884f3db44aaf4
commit + 1cb46f007dad47a45d2c2d32aaeee11372f95309
blob - f48f80f88a4377e0ddd59fea3e98da4649a1d494
blob + a1db0dab0c21289d579451ec66a2883d5af498a6
--- lib/diff.c
+++ lib/diff.c
@@ -166,7 +166,8 @@ diff_blobs(off_t **line_offsets, size_t *nlines,
 		goto done;
 
 	if (outfile) {
-		err = got_diffreg_output(line_offsets, nlines, result, f1, f2,
+		err = got_diffreg_output(line_offsets, nlines, result,
+		    blob1 != NULL, blob2 != NULL,
 		    label1 ? label1 : idstr1,
 		    label2 ? label2 : idstr2,
 		    GOT_DIFF_OUTPUT_UNIDIFF, diff_context, outfile);
@@ -255,9 +256,11 @@ diff_blob_file(struct got_diffreg_result **resultp,
 		goto done;
 
 	if (outfile) {
-		err = got_diffreg_output(NULL, NULL, result, f1, f2,
-		    label2, label2, GOT_DIFF_OUTPUT_UNIDIFF, diff_context,
-		    outfile);
+		err = got_diffreg_output(NULL, NULL, result,
+		    blob1 != NULL, f2 != NULL,
+		    label2, /* show local file's path, not a blob ID */
+		    label2, GOT_DIFF_OUTPUT_UNIDIFF,
+		    diff_context, outfile);
 		if (err)
 			goto done;
 	}
@@ -862,8 +865,8 @@ got_diff_files(struct got_diffreg_result **resultp,
 
 	if (outfile) {
 		err = got_diffreg_output(NULL, NULL, diffreg_result,
-		    f1, f2, label1, label2, GOT_DIFF_OUTPUT_UNIDIFF,
-		    diff_context, outfile);
+		    f1 != NULL, f2 != NULL, label1, label2,
+		    GOT_DIFF_OUTPUT_UNIDIFF, diff_context, outfile);
 		if (err)
 			goto done;
 	}
blob - 7b8449a42173543736e1f5d0836bb64451ab832f
blob + 0526cfdab94262bbc3d44a427af97d56d5deb7b8
--- lib/diff3.c
+++ lib/diff3.c
@@ -227,7 +227,7 @@ diffreg(BUF **d, const char *path1, const char *path2)
 	if (err)
 		goto done;
 
-	err = got_diffreg_output(NULL, NULL, diffreg_result, f1, f2, "", "",
+	err = got_diffreg_output(NULL, NULL, diffreg_result, 1, 1, "", "",
 	    GOT_DIFF_OUTPUT_EDSCRIPT, 0, outfile);
 	if (err)
 		goto done;
blob - 8683b991a4378f8e61d26b25a83570f7cf3a3351
blob + 918b50bbce65306ade20a6e42612dd9e4ad88aac
--- lib/diffreg.c
+++ lib/diffreg.c
@@ -278,16 +278,22 @@ done:
 
 const struct got_error *
 got_diffreg_output(off_t **line_offsets, size_t *nlines,
-    struct got_diffreg_result *diff_result, FILE *f1, FILE *f2,
+    struct got_diffreg_result *diff_result, int f1_exists, int f2_exists,
     const char *path1, const char *path2,
     enum got_diff_output_format output_format, int context_lines, FILE *outfile)
 {
 	struct diff_input_info info = {
 		.left_path = path1,
 		.right_path = path2,
+		.flags = 0,
 	};
 	int rc;
 	struct diff_output_info *output_info;
+
+	if (!f1_exists)
+		info.flags |= DIFF_INPUT_LEFT_NONEXISTENT;
+	if (!f2_exists)
+		info.flags |= DIFF_INPUT_RIGHT_NONEXISTENT;
 
