Subject: Re: cygwin-doc post install script failures
From: Brian Inglis <[email-masked]>
To: [email-masked]
Date: Wed, 16 Dec 2020 15:53:20 -0700
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>

On 2020-12-15 13:51, Marco Atzeri via Cygwin wrote:
> On 15.12.2020 21:03, Brian Inglis wrote:
>> On 2020-12-15 01:43, Marco Atzeri via Cygwin wrote:
>>> Not a recent bug but annoying anyway
>>>
>>> It seems the post-install script is not considering that the
>>> installation can be in a disk different from C: , properly
>>> in this case D:
>>
>> The post-install script does not care as mkshortcut uses POSIX paths.
>> Could you please check your paths with:
>>
>>      $ which -a mkshortcut
>>      /usr/bin/mkshortcut
> 
> all same
> 
>>
>>> 2020/12/15 08:40:13 running: d:\cygwin32\bin\bash.exe --norc --noprofile 
>>> "/etc/postinstall/cygwin-doc.sh"
>>> mkshortcut: Saving "/cygdrive/c/ProgramData/Microsoft/Windows/Start 
>>> Menu/Programs/D:/cygwin32/Cygwin (32-bit)/User Guide (PDF).lnk" failed; does 
>>> the target directory exist?
>>> mkshortcut: Saving "/cygdrive/c/ProgramData/Microsoft/Windows/Start 
>>> Menu/Programs/D:/cygwin32/Cygwin (32-bit)/User Guide (HTML).lnk" failed; does 
>>> the target directory exist?
>>
>> Please try:
>>
>>      $ sh --version
>>      GNU bash, version 4.4.12(3)-release (x86_64-unknown-cygwin)
>>      ...
>>
>> Could you please try rerunning the p-i script under sh -vx and post the 
>> output, as I can not see any way to rearrange the inputs and outputs to get 
>> that result, unless read or mkshortcut are damaged!
>>
>>> $ ls "/cygdrive/c/ProgramData/Microsoft/Windows/Start Menu/Programs/" | grep 
>>> Cygwin
>>> Cygwin
>>> Cygwin (32-bit)
>>
>> $ ll "$(cygpath -A -P -U)"/Cygwin*
>>
> 
> It works, but it is different from running under setup, as it is using
> 
> /proc/cygdrive/c/Users/Marco/AppData/Roaming/Microsoft/Windows/Start 
> Menu/Programs/Cygwin (32-bit)/

Thanks Marco,

Looks like problem may be memory allocation in mkshortcut.c(xstrndup), so have 
attached patches to apply to that source (from cygport? or amnually), and to p-i 
script to get strace.

So could you please apply the attached patch to /etc/postinstall/cygwin-doc.sh, 
and retry your manual p-i script rerun prefixed with CYGWINFORALL=-A 
/etc/postinstall/cygwin-doc.sh (may need elevated admin rights), and save that 
strace output; then retry your cygwin-doc setup, and save that strace output; 
then apply the attached mkshortcut.c patch, rebuild mkshortcut, retry your 
cygwin-doc setup, and save that strace output.

Hopefully the last try will no longer fail, otherwise I will have to set up my 
environment to reproduce the error.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
--- a/etc/postinstall/cygwin-doc.sh	2020-07-07 04:30:32.868445900 -0600
+++ b/etc/postinstall/cygwin-doc.sh	2020-12-16 15:38:03.318870800 -0700
@@ -53,7 +53,8 @@ fi
 # create User Guide and API PDF and HTML shortcuts
 while read target name desc
 do
-	[ -r "$target" ] && $mks $CYGWINFORALL -P -n "Cygwin${wow64}/$name" -d "$desc" -- $target
+	[ -w /tmp/mkshortcut.strace ] && trace='' || trace='/bin/strace -o /tmp/mkshortcut.strace'
+	[ -r "$target" ] && $trace $mks $CYGWINFORALL -P -n "Cygwin${wow64}/$name" -d "$desc" -- $target
 done <<EOF
 $doc/cygwin-ug-net.pdf		User\ Guide\ \(PDF\)  Cygwin\ User\ Guide\ PDF
 $html/cygwin-ug-net/index.html	User\ Guide\ \(HTML\) Cygwin\ User\ Guide\ HTML
diff --git a/src/mkshortcut/mkshortcut.c b/src/mkshortcut/mkshortcut.c
index 6707eb43e3d0..f4ea1cc38b7b 100644
--- origsrc/mkshortcut/mkshortcut.c
+++ src/mkshortcut/mkshortcut.c
@@ -382,7 +382,7 @@ exit:
 static char *
 xstrndup (const char *string, size_t n)
 {
-  char *s = strndup (string, n);
+  char *s = strndup (string, n + 1);
   if (!s)
   {
     fprintf (stderr, "%s: out of memory\n", program_name);
@@ -395,7 +395,7 @@ static char *
 xstrncat (char **dest, const char *add, size_t n)
 {
   size_t len = strlen (*dest) + n + 1;
-  char *s = (char *) realloc (*dest, len * sizeof (char));
+  char *s = realloc (*dest, len);
   if (!s)
   {
     fprintf (stderr, "%s: out of memory\n", program_name);
--
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