From 481f40a9a020a73683acde466b73e6d8a269ae8d Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 27 Oct 2014 16:53:04 +0000
Subject: [PATCH] Replace many calls to stat with new wrapper stat_exists;
 improves error handling and simplifies the code.

---
 debian/changelog |  7 +++++++
 dgit             | 32 ++++++++++++++++++--------------
 2 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index b7989693..48e3c784 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+dgit (0.23~) unstable; urgency=low
+
+  * Replace many calls to stat with new wrapper stat_exists; improves
+    error handling and simplifies the code.
+
+ --
+
 dgit (0.22.1) unstable; urgency=high
 
   * Use Dpkg::Version::version_compare everywhere, not
diff --git a/dgit b/dgit
index f571933a..6fd8f7d7 100755
--- a/dgit
+++ b/dgit
@@ -177,6 +177,13 @@ sub changedir ($) {
     chdir $newdir or die "chdir: $newdir: $!";
 }
 
+sub stat_exists ($) {
+    my ($f) = @_;
+    return 1 if stat $f;
+    return 0 if $!==&ENOENT;
+    die "stat $f: $!";
+}
+
 #---------- remote protocol support, common ----------
 
 # remote push initiator/responder protocol:
@@ -976,7 +983,7 @@ sub mktree_in_ud_from_only_subdir () {
     $dirs[0] =~ m#^([^/]+)/\.$# or die;
     my $dir = $1;
     changedir $dir;
-    fail "source package contains .git directory" if stat '.git';
+    fail "source package contains .git directory" if stat_exists '.git';
     die $! unless $!==&ENOENT;
     runcmd qw(git init -q);
     rmtree('.git/objects');
@@ -1140,11 +1147,9 @@ sub complete_file_from_dsc ($$) {
     my $tf = "$dstdir/$f";
     my $downloaded = 0;
 
-    if (stat $tf) {
+    if (stat_exists $tf) {
 	progress "using existing $f";
     } else {
-	die "$tf $!" unless $!==&ENOENT;
-
 	my $furl = $dscurl;
 	$furl =~ s{/[^/]+$}{};
 	$furl .= "/$f";
@@ -1490,7 +1495,7 @@ sub dopush () {
 	push_parse_changelog("$clogpfn");
 
     my $dscpath = "$buildproductsdir/$dscfn";
-    stat $dscpath or
+    stat_exists $dscpath or
 	fail "looked for .dsc $dscfn, but $!;".
 	    " maybe you forgot to build";
 
@@ -1535,10 +1540,9 @@ sub dopush () {
     if (!$changesfile) {
 	my $multi = "$buildproductsdir/".
 	    "${package}_".(stripepoch $cversion)."_multi.changes";
-	if (stat "$multi") {
+	if (stat_exists "$multi") {
 	    $changesfile = $multi;
 	} else {
-	    $!==&ENOENT or die "$multi: $!";
 	    my $pat = "${package}_".(stripepoch $cversion)."_*.changes";
 	    my @cs = glob "$buildproductsdir/$pat";
 	    fail "failed to find unique changes file".
@@ -1621,10 +1625,8 @@ sub cmd_clone {
     }
     $dstdir ||= "$package";
 
-    if (stat $dstdir) {
+    if (stat_exists $dstdir) {
 	fail "$dstdir already exists";
-    } elsif ($! != &ENOENT) {
-	die "$dstdir: $!";
     }
 
     my $cwd_remove;
@@ -1848,7 +1850,8 @@ sub i_resp_file ($) {
     my ($keyword) = @_;
     my $localname = i_method "i_localname", $keyword;
     my $localpath = "$i_tmp/$localname";
-    stat $localpath and badproto \*RO, "file $keyword ($localpath) twice";
+    stat_exists $localpath and
+	badproto \*RO, "file $keyword ($localpath) twice";
     protocol_receive_file \*RO, $localpath;
     i_method "i_file", $keyword;
 }
@@ -2118,8 +2121,9 @@ sub cmd_sbuild {
     changedir "..";
     my $pat = "${package}_".(stripepoch $version)."_*.changes";
     if (act_local()) {
-	stat $dscfn or fail "$dscfn (in parent directory): $!";
-	stat $sourcechanges or fail "$sourcechanges (in parent directory): $!";
+	stat_exist $dscfn or fail "$dscfn (in parent directory): $!";
+	stat_exists $sourcechanges
+	    or fail "$sourcechanges (in parent directory): $!";
 	foreach my $cf (glob $pat) {
 	    next if $cf eq $sourcechanges;
 	    unlink $cf or fail "remove $cf: $!";
@@ -2136,7 +2140,7 @@ sub cmd_sbuild {
     runcmd_ordryrun_local @mergechanges, @changesfiles;
     my $multichanges = "${package}_".(stripepoch $version)."_multi.changes";
     if (act_local()) {
-	stat $multichanges or fail "$multichanges: $!";
+	stat_exists $multichanges or fail "$multichanges: $!";
     }
     printdone "build successful, results in $multichanges\n" or die $!;
 }    
-- 
2.30.2