J'écris un script qui est appelé lorsqu'un utilisateur se connecte et vérifie si un certain dossier existe ou s'il s'agit d'un lien symbolique cassé. (C'est sur un système Mac OS X, mais la question est purement bash).
Ce n'est pas élégant et cela ne fonctionne pas, mais en ce moment, cela ressemble à ceci:
#!/bin/bash
# Often users have a messed up cache folder -- one that was redirected
# but now is just a broken symlink. This script checks to see if
# the cache folder is all right, and if not, deletes it
# so that the system can recreate it.
USERNAME=$3
if [ "$USERNAME" == "" ] ; then
echo "This script must be run at login!" >&2
exit 1
fi
DIR="~$USERNAME/Library/Caches"
cd $DIR || rm $DIR && echo "Removed misdirected Cache folder" && exit 0
echo "Cache folder was fine."Le nœud du problème est que l'expansion du tilde ne fonctionne pas comme je le voudrais.
Disons que j'ai un utilisateur nommé georgeet que son dossier de départ est /a/path/to/georges_home. Si, sur un shell, je tape:
cd ~georgecela m'amène au répertoire approprié. Si je tape:
HOME_DIR=~george
echo $HOME_DIRÇa me donne:
/a/path/to/georges_homeCependant, si j'essaie d'utiliser une variable, cela ne fonctionne pas:
USERNAME="george"
cd ~$USERNAME
-bash: cd: ~george: No such file or directoryJ'ai essayé d'utiliser des guillemets et des astuces, mais je n'arrive pas à comprendre comment le développer correctement. Comment faire pour que ça marche?
Addenda
Je voulais juste publier mon script terminé (vraiment, ce n'est pas aussi moche que le travail en cours ci-dessus!) Et dire qu'il semble fonctionner correctement.
#!/bin/bash
# Often users have a messed up cache folder -- one that was redirected
# but now is just a broken symlink. This script checks to see if
# the cache folder is all right, and if not, deletes it
# so that the system can recreate it.
#set -x # turn on to help debug
USERNAME=$3 # Casper passes the user name as parameter 3
if [ "$USERNAME" == "" ] ; then
echo "This script must be run at login!" >&2
exit 1 # bail out, indicating failure
fi
CACHEDIR=`echo $(eval echo ~$USERNAME/Library/Caches)`
# Show what we've got
ls -ldF "$CACHEDIR"
if [ -d "$CACHEDIR" ] ; then
# The cache folder either exists or is a working symlink
# It doesn't really matter, but might as well output a message stating which
if [ -L "$CACHEDIR" ] ; then
echo "Working symlink found at $CACHEDIR was not removed."
else
echo "Normal directory found at $CACHEDIR was left untouched."
fi
else
# We almost certainly have a broken symlink instead of the directory
if [ -L "$CACHEDIR" ] ; then
echo "Removing broken symlink at $CACHEDIR."
rm "$CACHEDIR"
else
echo "Abnormality found at $CACHEDIR. Trying to remove." >&2
rm -rf "$CACHEDIR"
exit 2 # mark this as a bad attempt to fix things; it isn't clear if the fix worked
fi
fi
# exit, indicating that the script ran successfully,
# and that the Cache folder is (almost certainly) now in a good state
exit 0