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Edit File: texhash

#!/bin/sh
# original mktexlsr -- create or rebuild ls-R.
# 
# (If you change or delete the word `original' on the previous line,
# installation won't write this script over yours.)
#
# Suitable for calling from cron, as in:
# 0 * * * * cd /your/texmf/root && /usr/local/texlive/bin/mktexlsr
# 
# Originally written as `texhash' by Thomas Esser, Okt., 1994.
# Public domain.

version='$Id: mktexlsr 56842 2020-11-02 23:00:54Z karl $'
progname=`echo $0 | sed 's%.*/%%'`

usage="Usage: $progname [OPTION]... [DIR]...

Rebuild ls-R filename databases used by TeX.  If one or more arguments
DIRS are given, these are used as the directories in which to build
ls-R. Else all directories in the search path for ls-R files
(\$TEXMFDBS) are used.

Options:
  --dry-run  do not actually update anything
  --help     display this help and exit 
  --quiet    cancel --verbose
  --silent   same as --quiet
  --verbose  explain what is being done
  --version  output version information and exit
  
If standard input is a terminal, --verbose is on by default.

For more information, see the \`Filename database' section of
Kpathsea manual available at http://tug.org/kpathsea.

Report bugs to: tex-k@tug.org
TeX Live home page: <http://tug.org/texlive/>
"

# The simple PATH-prepending approach we take in other scripts doesn't
# handle DOS/Windows, but we don't use the shell scripts on Windows
# anyway, and does anyone want current TL on DOS or DJGPP?  Maybe they
# can maintain their own changes if so.  Leaving this code though, since
# it's always been here ...

# MS-DOS and MS-Windows define $COMSPEC or $ComSpec and use `;' to separate
# directories in path lists whereas Unix uses `:'.  Make an exception for
# Cygwin, which pretends to be UNIX.
# Create a variable that holds the right character to be used by the scripts.
DOSISH=no
case `uname -s` in
  CYGWIN*|Cygwin*|cygwin*) ;;
  *) if test -n "$COMSPEC" || test -n "$ComSpec"; then DOSISH=yes; fi
esac
if test "$DOSISH" = "no"; then SEP=':'; else SEP=';';fi

# Add the location of the script to the PATH if necessary.  This must
# be done before kpsewhich can be called, and thus cannot be put into
# mktex.opt.
dirname=`echo $0 | sed 's%/*[^/][^/]*$%%'`
case $dirname in
  "") # Do nothing
      ;;
  /* | [A-z]:/*) # Absolute name
      PATH="$dirname$SEP$PATH"
      export PATH ;;
   *)  # Relative name
      PATH="`pwd`/$dirname$SEP$PATH"
      export PATH ;;
esac

if tty -s >/dev/null 2>&1; then verbose=true; else verbose=false; fi
dry_run=false
trees=

# initialize treefile by either mktemp or some random name
# code taken from pdfjam and adjusted
{
  treefile=`
    (umask 077 && mktemp "${TMPDIR-/tmp}/mktexlsrtrees.XXXXXXXXXX") 2>/dev/null
  ` && test -n "$treefile" && test -f "$treefile"
} || {
  ##  We'll use awk to make random number, for portability
  random=`awk 'END { srand(); printf ("%d\n", rand()*1000000); }' /dev/null`
  treefile="${TMPDIR-/tmp}/mktexlsrtrees$$.$random"
} || exit $?

trap 'cd /; rm -f $treefile; test -z "$db_dir_tmp" || rm -rf "$db_dir_tmp"; 
      exit' 0 1 2 3 7 13 15

# A copy of some stuff from mktex.opt, so we can run in the presence of
# terminally damaged ls-R files.
while test $# -gt 0; do
  if test "x$1" = x--help || test "x$1" = x-help; then
    echo "$usage"
    exit 0
  elif test "x$1" = x--version || test "x$1" = x-version; then
    echo "`basename $0` $version"
    kpsewhich --version
    exit 0
  elif test "x$1" = x--verbose || test "x$1" = x-verbose; then
    verbose=true
  elif test "x$1" = x--dry-run || test "x$1" = x-n; then
    dry_run=true
  elif test "x$1" = x--quiet || test "x$1" = x--silent \
       || test "x$1" = x-quiet || test "x$1" = x-silent ; then
    verbose=false
  elif test "x$1" = x--; then
    :
  elif echo "x$1" | grep '^x-' >/dev/null; then
    echo "$progname: unknown option \`$1', try --help if you need it." >&2
    exit 1
  else
    if test ! -d "$1"; then
      echo "$progname: $1: not a directory, skipping." >&2
      shift
      continue
    fi
    # By saving the argument in a file, we can later get it back while
    # supporting spaces in the name.  This still doesn't support
    # newlines in the directory names, but nobody ever complains about
    # that, and it seems much too much trouble to use \0 terminators.
    (umask 077
    if echo "$1" >>"$treefile"; then :; else
      echo "$progname: $treefile: could not append to arg file, goodbye." >&2
      exit 1
    fi
    )
  fi
  shift
done

# mktexupd and mktexlsr make sure they're coordinated via this.  A copy
# is found mktex.opt.
ls_R_magic='% ls-R -- filename database for kpathsea; do not change this line.'
# The old string, which should continue to work.
old_ls_R_magic='% ls-R -- maintained by MakeTeXls-R; do not change this line.'

