100 lines
2.0 KiB
Bash
Executable File
100 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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#
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# Find out the maximum supported filename length and print it.
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#
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# Part of the gocryptfs test suite
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# https://nuetzlich.net/gocryptfs/
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set -eu
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MYNAME=$(basename "$0")
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if [[ $# -ne 1 || $1 == -* ]]; then
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echo "Usage: $MYNAME DIRECTORY"
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exit 1
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fi
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# Only show live progress if connected to a termial
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# https://stackoverflow.com/a/911213/1380267
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INTERACTIVE=0
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if [[ -t 1 ]] ; then
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INTERACTIVE=1
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fi
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cd "$1"
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echo "Testing $PWD"
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echo -n " Maximum filename length: "
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# Add one character at a time until we hit an error
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NAME=""
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while true ; do
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NEXT="${NAME}x"
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if [[ -e $NEXT ]]; then
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echo "error: file $PWD/$NEXT already exists"
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exit 1
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fi
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echo -n 2> /dev/null > "$NEXT" || break
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rm "$NEXT"
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NAME="$NEXT"
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done
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echo "${#NAME}"
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# Set to 0 if undefined
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: ${QUICK:=0}
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if [[ $QUICK -ne 1 ]]; then
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echo -n " Maximum dirname length: "
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# Add one character at a time until we hit an error
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NAME=""
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while true ; do
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NEXT="${NAME}x"
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mkdir "$NEXT" 2> /dev/null || break
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rmdir "$NEXT"
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NAME="$NEXT"
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done
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MAX_DIRNAME=${#NAME}
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echo "${#NAME}"
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fi
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if [[ $QUICK -eq 1 ]]; then
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CHARS_TODO=100
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else
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CHARS_TODO="1 10 100 $MAX_DIRNAME"
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fi
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for CHARS_PER_SUBDIR in $CHARS_TODO ; do
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echo -n " Maximum path length with $(printf %3d $CHARS_PER_SUBDIR) chars per subdir: "
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if [[ $INTERACTIVE -eq 1 ]] ; then
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echo -n " "
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fi
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# Trick from https://stackoverflow.com/a/5349842/1380267
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SUBDIR=$(printf 'x%.0s' $(seq 1 $CHARS_PER_SUBDIR))
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mkdir "$SUBDIR"
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P=$SUBDIR
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# Create a deep path, one $SUBDIR at a time, until we hit an error
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while true ; do
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NEXT="$P/$SUBDIR"
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mkdir "$NEXT" 2> /dev/null || break
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P=$NEXT
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if [[ $INTERACTIVE -eq 1 ]] ; then
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echo -n -e "\b\b\b\b"
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printf %4d ${#P}
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fi
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done
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# Then add one character at a time until we hit an error
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NAME=""
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while true ; do
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NEXT="${NAME}x"
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touch "$P/$NEXT" 2> /dev/null || break
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NAME=$NEXT
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done
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if [[ $NAME != "" ]] ; then
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P=$P/$NAME
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fi
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if [[ $INTERACTIVE -eq 1 ]] ; then
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echo -n -e "\b\b\b\b"
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fi
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printf %4d ${#P}
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echo
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rm -R "$SUBDIR"
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done
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