 	switch (output_format) {
 	case GOT_DIFF_OUTPUT_UNIDIFF:
blob - f3e58cc505cffa4e06ca6a0ec16396a3e5307747
blob + ae0e6d73bc7b11bc4dac33b1f7aca5cda1ce9071
--- lib/got_lib_diff.h
+++ lib/got_lib_diff.h
@@ -52,7 +52,7 @@ const struct got_error *got_diff_prepare_file(FILE *, 
 const struct got_error *got_diffreg(struct got_diffreg_result **, FILE *,
     FILE *, enum got_diff_algorithm, int, int);
 const struct got_error *got_diffreg_output(off_t **, size_t *,
-    struct got_diffreg_result *, FILE *, FILE *, const char *, const char *,
+    struct got_diffreg_result *, int, int, const char *, const char *,
     enum got_diff_output_format, int, FILE *);
 const struct got_error *got_diffreg_result_free(struct got_diffreg_result *);
 const struct got_error *got_diffreg_result_free_left(
blob - 92cd8f39cbdc7a59932a05599b57b808a8814472
blob + 883be7a1fb5bdd2de7ed9df74a676c22d4a2c869
--- regress/cmdline/diff.sh
+++ regress/cmdline/diff.sh
@@ -47,12 +47,12 @@ test_diff_basic() {
 		>> $testroot/stdout.expected
 	echo 'file + /dev/null' >> $testroot/stdout.expected
 	echo '--- beta' >> $testroot/stdout.expected
-	echo '+++ beta' >> $testroot/stdout.expected
+	echo '+++ /dev/null' >> $testroot/stdout.expected
 	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
 	echo '-beta' >> $testroot/stdout.expected
 	echo 'blob - /dev/null' >> $testroot/stdout.expected
 	echo 'file + new' >> $testroot/stdout.expected
-	echo '--- new' >> $testroot/stdout.expected
+	echo '--- /dev/null' >> $testroot/stdout.expected
 	echo '+++ new' >> $testroot/stdout.expected
 	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
 	echo '+new file' >> $testroot/stdout.expected
@@ -446,13 +446,13 @@ test_diff_symlinks_in_work_tree() {
 		cut -d' ' -f 1 >> $testroot/stdout.expected
 	echo 'file + /dev/null' >> $testroot/stdout.expected
 	echo '--- nonexistent.link' >> $testroot/stdout.expected
-	echo '+++ nonexistent.link' >> $testroot/stdout.expected
+	echo '+++ /dev/null' >> $testroot/stdout.expected
 	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
 	echo '-nonexistent' >> $testroot/stdout.expected
 	echo '\ No newline at end of file' >> $testroot/stdout.expected
 	echo 'blob - /dev/null' >> $testroot/stdout.expected
 	echo 'file + zeta.link' >> $testroot/stdout.expected
-	echo '--- zeta.link' >> $testroot/stdout.expected
+	echo '--- /dev/null' >> $testroot/stdout.expected
 	echo '+++ zeta.link' >> $testroot/stdout.expected
 	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
 	echo '+epsilon/zeta' >> $testroot/stdout.expected
@@ -600,7 +600,8 @@ test_diff_binary_files() {
 	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
 	echo 'blob - /dev/null' >> $testroot/stdout.expected
 	echo 'file + foo' >> $testroot/stdout.expected
-	echo "Binary files foo and foo differ" >> $testroot/stdout.expected
+	echo "Binary files /dev/null and foo differ" \
+		>> $testroot/stdout.expected
 
 	(cd $testroot/wt && got diff > $testroot/stdout)
 	cmp -s $testroot/stdout.expected $testroot/stdout
@@ -614,7 +615,7 @@ test_diff_binary_files() {
 	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
 	echo 'blob - /dev/null' >> $testroot/stdout.expected
 	echo 'file + foo' >> $testroot/stdout.expected
-	echo '--- foo' >> $testroot/stdout.expected
+	echo '--- /dev/null' >> $testroot/stdout.expected
 	echo '+++ foo' >> $testroot/stdout.expected
 	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
 	printf '+\377\377\0\0\377\377\0\0\n' >> $testroot/stdout.expected
blob - 6b88ae02ec91ba9a708d70c67ddc62cdcfe66a03
blob + 053325225ecc1c55962ba876ee2610f161762fa3
--- regress/cmdline/unstage.sh
+++ regress/cmdline/unstage.sh
@@ -721,7 +721,7 @@ test_unstage_patch_added() {
 	echo "diff $commit_id $testroot/wt" > $testroot/stdout.expected
 	echo 'blob - /dev/null' >> $testroot/stdout.expected
 	echo 'file + epsilon/new' >> $testroot/stdout.expected
-	echo "--- epsilon/new" >> $testroot/stdout.expected
+	echo "--- /dev/null" >> $testroot/stdout.expected
 	echo "+++ epsilon/new" >> $testroot/stdout.expected
 	echo "@@ -0,0 +1 @@" >> $testroot/stdout.expected
 	echo "+new" >> $testroot/stdout.expected
@@ -791,7 +791,7 @@ test_unstage_patch_removed() {
 		>> $testroot/stdout.expected
 	echo 'file + /dev/null' >> $testroot/stdout.expected
 	echo "--- beta" >> $testroot/stdout.expected
-	echo "+++ beta" >> $testroot/stdout.expected
+	echo "+++ /dev/null" >> $testroot/stdout.expected
 	echo "@@ -1 +0,0 @@" >> $testroot/stdout.expected
 	echo "-beta" >> $testroot/stdout.expected
 	cmp -s $testroot/stdout.expected $testroot/stdout
blob - 01cca03963ab7106310fd5a83a41dcce92cfe2d2
blob + 543f12cdcea65ac0fd3cc061ea7e25cac98e6d08
--- regress/cmdline/update.sh
+++ regress/cmdline/update.sh
@@ -1016,7 +1016,7 @@ test_update_conflict_wt_rm_vs_repo_edit() {
 		>> $testroot/stdout.expected
 	echo 'file + /dev/null' >> $testroot/stdout.expected
 	echo '--- beta' >> $testroot/stdout.expected
-	echo '+++ beta' >> $testroot/stdout.expected
+	echo '+++ /dev/null' >> $testroot/stdout.expected
 	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
 	echo '-modified beta' >> $testroot/stdout.expected