{
  # Get list of directories from the explicit arguments (now saved in
  # $treefile), or $TEXMFDBS if no explicit args.  Eliminate duplicates.
  saveIFS=$IFS  # break only at newline
  IFS='
'
  if test -s "$treefile"; then
    set x `sort "$treefile" | uniq`
  else
    set x `kpsewhich --show-path=ls-R | tr : '
' | sort | uniq`
  fi
  IFS=$saveIFS
  shift
}

for TEXMFLS_R in "$@"; do
  # Prepend cwd if the directory was relative.
  case "$TEXMFLS_R" in
  "") continue ;;  # Strictly speaking, it is an error if this case is taken.
  /* | [A-z]:/*) ;;
  *)  TEXMFLS_R="`pwd`/$TEXMFLS_R"
  esac
  # Allow for either ls-R and ls-r to exist.  But create ls-R if we're
  # working from scratch.
  if test -f "$TEXMFLS_R/ls-R"; then
    db_file="$TEXMFLS_R/ls-R"
  elif test -f "$TEXMFLS_R/ls-r"; then
    db_file="$TEXMFLS_R/ls-r"
  else
    db_file="$TEXMFLS_R/ls-R"
  fi
  # Follow a possible symlink to get the right filesystem. 
  # The '|| true' construct prevents an sh -e aborting.
  db_readlink=`kpsereadlink "$TEXMFLS_R/ls-R" 2>/dev/null` || true
  case "$db_readlink" in
  "") ;;
  /* | [A-z]:/*) db_file="$db_readlink" ;;
  *)  db_file="$TEXMFLS_R/$db_readlink"
  esac
  db_dir=`echo "$db_file" | sed 's%/[^/][^/]*$%%'` # can't rely on dirname

# want to be silent if the directory doesn't exist, since the ls-R
  # path ordinarily contains many nonexistent directories.
  test -d "$db_dir" || continue
  test -w "$db_dir" || { echo "$progname: $db_dir: directory not writable. Skipping..." >&2; continue; }

if test ! -f "$db_file"; then
    cp /dev/null "$db_file"
    # Use same permissions as parent directory, minus x,s, or t bits.
    chmod `kpsestat -xst "$db_dir"` "$db_file"
  elif test -s "$db_file" \
       && test "x$(sed '1s/
$//;1q' "$db_file")" != "x$ls_R_magic" \
       && test "x$(sed '1s/
$//;1q' "$db_file")" != "x$old_ls_R_magic"; then
    echo "$progname: $db_file: no magic string, skipping..." >&2
    continue
  fi

# Skip if we cannot write the file:
  kpseaccess -w "$db_file" || { echo "$progname: $db_file: no write permission, skipping..." >&2; continue; }

db_dir_tmp="$db_dir/lsR$$.tmp"
  (umask 077 && mkdir "$db_dir_tmp" ) \
    || { echo "$progname: $db_dir_tmp: could not create directory, skipping..." >&2; continue; }
  db_file_tmp="$db_dir_tmp/lsR$$.tmp"
  rm -f "$db_file_tmp"

$verbose && echo "$progname: Updating $db_file... "
  $dry_run && continue
  
  echo "$ls_R_magic" >"$db_file_tmp"

# The main task. We put ./: in the output, so top-level files can be
  # found via ls-R. Probably irrelevant in practice.  The sed command
  # inserts the leading ./ for directory names, and removes ., .., and
  # version control entries from the list.  Also omit contents of any
  # the version directories; sed apparently requires that we do that
  # operation in a separate invocation.  We do not try to support colons
  # in directory names.
  # 
  echo "./:" >>"$db_file_tmp"
  vc_dirs='\.$bzr\|git\|hg\|svn$\|_darcs'
  (cd "$TEXMFLS_R" && \ls -LRa 2>/dev/null) \
   | sed -e '/^$/{n;s%^\./%%;s%^%./%;}; /^\.$/d; /^\.\.$/d; /^'$vc_dirs'$/d;' \
         -e '/^[\.\/]*lsR[0-9]*\.tmp:*$/d' \
   | sed -e /$vc_dirs'.*:$/,/^$/d' \
   >>"$db_file_tmp"

# To be really safe, a loop.
  until PERMS=`kpsestat = "$db_file"`; do sleep 1; done
  chmod $PERMS "$db_file_tmp"
  rm -f "$db_file"
  mv "$db_file_tmp" "$db_file"
  rm -rf "$db_dir_tmp"
done

$verbose && echo "$progname: Done."
exit 0

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