[Bug 1837202] [NEW] leading tabs in here-documents are always stripped even when they should not

[Detlev Zundel]

Public bug reported:

Here documents from the command line with tabs are not handled
correctly.  Here is a transcript showing the problem - there is a tab in
front of "This is indented" in the file:

dzu at zarniwoop:~$ cat tab-test
#!/bin/bash

cat <<STOP
This is unindented
	This is indented
STOP
dzu at zarniwoop:~$ bash tab-test
This is unindented
	This is indented
dzu at zarniwoop:~$ echo "Now using mouse to copy&paste here-document"
Now using mouse to copy&paste here-document
dzu at zarniwoop:~$ cat <<STOP
> This is unindented
> This is indented
> STOP
This is unindented
This is indented
dzu at zarniwoop:~$ 

Dash handles this correctly:

dzu at zarniwoop:~$ dash
$ dash tab-test
This is unindented
	This is indented
$ echo "Now using mouse to copy&paste here-document"
Now using mouse to copy&paste here-document
$ cat <<STOP
This is unindented
	This is indented
STOP
> > > This is unindented
	This is indented
$ 

The prompts in the dash output are suspicious but redirecting the output
into a file yields correct output.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: bash 4.4.18-2ubuntu1.2
ProcVersionSignature: Ubuntu 4.18.0-25.26~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-25-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Jul 19 11:45:27 2019
InstallationDate: Installed on 2019-05-28 (51 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: bash
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1837202

Title:
  leading tabs in here-documents are always stripped even when they
  should not

Status in bash package in Ubuntu:
  New

Bug description:
  Here documents from the command line with tabs are not handled
  correctly.  Here is a transcript showing the problem - there is a tab
  in front of "This is indented" in the file:

  dzu at zarniwoop:~$ cat tab-test
  #!/bin/bash

  cat <<STOP
  This is unindented
  	This is indented
  STOP
  dzu at zarniwoop:~$ bash tab-test
  This is unindented
  	This is indented
  dzu at zarniwoop:~$ echo "Now using mouse to copy&paste here-document"
  Now using mouse to copy&paste here-document
  dzu at zarniwoop:~$ cat <<STOP
  > This is unindented
  > This is indented
  > STOP
  This is unindented
  This is indented
  dzu at zarniwoop:~$ 

  Dash handles this correctly:

  dzu at zarniwoop:~$ dash
  $ dash tab-test
  This is unindented
  	This is indented
  $ echo "Now using mouse to copy&paste here-document"
  Now using mouse to copy&paste here-document
  $ cat <<STOP
  This is unindented
  	This is indented
  STOP
  > > > This is unindented
  	This is indented
  $ 

  The prompts in the dash output are suspicious but redirecting the
  output into a file yields correct output.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bash 4.4.18-2ubuntu1.2
  ProcVersionSignature: Ubuntu 4.18.0-25.26~18.04.1-generic 4.18.20
  Uname: Linux 4.18.0-25-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Jul 19 11:45:27 2019
  InstallationDate: Installed on 2019-05-28 (51 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: bash
  UpgradeStatus: No upgrade log present (probably fresh install)

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