[Libguestfs] [PATCH] fish: edit: write to the real file name

When saving, resolve the path of the file being edited and use that as real target to write to. Otherwise, if the file name is a symlink then it will be replaced by a regular file with the new content, leaving the old file untouched. Extend test-edit.sh to check for this situation. --- fish/file-edit.c | 15 ++++++++++++++- fish/test-edit.sh | 12 +++++++++++- 2 files changed, 25 insertions(+), 2 deletions(-) diff --git a/fish/file-edit.c b/fish/file-edit.c index e6d25f5..dd2272b 100644 --- a/fish/file-edit.c +++ b/fish/file-edit.c @@ -216,11 +216,24 @@ do_download (guestfs_h *g, const char *filename, char **tempfile) } static int -do_upload (guestfs_h *g, const char *filename, const char *tempfile, +do_upload (guestfs_h *g, const char *fn, const char *tempfile, const char *backup_extension) { + CLEANUP_FREE char *filename = NULL; CLEANUP_FREE char *newname = NULL; + /* Resolve the file name and write to the actual target, since + * that is the file it was opened earlier; otherwise, if it is + * a symlink it will be overwritten by a regular file with the + * new content. + * + * Theoretically realpath should work, but just check again + * to be safe. + */ + filename = guestfs_realpath (g, fn); + if (filename == NULL) + return -1; + /* Upload to a new file in the same directory, so if it fails we * don't end up with a partially written file. Give the new file * a completely random name so we have only a tiny chance of diff --git a/fish/test-edit.sh b/fish/test-edit.sh index 34bfc9d..9d7ab9d 100755 --- a/fish/test-edit.sh +++ b/fish/test-edit.sh @@ -43,6 +43,12 @@ cat /file.txt stat /file.txt | grep mode: stat /file.txt | grep uid: stat /file.txt | grep gid: +echo ========== +write /file-2.txt "symlink test\n" +ln-s /file-2.txt /symlink-2.txt +edit /symlink-2.txt +is-symlink /symlink-2.txt +cat /symlink-2.txt EOF ) @@ -51,7 +57,11 @@ second line of text mode: 33152 uid: 10 -gid: 11" ]; then +gid: 11 +========== +true +symlink test +second line of text" ]; then echo "$0: error: output of guestfish after edit command did not match expected output" echo "$output" exit 1 -- 1.9.3